A prosthetic mitral valve (100) includes a proximal anchor (2), a distal anchor (3), and a central portion (4) therebetween. The proximal and distal anchors each include a first outer frame and a second outer frame. The first outer frame includes a plurality of first arcs joined together, and the second outer frame includes a plurality of second arcs joined together. The plurality of first arcs are out of phase relative to the plurality of second arcs.The frame comprises retention hooks (21) for gripping cardiac tissue.n
