摘要:
An ultrasound catheter system and a method for operating an ultrasonic catheter at a treatment site within a patient's vasculature or tissue are disclosed. The ultrasound catheter system comprises a catheter having at least one ultrasonic element and a control system configured to generate power parameters that drive the at least one ultrasonic element to generate ultrasonic energy. The control system is configured to vary at least one of the power parameters and at least one physiological parameter by repeatedly cycling the power parameter and the physiological parameter through two set of values.
摘要:
A power assisted method and injector device for controllably delivering to patients a dispersion medicament or diagnostically active agent, the homogeneity of which is preserved throughout delivery. Diagnostically active agents disclosed are gas microbubble suspensions useful in ultrasonic diagnostic imaging and liposomal formulations in which liposome vesicles are loaded with iodinated compounds.
摘要:
There is provided in accordance with an exemplary embodiment of the invention an ultrasound transducer for intrabody medical therapy comprising; an element adapted to transmit ultrasound energy; at least two electrodes configured to apply a voltage across at least some volume of the element; and a gas bubble containment area adapted to retain the gas bubble when in blood.
摘要:
A dual use ultrasonic transducer device for combined sensing and power transmission, comprises a first piezoelectric transducer sized for placement in a body lumen; a power unit enabling an ultrasonic power beam for tissue ablation in a tissue ablation region; and a sensing unit enabling an ultrasonic sensing beam for sensing at said tissue ablation region. In one example, a single piezoelectric surface is electrically connected to a mounting; and the mounting provides a first region of the piezoelectric surface with a first relatively high level of damping and a second region of said piezoelectric surface with a second relatively low level of damping, thereby to enable sensing from said first region and power transmission from said second region. Changes in efficiency of the transducer or the treatment during use may be inferred from changes in the impulse response or impedance or changes in the temperature of liquids that have flowed past the transducer.
摘要:
Methods for removing blockages from intracranial drainage catheters caused by cerebrospinal fluid or blood clots using ultrasound energy are provided. These blockages may be caused by cerebrospinal fluid or blood clots located inside or outside of the drainage catheter. One or more pharmacologic agents may be delivered to the treatment area to further facilitate the dissolving and removal of blockages.
摘要:
An ultrasonic treatment apparatus includes a sheath which has an opening at a distal-end thereof; an ultrasonic transducer which is connected to the sheath, the ultrasonic transducer being able to generate ultrasonic vibration which is of treatment energy; an ultrasonic power supply unit which supplies electric power for driving the ultrasonic transducer; a treatment unit which is connected to the ultrasonic transducer, the treatment unit transmitting the ultrasonic vibration to a living tissue; and a high-frequency power supply unit which supplies high-frequency current which is of the treatment energy to the treatment unit.
摘要:
A method of using ultrasound waves that are focused at a specific location in a medium is provided to cause localized production of bubbles at that location and to control the production, and the cavitational and heating effects that take place there. Production and control are accomplished by interference-specific waveforms at the focal point, which are not produced at other locations. Preferably, the region within the focal zone of all the transducers in which the specific waveform develops at significant intensities are very small. The method, and a system that performs the method, can be used to perform a variety of therapeutic procedures. Typical of such procedures is occlusion of varicose veins.
摘要:
A medical imaging and therapy device is provided that may include any of a number of features. One feature of the device is that it can image a target tissue volume and apply ultrasound energy to the target tissue volume. In some embodiments, the medical imaging and therapy device is configured controllably apply ultrasound energy into the prostate by maintaining a cavitational bubble cloud generated by an ultrasound therapy system within an image of the prostate generated by an imaging system. The medical imaging and therapy device can be used in therapeutic applications such as Histotripsy, Lithotripsy, and HIFU, for example. Methods associated with use of the medical imaging and therapy device are also covered.
摘要:
Various methods and devices are provided for cutting tissue using a high pressure fluid jet. In one exemplary embodiment, a high pressure fluid jet delivery device is provided having a nozzle adapted to direct fluid to a tissue site. A heating element is disposed on the nozzle and is adapted to heat fluid surrounding a high pressure fluid jet flowing from the nozzle to form at least one vapor bubble. The vapor bubble can reduce the interaction between the high pressure fluid jet and the fluid surrounding the high pressure fluid jet.
摘要:
An ultrasound operation apparatus includes an ultrasound transducer; a drive section that drives the ultrasound transducer using a drive signal; a probe that has a proximal end section in which the ultrasound transducer is provided and a distal end section to which ultrasound vibrations are transmitted, and that performs treatment for living tissue by using ultrasound vibrations at the distal end section; a resonance frequency tracking section that drives so as to cause ultrasound vibrations to be generated at a resonance frequency; a detection section that detects a frequency component signal of a frequency component other than a resonance frequency of the drive signal; and a cavitation suppression control section that controls so as to suppress or eliminate cavitations according to the detection result.