Patella cutting system

A patella cutting tool comprising a shaft having a longitudinal axis and opposite ends, a boss at one of said ends, a tool collet at the other of said ends, a bore in said boss extending axially of said shaft, a pair of oppositely disposed pins extending from said boss on opposite sides of said bore, a cutting lid, said cutting lid having a top and a bottom, said top of said cutting lid having cutters with cutting edges extending from said top, a pair of first bores oppositely disposed and extending through said cutting lid, said pins in said bores, said cutting edges being staggered to cover the entire area of said top, said lid having debris passages therein, said cutting edges each sweep an area overlapped by other of said cutting edges the total of about one and one-half times, said cutting edges being substantially parallel to said top of said cutting lid, said pins having enlarged distal ends and throat, said bores having an enlarged portion and a smaller portion, said enlarged portion being larger than said distal ends, said smaller portion being larger than said throat and smaller than said distal ends.

A patella cutting tool comprising a shaft having a longitudinal axis and opposite ends, a boss at one of said ends, a tool collet at the other of said ends, a bore in said boss extending axially of said shaft, a pair of pins extending from said boss on opposite sides of said bore, a cutting lid, said cutting lid having a top and a bottom, said top of said cutting lid having cutters with cutting edges extending from said top, a pair of first bores extending through said cutting lid, said pins in said bores and a lock on said pins, said cutting edges being staggered to cover the entire area of said top, said lid having debris passages therein, said cutting edges being substantially parallel to said top of said cutting lid and disposed to cut upon rotation of said shaft, said cutting edges being spirally arranged, said cutting edges upon rotation of said cutting lid about said axis each sweep an area overlapped by other of said cutting edges a total of about one and one-half times, said cutting edges being radial of sald lid.

A patella cutting tool comprising a shaft having a longitudinal axis and opposite ends, a boss at one of said ends, a tool collet at the other of said ends, a bore in said boss extending axially of said shaft, a pair of pins extending from said boss on opposite sides of said bore, a cutting lid, said cutting lid having a top and a bottom, said top of said cutting lid having cutters with cutting edges extending from said top, a pair of first bores extending through said cutting lid, said pins in said bores and a lock on said pins, said cutting edges being staggered to cover the entire area of said top, said lid having debris passages therein, said cutting lid being disk shaped, said cutters extending from said top of said cutting lid angular to said axis a height of about 0.03 inches, said cutting edges being parallel to said cutting lid having length of about 0.25 inches, said cutting edges are radial of said lid, said cutting edges are on radii of about 45.degree. apart.