Abstract: A pressure stabilizing cavum includes multiple PE pipes and a backing plate. The multiple PE pipes are inserted through a longitudinal keel of the ship. Each PE pipe is provided with a first opening. Both two sides of the each PE pipe in the width direction of the first opening are connected to a hull bottom plate of the ship to form a pressure stabilizing cavum. The backing plate is located between the each PE pipe and the hull bottom plate and is sealingly connected to the each PE pipe and the hull bottom plate. The backing plate is provided with a first through hole, and the hull bottom plate is provided with a second through hole communicating with the first through hole, and the pressure stabilizing cavum communicates with the outside of the ship through the first through hole and the second through hole.

Abstract: An anatomic, neck-locking femoral prosthesis for use in total hip replacement is described. The asymmetric device fundamentally comprises a shell with a hollow bell-shape, which is anchored on the outside of retention neck and the trochantic bed of the femur. The prosthesis is mechanically fastened during the operation and further biologically secured by in-growing bone around the neck and trochantic bed area through the side holes on the shell and by growing into its interior porous coating surface of implant thereafter. The loading force on the femoral head would be well distributed on the shell and directly conducted into the cortex bone of the femoral shaft through the shell. The prosthesis would provide a simple and safe replacement method of hip prosthesis for most patients, particularly benefit for younger patient who has a defective head of femur.