US2971509A

US2971509A - Disposable hypodermic syringe

Info

Publication number: US2971509A
Application number: US763745A
Authority: US
Inventors: Cohen Milton Joseph
Original assignee: Individual
Current assignee: Individual
Priority date: 1958-09-26
Filing date: 1958-09-26
Publication date: 1961-02-14
Anticipated expiration: 1978-02-14

Description

Feb. 14, 1961 M. J. COHEN DrsPosABLE HYPODERMIC SYRINGE Filed Sept. 26, 1958 AT TDR NEY United States Patenti() nrsPosABLE HYPODERMIC sYRlNGE Milton Joseph cohen, 5437 Connecticut Ave. NW.,

. Washington, D.C.

This invention relates to the administering to human ills and to the equipment employed in so doing, `and more particularly to facilities utilized in the combining and injection of certain substances into the human body for the treatment of certain symptoms and conditions.

The invention relates specically to hypodermic syringes by means of which injections composed of a combination of iiuid and medicament are administered in a manner that the substance injected Imay be readily absorbed in the blood stream.

a Injection into the blood stream has been done by means of solutions prepared some at a substantially earlier `period and some at the time of use and by means of hypodermics including a barrel and a movable plunger, all of which have rfallen short of what has been desired in the Way of freshness, sterility, ease `of application, and cost, and there has been t-he great possibility` of error with the usual plunger type syringe in the hands of an inexperienced operator.

It is an object of the invention to overcome the difficulties enumerated and produce an inexpensive disposable hypodermic syringe without a movable plunger but instead a syringe in which the medicament is contained sterile under pressure, either by an inert gas unit employing a lgas such as helium or other pressure producing means by which the contents of `the hypodermic syringe may readily be dispensed by the` operation ofa simple valve. p

Another object of the invention is to provide a valve container containing both medicamentV and` `pressure means for ejecting such medicament with such pressure means either in contact with the medicament containing solution or segregated therefrom and `with ejection means being either pressed air or gas, compressed spring means or both so that in the -use of the device all that is necessary is to insert the needle of the hypodermic and open the valve to permit the ejection caused by the pressure Without the application of external force and capable of being used in all positions.

Other objects and advantages of the invention will be apparent from the following description taken in conjunction with the accompanying drawing wherein:

Fig. 1 is a perspective illustrating one application of the invention;

Fig. 2, a longitudinal section on the line 2-2 of Fig.

Fig. 3, a section on the line 3--3 of Fig. 2;

Fig. 4, a modified form of the valve;

Fig. 5, a fragmentary longitudinal section of a moditied type of container; and

Fig. 6, a fragmentary longitudinal section through a further modified form.

Briefly stated, the hypodermic syringe of the present invention comprises a container or vial of glass, plastic or other substance and which container or vial serves as the barrel or cylinder of a syringe in which medicament and fluid in solution are introduced and to which pressure is applied for discharging the solution into the tissue of the patient. In addition to the barrel, the hypodermic syringe includes a needle through which the solution can be injected, a connection between the needle and the vial controlled by a valve, and injection mechanism by which the solution may be discharged by the application of the middle and forenger on the nger pieces and the thumb on the end of the barrel. The barrel containing pressure means in the form of a gas, or other means such as a cylinder of air, spring, or the like which causes the discharge of the solution when the valve is opened and when the valve is closed the discharge is stopped. Also, the invention may include in the connection between the needle and the vial, a compressible member which forms -an aspirator or pump for sucking blood into thedevice when the needle is improperly inserted into the blood vessel. A cover may be provided for protecting the needle.

With continued reference to the drawing, the hypodermic syringe of the present invention comprises a needle 10 mounted in a thickened tubular holder 11 provided with a reduced portion 12 on which a protective cover or cap 13 for the needle is frictionally received. The needle holder 11 is fastened within a tube 14 of flexible material in the opposite end of which is mounted an enlarged end 15 of a discharge tube 16, the remote end of which is adapted to engage a valve body having a peripheral portion 18 adapted to engage a resilient washer or seat 19 to control the discharge of the solution of medicament and iluid from the interior of the vial or container 20.

The liexible tube 14 is provided with a partition forming portion 21 with a small axial slit or opening 22 therethrough so that by compressing the tube it serves as an aspirator and creates a suction through the needle to draw blood through the needle into the tube provided the needle has been improperly inserted and terminates in a blood vessel. In order to protect the tube 14 a relatively sti shield 23 is provided having openings 24 to permit the enlargement of the slit or opening 22 by squeezing the tube to perform a pumping action.

In order to prevent leakage between the vial 20l and the tube 16 a crimp cap 25 is provided having an opening 26 through which the tube 16 projects and with a reduced flange 27 engaging the neck of the vial 20. A spring and valve housing 28 is provided having an annular flange '29 disposed between the resilient gasket 19 and the mouth of the bottle or vial, the housing 18 having an` opening 30 through which the solution of medicament and iluid can ow in its discharge.

