Surgical drill collet mechanism and bur

Details Surgical drill collet mechanism and bur Surgical drill collet mechanism and bur

1992-07-06

1993-06-29

Brown, Michael A.

Surgery

Instruments

Orthopedic instrumentation

A61B 1756

Patent

active

052229564

ABSTRACT:
A surgical drill uses burs with circular grooves about the circumference that are polygon shaped in cross section but curved along the length of the bur so as to accept locking balls therein. The burs slide within a tubular drive shaft that has transverse holes therein to guide the locking balls. A cylindrical cam surrounds the drive shaft and the locking balls to urge the balls radially inward into the bur groove. The cam is spring loaded axially. A spring loaded central pin within the drive shaft slides between the balls and urges the balls radially outward when no bur is inserted. A thumb button is used to disengage the ball surrounding cam.

REFERENCES:
patent: 1636421 (1927-07-01), Knott
patent: 4007528 (1977-02-01), Shea
patent: 4014099 (1977-03-01), Bailey
patent: 4055185 (1977-10-01), Waldron
patent: 4378212 (1983-03-01), Waldron
patent: 4661062 (1987-04-01), Seigneurin
patent: 4728292 (1988-03-01), Lustig
patent: 4940410 (1990-07-01), Apap
patent: 5028181 (1991-07-01), Jenkins
patent: 5037299 (1991-08-01), Nakanishi

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