Abstract: An ultrasonic therapeutic apparatus includes a handle, a horn or concentrator section terminating in an operative tip, and a transducer assembly set disposed in the handle and operatively engaged with the horn or concentrator section for generating ultrasonic mechanical vibrations therein to vibrate the operative tip during contact thereof with target tissue at a surgical site in a patient. An electrical waveform generator is operatively connected to the transducer assembly for energizing the transducer assembly set with one or more predetermined time reversal ultrasonic waveforms that, upon being applied to the transducer assembly set, result in respective predetermined patterns of motion of the operative tip.

Abstract: Ablation apparatus such as a catheter carrying an ultrasonic ablation device including an ablation transducer and a balloon reflector structure for directing ultrasonic energy from the ablation transducer into a ring-like ablation region is provided with an imaging ultrasonic transducer mounted on an imaging probe which may be inserted into or through a passageway extending through the catheter and into or through the ablation device to image the ablation region or neighboring regions. Alternatively, the imaging transducer may be mounted within the balloon reflector structure or distal to this structure.

Abstract: An ultrasonic therapeutic apparatus includes a handle, a horn or concentrator section terminating in an operative tip, and a transducer assembly set disposed in the handle and operatively engaged with the horn or concentrator section for generating ultrasonic mechanical vibrations therein to vibrate the operative tip during contact thereof with target tissue at a surgical site in a patient. An electrical waveform generator is operatively connected to the transducer assembly for energizing the transducer assembly set with one or more predetermined time reversal ultrasonic waveforms that, upon being applied to the transducer assembly set, result in respective predetermined patterns of motion of the operative tip.

Abstract: An ultrasonic therapeutic apparatus includes a handle, a horn or concentrator section terminating in an operative tip, and a transducer assembly set disposed in the handle and operatively engaged with the horn or concentrator section for generating ultrasonic mechanical vibrations therein to vibrate the operative tip during contact thereof with target tissue at a surgical site in a patient. An electrical waveform generator is operatively connected to the transducer assembly for energizing the transducer assembly set with one or more predetermined time reversal ultrasonic waveforms that, upon being applied to the transducer assembly set, result in respective predetermined patterns of motion of the operative tip.

Abstract: Ablation apparatus such as a catheter carrying an ultrasonic ablation device including an ablation transducer and a balloon reflector structure for directing ultrasonic energy from the ablation transducer into a ring-like ablation region is provided with an imaging ultrasonic transducer mounted on an imaging probe which may be inserted into or through a passageway extending through the catheter and into or through the ablation device to image the ablation region or neighboring regions. Alternatively, the imaging transducer may be mounted within the balloon reflector structure or distal to this structure.

Abstract: Ablation apparatus such as a catheter (10) carrying an ultrasonic ablation device (20) including an ablation transducer (42) and a balloon reflector structure (22, 24) for directing ultrasonic energy from the ablation transducer into a ring-like ablation region (A) is provided with an imaging ultrasonic transducer (86) mounted on an imaging probe (80) which may be inserted into or through a passageway (18, 65) extending through the catheter and into or through the ablation device to image the ablation region or neighboring regions. Alternatively, the imaging transducer (102, 202) may be mounted within the balloon reflector structure or distal to this structure.

Abstract: An ultrasound transducer assembly includes an acoustic focusing lens and a therapy transducer mounted to a holder member so that the lens is movable relative to the transducer. The lens and the transducer are mounted to the holder member so that the lens is spaced a predetermined distance from the transducer element. A liquid layer having a thickness of the predetermined distance is provided between the lens and the transducer element. A solid backing member is disposed on a side of the transducer element opposite the lens. The backing member is spaced by an additional liquid layer of a predetermined thickness from the transducer element. The focusing depth of the lens—transducer assembly is controllable by transducer operating frequency.

Abstract: An ultrasound transducer assembly includes an acoustic focusing lens and a therapy transducer mounted to a holder member so that the lens is movable relative to the transducer. The lens and the transducer are mounted to the holder member so that the lens is spaced a predetermined distance from the transducer element. A liquid layer having a thickness of the predetermined distance is provided between the lens and the transducer element. A solid backing member is disposed on a side of the transducer element opposite the lens. The backing member is spaced by an additional liquid layer of a predetermined thickness from the transducer element. The focusing depth of the lens-transducer assembly is controllable by transducer operating frequency.

Abstract: A compact, high power, dual mode, emitting and receiving ultrasound transducer and method for applying ultrasonic energy within a living subject and for monitoring the effects it induces in tissue comprises a set of piezoelectric polymeric transducer elements and a set of piezoelectric ceramic elements, bonded together. The polymeric transducer elements have electrodes enabling their use for low power diagnostic imaging interrogation of the tissue and the ceramic transducer elements have electrodes enabling their use for high power therapy applications.

Abstract: A compact, high power, dual mode, emitting and receiving ultrasound transducer and method for applying ultrasonic energy within a living subject and for monitoring the effects it induces in tissue comprises a set of piezoelectric polymeric transducer elements and a set of piezoelectric ceramic elements, bonded together. The polymeric transducer elements have electrodes enabling their use for low power diagnostic imaging interrogation of the tissue and the ceramic transducer elements have electrodes enabling their use for high power therapy applications.

