Chuck for reciprocating surgical instrument

A system for treating a tissue structure during a surgical procedure, comprising:

• a reciprocating surgical instrument, comprising:
• a motor having a rotatable spindle;
• a transmission mounted to the spindle for converting rotating movement of the spindle to reciprocating movement;
• a surgical tool chuck coupled to the transmission, the chuck comprising:
• a receiving shaft defining a longitudinal axis and having a tool receptacle and a radially extending proximal opening;
• a locking member slidingly coupled to the receiving shaft, the locking member having a protrusion extending therefrom;
• a camming sleeve rotatingly retained on the shaft, the camming sleeve having an internally cammed surface;
• and
• a rotation maintaining mechanism configured to maintain the camming sleeve in a position maintaining the protrusion in a second position;
• and
• a first surgical tool and a second surgical tool both having a distal end and a proximal end, the proximal end configured to be received into the tool receptacle, the surgical tool having an aperture disposed to correspond with the radially extending proximal opening of the receiving shaft when the surgical tool is disposed in the tool receptacle, wherein the locking member is selectively moveable between a first position and a second position, the first position wherein the protrusion is withdrawn from the proximal opening of the receiving shaft to allow insertion and removal of the surgical tool, the second position wherein the protrusion is substantially received within the proximal opening of the receiving shaft and the aperture in the surgical tool to secure the surgical tool within the chuck, the cammed surface configured to urge the protrusion into the second position;
• wherein the tool receptacle comprises a cylindrical bore in the shaft to receive the first surgical tool having a substantially cylindrical shank, and
• wherein the tool receptacle further comprises a transverse slot extending through opposing sidewalls of the shaft configured to receive the second surgical tool having a substantially flattened shank, where the substantially flattened shank is flattened relative to the substantially cylindrical shank.