| 主权项 |
1. A tissue removal device, comprising:
a handpiece disposed along a first central longitudinal axis and housing a motor and a cam having a shaft along the first central longitudinal axis, wherein the motor is operatively connected to the cam such that when the motor rotates, the cam rotates; an outer cannula having an outer cannula lumen, an outer cannula proximal end, an outer cannula distal end, and an outer cannula opening adjacent the outer cannula distal end, wherein the outer cannula opening defines a cutting edge for severing tissue, wherein the outer cannula is arranged along a second longitudinal axis that is axially offset from the first central longitudinal axis; an inner cannula disposed in the outer cannula lumen and reciprocable within the outer cannula lumen along the second longitudinal axis, the inner cannula having an inner cannula lumen, an inner proximal end, an open inner distal end, and a cutting edge at the inner distal end; a cam transfer having a first end and a second end, wherein the first end of the cam transfer engages the cam and the second end engages the inner cannula, so as to space the inner cannula laterally from the first central longitudinal axis, wherein when the cam rotates in a first direction, the cam transfer reciprocates along an axis that is parallel to the second longitudinal axis to reciprocate the inner cannula; an inner cannula stop position control system comprising an inner cannula position sensor and a motor control unit; and a cam follower having an hollow interior into which the shaft of the cam is partially received. |
