Valve Prosthesis

A valve prosthesis comprising:

• a flexible shutter and an annular carrier structure that is radially rigid and suitable for being surgically-implanted at the location of a heart valve;
• the prosthesis further comprising:
• an interchangeable prosthetic valve independent of the carrier structure for putting into place by an endoluminal approach through said annular carrier structure and comprising:
• a tubular support that is radially deformable relative to a main axis between a folded position for putting into place, and a deployed position implanted in the carrier structure, in which the tubular support bears at its periphery against the carrier structure;
• said flexible shutter being connected to the tubular support and deformable between an obstruction position in which it is extended transversally and a release position in which it is contracted transversally under the action of the blood flowing through the tubular support;
• wherein the carrier structure forms an annular support having no shutter suitable for restricting the flow of blood to one direction only;
• wherein the tubular support defines a solid cylindrical wall that is liquid proof;
• and
• wherein the tubular support comprises a tubular lattice covered in a stretchable film that is liquid-proof and that forms said solid cylindrical wall.