Closed band for percutaneous annuloplasty

A method comprising:

• during a percutaneous transcatheter procedure, placing an annuloplasty device around an annulus of a mitral valve of a subject, the annuloplasty device comprising a flexible sleeve;
• fastening the flexible sleeve to the annulus by coupling a plurality of tissue anchors to a posterior portion of the annulus, without coupling any tissue anchors to any anterior portion of the annulus between left and right fibrous trigones of the annulus, wherein coupling the plurality of tissue anchors to the posterior portion of the annulus comprises separately introducing each of the plurality of tissue anchors into the flexible sleeve during the coupling of the plurality of tissue anchors to the posterior portion of the annulus;
• after (a) placing the annuloplasty device around the annulus and (b) fastening the flexible sleeve to the annulus, actuating a contracting assembly comprising a longitudinal contracting member and a locking mechanism to longitudinally contract a longitudinal portion of the flexible sleeve;
• and
• after longitudinally contracting the longitudinal portion of the flexible sleeve, locking the longitudinal contracting member with respect to the contracting assembly using the locking mechanism.