Surgical handpiece system for depth measurement and related accessories

A surgical handpiece system comprising:

• a handpiece assembly comprising,
• a handpiece housing assembly having a proximal region and a distal region, and
• a drive cannula rotatably coupled to the handpiece housing assembly and configured to receive torque from a motor and rotate in response thereto, the drive cannula extending along a longitudinal axis between a proximal end and a distal end, and the drive cannula comprising,
• an external surface comprising a driven portion adjacent the proximal end configured to receive torque from the motor,
• an internal surface defining a bore that extends along the longitudinal axis, the internal surface comprising a first driving portion adjacent the proximal end, and
• a distal protrusion adjacent the distal end comprising a second driving portion;
• a surgical end effector moveable to an engaged position wherein the surgical end effector is at least partially received in the bore of the drive cannula such that a proximal end of the surgical end effector is positioned to receive torque from the first driving portion and a distal end of the surgical end effector extends from the handpiece housing assembly;
• and
• a surgical attachment module having a drive shaft, the surgical attachment module configured to be coupled to the handpiece housing assembly adjacent the distal region such that the drive shaft of the surgical attachment module is coupled to the distal protrusion and the surgical attachment module is configured to receive torque from the second driving portion, wherein the first driving portion is geometrically different from the second driving portion.