Hip joint prosthesis with damping device - is formed with stack of disc springs inserted in hole in ball for neck prosthesis.

摘要

The prosthesis is fitted with a damping device which consists of a stack of disc springs (8). These are fitted in the chamber (5) formed between the end face of the neck (2) and the floor (6) of the blind hole and damp out any shock loads in the axial direction. The dia. of each disc spring is such that when compressed flat the OD is smaller than the dia. of the hole (4) in the ball (1). The neck has a self lubricating cover (10) along its length. USE/ADVANTAGE - The disc springs in the hip joint prosthesis are less susceptible to fatigue failure than the helical coil springs which are usually fitted.