Sealing structures for paravalvular leak protection

A prosthetic heart valve for replacing a native valve, comprising:

• a collapsible and expandable stent having a proximal end, a distal end, and a plurality of struts forming rows of cells;
• a valve assembly disposed within the stent, the valve assembly including:
• a plurality of leaflets, each leaflet having an attached edge and a free edge;
• and
• a cuff annularly disposed on a surface of the stent to cover at least one row of cells, and having an attached end coupled to the stent at a location distal to the attached edges of the plurality of leaflets;
• and
• a sealing ring for sealing gaps between the prosthetic heart valve and a native valve annulus, the sealing ring being formed of a braided fabric having a free end extending proximally of the proximal end of the stent and having a memory bias such that the free end is configured to roll over itself in a rolling direction at least one full revolution around a circumferentially-extending central axis toward the distal end of the stent,
• wherein the stent includes elongated legs extending away from the distal end of the stent and coupled to the sealing ring, the elongated legs being formed of a shape memory material having a memory bias towards a rolled shape in which the elongated legs curl in the rolling direction around the circumferentially-extending central axis.

A prosthetic heart valve for replacing a native valve, comprising:

• a collapsible and expandable stent having a proximal end, a distal end, and a plurality of struts forming rows of cells, the stent being movable between collapsed and deployed conditions, the stent in a deployed condition having a first diameter adjacent the proximal end, and a second diameter adjacent the distal end, the second diameter being greater than the first diameter;
• a valve assembly disposed within the stent, the valve assembly including:
• a plurality of leaflets, each leaflet having an attached edge and a free edge;
• and
• a cuff annularly disposed on a surface of the stent to cover at least one row of cells, and having an attached end coupled to the stent at a location distal to the attached edges of the plurality of leaflets;
• and
• a sealing ring for sealing gaps between the prosthetic heart valve and a native valve annulus, the sealing ring being formed of a braided fabric that in the collapsed condition of the stent has a free end extending proximally of the proximal end of the stent, the braided fabric having a memory bias such that the free end is configured to roll over itself, and
• the braided fabric in the deployed condition of the stent having the free end rolled over itself in a rolling direction at least one full revolution around a circumferentially-extending central axis toward the distal end of the stent, the sealing ring having an outer sealing diameter that is greater than the first diameter, but smaller than the second diameter,
• wherein the stent includes elongated legs extending away from the distal end of the stent and coupled to the sealing ring, the elongated legs being formed of a shape memory material having a memory bias towards a rolled shape in which the elongated legs curl in the rolling direction around the circumferentially-extending central axis.