Apparatus and method for repairing tissue
Assemblies and methods suitable for knotless arthroscopic repair of tissue defects include two fixation members coupled by two limbs of suture comprising a continuous loop. A unidirectional restriction element that can be a preformed locking, sliding suture knot proximate to one of the fixation members, provides tensioning of the repair.
1. An apparatus comprising:
first and second fixation members, the first fixation member having a first surface, an opposing second surface, first, second and third through openings defined between the first surface and the second surface;
a flexible element coupling the first and the second fixation members, the flexible element having a first end, a second end and a length therebetween, the length extending from the first end, in order, along a first end section of suture, through the first opening in the first fixation member from the respective first surface to the respective second surface, to and slideably connecting to the second fixation member, through the second opening in the first fixation member from the respective second surface to the respective first surface, and along a second end section of suture;
a sliding, locking knot formed between the first end section and the second end section, the first end section positioned slidably through the knot, the first end section extending from the knot and through the third opening from the first surface to the second surface and wherein tension applied to the first end section with respect to the first fixation member is effective to decrease a length of the flexible element between the first and the second fixation member along the flexible member coupling the first and the second fixation member.
2. The apparatus according to claim 1 wherein the first, second and third openings through the first fixation member are arranged in substantially a straight line along the respective first and second surface.
3. The apparatus according to claim 1 wherein the first fixation member comprises rounded surfaces between the first, second and third through openings, for sliding the flexible element therealong.
4. The apparatus according to claim 1 further comprising a delivery device having an elongated delivery member within which at least a portion of each of the first and the second fixation members, coupled by the flexible element, is longitudinally and slidably received.
5. The apparatus according to claim 1 wherein the flexible element comprises a suture.
6. The apparatus according to claim 1 wherein the flexible element comprises polyethylene.
7. The apparatus according to claim 1 wherein the flexible element comprises polyethylene and a bioabsorbable polymer.
8. The apparatus according to claim 7 wherein the bioabsorbable polymer comprises polydioxanone.
9. The apparatus according to claim 1 wherein the sliding, locking knot is a bunt line knot.