Bone anchoring element

Abstract

A bone anchoring element includes a shaft for anchoring in a bone, the shaft having a tubular body. The shaft comprises a plurality of barb elements, wherein each barb element is formed as continuous one-piece part with the tubular body. Each each barb element is moveable between a first position adjacent to the tubular body and a second position further from the tubular body than the first position. The barb elements are arranged along at least one helical line around an axis of the shaft.

1 . A bone anchoring element comprising:
 a shaft for anchoring in a bone, the shaft having a tubular body, wherein said shaft comprises a plurality of barb elements, wherein each barb element is formed as a continuous one-piece part with the tubular body;   wherein each barb element is moveable between a first position adjacent to a surface of the tubular body and a second position farther from the surface of the tubular body than the first position; and   wherein the barb elements are arranged along at least one helical line around an axis of the shaft.   
     
     
         2 . The bone anchoring element of  claim 1 , wherein said barb elements are cut out of the wall of said tubular body. 
     
     
         3 . The bone anchoring element of  claim 1 , wherein the barb elements have a free cutting edge, respectively, which includes an angle with a circular circumference line of the shaft. 
     
     
         4 . The bone anchoring element of  claim 1 , wherein said tubular body forms a hollow part of said shaft. 
     
     
         5 . The bone anchoring element of  claim 1 , wherein said tubular body is placed onto an essentially cylindrical shaft part. 
     
     
         6 . (canceled) 
     
     
         7 . (canceled) 
     
     
         8 . The bone anchoring element of  claim 1 , further comprising a tip which is fixedly connectable to said tubular body. 
     
     
         9 . (canceled) 
     
     
         10 . The bone anchoring element of  claim 8 , further comprising a head, which is connectable to said tubular body. 
     
     
         11 . The bone anchoring element of  claim 1 , further comprising a head, which is connectable to said tubular body. 
     
     
         12 . The bone anchoring element of  claim 1 , wherein said tubular body is formed of a shape memory alloy. 
     
     
         13 . The bone anchoring element of  claim 12 , wherein said tubular body is formed from nitinol. 
     
     
         14 . The bone anchoring element of  claim 1 , wherein said tubular body includes two longitudinally opposing open ends. 
     
     
         15 . (canceled) 
     
     
         16 . A method of using a bone anchoring element, the method comprising:
 inserting a shaft into a core hole prepared in a bone, a diameter of the core substantially corresponding to the diameter of the shaft, wherein the shaft comprises a tubular body having a plurality of barb elements formed as a continuous one-piece part with the tubular body, the barb elements being arranged along at least one helical line around an axis of the shaft; and   turning the shaft after insertion of the shaft into the core hole in any one of a first direction and a second direction being opposite the first direction, the turning of the shaft in the first direction causing the shaft to be moved in an insertion direction deeper in the core hole, and the turning of the shaft in the second direction causing the shaft to be moved in the core hole opposite to the insertion direction;   wherein the barb elements are moveable between a first position adjacent to a surface of the tubular body and a second position farther from the surface of the tubular body than the first position to prevent the shaft from being pulled out of the core hole.   
     
     
         17 . The method of  claim 16 , wherein the barb elements are constructed from a shape memory alloy such that the barb elements are moved into the second position upon being exposed to heat from the bone. 
     
     
         18 . A bone anchoring element comprising:
 a shaft for anchoring in a bone, the shaft having a tubular body, wherein said shaft comprises a plurality of barb elements, wherein each barb element is formed as continuous one-piece part with the tubular body;   a head connectable to the shaft;   a tip connectable to the shaft;   wherein each barb element is moveable between a first position adjacent to a surface of the tubular body and a second position farther from the surface of the tubular body than the first position; and   wherein the barb elements are arranged along at least one helical line around an axis of the shaft.   
     
     
         19 . The bone anchoring element of  claim 18 , wherein the barb elements are cut out of a wall of the tubular body. 
     
     
         20 . The bone anchoring element of  claim 18 , wherein each barb element includes a free cutting edge, wherein the cutting edge forms an angle with a circular circumference line of the shaft. 
     
     
         21 . The bone anchoring element of  claim 18 , wherein said tubular body is placed onto an essentially cylindrical shaft part. 
     
     
         22 . (canceled) 
     
     
         23 . The bone anchoring element of  claim 18 , wherein said tubular body is formed of a shape memory alloy. 
     
     
         24 . The bone anchoring element of  claim 23 , wherein said tubular body is formed from nitinol. 
     
     
         25 . The bone anchoring element of  claim 18 , wherein said tubular body includes two longitudinally opposing open ends.