US20010004517A1 - Medicinal or dental hand instrument - Google Patents
Medicinal or dental hand instrument Download PDFInfo
- Publication number
- US20010004517A1 US20010004517A1 US09/770,957 US77095701A US2001004517A1 US 20010004517 A1 US20010004517 A1 US 20010004517A1 US 77095701 A US77095701 A US 77095701A US 2001004517 A1 US2001004517 A1 US 2001004517A1
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- US
- United States
- Prior art keywords
- hand
- hand instrument
- coupling
- handle
- instrument
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000008878 coupling Effects 0.000 claims abstract description 94
- 238000010168 coupling process Methods 0.000 claims abstract description 94
- 238000005859 coupling reaction Methods 0.000 claims abstract description 94
- 239000003814 drug Substances 0.000 claims abstract description 28
- 229940124597 therapeutic agent Drugs 0.000 claims abstract description 28
- 239000012530 fluid Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000003860 storage Methods 0.000 claims description 33
- 239000000843 powder Substances 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 16
- 239000008187 granular material Substances 0.000 claims description 11
- 230000001225 therapeutic effect Effects 0.000 claims description 7
- 230000035515 penetration Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 230000001154 acute effect Effects 0.000 claims description 2
- 239000003086 colorant Substances 0.000 claims description 2
- 230000003179 granulation Effects 0.000 claims 1
- 238000005469 granulation Methods 0.000 claims 1
- 239000003082 abrasive agent Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 6
- 206010061876 Obstruction Diseases 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 4
- 238000011109 contamination Methods 0.000 description 4
- 210000003811 finger Anatomy 0.000 description 4
- 229910052731 fluorine Inorganic materials 0.000 description 4
- 239000011737 fluorine Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 210000003813 thumb Anatomy 0.000 description 2
- 244000248349 Citrus limon Species 0.000 description 1
- 235000005979 Citrus limon Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 210000001847 jaw Anatomy 0.000 description 1
- 210000004874 lower jaw Anatomy 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 229910052939 potassium sulfate Inorganic materials 0.000 description 1
- 239000001120 potassium sulphate Substances 0.000 description 1
- 235000011151 potassium sulphates Nutrition 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 230000003019 stabilising effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C3/00—Dental tools or instruments
- A61C3/02—Tooth drilling or cutting instruments; Instruments acting like a sandblast machine
- A61C3/025—Instruments acting like a sandblast machine, e.g. for cleaning, polishing or cutting teeth
Definitions
- the invention relates to a medicinal or dental hand instrument according to the preamble of claim 1 , 17 , 20 or 21 .
- a common feature of these known hand instruments is a rod-shaped hand piece which in its front end zone has an outlet nozzle for a therapeutic agent and at its rear end has a coupling terminal for the detachable coupling of the hand piece to a flexible supply line. From the coupling terminal one or more feed lines for the therapeutic agent extend through the hand piece to the outlet terminal.
- the hand piece described in U.S. Pat. No. 2,814,877 comprises a storage container for the therapeutic agent at its rear end.
- the coupling terminal for the supply line is arranged at the rear end of the storage container, the feed line extending coaxially through the container.
- the hand piece is a body permanently assembled from a plurality of longitudinal parts.
- a valve is arranged in the feed line, said valve being selectively manually opened or closed by a transversely projecting actuating element.
- the outlet opening is situated at the front end of a hollow needle which projects from the hand piece and whose free end extends obliquely forwards relative to the longitudinal central axis of the hand instrument.
- a known hand instrument somewhat comparable with the previously described known hand instrument has been described in IT 1180538.
- this hand instrument likewise comprises a storage chamber for the therapeutic agent, a first and second centrifugal chamber for the therapeutic agent being arranged in the front half of the hand piece.
- a dental hand instrument described in U.S. Pat. No. 4,648,840 comprises a laterally projecting storage container which is arranged in the rear end zone of the hand instrument.
- a hand instrument of the present type has to fulfil i.a. two requirements. On the one hand, it is to be easy to handle in order to be able to be moved and guided purposively and safely during use with the least possible exertion. On the other hand, a simple construction which can be manufactured cost-effectively is advisable, which in particular is of essential significance in view of the relatively small structural space available.
- the feed line between the coupling component associated with the supply line and the coupling component associated with the hand instrument and the ongoing feed line are complex and the manufacture of these feed line sections requires a relatively large outlay in terms of production and time, with the result that the manufacturing costs are also high.
- the object of the invention is, in the case of a hand instrument of the type described in the preamble of claim 1 , to simplify and improve upon the coupling means for coupling to the supply line.
- the associated coupling component and one or more coaxially or paraxially disposed, sealed pipe socket couplings are formed on a separate insert piece which can be premanufactured and assembled simply and cost-effectively.
- the hand piece can have a substantially simpler construction in the region of the coupling terminal. The reason for this is that the production of the feed line formed on the one hand in the separate insert piece and on the other hand in the hand instrument with the insert piece removed, thereby providing improved accessibility, is simpler and easier. This is also contributed towards by the design of the one or more pipe socket coupling(s) present between the insert piece and the hand piece, which can be produced and sealed in a simple manner and facilitate a small construction.
- This embodiment according to the invention also allows the insert piece to be used as adapter for adapting the hand instrument to different coupling components associated with the supply line, when a plurality of insert pieces matching coupling components produced by different manufacturers are provided. This allows a simple adaptation of the hand instrument to different manufacturers of supply lines or devices, which adaptation can be carried out with ease of handling and both rapidly and cost-effectively.
- the handle with an optionally provided hollow needle, can be rotated simply and with ease of handling independently of the rearwardly arranged shaft, and the outlet opening can be brought into selective positions. This substantially simplifies a purposive treatment of the teeth of a jaw, or of the lower- and upper jaw.
- the coupling terminal laterally on the hand instrument.
- the effective lever load exerted upon the hand instrument by the flexible supply line during the handling of the hand instrument can be substantially reduced.
- the effective load gravity point of the flexible supply line is displaced towards the hand instrument.
- the effective distance between the coupling terminal and the handle can be substantially reduced, so that the stabilisation moment to be applied by the operator's hand during the handling of the hand instrument is also substantially reduced in this way.
- the advantageous outcome is that the operator can move and guide the hand instrument more simply, more easily and with less attentiveness. Consequently the operator can concentrate more upon the actual treatment with the result that an improvement in the quality of the treatment can also be achieved.
- the coatings or discolourations present on body parts, in particular teeth, can be of different types and consistencies.
- a plurality of therapeutic agents having different removing capacities can selectively be used.
- different coatings and/or discolourations can be treated with a therapeutic agent having a greater or lesser removing capacity, on the one hand with the correct power level and on the other hand gently and thus purposively, e.g. using a therapeutic agent having a fine, medium or coarse removing capacity.
- a therapeutic agent having a fine, medium or coarse removing capacity e.g. using a therapeutic agent having a fine, medium or coarse removing capacity.
- the inlet opening for the transport fluid and the inner outlet opening for the mixture are situated in the central region of the accommodating chamber of the storage container. In this way these openings are situated an a region of the accommodating chamber in which, independently of the position of the hand instrument, a substantially uniform mixture quantity and concentration can discharge through the inner outlet opening.
- a substantially uniform mixture quantity and concentration can discharge through the inner outlet opening.
- the invention further relates to an advantageous pressure relief device for the storage container which facilitates a clean opening of the storage container even when the latter is under pressure, for example in the case of an obstruction in the region of the hand instrument.
- FIG. 1 is a vertical longitudinal section through a medicinal, or in particular dental, hand instrument according to the invention
- FIG. 2 is a vertical longitudinal section through a hollow needle of the hand instrument
- FIG. 3 is the section III-III of FIG. 1;
- FIG. 4 is a plan view of the detail referenced X in FIG. 1.
- the main components of the hand instrument 1 comprise a rod-shaped hand piece 2 , a storage container 3 for a powdery, abrasive therapeutic agent arranged in the rear zone of the hand instrument 1 , a coupling terminal 4 for the detachable coupling of the hand instrument 1 to a flexible supply line of a dentist's chair or the like, an outlet opening 5 in the front end zone of the hand instrument 1 , and feed lines which extend from the coupling terminal 4 through the hand instrument 1 to the outlet opening 5 .
- the hand piece 2 consists of a front hand piece member, which forms a handle 6 , and a rear hand piece member which forms a shaft 7 which extends rearwardly from the handle 6 and at its rear end bears the storage container 3 and on which the coupling terminal 4 is arranged laterally.
- the handle 6 and the shaft 7 are sleeve-like bodies in whose cavity 8 , which preferably has a circular cross-section, one or more feed lines extend from the coupling terminal 4 to the outlet opening 5 .
- two feed lines 9 , 11 are provided, namely one for a pressure gas, in particular compressed air, and one for a therapeutic liquid, in particular water.
- the feed line sections 9 a , 11 a extending in the region of the lateral coupling terminal 4 lead into ongoing line sections—and here into the cavity 8 —in the rear end zone and in a line coupling 9 c , 11 c forwardly offset in relation to the storage container 3 .
