Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1986-03-10
1988-04-19
Pellegrino, Stephen C.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604205, 604191, 604157, A61M 500
Patent
active
047386606
DESCRIPTION:
BRIEF SUMMARY
The invention relates on the one hand to an injection syringe having at least two chambers which are disposed in juxtaposed and axis-parallel relationship, and an injection needle whose needle cavity can be connected to a chamber for an injection liquid which can be put under pressure by a syringe piston which can be put under load, and on the other hand to an injection syringe having an injection needle which can be pushed out of a needle chamber from a readiness position into an operative position by a force storage means, and a closed container which is disposed in axis-parallel relationship with the needle chamber and which accommodates an injection fluid that can be put under pressure by a syringe piston which can be put under load, the injection needle of the syringe, which has a needle duct, being connected in the operative position to a liquid chamber of the container.
In his patent application No. P 29 32 719.3 the inventor put forward an injection syringe of that kind, with which it is possible for the time delay between the operation of pushing out the injection needle and the beginning of the injection to be longer than in the case of known syringes. With the previously known needle, that is achieved in that the needle chamber and the container extend in axis-parallel relationship, and that the injection needle is connected by way of a lateral opening associated therewith, and an outlet aligned therewith in the operative position in a wall of the liquid container, wherein the syringe piston for pressurising the liquid and the needle piston are released by a lift means which delays the release of the syringe piston with respect to the needle piston.
A further improvement in such injection syringes is intended to permit a simplification in the syringe structure, selectively also manual operation of the syringe piston, and mixing of a plurality of syringe liquids during the injection process.
That object is attained in that the juxtaposed chambers are each provided with a syringe or injection piston and communicate with a common prechamber which is formed by a releasable cap carrying the injection needle.
It is also in accordance with the invention that the juxtaposed chaxbers are respectively provided with a syringe or injection piston and are provided at one end with a ccmmon cap carrying the injection needle, wherein the injection needle, in the inside of the cap, has a number of contact ends, said number corresponding to the number of chambers, which contact ends can be applied against bottom portions of the injection syringe and can be pushed thereinto by means of the cap.
That arrangement which is further supplemented by the features set forth in the subsidiary claims provides a very simple syringe instrument which achieves the object envisaged.
In accordance with the invention, another way of achieving the object of the invention provides that the liquid chamber has a projection portion or formation which projects towards the needle chamber and into which a pin-like part of the injection needle extends in the operative position; in accordance with the invention same is to be of a U-shaped configuration, with a long limb as the injection tip and with a short limb as the pinlike part; the entire injection needle is provided with the needle duct extending therethrough.
An essential aspect in regard to the injection syringe according to the invention is the stop lever which is described in German laid-open application (DE-OS) No 29 32 719 and which is formed for example as a rocker member.
The stop lever makes it possible for firstly the injection needle to be set in motion and for the injection piston to be moved only when the injection needle has reached its operative position.
It is also in accordance with the invention that resting on the syringe piston is a pressure plate or a corresponding piston disc with axial piston barrel in which an externally accessible piston rod of the injection piston is displaceably mounted and which is held by a stop member in the readiness position. That makes
REFERENCES:
patent: 1561854 (1924-08-01), Hein
patent: 4040420 (1977-08-01), Speer
patent: 4109653 (1978-08-01), Kozam
patent: 4178928 (1979-12-01), Tischlingler
patent: 4359049 (1982-11-01), Redl et al.
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