Reduced area thread profile for an open architecture anchor
AssigneeSmith & Nephew, Inc.
InventorMark Edwin Housman
Life of this patent
Estimating the term…
Abstract
The disclosure provides examples of an open architecture anchor for securing soft tissue to bone, for example, to repair a torn rotor cuff. The anchor includes a helical screw thread having a base and two sidewalls that are non-linear. The non-linear sidewalls extend from opposing ends of the base and meet at a peak. The non-linear sidewalls are circumscribed within a triangle defined by the peak and ends of the base. Compared to the standard triangle profile, the helical screw thread profile has a smaller cross-sectional surface area and, consequently, removes less bone. The helical screw thread having the reduced cross-sectional area preserves bone stock and enhances the holding strength of the anchor in bone.
Claims7
An anchor comprising:
- at least one open helical coil screw thread defining an internal volume communicating with a region exterior to the at least one open helical coil screw thread through a spacing between turns of the at least one open helical coil screw thread, the at least one open helical coil screw thread comprising:
- base adjacent the internal volume and having a first end and a second end, and;
- two non-linear side walls extending from the base to form a peak, wherein the two non-linear side walls are each circumscribed within a triangle defined by the first end, the second end, and the peak;
- and
- at least one rib disposed within the internal volume, connected to at least two turns of the at least one open helical screw thread coil.
A delivery device and anchor combination, the combination comprising:
- a delivery device comprising a handle and shaft connected to the handle, the shaft including a distal end having at least one groove extending towards a proximal end of the shaft;
- and
- an anchor comprising at least one open helical coil screw thread defining an internal volume communicating with a region exterior to the at least one open helical coil screw thread through a spacing between turns of the at least one open helical coil screw thread, the at least one open helical coil screw thread comprising:
- base adjacent the internal volume and having a first end and a second end, and two non-linear side walls extending from the base to form a peak, wherein the two non-linear side walls are each circumscribed within a triangle defined by the first end, the second end, and the peak, and at least one rib disposed within the internal volume, connected to at least two turns of the at least one open helical screw thread coil, the anchor located on the distal end of the delivery device such that the at least one groove engages the at least one rib of the anchor.
Dependencies are inferred from the claim text.