Perforator

Details Perforator Perforator

1997-09-17

1999-03-02

Tucker, Guy V.

Surgery

Instruments

Orthopedic instrumentation

A61B 1756

Patent

active

058764054

ABSTRACT:
The drill bit for drilling a hole in bone structure is made to inherently prevent cutting when the resistive force is removed by providing an annular wall with a cutting edge formed on the bottom edge and lying in a plane that is in the circumferential plane of the annular wall and providing a shield in the same plane and disposed adjacent to the cutting edge that is automatically displaced when a resistive load is applied and automatically returns to shield the cutting edge when the resistive load ceases. In one embodiment the wall of the annular wall is judiciously slotted to provide the automatic movement of the shield and in another embodiment the shield is spring load to be displaced and returned to its original position. The perforator of this invention includes safety mechanism that prevents penetration of the perforator when the drill bit has completed the cutting operation and the resistive load is removed. The perforator cuts the hole by an annular slot leaving a plug of the bone structure that is removed and returned to the original hole for re-filling the hole which aids in the healing process. A clutch may be provided that decouples the drill bit from the drive motor upon sensing a void in the drill passage during the drilling operation.

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patent: 5135532 (1992-08-01), Baker
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