- the feed line sections 9 a , 11 a preferably converge obliquely forwards into a sleeve thickened portion on which a connecting socket 12 is formed, in particular in the predetermined oblique position, which forms an acute angle W, here approximately 40° to 60°, in particular approximately 45° to 55°, with the longitudinal central axis 10 of the hand piece 2 .
- the hand instrument 1 is used for example to clean coatings, in particular on teeth, by means of a powdery, particle-containing flow discharged under pressure from the nozzle or outlet opening 5 , as will be described further. If small hard granules, e.g. abrasive or corundum granules, are used as abrasive agent in the flow, the hand instrument is also suitable for the removal of relatively harder tissue, such as dental enamel, for example for rounding off sharp edges or adapting levels.
- relatively harder tissue such as dental enamel
- filler materials or metals of crowns or inlays can also be removed.
- the coupling terminal 4 forms part of a screw coupling or preferably a plug-in/rotary coupling 13 , by means of which the coupling terminal 4 can be detachably coupled to the flexible supply line (not shown) rapidly and with ease of handling.
- the plug-in/rotary coupling 13 comprises a cylindrical coupling pin and a cylindrical coupling recess 14 which accommodates said pin; in the present embodiment the coupling pin (only sketched in the drawing) projects from a terminal component of the flexible supply line and the coupling recess 14 is arranged in the connecting socket 12 .
- the media lines extending in the flexible supply line extend in the form of axially parallel channels into the region of the coupling pin 14 a , passing through the hollow-cylindrical separating gap between coupling pin 14 a and coupling recess 14 b in a Z-formation at penetration points.
- an annular groove 15 is arranged either in the outer surface of the coupling pin 14 a or in the inner surface of the coupling recess 14 b , while on both sides of the penetration point a sealing ring 16 is in each case arranged in the annular groove of the coupling pin 14 a or the coupling recess 14 b for sealing purposes.
- the coupling pin 14 a and coupling recess 14 b can be stepped in forwardly converging fashion, as shown in FIG. 1, in which case the line connection points can be provided, axially offset, in each step.
- the coupling recess 14 b is arranged in a cylindrical insert piece 17 which at its front end comprises for example two diametrally opposed, projecting pipe sockets 17 , 18 through which the feed line sections 9 a , 11 a extend and which can be inserted into a corresponding plug-in recess 19 from which extend channels 21 . 22 which accommodate the pipe sockets 17 , 18 .
- annular seals 23 can be provided which are in each case arranged in annular grooves of the outer surface of the pipe sockets 17 , 18 or in the inner surface of the channels 21 , 22 .
- the insert piece 20 is retained by a retaining nut 24 detachably screwed onto the connecting socket 12 .
- a locking device 25 is provided comprising a flexible locking element 25 a which can be flexibly located in a locking recess either in the coupling pin 14 a or in the coupling recess 14 b and to which excess pressure can be applied in order to release the plug-in/rotary coupling 13 .
- the outlet opening 5 is arranged at the free end of a hollow needle 27 which extends rectilinearly or laterally obliquely or transversely and whose free end forms a right angle or obtuse angle W 1 with the longitudinal central axis 10 of the hand instrument 1 .
- the hollow needle 27 is formed by an outer pipe 27 a whose rear end is fixed to a hollow-cylindrical needle base 27 b which can be detachably connected to the front end of the handle 6 by a fast-acting connection, here a bayonet connection 31 .
- the bayonet connection 31 comprises, in a manner known per se, a locking pin, here formed by a radial pin 29 on the hollow needle base 24 b , which can be introduced into a bayonet groove of the handle 6 by the insertion and rotation of the hollow needle 27 and which preferably also can be locked in a locking recess, thereby preventing it from being unintentionally turned backwards.
- a plug-in recess 32 of cylindrical or stepped-cylindrical formation accommodating the hollow needle base 27 b is provided in an accommodating sleeve 33 fixed in the sleeve-like handle 6 , for example by pressing or gluing.
- an inner pipe 34 and an outer pipe 35 are arranged in a rear, stepped bore in a stable and tightly sealed manner, the inner pipe 34 extending coaxially into the central region of the accommodating chamber 36 of the storage container 3 .
- the outer pipe 35 which surrounds the inner pipe 34 with an annular gap, extends up to a cylindrical connecting member 37 in which a line connection is provided between the line section 9 b and the annular channel between inner pipe and outer pipe 35 , which channel forms an ongoing line section 11 b .
- the connecting member is adapted to the cross-sectional dimensions of the cavity 8 and prevented from being axially displaced therein by suitable fixing measures, e.g. gluing or a locking transverse pin or a locking transverse screw.
- the connecting member 37 comprises a radial connecting hole 38 which extends inwards into a front stepped hole 39 into which the rear end of the outer pipe 35 extends and is sealed therein, for example by impression.
- an annular groove 40 is provided in the outer surface of the connecting member 37 and a plurality of connecting holes 38 can also be distributed over the periphery.
- the connecting member 37 is sealed in the cavity 8 by a respective sealing ring 41 which is arranged in an associated annular groove in the outer surface of the connecting member 37 or in the inner surface of the cavity 8 .
- the connecting member 37 can also be axially secured by being held so as to be axially undisplaceable in the accommodating sleeve 33 by means of the outer pipe 35 .
- the feed line 11 passes around the free end of the hollow needle base 27 b .
- a plurality of transverse holes 45 or an associated annular groove 46 can be provided in the outer surface of the hollow needle base 27 b or in the inner surface of the plug-in recess 32 , annular seals 47 positioned in annular grooves in the hollow needle base 47 b or in the accommodating sleeve 33 being arranged on both sides.
- the outer pipe 27 a of the hollow needle 27 contains an inner pipe 51 whose outer cross-sectional dimensions are smaller than the inner cross-sectional dimensions of the outer pipe 27 a , so that a gap 52 exists between the latter and the inner pipe 51 .
- this gap 52 is an annular gap. This is not necessary however, as the inner pipe 51 can bear against the outer pipe 27 a on one side.
- the inner pipe 51 extends into the free end zone of the outer pipe 27 a and can terminate with the latter or be set back or forwards somewhat in relation to the latter, as shown.
- the free end zone of the inner pipe 51 is held in a preferably convergent cap 53 which is screwed to the facing end of the outer pipe 27 a , in particular is screwed-in with a thread attachment 54 .
- the cap 53 surrounds the inner pipe 51 at a distance comparable with the small gap 52 . To homogenise the outflow, it is advantageous to form a gap enlargement 52 a at the free end of the gap 52 .
- the cross-section of the threaded pipe 51 is advantageous to taper the cross-section of the threaded pipe 51 at a distance a before its free end.
- the cross-section of the inner pipe 51 is reduced in size and the flow- and outlet speed of the through-flowing medium, here water, is increased, thereby contributing towards the efficiency of the abrasive treatment and also improving the mixing of the media with the abrasive agent.
- the cross-sectional tapering 55 is preferably not to be stepped but gradual or conical in order to avoid an edge likely to result in obstructions.
- its inner cross-section is somewhat larger, whereby the risk of obstruction is reduced.
- the distance a amounts to approximately 5 to 10 mm.
- the gap 52 continues in the region of the hollow needle base 27 b to the rear of the transverse hole 45 , while a longitudinal hole 30 accommodating the outer pipe 27 a has corresponding dimensions, being optionally stepped.
- the rear end of the inner pipe 51 is tightly connected to the rear end of the hollow needle base 27 b , for example is impressed therein or soldered thereto, when the hollow needle base 27 b and inner pipe 51 consist of metal.
- the rear end of the inner pipe 51 is somewhat thickened in its end region and impressed into the longitudinal hole 30 or a stepped enlargement thereof, thereby ensuring sealing tightness.
- a preferably sleeve-like sealing ring 56 is provided which is positioned in the base of the plug-in recess 32 , the front end of the inner pipe 34 preferably projecting into the hole of the sealing ring 45 which is adapted to the outer cross-section of the inner pipe 34 .
- the length of the sealing ring 56 is made somewhat larger than the distance between the inner pipes 34 and 51 or between the inner pipe 34 and the hollow needle base 27 b .
- the sealing ring 56 therefore consists of elastically compressible material, such as rubber or plastics for example.
- the storage container 3 forms the rear end of the hand instrument 1 , being arranged coaxially with the hand piece 2 and having a hat-like cover 61 which can be screwed to a flat or ring-shaped container base 63 by a screw thread 62 disposed in its free edge zone.
- the container base 63 is cup-shaped, whereby the accommodating chamber 64 of the storage container 3 is enlarged.
- the cover 61 preferably consists of transparent material, e.g. glass, quartz or plastics.
- the inner pipe 34 passes through the connecting member 37 in the stepped hole 39 , being accommodated in the rear section of the stepped hole 39 in tightly sealed fashion. That part of the cavity 8 situated behind the connecting member 37 is closed off from the accommodating chamber 64 by a sleeve 65 which surrounds the inner pipe 34 with an annular gap 66 , the inner pipe 34 extending up to or into an inner shoulder 67 in the rear end zone of the sleeve 65 .
- the annular gap 66 represents a rearwardly directed extension of the cavity 8 .
- the sleeve 65 is inserted or screwed into the hole formed by the cavity 8 in tightly sealed fashion.
