Surgery – Instruments – Cutting – puncturing or piercing
Patent
1995-11-17
1996-12-17
Buiz, Michael Powell
Surgery
Instruments
Cutting, puncturing or piercing
606208, A61B 1732
Patent
active
055848443
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an instrument for surgical purposes with two working parts displaceable relative to one another and two gripping arms pivotal relative to one another, one of these arms being connected to one working part and the other to the other working part such that during closing and opening, respectively, of the gripping arms the two working parts are displaced relative to one another, with one of the two gripping arms bearing a bearing shaft for the pivotal mounting of the other gripping arm which, for its part, engages the one working part with an entraining element.
Such instruments are used, for example, in so-called tubular shaft instruments or in surgical punches, in which two working parts which are displaceable parallel to one another are displaced via the two gripping arms. For this purpose, the gripping arms, which project essentially vertically to the longitudinal extension of the working parts, are pivotally connected to one another; they are mounted by means of a bearing shaft on one gripping arm. An articulated connection is provided, in addition, between one of the two gripping arms and one working part so that the pivotal movement of the gripping arm can be converted into a translational movement of the working part (U.S. Pat. No. 3,814,102).
The object of the invention is to design an instrument of this type such that the individual parts are easy to disassemble, for example, for the purpose of cleaning, despite this relatively complicated construction.
SUMMARY OF THE INVENTION
This object is accomplished in accordance with the invention, in an instrument of the type described at the outset, in that the shaft has regions of different diameters and is displaceable such that either a region with a larger diameter or a region with a smaller diameter is operative in the region of the other gripping arm, that the other gripping arm has an insertion slot widening in the shape of a keyhole and having a narrower slide-in section and a widened bearing section for the shaft, the width thereof in the narrower slide-in section being between the diameters of the two regions of the shaft and in the circularly widened bearing section having a diameter corresponding to the larger diameter of the shaft.
A construction of this type enables a secure mounting of the two gripping arms to be achieved in that the shaft engages in the widened bearing section of the entraining element with the region having a greater diameter. In this region, the displaceable working part is taken along by the entraining element. To detach the parts it is sufficient to move the bearing shaft such that the region with a smaller diameter is operative at the widened bearing section of the insertion slot; the gripping arm can then be guided along the shaft with the insertion slot so that the entraining element thereby leaves its operative connection with the working part. As soon as the shaft has left the insertion slot, a complete separation of the gripping arm takes place, on the one hand, from the other gripping arm and, on the other hand, from the entrained working part which can then easily be separated from the other working part by way of further displacement. In order to achieve this separation and, in the reverse case, a securing of the gripping arms on one another, it is sufficient for the shaft to be moved such that alternatively the regions with a larger or a smaller diameter become operative on the other gripping arm.
In this respect, it is advantageous for the shaft to be displaced under spring loading into a position, in which the region with a larger diameter is operative on the gripping arm mounted on the shaft. This is the normal working area, in which the gripping arms are mounted on one another so as to be pivotal. The shaft can be moved into a position, in which it is possible to separate the two gripping arms, only contrary to the action of this spring. When the shaft is released, the shaft will automatically be moved, once the two gripping arms have been fitted toge
REFERENCES:
patent: 3777538 (1973-12-01), Weatherly et al.
patent: 3814102 (1974-06-01), Thal
patent: 4043343 (1977-08-01), Williams
patent: 4369788 (1983-01-01), Goald
patent: 4440170 (1984-04-01), Golden et al.
patent: 5336236 (1994-08-01), Holmes et al.
patent: 5368606 (1994-11-01), Marlow et al.
patent: 5385570 (1995-01-01), Chin et al.
Aesculap AG
Buiz Michael Powell
Lipsitz Barry R.
Truong Kevin
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