Anchoring element for fixing a rod of a device for setting a human or animal spinal column to a vertebra

Abstract

The invention relates to an anchoring element for fixing a rod of a device for setting a human or animal spinal column to a vertebra, comprising a screwed element ( 16 ) and a retaining element, whereby the screwed element ( 16 ) has a bearing element in the form of a spherical segment and a conically-tapering threaded shaft ( 18 ) and the retaining element has a mounting ( 12 ), for housing the rod and a bearing shell ( 14 ), for housing the bearing element of the screwed element ( 16 ). According to the invention, an anchoring element with low material requirements and simple to produce can be achieved, whereby the bearing shell ( 14 ) is embodied to correspond to the bearing element such that the bearing element may be directly mounted in the bearing shell ( 14 ).

1 . An anchoring element for fastening a rod of a device for adjusting a human or animal spine to a vertebral bone, s said anchoring element having a screw element ( 16 ) and a retaining element ( 10 ), said screw element ( 16 ) comprising a bearing element ( 20 ) in the shape of a spherical segment and a threaded shank ( 18 ) provided with a conical taper and the retaining element ( 10 ) comprising a mounting ( 12 ) for receiving the rod and a bearing shell ( 14 ) for receiving the bearing element ( 20 ) of the screw element ( 16 ), characterized in that the bearing shell ( 14 ) is configured to correspond to the bearing element ( 20 ) so that the bearing element ( 20 ) is adapted to be directly carried in the bearing shell ( 14 ).  
   
   
       2 . The anchoring element according to  claim 1 , 
 characterized in that the bearing element ( 20 ) and/or the bearing shell ( 14 ) comprise surface dimples or roughenings.    
   
   
       3 . The anchoring element according to  claim 1 , 
 characterized in that the bearing element ( 20 ) and/or the bearing shell ( 14 ) comprises a number of flutes ( 32 ) or grooves on its surface.    
   
   
       4 . The anchoring element according to  claim 3 , 
 characterized in that the flutes ( 32 ) or grooves are oriented obliquely.    
   
   
       5 . The anchoring element according to  claim 4 , 
 characterized in that the flutes ( 32 ) or grooves are disposed on confronting sides of the bearing element ( 20 ) or the bearing shell ( 14 ) so as to be oriented in opposite directions.