Surgical instrument with rotary cutting member and quick release coupling arrangement

An adaptor for use with a surgical dissection instrument having a rotary drive shaft assembly with an axis of rotation and an alignment member, the adaptor comprising:

• a drive train assembly having a first end with a first axis and an opposite second end;
• an alignment channel defined in said first end and extending along the first axis, said alignment channel configured to engage the alignment member of the rotary drive shaft assembly to align said first axis and the axis of rotation;
• and
• a drive surface defined adjacent said first end and configured to couple with the rotary drive shaft assembly, the drive surface facing outwardly from the first axis.

An adaptor for use with a surgical dissection instrument having a rotary drive shaft assembly with an axis of rotation and an alignment member, the adaptor comprising:

• a drive train assembly having a first end with a first axis and an opposite second end;
• an alignment channel defined in said first end and extending along the first axis, said alignment channel configured to engage the alignment member of the rotary drive shaft assembly to align said first axis and the axis of rotation;
• and
• a drive surface defined adjacent said first end and configured to couple with the rotary drive shaft assembly;
• wherein the surgical dissection instrument includes a housing and the adaptor further includes an adaptor housing surrounding the drive trains assembly, the adaptor housing including a locking member for releasably engaging the housing to inhibit longitudinal movement, and
• wherein the locking member is urged to relcasably engage the housing by rotation of the adaptor housing with respect to the surgical dissection instrument housing.