Patent ID: 8313444

Claim:
A biopsy device comprising: (a) a probe assembly comprising: (i) a cannula having a closed distal end and a lateral tissue receiving opening spaced proximally from the closed distal end, and (ii) a hollow cutter operable to sever tissue received in the tissue receiving opening; (b) a holster configured to releasably receive the probe assembly, the holster comprising: (i) a first motor operable to impart rotational motion to the cutter, and (ii) a second motor operable to impart translational motion to the cutter; (c) a reprogrammable non-transitory memory operatively associated with the first and second motors, the reprogrammable non-transitory memory including a current profile for each of the first and second motors; and (d) a rotating member operatively associated with at least one motor of the first and second motors, wherein the rotating member has a threaded portion with varying thread pitch.