Radiopaque outer cuff for transcatheter valve
View Patent ↗A prosthetic heart valve for replacing a native valve includes a stent having a plurality of struts, an inflow end, an outflow end, a collapsed condition and an expanded condition. A valve assembly is disposed within the stent. A first cuff is annularly disposed adjacent the stent, and a second cuff is annularly disposed about the stent radially outward of the first cuff and radially outward of the stent. The second cuff is at least partly radiopaque and may assist in determining the relative position between the second cuff and a patient's anatomy using fluoroscopy during an implantation procedure.
1. A prosthetic heart valve for replacing a native valve, comprising:
a stent having a plurality of struts, an inflow end, an outflow end, a collapsed condition and an expanded condition;
a valve assembly disposed within the stent;
a first cuff annularly disposed adjacent the stent; and
a second cuff having a proximal end adjacent the inflow end of the stent and a distal end spaced apart from the proximal end, the second cuff being annularly disposed about the stent radially outward of the first cuff and radially outward of the stent;
wherein the second cuff overlaps with the first cuff along a longitudinal direction of the stent, thereby creating a space between the first cuff and the second cuff configured to receive retrograde blood flow therewithin, and
wherein the second cuff is at least partly radiopaque, the second cuff being formed of a fabric that includes a plurality of first fiber portions extending in a first fiber direction and a plurality of second fiber portions extending in a second fiber direction, each of the first fiber portions is radiolucent and at least one of the second fiber portions is radiopaque,
wherein the plurality of struts includes a plurality of radiopaque struts, the second cuff being less radiopaque than the plurality of radiopaque struts;
wherein a radiopacity of the second cuff is configured, based on a spacing of radiopaque fibers of the second cuff, to be less radiopaque than the plurality of radiopaque struts; and
wherein the proximal end of the second cuff is coupled to the stent by sutures.
2. The prosthetic heart valve of claim 1 , wherein the first cuff is radiolucent.
3. The prosthetic heart valve of claim 1 , wherein a multiplicity of the second fiber portions is radiopaque, each of the radiopaque second fiber portions being separated from an adjacent one of the radiopaque second fiber portions by at least one radiolucent second fiber portion.
4. The prosthetic heart valve of claim 1 , wherein the first fiber direction is substantially orthogonal to the second fiber direction.
5. The prosthetic heart valve of claim 4 , wherein the stent has a central longitudinal axis extending between the inflow end and the outflow end, the first fiber direction and second fiber direction both being oblique to the central longitudinal axis.
6. The prosthetic heart valve of claim 4 , wherein the stent has a central longitudinal axis extending between the inflow end and the outflow end, one of the first fiber direction and second fiber direction being orthogonal to the central longitudinal axis.
7. The prosthetic heart valve of claim 1 , wherein the fabric of the second cuff includes barium sulfate or bismuth trioxide.