Prosthetic heart valve device and associated systems and methods

A prosthetic heart valve device comprising:

• an inner stent having a first region and a second region;
• a prosthetic valve assembly disposed within the inner stent;
• and
• an outer stent comprising:
• a base attached to the first region of the inner stent;
• a plurality of arms projecting laterally outward from the base and inclined in a direction away from the first region in a deployed state, each arm including a first portion coupled to the base and a second portion;
• and
• a fixation structure extending from the second portion of the arms, the fixation structure having a plurality of struts that define an annular engagement surface configured to press outwardly against a native annulus of a native heart valve;
• wherein the first portion of each arm has a first flexibility and the second portion of each arm as a second flexibility, wherein the first flexibility is greater than the second flexibility.

A prosthetic heart valve device comprising:

• an inner stent;
• a prosthetic valve assembly disposed within and coupled to the inner stent;
• an outer stent comprising a fixation structure configured to press against a native annulus of a native heart valve;
• and
• a plurality of arms connecting the outer stent to the inner stent, wherein each of the arms extends radially outward from the inner stent to the outer stent, each of the plurality of arms comprising:
• a first end;
• a second end;
• a first portion adjacent the first end;
• and
• a second portion disposed between the first portion and the second end, wherein the first portion of each arm is a single strut and the second portion of each arm is two struts such that each arm is Y-shaped, wherein the first portion is a serpentine strut and the second portion is a non-serpentine strut.