Surgery – Instruments – Orthopedic instrumentation
Patent
1995-02-14
1996-09-17
Buiz, Michael Powell
Surgery
Instruments
Orthopedic instrumentation
606 79, 606170, 408207, A61B 1732, A61B 1756, A61B 1716
Patent
active
055563996
ABSTRACT:
A coring drill used to harvest bone from a donor area of the human body is described. The drill bit in its preferred embodiment is formed with a cylindrical, hollow shaft and a half-conical tip or cutting head. The cutting head is provided with a sharpened edge which meets at an apex with a non-sharpened edge, forming an obtuse angle of approximately 120.degree.. The sharpened edge is configured to cut into bone when the drill bit is rotated in a clockwise direction, with the apex directed against a section of bone, the cutting edge sheers off fragments of bone which are then drawn upwardly through the hollow shank of the drill bit. As the drill bit is forced downwardly, continuous cutting action occurs and the morselized bone can then be removed, as by use of the described hand tool, from the shank and used to build-up bone in other areas to which it is transplanted. The drill bit in its preferred embodiment fittingly mates on the distal end a fitting that renders the invented drill bit physically compatible with a conventional chuck. The bit includes a pair of diametrically opposed, oppositely inclined recesses that cooperate with a crossbar member within a bit-receiving bore of the fitting. When the aligned drill bit is pressed into the fitting, the crossbar member cams along the inclined recesses causing the bit to rotate relative to the fitting. The resulting frictional engagement between the recesses and the crossbar member, along with a detent assembly between the bit and the fitting, securely lock the bit onto the distal end of the fitting, yet render removal possible by the use of a removal tool that is also described.
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Buiz Michael Powell
Markow Scott B.
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