Reciprocating surgical instrument

摘要

A surgical rasping and/or shaving system functions in multiple orthopedic applications, including but not limited to shoulder, knee, hip, wrist, ankle, spinal, or other joint procedures. The system may comprise a tissue removal member with a rasping and/or shaving head which may be low profile and offer a flat cutting/rasping/shaving surface, or with a cutting head with at least one cutting edge. The tissue removal member is configured to be driven by an attached hub that translates a rotational movement into a reciprocating motion. Suction for removal of bone fragments or other tissues is provided through an opening spaced apart from or adjacent to the rasping surface. A radiofrequency ablation (RF) electrode may be carried on the system to provide ablation or coagulation of soft tissues.

主权项

1. A tissue removal device comprising:
a first cam, wherein the first cam comprises an undulating cam surface; a hub axially fixed to the first cam, wherein the hub is rotatable relative to the first cam about an axis of rotation; a second cam between the hub and the first cam, wherein the second cam is rotationally fixed to the hub, wherein the second cam is axially slidable relative to the hub along the axis of rotation, wherein the second cam comprises an undulating cam surface; a translation member comprising a distal working member and an opposite proximal portion, wherein the translation member is rotationally fixed to the first cam, wherein the translation member is axially slidable relative to the first cam along the axis of rotation, wherein the translation member is axially fixed relative to the second cam, wherein the translation member is rotatable relative to the second cam about the axis of rotation; and, wherein, during rotation of the hub about the axis of rotation, the second cam rotates with the hub relative to the first cam, wherein the cam surface of the first cam and the cam surface of the second cam cooperate to convert rotation of the hub and second cam to reciprocating translation of the second cam and the translation member relative to the first cam along the axis of rotation, and the second cam and the translation member thereby undergo reciprocal translation relative to the first cam along the axis of rotation.