Tether locking assembly for an endovasular cardiac device

An atrial sealing skirt configured for receiving a valve and for endovascular introduction and implantation at a deployment site and configured and sized to replace a native heart valve, said atrial sealing skirt being configured to substantially conform to an atrial floor adjacent the atrial sealing skirt deployment site and comprising:

• an atrial skirt body which is generally cylindrical, and which defines a valve receptacle;
• an atrial skirt top brim extending circumferentially around an upper edge of said atrial skirt body, and wherein said atrial sealing skirt is compressible when constrained and expands when released from constraints;
• a detachable lock defining a central lumen;
• at least one tether extending through said detachable lock central lumen;
• at least one conduit supported on said tether and defining a cavity configured for receipt of said detachable lock for securing said atrial sealing skirt on said at least one tether to lock said atrial skirt top brim against the atrial floor at the deployment site wherein said conduit is non-integrated with said atrial skirt top brim;
• at least one extension member for supporting said skirt brim, said extension member having a base end adjacent said skirt body upper edge which extends outwardly substantially to an outer edge of said atrial skirt top brim;
• at least one body support for supporting said skirt body;
• and
• a membrane covering said at least one extension member and said at least one body support for forming the atrial skirt top brim and body.