US1718598A - Syringe - Google Patents

Description

A. E. SMITH June 25, 1929.

SYRINGE Filed oct. 26, 1927 INVENTOR. l0 ARTHUR E. SMITH ATTORNEY.

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Patented June 25, 1929.

Ultll'lED STATES ARTHUR E. SMTH, OF LOS ANGELES, UALIFRNIA.

SYRINGE.

Application filed October 26, 192'?. Serial` No. 228,916.

This invention relates to improvements in hypotflermie syringes.

'lhe general object ot this invention is to provi dean improved syringe wherein the substance to be ejected is contained in a cartridgelilte ampule which is provided with a slidable stopper and wherein means is provided ior automaticallycorrectly positioning' an anipule in the syringe when the operating member oi the syringe is arranged in an operative position, Iand wherein in the process of injecting', the various parts of the syringe coact to move the stopper relative to the ampule to torce out 'the contents oi the ampule.

Another object of this invention is to provide a syringe having an ejecting plunger which is adapted to enter a constricted portion oi an ampule contained therein with means for automatically and correctly posi tioning the ampule before the plunger enters the eonstricted portion ot the ampule.

An additional object oi my invention is to provide a novel means for celitering an ampulc in a syringe.

Other objects of the invention will be apparent from the `following` description taken in connection with the accompanying draw ings wherein:

Fig. 1 is a central longitudinal section thi-(nigh my improved syringe showing an ampule therein and showing` the ecting plunger about to enter the ampule.

Fig. 2 is a view similar to Fig. 1 showing the positions of the various elements after the contents oi' the ampule has been ejected.

Fig. 3 is a transverse section ot the syringe taken on line l-3 of Fig. 1.

Fig. Llis a il'fragu'ientary longitudinal. section ot the syringe operating member showing` a moditied form ot' ampule positioning means.

Fig. 5 a transverse sect-ion taken on line 5-5 oil' Fig. 4i. l

Fig. G is a view similar to Fig. 4 showing another modilied form of ampule positioningr means.

Fig. 7 is a view similar to Fig. i showing still another modified term ot ampule positioning means and Fig'. 8 is a section taken on line 8 8 of Fig. 7. Y

Referringr to `the drawings by reference characters I have indicated a hypodermic syringe embodying the features of lny inven tion generally at 10. This syringe comprises hollow body portion or 11 having screw threads 12 provided at one end and having; its other end beveled as at 13. Adjacent one end of the barrel 11 a cross bar 14 is provided and in the barrel 11 equally spaced elongated slots 15 are provided.

rllhe end ot' the syringe opposite the cross bar 1li: is provided with a tip 1G which is in threaded engagement with the threads 12 oi the barrel. This tip 1G has a reduced end 17 and is provided with a tapered recess 18 which communicates with an aperture 19 which extends through the reduced end 17. A hypodermic needle 20 is adapted to be positioned ou the reduced end 17 of the tip 16 and the end 17 may be either threaded or tapered as shown.

An operating member indicated generally at is adapted to be slidably mounted within the barrel 11. This operating; member includeel a barrel 23 having an elongated aperture 24rprovided in one side thereof and an end member 25 which includes a thumb piece 26. An ejeeting` plunger 27 is detachably secured to the end member 25 and includes an enlarged head 28 and areduced tip 29.

Surrounding the plunger 27 and within the barrel 23 I provide an ampule positioning` member 30. This positioning` member 30 is provided with a conical recess 32 and a central stem 33 which surrounds the plunger 27 and may be slightly spaced therefrom. A plurality oit spring` iing'ers 34 are provided in the peripheral wall of the positioning member and are adapted to trictionally engage the inner wall ol the barrel 23 of the operating member.

ne type oit ampule such as may he used in connection with my improved syringe is in dicated generally at 36. This ampule as shown is preferably made ot glass and. comprises a tubular body 37 having a constricted end 38 which is normally closed but made open when the alnpule is made ready for use by breaking away a portion of the ampule, The opposite end oiE the ampule is also constricted as at 39 and like the end 38 is normally closed but is made open by breaking' away a portion of the ampule before it is inserted in the syringe'. This constricted end 39 is provided with a resilient collar i0 which is preferably made of a goed grade of rubber.

A. stopper 41 is normally positioned in the ampule adjacent the constricted end 38 and is movable within the ampule to act as a piston to expel the contents of the ampule out thro'lfigrh the constricted end 39. The stopper llO 41 is preferably made of a goed grade of rubber and is provided with a metal washer 42 having a central aperture therethrough of approximately the same size as the diameter of the plunger tip 29. The stopper 4i is also shown as provided with an aperture 44 of approximately the same size as the size of the aperture in the washer.

In using my improved syringe 10 the operating member 22 is removed from the syringe barrel 11 and the positioning member 30 moved to the openend of the operating member to the position shown in Fig. 1. An ampule 36, having been previously made ready for use, is then inserted into the barrel 11 so that the resilient collar 40 is positioned in the tape-red recess 18 of the tip 16 as shown. The operating member 22 is then replaced in the syringe barrel 11 and moved towards the tip 16.

