Soft suture anchor assembly with barbed suture and attached tissue fixation disk
A suture anchor assembly and a method of tissue repair using the assembly. The assembly includes a soft suture anchor formed of a flexible tubular sheath with opposing open ends which receives a suture strand from a suture construct. The suture strand has a tensioning free end and an opposite tissue-fixation end. A tissue-fixation device, such as a disk, is coupled to the tissue-fixation end of the suture strand. The suture strand has uni-directional barbs which allow one-way tensioning, to provide secure fixation of soft tissue to bone as the strand is pulled through the sheath of the soft anchor.
1. A method of tissue repair, comprising the steps of:
loading a soft anchor with a suture construct including a suture strand passing through a tubular sheath of the soft anchor, the suture strand having a tensioning free end and an opposite tissue-fixation end, a tissue-fixation device coupled to the tissue-fixation end of the suture strand, and a locking structure disposed on the suture strand;
passing the pre-loaded soft anchor through tissue;
installing the pre-loaded soft anchor in a hole formed in bone; and
pulling the tensioning free end of the suture strand to draw the tissue-fixation device against the tissue to approximate the tissue to bone and draw at least a portion of the locking structure into the tubular sheath of the soft anchor, thereby locking the suture construct in place.
2. A method according to claim 1 , wherein, when the soft anchor is passed through the tissue, the tensioning free end and the tissue-fixation end of the suture strand remain and are not passed through the tissue.
3. A method according to claim 1 , wherein pulling the tensioning free end of the suture strand pulls the locking structure through the tissue.
4. A method according to claim 3 , wherein the locking structure includes barbs that angle outwardly in a direction toward the tissue-fixation device to facilitate passage of the locking structure through the tissue and facilitate a one-way locking engagement with the tubular sheath of the soft anchor.
5. A method according to claim 1 , wherein the step of passing the pre-loaded soft anchor through tissue includes passing the pre-loaded soft anchor through a guide that was previously passed through the tissue.
6. A method according to claim 5 , further comprising the step of removing the guide once the soft anchor is installed in the hole formed in bone.
7. A method according to claim 6 , wherein the guide includes an elongated slot to facilitate removal of the guide without interfering with the suture construct.
8. A method according to claim 1 , wherein the soft anchor is installed into the hole formed in bone by capturing the tubular sheath of the soft anchor with an inserter and malleting the inserter to advance the soft anchor into the hole.
9. A method according to claim 1 , further comprising the step of overmolding the locking structure on the tissue-fixation end of the suture strand.
10. A method according to claim 1 , wherein the suture strand is passed through open ends of the tubular sheath.
11. A method according to claim 1 , wherein the step of pulling the tensioning free end includes pulling a loop on the tensioning free end of the suture strand.