Stationary intra-annular halo designs for paravalvular leak (PVL) reduction—active channel filling cuff designs
A prosthetic heart valve may include a collapsible and expandable stent extending in a flow direction between a proximal end and a distal end, a cuff attached to an annulus section of the stent and having an outer surface facing in a radial direction orthogonal to the flow direction, a plurality of prosthetic valve leaflets attached to the cuff, and a sealing structure attached to the annulus section of the stent at an inner edge of the sealing structure. The flow direction may be defined from the proximal end toward the distal end. The sealing structure may have an outer edge remote from the inner edge. The sealing structure may have a collapsed condition with the outer edge disposed adjacent the outer surface of the cuff and an expanded condition with the outer edge spaced apart from the outer surface of the cuff.
1. A prosthetic heart valve configured to be expanded in an annulus of a native aortic valve of a patient, the prosthetic heart valve comprising:
a collapsible and expandable stent extending in a flow direction between a proximal end and a distal end, the stent including an annulus section adjacent the proximal end and a plurality of struts shaped to form a plurality of cells connected to one another in a plurality of annular rows around the stent, the flow direction being the direction from the proximal end toward the distal end;
a cuff attached to the annulus section of the stent and having an outer surface facing in radial directions orthogonal to the flow direction;
a plurality of prosthetic valve leaflets attached to the cuff; and
a plurality of sealing members each attached to the annulus section of the stent, each sealing member having a first end, a second end, an open side facing toward the distal end of the stent and a closed side facing toward the proximal end of the stent so that blood flowing in a direction opposite the flow direction will enter at least one of the sealing members through the open side and cause an outer surface of the at least one sealing member to move away from the outer surface of the cuff, each sealing member having a maximum width in a circumferential direction of the stent from the first end to the second end, the maximum width of each of the sealing members in a first group of the sealing members being greater than the maximum width of each of the sealing members in a second group of the sealing members.
2. The prosthetic heart valve of claim 1 , wherein each sealing member has a shape selected from the group consisting of triangular, crescent-shaped, rectangular, or square.
3. The prosthetic heart valve of claim 1 , wherein each leaflet is attached to the cuff along a belly portion, the belly portion including an attachment point at which the leaflet is closest to the proximal end of the stent, each of the attachment points is at a predetermined distance from the proximal end of the stent, and each of the sealing members is located entirely between the proximal end of the stent and the predetermined distance from the proximal end of the stent.
4. The prosthetic heart valve of claim 1 , wherein the stent includes commissure features each located at a juncture of adjacent ones of the leaflets, at least a portion of each leaflet being attached to one of the commissure features, and each of the sealing members is substantially aligned in the flow direction with a corresponding one of the commissure features.
5. The prosthetic heart valve of claim 1 , wherein
the stent includes commissure features each located at a juncture of adjacent ones of the leaflets, at least a portion of each leaflet being attached to one of the commissure features, the sealing members in the first group being substantially aligned in the flow direction with the commissure features.
6. The prosthetic heart valve of claim 5 , wherein each leaflet is attached to the cuff along a belly portion, the belly portion including an attachment point at which the leaflet is closest to the proximal end of the stent, and each of the sealing members in the second group is substantially aligned in the flow direction with a respective one of the attachment points.
7. The prosthetic heart valve of claim 1 , wherein the sealing members in the first group alternate with the sealing members in the second group around a circumference of the stent.