US2577556A - Cartridge syringe, including a cannula attaching chuck - Google Patents

Description

D. c. WILLIAMS v 2,577,556

Dec. 4, 1951 CARTRIDGE SYRINGE, INCLUDING A CANNULA ATTACHING CHUCK Filed Feb. 4, 1950 Patented Dec. 4, 1951 SYRIGJNLUDIG A GANNUIiAATTACHING'CHUCK David; 0.- Willam's. N eedhar Heights, Massa: as'- signor to MacGregor Instrument Company, Needham,I Mass.,L a corporation of. Massachu- Seas Aspliestierebruaf'y 4, 195o; serial-m1421310 claims.. (c1. ice-aie?) My present invention relates toA` cartridge syringes and particularly to novel chuckr means therefor that enable the needles for` use with such` syringes to consist simply of? cannulae pointed'at both ends. i

It has long beenI the: practice' for cartridge syringers, which because they are widely used'y in the dental iield are commonly called dental syre inges, to provide needles consisting of cannulae completed by providing:k them with. scr-called head shells intermediate their pointed@ ends. The reason' for that construction is thatthe conf- `ventional cartridge syringe receives acartiidgle closed at its front end by a diaphragm and at its rear end by a stopper and when the syringe is assembled for use, that cartridgeis thrust forward: into a seated position; The cannula' receiving bore in the syringey tip has a* seatfr' the head shell so that when thehead-.s'hell is clamped against its seat by a nut threade'don the Syringe tip', the cannula is securely locked-.to the syringe with its rear end entrant oi thev syringe to pierce the diaphragm of the cartridge as it is'se'ated?. The stopper of the cartridge acts as: aiV plunger when engaged and driven forwardly by the syrn'g'episton. v Y While such needles have proved satisfactory that they were adapted to be securely' locked t' cartridge syringes,v they are. relatively experi; silve due tothe yfact that the head shells are separately formed from tin AerV leadI and' tln slipped onto and swaged to thel cannnlae'i I-t-is the principal objective of this' inventinto vide means whereby needles for' cartridge S'y'l ifnges'l may be simply cannu-laeot suitabletublar 'stock of desired length 'and pointed 'at-both; ends,

and be securely locked tothe tips of' cartridge 'syringes as such cannulae maybev easily' and v eili'aciently produced to sell at such a lowcost that dentists or other users will, asia matter ef course, discard them after' single use ensuring'ftl-'iefpublic against they discomfort attendant the" se'wf a dull cannula and thev risk of .infection diie to careless sterilization. x

In accordance with my invention. I'priide cartridge syringes 'with n'r'ila gripping locked orV released by meansof a closing sle'ei'le threaded on the Syringe tip. The cli-'lick vj'avsfs may be either a part of the sleeve-cr apart of the Syringe tip, Yaltlioughl thefoinel costiui tion is'preferred as'it enables tlie'nany cart' dge syringes. now in use, t bev readily converted', at low cost, to receive' the cannulae that iny inveii'- tion makes possible.v For' like reasons; i pife= ferrd that the ,chuck jaws be formedI es* 2 tegrall part-of` a-chuck element to be attached' to a closing sleeve or a syringe tip, as may be de;i sired.

In' the accompanying drawings, I have lshown illustrative'- embodiments of myv invention from which' the'se and other of its novel features and advantages will be readily apparent.

Inl the drawings:

Fig. 1 is a fragmentary View, in elevation',A of a cartridge syringe in accordance withA my inven tion.

Fig: 2/ isa sectionA along the" lines 2^2 of Fig. 1i.

Fig. 3 is a perspective view of a chuck element accordance with my invention.

Fig. 4 is a longitudinal fragmentary section shwing a-modification of my invention.

Figi. 5 is a section, on' an enlargedV scale,y along the lines 5-5 of Fig. 4.

Fig".I 6 is a view, similar to Fig; 4, of another embodiment of my invention.

