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:
at least two expandable tines; and
a spreader extending along a central longitudinal axis and configured to fit within the anchor body, the spreader comprising:
a proximal substantially cylindrical portion comprising a proximal end and a distal end,
a medial portion comprising a proximal end and a distal end, the proximal end of the medial portion connected to the distal end of the proximal portion, the medial portion widens relative to the central longitudinal axis from the proximal end of the medial portion to the distal end of the medial portion, wherein the distal end of the medial portion comprises a first diameter; and
a distal portion comprising a proximal end with a second diameter, wherein the second diameter is smaller than the first diameter, and a distal end, the proximal end of the distal portion directly connected to the distal end of the medial portion, the distal portion tapering toward the central longitudinal axis to a pointed tip configured to spear tissue, wherein a through-hole is formed and positioned through the distal end of the medial portion and through the proximal end of the distal portion.
2. The anchor of claim 1 , wherein the anchor body comprises a central hole adapted to receive the proximal end of the proximal substantially cylindrical portion of the spreader.
3. The anchor of claim 2 , wherein an outside surface of the spreader comprises a lateral protrusion and the central hole of the anchor body comprises indentations adapted to engage the lateral protrusion for inhibiting movement of the proximal end of the proximal substantially cylindrical portion of the spreader relative to the central hole.
4. The anchor of claim 2 , wherein an inside surface of the central hole in the anchor body comprises a groove and the proximal end of the proximal substantially cylindrical portion of the spreader comprises a ridge adapted to fixedly snap within the anchor body's groove.
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. A system comprising:
the tissue capture anchor according to claim 1 ; and
an inserter comprising:
a handle;
an outer tube coupled to the handle;
an inner rod or tube positioned within the outer tube and coupled to the spreader;
an actuator shaft positioned within the handle and coupled to the inner 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 rod or tube relative to the outer tube;
wherein the inserter is configured to draw the spreader into the anchor body to fully deploy the tissue capture anchor and secure tissue to the bone.