Patent ID: 8430825

Claim:
A tissue removal device, comprising: a handpiece having a housing with a first central longitudinal axis; an outer cannula having an outer cannula lumen, a proximal end, a distal end, and an outer cannula opening adjacent the distal end, wherein the opening defines a cutting edge for severing tissue; an inner cannula disposed in the outer cannula lumen and reciprocable within the outer cannula lumen, the inner cannula having an inner cannula lumen, a proximal end, an open distal end, a cutting edge at the distal end; a motor positioned along the first central longitudinal axis, wherein the motor is connected to a cam that is operatively connected to the inner cannula, such that rotation of the motor causes the cam to rotate; wherein the cam has a continuous groove defined in an outer surface thereof and a proximal opening that is in communication with a proximal recess, wherein the groove has at least one pair of apexes, wherein the members of the at least one pair of apexes are spaced apart from one another along the length of the groove and wherein the proximal opening is configured to receive a motor shaft; and a tissue collector in fluid communication with the inner cannula lumen; wherein rotation of the motor causes the inner cannula to reciprocate within the outer cannula lumen along a second longitudinal axis that is axially offset from the first central longitudinal axis.