US2518165A - Instrument for the taking and injection of blood - Google Patents

Description

Aug. 8, 1950 A. c. MILLARD INSTRUMENT FOR THE TAKING AND INJECTION OF BLOOD Filed Sept. 11, 1948 I Q I INVENTOR fl/mz 6249mm mun/en BY Y ATTORNEYS Patented Aug. 8, 1950 UNITED IN STBUMENT FOR THE TAKING D INJECTION OF BLOOD Andr Charles Mil-lard, Lyon, France Application September 11, 1948, Serial No. 48,818.

In France July 9, 1 947 I 1 Claim.- (01. 128-.21:4)

This invention relates to instruments for the taking of blood and for injection.

It isalready known to provide sterile instruments. for the aseptic taking .of blood, said instruments comprising a rubber end-piece which is mounted at one end, on a test-glass for receiving theblood and is integral at itsother end, with a glass tube that carries the needle and is extended into the aforesaid end-piece bya bent part which rests against its internal periphery, advantagev being taken of the elastcity of the endpie'ce by changing .the inclination .of the needlesupporting tube in relation to the test-glass, in order to establishor .cut off communication with the vacuum previously created in the said testglass.

This kind of sterile apparatus for the aseptic taking of "bloodpresents, for the practitioner, certain difficulties by reason of the fact that, in order to ensure the maintenance of the vacuum in the test-glass when the needle has been uncovered and also to ensure the air-tightness of v the test-glass after the taking of the blood, it is necessary that the pressure of the bent part of the needle-carrying tube against the internal periphery of the rubber end-piece should be sufiiciently great; conversely, this renders it necessary after having pierced the vein with the needle, to develop a force that is suificiently great to obtain the required change of inclination.

There is therefore a risk of the needle swerving in the vein, thus causing the patient pain and leading to a defective taking of blood.

The present invention concerns an instrument of this kind which obviates the aforesaid disadvantages.

It is characterised essentially by the fact that, in a rubber tube, which connects the test-glass to the needle-carrying tube, there is inserted a ball, preferably made of glass, the diameter of which is greater than that of the orifice of the said rubber tube, so as to stretch the tube on its inside and thus ensure closure thereof, the closing effect being easily eliminated, at the moment of piercing, by simple external squeezing of the said rubber tube, between the fingers, opposite the ball. This squeezing produces in effect, a deformation of the rubber and causes the rubber to slip on the ball, thereby creating two lateral passages around the ball.

It is thus seen that the drawbacks set forth above, of the existing instruments, are wholly eliminated, since the placing of the needle-carrying tube into communication with the testglass and also its subsequent closure are obtained Without the necessity'of changing the position of the said needle-carrying tube in relation to the test-glass. I v In addition to its 'great ease of manipulation, the instrument according to the invention 'is also very easyto manufacture. v

In the foregoing, reference is made more especially to the taking of blood by vacuum created previously inside the test-glass in order to produce therein suction of the blood. ;It can easily be'seen, however, that the same instrument can be applied, without modification, to injections by putting under pressure, in the'test-glass, the liquid to be injected. In contradistinction with the taking of blood for which 'the test glass is first submitted to vacuum before it is sealed, it is necessary in such a case to fill the testglass before sealing it withthel'iquid to be injected, preferably under the pressure of a small amount of a neutral gas. Both the evacuation of the test glass and its filling under pressure may be performed in any suitable manner well known in the art.

According to an embodiment of the invention which is more particularly advantageous although not essential, the rubber tube, which provides the connection between the test-glass and the needle-carrying tube, may be formed, opposite the position' of the ball situated within it, with two opposite enlarged or flat parts, on which the fingers are to be placed, to ensure and facilitate the squeezing of the rubber tube.

The invention consequently covers, as a new industrial product, any sterile instrument for the aseptic taking of blood or injection, in which the closure and temporary opening of the communication between the test-glass and the needlecarrying tube is obtained in the manner herein described.

In order that the invention may be more clearly understood, the same will now be described, by way of example, with reference to the accompanying diagrammatic drawings, in which:

Figure 1 is a part-sectional view of the instrument;

Figure 2 is, on a larger scale, a longitudinal section of the rubber tube in its ball-receiving part; and

Figures 3 and 4 are, on the same enlarged scale, two cross-sections on the line 3-3 of Figure 2 and show respectively the tube in shut-off and open positions.

Referring to the drawings: I denotes the testglass; 2 denotes the rubber tube which is securely mounted thereon by an end-piece 3 also of rubber and integral therewith; 4 is a glass tube which is mounted at the end of the tube 2 and in which is sealed the needle 5 covered by the protecting cap 6.

As shown in Figure 1, the tube 2 is normally straight when the device is held in inclined position or, in other words, is semi-rigid so that the device may be readily manipulated with one hand.

Inserted within the tube 2 is a, ball I which is preferably made of glass and the diameter of which is greater than that of the orifice of the said tube, so as to stretch the tube on its inside by the elastic expansion of the rubber. The arrangement thus ensures the closure-of the tube 2 by eliminating all communication between the test-glass, inside which a vacuum has been previously created, and the needle-carrying tube.

The aforesaid rubber tube 2 comprises on the outside opposite the ball 1, two fiat parts 8 which are 180 apart.

In order to carry out an aseptic blood-taking with this instrument, it is sufficient, after having removed the cap 6. by filing at x-ac and after having piercedthevein with the needle 5,-to take hold of the tube 2 between two ,fingers by its flat parts 8' and to squeeze it, as indicated by the arrows shown in Figure 4;, The rubber is squashed and slideson the ball 1 thereby creating two lateral passages 9 which bring the test-glass l and the needle-carrying tube 4 into communication with each other. The-blood then flows into the test-glass. When the blood-taking is finished, it is sufficient to release the tube 2 which, returning to its original diameter, closes the testglass by means of the ball 1.

In order to remove theneedle from the blood filled test glass after the blood taking is terminated, it is sufficient to break the tube 4 after filing at y--y. Thus the test glass may be sent to a laboratory for analysis under perfectly sterile conditions without it being necessary for it to be accompanied by the needle and associated end of the tube 4.

What I claim is:

A syringe or the like instrument for medical purposes, comprising an ampule, syringe needle, a straight tube of an elastic material secured to the open end of the ampule and the rear end of the needle, respectively, said tube forming a straight, fluid type, semi-rigid connection between said ampule and needle and having part of its length exposed for grasping by the fingers of the operator, and a ball of rigid material having a diameter in excess of the inner diameter of said tube and being seated in the exposed part of the latter, whereby pressure of the operators fingers on the ball creates a temporary deformation of said tube, to increase its inner diameter at right angles to the direction of the pressure and to provide passages for a fluid past the ball.

ANDRE CHARLES MILLARD.

REFERENCES CITED The following references are of record in th file of this patent: 1

UNITED STATES PYA'IENTS

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