Artificial articulation
AssigneeNgk Spark Plug Co., Ltd.
InventorsIsamu Fukuura, Shigeo Niwa
Life of this patent
Estimating the term…
Abstract
An artificial articulation includes a socket which has a spherical inner surface, a bone head ball member which is pivotably, slidably received in the spherical inner surface of the socket, and a stem which is connected to the ball head bone member. The socket is made of polycrystal alumina porcelain, the bone head ball member is made of dense silicon nitride porcelain, and the stem is made of either silicon nitride porcelain or partially stabilized zirconia porcelain. An outer surface of the stem and outer surface of the socket are coated with first and second cover layer.
Claims17
A biocompatible artificial articulation prosthesis including an acetabular socket consisting essentially of polycrystal alumina porcelain wherein said socket having formed therein a special inner surface to be pivotally coupled to with a femoral ball member, said femoral member consisting essentially of dense silicon nutride porcelain;
- a stem adapted to be inserted into a prepared medullary cavity and being connected to, at one end thereof, said femoral ball member, said stem consisting of partially stabilized zirconia porcelain;
- said prosthesis further including a first layer disposed over an outer surface of said stem and an outer surface of said socket and a second layer disposed over said first layer wherein said first layer and second layer consist essentially of oxidized alkaline metal-phosphoric and anhydride frit and calcium phosphate, respectively.
Dependencies are inferred from the claim text.