System and method for securing tissue to bone
Disclosed herein are 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 the use of bone anchors to secure tissue to bone.
1. A tissue capture anchor for attaching tissue to bone, the anchor comprising:
an expandable anchor body; and
a spreader configured for displacement along an axis of the anchor body in a first proximal direction toward the anchor body between a first position and a second position, the spreader comprising:
a proximal surface facing the first proximal direction and a distal most surface being substantially flat and transverse to the axis of the anchor body and facing a second direction along the axis away from the first proximal direction;
a plurality of spikes each of which:
separately extends from the distal most surface of the spreader to a distal most spike surface that is substantially flat and transverse to the axis of the anchor body and facing the second direction along the axis away from the first proximal direction;
includes a first side extending along a first plane, a second side opposite the first side extending along a second plane and parallel to the first plane, and a third side opposite a fourth side; and
is configured to engage with tissue;
an angled portion configured to expand the anchor body as the spreader is advanced from the first position to the second position in the first proximal direction.
2. The anchor of claim 1 , wherein the anchor body comprises an expandable tine.
3. The anchor of claim 1 , wherein the anchor body comprises a plurality of expandable tines.
4. The anchor of claim 3 , wherein the spreader expands the anchor body by deploying the plurality of expandable tines.
5. The anchor of claim 3 , wherein an outside surface of each tine comprises at least two teeth.
6. The anchor of claim 3 , wherein an outside surface of the tines comprise ridges or teeth which are configured to secure the anchor body within bone.
7. The anchor of claim 1 , wherein the anchor body defines a central hole adapted to receive a proximal end of the spreader.
8. The anchor of claim 1 , wherein an outside surface of the spreader comprises a lateral protrusion and a central hole of the anchor body comprises indentations adapted to engage the lateral protrusion for inhibiting movement of a proximal end of the spreader relative to the central hole.
9. The anchor of claim 1 , wherein an inside surface of a central hole in the anchor body comprises a groove and a proximal end of the spreader comprises a ridge adapted to fixedly snap within the anchor body's groove.
10. The anchor of claim 1 , wherein the anchor is comprised of polyether-ether-ketone (PEEK).
11. The anchor of claim 1 , wherein the plurality of spikes comprise 12 spikes.
12. The anchor of claim 1 , wherein the plurality of spikes comprise 6 spikes.
13. The anchor of claim 1 , wherein the plurality of spikes comprise 4 spikes.