- the cross-section of the sleeve 65 is made smaller than the cross-section of the cavity 8 , and the sleeve 65 has a flange 68 with an outer thread 69 which is screwed into an inner thread of the cavity 8 .
- the flange 68 itself, or a support ring 71 inserted therein, holds the rear end zone of the inner pipe 37 in the axial position.
- the support ring 71 comprises a longitudinally directed perforation or through-holes 72 to ensure the passage of air into the annular gap 66 .
- the sleeve 65 contains a plurality of transverse holes 73 which connect the annular gap 66 to the accommodating chamber 64 .
- transverse holes 73 In the longitudinal direction of the central axis 10 are arranged a plurality of—here in each case three—transverse holes 73 , of which the or a central hole extends approximately radially and the or a front hole and the or a rear hole diverge obliquely outwards.
- the transverse holes 73 can also be distributed over the periphery.
- the sleeve 65 has at least one axial inlet hole 74 which is arranged coaxially with the free inner cross-section of the inner pipe 34 .
- the inlet hole 74 is preceded by a disc 75 which forms radial access holes 74 a .
- the disc forms part of a nut which is screwed into a corresponding threaded recess at the rear end of the sleeve 65 .
- the handle 6 and the shaft 7 are mounted together in a pivot bearing 78 so as to be rotatable in relation to one another about the longitudinal central axis 10 , at the same time being held axially together by a connecting device 79 .
- the pivot bearing 78 is formed by a suitable over-engagement of the sleeve bodies of handle 6 and shaft 7 .
- the handle 6 comprises a sleeve attachment 81 which projects coaxially from its rear end and is preferably tapered and is surrounded by a projecting sleeve casing 82 of the shaft 7 with a small movement play.
- the connecting device 79 is formed by a locking device 83 with at least one radial, outwardly directed locking nose 84 on a locking arm 85 rearwardly projecting from the sleeve attachment 81 , where the locking nose 84 engages behind a locking edge on the inside of the sleeve attachment 82 .
- the locking arm 85 On the rear the locking arm 85 has a convergent lead-in surface 86 which upon insertion causes the elastic locking arms 85 to bend inwards automatically.
- the sleeve attachment 82 preferably converges forwards and is provided with a conical outer surface 87 a , merging into the outer surface 87 of the handle 6 in an approximately closing manner. To improve the stability of grip, the outer surface 87 is provided with a grip structure.
- annular shafts 88 and annular recesses are provided in the longitudinal direction, these preferably being rounded and merging into one another at only slightly inclined annular flank surfaces.
- the outer surface 87 b comprises three grip surfaces 89 uniformly distributed over the periphery which permit an advantageous three-point holding of the handle 6 between three fingers of the operator's hand, while the shaft 7 can rest on the central region of the hand, in particular between the index finger and the thumb.
- the bearing point in the shaft 7 is situated in the vicinity of the connecting socket 12 .
- the rotatability of the handle 6 allows the position of the hollow needle 27 to be adapted to the respective treatment location. For its rotation, the handle 6 merely requires to be rotated by the fingers by which it is gripped, with co-rotation of the hollow needle 27 .
- the shaft 7 now rests on the base area between the index finger and the thumb of the back of the hand. Due to the weight of the flexible supply line, the shaft 7 can remain in its respective rotary position upon the rotation of the handle 6 .
- the therapeutic liquid in the feed line 11 and the compressed air in the feed line 9 can simultaneously flow through the rotary/plug-in coupling into the hand piece 2 , where the compressed air firstly flows rearwards through the annular gap 66 and out of the transverse holes 72 , preferably in distributed fashion, into the accommodating chamber 64 and centrifuges the abrasive agent contained therein, e.g. sodium bicarbonate or potassium sulphate in powder form.
- the abrasive agent contained therein e.g. sodium bicarbonate or potassium sulphate in powder form.
- the resultant air/powder mixture flows through the inlet hole 74 or, if a disc 75 is provided, through the access holes 74 a and the inlet hole 74 into the inner sleeve 34 and on to the outlet opening 5 , where it is mixed with the water and forms an abrasive flow for the removal of coatings from teeth and the like.
- the previously described supply of the media can be triggered by a suitable switch.
- a foot-operated switch is provided which electrically actuates corresponding opening valves of a control device for the media.
- a non-return valve 91 whose valve body, preferably a valve ball, blocks a backwards flow in the feed line section 11 a .
- other hand instruments 1 e.g. turbines, which can likewise be coupled by the plug-in/rotary coupling 13 , are protected from contamination and damage by the abrasive agent.
- the abrasive material could enter the region of the plug-in/rotary coupling 13 , for example by virtue of its own weight, after the switching off of the hand instrument 1 or in the event of the following malfunction.
- the non-returning valve 91 is arranged in the region of the base of a front-end stepped bore 91 a into which a sleeve, in each case forming the pipe sockets 17 , 18 , is in each case permanently inserted at a distance from the step which accommodates the non-return valve 91 .
- the storage container 3 comprises a special pressure relief device 92 which ensures the relief of pressure before the storage container 3 is opened, here before the cover 61 is removed.
- the pressure relief device 92 contains a recess 96 which, upon the unscrewing of the cover 61 , forms a small passage for the pressurized compressed air through which the latter can be discharged before the cover is disengaged from the threading. Hardly any powder escapes during this pressure relief, in particular when the cover 61 is opened with the hand instrument in a position in which the thus formed outlet opening faces upwards and the powder is present on the base of the cover.
- the recess is formed by one or more flattened portions 97 distributed over the periphery which are arranged on the circular outer surface 98 of an annular attachment 99 which comprises the outer thread and which in its free edge zone cooperates with the sealing ring 94 .
- the at least one flattened portion 97 only requires to be arranged in the free edge zone of the annular attachment. However, it can also extend over the entire length of the annular attachment 99 , in which case the thread is likewise flattened.
- the abrasive agent consists of a material which dissolves in moisture or water and thus can be flushed relatively easily out of the treatment location, here the mouth cavity of the patient.
- a pleasant flavouring e.g. lemon or orange flavouring
- a powder with a granule size of between approximately 15 ⁇ m and 125 ⁇ m is particularly suitable for the removal and cleaning of coatings on teeth.
- the coating or soiling or discolouration on the teeth can differ in thickness or consistency, it is advantageous to assign a plurality of types of powder having different removal capacities and abrasive power to the hand instrument 1 , in each case in a storage container. It is also advantageous to make available powders in a plurality of different granule sizes or ranges, such as coarse, medium and fine, or coarse and fine, in storage containers.
- the powder for coarse work can have a granule size of 60 ⁇ m to 100 ⁇ m while the powder for fine work can have a granule size of between 15 ⁇ m and 50 ⁇ m.
- the latter granule size is suitable both for fine work on sensitive teeth and also for the polishing of teeth.
- the hand instrument 1 a plurality of hollow needles 27 or hollow needle heads 53 , all of which are suitable for mounting on the hand piece 2 or the hollow needle 27 respectively but which differ in respect of their shape and/or size or in respect of the size of their outlet opening 5 .
- the hand instrument can also be adapted to difficult treatment locations.
- different sized hollow needles 27 or different sized outlet openings 5 it is possible to influence the effectiveness of the therapeutic flow issuing from the outlet opening 5 and thus to define the power level for the purposive execution of coarse or more fine work.
- hollow needles 27 with a different size of outlet opening 5 are suitable for powders with different granule sizes or different removing capacities.
- the hollow needles or hollow needle heads 53 are provided with a corresponding mark which indicates the association of the matching powder.
- this mark is a coloured mark of the same colour as the associated powder.
- a plurality of different sized outlet- and/or inlet nozzles here formed by the at least one outlet hole 73 and/or inlet hole 74 , for the carrier air flow and/or for the mixture of air and abrasive agent, which can be interchanged in accordance with the desired granule size of the powder.
- a set of parts comprising a hollow needle 27 and an outlet- and/or inlet nozzle, here the sleeve-shaped nozzle carrier 15 , can be adapted to one another in respect of the through-openings.
- the insert piece 20 , the hollow needle 21 , the accommodating sleeve 33 , the connecting member 37 , the inner pipe and outer pipe 34 , 35 , the sleeve 65 , and optionally also the disc 75 are composed of in particular hard metal, preferably steel, thereby avoiding premature wear of these parts.
- the handle 6 and/or shaft 7 and/or cover 61 and storage container 3 consist of metal, plastics material or preferably glass. These materials can also be produced simply and cost-effectively even in the case of a difficult construction and are insensitive to disinfectant- and sterilising agents. Also, no electrostatic charge exists, in particular in the case of glass.
- the interior 8 of the hand piece 2 is connected by a line connection 101 to the feed line 9 for the compressed air. The air pressure can thus propagate into the interior, optionally also escaping from the crevices or gaps, and prevent the penetration of the aforementioned contaminating material.
- the rearwardly extending feed line section namely the rear part of the interior 8
- the front part of the interior B is connected to the front part of the interior B by a through-hole 102 in the connecting member 37 .
- no contaminating material can penetrate either into the crevices of the pivot bearing 78 or in the region of the connecting device 31 .
