Patent ID: 8617085

Claim:
A bone tissue extracting device, comprising: a driver portion comprising a handle; a motor; a user-operated motor actuator for controlling the motor; a driven gear; a drill portion; the drill portion adapted to fit into the driver portion, comprising a hollow, elongate cannula having a proximal end and a distal end, the cannula comprising a first means for piercing a frangible seal at the proximal end; a cannula gear engaged near the proximal end to co-rotate coaxially with the cannula, the cannula gear located on a distally facing surface of the proximal end, the cannula gear adapted to mesh with the driven gear; and an elongate trocar having an upper end and a lower end and shaped to fit slidably and coaxially into, and removably from, the cannula; the upper end of the trocar comprising a cap; the cap having a center and a periphery; the center being attached to the upper end of the trocar; the cap covering the first means for piercing a frangible seal at the proximal end of the cannula; the periphery being directly and removably connected to the cannula gear so that when the removable connection is actuated, the trocar can be removed from the cannula; the drill portion being rotatable by the motor through operation of the user-operated motor actuator, thereby allowing a user of the device to advance and withdraw the cannula into and out of the bone tissue of a patient.