Method and apparatus for attaching connective tissues to bone using a knotless suture anchoring device
An innovative bone anchor and methods for securing soft tissue, such as tendons, to bone are described herein Such devices and methods permit a suture attachment that lies beneath the cortical bone surface and does not require tying of knots in the suture.
1. A knotless suture anchoring system, comprising:
a suture having a tissue engaging portion, an anchoring portion and a mid portion therebetween;
an anchor body having at least one rigid anchoring structure allowing for securing the anchor body within the body cavity, the anchor body having a proximal end, a distal end, and a lumen extending therebetween;
a locking plug having a distal stop and a shaft portion at least partially located within the anchor body lumen, the distal stop being sized to prevent entry into the anchor body lumen, where the shaft portion is under sized relative to the anchor body lumen such that insertion of the shaft into the lumen does not deform the anchor body;
a suture carrying portion associated with one of the distal stop or shaft portion allowing the suture to pass from a first side of the locking plug to an opposite side of the locking plug;
where the tissue engaging portion extends from the distal end to the proximal end of the body exterior and is wedged between the body cavity and exterior of body anchor, the anchoring portion extends within the anchor body lumen, and where the mid portion extends in the suture carrying portion.
2. The system of claim 1 , where the anchor body is generally tubular and has a plurality of ridges circumferentially located about the anchor body.
3. The system of claim 2 , where the ridges are tapered to permit insertion of the anchor body into the body cavity when advanced in a first direction and resist removal of the anchor body when withdrawn in an opposite direction.
4. The system of claim 1 , where the locking plug shaft is smooth.
5. The system of claim 1 , wherein the anchoring portion is secured within the anchor body.
6. The system of claim 1 , wherein the locking plug is slidably movable within the anchor body lumen.
7. The system of claim 1 , wherein the locking plug comprises an internal threaded portion operable for removable connection with a rod.
8. The system of claim 7 , wherein the rod is adapted for coupling to an actuation assembly having a handle portion and where the actuation assembly further comprises a spool member operable to engage the suture, such that actuation of the spool member allows for tensioning of the suture.
9. The system of claim 7 , further including a section of tensile weakness along the rod permitting the rod to be detached from the shaft upon application of a predetermined tensile force on the rod in the proximal direction after the distal stop contacts the anchor body.