Bone anchoring device

Abstract

A bone anchoring device includes a receiving part for receiving a rod, the receiving part having a first bore coaxial with a longitudinal axis and a second bore. The bone anchoring device also includes an anchoring element having a first end for insertion into the bone and a second end positionable within a second bore, the second end having a spherically shaped surface portion. The bone anchoring device further has a locking device provided to the second bore of the receiving part The locking device protrudes from an inner wall of the second bore and engages with a recessed surface portion of the second end of the anchoring element, such that the anchoring element is pivotable relative to the receiving part around a single axis of rotation. The locking device may comprise pins inserted into through holes formed in the receiving part, which engage with the recessed surface portion of the second end.

1 . A bone anchoring device, comprising:
 a receiving part for receiving a rod, the receiving part having a first bore coaxial with a longitudinal axis and a second bore, the receiving part comprising a through hole;   an anchoring element having a first end for insertion into the bone and a second end positionable within the second bore, the second end comprising a surface having a spherically shaped surface portion and a portion recessed from the spherically shaped surface portion;   at least one pin provided to the second bore of the receiving part by insertion into the through hole, such that the pin protrudes from an inner surface of the second bore and engages with the portion recessed from the spherically shaped surface portion of the second end of the anchoring element, such that the anchoring element is pivotable relative to the receiving part around a single axis of rotation.   
     
     
         2 . The bone anchoring device according to  claim 1 , wherein the through hole extends from a first opening formed in an outer surface of the receiving part towards a second opening formed in the inner surface of the second bore, such that the pin protrudes out of the second opening in the inner surface of the second bore. 
     
     
         3 . The bone anchoring device according to  claim 2 , wherein the through hole is arranged such that upon insertion the pin tangentially engages with the recessed surface portion of the second end of the anchoring element. 
     
     
         4 . The bone anchoring device according to  claim 1  wherein two pins are provided for insertion into respective through holes formed in the receiving part. 
     
     
         5 . The bone anchoring device according to  claim 1 , wherein the pin is integrally formed with the receiving part. 
     
     
         6 . The bone anchoring device according to  claim 1 , wherein the pin is arranged such that the single axis of rotation is perpendicular relative to the longitudinal axis of the receiving part. 
     
     
         7 . (canceled) 
     
     
         8 . The bone anchoring device according to  claim 1 , wherein the recessed surface portion of the second end of the anchoring element is substantially flat. 
     
     
         9 . The bone anchoring device according to  claim 1 , wherein a fixation element cooperates with the receiving part to lock the anchoring element relative to the receiving part. 
     
     
         10 . A method of anchoring a bone anchoring device to a bone, the method comprising:
 anchoring a bone anchoring assembly to the bone, the bone anchoring assembly comprising a receiving part for receiving a rod and an anchoring element, the receiving part having a first bore coaxial with a longitudinal axis and a second bore, the receiving part comprising a through hole; the anchoring element having a first end for insertion into the bone and a second end positionable within the second bore, the second end comprising a surface having a spherically shaped surface portion and a portion recessed from the spherically shaped surface portion; and   inserting at least one pin in the through hole, the pin protruding from an inner surface of the second bore and engaging with the portion recessed from the spherically shaped surface portion of the second end of the anchoring element to provide pivoting of the anchoring element relative to the receiving part around a single axis of rotation.   
     
     
         11 . The method of  claim 10 , further comprising:
 inserting a rod in the receiving part;   adjusting an angular position of the anchoring element relative to receiving part around the single axis of rotation; and   securing the anchoring element relative to the receiving part and securing the rod in the receiving part with at least one fixation element.   
     
     
         12 . (canceled) 
     
     
         13 . The method of  claim 10 , further comprising assembling the bone anchoring assembly by assembling the anchoring element and the receiving part.