Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1981-04-13
1983-05-24
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604136, A61M 500
Patent
active
043845797
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a hypodermic syringe having within its housing a receiving chamber for an injection liquid which can be placed under pressure by a piston or the like and having a hypodermic needle. Disposable syringes of this type are known in which the needle must be screwed onto the syringe in order to make it operable. The injection liquid is taken from ampules and aspirated into the syringe. The handling of such syringes is hygienically unobjectionable and furthermore it is time-consuming.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a hypodermic syringe of the aforementioned type which can be used immediately and satisfies all hygienic requirements. It is another object that the hypodermic syringe be simple to manufacture and so inexpensive that it can be used as a disposable syringe.
In order to achieve this purpose, the hypodermic needle is arranged in a needle chamber which is associated with the reception chamber for the injection liquid and the needle can be displaced by a piston or the like from the needle chamber and can be connected with the receiving chamber in an operating position.
It also resides within the scope of the invention to provide the injection needle with an inner space which widens out conically in the direction opposite the direction of the thrust of the piston and to arrange the needle within the injection liquid; furthermore, the needle is to be developed in such a manner that it can be transferred by the piston from the receiving chamber into an operating position. In this case the needle of the hypodermic syringe of the invention preferably lies within a cylindrical space in which the needle attached to the piston can be displaced by the force of a force accumulator and thereby emerges from the cylinder so as to assume the so-called operating position. The needle therefore comes out of its covering only when it is to be used and cannot be contaminated previously. This is true also in the case of the hypodermic needle which was first mentioned, in which the needle itself is arranged in a space separate from the liquid but completely covered and is filled with liquid only in the operating position.
It has proven particularly favorable to arrange the injection needle in a bag which preferably contains the injection liquid. The tip of the needle perforates this bag when the needle is brought into the operating position and therefore when pressure is exerted on the piston.
The piston which, in accordance with the invention, bears the needle and closes off the top of the liquid chamber is also under the pressure of a force accumulator in the same way as the other piston which is provided merely for the guidance of the needle and adjoining which, in accordance with another feature of the invention, a further piston for the ejection of the liquid is present in a neighboring space. The force accumulators are under tension in the position of rest of the syringe of the invention and are held by locking or closure elements which must be capable of operation in simple manner. For this there has proven to be particularly favorable a locking plate having a keyhole-like cutout which holds a head of a separate push piston. This push piston holds the force accumulator, developed as a coil spring, fast in its force-accumulation position so that this part of the syringe can be removed from the rest of the syringe without the danger of relaxation of the spring. It is also possible to make separate use again of this part of the syringe, which in accordance with the invention is arranged in a protective cap.
In the case of the hypodermic syringe with separate needle and liquid chambers there may also be used, in accordance with the invention, a lever system which on the one hand holds a detent member of the needle piston or the push bolt and on the other hand the piston for the liquid fast, in which case--in accordance with another feature of the invention--the liquid piston is developed so that it can be released from the
REFERENCES:
patent: 3572336 (1971-03-01), Hershberg
patent: 4114619 (1978-09-01), Wagner
patent: 4284077 (1981-08-01), Wagner
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