Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1993-10-13
1995-06-13
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604218, 604228, A61M 550, A61M 500
Patent
active
054237572
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a syringe, and then particularly to a disposable syringe intended for one-time-use only.
The invention particularly pertains to the rod and the piston that forms part of the syringe and to the use of a special coupling or a special means for controlling coaction between these syringe components.
The present invention relates to, or encompasses, a rod which forms part of a syringe intended for the injection of a liquid. A syringe of this kind comprises a container a needle, a piston and the aforesaid rod, and also a means for connecting and disconnecting the piston to and from the rod.
Thus, the invention relates particularly to the configuration of the rod and to the configuration of a means which connects and disconnects the rod to and from the piston, said rod being intended to form part of a syringe with which said means shall be brought to a connecting or coupling state when the piston is initially withdrawn by the rod from a position close to the needle to a position in which it is distanced from the needle, and is brought to a disconnected or uncoupled state when the piston is urged forwards by the rod through an adapted, small distance in a direction towards the needle.
The invention constitutes a further development of a previously known rod which forms part of a syringe intended for the injection of a liquid, wherein the rod is intended to coact with the container in a manner to twist the rod when it is moved in relation to the container, and wherein, in order to form said means, that part of the rod which faces towards the needle is provided with support surfaces which are intended to coact with opposing support surfaces on the piston.
The present invention also relates to, or encompasses, a piston which forms part of a syringe intended for the injection of a liquid. This syringe is comprised of a container, a needle, the piston and a rod, and also a means which functions to connect and disconnect the piston to and from the rod.
Thus, the invention relates particularly to the configuration of the piston, and particularly to the configuration of the aforesaid piston connecting and piston disconnecting means intended to form part of a syringe in which said means is intended to be brought to a connecting or coupling state when the piston is withdrawn by the rod from a position in which it is located close to the needle to a position in which it is distanced from said needle, and to be brought to a disconnected state when the piston is urged by the rod through an adapted, small distance in a direction towards the needle.
The invention constitutes a further development of a previously known piston which forms part of a syringe intended for the injection of a liquid, wherein the piston is intended to coact with the container in a manner such as to be moved rectilinearly when the piston is moved relative to the container by a twistable rod, and wherein, for the purpose of forming said connecting and disconnecting means, that part of the piston remote from the needle is provided with support surfaces which are intended to coact with opposing support surfaces on the rod.
BACKGROUND OF THE INVENTION
A disposable syringe for liquid injection on which the present invention can be said to be based is described in detail in the U.S. Pat. No. 5,032,114, which illustrates a syringe of the kind described in the introduction and with which the means which functions to connect and disconnect the piston to and from the rod has a screw thread configuration. The embodiments of the rod disconnecting and connecting means described in this international patent application in FIGS. 6 and 9 can be said to constitute the closest relevant prior art.
Other disposable injection syringes are also known to the art, for instance the syringe described and illustrated in Swedish Patent Publication SE-B-79 02138-2, publication No. 438 598.
The injection syringe described and illustrated in the European Patent Publication EPA2-0 229 017 also forms part of the prior art.
Also formin
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patent: 5032114 (1991-07-01), Olovson
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Helldin Nils G.
Olovson Gudmar
Cermak Adam J.
Yasko John D.
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