Abstract
In a medicinal or dental hand instrument (1) comprising a hand piece (2) and a handle (6) arranged on the hand piece (2), an outlet opening (5), arranged on the front side of the handle (6), for the outlet of an abrasive therapeutic agent and a transport fluid, and a coupling terminal (4) for coupling the hand instrument (1) to a supply line for at least one transport fluid, in particular water and/or air, wherein the coupling terminal (4) is a coupling component (14 b) of a coupling (13), the coupling component (14 b) is arranged on an insert piece (20) which can be plugged into a plug-in socket or plug-in recess (19) and in its end zone, facing away from the flow, has one or more coaxially or paraxially disposed, sealed pipe socket couplings (10), which each connect a feed line (9, 11) for the transport fluid to an ongoing feed line (21, 22).
Description
- The invention relates to a medicinal or dental hand instrument according to the preamble of
claim 1, 17, 20 or 21. - A hand instrument of this type has been described in each of publications U.S. Pat. No. 2,814,877, IT 1180538 and U.S. Pat. No. 4,648,840.
- A common feature of these known hand instruments is a rod-shaped hand piece which in its front end zone has an outlet nozzle for a therapeutic agent and at its rear end has a coupling terminal for the detachable coupling of the hand piece to a flexible supply line. From the coupling terminal one or more feed lines for the therapeutic agent extend through the hand piece to the outlet terminal.
- The hand piece described in U.S. Pat. No. 2,814,877 comprises a storage container for the therapeutic agent at its rear end. The coupling terminal for the supply line is arranged at the rear end of the storage container, the feed line extending coaxially through the container. The hand piece is a body permanently assembled from a plurality of longitudinal parts. In the front end zone of the hand piece a valve is arranged in the feed line, said valve being selectively manually opened or closed by a transversely projecting actuating element. The outlet opening is situated at the front end of a hollow needle which projects from the hand piece and whose free end extends obliquely forwards relative to the longitudinal central axis of the hand instrument.
- A known hand instrument somewhat comparable with the previously described known hand instrument has been described in IT 1180538. In its rear end zone this hand instrument likewise comprises a storage chamber for the therapeutic agent, a first and second centrifugal chamber for the therapeutic agent being arranged in the front half of the hand piece.
- In contrast to the previously described modes of construction, a dental hand instrument described in U.S. Pat. No. 4,648,840 comprises a laterally projecting storage container which is arranged in the rear end zone of the hand instrument.
- A hand instrument of the present type has to fulfil i.a. two requirements. On the one hand, it is to be easy to handle in order to be able to be moved and guided purposively and safely during use with the least possible exertion. On the other hand, a simple construction which can be manufactured cost-effectively is advisable, which in particular is of essential significance in view of the relatively small structural space available. Here it should be kept in mind that the feed line between the coupling component associated with the supply line and the coupling component associated with the hand instrument and the ongoing feed line are complex and the manufacture of these feed line sections requires a relatively large outlay in terms of production and time, with the result that the manufacturing costs are also high.
- The object of the invention is, in the case of a hand instrument of the type described in the preamble of claim1, to simplify and improve upon the coupling means for coupling to the supply line.
- This object is achieved by the features of claim1.
- In this embodiment the associated coupling component and one or more coaxially or paraxially disposed, sealed pipe socket couplings are formed on a separate insert piece which can be premanufactured and assembled simply and cost-effectively. The hand piece can have a substantially simpler construction in the region of the coupling terminal. The reason for this is that the production of the feed line formed on the one hand in the separate insert piece and on the other hand in the hand instrument with the insert piece removed, thereby providing improved accessibility, is simpler and easier. This is also contributed towards by the design of the one or more pipe socket coupling(s) present between the insert piece and the hand piece, which can be produced and sealed in a simple manner and facilitate a small construction.
- This embodiment according to the invention also allows the insert piece to be used as adapter for adapting the hand instrument to different coupling components associated with the supply line, when a plurality of insert pieces matching coupling components produced by different manufacturers are provided. This allows a simple adaptation of the hand instrument to different manufacturers of supply lines or devices, which adaptation can be carried out with ease of handling and both rapidly and cost-effectively.
- It is a further object of the invention to design a medicinal or dental hand instrument of the type described in the preamble of claim17 so as to facilitate simpler and improved handling.
- This object is achieved by the features of claim17.
- In this embodiment according to the invention, the handle, with an optionally provided hollow needle, can be rotated simply and with ease of handling independently of the rearwardly arranged shaft, and the outlet opening can be brought into selective positions. This substantially simplifies a purposive treatment of the teeth of a jaw, or of the lower- and upper jaw.
- It is also advantageous to arrange the coupling terminal laterally on the hand instrument. In this way the effective lever load exerted upon the hand instrument by the flexible supply line during the handling of the hand instrument can be substantially reduced. This is due to the fact that on the one hand, on account of the lateral coupling terminal, the effective load gravity point of the flexible supply line is displaced towards the hand instrument. On the other hand, the effective distance between the coupling terminal and the handle can be substantially reduced, so that the stabilisation moment to be applied by the operator's hand during the handling of the hand instrument is also substantially reduced in this way. The advantageous outcome is that the operator can move and guide the hand instrument more simply, more easily and with less attentiveness. Consequently the operator can concentrate more upon the actual treatment with the result that an improvement in the quality of the treatment can also be achieved.
- The coatings or discolourations present on body parts, in particular teeth, can be of different types and consistencies.
- Therefore it is a further object of the invention to design a hand instrument of the type described in the preamble of
claim 20 and/or 21 in such manner that the respective body part can be purposively treated and/or the hand instrument can be adapted to the particular treatment required. - This object is achieved by the features of
claim 20 and/or 21. - In accordance with
claim 20, a plurality of therapeutic agents having different removing capacities can selectively be used. In this way different coatings and/or discolourations can be treated with a therapeutic agent having a greater or lesser removing capacity, on the one hand with the correct power level and on the other hand gently and thus purposively, e.g. using a therapeutic agent having a fine, medium or coarse removing capacity. Here it should be kept in mind that, in particular in the case of treatment with a coarse-acting therapeutic agent, depending upon the aggressiveness of the therapeutic agent a slight erosion of tooth substance is likely. This can be avoided or reduced to a minimum by means of the invention. - Further developments of these features of the invention facilitate a simple and easily handled adaptation of the therapeutic instrument to different therapeutic agents, and at the same time the selection of the implementation of the adaptation is simplified and facilitated.
- It is a further object of the invention to protect the interior of the hand piece from contamination.
- This object is achieved by the features of
claim 24. - In the embodiment according to
claim 24, in functional operation the interior of the hand piece is subjected to excess pressure which prevents impurities and pathogenic organisms from penetrating through crevices and gaps. - It is a further object of the invention to design a hand instrument of the type described in the preamble of claim25 in such manner that contamination of the coupling is prevented.
- This object is achieved by the features of claim25.
- In this embodiment an automatic closure of the feed line in the direction of the coupling takes place. In this way, in the event of an obstruction of the hand instrument, pressure relief noises and contamination upon the opening of the coupling are avoided.
- It is a further object of the invention to design a hand instrument of the type described in the preamble of
claim 27 in such manner that, independently of the position of the hand instrument, a substantially uniform mixture of the carrier fluid and the abrasive therapeutic agent is obtained. - This object is fulfilled by the features of
claim 27. In this embodiment the inlet opening for the transport fluid and the inner outlet opening for the mixture are situated in the central region of the accommodating chamber of the storage container. In this way these openings are situated an a region of the accommodating chamber in which, independently of the position of the hand instrument, a substantially uniform mixture quantity and concentration can discharge through the inner outlet opening. This is of considerable advantage as during the treatment the hand instrument can be held in different positions in particular in the mouth cavity of a patient, and nevertheless a substantially constant mixture is outlet from the outlet opening of the handle. - The invention further relates to an advantageous pressure relief device for the storage container which facilitates a clean opening of the storage container even when the latter is under pressure, for example in the case of an obstruction in the region of the hand instrument.
- In the following the invention and further advantages attainable by means of the invention will be explained in detail making reference to simplified drawings and advantageous exemplary embodiments. In the drawings:
- FIG. 1 is a vertical longitudinal section through a medicinal, or in particular dental, hand instrument according to the invention;
- FIG. 2 is a vertical longitudinal section through a hollow needle of the hand instrument;
- FIG. 3 is the section III-III of FIG. 1;
- FIG. 4 is a plan view of the detail referenced X in FIG. 1.
