Prosthetic valve and delivery tool therefor

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

• a delivery tool, comprising:
• a shaft, having a shaft-axis;
• a capsule, disposed at a distal portion of the tool, and comprising an upstream capsule-portion and a downstream capsule-portion, the capsule being openable by moving the upstream capsule-portion and the downstream capsule-portion apart;
• and
• a balloon, coupled to the shaft, and disposed within the capsule;
• and
• a prosthetic valve, comprising:
• a tubular frame that circumscribes a longitudinal axis to define a lumen along the longitudinal axis, that is compressed around the balloon, and that is disposed within the capsule;
• and
• an outer frame, the outer frame comprising:
• one or more shape-memory flanges, constrained within the downstream capsule-portion;
• and
• a shape-memory upstream support portion, constrained within the upstream capsule-portion,
• wherein:
• the flanges are configured to automatically deflect radially outward from the tubular frame upon exposure from the downstream capsule-portion,
• the upstream support portion is configured to automatically deflect radially outward upon exposure from the upstream capsule-portion,
• the tubular frame is configured to remain compressed around the balloon upon exposure of the tubular frame from the capsule,
• the outer frame is disposed radially outward from the tubular frame and longitudinally overlapping the tubular frame, and
• while the tubular frame is exposed from the capsule:
• the tubular frame is configured to inhibit the outer frame from radially expanding, prior to inflation of the balloon, and
• inflation of the balloon plastically expands the tubular frame radially.