Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1997-07-17
1999-03-09
Milano, Michael J.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
A61F 232
Patent
active
058794077
ABSTRACT:
A ball and socket joint providing longevity especially suitable for use in implants in human bodies. The ball is designed to incorporate specified strength, hardness, and smoothness characteristics. The socket has a cooperating bearing surface which is less hard than that of the ball. This combination of characteristics lead to maximal mutual bearing contact which minimizes local friction and abrasion. Both components are biologically inert. One component is hydrophilic. The ball is preferably formed from a ceramic, such as a metal or silicon oxide or carbide. The socket preferably has a noble metal alloy liner partially surrounding the ball. The socket further includes an insulator isolating the liner from the socket structural member, should the latter be formed from a different metal. The liner can be formed in complementary segments to avoid fracture or splitting. The liner is either mechanically entrapped by the socket structural member or is adhered thereto. The novel ball and socket joint minimizes wear and chemical, electrochemical, and mechanical deterioration in the environment of the human body.
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Milano Michael J.
Siemens Terrance L.
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