Reciprocating surgical instruments

A system for tissue removal, the system comprising:

• a rotatable hub adapted to be rotated about a rotation axis by a powered rotary handpiece;
• the tissue removal member having a shaft and a working end, the shaft coupled in sliding contact with the rotating member, the working end having a first jaw member and a second jaw member positioned opposite the first jaw member;
• and
• a motion conversion mechanism, the motion conversion mechanism comprising the rotatable hub, a first cam member, a second cam member, and a spherical bearing positioned between the first and second cam members, the second cam member joined to the rotatable hub;
• wherein, during rotation of the rotatable hub about the rotation axis, the second cam is configured to rotate relative to the first cam, and the motion conversion mechanism is configured to urge a reciprocal motion of the shaft along the longitudinal axis, wherein the motion of the shaft is configured to urge at least one of the first and second jaw members to pivot relative to the other jaw member in order to capture tissue between the first jaw member and the second jaw member.

A tissue removal device for being driven by a powered rotary handpiece, the tissue removal deice comprising:

• a longitudinal axis;
• a motion conversion mechanism having a rotating member;
• a tissue removal member having a shaft and a cutting head, the shaft coupled in sliding contact with the rotating member, the cutting head including a first jaw member coupled to a second jaw member, the cutting head actuable between an open position in which a first edge on the first jaw member is spaced apart from a second edge on the second jaw member and a closed position in which the first edge abuts the second edge in order to sever tissue between the first and second edges;
• wherein when the rotating member is rotated about the longitudinal axis, the motion conversion mechanism is configured to urge a translational motion of the shaft along the longitudinal axis, wherein the translational motion consists of a reciprocating translation between a first retracted position and a second extended position;
• and,
• wherein each of the of the first and second jaw members is configured to pivot about a pivot axis to move the cutting head between the open and closed positions.