Tetherless biopsy device with self-reversing cutter drive mechanism

A biopsy device, comprising:

• (a) a body;
• (b) a needle extending distally from the body, wherein the needle is configured to receive tissue;
• (c) a cutter, wherein the cutter is configured to translate relative to the needle, wherein the cutter is configured to sever tissue received by the needle;
• (d) a motor laterally offset from a longitudinal axis of the cutter, wherein the motor is operable to rotate the cutter in a first direction;
• and
• (e) a self-reversing cutter translation assembly operable to translate the cutter in a distal direction and in a proximal direction in response to rotation of the cutter in the first direction.

A biopsy device, comprising:

• (a) a body;
• (b) a needle extending distally from the body;
• (c) a cutter, wherein the cutter is configured to translate relative to the needle, wherein the cutter is configured to sever tissue, wherein the cutter is operable to rotate in a first direction;
• (d) a valve assembly;
• and
• (e) a self-reversing cutter translation assembly;
• wherein rotation of the cutter in the first direction is operable to provide translation of the cutter distally and proximally;
• and
• wherein engagement between a portion of the valve assembly and a portion of the cutter translation assembly is operable to reverse the direction of translation of the cutter.