- The main components of the hand instrument1 comprise a rod-shaped
hand piece 2, astorage container 3 for a powdery, abrasive therapeutic agent arranged in the rear zone of the hand instrument 1, a coupling terminal 4 for the detachable coupling of the hand instrument 1 to a flexible supply line of a dentist's chair or the like, an outlet opening 5 in the front end zone of the hand instrument 1, and feed lines which extend from the coupling terminal 4 through the hand instrument 1 to the outlet opening 5. - In the present, preferred embodiment, the
hand piece 2 consists of a front hand piece member, which forms ahandle 6, and a rear hand piece member which forms ashaft 7 which extends rearwardly from thehandle 6 and at its rear end bears thestorage container 3 and on which the coupling terminal 4 is arranged laterally. - The
handle 6 and theshaft 7 are sleeve-like bodies in whosecavity 8, which preferably has a circular cross-section, one or more feed lines extend from the coupling terminal 4 to the outlet opening 5. - In the present embodiment two
feed lines 9, 11 are provided, namely one for a pressure gas, in particular compressed air, and one for a therapeutic liquid, in particular water. The feed line sections 9 a, 11 a extending in the region of the lateral coupling terminal 4 lead into ongoing line sections—and here into thecavity 8—in the rear end zone and in aline coupling 9 c, 11 c forwardly offset in relation to thestorage container 3. Here the feed line sections 9 a, 11 a preferably converge obliquely forwards into a sleeve thickened portion on which a connectingsocket 12 is formed, in particular in the predetermined oblique position, which forms an acute angle W, here approximately 40° to 60°, in particular approximately 45° to 55°, with the longitudinalcentral axis 10 of thehand piece 2. - The hand instrument1 is used for example to clean coatings, in particular on teeth, by means of a powdery, particle-containing flow discharged under pressure from the nozzle or outlet opening 5, as will be described further. If small hard granules, e.g. abrasive or corundum granules, are used as abrasive agent in the flow, the hand instrument is also suitable for the removal of relatively harder tissue, such as dental enamel, for example for rounding off sharp edges or adapting levels. Here, depending upon the hardness of the granules, filler materials or metals of crowns or inlays can also be removed.
- The coupling terminal4 forms part of a screw coupling or preferably a plug-in/
rotary coupling 13, by means of which the coupling terminal 4 can be detachably coupled to the flexible supply line (not shown) rapidly and with ease of handling. The plug-in/rotary coupling 13 comprises a cylindrical coupling pin and a cylindrical coupling recess 14 which accommodates said pin; in the present embodiment the coupling pin (only sketched in the drawing) projects from a terminal component of the flexible supply line and the coupling recess 14 is arranged in the connectingsocket 12. - The media lines extending in the flexible supply line, here for water and air, extend in the form of axially parallel channels into the region of the coupling pin14 a, passing through the hollow-cylindrical separating gap between coupling pin 14 a and coupling recess 14 b in a Z-formation at penetration points. At each penetration point an
annular groove 15 is arranged either in the outer surface of the coupling pin 14 a or in the inner surface of the coupling recess 14 b, while on both sides of the penetration point a sealing ring 16 is in each case arranged in the annular groove of the coupling pin 14 a or the coupling recess 14 b for sealing purposes. The coupling pin 14 a and coupling recess 14 b can be stepped in forwardly converging fashion, as shown in FIG. 1, in which case the line connection points can be provided, axially offset, in each step. - In the present embodiment the coupling recess14 b is arranged in a cylindrical insert piece 17 which at its front end comprises for example two diametrally opposed, projecting
pipe sockets 17, 18 through which the feed line sections 9 a, 11 a extend and which can be inserted into a corresponding plug-inrecess 19 from which extend channels 21. 22 which accommodate thepipe sockets 17, 18. For sealing, annular seals 23 can be provided which are in each case arranged in annular grooves of the outer surface of thepipe sockets 17, 18 or in the inner surface of thechannels 21, 22. Theinsert piece 20 is retained by a retainingnut 24 detachably screwed onto the connectingsocket 12. - For the detachable fixing of the plug-in/
rotary coupling 13, a locking device 25 is provided comprising a flexible locking element 25 a which can be flexibly located in a locking recess either in the coupling pin 14 a or in the coupling recess 14 b and to which excess pressure can be applied in order to release the plug-in/rotary coupling 13. - In the present embodiment, the outlet opening5 is arranged at the free end of a
hollow needle 27 which extends rectilinearly or laterally obliquely or transversely and whose free end forms a right angle or obtuse angle W 1 with the longitudinalcentral axis 10 of the hand instrument 1. Thehollow needle 27 is formed by anouter pipe 27 a whose rear end is fixed to a hollow-cylindrical needle base 27 b which can be detachably connected to the front end of thehandle 6 by a fast-acting connection, here a bayonet connection 31. The bayonet connection 31 comprises, in a manner known per se, a locking pin, here formed by aradial pin 29 on the hollow needle base 24 b, which can be introduced into a bayonet groove of thehandle 6 by the insertion and rotation of thehollow needle 27 and which preferably also can be locked in a locking recess, thereby preventing it from being unintentionally turned backwards. - In the present embodiment, a plug-in
recess 32 of cylindrical or stepped-cylindrical formation accommodating thehollow needle base 27 b is provided in anaccommodating sleeve 33 fixed in the sleeve-like handle 6, for example by pressing or gluing. In theaccommodating sleeve 33 aninner pipe 34 and anouter pipe 35 are arranged in a rear, stepped bore in a stable and tightly sealed manner, theinner pipe 34 extending coaxially into the central region of the accommodating chamber 36 of thestorage container 3. Theouter pipe 35, which surrounds theinner pipe 34 with an annular gap, extends up to a cylindrical connectingmember 37 in which a line connection is provided between the line section 9 b and the annular channel between inner pipe andouter pipe 35, which channel forms anongoing line section 11 b. The connecting member is adapted to the cross-sectional dimensions of thecavity 8 and prevented from being axially displaced therein by suitable fixing measures, e.g. gluing or a locking transverse pin or a locking transverse screw. At the inlet of the line section 11 a, the connectingmember 37 comprises aradial connecting hole 38 which extends inwards into a front steppedhole 39 into which the rear end of theouter pipe 35 extends and is sealed therein, for example by impression. Preferably, in the transverse plane of the connectinghole 38 anannular groove 40 is provided in the outer surface of the connectingmember 37 and a plurality of connectingholes 38 can also be distributed over the periphery. On both sides of the connectinghole 38 the connectingmember 37 is sealed in thecavity 8 by arespective sealing ring 41 which is arranged in an associated annular groove in the outer surface of the connectingmember 37 or in the inner surface of thecavity 8. The connectingmember 37 can also be axially secured by being held so as to be axially undisplaceable in theaccommodating sleeve 33 by means of theouter pipe 35. - In the region of the
accommodating sleeve 33 the feed line 11 passes around the free end of thehollow needle base 27 b. This takes place in that from a rear steppedhole 42 in theaccommodating sleeve 33, which hole accommodates theouter pipe 35, one or more radial channels 43 distributed over the periphery lead(s) into a longitudinal channel 44 a which extends approximately paraxially in theaccommodating sleeve 33 and leads to thehollow needle base 27 b and is connected to the cavity of theouter pipe 27 a by a transverse channel 44 b in theaccommodating sleeve 33 and atransverse channel 45, connected thereto, in thehollow needle base 27 b. Here again a plurality oftransverse holes 45 or an associatedannular groove 46 can be provided in the outer surface of thehollow needle base 27 b or in the inner surface of the plug-inrecess 32,annular seals 47 positioned in annular grooves in the hollow needle base 47 b or in theaccommodating sleeve 33 being arranged on both sides. - The
outer pipe 27 a of thehollow needle 27 contains aninner pipe 51 whose outer cross-sectional dimensions are smaller than the inner cross-sectional dimensions of theouter pipe 27 a, so that agap 52 exists between the latter and theinner pipe 51. When theinner pipe 51 extends coaxially in theouter pipe 27 a, thisgap 52 is an annular gap. This is not necessary however, as theinner pipe 51 can bear against theouter pipe 27 a on one side. Theinner pipe 51 extends into the free end zone of theouter pipe 27 a and can terminate with the latter or be set back or forwards somewhat in relation to the latter, as shown. In the present embodiment the free end zone of theinner pipe 51 is held in a preferablyconvergent cap 53 which is screwed to the facing end of theouter pipe 27 a, in particular is screwed-in with athread attachment 54. - The
cap 53 surrounds theinner pipe 51 at a distance comparable with thesmall gap 52. To homogenise the outflow, it is advantageous to form a gap enlargement 52 a at the free end of thegap 52. - It is advantageous to taper the cross-section of the threaded
pipe 51 at a distance a before its free end. In this way the cross-section of theinner pipe 51 is reduced in size and the flow- and outlet speed of the through-flowing medium, here water, is increased, thereby contributing towards the efficiency of the abrasive treatment and also improving the mixing of the media with the abrasive agent. Thecross-sectional tapering 55 is preferably not to be stepped but gradual or conical in order to avoid an edge likely to result in obstructions. In the remainder of theinner pipe 51, its inner cross-section is somewhat larger, whereby the risk of obstruction is reduced. In the present embodiment, the distance a amounts to approximately 5 to 10 mm. - The
gap 52 continues in the region of thehollow needle base 27 b to the rear of thetransverse hole 45, while alongitudinal hole 30 accommodating theouter pipe 27 a has corresponding dimensions, being optionally stepped. The rear end of theinner pipe 51 is tightly connected to the rear end of thehollow needle base 27 b, for example is impressed therein or soldered thereto, when thehollow needle base 27 b andinner pipe 51 consist of metal. In the present embodiment the rear end of theinner pipe 51 is somewhat thickened in its end region and impressed into thelongitudinal hole 30 or a stepped enlargement thereof, thereby ensuring sealing tightness. - To seal the rear end of the
