Adjustable annuloplasty device with alternating peaks and troughs

Apparatus for use at a valve of a heart of a subject, the apparatus comprising:

• a ring, comprising (i) a plurality of struts arranged in a pattern of alternating peaks and troughs, and (ii) a plurality of hinges,
• at least one hinge of the plurality of hinges being disposed at each trough,
• each strut having a first end-portion and a second end-portion,
• each peak defined by convergence of adjacent first end-portions disposed at an angle with respect to each other, and
• each trough defined by convergence of adjacent second end-portions;
• and
• a plurality of anchors, each anchor:
• having a longitudinal axis,
• configured to be driven along the longitudinal axis into tissue of the heart,
• coupled to the ring at a respective trough via the at least one hinge in a manner that facilitates:
• movement of the anchor along the longitudinal axis with respect to the trough, and
• deflection of the longitudinal axis with respect to the trough.