Cutting burr shank configuration

摘要

A cutting burr that includes a pair of axially spaced diamond-shaped portions designed to be keyed into a spindle of a locking mechanism of a high speed surgical drilling instrument and adapted to fit into a single pawl thereof to lock said cutting burr in place so as to prevent axial movement thereof and provide concentric rotation of said cutting burr without any wobbling. The orientation of both portions may be identical with respect to a center plan and diamond shape in the portion at the proximal end of the shank of the cutting tool may be larger than the intermediately located diamond shape of the other portion. The apexes of the facets of the six-sided diamond shape may be disposed below the surface of the shank of the cutting burr.

主权项

1. A cutting burr having a shank with an engagement end at a proximal end of the shank adapted to be received by a surgical drill, comprising:
a first diamond-shaped portion formed at the proximal end of the shank and having first side edges, the first diamond-shaped portion having a first pair of facets that meet at a first apex and an opposing second pair of facets, wherein the first diamond-shaped portion comprises a flanged portion with tapered surfaces; and a second diamond-shaped portion axially spaced along a shaft of the shank from the first diamond-shaped portion and having second side edges, the second diamond-shaped portion having a third pair of facets that meet at a second apex and an opposing fourth pair of facets, wherein the second diamond-shaped portion comprises a flanged portion; wherein a back wall of the flanged portion of the first diamond-shaped portion is perpendicular to a center line of the shank and faces a front wall of the flanged portion of the second diamond-shaped portion, the front wall being tapered from one of the third pair of facets or the fourth pair of facets to an outside surface of the shank; wherein the first diamond-shaped portion is adapted to be inserted into a complementary shaped mating recess of the surgical drill, and wherein the second diamond-shaped portion is adapted to mate with a complementary locking pawl of the surgical drill.