Mitral valve annuloplasty ring having a posterior bow

It is a cardiac valve annular formation ring (30) of the priest cap which has the rear curve corresponding to the unusual rear phase of the ring of a mitral valve. A ring (30) has a major axis and a minor axis -- it may be an egg shape mostly. Here, a rear curve is placed in the center along with a minor axis, or may be offset by the rear section (36). The ring is substantially flat, and is obtained or may include the curve to the upper part on both sides of a rear curve. A ring is a suture -- it may have a ring object (30) surrounded with a fiber type sheath [透過], and a ring object may be formed from two or more concentric ring elements (70a, 70b, 70c, 70d). A ring is semi-rigid, and when it is once transplanted and the usual physiological stress is received, a rear curve is hard enough, although it is equal to modification. A ring element (70a, 70b, 70c, 70d) may be a band of half-hard material.