Surgery – Instruments – Forceps
Patent
1996-05-31
1997-07-22
Buiz, Michael
Surgery
Instruments
Forceps
606206, A61B 1728
Patent
active
056499582
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an instrument for surgical purposes comprising two working parts displaceable relative to each other and two handle branches pivotable relative to each other, one of the handle branches being connected to the one working part and the other to the other working part such that when closing and opening the handle branches, the two working parts are displaced relative to each other, and one of the two handle branches carrying for pivotable mounting of the other handle branch a bearing shaft, which has regions of different diameter and is axially displaceable such that in the region of the other handle branch a region of larger or a region of smaller diameter is selectively effective, and the other handle branch having a slot for the bearing shaft with a narrower central section and a widened bearing section at one end, the width thereof in the narrower central section lying between the diameter of the two regions of the bearing shaft and having in the circular, widened bearing section a diameter which corresponds to the larger diameter of the bearing shaft, and one of the two handle branches entering articulatedly with a driver into engagement with the one working part when the bearing shaft extends through the widened bearing section.
Instruments of this kind are widely used in the surgical sector, for example, in the form of so-called tubular shaft instruments or biopsy forceps, etc. In order to dismantle these instruments for cleaning purposes and to exchange parts, it is necessary to release the connection between the working parts, on the one hand, and the handle branches, on the other hand. In particular, with very small instruments this is partly rather complicated, as reliable connections are necessary for the transmission of the high forces and are not easily released.
Such instruments are known wherein the operative connection between a handle branch and a displaceable working part is released by the handle branch being designed so as to be longitudinally displaceable in its bearing on the other handle branch so that with the longitudinal displacement, the engagement with the working part is released (DE-U-93 07 622). However, the design thereof is chosen such that upon release of the operative connection between a handle branch and a moved working part, the handle branches are automatically completely released from one another, i.e., the entire instrument is disassembled.
The object of the invention is to further develop a generic instrument such that release of the operative connection between handle branch and working part is possible without complete disassembly of the instrument in the region of the handle branches being necessary.
SUMMARY OF THE INVENTION
This object is accomplished in accordance with the invention in an instrument of the kind described at the outset in that there is arranged at the other end of the central section another widened bearing section with a likewise widened diameter, and in that the driver disengages the working part when the bearing shaft extends through this other widened bearing section.
Two bearing positions are thus provided in which the handle branches are articulatedly connected to each other, and between these two bearing positions the two handle branches can be displaced relative to each other, with engagement with the working part occurring in one bearing position, and not in the other bearing position. With this construction, it is ensured that the handle branches always remain articulatedly connected to each other, also when the operative connection with the working part is released.
It is advantageous for the shaft to be displaced under spring load into a position in which the region of larger diameter is effective at the handle branch mounted on the shaft. It is thereby ensured that the shaft is normally pushed into one of the two end bearing positions so that the handle branches are mounted on each other in a properly guided way. For displacement between the two positions and passage through th
REFERENCES:
patent: 4369788 (1983-01-01), Goald
patent: 4712545 (1987-12-01), Honkanen
patent: 5507774 (1996-04-01), Holmes et al.
patent: 5522830 (1996-06-01), Aranyi
Grimm Holger
Hebestreit Klaus
Morales Pedro
Aesculap AG
Buiz Michael
Lipsitz Barry R.
Truong Kevin
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