Surgical drill
First Claim
1. A drill for generating a hole comprising a shank defining a longitudinal axis, a plurality of lips extending radially outwardly from the shank and extending longitudinally in a spiral pattern to form flutes between consecutive lips, each of the flutes defining one side leading to a cutting edge and an opposite side leading to a tail, the one side and opposite side of adjacent flutes cooperating to define a spiral flute therebetween leading to a gap adjacent the cutting edge for the passage of shavings away from the cutting edge during drilling, each lip including a head at one end defining the cutting edge and the tail therefore, the head forming a substantially frusto-conical surface between the cutting edge and the tail, the cutting edge generating shavings during drilling, and the opposite side of each flute at the head extending from the tail toward the associated head cutting edge to substantially form a pocket within the flute for receiving the shavings during drilling in order to readily convey the shavings away from the head as the drill is rotating and generating the shavings.
4 Assignments
0 Petitions
Accused Products
Abstract
A drill includes a plurality of lips with enlarged portions at one end defining heads therefore. The heads form frusto-conical surfaces and cutting edges extend from the frusto-conical surfaces to remove chips. The cutting edges are limited in size with respect to the frusto-conical surfaces to control the removal of chips and a pocket behind each head readily receives the shavings to convey the latter away from the one end.
130 Citations
9 Claims
- 1. A drill for generating a hole comprising a shank defining a longitudinal axis, a plurality of lips extending radially outwardly from the shank and extending longitudinally in a spiral pattern to form flutes between consecutive lips, each of the flutes defining one side leading to a cutting edge and an opposite side leading to a tail, the one side and opposite side of adjacent flutes cooperating to define a spiral flute therebetween leading to a gap adjacent the cutting edge for the passage of shavings away from the cutting edge during drilling, each lip including a head at one end defining the cutting edge and the tail therefore, the head forming a substantially frusto-conical surface between the cutting edge and the tail, the cutting edge generating shavings during drilling, and the opposite side of each flute at the head extending from the tail toward the associated head cutting edge to substantially form a pocket within the flute for receiving the shavings during drilling in order to readily convey the shavings away from the head as the drill is rotating and generating the shavings.
- 8. A drill for generating a hole in a bone comprising a shank with a longitudinal axis, a plurality of lips extending in a spiral pattern along the shank to form spiral flutes, each lip including a cutting edge and a tail at one end of the drill, each lip defining a head at the one end with an enlarged width for the flute to form a frusto-conical surface between the cutting edge and the tail, each frusto-conical surface including the same axis of rotation which is coincident with the longitudinal axis so that only the cutting edge is utilized to remove bone chips during drilling, the cutting edge being formed by a protrusion extending beyond each frusto-conical surface, and each head forms a pocket adjacent the tail and directly behind each frusto-conical surface in direct communication with one of the flutes to provide for removal of bone shavings generated by the cutting edge during drilling.
Specification