Sealing member for prosthetic heart valve
An implantable prosthetic valve can comprise an annular frame comprising an inflow end and an outflow end and being radially collapsible and expandable between a radially collapsed configuration and a radially expanded configuration, the frame defining an axial direction extending from the inflow end to the outflow end, a leaflet structure positioned within the frame and secured thereto, and an outer sealing member positioned around an outer surface of the frame, wherein the outer sealing member comprises a plurality of sealing segments, wherein each sealing segment is coupled to the frame and/or another sealing segment by a tether that pulls a portion of the sealing segment in a circumferential direction when the frame is radially expanded to the expanded configuration.
1. An implantable prosthetic valve comprising:
an annular frame comprising an inflow end and an outflow end and being radially collapsible and expandable between a radially collapsed configuration and a radially expanded configuration, the frame defining an axial direction extending from the inflow end to the outflow end;
a leaflet structure positioned within the frame and secured thereto; and
an annular outer skirt positioned around an outer surface of the frame, wherein the outer skirt comprises:
an inflow edge portion secured to the frame at a first location;
an outflow edge portion secured to the frame at a second location;
an intermediate portion between the inflow edge portion and the outflow edge portion, wherein the intermediate portion comprises a plurality of circumferentially spaced, axially extending slits that define a plurality of skirt segments between each pair of slits, wherein each skirt segment comprises first and second opposing edge portions; and
a plurality of tethers, wherein each tether is secured to the first edge portion of a skirt segment at a first end of the tether, extends across the second edge portion of the same skirt segment, and is secured to the frame or an adjacent skirt segment at a second end of the tether such that when the frame is expanded to the radially expanded configuration, the first edge portion is pulled in a circumferential direction toward the second edge portion by the tether.
2. The prosthetic valve of claim 1 , wherein the second end of each tether is secured to the frame.
3. The prosthetic valve of claim 1 , wherein the second end of each tether is secured to the frame at a location adjacent to the second edge portion of the skirt segment that the first end of the tether is secured to.
4. The prosthetic valve of claim 1 , wherein the frame comprises a plurality of struts and the second end of each tether is secured to the frame at a strut adjacent to the second edge portion of the skirt segment that the first end of the tether is secured to.
5. The prosthetic valve of claim 1 , wherein each tether is positioned radially outside of the skirt segment.
6. The prosthetic valve of claim 1 , wherein each tether is positioned radially inside of the skirt segment.
7. The prosthetic valve of claim 1 , wherein the tethers comprise a first set of tethers positioned radially outside of the skirt segment and a second set of tethers positioned radially inside of the skirt segment.
8. The prosthetic valve of claim 1 , wherein:
the plurality of tethers comprises a plurality of first tethers and a plurality of second tethers,
each first tether has a first end secured to the first edge portion of a respective skirt segment, extends across the second edge portion of the same skirt segment, and has a second end secured to the frame at a first location, and
each second tether has a first end secured to the second edge portion of a respective skirt segment, extends across the first edge portion of the same skirt segment, and has a second end secured to the frame at second location, the first and second locations being adjacent opposite sides of the skirt segment such that when the frame is expanded to the radially expanded configuration, the second tether pulls the second edge portion toward the first edge portion and the first tether pulls the first edge portion toward the second edge portion.
9. The prosthetic valve of claim 8 , wherein the first tethers are positioned radially outside of the outer skirt and the second tethers are positioned radially inside of the outer skirt.
10. The prosthetic valve of claim 8 , wherein the first tethers and the second tethers are each positioned radially outside of the outer skirt.
11. The prosthetic valve of claim 8 , wherein the first tethers and the second tethers are each positioned radially inside of the outer skirt.
12. The prosthetic heart valve of claim 1 , wherein the second end of each tether is secured to an adjacent skirt segment.
13. The prosthetic valve of claim 12 , wherein:
the plurality of tethers comprises a plurality of first tethers and a plurality of second tethers, and
each skirt segment is coupled to a first adjacent skirt segment by a respective first tether and a second adjacent skirt segment by a respective second tether, such that when the frame is expanded to the radially expanded configuration, the first and second tethers pull the first and second edge portions of the skirt segment toward each other.
14. The prosthetic valve of claim 13 , wherein for each skirt segment, a first tether extends from the first edge portion of the skirt segment across the second edge portion and is secured to the first adjacent skirt segment, and a second tether extends from the second edge portion of the skirt segment across the first edge portion, and is secured to the second adjacent skirt segment.
15. The prosthetic valve of claim 13 , wherein the plurality of first tethers are positioned radially inside of the outer skirt and the plurality of second tethers are positioned radially outside of the outer skirt.