Implant module unit and rotating seal for prosthetic joint

Abstract

An implantable module for use with a prosthetic joint that utilizes a bellows and a rotating seal for encapsulating the articulating members of the implant. This invention is comprised of flexible metallic bellows which serve the same function as the presently used boot, which includes containing a lubricant to decrease the wear to the articulating surfaces and preventing the lubricant or wear debris from escaping into the surrounding tissues. The implant module has the novel feature of maintaining the articulating bearing surfaces in proper alignment by utilizing a spring force from the metallic bellows to augment the function of the tendons, ligaments, and muscles that have been surgically traumatized and to prevent exposure of the articulating surfaces to excessive expansion, compression, or rotational forces. Furthermore, a thrust bearing with rotating seal is located between the flexible bellows and the neck of the implant freeing the bellows from rotational cycles, thus increasing the life of the bellows. The thrust bearing transfers the spring force from the metallic bellows to the permanent implant and prevents axial movement of the rotating seal along the neck. The thrust bearing with rotating seal can also be used to enhance the performance and longevity of non-metallic flexible members. The implant module includes the metallic bellows, the thrust bearing with rotating seal and the enclosed lubricated articulating assembly. If necessary, the implant module may be surgically removed and replaced by a new implant module without disturbing the integrity of other implantable components that are affixed to bone.