Elastic element for the use in a stabilization device for bones and vertebrae and method for the manufacture of such elastic element

Abstract

A stabilization device for bones or vertebrae comprises a substantially cylindrical elastic element. The elastic element has a first end and a second end opposite to the first end. An elastic section extends between the first end and the second end. The elastic section includes at least first and second helical coils. The first and second helical coils are arranged coaxially so that the first helical coil extends at least in a portion between the second helical coil. The elastic element may form, for example, a portion of a rod, bone anchoring element, or plate.

1 - 13 . (canceled) 
     
     
         14 . A method of manufacturing an elastic element for a stabilization device for bones or vertebrae, comprising the steps of: providing a substantially cylindrical body; and forming first and second helical recess in the cylindrical body from an outside thereof such that the first helical recesses at least in a portion are formed between the second helical recesses. 
     
     
         15 . The method of  claim 14 , wherein the first and second helical recesses are formed by wire electrical discharge machining or milling. 
     
     
         16 . The method of  claim 14 , further comprising the step of forming a bore coaxial with a central axis of the cylindrical member. 
     
     
         17 . The method of  claim 14 , further comprising the step of forming a run-out proximate at least one end of the cylindrical member. 
     
     
         18 . The method of  claim 14 , wherein the first and second helical recesses are formed at approximately the same angle. 
     
     
         19 . The method of  claim 14 , wherein the first and second helical recesses are formed simultaneously. 
     
     
         20 - 25 . (canceled)