US1916428A - Medical syringe - Google Patents

Description

Jufiy 4, 1933.

Filed Jan. 14, 1951 Fig.2.

Fig.1.

Patented July 4, 1933 PATENT OFFICE NIKOLAUB KOVAGS, OF VIENNA AUSTRIA MEDICAL SYRINGE Application filed January 14, 1881, Serial No. 508,784, and in Austria January 15, 1980.

This invention relates to medical syringes for storing liquids or gases and for injecting them into or taking them from the human or animal body; In particular the invention relates to syringes of the type in which a container is connected with a cannula by means of an elastic connectin tube.

The purpose of my invention is to provide improved means for controlling the passa e m of liquids or gases through the elastic tu e and at the same time to efiect a simplification of the manufacture and handling of the syrin e.

Reining to the drawing, in which the Figs. 1-3 show three preferred forms of the invention in part section views, a denotes the container or vessel for the liquid and/or the gas. The hollow metallic needle I) is fused at its rear end into a glass body or plug a.

39 A cap d which is made in one piece with the plug 0 and which has to be broken away before use protects the needle I). The parts Z 0, d, which may be of any other convenient form and material, will hereinafter be termed comprehensively the cannula B.

The cannula B isconnected with the container a by means of anelastic tube a. As

, shown in Fig. 1 this tube e is inserted like a stopper into the neck f of the container. In

a order to provide a tight joint between the elastic tube and the container a film g of acetylcellulose, gelatine, or the like is spread over the tube e and the neck 7. The flared edge h of the neck w prevents the film g from slipping 05:. A short tube 71, which is provided in the middle with an enlarged portion 7', is preferably inserted into the elastic tube which thus becomes locally distended in order to ensure an absolutely reliable adhesion of the film g. The glass body a is provided with an enlarged portion is. by means of which it is secured within the elastic tube, and with a collar Z which serves as an abutment for the elastic tube.

For the purpose of controlling the passa e of liquids or gases through the elastic tu there is provided a rigid element m of prefer-.

ably spherical form the diameter of which is greater than the internal diameter of the elastic tube, whichmember is connected with the plug 0 by means of a thin tubular connecting piece n, the duct 0 of which leads to the hollow needle Z). The passage from the containcr to the hollow needle is thus interrupted firstly by the distended wall of the as elastic tube which, in consequence of its elas ticity, pxesscs closely against the regulating member m, and secondly by the connecting piece n which is entirely closed, so that there is no connection from the hollow cylindrical as space p surrounding the connecting piece it and the duct 0 of the latter.

I As a consequence of this double interception it is impossible for liquid to ooze from the container to the needle and to rust the es latter, or for thepressure of the gas in the container to diminish even if the syringe be kept stored for a very long time.

lVhen the device is to be used, the connect- 111g piece n is first broken at a weakened In place 9 provided for instance by a file stroke. For this purpose the elastic tube lsgrasped at its outer end and at the enlargement caused by the ball m. In order to open the passage through the elastic tube entirely the wall of the tube has to be drawn away from the glassbead m. By partly or entirely releasing the Wall of the tube the injection of liquid may be throttled by degrees or instantly arrested as required. The control device is operated by two fingers only whereby no displacement of the cannula or of the container is required nor is the pressure applied to the tube transmitted to the hypodermic needle. The handling of the syringe is thus extremely safe and convenient.

In the form shown in Fig. 2 the glassbead m is connected by a thin tubular connecting piece n to the neck f of the container. Since in this case the elastic tube has to be pulled over the neck, this latter is made comparatively thin and is provided with an enlarged portion r. This modification is 1 preferably employed in blood taking devices,

which must have an evacuated container with a fused seal. The arrangement of the regulatin member m thereby renders it possible to ta e a certain 1quantity of blood in small amounts from di erent parts of the body.

This is for instance necessary if the patient 15.:

has been broken, the .tube is preferably pro-' vided with a coating of shellac. The rear end of the glass plug may be closed up b meltin to a point 8 which also has to be roken be ore use. Thus it becomes possible to connect a cannula with a vessel immediately before use, since these parts remain aseptically sealed up to this moment.

In the form shown in Fig. 3 the container a forms one piece with the regulating member m and the cannula B. The connecting piece n between the lass-bead m and the container 0 is identical wlth that shown in Fig. 2. The connecting piece between the regulatingmember m and theplug c is also of smaller diameter than the internal diameter of the connecting tube e. Into the cylindrical s ace u thus formed the duct 0 leading to the 01- low needle opens at the small aperture 1;. Before use the connecting piece n has to be broken at g.

The manufacturin costs of a syringe according to the invention are very low. Thus for instance the assembling of the device consists merely in the inserting of two glass parts into an india rubber tube; and further the work of the glass blower is much sim lified by the fact, that the container, the regu ating member, and the cannula consist of but one or two parts.

What I claim is:

1. A syringe comprising a container, a cannula, an elastic tube connecting the container with the cannula, means for securing the clastic tube to the cannula and the container, and a rigid member, the diameter of which is reater than the internal diameter of the tube,

inserted in the tube, and a rigid tube, of less diameter than the elastic tube, disposed within the tube and connected with the rigid member at one of its ends and with the cannula at its other end, and adapted to be opened by breaking, the wall of the tube being adapted to be drawn away from the rigid member to allow a passage.

2. A syringe comprising two rigid bodies, one of the said bodies being ada ted as a container andthe other of the said bodies as 3 cannula, an elastic tube connecting said bodies, means for securing the elastic tube to said bodies, a rigid member, the diameter of which is greater than the internal diameter of the tube, inserted in the tube, and a rigid tube, of less diameter than the elastic tube, disposed within the tube and connected with one of the said rigid bodies at one of its ends and with the rigid member at its other end, and adapted to be opened by breaking, the wall of the elastic tube bein adapted to be drawn away from the rigi member to allow a passage.

3. A syringe comprising a container, a cannula,'an elastic tube adapted to connect the said container with the said cannula, a rfgid member, the diameter of which is greater than the internal diameter of the said connecting tube, inserted into the said tube, tubular connecting pieces rigidly connectingthe said member with the ends of the container and the cannula lying within the said connecting tube, said connecting pieces being of smaller diameter than the internal diameter of the said connectin tube, so as to form hollow spaces within the said tube and a duct leading to the container and to the cannula respectively provided in each connecting piece, one oi the said connecting pieces being entirely closed soas to cut oil the said duct from the one hollow space and adapted to be broken in order to clear the passage from the one hollow space into the said duct, the duct within the other of the said connecting pieces opening into the other hollow space.

l. A syringe comprising a container, a cannula, an elastic tube connecting the container with the cannula, means for securing the elastic tube to the cannula and the container, and a rigid member, the diameter of which is greater than the internal diameter of the tube, inserted in the tube, and a rigid tube, of less diameter than the elastic tube, disposed within the tube and connected with the rigid member at one of its ends and with the container at its other end, and adapted-to be opened by breaking, the wall of the tube bein ada ted to be drawn away from the rigi mem er to allow a assage.

In testimony whereo I have signed my name to this specification.

NIKOLAUS KOVACS.

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