Surgery – Instruments – Orthopedic instrumentation
Patent
1995-09-20
1997-05-20
Tucker, Guy V.
Surgery
Instruments
Orthopedic instrumentation
606180, 408231, 279 77, A61B 1756
Patent
active
056308183
ABSTRACT:
A surgical instrument has a housing which contains a motor that drives a spindle. A tool bit is attached to the motor by a holder that includes a body with a first end portion connected to the spindle, a central portion with a cavity therein, and a second end portion having an aperture through which a shaft of the tool bit passes into the cavity. A pair of lock pawls are pivotally mounted in the cavity with each one having a first tab that enters a slot in the shaft when the lock pawls are in a first position to hold the tool bit in the instrument. The first tabs retract from the slot when the lock pawls are in a second position for changing the tool bit. The lock pawls have second tabs that engage a restrainer only in the second position to prevent the body from rotating. A ring extends around the body and pivots the lock pawls between the first and second positions when the ring moved longitudinally along the body. A manually operable shift lever is pivotally coupled to the housing and move the ring longitudinally along the body.
REFERENCES:
patent: 4978350 (1990-12-01), Wagenknecht
patent: 5219174 (1993-06-01), Zurbrugg et al.
Anspach, Jr. William E.
del Rio Eddy H.
The Anspach Effort, Inc.
Tucker Guy V.
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