CA1320669C - Bone plate, particularly small bone plate - Google Patents
Bone plate, particularly small bone plateInfo
- Publication number
- CA1320669C CA1320669C CA000602992A CA602992A CA1320669C CA 1320669 C CA1320669 C CA 1320669C CA 000602992 A CA000602992 A CA 000602992A CA 602992 A CA602992 A CA 602992A CA 1320669 C CA1320669 C CA 1320669C
- Authority
- CA
- Canada
- Prior art keywords
- plate
- gear means
- bone plate
- bone
- guide
- 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.)
- Expired - Fee Related
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
- A61B17/8004—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates with means for distracting or compressing the bone or bones
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
- A61B17/8085—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates with pliable or malleable elements or having a mesh-like structure, e.g. small strips
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S606/00—Surgery
- Y10S606/902—Cortical plate specifically adapted for a particular bone
- Y10S606/906—Small bone plate
Abstract
ABSTRACT
A bone plate, in particular a small bone plate has two plate portions that are longitudinally displaceable relative to each other and include screw holes for bone screws. Gear means between the plate portions adjust the relative position of the plate portions. The plate portions have guide portions longitudinally slidable within a guide member, at least one of the guide portions including a rack. A gear or pinion is rotatably supported within the guide member engaged by the rack and has a tool-engaging surface.
A bone plate, in particular a small bone plate has two plate portions that are longitudinally displaceable relative to each other and include screw holes for bone screws. Gear means between the plate portions adjust the relative position of the plate portions. The plate portions have guide portions longitudinally slidable within a guide member, at least one of the guide portions including a rack. A gear or pinion is rotatably supported within the guide member engaged by the rack and has a tool-engaging surface.
Description
`--` 1 320669 BONE PLATE, PARTICULARLY SMALL BONE PLATE
The invention refers to a bone plate, particularly to a small bone plate having two plate portions longitudinally displaceable relative to each other. Usually bone plates are designed to stabilize fractural segments and to facilitate the growing together of the bone in the fracture area. It îs known to build a bone plate of two parts adapted to follow a change in the length of the bone. A change of length for example may occur by a compression of the fractual segments which for example may be carried out with a specific compression device which is for example k.nown Erom the German patent specifications 29 38 202 or 31 34 120. A change of length can also occur caused by a sin~ering process in the fractural region occurs or with bones o~ adolescent patients. It is for example known to provide two telescopically engaged bone plates with toothed portions in order to adjust a prede-termin~d plate length. It is also known from the German patent specification 31 34 120 to locate gear means between associated plate portions for the compression of fractural bone segments. The gear means is arranged in a housing on a first plate while the output sha~t of the gear means co-operates~with the second plate which can be attached to~
the bone through a bone screw, the bone screw being in-serted through an elongated hole of the first plate. Such compression means may be suitable for fractures of limbs, however, in connection with smaller bone plates, parti-cularly in case of applications wherein a small cover of soft tissue exists, e.g. in the face or the like. the known device is not appropriate.
~ ::
It is also known from the German patent specification ~
35 04 616 to adjust a clamping means by a threaded spindle -relative to a fixedly supported clamping means. Su~h a device can be applied only externally, thus, cannot be .
1 32066C~
applied to the facial skeleton.
Hence the object of the invention is to provide a bone plate which permits an extension or a contraction, respectively, also with smaller bone plates.
The invention provides a bone plate suitable for internal use on a portion o-f a human body where only a small cover of soft tissue exists, said bone plate permitting both extension and contraction and comprising: (a) a first plate portion and a second plate portion longitudinally displaceable relative to each other and including screw holes for bone screws, and (b) gear means located between said first plate portion and said second plate portion and adapted to adjust the relative position of said first plate portion and said second plate portion, and (c~ a guide nlember in the shape of a substantially flat housing, wherein said first plate portion has a first guide por-tion comprising a -first set of parallel legs and said second plate portion has a second guide portion comprising a second set of parallel legs, wherein said firs-t set of parallel legs are telescopically insertable into said second set of parallel legs, wherein said second set of parallel legs have outer edges which are longitudinally slidable within and contact and are guided by said guide member, wherein at least one item selected from the group consisting of said first ~uide portion and said second guide portion includes a rack, wherein said gear means or pinion is rotatably supported within said guide member and is engaged by said rack, and wherein said gear means or pinion has tool-engaging surfaces.
