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:
an anchor member configured to be secured to a vertebra within a patient's body, the anchor member including:
a pedicle screw body;
a housing having internal threads; and
a set screw configured to rotatably engage the internal threads of the housing;
a rigid element securable to the anchor member, the rigid element having an axial bore extending into the rigid element and an opening on an outer surface of the rigid element extending into the axial bore;
a flexible element receivable within the axial bore, wherein the flexible element is securable within the axial bore; and
a fastener receivable within the opening and configured to retain the flexible element in the axial bore;
wherein the set screw engages the internal threads of the housing and rotation of the set screw advances the fastener in the opening of the rigid element into engagement with the flexible element.
2. The spinal stabilization system of claim 1 , wherein the fastener is a separate component from the set screw.
3. The spinal stabilization system of claim 1 , wherein the fastener is integrally formed with the set screw as a single component.
4. The spinal stabilization system of claim 1 , wherein the housing includes first and second tabs separable from the housing.
5. The spinal stabilization system of claim 4 , wherein the first and second tabs are frangibly connected to the housing.
6. The spinal stabilization system of claim 1 , wherein the rigid element includes a protrusion extending into the axial bore.
7. The spinal stabilization system of claim 6 , wherein the protrusion extends into the axial bore opposite the opening.
8. The spinal stabilization system of claim 1 , wherein the rigid element is receivable within the housing of the anchor member in a direction transverse to the axial bore.
9. A spinal stabilization device comprising:
a rigid member comprising:
an elongate rigid element extending in a longitudinal direction;
an end portion connected to the elongate rigid element, the end portion being shaped to be received within a housing of a pedicle anchor member;
an axial bore extending into the end portion in a longitudinal direction; and
an opening extending into the end portion to intersect the axial bore;
a flexible member configured to be positioned within the axial bore to extend across the opening; and
a fastener configured to radially slide into the opening and engage the flexible member.
10. The spinal stabilization device of claim 9 , wherein the opening extends transverse to the axial bore.
11. The spinal stabilization device of claim 9 , wherein the end portion includes flange members configured to engage the housing of the pedicle anchor member and the bore is located longitudinally between the flange members.
12. The spinal stabilization device of claim 11 , wherein a top surface of the end portion is flat across an entirety of the end portion including the flange members.
13. The spinal stabilization device of claim 12 , wherein the flange members extend below and to the side of the end portion and do not extend above the top surface.
14. The spinal stabilization device of claim 12 , wherein the fastener is configured to extend above the top surface when fully engaged with the flexible member.
15. The spinal stabilization device of claim 9 , wherein the end portion includes a protrusion extending within the axial bore opposite the opening.
16. The spinal stabilization device of claim 9 , further comprising
a housing into which the rigid member is configured to be positioned; and
a set screw configured to engage thread of the housing to advance the fastener into the opening of the rigid member and into engagement with the flexible member.
17. The spinal stabilization device of claim 9 , further comprising a needle connected to the end portion to extend into the axial bore to engage the flexible member.