hollow needle base 27 b and the front end of theinner pipe 34, a preferably sleeve-like sealing ring 56 is provided which is positioned in the base of the plug-inrecess 32, the front end of theinner pipe 34 preferably projecting into the hole of the sealingring 45 which is adapted to the outer cross-section of theinner pipe 34. The length of the sealingring 56 is made somewhat larger than the distance between theinner pipes inner pipe 34 and thehollow needle base 27 b. Consequently the sealingring 56 is axially compressed upon the mounting of thehollow needle 27, here with the bayonet connection, with the result that the sealing tightness of this sealing device, bearing thegeneral reference 57, is ensured. The sealingring 56 therefore consists of elastically compressible material, such as rubber or plastics for example. - The
storage container 3 forms the rear end of the hand instrument 1, being arranged coaxially with thehand piece 2 and having a hat-like cover 61 which can be screwed to a flat or ring-shapedcontainer base 63 by ascrew thread 62 disposed in its free edge zone. Preferably thecontainer base 63 is cup-shaped, whereby theaccommodating chamber 64 of thestorage container 3 is enlarged. Thecover 61 preferably consists of transparent material, e.g. glass, quartz or plastics. - The
inner pipe 34 passes through the connectingmember 37 in the steppedhole 39, being accommodated in the rear section of the steppedhole 39 in tightly sealed fashion. That part of thecavity 8 situated behind the connectingmember 37 is closed off from theaccommodating chamber 64 by a sleeve 65 which surrounds theinner pipe 34 with anannular gap 66, theinner pipe 34 extending up to or into aninner shoulder 67 in the rear end zone of the sleeve 65. Theannular gap 66 represents a rearwardly directed extension of thecavity 8. The sleeve 65 is inserted or screwed into the hole formed by thecavity 8 in tightly sealed fashion. In the present embodiment the cross-section of the sleeve 65 is made smaller than the cross-section of thecavity 8, and the sleeve 65 has aflange 68 with anouter thread 69 which is screwed into an inner thread of thecavity 8. Theflange 68 itself, or asupport ring 71 inserted therein, holds the rear end zone of theinner pipe 37 in the axial position. Thesupport ring 71 comprises a longitudinally directed perforation or through-holes 72 to ensure the passage of air into theannular gap 66. In a preferably central position relative to theaccommodating chamber 64, the sleeve 65 contains a plurality oftransverse holes 73 which connect theannular gap 66 to theaccommodating chamber 64. In the longitudinal direction of thecentral axis 10 are arranged a plurality of—here in each case three—transverse holes 73, of which the or a central hole extends approximately radially and the or a front hole and the or a rear hole diverge obliquely outwards. Thetransverse holes 73 can also be distributed over the periphery. - At its free end positioned approximately in the central zone of the
accommodating chamber 64, the sleeve 65 has at least one axial inlet hole 74 which is arranged coaxially with the free inner cross-section of theinner pipe 34. In the present embodiment the inlet hole 74 is preceded by adisc 75 which forms radial access holes 74 a. In the present embodiment the disc forms part of a nut which is screwed into a corresponding threaded recess at the rear end of the sleeve 65. - The
handle 6 and theshaft 7 are mounted together in a pivot bearing 78 so as to be rotatable in relation to one another about the longitudinalcentral axis 10, at the same time being held axially together by a connecting device 79. Thepivot bearing 78 is formed by a suitable over-engagement of the sleeve bodies ofhandle 6 andshaft 7. In the present embodiment thehandle 6 comprises asleeve attachment 81 which projects coaxially from its rear end and is preferably tapered and is surrounded by a projectingsleeve casing 82 of theshaft 7 with a small movement play. The connecting device 79 is formed by a locking device 83 with at least one radial, outwardly directed locking nose 84 on a locking arm 85 rearwardly projecting from thesleeve attachment 81, where the locking nose 84 engages behind a locking edge on the inside of thesleeve attachment 82. On the rear the locking arm 85 has a convergent lead-insurface 86 which upon insertion causes the elastic locking arms 85 to bend inwards automatically. Thesleeve attachment 82 preferably converges forwards and is provided with a conical outer surface 87 a, merging into theouter surface 87 of thehandle 6 in an approximately closing manner. To improve the stability of grip, theouter surface 87 is provided with a grip structure. In the present embodiment, alternatingannular shafts 88 and annular recesses are provided in the longitudinal direction, these preferably being rounded and merging into one another at only slightly inclined annular flank surfaces. To further improve the stability of grip, theouter surface 87 b comprises threegrip surfaces 89 uniformly distributed over the periphery which permit an advantageous three-point holding of thehandle 6 between three fingers of the operator's hand, while theshaft 7 can rest on the central region of the hand, in particular between the index finger and the thumb. The bearing point in theshaft 7 is situated in the vicinity of the connectingsocket 12. - The rotatability of the
handle 6 allows the position of thehollow needle 27 to be adapted to the respective treatment location. For its rotation, thehandle 6 merely requires to be rotated by the fingers by which it is gripped, with co-rotation of thehollow needle 27. Theshaft 7 now rests on the base area between the index finger and the thumb of the back of the hand. Due to the weight of the flexible supply line, theshaft 7 can remain in its respective rotary position upon the rotation of thehandle 6. - In functional operation the therapeutic liquid in the feed line11 and the compressed air in the
feed line 9 can simultaneously flow through the rotary/plug-in coupling into thehand piece 2, where the compressed air firstly flows rearwards through theannular gap 66 and out of thetransverse holes 72, preferably in distributed fashion, into theaccommodating chamber 64 and centrifuges the abrasive agent contained therein, e.g. sodium bicarbonate or potassium sulphate in powder form. The resultant air/powder mixture flows through the inlet hole 74 or, if adisc 75 is provided, through the access holes 74 a and the inlet hole 74 into theinner sleeve 34 and on to the outlet opening 5, where it is mixed with the water and forms an abrasive flow for the removal of coatings from teeth and the like. The previously described supply of the media can be triggered by a suitable switch. In the present embodiment a foot-operated switch is provided which electrically actuates corresponding opening valves of a control device for the media. - To prevent the abrasive material from passing into the region of the plug-in/
rotary coupling 13, in the feed line section 9 a there is arranged anon-return valve 91 whose valve body, preferably a valve ball, blocks a backwards flow in the feed line section 11 a. In this way, other hand instruments 1, e.g. turbines, which can likewise be coupled by the plug-in/rotary coupling 13, are protected from contamination and damage by the abrasive agent. - Without the previously described blocking means, the abrasive material could enter the region of the plug-in/
rotary coupling 13, for example by virtue of its own weight, after the switching off of the hand instrument 1 or in the event of the following malfunction. - In the event of an obstruction in the air/powder mixture feed line, e.g. in the region of the
hollow needle 27, the arising air pressure builds up in the cavities of the hand instrument 1 traversed by the compressed air. In this pressure state it is unfavourable to open the plug-in/rotary coupling 13 or thestorage container 3 since upon opening, the accumulated pressure present in the cavities of the hand instrument 1 is discharged, which is particularly unfavourable in the case of thestorage container 8 since powder particles are entrained with the discharge, which is undesirable. - Preferably the
non-returning valve 91 is arranged in the region of the base of a front-end stepped bore 91 a into which a sleeve, in each case forming thepipe sockets 17, 18, is in each case permanently inserted at a distance from the step which accommodates thenon-return valve 91. - The
storage container 3 comprises a specialpressure relief device 92 which ensures the relief of pressure before thestorage container 3 is opened, here before thecover 61 is removed. In the sealing surface 95 which cooperates with the sealingring 94, thepressure relief device 92 contains a recess 96 which, upon the unscrewing of thecover 61, forms a small passage for the pressurized compressed air through which the latter can be discharged before the cover is disengaged from the threading. Hardly any powder escapes during this pressure relief, in particular when thecover 61 is opened with the hand instrument in a position in which the thus formed outlet opening faces upwards and the powder is present on the base of the cover. In the present embodiment the recess is formed by one or more flattened portions 97 distributed over the periphery which are arranged on the circular outer surface 98 of anannular attachment 99 which comprises the outer thread and which in its free edge zone cooperates with the sealingring 94. The at least one flattened portion 97 only requires to be arranged in the free edge zone of the annular attachment. However, it can also extend over the entire length of theannular attachment 99, in which case the thread is likewise flattened. - The abrasive agent consists of a material which dissolves in moisture or water and thus can be flushed relatively easily out of the treatment location, here the mouth cavity of the patient. To improve the taste it is advantageous to admix a pleasant flavouring, e.g. lemon or orange flavouring, to the abrasive agent or powder.
- A powder with a granule size of between approximately 15 μm and 125 μm is particularly suitable for the removal and cleaning of coatings on teeth.
- As the coating or soiling or discolouration on the teeth can differ in thickness or consistency, it is advantageous to assign a plurality of types of powder having different removal capacities and abrasive power to the hand instrument1, in each case in a storage container. It is also advantageous to make available powders in a plurality of different granule sizes or ranges, such as coarse, medium and fine, or coarse and fine, in storage containers. In the latter case for example the powder for coarse work can have a granule size of 60 μm to 100 μm while the powder for fine work can have a granule size of between 15 μm and 50 μm. The latter granule size is suitable both for fine work on sensitive teeth and also for the polishing of teeth.
