Esophageal stent including a valve member
An example medical device is disclosed. An example medical device includes an expandable stent. The stent includes a tubular scaffold formed of one or more interwoven filament. The tubular scaffold includes an inner surface and a flexible valve extending radially inward from the inner surface of the scaffold. Further, the valve is configured to shift between a closed configuration and an open configuration and the one or more filaments of the scaffold bias the valve to the closed configuration while in a nominally deployed state.
1. An expandable stent, comprising:
a tubular scaffold formed of one or more interwoven filaments, the tubular scaffold defining a lumen and including an inner surface and an outer surface; and
a flexible valve extending radially inward from the inner surface of the tubular scaffold;
wherein the one or more filaments of the scaffold are configured to shift the flexible valve from an open configuration to a closed configuration;
wherein the one or more filaments are biased radially inward to hold the flexible valve in the closed configuration while in a nominally deployed state.
2. The stent of claim 1 , wherein the valve is configured to shift from the closed configuration to the open configuration due to a peristaltic force applied to the tubular scaffold.
3. The stent of claim 1 , wherein the valve includes a valve opening extending therethrough, and wherein the valve opening is ovular-shaped in the open configuration.
4. The stent of claim 1 , where the tubular scaffold includes a narrowed region and the valve is positioned in the narrowed region.
5. The stent of claim 1 , wherein the one or more filaments of the scaffold are configured to radially expand to shift the valve from the closed configuration to the open configuration when subjected to a radial expansion force of 0.200 N/cm 2 or greater.
6. The stent of claim 1 , wherein the one or more filaments of the scaffold are configured to radially expand to shift the valve from the closed configuration to the open configuration when subjected to a radial expansion force of 0.800 N/cm 2 or greater.
7. The stent of claim 1 , further comprising a coating disposed along the one or more filaments, and wherein the valve is formed from a portion of the coating.
8. The stent of claim 7 , wherein the tubular scaffold has a first end, a second end, and a length extending therebetween, wherein the coating extends along an entirety of the length of the tubular scaffold.
9. The stent of claim 7 , wherein the coating extends along only the inner surface of the tubular scaffold.
10. The stent of claim 7 , wherein the coating extends along both the inner and outer surfaces of the tubular scaffold.
11. The stent of claim 1 , wherein the valve is an annular member extending continuously around the lumen of the tubular scaffold.
12. The stent of claim 1 , wherein the tubular scaffold has an hourglass shape with a narrowed waist in the closed configuration, wherein the valve is disposed within the narrowed waist.
13. The stent of claim 12 , wherein the one or more interwoven filaments are heat set in the hourglass shape.
14. The stent of claim 1 , wherein the one or more interwoven filaments form one or more flanges defining regions of increased diameter.
15. An expandable stent, comprising:
a tubular scaffold formed of a plurality of interwoven filaments, the tubular scaffold including a first end, a second end and a lumen extending therethrough; and
a flexible valve defined within the lumen;
wherein the plurality of interwoven filaments are configured to move the flexible valve from an open configuration to a closed configuration;
wherein the plurality of interwoven filaments apply a radially compressive force on the valve to bias the valve in the closed configuration while the stent is in a nominally deployed state.
16. The stent of claim 15 , wherein the tubular scaffold includes a narrowed region positioned between the first end and the second end, wherein the valve is formed in the narrowed region.
17. The stent of claim 15 , wherein the radially compressive force is less than or equal to 0.800 N/cm2.
18. The stent of claim 15 , further comprising a coating disposed along the plurality of filaments, and wherein the valve is formed from a portion of the coating.
19. An expandable stent, comprising:
a tubular scaffold having a first end, a second end, and defining a lumen extending therebetween; and
a flexible valve extending radially inward from the inner surface of the tubular scaffold;
wherein the tubular scaffold is configured to shift the flexible valve from an open configuration to a closed configuration;
wherein the tubular scaffold is biased to hold the valve in the closed configuration while in a nominally deployed state.
20. The stent of claim 19 , wherein the tubular scaffold includes a narrowed region positioned between the first and second ends, and wherein the valve is positioned in the narrowed region.