Methods and devices for repairing and anchoring damaged tissue
Methods and devices are provided for anchoring suture to tissue, incorporating anchoring devices constructed substantially from suture. The anchoring devices are constructed as longitudinally extended, preformed knot configurations that upon deployment are reconfigured to form anchoring knots having an increased cross-section relative to the preformed knot configuration, for secure lodging in tissue. The anchoring devices are suitable for single and multi-anchor surgical procedures in soft tissue or bone, and multiple anchors can be delivered using a single delivery device.
1. A method for anchoring a suture length to a material internal to a human or another animal, the method comprising the steps of:
positioning into an opening in a portion of the material a preformed knot configuration which is located on a first portion of a suture length, the preformed knot configuration elongate along a first length and having a first cross-sectional area, the first length extending substantially along a longitudinal direction; and
reconfiguring the preformed knot configuration into an anchoring knot by collapsing the preformed knot substantially along the longitudinal direction so as to reduce the first length and increase the cross-sectional area, thereby engaging the anchoring knot against the material.
2. A method according to claim 1 wherein the material is a body tissue of the human or other animal.
3. A method of claim 2 wherein the body tissue is a humerus in a shoulder, and the preformed knot configuration is passed through substantially overlying soft tissue before the positioning into the opening.
4. A method according to claim 1 wherein the material is an implant anchored to a body tissue of the living organism.
5. A method of claim 4 wherein the implant is a cannulated, externally threaded screw.
6. A method according to claim 1 wherein the step of reconfiguring the preformed knot configuration comprises tensioning a second portion of the suture length with respect to the preformed knot configuration, the second portion of the suture length spaced from the first portion of the suture length.
7. A method according to claim 1 wherein the step of reconfiguring the preformed knot configuration comprises placing an abutment against the preformed knot configuration and moving the suture length relative to the abutment to cause the preformed knot configuration to bunch up and increase in cross sectional area.
8. A method according to claim 7 wherein the material comprises meniscal tissue in a knee.
9. A method according to claim 7 wherein the material comprises a first face and an opposite second face, the opening penetrating the first face and through the second face and wherein the step of moving the suture length relative to the abutment comprises pushing the preformed knot configuration through the opening to cause the preformed knot to abut the second face.
10. A method according to claim 1 wherein the step of positioning the preformed knot configuration into the opening comprises penetrating the material with a needle having a longitudinal cannulation, the preformed knot configuration being disposed within the cannulation.
11. A method according to claim 1 wherein the anchoring knot has a cross-sectional area at least ten times the first cross-sectional area.
12. A method according to claim 1 wherein the preformed knot configuration is reconfigured to the anchoring knot within the material.
13. A method according to claim 1 wherein the preformed knot configuration is reconfigured to the anchoring knot after passing through the material.
14. A method according to claim 1 wherein the preformed knot configuration and the suture length are formed from a single line of suture.
15. A method according to claim 1 wherein the portion of the line of suture forming the knot configuration has the same structure and material as the portion of the line of suture forming the suture length.
16. A method according to claim 1 wherein the portion of the line of suture forming the preformed knot configuration differs in at least one of structure and material from the portion of the line of suture forming the suture length.