Surgery – Instruments – Forceps
Patent
1995-10-06
1998-10-06
Thaler, Michael H.
Surgery
Instruments
Forceps
606 51, 606 52, A61B 1728
Patent
active
058171282
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to medical tongs, in particular, for use in endoscopic surgery according to the introductory part of claim 1.
Generic medical tongs, in particular, for use in endoscopic surgery are known from the document DE-U-90 07 356. These tongs are provided with a handpiece which has a stationary and a movable handle, a external tube which is connected to the stationary handle, and a draw element guided in a movable manner inside the external tube. This draw element operates at least one of the two tong elements of the jaws of the tongs and is connected to the movable handle.
STATE OF THE ART
The known generic tongs are provided with a handpiece having a stationary and a movable handle. Attached to the stationary handle is an external tube in which a draw-rod is guided in a movable manner which actuates at least one of the two elements of the tongs and is connected to the movable handle.
For a number of reasons, it would be desirable to be able to easily disassemble generic medical tongs, herein only cleaning and sterilization as well as the replacement of defect parts, respectively the upgrading, in particular, of the tong elements will be mentioned. State-of-the-art tongs, however, cannot be disassembled or only with difficulty. Moreover, it is difficult to reassemble disassembled tongs.
Providing medical tongs with a bayonet joint in order to be able to take them apart for cleaning and then easily reassemble them is known from the document DE-U-89 05 099, however these tongs are of another class than the one set forth in the introductory part of claim 1 of the present invention. However, the tongs known from this document have the drawback that the bayonet joint may unintentionally be released during insertion into the human body.
DESCRIPTION OF THE INVENTION
The object of the present invention is to improve medical tongs, in particular, for use in endoscopic surgery according to the introductory part of claim 1 in such a manner that it is easy to disassemble the tongs while at the same time ensuring proper function of the tongs following assembly without requiring additional measures.
A solution to this object according to the present invention is set forth in claim 1. Further improvements of the present invention are the subject matter of claims 2 to 14.
An element of the present invention is that a bayonet element which can be inserted into a bayonet insert inside the external tube and to which at least one of the elements of the tongs is joined is borne at the distal end of the draw-rod in such a manner that it can be moved relative to the draw-rod. The bayonet joint between the external tube and the draw-rod not only ensures easy removal of the draw-rod from the external tube, but the rotary position alignment prescribed by the bayonet action also ensures correct insertion of the draw-rod inside the external tube and secure attachment of the two elements to each other during assembly. The spring clamp element, engaging the draw-rod in a formfitting manner when the handpiece is attached, provided in the external tube ensures that the bayonet joint is not unintentionally released in the assembled state of the tongs.
In a further improvement of the present invention, the external tube containing the inserted draw-rod can be connected to the handpiece via a connection element, with the proximal end of the draw-rod locking into place in a spring catch in the movable handle of the handpiece. This embodiment ensures perfect connection to the handpiece, while retaining all the degrees of freedom, by way of illustration, for the rotation of the external tube containing the inserted draw-rod.
BRIEF DESCRIPTION OF THE DRAWING
The present invention is described by way of example in the following without the intention of limiting the scope and spirit of the present invention using a preferred embodiment with reference to the accompanying drawing to which is expressly referred with regard to the disclosure of all the invented details not made more apparent herein. Sho
REFERENCES:
patent: 2113246 (1938-04-01), Wappler
patent: 2518994 (1950-08-01), Miller
patent: 4258716 (1981-03-01), Sutherland
patent: 4674501 (1987-06-01), Greenberg
patent: 4944093 (1990-07-01), Falk
patent: 5308358 (1994-05-01), Bond et al.
Karl Storz GmbH & Co.
Mon Donald D.
Thaler Michael H.
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