Spinal stabilization system with rigid and flexible elements
View Patent ↗A spinal stabilization system generally comprises first and second anchor members configured to be secured to first and second vertebrae within a patient's body, a flexible element secured to the first anchor member, and a rigid element secured to the second anchor member. An end portion of the rigid element is coupled to an end portion of the flexible so that the system is able to provide both rigid and dynamic stabilization. The coupling is maintained even if the flexible element relaxes after a period of time within the patient's body.
1. A spinal stabilization system, comprising:
first and second anchor members configured to be secured to first and second vertebrae, respectively;
a rigid element secured to the first anchor member, the rigid element including an end portion having an axial bore extending into the end portion from an end surface of the rigid element; and
a flexible polymeric element secured to the second anchor member, the flexible polymeric element including an end portion positioned in the axial bore of the rigid element;
wherein the end portion of the rigid element is swaged at two or more spaced apart swage locations to radially compress the flexible polymeric element in the axial bore of the rigid element;
wherein the end portion of the flexible polymeric element is retained in radial compression in the axial bore of the rigid element to prevent separation of the flexible polymeric element from the rigid element.
2. The spinal stabilization system of claim 1 , wherein each of the swage locations includes a circumferential groove extending into an outer surface of the rigid element.
3. The spinal stabilization system of claim 2 , wherein the end portion of the rigid element has a constant outer diameter except for the circumferential grooves at each of the swage locations.
4. The spinal stabilization system of claim 2 , wherein each of the swage locations includes a circumferential protrusion extending into the end portion of the flexible polymeric element.
5. The spinal stabilization system of claim 1 , wherein the rigid element includes three distinct swage locations.
6. The spinal stabilization system of claim 5 , wherein each of the two or more spaced apart swage locations is spaced away from the end surface of the rigid element.
7. The spinal stabilization system of claim 1 , wherein the end portion of the rigid element has a constant outer diameter except at each of the swage locations.
8. A spinal stabilization system, comprising:
first and second anchor members configured to be secured to first and second vertebrae, respectively;
a rigid rod secured to the first anchor member, the rigid rod including an end portion having an axial bore extending into the end portion from an end surface of the rigid rod; and
a flexible polymeric cord secured to the second anchor member, the flexible polymeric cord including an end portion extending into the axial bore of the rigid rod and secured therein;
wherein the end portion of the rigid rod is swaged at two or more spaced apart swage locations to radially compress portions of the flexible polymeric cord positioned in the axial bore of the rigid rod thereby deflecting portions of the flexible polymeric cord radially inward at the swage locations, the end portion of the flexible polymeric cord retained in compression in the axial bore of the rigid rod.
9. The spinal stabilization system of claim 8 , wherein the end portion of the flexible polymeric cord has a constant outer diameter except for circumferential indentations from the swage locations of the rigid rod.
10. The spinal stabilization system of claim 9 , wherein each of the swage locations includes a circumferential protrusion extending into the end portion of the flexible polymeric cord compressing the flexible polymeric cord to define the circumferential indentations in the flexible polymeric cord.