Transcatheter heart valve having paravalvular leakage seal

An endovascular prosthetic heart valve assembly for use in a patient, the heart valve assembly comprising:

• a stent frame configured for being radially expandable from a radially compressed orientation to a radially expanded orientation;
• a leaflet assembly;
• a polymer covering engaging the frame;
• and
• a plurality of flexible fibers that extend outwardly away from the frame,
• wherein the prosthetic heart valve assembly is configured to be endovascularly deployed through a femoral artery of the patient,
• wherein the plurality of fibers is configured for being pressed against native leaflets of the patient when the prosthetic heart valve assembly is endovascularly deployed to the radially expanded orientation within a native heart valve annulus of the patient,
• wherein the prosthetic heart valve assembly defines a spacing extending through a thickness of the plurality of fibers that is created by a distance between adjacent fibers thereof through to the polymer covering,
• wherein, compression of the plurality of fibers in response to expansion of the prosthetic heart valve assembly is configured to compress the plurality of fibers relative to the spacings to create a seal thereabout by reducing a porosity of the spacing.