Cranial perforator with reentrant cutting segment
AssigneeIntech Corporation
InventorJohn W. Baker
Life of this patent
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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.
Claims9
A drilling implement for drilling holes in bone structures comprising, a drill head assembly including inner and outer coaxial drill members with the inner member having at least one drilling flute with a forward cutting edge, and with each cutting edge including a reentrant cutting segment spaced axially rearward from the outer end of said forward cutting edge and extending inwardly toward the axis of said drill members whereby a disk-like configuration from the bone structure is formed as the inner drill penetrates through the bone structure.
A drilling implement for drilling holes in bone structures comprising a drill head assembly, including inner and outer coaxial drill members with the inner member having at least one drilling flute with a forward cutting edge, each said cutting edge including means for cutting a wafer having a disc-like configuration from the bone structure as the inner drill member penetrates through the bone structure by an annular cut.
Dependencies are inferred from the claim text.