Abstract: The present disclosure provides a device having a circuit. The circuit includes at least one boost converter receiving power from an energy source, a square wave driver in series with the boost converter, an inductor in series with the square wave driver for converting a square wave to a sinusoidal wave, and a piezoelectric transducer in series with the inductor, the piezoelectric transducer connectable to a load. The device further includes a phase-locked loop coupled to the circuit to determine a resonance frequency of the piezoelectric transducer when the piezoelectric transducer is connected to the load.

Abstract: A vascular graft device includes a semipermeable inner wall surrounding a passage. A nonpermeable outer wall surrounds the inner wall. A biological agent is disposed between the inner and outer walls for release through the inner wall.

Abstract: A vascular graft device includes a semipermeable inner wall surrounding a passage. A nonpermeable outer wall surrounds the inner wall. A biological agent is disposed between the inner and outer walls for release through the inner wall.

Abstract: A biological agent delivery device for delivering biological agents includes a sheath having a longitudinally extending wall surrounding an interior region, and a closed tip at a distal end. A flexible pouch formed in the sheath wall for containing a biological agent is capable of being displaced radially outwardly for radially displacing the biological agent.

Abstract: A device for delivering biological agents includes a cannula for insertion into tissue having a distal end with a notch formed therein. A flexible membrane extending across the cannula notch has a surface for supporting a quantity of a biological agent. A temperature controlled fluid is disposed within the cannula for displacing the support surface of the membrane laterally with respect to the cannula to deliver the biological agent with precision to a tissue site or body cavity.

Abstract: An occluder for a prosthetic heart valve assembly adapted within a seating-ring passage having a body including a downstream sealing section comprising a plurality of cuspids which engage each other to define a closed sealing section when the occluder is in its closed position and which flex outwardly relative to each other when the occluder is in its open position to define a central open passage through the occluder, and an armature reinforcing the body. The armature includes an annular ring and a plurality of reinforcing arms hingedly connected to the ring and extending through each cuspid to permit flexure of each arm relative to the annular ring.