A kind of detachable actuator arm is as part or combines skeletonization wrong choice device, and actuator arm is the relieving mechanism that can be proximally arranged from the device of the wrong choice of traction mechanism by manipulation. A kind of detachable actuator arm provides as part ostosis wrong choice device or combines skeletonization dilator, the actuator arm constructs in this way, its proximal end is designed to and driving instrument, so that the arm can be rotated, when needed, be with the distal end of arm the arm constructed in this way be bonded in a manner of lockable with the main body of the wrong choice of effective traction mechanism.