Satisfactorily operating small bone plates are for example known from the German Utility Model 87 96 912. Above all, they are designed for the application to fractures of the cranial and facial skeleton and for small fractural ssgments of other skeleton portions. In the known small bone plates, so-called screw hole boundaries are connected to webs, pre~erably at least a part of the webs having a cross-sectional surEace which is equal to or smaller than twice the cross-sectional surface of the screw hold boundary. The relatively thin pla-tes are so dimensioned that they are adapted to be deforrned by the surgeon in order to conform to the bone in the region of application. It is intended to avoid a noticeable deformation of the screw hole boundaries when the plate is bent in the plane. For this, it is advantageous if the radius of transition from the web to the screw hole boundary is dimensioned to be very small.
The bone pIate according to the invention is particularly suited -for the small bone plate mentioned above, the application of the invention, howevert is not restricted thereto.
Preferably, according to an embodiment of the invention each plate portion has a rack, the racks coacting with diametrically opposed portions of the pinion. By this, the pinion sha~t is not subjected to single acting bendiny forces. The bearing for the gear shaft can be designed to be relatively simple~ A two-rack engagement has the further advantage that the adjustment path can be doubled. Therefore, only a relatively small rotation of the gear leads to a corresponding adjustment path. It is understood tha-t the path length depends on the diameter of the gear.
~) The bone plate according to the in~ention can be designed relatiYely flat so that it can be applied internally and also where only a small covering by soft tissue is existing.
The guide member for example can be designed as relative1y flat housing, the guide channel in the housing having only a depth which is sufficient to receive the gear or the rack portions of the plate portions~ respectively. The tool engaging means for a rotating tool can for example be provided by an inner hexagon of the gear shaft. An adjust-men~ of the bone plate according to the invention can be made at relatively short time intervals without unduly troubling the patient. The bone plate according to the invention is preferably used for extension purposes, e.g.
for osteotomies.
The bone plate according to the invention can be made very small, the guide member may be have a width of 10 mm. Its thickness can be about 3 mm. The plate itself can have only a thickness of about 0,7 mm.
According to a particularly preferred embodiment of the invention the guide portions include two parallel legs, the legs of both guide portions being telescopically in-serted one into the other, the outer edge of the outer ,~ 1 320669 legs being guided by ~he associated internal wall of the guide housiflg. By this, an effective support of the guide portions of the plate portions within the guide housing can be achieved securing that a clamping during a dis-placement due to single acting tension or compression forces is avoided.
The guide member or the guide housing, respectively, accor-ding to a further embodiment of the invention may be pro-vided with a scale, a mark at the gear or the gear shaft, respectively, cooperating with the scale in order to in-dicate the rotational angle or the adjusted path, for example upon an extension.
In order to avoid a backward displacement after an ex-tension or a contra~tion under internally effecting forces suitably set means have to be provided. For example, a set screw can be provided securing the plate portion against the movement relative to each other. Alternatively, the gear shaft or the gear itself can be fixed in each position by a set screw.
!
~ 7 A further modification for securing the gear against ro-tation comprises a gear shaft having an external thread onto which a counternut is screwed adapted to engage the associated surface of the guide member or guide housing, respectively. This nut for example can be formed of a sleeve which for example has hexagonal surfaces on its external surface. The re1easing of the set nut and the rotation of the gear, respectively, requires two different wrench surfaces. For this a combined tool can be used which for example comprises a rod having wrench surfaces for the internal hexagon of the gear shaft which rod being te-lescopically displaceable in a sleeve having a head with internal wrench surfaces. For the removing or the tighte-ning of the counternut the wrench sleeve is slightly slided beyond the wrench rod for engagement with the counternut. The wrench rod itself engages the internal hexagon of the gear shaft. After the counternut is re-lieved, a corresponding rotation can be carried out by the wrench rod.
It is preferred to recognize the angle of rotation since this angle o~ rotation is proportional to the adjustment ^ 8 -path. For example, a scale can be provided on the wrench sleeve which for example is held firm during rotation of the gear while a mark on the wrench rod moves relative to the scale in order to make the angle of rotation visible.
