Title:
Syringe
United States Patent 2473733
Abstract:
This invention relates to improvements in disposable hypodermic syringes. The general object of the invention is to provide an improved single-use hypodermic syringe whereby medicinal compounds such as penicillinoil-wax may be administered in an efficient manner. A more specific object of...


Inventors:
Smith, Arthur E.
Application Number:
US75151747A
Publication Date:
06/21/1949
Filing Date:
05/31/1947
Assignee:
Smith, Arthur E.
Primary Class:
Other Classes:
604/201
International Classes:
A61M5/28
View Patent Images:
US Patent References:
2345302Anesthetizing syringe1944-03-28
2102704Syringe cartridge1937-12-21
1948982Hypodermic syringe1934-02-27
1529659Hypodermic instrument1925-03-17
Foreign References:
GB495067A1938-11-07
Description:

This invention relates to improvements in disposable hypodermic syringes.

The general object of the invention is to provide an improved single-use hypodermic syringe whereby medicinal compounds such as penicillinoil-wax may be administered in an efficient manner.

A more specific object of the invention is to provide a novel plunger .for ampule type syringes.

Another object of the invention is to provide a novel closure for the ampule of a disposable syringe.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings, wherein Fig. 1 is a central sectional view of a disposable syringe showing my invention; Fig. 2 is a view similar to Fig. 1 showing the syringe prepared for use, Fig. 3 is a view similar to Fig. 1, showing the syringe after the contents have ben discharged; Fig. 4 is an enlarged fragmentary sectional view, and Fig. 5 is a central sectional view, showing a modification.

Referring to the drawing by reference character, I show my invention as embodied in a disposable syringe which is indicated generally at 10. As shown, the syringe includes an ampule 11, a plunger 12, a front member 13 and a stopper 14. The ampule and plunger may be made of plastic material while the front member 13, the stopper 14 and the piston 15 on the plunger 12 may be made of natural or artificial rubber.

The ampule II is in the form of a cylinder and the punger 12 is also cylindrical and includes a reduced portion or stem 16. The stem 16 is threaded as at 17 and the threads are arranged so that the forward face 18 thereof is inclined relative to the axis of the threaded portion while the portion 19 of the threads is substantially perpendicular to the axis of the threaded portion.

The piston 15 includes a threaded recess 20, the threads of which correspond to the threads 17. The forward end of the piston includes a recess 21 which receives the tip of a hypodermic needle (to be later described) when the plunger is at the limit of its forward movement. The front and rear peripheries 23 and 24 of the piston are rounded so that dragging and binding are reduced to a minimum when the piston moves forward or backward, as will be later described.

The piston also includes peripheral grooves 25 which prevent dragging and binding.

The stopper 14 includes a peripheral flange 30 which engages the end of the ampule 11. The outside diameter of the flange is substantially the same as the outside diameter of the ampule. The forward end of the stopper includes a recess 31 which is closed at the inner end by a diaphragm 32. An auxiliary stopper is arranged in the ampule and abuts the stopper 14. The auxiliary stopper has a forwardly opening recess 34 and a rearwardly opening recess 35, the recesses being connected by a diaphragm 36. The recesses 34 and 35 are coaxial with the recess 31 andthe recess 34 is preferably smaller than the recess 35.

The front member 13 is in the nature of a resilient cap and includes a peripheral shoulder or flange 40 which is adapted to be engaged between the index and second finger of the operator while the injection is being made. The front member includes a forwardly projecting tip 41 which has a planar forward face 41'. The front Smember includes a bore 42 which is coaxial with the front member and ampule and in this bore I seat one end of a hypodermic needle 43 which extends through the bore and through the diaphragm 44 at the inner end of the bore and enters the recess 34 in the auxiliary stopper but normally does not pierce the diaphragm 36.. The needle has a protuberance 45 thereon which has a hemispherical front end 45' and a planar rear end 45'. The needle projects forwardly at 46 " beyond the protuberance. The outer end 47 of the needle and the inner end 48 thereof are both sharpened as shown. A flexible cap member 49, which may be made of plastic material, surrounds the needle and engages the tip 41 tightly in the 35 position shown in Fig. 1. The tip 41 preferably tapers so that a tight fit may be had by the cap 49.

