Repositioning of prosthetic heart valve and deployment

摘要

A collapsible prosthetic heart valve includes a stent and a valve assembly. The stent has an annulus section with a relatively small cross-section, and an aortic section with a relatively large cross-section. The valve assembly, including a cuff and a plurality of leaflets, is secured to the stent in the annulus section such that the valve assembly can be entirely deployed in the native valve annulus and function as intended while at least a portion of the aortic section is held by the delivery device in a manner that allows for resheathing. The configuration of the prosthetic valve is such that the valve leaflets can fully coapt and the valve can function properly even when the stent and/or valve assembly become distorted upon deployment or use.

主权项

1. A prosthetic heart valve, comprising:
a collapsible and expandable stent having a proximal end, a distal end, an annulus section adjacent the proximal end, an aortic section adjacent the distal end, and a plurality of cells having a closed shape disposed continuously in annular rows around a circumference of the stent from the proximal end to the distal end, each of the cells being formed by a plurality of struts and having a first end pointing toward the distal end of the stent and a second end pointing toward the proximal end of the stent, the first end of each cell in a group of cells in the annulus section being connected directly to the second end of an adjacent cell, the annulus section having a first expanded cross-section and the aortic section having a second expanded cross-section larger than the first expanded cross-section; the stent including a plurality of commissure features disposed in the annulus section, each of the commissure features being connected to the first end of one cell in one annular row and the second end of another cell adjacent the one annular row, and each of the commissure features being disposed closer to the proximal end than the another cell; and a collapsible and expandable valve assembly disposed entirely within the annulus section between the proximal end of the stent and the plurality of commissure features, the valve assembly including a plurality of leaflets connected to the plurality of commissure features; the plurality of commissure features being spaced from the distal end of the stent by a selected distance such that the prosthetic valve can be partially deployed from a delivery device at a target site by withdrawing a portion of a sheath of the delivery device from around the prosthetic valve, and the valve assembly can function as intended while the distal end of the stent is held within the sheath of the delivery device in a manner that enables resheathing.