US2538391A

US2538391A - Syringe

Info

Publication number: US2538391A
Application number: US1551A
Authority: US
Inventors: Arthur E Smith
Original assignee: Individual
Current assignee: Individual
Priority date: 1948-01-10
Filing date: 1948-01-10
Publication date: 1951-01-16
Anticipated expiration: 1968-01-16

Description

Patented Jan. 16, 1951 srnmon Arthur E. Smithi Los Angeles, Calif. Application January 10, 1948, Serial No. 1,551

1 Claim.

This invention relates to a syringe.

The general object of the invention is to provide an improved syringe of the disposable type which will permit the quick preparation and ready use of a medicinal solution.

A further object of the invention is to provide a syringe including a novel plunger member.

A further object of the invention is to provide a novel plunger member for use in the 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 side elevation with parts in section showing my improved syringe and one type of discharged therefrom.

Referring to the drawing by reference characters, I have shown my invention as embodied in a syringe, indicated generally at In. As shown the syringe includes a cylindrical barrel II having a closure I2 at the front end thereof, the

closure l2 including a flange I3 engaging the outer end of the barrel, and the closure is provided with an outer bore M which is separated by a diaphragm I5 from a second bore l6, which in turn communicates with an enlarged bore I1. Within the bore It I arrange a medicinal tablet l8 and in the bore I! a displaceable sealing disc l9.

Upon the barrel II I arrange a front end closure indicated generally at 22 and which includes a skirt 23, having a finger engaging flange 24 thereon. The front end closure includes a tapering tip 25 and this tip is provided with an axial bore 25, separated by a diaphragm 21 from another bore 28. The bore 2 8 communicates with a bore 29 and the bore 29 communicates with a bore 30 which has a tapering wall 3! at one end there of. The tip 25 has an end aperture 32.

A hypodermic needle has a hub 36 thereon, the inner end of which is beveled as at 31 to fit the tapering wall 3! in the bore 39.

The barrel I I has a plunger 40 in the rear end thereof. The plunger 46 comprises a tubular member 4|, having a piston stopper 42 in the front end thereof. The piston stopper is in the nature of a cup and includes p r ph r l beads 2 v 43 with a diaphragm 44 at the inner end of the cup and with an, indentation 45 coaxially arranged. At its outer end the plunger includes a stopper 46 which has a pheripheral flange 41 and an axial recess 48 and with an indentation 49 coaxial with the recess 48. V

In operation, with the parts as shown in Fig. 2, the person using the syringe pushes in on the hub 36, causingthe inner end 50 of the needle to pierce the diaphragm I5 and thereafter dislodge the disc I9 to cause the tablet I8 to be discharged into the vehicle 5| within the barrel II. The syringe is then ready for use and by pressing on the stopper 46 the plunger is moved forward, causing the ampule contents to be discharged.

The syringe may be filled in any desired manner, although I prefer to have the parts arranged with the plunger fully within the ampule and then I insert the end of a hypodermic needle ti through the stopper 46 and the piston stopper 42. The needle BI communicates with a chamber 62 in which a piston 63 operates by means of a finger button 64. When the button 64 is depressed, liquid will fiow into the ampule I I, causing the piston to withdraw until it is in the position shown in Fig. 2, whereupon the needle 6| is removed and the syringe is ready for shipment or use.

In the present application, Serial No.1.5 51,filed January 10, 1948, the claim is directed to the piston stopper which is hollow and has pierceable front and rear closures therein, the front closure acting as a plunger and both closures being pierceable by the needle of a filling apparatus.

In applicants copending application Serial No. 548, filed January 5, 1948, the claim is directed to the outer barrel with a front closure therein and the claim includes the sliding barrel forming ampule within the outer barrel and with the piston closure in the sliding barrel at its front end. The claim also includes the piston plunger within the sliding barrel and having a piston head thereon.

Applicants copending application Serial No. 2,900, filed January 17, 1948, relates to a syringe wherein there is a barrel having a front member, a recess and with a needle extending through the front member and recess and having a protuberant portion engageable in the recess and with 'the needle adapted to be advanced to its seated position by means of a protective cap carried upon the needle.

From the foregoing description it will be apparent that I have invented a novel syringe which can be economically manufactured and which is highly efficient for its intended purpose.

Having thus described my invention, I claim:

A disposable syringe including a barrel having a resilient closure construction at the front end thereof, a resilient end member on the barrel, said closure construction including an outer recess and an inner recess with a pierceable diaphragm between the recesses, a needle movably mounted in the end member, said needle having its inner end disposed normally adjacent to said diaphragm and being adapted to pierce said diaphragm when the needle is moved inwardly, a piston plunger within said barrel, said piston plunger including an elongated tubular body having a piston head mounted on the innerend thereof, said piston head being made ofresilient material and having a peripheral portion slidable within the barrel, said piston head having a recess with a resilient, pierceable, imperforate diaphragm closing said last mentioned recess, said piston plunger having a resilient closure at the outer end thereof, said last mentioned closure having a recess and a resilient, pierceable, imperforate diaphragm closing said last mentioned recess, said piston plunger being movable in the barrel to force the contents therefrom, said resilient, pierceable, imperforate diaphragms being adapted to be pierced by a barrel filling needle with the holes made therein by the filling needle closing by the resiliency of the material when the filling needle is withdrawn.

ARTHUR. E. SMITH.

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