Diametric expansion features for prosthetic valves

A prosthetic valve, comprising:

• a smaller, first prosthetic valve having a first inner diameter and including a first support structure and a first valve structure in an active state such that the first valve structure is configured to allow fluid flow through the prosthetic valve in a first direction and inhibit fluid flow through the prosthetic valve in an opposite, second direction;
• and
• a larger, second prosthetic valve having a second inner diameter that is larger than the first inner diameter of the smaller, first prosthetic valve and including a second support structure and a second valve structure in an inactive state such that the second valve structure is inoperable to inhibit fluid flow through the prosthetic valve,
• wherein the smaller, first prosthetic valve is releasably secured within the larger, second prosthetic valve such that the smaller, first prosthetic valve is configured to be released and removed from the larger, second prosthetic valve to transition the second valve structure to an active state in which the second valve structure is configured to allow fluid flow through the prosthetic valve in the first direction and inhibit fluid flow through the prosthetic valve in the opposite, second direction.

A prosthetic valve comprising:

• a support structure having an inflow end and an outflow end, the support structure configured to be diametrically adjusted from a first diameter at which the prosthetic valve is configured to be implanted to a second diameter that is larger than the first diameter, the support structure including a support portion defining a base, a first leg, a second leg, a first commissure support, and a second commissure support;
• and
• a valve structure arranged within the support structure and coupled to the support portion of the support structure, the valve structure being configured to allow flow in a first direction through the prosthetic valve while inhibiting flow through the prosthetic valve in a second direction that is opposite the first direction when the support structure is at the first diameter and when the support structure is at the second diameter,
• the valve structure including one or more leaflets each having an attachment zone corresponding to a portion of the leaflet that is coupled to the support portion of the support structure, each leaflet defining a base, a free edge, a first commissure region, a second commissure region, and a belly region, and each leaflet being configured such that the free edge coapts at both the first diameter and the second diameter of the support structure.