Cranial perforator with reentrant cutting segment
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United States of America Patent
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-
Dec 5, 1989
Issued Date -
N/A
app pub date -
Sep 30, 1985
filing date -
Jan 31, 1984
priority date (Note) -
Expired
status (Latency Note)
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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 leading inner drill has at least one drilling flute with a forward cutting edge including a reentrant cutting segment axially rearward from the outer end of the forward cutting edge and extending inwardly towards the longitudinal axis of the perforator.
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