In use, with the parts in the position shown in Fig. .1, the operator slightly removes the cap 49 40 and then by squeezing the cap and pushing it against the protuberance the point 48 of the needle is pushed through the diaphragm 36 so that the parts assume the position shown in Fig. 2, in which condition the needle communicates 45 with the interior of the ampule. Pressure on the outer end of the plunger 12 then causes the contents of the ampule, such as penicillin-oil-wax to be injected through the needle.

In using many drugs it is essential that injec50 tion be not made in a vein or artery and to determine whether the needle has been inserted in a vein or artery, after insertion is made, the plunger is pushed slightly inwardly and then withdrawn and if the point of the needle has 56 punctured a blood vessel a partial vacuum will cause blood to be aspirated into the ampule. Thus a check is provided against improper injection.

In Fig. 5 I show a modification of my invention. In the modification the ampule I I' is similar to the ampule 11 previously described.

The front member 50 includes an integral stopper portion 51. The front member has a skirt 52 which engages the exterior of the ampule I1'.

The front member also includes a, shoulder 53 which, like the flange 40, may be engaged by the fingers of the operator while the injection is being made. A projecting tip 54 on the front member is tapered and is provided with a cylindrical bore 55 which extends therethrough and extends part way through the cork portion 51 and terminates short of a diaphragm 56. A flexible cap 49a surrounds the needle 43'. The plunger 12' includes a threaded reduced portion 16' and has a recess 60 on the inner end thereof which receives the end of a needle 43' when the plunger is at its extreme inner position. The plunger has a piston 15' which has threads similar to the threads 17. In the modification the. piston is a cylinder with the ends open as shown.

An auxiliary stopper 33' shown as like the stopper 33 previously described is arranged in the ampule II'.

In use the cap 49a is removed and squeezed to the position shown in.Fig. 5 so that it engages the shoulder portion 45a on the needle so that the needle may be pushed inwardly through the diaphragm 56 from the position shown in Fig.5,to place, the needle in communication with the interior of the ampule. The plunger 12' and associated.parts in the modification function the same as heretofore described.

In both types of my.syringe the bores 31 and 55 are large enough to receive the needle without friction but,. on the other hand, are sufficiently small to support the needle while the injection is being made.

The shape of the threads of the stopper permits the stopper to be moved rearwardly by the engagement of the teeth thereon which are perpendicular to the axis of the flanges and thus stripping of the piston from the plunger is prevented.

The use of the auxiliary stopper permits the ampule.to be filled when certain types of drugs are to be used prior to the time the outer stopper and cap are. secured in place.

In the modification it. will be noted that, a shoulder 6 is provided on the reduced portion 16' of the plunger and the piston engages this shoulder which takes a. portion of the thrust when the piston is moved forwardly.

From, the foregoing description it. will be apparent that I have invented a novel disposable hypodermic syringe which,is highly efficient in use,, which is. extremely- safe and which can. be economically manufactured, Having thus described my invention, I claim: 1. A. disposable syringe including an ampule, having a plunger-slidable- therein, said plunger comprising an elongated body having a forwardly extending- reduced portion, a piston. having-a a recess receiving said reduced portion, a stopper in-said ampule said stopper having: an axial bore, an- auxiliarry :stopper-.adjacent-to said first stopper, said auxiliary, stopper -having- aligned inner and outer recesses with a diaphragm therebetween, and a front: member in advance of saidstopper, said first front-member having a finger engaging; shoulder- thereon, said front .mehmer having a bore with a diaphragm closing the inner end of said bore, and a needle in said bore and having its inner end disposed in the outer recess of the auxiliary stopper and spaced from the auxiliary stopper diaphragm.