The invention will be now explained in greater detail with reference to the accompanying drawings.
Fig. 1 shows enlarged a plan view and partially a cross section of a bone plate according to the invention.
Fig. 2 shows a cross section through the bone plate of Fig.
1 along linP 2-2.
Fig. 3 shows a cross section through the bone plate of Fig.
1 a1ong line 3-3.
Fig. 4 shows partially in cross section a tool for the ad-justment of the bone plate according to Figures 1 to 3.
Fig. 5 shows different lllustrations of the gear including a set nut.
_ 9 _ Before describing the details illustrated in the drawings, it is premised that every described feature is of signi-ficance to the invention per se or in conjunction with features of the claims.
The drawings~are only diagrammetrical and not in scale.
The bone plate shown in the Fi gures 1 to 3 comprises ~
housing 10 guiding plate portions 11, 12 in ~a manner to be described later. The housing 10 comprises a bottom portion 13 U-shaped in cross section and a plate-like lid portion 14, the portions may be attached to each other by soldering, welding or the like. The height h of the housing for example is about 3 mm. Its width b is for example about 10 mm.
The area of the plate portions 11, 12 beyond the housing 10 is conventionally designed. 1t consists of strip-like webs 15 which interconnect hole boundaries 16 adapted to receive small bone screws. The webs 15 are dimensioned such that the bone plate can be conformed to the surface contour of a bone by a manual deformation. The portion of the plate portions 11, 12 cooperating with housing 10 is 1 3~0669 U-shaped and includes legs 20; 21 and ?2, 23, respectively.
The legs 20, 21 and 22, 23, respectively, are inter-connected by transverse webs 24 and 25, respectively. Each leg 20, 23, respectively, of the plate portions 11, 12 lies against the inner wall of the housing as can be seen in ~he Figures 1 and 2. The inner edges of the legs 20, 21 are engaged by the other legs 22, 21, respectively. The latter are formed as racks having a toothing 26, 27.
A gear 30 is located between the bottom of bottom portion 13 and lid 14 of the housing, th2 gear being rotatably supported by a shaft portion 31 within an opening 32 of lid 14. The shaft portion 31 as can be seen in Fig. 1 is provided with an internal he~agon. The gear 30 engages on :
diametrically opposing points the toothing 26, 27 of legs 22, 21. In the position shown in Fig. 2 the plate por-tions 11, 12 are telescopically placed one into the other as most as possible. If gear 30 is rotated in anti-clock-wise direction, the plate portions 11, 12 are displaced away from each other, the double displacement of the plate portions 11, 12 leads to a double displacement path if compared with a displacement where only a single toothing is cooperating with gear 30.
Not shown fixing means, e.g. a set screw, cooperating with the legs of ~he guide portions of plate portions 11, 1? or with the gear 30 or the gear shaft 31 take care for a securing of ~he plate portions in each position adjusted.
As can be seen in Fig. 3, the external parts of the pla~e portions are offset relative to the guide portions within the housing 10. This is achieved by a cranking as is in-dicated in~Fig. 3 at 38. Thus, the lower side of the external plate portions are aligned with the lower side of housing 10.
In the embodiment shown, the transverse webs 24, 25 and the legs of the guide portions are connected with the ex-ternal plate portions through two webs. It is understood that deviating constructiona1 alternatives can be selected.
If the transmission ratio between gear 30 and the gear racks 21, 22 is too large, for example a further pinion can be provided as indicated by dotted lines at 40 in Fig.
1. In this case, the gear shaft 31 is not associated with gear 30 but with pinion 40. By this, a corresponding gear reduction can be achieved in order to obtain a small adjust^
ment of the plates 11, 12 upon a relative l~rge angle of rot~tion, .