Figr'l is alongitudinal section on an enlarged scale through. the closing sleeve and chuck elenient of the embodiment shown in Fig. 6..

Fig; 8- is a like view illustrating the connec^-` tion of the chuck element to the closing sleeve,

and

Fig' 9 is a section, on an enlarged scale, along the lines 9&9 of Fig. 8.

In the drawings, I have indicated at I0 aconventionail cartridge syringe having an' externally threaded tip I I to which an intermediate part'of efcar'inulais connected and through which it exi'- tends so that-its pointed rear end is positioned 'te' 'pierce the diaphragm I2 of a cartridge I3 when that cartridge is seated by the assembly of ther s'yringefor use.

' In order" that' dental cannulae may consist-ofa pi'determined length of suitable tubing I4 beveled at both ends to establish points I5 and I'B I provide' cartridge syringes with chuck means adapted to grip any intermediate part of the eannula'iandto be'quickly and easily operated to iis'ui' maximum convenience to the user in atingal cannula to a cartridge syringe or in releasing' Ait thereiroin.

In Figs'. I and 2; I have shown a cartridge iiirig'et I0 of the type now widely used as evideicedvby the headf shell seat' II at the frontend the" :nnula receiving bore extending through the 'syringe tip I`|=. Threaded on the' tip Il is a closing sleeve I'B'liavingv a chamber I9the` port 2@ at the front end of which is forwardly and inwardly tapered but which iS dirilen's'ondl t receive freely the cannula I4.

Houses by the closing sleevek is' a chuck eiemeiit of preference, I provide each chuck element 2I1l with four such jaws. The free ends of the jaws 23 are dimensioned to lit the port 20 in the closing sleeve and are compressed thereby to vvgrip the cannula I4 as the closing sleeve I8 is thread-` ed onthe tip II.

Such cannula attaching means are simple and inexpensive to produce and ensure an adequate grip on the cannula but for maximum convenience to the user, I prefer that each chuck element 2| be a part of either the syringe tip or the closing sleeve.

InFig. 4, I have shown the syringe tip 24 as being of slightly greater diameter than the tip II and as having a counter bore 25 dimensioned to receive the cylindrical extension 26 which is an integral part of but of greater diameter than the body of the chuck element 2|. The extension 26 thus establishes a shoulder by which the chuck element 2| may be locked to the tip 24 as by upsetting its extremity as at 21. The closing sleeve 28 is substantially similar to the closing sleeve I8 except as to its cross sectional shape and as todimensions as required by the size of the tip 24.

In Figs. 6-9, I have shown a further embodiment of my invention in which the chuck element 2| is attached to the closing sleeve. For this purpose, I have shown a closing sleeve29 having a chamber 30 with its front part tapering towards its cannula receiving port to provide surfaces 3| engageable with the chuck jaws 23 to compress them against the cannula I4 as the closing sleeve is threaded on the syringe tip II. The closing sleeve 29 is also shown as having a counterbore 32 and internally threaded for attachment to the syringe tip II. ment 2| of this embodiment has an integral extension 33 of lesser diameter than its body thereby to establish a shoulder 34, and in Fig.i8, I have indicated a tool 35 having a concave work engaging face 35 by which the shoulder established by the counterbore 32 may b e upset, as shown at 3l' in Fig. 7, to sldably connect the chuck element 2| to the closing sleeve.v v

|The closing sleeve 2S illustrates a preferred construction whether the chuck element 2| .is connected thereto, to the syringe tip, or, asshown in Figs. l and 2, is separate therefrom but conned therebetween. As will be apparent from Fig. '7, I provide the cannula receiving port 38 as a forwardly and outwardly disposed taper with its inner extremity dimensioned to receive the cannulae but of substantially lesser diameter than the outer extremity of the forwardly and outwardly tapering mouth 39 of the cannula receiving passage 40 through the chuck element 2|. This construction of the closing sleeve and chuck elements is important as it avoids any diiliculty in inserting the cannula into the closing sleeve and ensures that the cannula, when thus inserted, enters the chuck element 2| without the necessity of hunting for its entrance.

