Patent ID: 8911494

Claim:
Apparatus for use with tissue of a subject, the apparatus comprising: an anchor driver, which comprises a driver head, which is shaped so as to define one or more mechanical coupling elements, and which comprises a flexible ring; and an anchor, which comprises: a coupling head, which is shaped so as to define: (a) one or more mating elements corresponding to the mechanical coupling elements, and configured to engage the mechanical coupling elements such that rotation of the mechanical coupling elements rotates the mating elements, which in turn rotate the coupling head, and (b) an outer coupling surface, sized and shaped to be inserted into and to be mechanically interlocked with the flexible ring; and a tissue coupling element, which is fixed to the coupling head, wherein the rotation of the mechanical coupling elements causes the tissue coupling element of the anchor to screw itself into the tissue, thereby causing separation of: (a) the outer coupling surface of the coupling head from the flexible ring, and (b) the mating elements of the coupling head from the corresponding mechanical coupling elements, and wherein the outer coupling surface of the coupling head is shaped so as to define a screw thread, such that rotation of the mechanical coupling elements causes the outer coupling surface to unscrew from the flexible ring.