In FigO 5 a gear 30' is shown whlch corresponds to gear 30 of Figs. 1 to 3. Its shaft 31' has an external thread onto which a threaded slee~e 45 is screwed. The threaded sleeYe 45 has an external hexagon 46. The shaft 31' has an in-ternal hexagon 34'. As can be seen. the sleeve 45 serves to fix shaft 31' and thus gear 30' in a predetermined position if the sleeve 45 engages the outer surface of the lid portion 14' of the guide housing not shown. If the sleeve 45 is untightened, the gear 30' can be rotated by means of a respective tool. Such a tool is shown in Fig. 4 by way of example. A wrench rod 50 has hexa~onal surfaces 41 at one end thereof which for exampl~ can engage the internal hexagon 34 or 34'. At the other end of the wrench rod 50 a knurled knob 52 is for~ed. A wrench sleeve 53 is slidably positioned on the wrench rod 50, the sleeYe 53 having a head 53 including internal hexagonal wrench sur-faces 54, a knurted knob 55 being positioned at the other end of the sleeve 53. The wrench head 53 can for example cooperate with the external hexagon 56 of the set sleeve 45. By means of the combination tool of ~ig. 4, an adjust-ment of gear 30' and an actuation of the set sleeve 45 can be carried out subsequently. The knob 45 can be provided with a scale not shown, a mark on knob 52 can be associated with the scale ~n order to make visible the rota~ion of gear 30' in fornl of angle degrees or the linear adjustment path of plates ll, 12.
The invention refers to a bone plate, particularly to a small bone plate having two plate portions longitudinally displaceable relative to each other. Usually bone plates are designed to stabilize fractural segments and to facilitate the growing together of the bone in the fracture area. It îs known to build a bone plate of two parts adapted to follow a change in the length of the bone. A change of length for example may occur by a compression of the fractual segments which for example may be carried out with a specific compression device which is for example k.nown Erom the German patent specifications 29 38 202 or 31 34 120. A change of length can also occur caused by a sin~ering process in the fractural region occurs or with bones o~ adolescent patients. It is for example known to provide two telescopically engaged bone plates with toothed portions in order to adjust a prede-termin~d plate length. It is also known from the German patent specification 31 34 120 to locate gear means between associated plate portions for the compression of fractural bone segments. The gear means is arranged in a housing on a first plate while the output sha~t of the gear means co-operates~with the second plate which can be attached to~
the bone through a bone screw, the bone screw being in-serted through an elongated hole of the first plate. Such compression means may be suitable for fractures of limbs, however, in connection with smaller bone plates, parti-cularly in case of applications wherein a small cover of soft tissue exists, e.g. in the face or the like. the known device is not appropriate.
~ ::
It is also known from the German patent specification ~
35 04 616 to adjust a clamping means by a threaded spindle -relative to a fixedly supported clamping means. Su~h a device can be applied only externally, thus, cannot be .
1 32066C~
applied to the facial skeleton.
Hence the object of the invention is to provide a bone plate which permits an extension or a contraction, respectively, also with smaller bone plates.
The invention provides a bone plate suitable for internal use on a portion o-f a human body where only a small cover of soft tissue exists, said bone plate permitting both extension and contraction and comprising: (a) a first plate portion and a second plate portion longitudinally displaceable relative to each other and including screw holes for bone screws, and (b) gear means located between said first plate portion and said second plate portion and adapted to adjust the relative position of said first plate portion and said second plate portion, and (c~ a guide nlember in the shape of a substantially flat housing, wherein said first plate portion has a first guide por-tion comprising a -first set of parallel legs and said second plate portion has a second guide portion comprising a second set of parallel legs, wherein said firs-t set of parallel legs are telescopically insertable into said second set of parallel legs, wherein said second set of parallel legs have outer edges which are longitudinally slidable within and contact and are guided by said guide member, wherein at least one item selected from the group consisting of said first ~uide portion and said second guide portion includes a rack, wherein said gear means or pinion is rotatably supported within said guide member and is engaged by said rack, and wherein said gear means or pinion has tool-engaging surfaces.
Satisfactorily operating small bone plates are for example known from the German Utility Model 87 96 912. Above all, they are designed for the application to fractures of the cranial and facial skeleton and for small fractural ssgments of other skeleton portions. In the known small bone plates, so-called screw hole boundaries are connected to webs, pre~erably at least a part of the webs having a cross-sectional surEace which is equal to or smaller than twice the cross-sectional surface of the screw hold boundary. The relatively thin pla-tes are so dimensioned that they are adapted to be deforrned by the surgeon in order to conform to the bone in the region of application. It is intended to avoid a noticeable deformation of the screw hole boundaries when the plate is bent in the plane. For this, it is advantageous if the radius of transition from the web to the screw hole boundary is dimensioned to be very small.