While it is obvious that each closing sleeve must be formed to enable it to be rmly engaged and readily rotated by the user, the cross sectional The chuck .ele-

and 9 are extremely satisfactory in use. The taper of the jaw closing surfaces of the closing sleeves is, of course, that which results in the secure clamping of a cannula with minimum rotating of the sleeve.

, From the foregoing, it will be apparent that dental syringes equipped with my chuck means are extremely satisfactory in use since they are '-easily operated and ensure a tight grip on dental cannulae thereby eliminating the expense hitherto entailed in completing such cannulae by the addition of head shells thereto.

What I `therefore claim and desire to secure by Letters Patent is:

1. In a cartridge syringe, a tip member, a closing sleeve member having forwardly and inwardly inclined surfaces at the front end of its chamber and .being threaded on said tip member, and a chuck element including a plurality of resilient jaws of substantial length interconnected at their rear ends to establish a cylindrical part and disposed to have their front ends engaged and compressed by said surface as said members are threaded together, said cylindrical part and one of said members including complemental portions locking them together.

2. In a cartridge syringe, an externally threaded tip member having a recess. a closing sleeve member threaded on said tip, and a chuck element including a plurality of resilient jaws interconnected at their rear ends to establish a cylindrical part and including an integral exe tension at its rear of greater diameter than said part defining a shoulder, said extension being seated in said recess and locked to said tip, the front end of said jaws and said sleeve member having mutually engageable portions disposed to eiect the compression of said jaws as said members are threaded together.

3. The cartridge syringe of claim 2 in which portions of the tip at the mouth of its recess are disposed to engage the shoulder established by the junction of the cylindrical part and the extension of the chuck element.

4. In a cartridge syringe, an externally threaded tip member, a closing sleeve member threaded on said tip member, and a chuck element including a plurality of resilient jaws interconnected at their rear ends to establish a cylindrical part andincluding an integral, rearwardly disposed extension of lesser diameter than said part to establish a shoulder, and means in said sleeve member freely receiving said extension but engageable by the shoulder dened by the junction of said part and said extension thereby to slidably connect said chuck element to said sleeve member, the front portions of said jaws being disposed to be forced towards each other by said sleeve member as it is threaded on said tip member.

5. The cartridge syringe of claim 4 in which the means in the sleeve member comprises an internal shoulder intermediate its ends.

6. In a cartridge syringe for use with a cannula pointed at both ends, a tip,' a closing sleeve threaded on said tip and having a chamber and a cannula receiving port at its front end in communication therewith, said chamber having forwardly and inwardly inclined surfaces adjacent said port and said port being forwardly and outwardly tapered, and a plurality of resilient jaws intermediate said tip and said sleeve normally spaced to establish a cannula receiving passage and disposed toybe forced towards each other by saidy closing sleeve surfaces as said sleeve shapes of the closing sleeves shown in Figs. 5 u is threadedA on said tip thereby to clamp the s s Y cannula, the inner surfaces of said jaws being UNITED STATES PATENTS outwardly and forwardly tapered at their front Number Name Date ends to establish a passage mouth, the cross sec- 180 850 Curtis Aug 8 1876 tional area of which at its outer extremity is 1 231497 Cook "June'26 1917 greater than that of the inner extremity of said 5 1247'023 Smith NOV 20 1917 Port- 1687'324 cook oct 9'1928 DAVID C- WILLIAMS 2,455,019 McNeill Nov. so, 1948 REFERENCES CITED FOREIGN PATENTS The following references are of record in the 10 Number COllntry Date le of this patent: 19,332 Great Britain Aug. 23, 1912 551,720 Great Britain Mar. 8, 1943

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