US2524363A - Disposable syringe - Google Patents

Description

Patented Oct. 3, 1950V UNITED `STATES PATENT oFFlcE y DISPOSABLE SYRINGE Arthur E. Smith, Los Angeles, Calif. i Application duly 19, 1947, Serial No. 762,148

3 Claims. (Cl. 12S- 220) This invention relates to disposable syringes.

rihe general object of the invention is to pro vide an improved disposable syringe useful for the injection of medicinal preparations and wherein a novel plunger member is employed-for causing the injection.

.A further object of the invention is to provide a novel plunger for use in a syringe.,

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings, wherein:

Fig. l is a side elevation of a my invention;

Fig. 2 is a central, sectional view on a large scale of a syringe;

Fig. 3 is a view similar to Fig. 2 showing a modication, and

Fig. 4 is a view similar to Fig. further modication.

Referring to the drawing by reference characters, I have shown my invention as embodied in a syringe indicated generally at ID. As shown the syringe includes an ampule or barrel Il, which may be made of plastic and which is cylindrical and has a stopper l2 which may be made of rubber and which is mounted in one end of the ampule. The stopper includes a projecting flange I3 and has an inwardly directed recess Ill and an outwardly directed recess I5 with a diaphragm I6 between the recesses.

The syringe includes a plunger, indicated generally at Il. The plunger is shown as tubular and may be made of plastic or glass. A cylindrical piston stopper I 8 is arranged within the plunger and has a projecting end I 9 which has piston rin-g forming beads 2i! integral therewith. I show three of the beads 2U although the number may be varied as desired.

The piston stopper I8 has a bore 2i therethrough. At its inner end the bore 2! is enlarged to form a recess 22 and in this recess I arrange a protuberance 23 on a hypodermic needle 24 which extends forwardly through the bore ZI and has its forward end arranged in a bore 3U in a front member 3l. The front member includes a liange 32 which may be grasped by the lingers of the operator during an injection. The front member includes a recess 33 which communicates with the bore 3B. The needle extends forwardly from the front member and at its free end is sharpened as at 34. The forward end of the front member tapers as at 35 and is engaged by a cap 36 which surrounds the needle and maintains the latter in sterile condition.

syringe showing 2 showing a In use the parts are constructed as described and are assembled preferably with the plunger El fully advanced into the ampule. A hypodermic needle is then inserted through the diaphragm i6 and the medicament or solution` to be injected is forced into the ampule and as this occurs the piston stopper I8 andplunger I'I are caused to be moved awayfrom the stopper I2. The amount of movement of the piston indicates the amount of medicine within the ampule and when the correct amount has been passed into the ampule the hypodermic needle is withdrawn from the diaphragm It. The hole is self-sealing due to the resiliency of the material. The cap 35 is then placed `on the tip 35 to maintain the needle 34 in sterile condition.

In use the cap 35 is withdrawn and the needle Sli is inserted in the patient. The barrel II is then pushed forward a slight distance and then withdrawn and if blood appears in the ampule, it will show the needle is in a blood vessel, whereupon the needle may be withdrawn and correctly inserted. When upon withdrawal of the barrel l I there is no appearance of blood within the barrel, this fact will indicate to the operator that the needle has been correctly inserted. The ampule is then pushed along the plunger, thus reducing the volume within the ampule and causing the medicamentous substance to be forced through the needle 24. The needle is held securely in place due to the fact that it is resiliently engaged by the wall of the plunger bore. The protuberance 22 on the needle also prevents forward movement of the needle.

In the modication shown in Fig. 3 the construction is similar and includes a syringe IU which employs an ampule I I', and a stopper I2', having a flange I 3 thereon. The plunger includes a body lill having integral piston ringforming beads 4I thereon. The plunger includes an axial recess l2 which communicates with a bore #i3 in which a needle it is arranged. The needle lill has a protuberance i5 arranged in the recess 42. The plunger includes a front member 46 having a flange 4l and having a tip 48.

In the modication shown in Fig. 4 the syringe I0 includes an ampule II" having an integral closure I2 which has an integral llange I3. The plunger includes a body 4G which has resilient piston rings lll arranged in grooves 44". The plunger includes an axial recess 42' which communicates with a bore 43. The bore 43 communicates with a needle 4d arranged in the forward part of the bore 43. The needle is surrounded by la protuberance 45. The plunger -Jl includes a front member portion 46' which has a ange 41 thereon and a tapered tip 48'.

The modified types of syringe are used in the same manner as that described in connection with Figs. 1 and 2.

From the foregoing description it Will be apparent that I have invented a novel hypodermic syringe which may be economically manufactured and which is highly efficient for its intended use.

Having thus described my invention, I claim:

1. A syringe comprising a cylindrical ampule member and a plunger having a piston forming portion thereon forming a closure for and slidable in one end of the ampule, a closure for the other end of the ampule, an elongated body having an axial bore therethrough, the inner end of said bore being enlarged, a hypodermic needle extending through said plunger bore and being xedly held in place by its resilient engagement With the Wall of the plunger bore, said needle having a protuberance thereon disposed in the enlarged portion of the plunger bore, said plunger having a fingerr engaging portion thereon.

2. yA syringe comprising a cylindrical ampule member and a plunger having a piston forming portion thereon forming a closure for and slidable in one end of the ampule, a closure for the other endrof the ampule, said plunger including an elongated body having an axial bore therethrough, the inner end of said bore opening into the ampule, a hypodermic needle extending through said plunger bore, said plunger bore including an enlarged portion, said needle having a protuberance thereon disposed in the enlarged portion of the plunger bore, said plunger including a projecting tip having a finger engaging flange, said needle being xedly held in place by its resilient engagement with the Wall of the plunger bore.

3. A syringe comprising a cylindrical ampule, a plunger, a stopper disposed in one end of the ampule, said plunger including a hollow, tubular body having a piston stopper therein at one end, said piston stopper including a portion projecting beyond the inner end of the body and engaging the inner wall of the ampule, and forming a closure for the other end of the ampule, said piston stopper having an axial bore therethrough, the inner end of said bore being enlarged, and a hypodermic needle extending through said piston bore, said plunger having a front member thereon, said front member including a portion Within the plunger and a projecting tip, said front member having a finger engaging flange, said front member having an axial bore, said needle extending through said front member bore, said needle being 'lxedly secured in the front member and piston stopper bores by its resilient engagement with the Wall of the bores.

ARTHUR E. SMITH.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number l Name Date 1,712,070 Cressler May 7, 1929 1,715,771 MacGregor June 4, 1929 1,817,003 Hein Aug. 4, 1931 1,848,711 Hall Mar. 8, 1932 FOREIGN PATENTS Number Country Date 17,069 Great Britain July 22, 1909

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