The bone pIate according to the invention is particularly suited -for the small bone plate mentioned above, the application of the invention, howevert is not restricted thereto.
Preferably, according to an embodiment of the invention each plate portion has a rack, the racks coacting with diametrically opposed portions of the pinion. By this, the pinion sha~t is not subjected to single acting bendiny forces. The bearing for the gear shaft can be designed to be relatively simple~ A two-rack engagement has the further advantage that the adjustment path can be doubled. Therefore, only a relatively small rotation of the gear leads to a corresponding adjustment path. It is understood tha-t the path length depends on the diameter of the gear.
~) The bone plate according to the in~ention can be designed relatiYely flat so that it can be applied internally and also where only a small covering by soft tissue is existing.
The guide member for example can be designed as relative1y flat housing, the guide channel in the housing having only a depth which is sufficient to receive the gear or the rack portions of the plate portions~ respectively. The tool engaging means for a rotating tool can for example be provided by an inner hexagon of the gear shaft. An adjust-men~ of the bone plate according to the invention can be made at relatively short time intervals without unduly troubling the patient. The bone plate according to the invention is preferably used for extension purposes, e.g.
for osteotomies.
The bone plate according to the invention can be made very small, the guide member may be have a width of 10 mm. Its thickness can be about 3 mm. The plate itself can have only a thickness of about 0,7 mm.
According to a particularly preferred embodiment of the invention the guide portions include two parallel legs, the legs of both guide portions being telescopically in-serted one into the other, the outer edge of the outer ,~ 1 320669 legs being guided by ~he associated internal wall of the guide housiflg. By this, an effective support of the guide portions of the plate portions within the guide housing can be achieved securing that a clamping during a dis-placement due to single acting tension or compression forces is avoided.
The guide member or the guide housing, respectively, accor-ding to a further embodiment of the invention may be pro-vided with a scale, a mark at the gear or the gear shaft, respectively, cooperating with the scale in order to in-dicate the rotational angle or the adjusted path, for example upon an extension.
In order to avoid a backward displacement after an ex-tension or a contra~tion under internally effecting forces suitably set means have to be provided. For example, a set screw can be provided securing the plate portion against the movement relative to each other. Alternatively, the gear shaft or the gear itself can be fixed in each position by a set screw.
!
~ 7 A further modification for securing the gear against ro-tation comprises a gear shaft having an external thread onto which a counternut is screwed adapted to engage the associated surface of the guide member or guide housing, respectively. This nut for example can be formed of a sleeve which for example has hexagonal surfaces on its external surface. The re1easing of the set nut and the rotation of the gear, respectively, requires two different wrench surfaces. For this a combined tool can be used which for example comprises a rod having wrench surfaces for the internal hexagon of the gear shaft which rod being te-lescopically displaceable in a sleeve having a head with internal wrench surfaces. For the removing or the tighte-ning of the counternut the wrench sleeve is slightly slided beyond the wrench rod for engagement with the counternut. The wrench rod itself engages the internal hexagon of the gear shaft. After the counternut is re-lieved, a corresponding rotation can be carried out by the wrench rod.
It is preferred to recognize the angle of rotation since this angle o~ rotation is proportional to the adjustment ^ 8 -path. For example, a scale can be provided on the wrench sleeve which for example is held firm during rotation of the gear while a mark on the wrench rod moves relative to the scale in order to make the angle of rotation visible.
The invention will be now explained in greater detail with reference to the accompanying drawings.
Fig. 1 shows enlarged a plan view and partially a cross section of a bone plate according to the invention.
Fig. 2 shows a cross section through the bone plate of Fig.
1 along linP 2-2.
Fig. 3 shows a cross section through the bone plate of Fig.
1 a1ong line 3-3.
Fig. 4 shows partially in cross section a tool for the ad-justment of the bone plate according to Figures 1 to 3.
Fig. 5 shows different lllustrations of the gear including a set nut.
