Devices and methods for annular repair of intervertebral discs
Devices and methods for treating a damaged intervertebral disc to reduce or eliminate associated back pain. The present invention provides disc reinforcement therapy (DRT) which involves implanting one or more reinforcement members in and preferably around the annulus of the disc. The reinforcement members may be used to stabilize the annulus and/or compresses a portion of the annulus so as to reduce a bulge and/or close a fissure. The implantable devices and associated delivery tools may incorporate heating capabilities to thermally treat the annular tissue. Alternatively or in combination, other devices may be specifically employed for such thermal treatment.
1. An apparatus for treating intervertebral disc disease, comprising:
an implant configured to be at least partially implanted within annular tissue of a diseased intervertebral disc, the implant including:
a reinforcement member sized and shaped to be delivered through a needle and to extend generally circumferentially within the annular tissue when implanted therein; and
an anchor portion coupled to the reinforcement member and adapted to fix the reinforcement member into the annular tissue,
the implant having an implantation position and a fixation position, the anchor portion being resistive to expulsion from the annular tissue when in the fixation position.
2. The apparatus of claim 1 , wherein the anchor portion comprises at least one anchor mechanism adapted to resist expulsion.
3. The apparatus according to claim 1 , wherein the anchor portion is formed integral to the implant.
4. The apparatus according to claim 1 , wherein the anchor portion comprises one or more anchor mechanisms that project into annular tissue when the implant is in the fixation position.
5. The apparatus of claim 1 wherein the anchor portion includes threads extending about the reinforcement member.
6. The apparatus of claim 5 wherein the threads have a variable pitch along a length of the reinforcement member.
7. The apparatus of claim 1 wherein the anchor portion includes an expandable anchor.
8. The apparatus of claim 1 wherein the reinforcement member is an expandable reinforcement member.
9. A method for treating intervertebral disc disease in a patient, the method comprising:
(1) inserting a delivery device comprising at least one tube having a lumen into an intervertebral disc of a patient;
(2) delivering a biocompatible implant through said lumen of said delivery device, said implant comprising a reinforcement member and an anchor portion coupled to the reinforcement member, the implant adapted to be implanted and fixed into annular tissue, said implant having an implantation position and a fixation position, and said anchor portion being resistive to expulsion from the annular tissue when the implant is in the fixation position;
(3) positioning the implant generally circumferentially within the annular tissue; and
(4) engaging said annular tissue with the anchor portion of said implant, thereby fixing said implant into the annular tissue.
10. The method for treating intervertebral disc disease of claim 9 , wherein the fixation position of said anchor portion of said implant is an at least partially expanded position.
11. The method of claim 9 wherein the anchor portion includes threads extending about the reinforcement member.
12. The method of claim 11 wherein the threads have a variable pitch along a length of the reinforcement member.
13. The method of claim 9 wherein the anchor portion includes an expandable anchor.
14. The method of claim 9 wherein the reinforcement member is an expandable reinforcement member.