Patent ID: 6887277

Claim:
A shoulder joint prosthesis having two bearing bodies ( 1 , 2 ; 11 , 12 ) which slide on one another and which can be respectively connected to an upper arm ( 3 ) by a shaft ( 5 ) and to a shoulder bone ( 4 ) by a platform ( 6 ), wherein connection of the prosthesis to the shaft ( 5 ) is brought about by a non-rotationally symmetrical, conical body ( 7 ) with a self-locking seat, with a periphery ( 8 ) of said conical body being form matched to a mating recess ( 15 ) in the shaft ( 5 ) which is rotationally fixed relative to a longitudinal axis ( 9 ) and keyed by an amount of taper so that connection of the prosthesis to the shaft ( 5 ) is releasable and repeatedly fixable in a predetermined angular position; wherein a bearing shell ( 2 ) is secured to the platform ( 6 ) and a bearing head ( 1 ) to the shaft ( 5 ); wherein the bearing head ( 1 ) has a spherical recess ( 19 ) therein and is connected to the conical body ( 7 ) via a fixable ball joint; and wherein a longitudinally slit ( 21 ) ball ( 23 ) is formed on the conical body ( 7 ), the ball having a conical bore ( 24 ) with a conical pressure member ( 25 ) received in the conical bore ( 24 ); and the conical body ( 7 ) having a threaded bore ( 29 ) adjacent to the conical bore ( 24 ) and a screw ( 27 ) received in the threaded bore ( 29 ) adapted to act on the conical pressure member ( 25 ) in order to spread apart the ball ( 23 ) and to fix the ball in the spherical recess ( 19 ) of the bearing head ( 1 ).