Prosthetic atrio-ventricular valve

An apparatus for use with a prosthetic valve that is configured to be deployed within a native atrio-ventricular valve of a heart of a subject, the native atrio-ventricular valve including a valve annulus, valve leaflets, and chords, the apparatus comprising:

• a valve frame configured to support the prosthetic valve within the native atrio-ventricular valve, the valve frame comprising:
• a frame body comprising:
• an atrial part configured to be positioned, when the valve frame is deployed, such that at least a portion of the atrial part is disposed on an atrial side of the native atrio-ventricular valve;
• and
• a ventricular part configured to be positioned, when the valve frame is deployed, such that at least a portion of the ventricular part is disposed within a ventricle of the subject;
• and
• at least one arm configured to extend from the ventricular part of the frame body, the at least one arm being configured to deploy among the chords of the native atrio-ventricular valve, and the at least one arm being configured such that when the at least one arm is deployed among the chords and is rotated, the at least one arm pulls the native atrio-ventricular valve radially inward toward the valve frame and twists the native atrio-ventricular valve around the valve frame, by recruiting and deflecting at least a portion of the chords,
• the frame body of the valve frame being configured to trap the native valve leaflets in a partially closed and twisted configuration by radially expanding, to thereby at least partially seal a space between the native atrio-ventricular valve and the prosthetic valve, wherein:
• the ventricular part of the valve frame has radially-compressed and radially-expanded states;
• and
• the at least one arm is configured to become deployed among the chords of native valve, even when the ventricular part of the valve frame is in its radially-compressed state.