Tracker and related accessories for a surgical navigation system

A surgical instrument adapter for use with a calibration body including a stop and a retention feature, the surgical instrument adapter comprising:

• a proximal member comprising a surgical handpiece interface configured to engage a surgical handpiece and prevent rotation of the proximal member relative to the surgical handpiece;
• a distal member slidably and rotatably coupled to the proximal member;
• a biasing member disposed between the proximal member and the distal member and configured to urge the proximal member and distal member in opposing directions;
• a tracking array mount coupled to the distal member;
• and
• a fastening member disposed on the distal member and configured to removably secure the adapter to the calibration body, the fastening member shaped to matingly engage the retention feature of the calibration body such that the distal member abuts the stop of the calibration body to position the adapter at a known distance from a distal end of the calibration body.

A surgical instrument adapter for use with an end effector including a reference feature and an attachment feature for coupling the end effector to a surgical handpiece, the surgical instrument adapter comprising:

• a proximal member comprising a surgical handpiece interface configured to engage the surgical handpiece and prevent rotation of the proximal member relative to the surgical handpiece;
• a distal member slidably and rotatably coupled to the proximal member;
• a biasing member disposed between the proximal member and the distal member and configured to urge the proximal member and distal member in opposing directions;
• a tracking array mount coupled to the distal member;
• and
• a fastening member disposed on the distal member and configured to removably secure the adapter to the end effector such that the end effector can rotate freely relative to the distal and proximal members,
• wherein the biasing member is configured to be compressed by the reference feature and the surgical handpiece acting upon the distal member and the proximal member when the end effector is coupled to the surgical handpiece, the biasing member creating a friction force between the distal member and the proximal member that resists rotation of the distal member relative to the proximal member, and
• wherein the biasing member is configured to be decompressed when the end effector is decoupled from the surgical handpiece allowing the distal member to rotate freely relative to the proximal member.