| abstract |
An orthopedic implant in the form of a hip joint endoprosthesis consists of a head which is placed on an anchoring shaft, which in turn is insertable into a bone and anchored in this. The head has an inner blind hole-like recess, and the anchoring shaft is provided with a pin for insertion into this recess. In the recess of the head is provided with a sleeve provided with an approximately central through-hole, over which the head can be placed on the pin. The head is made of a ceramic based on zirconia, alumina or a mixed ceramic, while the sleeve is made of a high-strength titanium material. The connection between the head and the sleeve is produced by a silicatic first glass solder solidifying in a ceramic firing and by a subsequently applied second glass solder, the excess of which can escape via the through hole into a cavity existing between the sleeve and the pin and, on cooling, this Through hole closes as a plug. Both the recess of the head and the metallic sleeve are formed approximately cylindrical. |