Abstract: A coupling device is used for attaching a dissecting tool to a rotary shaft of a surgical instrument. The device is comprised of a spindle attachment which secures to a spindle of the rotary shaft. The spindle attachment has a shaft engagement portion for engaging the shaft of the dissecting tool. The shaft engagement portion is provided with apertures which terminate within a central bore of the engagement portion through which the tool shaft extends. Surrounding the spindle attachment is a sleeve which has a contact surface which contacts spherical locking members located within the apertures of the shaft engagement portion. A sleeve engagement member is coupled to the base and has an external surface configured to allow a user to grasp the sleeve so that it can be moved between retracted and extended positions. As the sleeve engagement member is moved between the retracted and extended positions, it causes the sleeve to be move to an engaged or disengaged position.

Abstract: A surgical instrument includes a motor, a dissecting tool coupled to the motor for rotation about an axis of the motor, the motor further including a base at one end thereof. The motor is further provided with an elongate member extending from the base and parallel to the motor axis. A foot member extends laterally from a terminal end of the elongate member for protecting selected portions of tissue from exposure to the cutting action of the dissecting tool. The surgical instrument is further provided with indexing means to permit selective rotation of the elongate member relative to base from one of a plurality of angular positions to another of the plurality of angular positions, and to secure the elongate member in a selected angular position.