Prosthetic heart valve

A prosthetic heart valve, comprising:

• a collapsible and expandable annular frame that is configured to be collapsed to a radially collapsed state for mounting on a delivery apparatus and expanded to a radially expanded state inside the body, the frame having an inflow end, an outflow end, and a longitudinal axis extending from the inflow end to the outflow end, the frame comprising a plurality of struts defining a plurality of rows of a plurality of cells, including a first, inflow row of cells defining the inflow end of the frame, a second row of cells downstream of the first row of cells, a third row of cells downstream of the second row of cells, and a fourth, outflow row of cells defining the outflow end of the frame;
• a leaflet assembly mounted within the frame, wherein the leaflet assembly comprises a plurality of leaflets, wherein each leaflet comprises an inflow end portion and an outflow end portion, wherein adjacent leaflets are connected to each other at the outflow end portions to form commissures of the leaflet assembly, wherein each commissure is secured to one of the cells of the fourth row of cells with sutures;
• a first skirt mounted on the frame, wherein the first skirt has an inflow end portion and an outflow end portion, wherein the inflow end portions of the leaflets are sutured to the outflow end portion of the first skirt along an undulating suture line, wherein the outflow end portion of the first skirt has an undulating shape that substantially corresponds with the undulating suture line, wherein the first skirt covers cells of the first and second rows of cells;
• and
• a second skirt mounted on the frame radially outward from the first skirt, wherein the second skirt has an inflow end portion and an outflow end portion;
• wherein the first skirt extends from the inflow end of the frame and overlaps the second skirt along an inflow end portion of the frame and extends beyond the outflow end portion of the second skirt in a direction toward the outflow end of the frame.