Tool bit for a motor driven surgical instrument

Details Tool bit for a motor driven surgical instrument Tool bit for a motor driven surgical instrument

1994-10-07

1997-02-11

Tucker, Guy V.

Surgery

Instruments

Orthopedic instrumentation

606180, 408231, A61B 1756

Patent

active

056015607

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: 5055105 (1991-10-01), Hamlin et al.
patent: 5129907 (1992-07-01), Heldreth et al.
patent: 5180384 (1993-01-01), Mikhail
patent: 5219174 (1993-06-01), Zurbrugg et al.
patent: 5330480 (1994-07-01), Meloul et al.

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