Implantation of repair chords in the heart

A method, comprising:

• providing a rotatable structure coupled to a mechanical locking element having a surface coupled to a lower surface of the rotatable structure;
• implanting the rotatable structure in cardiac tissue;
• advancing an elongate tool through a channel provided by the rotatable structure;
• unlocking the rotatable structure from the mechanical locking element by pushing a depressible portion of the surface of the locking element;
• responsively to the pushing of the depressible portion, dislodging a protrusion protruding out of a plane of the surface of the mechanical element from within a recess defined by the rotatable structure;
• and
• in response to the dislodging, rotating the rotatable structure.

Apparatus for adjusting at least one dimension of an implant, comprising:

• a rotatable structure having a first end shaped to define a first opening, and a second end shaped to define a second opening and having a lower surface thereof, the rotatable structure being shaped to define:
• a channel extending from the first Opening to the second opening, the channel being configured for passage therethrough of an elongate tool, and
• a first coupling at the lower surface of the second end thereof;
• and
• a mechanical element having a surface coupled to the lower surface of the rotatable structure, the mechanical element being shaped to provide:
• a second coupling configured to engage the first coupling during a resting state of the mechanical clement, in a manner that restricts rotation of the rotatable structure, and
• a depressible portion coupled to the protrusion, the depressible portion being disposed in communication with the second opening of the lower surface, and configured to disengage the first and second couplings in response to a force applied thereto by the elongate tool.

A method, comprising:

• providing a rotatable structure, and a mechanical locking element that is coupled to a lower surface of the rotatable structure:
• implanting the rotatable structure in cardiac tissue;
• advancing an elongate tool through a channel provided by the rotatable structure;
• unlocking the rotatable structure from the mechanical locking element by pushing a depressible portion of the locking element;
• responsively to the pushing of the depressible portion, dislodging a first coupling provided by the rotatable structure from a second coupling provided by the mechanical element;
• and
• in response to the dislodging, rotating the rotatable structure.