2. A disposable syringe including an ampule having a plunger slidable therein, said plunger comprising an elongated body having a forwardly extending reduced portion, a piston having a retess receiving said reduced portion, a stopper in said ampule remote from said piston, said stopper having an axial recess and having a diaphragm closing said recess, an auxiliary stopper adjacent to said first mentioned stopper, said auxiliary stopper having aligned inner and outer recesses with a.diaphragm therebetween, a front member on said ampule, said front member having a:finger engaging shoulder thereon, said front member having a bore and a needle in said bore and having its, inner end disposed in the outer, recess of the auxiliary stopper and spaced from the auxiliary stopper diaphragm.

3. A disposable syringe including an ampule having a plunger slidable therein, a piston on said, plunger, a stopper in said ampule remote from. said piston, said stopper having an axial recess. and having a diaphragm closing said recess, an auxiliary stopper adjacent to said first mentioned stopper, said auxiliary stopper having aligned inner. and outer recesses with a diaphragm therebetween, and a front member integral with said stopper, said front member having a finger-engaging shoulder thereon, said front member having a bore therethrough and a needle in said bore and spaced from the auxiliary stopper dia-. phragm.

4. A disposable syringe. including an ampule having a plunger slidable therein, said plunger comprising a cylindrical body having a forwardly extending reduced portion, a piston having a recess receiving said reduced portion, a stopper in said ampule remote from said piston, said stopper having an axial recess and a diaphragm, closing said recess, a.front member on said ampule, said 45. :ront member having a finger engaging shoulder. thereon, said front-member having a bore, an auxiliary stopper adjacent to said first mentioned stopper, said auxiliary stopper having a recess and having a- diaphragm closing the last mentioned recess, and a. needle slidable in said bore and having its inner end in said auxiliary stopper recess and free from the auxiliary stopper dia-. phragm.

5. A disposable syringe including an ampule, having a plunger slidable therein, said plunger comprising a cylindrical; body having a forwardly extending-reduced portion, a piston having a recess receiving said reduced portion, a stopper in. said ampule remote from- said piston, said stopper having an axial recess and having a diaphragm closing.said recess, a front member on said ampule, said front member having a finger engaging shoulder thereon, said front member: having:a forwardly projecting tip thereon, said front member-having a bore, an-auxiliary stopper adjacent to said first: mentioned stopper, said auxiliary stopper having a recess and having a.diaphragm closing the last mentioned recess, aneedle slidable in said -bore and having its, innerend in said auxiliary stopper recess and free-frpm the auxiliary stopper diaphragm, and a flexible: cap-about the outer end of said needle and seated, on the- forwardly; projecting-, tip, onp said- frontmember.

75. 6. A disposablpc syringe:, including ap aMqpule having a plunger slidable therein, said plunger having a cylindrical body and having a forwardly extending reduced threaded stem, a piston having a threaded recess receiving said stem, the rear end of said piston being spaced from the end of the body of the plunger, said piston having a rounded periphery at its front and rear ends, a stopper in said ampule remote from said piston, said stopper having an outwardly opening recess thereon and having a diaphragm closing said recess, said stopper having a peripheral flange thereon engaging the end of said ampule, an auxiliary stopper abutting said first stopper, said auxiliary stopper having coaxial front and rear recesses with a diaphragm therebetween, a front member on said ampule, said front member having an outwardly extending peripheral finger engaging bead thereon, said front member engaging said first mentioned stopper, said front member having a tapering forwardly projecting tip thereon, said front member tip having a planar front end and said front member having a bore, a needle slidable in said bore and having its inner end sharpened and normally spaced from said diaphragm, said needle having a bulbous portion spaced from said tip, said bulbous portion having a planar rear face adapted to engage the planar end of said tip, and a flexible cap about the outer end of said needle and engaging said forwardly projecting tip on said front member.

ARTHUR E. SMITH.

10 REFERENCES CITED The following references are of record in the Ije of this patent: UNITED STATES PATENTS 15 Number 1,529,659 1,948,982 2,102,704 2,345,302 Name Date Marcy -------- - Mar. 17, 1925 Cutter -------- Feb. 27, 1934 Hein --------__-- Dec. 21, 1937 Smith -------- _ Mar. 28, 1944 FOREIGN PATENTS Number Country Date 495,067 Great Britain ---- Nov. 7, 1938