- It is also advantageous to assign to the hand instrument1 a plurality of
hollow needles 27 or hollow needle heads 53, all of which are suitable for mounting on thehand piece 2 or thehollow needle 27 respectively but which differ in respect of their shape and/or size or in respect of the size of their outlet opening 5. By selecting and replacing a specific one of differenthollow needles 27 or hollow needle caps or heads 53 of different shapes and/or sizes, the hand instrument can also be adapted to difficult treatment locations. By selecting different sizedhollow needles 27 or different sized outlet openings 5 it is possible to influence the effectiveness of the therapeutic flow issuing from the outlet opening 5 and thus to define the power level for the purposive execution of coarse or more fine work. Additionally,hollow needles 27 with a different size of outlet opening 5 are suitable for powders with different granule sizes or different removing capacities. - In order to be able to differentiate between different types of powders, it is advantageous to produce the powder types in different colours. If a plurality of different
hollow needles 27 or hollow needle heads 53 assigned to specific types of powders are provided, it is advantageous for the hollow needles or hollow needle heads to be provided with a corresponding mark which indicates the association of the matching powder. Preferably this mark is a coloured mark of the same colour as the associated powder. - It is also advantageous to assign to the hand instrument1 a plurality of different sized outlet- and/or inlet nozzles, here formed by the at least one
outlet hole 73 and/or inlet hole 74, for the carrier air flow and/or for the mixture of air and abrasive agent, which can be interchanged in accordance with the desired granule size of the powder. Here preferably a set of parts comprising ahollow needle 27 and an outlet- and/or inlet nozzle, here the sleeve-shapednozzle carrier 15, can be adapted to one another in respect of the through-openings. - In the present exemplary embodiment the
insert piece 20, the hollow needle 21, theaccommodating sleeve 33, the connectingmember 37, the inner pipe andouter pipe disc 75, are composed of in particular hard metal, preferably steel, thereby avoiding premature wear of these parts. Thehandle 6 and/orshaft 7 and/or cover 61 andstorage container 3 consist of metal, plastics material or preferably glass. These materials can also be produced simply and cost-effectively even in the case of a difficult construction and are insensitive to disinfectant- and sterilising agents. Also, no electrostatic charge exists, in particular in the case of glass. - In the operation of a hand instrument1 of the type in question, the risk exists that moisture and/or abrasive material may penetrate through small crevices and gaps in the front region of the
hand piece 2 into the interior of the hand piece, where they can contaminate and damage for example the connecting device 31 for thehollow needle 27 and/or thepivot bearing 78. To avoid this, theinterior 8 of thehand piece 2 is connected by a line connection 101 to thefeed line 9 for the compressed air. The air pressure can thus propagate into the interior, optionally also escaping from the crevices or gaps, and prevent the penetration of the aforementioned contaminating material. In the present embodiment, the rearwardly extending feed line section, namely the rear part of theinterior 8, is connected to the front part of the interior B by a through-hole 102 in the connectingmember 37. In this way, by virtue of the inner pressure, no contaminating material can penetrate either into the crevices of the pivot bearing 78 or in the region of the connecting device 31. - It is advantageous to admix fluorine or a fluorine-containing medium, in particular likewise in powder form, to the abrasive powdery agent. This ensures that during the treatment fluorine penetrates into the tooth surface, hardening and stabilising the latter. Due to the flow speed and resultant impact of the fluorine-containing particles, the influence on the tooth surface is particularly effective.
Claims (31)
1. A medicinal or dental hand instrument (1) comprising
a hand piece (2) and a handle (6) arranged on the hand piece (2),
an outlet opening (5), arranged on the front side of the handle (6), for the outlet of an abrasive therapeutic agent and a transport fluid
and a coupling terminal (4) for coupling the hand instrument (1) to a supply line for at least one transport fluid, in particular water and/or air
wherein the coupling terminal (4) is a coupling component (14 b) of a coupling (13),
wherein the coupling component (14 b) is arranged on an insert piece (20) which can be plugged into a plug-in socket or plug-in recess (19) and which in its end zone facing away from the flow comprises one or more coaxially or paraxially disposed, sealed pipe socket couplings (10), which each connect a feed line (9, 11) for the transport fluid to an ongoing feed line (21, 22).
2. A hand instrument as claimed in , wherein pipe sockets (17, 18) project from the insert piece (20), said pipe sockets in each case extending in an ongoing feed line channel (21, 22).
claim 1
3. A hand instrument as claimed in , wherein the coupling (13) is formed by a plug-in coupling with a plug-in pin (14 a) and a plug-in recess (14 b) which accommodates said pin, the plug-in recess (14 b) being arranged in the insert piece (20) or in the coupling component which forms part of the supply line.
claim 1
4. A hand instrument as claimed in , wherein the feed line or feed lines (9, 11) pass through the separating gap between the coupling pin (14 a) and the component comprising the coupling recess (14 b) in a Z-formation at penetration points, and the penetration points are sealed on both sides by a respective sealing ring (16).
claim 1
5. A hand instrument as claimed in , wherein the coupling terminal (4) is arranged laterally on the hand piece (2).
claim 1
6. A hand instrument as claimed in , wherein the central axis of the coupling terminal and the longitudinal central axis (10) of the hand piece (2) form a right angle or a forwardly directed acute angle (W).
claim 5
7. A hand instrument as claimed in , wherein a plurality of insert pieces (20) are provided which match differently constructed or shaped coupling components associated with the supply line.
claim 1
8. A hand instrument as claimed in , wherein it comprises a storage container (3) for the abrasive therapeutic agent, in particular powder, which is connected to the feed fine (9, 11), the storage container (3) preferably being arranged in the rear region of the hand instrument (1).
claim 1
9. A hand instrument as claimed in , wherein the coupling terminal (4) as a whole, or at least the base region of the coupling terminal (4), is forwardly offset relative to the storage container (3).
claim 8
10. A hand instrument as claimed in , wherein the coupling terminal (4) has two feed lines (9, 11), preferably one for the therapeutic liquid, in particular water, and the other for a gas, in particular air.
claim 1
11. A hand instrument as claimed in , wherein the feed line (9 b) for gas is arranged at the rear of the feed line (11 a) for therapeutic liquid.
claim 10
12. A hand instrument as claimed in , wherein the storage container (3) is arranged at the rear end of the hand piece (2), and in particular coaxially with the handle (6), and preferably forms the rear end.
claim 8
13. A hand instrument as claimed in , wherein the storage container (3) has a detachable cover (61), the separating gap of the cover (61) extending preferably transversely, and in particular at right angles, to the longitudinal central axis (10) of the hand instrument (1).
claim 8
14. A hand instrument as claimed in , wherein a feed line (9) for the transport fluid extends into the storage container (3) with a preferably axial inlet pipe (65), and in particular terminates in the central region of said container.
claim 8
15. A hand instrument as claimed in , wherein a feed line (9) for the transport fluid issues from the storage container (3) with an outlet pipe (34) which projects into the storage container (3), and preferably projects into the central region of said container.
claim 8
16. A hand instrument as claimed in , wherein the inlet pipe (65) preferably extends rearwards from the rear end of the hand piece (2) into the storage container (3) and the outlet pipe (34) is arranged coaxially, and in particular is arranged in the inlet pipe (65).
claim 14
17. A medicinal or dental hand instrument (1) comprising
a hand piece (2) and a handle (6) arranged on the hand piece (2)
an outlet opening (5), arranged on the front side of the handle (6), for the outlet of an abrasive therapeutic agent and a transport fluid
and a coupling terminal (4) for coupling the hand instrument (1) to a supply line for at least one transport fluid, in particular water and/or air
or a hand instrument as claimed in one of the preceding claims,
wherein in its front zone the hand piece (2) has a handle (6) from which the shaft (7) extends rearwards, and that the handle (6) and the shaft (7) are mounted one beside another so as to be freely rotatable about their longitudinal central axis (10).
18. A hand instrument as claimed in , wherein the handle (6) has a rear sleeve attachment (81) and the shaft (7) has a front sleeve attachment (82), the sleeve attachments (81, 82) engaging coaxially over one another with a small movement play, and the sleeve attachment (82) of the shaft (7) preferably engaging over the sleeve attachment (81) of the handle (6).
claim 17
19. A hand instrument as claimed in , wherein the handle (6) and the shaft (7) are held together by a fast-acting connection, preferably a locking connection (83).
claim 17
20. A medicinal or dental hand instrument (1) comprising
a hand piece (2) and a handle (6) arranged on the hand piece (2)
an outlet opening (5), arranged on the front side of the handle (6), for the outlet of an abrasive therapeutic agent and a transport fluid
and a coupling terminal (4) for coupling the hand instrument (1) to a supply line for at least one transport fluid, in particular water and/or air
or a hand instrument as claimed in one of the preceding claims,
wherein the hand instrument (1), together with a plurality of abrasive therapeutic agents having different removing capacities and arranged in storage containers, form a therapeutic device.
