Prosthesis for bridging a vertebral body

Abstract

Prosthesis for the partial replacement of a vertebral body, with an upper contact plate ( 5 ) for connection to an upper vertebral body ( 1 ), a lower contact plate ( 6 ) for connection to a lower vertebral body ( 2 ), and a bridging part ( 7 ) which connects the upper and lower contact plates ( 5, 6 ) to one another and bridges at least one vertebral body ( 3 ) which is located between the upper and lower vertebral bodies ( 1, 2 ) and is to be partially replaced. The bridging part ( 7 ) is accommodated in a recess in the vertebral body ( 3 ). To be secured in said recess, it has lateral anchoring projections ( 9 ) which penetrate into the bone substance located on both sides of the bridging part ( 7 ). Its cross section narrows toward the rear preferably in a trapezoid shape.

1 . Prosthesis for partial replacement of a vertebral body, with an upper contact plate ( 5 ) for connection to an upper vertebral body ( 1 ), a lower contact plate ( 6 ) for connection to a lower vertebral body ( 2 ), and a bridging part ( 7 ) which connects the upper and lower contact plates ( 5 ,  6 ) to one another, with inclusion of at least one hinge ( 8 ), and is designed for bridging at least one vertebral body ( 3 ) which is located between the upper and lower vertebral bodies ( 1 ,  2 ) and is to be partially replaced, said bridging part ( 7 ) being equipped with means for securing it on the vertebral body ( 3 ), characterized in that the means for securing it on the vertebral body ( 3 ) are formed by rigid anchoring projections ( 9 ,  11 ,  15 ,  32 ) which protrude laterally from the bridging part ( 7 ).  
     
     
         2 . Spinal column prosthesis according to  claim 1 , characterized in that the cross-sectional shape of the bridging part ( 7 ) is rectangular or narrows in the dorsal direction.  
     
     
         3 . Spinal column prosthesis according to  claim 1 , characterized in that the anchoring projections are in the form of a surface roughness.  
     
     
         4 . Spinal column prosthesis according to  claim 1 , characterized in that the bridging part ( 7 ) has openings ( 12 ) or pores for receiving bone tissue.  
     
     
         5 . Spinal column prosthesis according to  claim 4 , characterized in that it is provided with a filling of bone material or bone replacement material.