_ 9 _ Before describing the details illustrated in the drawings, it is premised that every described feature is of signi-ficance to the invention per se or in conjunction with features of the claims.
The drawings~are only diagrammetrical and not in scale.
The bone plate shown in the Fi gures 1 to 3 comprises ~
housing 10 guiding plate portions 11, 12 in ~a manner to be described later. The housing 10 comprises a bottom portion 13 U-shaped in cross section and a plate-like lid portion 14, the portions may be attached to each other by soldering, welding or the like. The height h of the housing for example is about 3 mm. Its width b is for example about 10 mm.
The area of the plate portions 11, 12 beyond the housing 10 is conventionally designed. 1t consists of strip-like webs 15 which interconnect hole boundaries 16 adapted to receive small bone screws. The webs 15 are dimensioned such that the bone plate can be conformed to the surface contour of a bone by a manual deformation. The portion of the plate portions 11, 12 cooperating with housing 10 is 1 3~0669 U-shaped and includes legs 20; 21 and ?2, 23, respectively.
The legs 20, 21 and 22, 23, respectively, are inter-connected by transverse webs 24 and 25, respectively. Each leg 20, 23, respectively, of the plate portions 11, 12 lies against the inner wall of the housing as can be seen in ~he Figures 1 and 2. The inner edges of the legs 20, 21 are engaged by the other legs 22, 21, respectively. The latter are formed as racks having a toothing 26, 27.
A gear 30 is located between the bottom of bottom portion 13 and lid 14 of the housing, th2 gear being rotatably supported by a shaft portion 31 within an opening 32 of lid 14. The shaft portion 31 as can be seen in Fig. 1 is provided with an internal he~agon. The gear 30 engages on :
diametrically opposing points the toothing 26, 27 of legs 22, 21. In the position shown in Fig. 2 the plate por-tions 11, 12 are telescopically placed one into the other as most as possible. If gear 30 is rotated in anti-clock-wise direction, the plate portions 11, 12 are displaced away from each other, the double displacement of the plate portions 11, 12 leads to a double displacement path if compared with a displacement where only a single toothing is cooperating with gear 30.
Not shown fixing means, e.g. a set screw, cooperating with the legs of ~he guide portions of plate portions 11, 1? or with the gear 30 or the gear shaft 31 take care for a securing of ~he plate portions in each position adjusted.
As can be seen in Fig. 3, the external parts of the pla~e portions are offset relative to the guide portions within the housing 10. This is achieved by a cranking as is in-dicated in~Fig. 3 at 38. Thus, the lower side of the external plate portions are aligned with the lower side of housing 10.
In the embodiment shown, the transverse webs 24, 25 and the legs of the guide portions are connected with the ex-ternal plate portions through two webs. It is understood that deviating constructiona1 alternatives can be selected.
If the transmission ratio between gear 30 and the gear racks 21, 22 is too large, for example a further pinion can be provided as indicated by dotted lines at 40 in Fig.
1. In this case, the gear shaft 31 is not associated with gear 30 but with pinion 40. By this, a corresponding gear reduction can be achieved in order to obtain a small adjust^
ment of the plates 11, 12 upon a relative l~rge angle of rot~tion, .
In FigO 5 a gear 30' is shown whlch corresponds to gear 30 of Figs. 1 to 3. Its shaft 31' has an external thread onto which a threaded slee~e 45 is screwed. The threaded sleeYe 45 has an external hexagon 46. The shaft 31' has an in-ternal hexagon 34'. As can be seen. the sleeve 45 serves to fix shaft 31' and thus gear 30' in a predetermined position if the sleeve 45 engages the outer surface of the lid portion 14' of the guide housing not shown. If the sleeve 45 is untightened, the gear 30' can be rotated by means of a respective tool. Such a tool is shown in Fig. 4 by way of example. A wrench rod 50 has hexa~onal surfaces 41 at one end thereof which for exampl~ can engage the internal hexagon 34 or 34'. At the other end of the wrench rod 50 a knurled knob 52 is for~ed. A wrench sleeve 53 is slidably positioned on the wrench rod 50, the sleeYe 53 having a head 53 including internal hexagonal wrench sur-faces 54, a knurted knob 55 being positioned at the other end of the sleeve 53. The wrench head 53 can for example cooperate with the external hexagon 56 of the set sleeve 45. By means of the combination tool of ~ig. 4, an adjust-ment of gear 30' and an actuation of the set sleeve 45 can be carried out subsequently. The knob 45 can be provided with a scale not shown, a mark on knob 52 can be associated with the scale ~n order to make visible the rota~ion of gear 30' in fornl of angle degrees or the linear adjustment path of plates ll, 12.
