Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1994-12-29
1997-01-14
McDermott, Corrine M.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604218, 604228, A61M 5315
Patent
active
055933866
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates primarily to a rod-unit and a piston-unit which are adapted to coact detachably with one another when enclosed in a container so as to form a syringe that can be used only once.
To this end, it is necessary to provide the rod-unit and the piston-unit with means which will enable the units to be mutually connected and disconnected within the container by twisting the rod-unit and the piston-unit relative to one another.
The invention includes two separate methods of assembling a syringe intended for one-time use only, hereinafter referred to as a disposable syringe, which when assembled includes a rod-unit which is arranged for reciprocating movement in relation to a container and whose one end has the form of or coacts with a needle, a piston-unit which coacts with the rod-unit, and means which enable the piston-unit and rod-unit to be mutually connected and disconnected, said rod-unit and piston-unit being formed in accordance with the present invention.
BACKGROUND ART
Several different types of disposable injection syringes are known to the art. A disposable liquid-injection syringe is described in relative detail in International Patent Publication WO89/04677, in which the means used to connect and disconnect the piston and rod of the syringe have the form of screw-like means. The International Patent Publication includes exemplifying embodiments of rod and piston connecting means, where the embodiments illustrated in FIGS. 6 and 9 can be said to represent the closest prior art.
Other types of disposable injection syringes are also known to the art, for instance the syringe described and illustrated in Swedish prior Patent Publication SE-B-7902138-2, Publication No. 438,598.
The injection syringe described and illustrated in European Patent Application EP-A-2,229,017 also forms part of the prior art.
The rod configuration illustrated and defined in FIG. 7 of prior Patent Publication U.S. Pat. No. 5,004,460 also belongs to the prior art.
In addition to what is known from the aforecited publications, mention can be made to the different piston-unit and rod-unit connecting means illustrated and defined in prior publications U.S. Pat. No. 4,906,231 and FR-A-2,381,527 and NO-A-163,263.
The inventive syringe assembly is a development of the disposable syringe and the structural components illustrated and described in International Patent Application PCT/SE92/00258 filed on 21st Apr., 1992, and the reader is referred to this document for a closer understanding of the construction and forms of the rod-unit and piston-unit used in the present case and illustrated in the present Application.
DISCLOSURE OF THE PRESENT INVENTION
Technical Problems
When considering the earlier standpoint of techniques relating to liquid-injection syringes that are intended for one-time use only, referred to here as disposable or non-reusable syringes, it will be seen that a technical problem resides in creating conditions and providing rod-units and piston-units for such syringes in a form which will enable said units to be produced readily in large quantities, particularly by means of plastic moulding techniques or similar techniques, while maintaining a degree of accuracy and mutual conformity between said units which will satisfy the requirement of simple assembly and effective function.
It will also be seen that a technical problem is one of realizing the advantages that are afforded when the rod-unit and the piston-unit are formed as a one-piece structure.
When considering the earlier teachings of International Patent Publication WO89/004677 in particular, it will be seen that another technical problem is one of providing a rod-unit which is provided with a piston-unit connecting and disconnecting means, and a piston-unit which is provided with a rod-unit connecting and disconnecting means and which can both be readily produced in the form of an integrated one-piece structure, where an integrated unit structure is produced by injection moulding in a plastic moulding machin
REFERENCES:
patent: 5032114 (1991-07-01), Olovson
patent: 5059179 (1991-10-01), Quatrochi et al.
patent: 5141495 (1992-08-01), Olovson
Dille Safe AB
McDermott Corrine M.
Rodriguez Cris L.
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