Surgery – Instruments – Forceps
Patent
1996-07-03
1997-05-20
Buiz, Michael
Surgery
Instruments
Forceps
606207, 606170, A61B 1728
Patent
active
056308329
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a tubular-shafted surgical instrument comprising two handle parts articulatedly connected to each other, a tube held on one handle part, a tool mounted at the end of the tube, a rod-shaped actuating element for the tool, the actuating element being mounted for longitudinal displacement in the tube and being articulatedly connected to the other handle part via a cylindrical or spherical end, and a releasable connection between tube and actuating element, on the one hand, and the two handle parts, on the other hand, the tube being pushable into a tubular receptacle on the one handle part and axially fixable therein by at least one radially moveable locking body which in an end position enters into a positive connection with the tube, and a retaining member being mounted on the other handle part, the retaining member partly embracing the cylindrical or spherical end of the actuating element in one end position and being moveable into another end position in which the cylindrical or spherical end is removable from the other handle part in the longitudinal direction.
In tubular-shafted instruments of this kind (GB 2 140 735 A), which can be employed in a wide variety of ways, it is important to be able to disassemble the instrument as completely as possible for the purposes of tool exchange and cleaning.
Instruments of this kind, wherein the handle parts can be connected to the tube and to the actuating element via threaded connections, are known. The making and releasing of the connection take a relatively long time as fine threads, which require a large number of turnings, normally have to be used. It is also difficult to connect the concentric parts simultaneously in this way, as two different connections have to be made.
Surgical instruments of the kind described at the outset are already on offer (AESCULAP Main Catalog, 1991 edition, page 647). It is, however, necessary to provide a separate radially protruding part for the fixing, which, under certain circumstances, can complicate the making and releasing of the connection.
The object of the invention is to so design a generic instrument that the making and releasing of the connection between tube and actuating element, on the one hand, and the handle parts, on the other hand, is facilitated, and, in addition, locking and unlocking of the releasable mounting of the tool are also to be facilitated.
SUMMARY OF THE INVENTION
This object is accomplished in accordance with the invention in a surgical instrument of the kind described at the outset by the locking body being a ball, by the radial movement of the locking body being delimited by a stop resting against the outer side of the locking body, the stop being formed by a sleeve axially displaceable on the tubular receptacle, by the sleeve being displaceable relative to the locking body such that the locking body is radially outwardly displaceable to different extents, [locking body . . . radially . . . to different extents], by the sleeve forming a stop for an outer tube which is mounted for axial displacement on the tube and in the pushed forward end position locks the releasable mounting of the tool at the opposite end of the tube, and by the sleeve being displaceable in the direction towards the handle parts in order to release the locking of the tube.
Accordingly, separate, displaceable closure elements which can each be displaced or turned by a movement between a closed position and an open position are used for both the tube and the actuating element, and so the releasing and connecting are very easily effected. In particular, these operations can be carried out very quickly.
The design of the locking of the tube in the one handle part as ball locking mechanism facilitates the making and also the releasing of this connection quite considerably. Ball locking mechanisms are known per se as quick coupling for surgical instruments (WO 91/05514), but these known quick couplings are mainly employed for connecting surgical instruments to holders or ex
REFERENCES:
patent: 4944741 (1990-07-01), Hasson
patent: 5152779 (1992-10-01), Sanagi
patent: 5350391 (1994-09-01), Iacovelli
patent: 5368606 (1994-11-01), Marlow et al.
Giordano Nicola
Morales Pedro
Nesper Markus
Taddia Lino
Weisshaupt Dieter
Aesculap AG
Buiz Michael
Lipsitz Barry R.
Truong Kevin
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