Claims (13)
1. A bone plate suitable for internal use on a portion of a human body where only a small cover of soft tissue exists, said bone plate permitting both extension and contraction and comprising:
(a) a first plate portion and a second plate portion longitudinally displaceable relative to each other and including screw holes for bone screws, and (b) gear means located between said first plate portion and said second plate portion and adapted to adjust the relative position of said first plate portion and said second plate portion, and (c) a guide member in the shape of a substantially flat housing, wherein said first plate portion has a first guide portion comprising a first set of parallel legs and said second plate portion has a second guide portion comprising a second set of parallel legs, wherein said first set of parallel legs are telescopically insertable into said second set of parallel legs, wherein said second set of parallel legs have outer edges which are longitudinally slidable within and contact and are guided by said guide member, wherein at least one item selected from the group consisting of said first guide portion and said second guide portion includes a rack, wherein said gear means or pinion is rotatably supported within said guide member and is engaged by said rack, and wherein said gear means or pinion has tool-engaging surfaces.
(a) a first plate portion and a second plate portion longitudinally displaceable relative to each other and including screw holes for bone screws, and (b) gear means located between said first plate portion and said second plate portion and adapted to adjust the relative position of said first plate portion and said second plate portion, and (c) a guide member in the shape of a substantially flat housing, wherein said first plate portion has a first guide portion comprising a first set of parallel legs and said second plate portion has a second guide portion comprising a second set of parallel legs, wherein said first set of parallel legs are telescopically insertable into said second set of parallel legs, wherein said second set of parallel legs have outer edges which are longitudinally slidable within and contact and are guided by said guide member, wherein at least one item selected from the group consisting of said first guide portion and said second guide portion includes a rack, wherein said gear means or pinion is rotatably supported within said guide member and is engaged by said rack, and wherein said gear means or pinion has tool-engaging surfaces.
2. The bone plate of claim 1, wherein said first set of parallel legs includes said rack and wherein said gear means is located interior to said first set of parallel legs.
3. The bone plate of claim 2, wherein said housing has a channel like housing portion which is covered by a plate like housing portion.
4. The bone plate of claim 1, wherein said first guide portion and said second guide portion include a first rack and a second rack, respectively, which racks engage said gear means on diametrically opposed locations.
5. The bone plate of claim 2 wherein said plate portions adjacent said guide member are such that the lower side of each plate portion is approximately aligned with the lower side of said guide member.
6. The bone plate of claim 2 comprising at least a further gear means, wherein said further gear means is rotatably supported in said guide member and engages said first gear means, and wherein said further gear means has a smaller diameter than said first gear means and includes tool-engaging surfaces for a rotating tool.
7. The bone plate of claim 2, wherein said gear means has a hexagonal surface located within said gear means and suitable for engagement by a hexagonal wrench.
8. The bone plate of claim 2, wherein said gear means is associated with a fixing member which fixed said gear means in a selected position.
9. The bone plate of claim 2, wherein said gear means has a gear shaft having an external thread onto which a counternut is screwed and said counternut is adapted to be turned against a surface of said guide member.
10. The bone plate of claim 9, wherein a sleeve-like counternut is provided having tool-engaging surfaces for a tool.
11. The bone plate of claim 7, wherein said gear shaft and said counternut are shaped such that a sleeve-like first wrench for said counternut is slidably displaceable on a rod-like second wrench for said hexagonal surface.
12. The bone plate of claim 11, wherein said guide member has a scale on its outer surface and said gear means has a mark associated with said scale.
