Compound MOS capacitors and phase-locked loop with the compound MOS capacitors are disclosed. The valve head has the form of a circular plate and has an edge with a triangular outline; cooperating with the gasket of the valve. The device partitions blood within the heart, and protects the heart from excessive volume and pressure of blood. The second support members are arranged relative to the first resilient support members such that the second support members contact the edge of the component if corresponding ones of the first resilient support members deflect a sufficient amount. The object can be achieved by a support material comprising a Ti\u2014Nb composite oxide having rutile crystal structure,.