As the operating member is moved the positioning member moves with it due to engagement of the spring fingers until it engages the ampule as shown in Fig. 1. As the positioning member engages the ampule it correctly'centers the ampule relative to the ejecting plungerv 27 so that upon further movement of the operating member the plunger head 28 will pass through the opening in the constricted end 38 and the reduced tip 29 will be positioned in the aperture of the washer 42 when the head 28 abuts the washer.

Upon a further movement of the operating member towards the tip 16 the ejeeting plunger 27 will cause the stopper 41 to move and act as a piston to expel the contents of the ampule out through the constricted end 39 and into the hypodermic needle 20.

All during the ejecting movement of the operating member 22 the fric-tional engagement of the positioning member 30 therewith will cause a resilient pressure to be exerted upon the ampule. Even should the ejecting movement of the operating member cease for a while the positioning' member would exert a slightV pressure upon the ampule and thus retain a iiuid tight seal between the collar 40 and t-he tapered recess 1S of the syringe tip 16. The pressure exerted upon the ampule by the positioning member is only removed when the operatingmember vis moved away from the tip 16.

After the contents of the ampuleihave been ejected as shown in Fig. 2 the operating member 22 and the ampule are removed from the syringe, the positioning member 3() moved to the open end of the operating member, and the syringe is then ready for use again.

In Figs. 4 and 5 I have shown the operating member 22 provided with a modified form of positioning member indicated generally at 45. This positioning member includes a conical recess 46 and an externally screw threaded stem 47 which surrounds the ejecting plunger 27 and is spaced therefrom. The

peripheral wall of this positioning member is provided with a plurality of slits as lshown :u 48 and is adapted to be internally engaged Iiy a coiled spring 49. A cap 50 provided with internal screw threads to match the threads on the stem 47 is adapted to move within the. positioning member to compress the Ispring to cause the spring to expand in diameter aml thus expand the peripheral wall of the positioning member to frictionally engage the inner wall of the barrel 23 of the operating member.

In Fig. (i I have shown the operatingr member 22 provided with another modilied form of positioning member indicated generally at 55. This positioning member includes a conically recessed portion 56 aml an externally screw threaded stem 57 which surrounds the ejecting plunger 27 and is spaced therefrom. The peripheral wall olf this positioning member is preferably interl'ially tapered from the bottom to the top outward and is provided with a plurality of slits 58.

A plug 59 having a hub (it) thereon provided with internal screw threads to match the threads on the stem 57, is adapted to move within the peripheral wall of the positioning member. The outer face of the peripheral wall of the plug 59 is preferably tapered to correspond to the taper of the inner face of peripheral wall of the positioning member. then the plug 59 is moved toward the recessed end ofthe positioning member the taper on the plug causes the peripheral wall of the positioning member to expand and frictionally engage the inner face of the bai'- rel 23 of the operating member 22.

In Fig. 7 I have shown the operating member 22 provided with another modified torni .of positioning member indicated at (i5. This positioning member includes a conical recess 66 and a stem 67 which surrounds the ejecting plunger 27 and is spaced therefrom. 'l`he outer perimeter of the peripheral wall (i8 of this positioning member is slightly less than the internal perimeter ot the operating member barrel but it is flattened out of a true c vlindri al shape as clearly shown in Fig. 8. 'I`he wall 68 is resilient so that frictional engagement between the barrel 23 of the operating member and the positioning member is obtained.

From the foregoing description it will be apparent that I have provided an improved syringe having novel ampule positioning means provided therein and one which is of simple construction and highly ctlieient in use.

Having thus described my invention. I claim:

1. In a syringe adapted to receive an ampule, a barrel, a tubular operating member adapted to move longitudinally in said barrel, a plunger associated with said operating member and movable therewith, an ampule Sli lili

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positioning member disposed within said operating member, said positioning member being .made of a resilientmetal and including annular peripheral side walls anda conically shaped bottom wall, said conical bottom wall merging into a stem surrounding said plung er and the inner side walls of'said stem being spaced from said plunger, said peripheral side walls being split for part of their length to form a plurality of spring fingers, said vlingers being 'free on three sides thereof from said side walls and being formed to exert outward pressure against the inner wall of said operating member.

v11. In a syringe adapted to receive an ampule, a barrel, a tubular operating member adapted to move longitudinally in said barrel, a plunger associated with said operating member and movable therewith, an a-mpule positioning member disposed within said operating member, said positioning member belng made or resilient met-al and including annular peripheral side walls and a eonically shaped bottom wall, said conical bottom wall merging into a stem adapted ki surround said plunger and thc inner side walls of said stem being spaced from said plunger7 the inner face of said peripheral side wallsl being tapered outwardly from the bottom up and being split the major portion of their length to provide a I )lurality o'f resilient sections, said stem being externally threaded, an expanding member movable within said positioning member side walls, said expanding member including a hub threaded to engage the threads oi" said stein and said expanding member when moved towards said bottom being adapted to expand said peripheral wall of said positioning member (o cause said wall to frictionally engage the inner face of said operai-mg member.

In testimony whereof, I hereunto allix my signature.

ARTHUR E. SMITH.

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