A spring '31 is disposed within the housing 28 and tits around the reduced end of the valve 17 to maintain the portion 18 of the valve seated against the gasket 19. Such valve being adapted to be unseated by being engaged by the tube 16 to provide a gap or space between the

portions

18 and 19 or in other words, by the forcing of the tube 16 toward the vial 20.

In order to open the valve so that the contents of the vial can be discharged nger pieces 32 are provided being carried by a yoke 33 Amounted on the tube 16 by means of adhesive 34 or formed integrally therewith.

In the use of the disposable hypodermic syringe of the present invention containing the medicament under pressure the protective cap 13 for the'needle is removed and the needle is inserted into the tissue whereupon the transparent tube 14 is compressed by application of pressure through the openings 24 so that it can be determined if the needle has been improperly inserted in a blood vessel. If there is no sign of the improper insertion, the needle and forengers are applied to the finger grips 32 while the thumb is applied to the remote end of the vial or container 20 and upon the contraction of the ngers and thumb the vial will be moved towards the needle and cause the tube 16 to unseat the valve 17 and the discharge of the solution 35 of medicament andliquid by an inert gas 36 in the remote portion of the vial, the discharge being subject to interruption by the relaxation of the lingers and thumbl to permit the spring 31 to reseat or close the valve.

In Fig. 4 is disclosed a modified type of valve structure including a vial 37 'having an internal rib or annulus 38 seated in a groove 39 in a closure 40 in one end of the cylinder or vial 37. The closure 40 has an internally threaded valve chamber 41 with openings 42 in communication therewith and with a valve member 43 adapted to engage a valve seat 44 on the end of an externally threaded boss 45 of a connection 46 to the tube 14 with a longitudinal bore or discharge opening 47. The member 45 has an operating ange 48 so that in the use of the device by rotating the iiange 48 the flow through the

openings

42 and 47 will be controlled.

Instead of charging the bottle, vial or container 35 with the gas 36 as illustrated in the preceding iigures, pressure may be produced in numerous other ways, two of which are illustrated in Figs. and 6. v

In Fig. 5 a vial or container 50 is provided with an open end having an external flange 51. Over this open end is clamped a marginal edge of an imperviousmembrane `52 by means of a crimp cap 53 havingv one or more openings 54 for the insertion of an air injection needle for piercing a self-sealing type of gasket 55 prior to the introduction of the solution to be administered. Air pressureV may be introduced through such crimp cap against the iiexible membrane to apply pressure to a solution 56 of medicament and fluid Ifor discharge when a valve which may be of the type shown in either Figs. 2 or 4 is open. If desired the pressure may be provided by the use of a spring 57.

Additional pressure means may be employed of any desired character, one of which is illustrated in Fig. 6 in which a cylindrical air cartridge 5S is compressed into the end of the vial or container 59 prior to the introduction thereinto of the solution to be administered.

Otherwise, the structure of this ligure as well as that of Fig. 5 is the same as Fig. 2.

In the use of the hypodermic syringe disclosed in Fig. 2 the vial or barrel is filled with medicament and fluid and also gas under pressure. When ready to be used, the needle cover v13`is removed, the needle is inserted into the tissue, aspiration is accomplished, that is, the tube 14 is compressed through the openings 24 to deter- -mine that the needle has'not been improperly applied,

and with no evidence of having pierced a blood vesselv the foreiugers are engaged on the iinger grips and the thumb on the remote or closed end of the vial whereupon the contraction of the thumb and Iforefingers will open the valve and the gas pressure within the barrel or vial will discharge the contents of the vial unless the pressure is released to permit the valve to close whereupon the discharge will be terminated.

The amount and speed of injection are controlled by the amount of pressure employed, care having been taken before tthe release valve is operated to determine that the liquid is ahead of the gasto inject the liquid instead of the gas. In the use of the pressure means of Figs. 5 and 6 there is no direct contact between the gas and the solution and this type of structure may be preferred.

It will be obvious to those skilled in the art that various changes may be made in the invention without departing from the spirit and scope thereof and, therefore, the invention is not limited by that which is illustrated in the drawing and described in the specification, but only as indicated in the accompanying claims.

I claim:

1. A disposable hypodermic syringe comprising a container having medicament and a fluid under pressure, a needle, and a.Y connection between said needle and said container including a valve and a deformable portion for aspiration to indicate improper insertion of the needle, whereby when said needle is inserted said valve may be operated to release the medicament and fluid under pressure and cause the same to be injected.

2. A `disposable hypodermic syringe comprising a container for medicament and uid and having an open end and an attaching flange thereabout, a hollow needle, and a connection between said container and said hollow needle including a tube, valve means 'for controlling the discharge through said tube and said needle, and a finger grip on said tube so that such finger ygrip may be engaged. while the thumb is pressed against the end of said container to operate said valve, said tube having a cornpressible portion for aspiration to indicate improper application of said needle.