Patent ID: 8617164

Claim:
A tissue removal device for being driven by a powered rotary handpiece, comprising: a rotary hub having a distal end and a proximal end; a tissue removal member having a distal end comprising a tissue removal surface and a proximal end, the tissue removal member proximal end coupled in sliding contact with the rotary hub; and a motion conversion mechanism comprising a housing, a cam surface and a cam follower surface, wherein the cam follower surface comprises at least one hollow complementarily fitting at least one lobe of the cam surface; wherein when the rotary hub is rotated about an axis, the motion conversion mechanism urges motion of the tissue removal member along the axis, wherein the motion consists of reciprocating translation of at least the distal end of the tissue removal member between a first retracted position and a second extended position, wherein in the first extended position the cam follower surface and the cam surface are flush; the housing disposed around a portion of the tissue removal member and a portion of the rotary hub, the housing having a proximal end, a distal end and the cam surface facing proximally; wherein the rotary hub distal end terminates in a distal end face, the distal end face comprising the cam follower surface; the tissue removal member further comprising: a shaft key comprising a proximal groove on the outside of a key body, wherein the proximal groove engages a ring for retention within the rotary hub, the shaft key further comprising distal wings configured to fit into recesses of the housing, wherein the distal wings of the shaft key cooperate with the recesses of the housing to prohibit rotary motion of the tissue removal member.