Patent ID: 8016837

Claim:
A bone displacement apparatus comprising: a first bone attachment member; a second bone attachment member having a driving member, the first bone attachment member axially moveable relative to the second bone attachment member; a clutch mechanism connected to the first bone attachment member and operatively associated with the driving member to advance the driving member in a displacement direction; wherein the clutch mechanism includes a plurality of rollers; a housing containing the rollers and having a converging inner wall portion; the clutch mechanism having a first condition wherein upon rotation of the housing in a first direction, the rollers are wedged between the housing and the driving member, and the driving member rotates in the first direction; and a second condition wherein upon rotation of the housing in a second direction different from the first direction, the driving member remains stationary without rotating; a lever connected to the clutch mechanism, the lever including an aperture and an eccentric disc positioned within the aperture, wherein rotation of the eccentric disc in a first direction displaces the lever in a first direction, which provides rotation to the housing of the clutch mechanism in a first direction, and displaces the lever in a second direction, which provides rotation to the housing of the clutch mechanism in a second direction; and an actuator constructed and arranged to provide motion to the eccentric disc which displaces the lever.