Patent ID: 11957573
Assignee: BOSTON SCIENTIFIC MEDICAL DEVICE LIMITED
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 14:
15. A stent-valve for transcatheter implantation to replace a cardiac valve, the stent-valve being compressible to a compressed state for delivery and expandable to an operative state for implantation, the stent-valve comprising:
a stent;
a plurality of leaflets for defining a prosthetic valve; and
a seal for sealing against surrounding tissue, the seal including an inner skirt disposed on an interior of the stent, an outer skirt disposed on an exterior of the stent, and a seal support, the inner skirt and outer skirt together defining one or more pocket, wherein a portion of the stent extends beyond the pocket towards both an inflow end and an outflow end of the stent-valve, wherein a portion of the outer skirt defining each pocket is biased radially outwardly to distend away from the body of the stent such that each pocket defines an open mouth facing towards the outflow end of the stent, and an end of the pocket opposite the mouth in the direction towards the inflow end of the stent is closed, wherein the seal support comprises a plurality of cantilever elements fixed directly to the stent and biased radially outward from the stent and holding the mouth of the pocket open and radially outward away from the body of the stent, wherein the seal is configured such that blood flow in a reverse direction from the outlet to the inlet biases the seal pocket to a deployed in an open state to obstruct such flow.