Patent ID: 7879056

Claim:
An expandable abrading device, comprising: a. a handle having a hollow interior, a proximal end, and a distal end; b. a cannula, having a hollow interior, a proximal end and a distal end, with a proximal opening proximate said proximal end and a distal opening proximate said distal end, said proximal end being joined to said handle with said proximal opening joining said hollow interior of said handle; c. an adjuster, having a hollow interior, said adjuster being slidably located within said hollow interior of said handle; d. an actuator, slidably located within said hollow interior of said adjuster, said actuator having a passage; e. an inner tube attached to said actuator and extending through said hollow interior of said cannula, said inner tube having a proximal end attached to said actuator and a distal end distal to said actuator; f. a spider assembly including, i. a locking collar attached to said distal end of said inner tube, ii. a hub, and iii. a plurality of radial springs connecting said locking collar to said hub; g. a rotation-limiting connection between said handle and said actuator, so that rotation between said handle and said actuator is limited; h. a threaded engagement between said adjuster and said actuator, configured so that rotating said adjuster with respect to said handle causes said adjuster to move linearly with respect to said actuator; i. a mechanical link between said actuator and said handle, said mechanical link configured to lock said actuator in a first state in which said actuator is moved away from said distal end of said handle and a second state in which said actuator is moved toward said distal end of said handle; j. wherein said components are sized such that in said first state said spider assembly lies within said cannula and in said second state said spider assembly extends beyond said distal opening of said cannula; and k. a mechanical assist rod connecting said hub to said adjuster, said mechanical assist rod passing through said passage in said actuator, said mechanical assist rod being attached to said adjuster so that rotating said adjuster in a first direction with respect to said handle draws said hub toward said locking collar, thereby expanding said plurality of radial springs, and rotating said adjuster in a second direction with respect to said handle forces said hub away from said locking collar, thereby retracting said plurality of radial springs.