Abstract: A compact, high power, dual mode, emitting and receiving ultrasound transducer and method for applying ultrasonic energy within a living subject and for monitoring the effects it induces in tissue comprises a set of piezoelectric polymeric transducer elements and a set of piezoelectric ceramic elements, bonded together. The polymeric transducer elements have electrodes enabling their use for low power diagnostic imaging interrogation of the tissue and the ceramic transducer elements have electrodes enabling their use for high power therapy applications.

Abstract: An ultrasound transducer assembly includes an acoustic focusing lens and a therapy transducer mounted to a holder member so that the lens is movable relative to the transducer. The lens and the transducer are mounted to the holder member so that the lens is spaced a predetermined distance from the transducer element. A liquid layer having a thickness of the predetermined distance is provided between the lens and the transducer element. A solid backing member is disposed on a side of the transducer element opposite the lens. The backing member is spaced by an additional liquid layer of a predetermined thickness from the transducer element. The focusing depth of the lens-transducer assembly is controllable by transducer operating frequency.

Abstract: A compact, high power, dual mode, emitting and receiving ultrasound transducer and method for applying ultrasonic energy within a living subject and for monitoring the effects it induces in tissue comprises a set of piezoelectric polymeric transducer elements and a set of piezoelectric ceramic elements, bonded together. The polymeric transducer elements have electrodes enabling their use for low power diagnostic imaging interrogation of the tissue and the ceramic transducer elements have electrodes enabling their use for high power therapy applications.

Abstract: An ultrasound transducer assembly includes an acoustic focusing lens and a therapy transducer mounted to a holder member so that the lens is movable relative to the transducer. The lens and the transducer are mounted to the holder member so that the lens is spaced a predetermined distance from the transducer element. A liquid layer having a thickness of the predetermined distance is provided between the lens and the transducer element. A solid backing member is disposed on a side of the transducer element opposite the lens. The backing member is spaced by an additional liquid layer of a predetermined thickness from the transducer element. The focusing depth of the lens-transducer assembly is controllable by transducer operating frequency.

Abstract: An ultrasonic therapeutic apparatus includes a handle, a horn or concentrator section terminating in an operative tip, and a transducer assembly set disposed in the handle and operatively engaged with the horn or concentrator section for generating ultrasonic mechanical vibrations therein to vibrate the operative tip during contact thereof with target tissue at a surgical site in a patient. An electrical waveform generator is operatively connected to the transducer assembly for energizing the transducer assembly set with one or more predetermined time reversal ultrasonic waveforms that, upon being applied to the transducer assembly set, result in respective predetermined patterns of motion of the operative tip.

Abstract: A cardiac ablation device treats atrial fibrillation by directing and focusing ultrasonic waves into a ring-like ablation region (A). The device desirably is steerable and can be moved between a normal disposition, in which the ablation region lies parallel to the wall of the heart for ablating a loop-like lesion, and a canted disposition, in which the ring-like focal region is tilted relative to the wall of the heart, to ablate only a short, substantially linear lesion. The ablation device desirably includes a balloon reflector structure (18, 1310) and an ultrasonic emitter assembly (23, 1326), and can be steered and positioned without reference to engagement between the device and the pulmonary vein or ostium. A contrast medium (C) can be injected through the ablation device to facilitate imaging, so that the device can be positioned based on observation of the images.

Abstract: A cardiac ablation device treats atrial fibrillation by directing and focusing ultrasonic waves into a ring-like ablation region (A). The device desirably is steerable and can be moved between a normal disposition, in which the ablation region lies parallel to the wall of the heart for ablating a loop-like lesion, and a canted disposition, in which the ring-like focal region is tilted relative to the wall of the heart, to ablate only a short, substantially linear lesion. The ablation device desirably includes a balloon reflector structure (18, 1310) and an ultrasonic emitter assembly (23, 1326), and can be steered and positioned without reference to engagement between the device and the pulmonary vein or ostium. A contrast medium (C) can be injected through the ablation device to facilitate imaging, so that the device can be positioned based on observation of the images.

Abstract: Apparatus and methods for ablating tissue such as cardiac tissue. The apparatus includes a probe carrying a first ablation element 11 which may include an ultrasonic transducer and a balloon structure which directs the ultrasonic energy, and an additional ablation element 17 located distal to the first ablation element. The mode of operation of the additional ablation element 17 may be different from that of the first ablation element 20. Both ablation elements may be positioned by positioning the probe. The first ablation element may be arranged to form a loop-like lesion, whereas the additional ablation element may be arranged to form a spot-like lesion.

Abstract: Ablation apparatus such as a catheter (10) carrying an ultrasonic ablation device (20) including an ablation transducer (42) and a balloon reflector structure (22, 24) for directing ultrasonic energy from the ablation transducer into a ring-like ablation region (A) is provided with an imaging ultrasonic transducer (86) mounted on an imaging probe (80) which may be inserted into or through a passageway (18, 65) extending through the catheter and into or through the ablation device to image the ablation region or neighboring regions. Alternatively, the imaging transducer (102, 202) may be mounted within the balloon reflector structure or distal to this structure.

Abstract: A balloon catheter is provided with a sleeve and a flexible material where, upon inflation of the balloon, the sleeve is slid over a ball joint, preventing the flexible material and tube from moving through a range of motion in order to prevent the tube from kinking and misaligning.