21. A medicinal or dental hand instrument (1) comprising
a bland piece (2) and a handle (6) arranged on the hand piece (2)
an outlet opening (5), arranged on the front side of the handle (6), for the outlet of an abrasive therapeutic agent and a transport fluid
and a coupling terminal (4) for coupling the hand instrument (1) to a supply line for at least one transport fluid, in particular water and/or air,
or a hand instrument as claimed in one of the preceding claims,
wherein the outlet opening (5) is arranged in a hollow needle (27) or a hollow needle head (53), which hollow needle or hollow needle head is detachably connected to the hand piece (2) by a fast-acting connection, in particular a bayonet connection, or a screw connection, preferably a plurality of hollow needles (27) or hollow needle heads (53) with different shapes and/or sizes and/or outlet opening sizes (5) being provided so as to be exchangeable.
22. A hand instrument as claimed in , wherein the types of therapeutic agents differ by virtue of a different granule size and preferably three different therapeutic agents are provided for coarse, medium and fine treatment.
claim 20
23. A hand instrument as claimed in one of claims 20, wherein a specified granulation of the therapeutic agent is assigned a specific size of the outlet opening (5) and the hollow needles (27) or hollow needle heads (53) are provided with a mark which identifies the association with the related therapeutic agent, the different types of therapeutic agents preferably having different colours and the hollow needles (27) or hollow needle heads (53) being provided with a mark of the associated, same colour.
24. A medicinal or dental hand instrument (1) comprising
a hand piece (2) and a handle (6) arranged on the hand piece (2)
an outlet opening (5), arranged on the front side of the handle (6), for the outlet of an abrasive therapeutic agent
and a coupling terminal (4) for coupling the hand instrument (1) to a supply line for at least one transport fluid, in particular water and/or air
or a hand instrument (1) as claimed in one of the preceding claims,
wherein the interior (8) of the hand piece (2) is connected by a line connection (101) to the feed line (9) for the gas.
25. A medicinal or dental hand instrument (1) comprising
a hand piece (2) and a handle (6) arranged on the hand piece (2)
an outlet opening (5), arranged on the front side of the handle (6), for the outlet of an abrasive therapeutic agent
and a coupling terminal (4) for coupling the hand instrument (1) to a supply line for at least one transport fluid, in particular water and/or air
or a hand instrument (1) as claimed in one of the preceding claims
wherein a non-return valve (91) is arranged in the feed line (9 a) in a position preceding the coupling terminal (4).
26. A hand instrument as claimed in , wherein the non-return valve (91) is arranged in an insert piece (2) having a coupling component (14 b).
claim 25
27. A medicinal or dental hand instrument (1) comprising
a hand piece (2) and a handle (6) arranged on the hand piece (2)
an outlet opening (5), arranged on the front side of the handle (6), for the outlet of an abrasive therapeutic agent
a coupling terminal (4) for coupling the hand instrument (1) to a supply line for at least one transport fluid, in particular water and/or air and a storage container (3)
into which a feed line (66) with at least one inlet opening (73) leads
and which is connected to the outlet opening (5) provided on the handle (6) by at least one inner outlet opening (74) and a connection line (9)
or a hand instrument as claimed in one of the preceding claims,
wherein the inlet opening (73) and the inner outlet opening (74) are arranged in the central region of the accommodating chamber (64) of the storage container (3).
28. A hand instrument as claimed in , wherein the feed line (66) or the connection line (9) is formed by an annular channel and the respective other line extends coaxially within the annular channel.
claim 27
29. A hand instrument as claimed in , wherein the axial distance between the inlet opening (73) and the outlet opening (74) is small, and in particular is no greater than approximately 30 mm, preferably no greater than approximately 10 mm to 15 mm.
claim 27
30. A hand instrument as claimed in , wherein the inner outlet opening (74) is arranged behind the inlet opening (73).
claim 27
31. A hand instrument as claimed in , wherein the feed line (66) and the connection line (9) are formed by a double sleeve extending into the accommodating chamber (64) of the storage container (3).
claim 27
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/770,957 US6416321B2 (en) | 1996-09-27 | 2001-01-26 | Medicinal or dental hand instrument |
US10/150,421 US6719561B2 (en) | 1996-09-27 | 2002-05-17 | Medicinal or dental hand instrument |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19639871.1 | 1996-09-27 | ||
DE19639871 | 1996-09-27 | ||
DE19639871 | 1996-09-27 | ||
US93614397A | 1997-09-22 | 1997-09-22 | |
US38377699A | 1999-08-26 | 1999-08-26 | |
US09/770,957 US6416321B2 (en) | 1996-09-27 | 2001-01-26 | Medicinal or dental hand instrument |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US38377699A Division | 1996-09-27 | 1999-08-26 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/150,421 Division US6719561B2 (en) | 1996-09-27 | 2002-05-17 | Medicinal or dental hand instrument |
Publications (2)
Publication Number | Publication Date |
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US20010004517A1 true US20010004517A1 (en) | 2001-06-21 |
US6416321B2 US6416321B2 (en) | 2002-07-09 |
Family
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Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/770,957 Expired - Lifetime US6416321B2 (en) | 1996-09-27 | 2001-01-26 | Medicinal or dental hand instrument |
US10/150,421 Expired - Lifetime US6719561B2 (en) | 1996-09-27 | 2002-05-17 | Medicinal or dental hand instrument |
US10/784,677 Abandoned US20040166474A1 (en) | 1996-09-27 | 2004-02-23 | Medicinal or dental hand instrument |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/150,421 Expired - Lifetime US6719561B2 (en) | 1996-09-27 | 2002-05-17 | Medicinal or dental hand instrument |
US10/784,677 Abandoned US20040166474A1 (en) | 1996-09-27 | 2004-02-23 | Medicinal or dental hand instrument |
Country Status (5)
Country | Link |
---|---|
US (3) | US6416321B2 (en) |
EP (3) | EP0834291B1 (en) |
JP (1) | JP3345316B2 (en) |
AT (3) | ATE190824T1 (en) |
DE (4) | DE59709123D1 (en) |
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1997
- 1997-09-25 JP JP26064097A patent/JP3345316B2/en not_active Expired - Fee Related
- 1997-09-26 AT AT97116813T patent/ATE190824T1/en active
- 1997-09-26 DE DE59709123T patent/DE59709123D1/en not_active Expired - Lifetime
- 1997-09-26 EP EP97116813A patent/EP0834291B1/en not_active Expired - Lifetime
- 1997-09-26 EP EP01122742A patent/EP1177774B1/en not_active Expired - Lifetime
- 1997-09-26 DE DE19742701A patent/DE19742701A1/en not_active Withdrawn
- 1997-09-26 DE DE59701302T patent/DE59701302D1/en not_active Expired - Lifetime
- 1997-09-26 AT AT99115976T patent/ATE230583T1/en active
- 1997-09-26 AT AT01122742T patent/ATE283671T1/en active
- 1997-09-26 DE DE59712107T patent/DE59712107D1/en not_active Expired - Lifetime
- 1997-09-26 EP EP99115976A patent/EP0958792B1/en not_active Expired - Lifetime
-
2001
- 2001-01-26 US US09/770,957 patent/US6416321B2/en not_active Expired - Lifetime
-
2002
- 2002-05-17 US US10/150,421 patent/US6719561B2/en not_active Expired - Lifetime
-
2004
- 2004-02-23 US US10/784,677 patent/US20040166474A1/en not_active Abandoned
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US20040123773A1 (en) * | 2002-12-30 | 2004-07-01 | Susan Butler | Ink jet ink with improved reliability |
US6863719B2 (en) | 2002-12-30 | 2005-03-08 | Lexmark International, Inc. | Ink jet ink with improved reliability |
WO2021163688A1 (en) * | 2020-02-14 | 2021-08-19 | Parkell, Inc. | Handpieces for medical and dental devices |
USD1014757S1 (en) | 2021-02-16 | 2024-02-13 | Parkell, Inc. | Dental scaler handpiece |
CN113842235A (en) * | 2021-10-09 | 2021-12-28 | 赵云停 | Dental sandblasting tooth cleaning system |
Also Published As
Publication number | Publication date |
---|---|
JPH10179617A (en) | 1998-07-07 |
EP1177774A3 (en) | 2002-06-12 |
ATE190824T1 (en) | 2000-04-15 |
DE19742701A1 (en) | 1998-04-16 |
US6719561B2 (en) | 2004-04-13 |
EP0834291A3 (en) | 1999-03-10 |
ATE283671T1 (en) | 2004-12-15 |
EP1177774B1 (en) | 2004-12-01 |
EP0958792A1 (en) | 1999-11-24 |
JP3345316B2 (en) | 2002-11-18 |
ATE230583T1 (en) | 2003-01-15 |
EP0958792B1 (en) | 2003-01-08 |
DE59709123D1 (en) | 2003-02-13 |
EP0834291A2 (en) | 1998-04-08 |
US20040166474A1 (en) | 2004-08-26 |
DE59701302D1 (en) | 2000-04-27 |
EP0834291B1 (en) | 2000-03-22 |
DE59712107D1 (en) | 2005-01-05 |
EP1177774A2 (en) | 2002-02-06 |
US6416321B2 (en) | 2002-07-09 |
US20020137006A1 (en) | 2002-09-26 |
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