Patent ID: 7935134

Claim:
A bone stabilization device for a patient in which first and second bone anchors are attached to bone at first and second locations respectively, the bone anchors coupled by at least one dynamic rod, wherein the dynamic rod comprises: a proximal segment and a distal segment, the proximal segment coupled to a first bone anchor and the distal segment coupled to a second bone anchor; wherein the proximal segment is joined to the distal segment at a dynamic element that includes: a distal threaded section having helical grooves, the distal threaded section disposed at a distal end of the proximal segment; a proximal threaded section having helical grooves, the proximal threaded section disposed at a proximal end of the distal segment; a spring configured to joinedly couple the distal threaded section and the proximal threaded section; a housing substantially surrounding the dynamic element; and an elastomeric material positioned in the housing; wherein coils of the spring are configured to be received in and correspond to the helical grooves of the distal threaded section and the helical grooves of the proximal threaded section.