Medical instrument for removing bone

Claim 1

A medical instrument for cutting and removing bone comprising: a rigid barrel member having a cutting edge defined at one extremity thereof; a shaft member positioned coaxially within said barrel member and arranged for reciprocal motion therein, said shaft member having a plate member mounted at one extremity thereof transverse to said shaft member and a defined cavity proximate to said plate member; and lever means for reciprocally translating said shaft member within said barrel (a) to cause said plate to reciprocate with respect to said barrel trapping said bone between said cutting edge and said plate and (b) to cause said cavity to reciprocate with respect to said barrel capturing bone severed by said cutting edge within said cavity; said reciprocal translation of said shaft member within said barrel defining an open position and a closed position of said medical instrument; said closed position being defined by said plate transversely abutting said cutting edge and said open position being defined by said plate being spaced from said cutting edge such that as said medical instrument is moved from said open position to said closed position, said plate is brought into abutting contact with said cutting edge; said barrel remaining stationary while said medical instrument is moved between said open position and said closed position.