Cranial perforator

Details Cranial perforator Cranial perforator

1987-03-26

1989-02-14

Thaler, Michael H.

Surgery

Truss

Pad

1283051, 408139, A61B 1716

Patent

active

048039829

ABSTRACT:
A new drill-type cranial perforator is disclosed of the type which comprises a front drill head assembly made up of a leading inner drill and a trailing outer drill, and a rear support and drive assembly adapted to enable both drills so long as the leading inner drill is encountering a resistive surface and to disable both drills when the leading inner drill stops encountering the resistive surface. The inner drill is coupled to the outer drill and to the rear support and drive assembly by a plurality of lugs, each of the lugs having a cam surface, and the outer drill includes a plurality of drive surfaces which coact with the cam surfaces. The new perforator is characterized by cam surfaces which are beveled outwardly toward an outer surface of the inner drill member in a helical twist, with the degree of bevel increasing progressively along the length of the cam surface.

REFERENCES:
patent: 2842131 (1958-07-01), Smith
patent: 4456010 (1984-06-01), Reimels et al.
patent: 4600006 (1986-07-01), Baker

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