System and method for securing tissue to bone
Methods and devices for securing soft tissue to a rigid material such as bone. A tissue capture anchor is described that comprises an anchor body and a spreader such that tissue may be captured or compressed between outside surfaces on the anchor and spreader and inside surfaces of a bone hole to secure the tissue within the hole. A bone anchor is described that comprises an anchor body with expandable tines and a spreader that expands the tines into bone. The spreader captures tissue via a suture loop at the distal end of the bone anchor. Also described is an inserter that can be used to insert the anchor into bone and move the spreader within the anchor to expand the anchor and capture the tissue between the anchor and the bone. Methods are described that allow use of single bone anchor to secure tissue to bone or also to use more than one bone anchor to provide multiple lengths of suture material to compress a large area of soft tissue against bone.
1. A tissue capture anchor for attaching tissue to bone, the anchor comprising: an anchor body comprising:
a proximal end and at least two expandable tines distally extending from the proximal end; and
a spreader configured to engage with the anchor body, the spreader comprising:
a distal end comprising a suture loop;
a central hole adapted to receive a proximal end of anchor body; an angled portion, interior to the spreader, configured to force the expandable tines outward as the spreader is moved relative to the anchor body, wherein the suture loop is configured to receive tissue, and wherein an inside surface of the central hole in the anchor body comprises a groove and an outside surface of the spreader comprises a ridge adapted to fixedly snap within the anchor body's groove.
2. A tissue capture anchor and inserter combination comprising:
an anchor according to claim 1 ;
a handle;
an outer tube coupled to the handle;
an inner tube or rod positioned within the outer tube and coupled to the spreader;
an actuator shaft positioned within the handle and coupled to the inner tube or rod; and
a deployment knob coupled to the handle and the actuator shaft and configured to move the actuator shaft relative to the handle and the inner tube relative to the outer tube;
wherein an inserter tool is configured to draw the spreader into the anchor body to expand the tines and secure tissue to the bone.
3. The anchor of claim 1 , wherein the distal end is curved.
4. The anchor of claim 3 , wherein the curved end comprises two holes configured to receive suture.
5. The anchor of claim 1 , wherein the anchor is comprised of polyether-ether-ketone (PEEK).
6. The anchor of claim 1 , wherein an outside surface of each tine comprises at least two teeth.
7. The anchor of claim 1 , wherein an outside surface of the tines comprise ridges or teeth which are configured to secure the anchor body within bone.
8. The anchor of claim 1 , wherein the spreader comprises apertures in its sides through which the expandable tines extend.