US1809487A - Hypodermic syringe for injecting liquids into the body or for taking them therefrom - Google Patents

Description

F. MEYER June 9, 1931.

HYPODERMIC SYRINGE FOR INJECTING LIQUIDS INTO THE BODY OR FOR TAKING THEM THEREFROM Original Filed Nov. '7, 1924 IN V EN TOR.' Ejldz/el" Wim/ A T [ORNE YS.

Patented June 9, 1931 UNTED STATES lice FELIX MEYER, OF AACHEN, GERTJIANY HYPODERMIG SYRINGE FOR INJECTING LIQUIIDS INTO THE BODY OR FOR TAKNG- THEM i THEREFROIVI Original application filed November -7, 1924, Serial' No. 748,390, and in Germany May 31, 1924. Divided and this application iiled June 23, 1930. Serial No. 463,260.

This invention relates to hypodermic syringes for injecting liquids into the body or for taking them therefrom.

According to the present invention the syringe is provided with an elastic stopper and a cannula carried by and passing through the said stopper and extending into the interior of the syringe, the part of the cannula projecting therein being opened or closed with respect thereto by moving the stopper irom the outside.

The substance with which the syringe is charged, is under pressure or the syringe contains a vacuum according as to whether the iiuid is to be injected into the body or substance to be drawn therefrom. The injecting into and the drawing from the body are effected with thevaid of a cannula which is inserted into an existing aperture or into an opening to be produced. In the latter case the cannula is fitted with a hollow metal needle preferably fused together therewith. The syringe is closed by a stopper consisting of rubber or of another suitable elastic material which serves as a holder for the cannula. rhis cannula projects partly outside and partly inside the syringe. The part proj e'cting into the syringe is separated from the interior of the syringe by a lid or casing which is only opened when the syringe is to be applied. The opening is eEected from the' outside by moving the elastic .stopper either directly, for instance by pressing, pulling or twisting the same,.or by moving the cannula.

By opening the cannula a connection 1s established between the interior of the syringe and that of the cannula. In order to be able to interrupt the operation, the arrangement is such as to allow the said connection to open 40 and close at will by moving the stopper or the cannula. The part of the cannula projecting into the interior of the syringe may be shaped in such a manner that, when in a state of rest, it presses with its opening so firmly against the elastic stopper, that the opening is thereby closed. By exerting a' lateral pressure directly on to the partl of the stopper projecting outside the syringe or on to the outer projecting part pf the cannula, the opening of its part projecting into the syringe is forced away from the rubber stopper and is closed again when the pressure is released. The cannula is provided with a needle so that when the latter is driven into a blood vessel for instance into a stopped vein, blood will enter into the cannula, the quantity and colour of the blood that has penetrated therein allowing an opinion to be formed as to whether a certain kind of blood vessel has been struck or not. The inner part of the cannula may be so constructed that it is normally completely closed, an opening being produced therein by a portion ofthe said inner part of the cannula being broken off, such breaking being caused also by moving the stopper or the outer part of the cannula. Also in this case the part of the cannula projectinginto the syringe may be so constructed that the opening of the remaining part of the cannula bears against an elastic cover which closes the opening when the stopper is in a certain position.

Referring to the accompanying drawings Figurel shows a syringe for injecting luids into an existing or natural opening of the body. The inner end of the cannula K1 carried by the rubber stopper P1 and projecting into the syringe is bent at a right angle, and the opening of this bent portion bears iirmly againstthe inner wall of the rubber stopper P1. By bendingrthe stopper, the latter and the cannula assume the position indicated in dotted linesv and thecannula K1 is opened to the interior of the syringe. v

Figure 2V shows a similar construction which is however fitted with a hollow metal needle N2 for injecting liquids into the tissue of the body. Szis a sheath enclosing the needle, which sheath is removed when the syringe is to be used. y

Figure 3 shows the same arrangement as Figure 2. The end of the cannula K2 in this construction is provided with a hollow chamber H3 into which the blood can enter and which forms the indicating device hereinbe- 'fore described. The cannula also has a lateral open extension which can be closed and opened with respect to the interior of the. syringe as hereinbefore described.

The hollow chamber H3 forming the indieating device may however be so arranged as to follow directly the hollow needle and to extend partly outside the syringe for instance between the outer end of the stopper and the hollow needle. This modification Whichl is illustrated in Figure 4iand in which IQ. is. the cannula, H4. the hollow cha1nberP.l the stopper and N.l the hollow needle, is ofspecial advantage7 When. an opaque injecting liquid. is used through which the blood cannot be seen.

In Figure 5 the cannula K5 Within the syringe is completely closed and is brok-en at a certain Weak point by moving the stopper P5 so that the end of the cannula. K5 is pressed against the inner Wall of the syringe.

In: Figure G the cannula KG is so shaped that after it has been broken at a` Weak point iu the man-ner described with reference to Figure 5, the opening that is thereby left in thel cannula may be closed from the outside by pressing the cannula against the inner Walll of they stopper P0.

The invention. also relates toa simple process for evaeuating syringes ot the/hind above described. or :tor tillin g them with liquids or gases under pressure. For this purpose a hollow needle F as shown in Figures et and 7 is passed: through thestopper P7 until its end projects into the interior of the syringe. This hollow needle F is connected at its other end toa gasor liquid supply. Thegas contained inI the closed syringe is either drawn oi through thehollow needle F so that a vacuuni is produced therein, or the gas is driven i'ntothe syringe by pressurefso that the latter contains compressed gas, or a liquid is forced into the syringe through the needle F', Whereby the` gas in the syringe is com-pressed,v so tliat whenv they cannula K7 is subsequently openedl to the interior of the syringe the gas,

un consequence of its expansion7 forces the liquid out of the syringe again. After the syringe has been evacuated or lil-led, the hollow needle F is pulled out whereupon the rubber stopper PT automatically closes at the point where it has been pierced.

VVhat I claim is 'n a device of the character described including a needle, a mounting and a transparent container having an internalv pressure different to that of the atmosphere, and adapted for communication With the needle, a frangibl'e capillary tube seal of transparent material forming initially a continuation of the passage through the needle from the innenend of the needle Within said container.

In testimony whereof'r I have signed my name to this speciflication.

FELIX MEYER.

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