13. The bone plate of claim 11, and including also a first wrench which includes a scale for cooperation with said guide means and including also a second wrench which bears a mark which cooperates with said scale.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE8807909U DE8807909U1 (en) | 1988-06-18 | 1988-06-18 | |
| DEG8807909.0 | 1988-06-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1320669C true CA1320669C (en) | 1993-07-27 |
Family
ID=6825165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000602992A Expired - Fee Related CA1320669C (en) | 1988-06-18 | 1989-06-16 | Bone plate, particularly small bone plate |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5129903A (en) |
| EP (1) | EP0347658B1 (en) |
| JP (1) | JPH0263455A (en) |
| AT (1) | ATE93702T1 (en) |
| CA (1) | CA1320669C (en) |
| DE (2) | DE8807909U1 (en) |
| ES (1) | ES2042879T3 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2443363A (en) * | 1942-04-13 | 1948-06-15 | Townsend Kenneth | Bone plate |
| US2406832A (en) * | 1945-03-05 | 1946-09-03 | Mervyn G Hardinge | Fracture plate |
| FR1051847A (en) * | 1952-02-28 | 1954-01-19 | Adjustable splint for osteosynthesis, allowing the impaction of fragments | |
| FR1239266A (en) * | 1959-10-30 | 1960-08-19 | Improvements to internal osteosynthesis splints with extramedullary fixation for long bones | |
| US3604414A (en) * | 1968-08-29 | 1971-09-14 | Nicomedes Borges | Bone setting device |
| US3900025A (en) * | 1974-04-24 | 1975-08-19 | Jr Walter P Barnes | Apparatus for distracting or compressing longitudinal bone segments |
| DE2437752C3 (en) * | 1974-08-06 | 1982-02-18 | Schulze, Wilhelm, 4760 Werl | Adjustable splint for use with broken bones |
| SU610518A1 (en) * | 1977-01-18 | 1978-06-15 | Крымский Государственный Медицинский Институт | Rib surgery device |
| DE2938202C2 (en) * | 1979-09-21 | 1982-10-28 | Paul Prof. Dr. 4400 Münster Brinckmann | Clamping device for a pressure plate for performing pressure osteosynthesis |
| FR2509167A1 (en) * | 1981-04-23 | 1983-01-14 | Cortanze Andre | Fixing plate for fracture bone - comprises two juxtaposed channel sections slidable relative to one another with alignable holes receiving fixing pins |
| DE3134120A1 (en) * | 1981-08-28 | 1983-03-17 | Anton Dr. 4400 Münster Härle | CLAMPING DEVICE FOR AN OSTEOSYNTHESIS PLATE |
| IT1183736B (en) * | 1984-02-13 | 1987-10-22 | Orthofix Srl | EXTERNAL MINI-FIXER, PARTICULARLY SUITABLE FOR USE AS AN EXTENDER |
| DE8706912U1 (en) * | 1987-05-14 | 1987-08-27 | Howmedica Gmbh, 2314 Schoenkirchen, De |
-
1988
- 1988-06-18 DE DE8807909U patent/DE8807909U1/de not_active Expired
-
1989
- 1989-06-08 DE DE89110368T patent/DE58905427D1/en not_active Expired - Fee Related
- 1989-06-08 ES ES89110368T patent/ES2042879T3/en not_active Expired - Lifetime
- 1989-06-08 EP EP89110368A patent/EP0347658B1/en not_active Expired - Lifetime
- 1989-06-08 AT AT89110368T patent/ATE93702T1/en not_active IP Right Cessation
- 1989-06-09 US US07/364,045 patent/US5129903A/en not_active Expired - Lifetime
- 1989-06-16 CA CA000602992A patent/CA1320669C/en not_active Expired - Fee Related
- 1989-06-19 JP JP1156620A patent/JPH0263455A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| ES2042879T3 (en) | 1993-12-16 |
| JPH0575424B2 (en) | 1993-10-20 |
| JPH0263455A (en) | 1990-03-02 |
| US5129903A (en) | 1992-07-14 |
| ATE93702T1 (en) | 1993-09-15 |
| EP0347658A1 (en) | 1989-12-27 |
| DE8807909U1 (en) | 1988-10-20 |
| DE58905427D1 (en) | 1993-10-07 |
| EP0347658B1 (en) | 1993-09-01 |
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| Date | Code | Title | Description |
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| MKLA | Lapsed |