Patent ID: 9033986
Filing Date: 2015-05-19
Classification: A61B,A61M

Abstract:
1. A system for tissue removal, the system comprising: a rotatable member adapted to be rotated about a rotation axis by a powered rotary handpiece; a tissue removal member comprising a shaft extending longitudinally between a proximal end and a distal end, the shaft coupled to the rotatable member, a cutting head formed on the distal end of the shaft, at least one cutting edge formed on the cutting head; and a motion conversion mechanism, the motion conversion mechanism comprising the rotatable member, a first cam member comprising an annular first cam surface, a second cam member, and a spherical bearing member separate from the first and second cam members and positioned between the first and second cam members, the second cam member joined to the rotatable member; wherein the first cam member comprises a plurality of high points defined by the annular first cam surface, wherein the plurality of high points comprise at least one recessed dimple at least partially receiving the spherical bearing member, wherein during rotation of the rotatable member about the rotation axis, the second cam member rotates relative to the first cam member, and the motion conversion mechanism urges reciprocal translation of the tissue removal member along the rotation axis, wherein the cutting head is translated between a first retracted position and a second extended position.