Transmyocardial revascularization using ultrasound
First Claim
1. An ultrasonic system for selectively and non-invasively vaporizing body tissue, the system comprising:
- an extracorporeal array of ultrasonic transducers, each of said transducers being capable of producing an ultrasonic wave; and
a plurality of channel driving systems, each of said channel driving systems being coupled to one of said transducers and providing an output signal having an amplitude and a phase to a corresponding one of said transducers, each of said channel driving systems including at least one of a power measurement system and a phase detector for providing measured values of a respective one of said amplitude and said phase of said output signal, each of said channel driving systems adjusting said corresponding output signal based on a pre-selected value of said output signal and the measured value of said output signal to selectively vaporize said body tissue.
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Accused Products
Abstract
A method and apparatus for performing transmyocardial revascularization using ultrasound is disclosed. The apparatus includes a phased array ultrasonic device that includes a plurality of ultrasonic transducer elements which are controlled using a feedback control system so that each ultrasonic transducer element produces an ultrasonic wave of particular power and phase in order to achieve constructive interference at a desired acoustic focus. The constructive interference creates high pressure amplitudes for vaporizing the target tissue at the focus. A method is provided for vaporizing target tissue for which a plurality of ultrasonic transducers are focused so as to provide constructive interference within the target tissue. The ultrasonic beams are launched and produce a rapid rise in tissue temperature that will vaporize the target tissue within the focal zone.
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Citations
18 Claims
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1. An ultrasonic system for selectively and non-invasively vaporizing body tissue, the system comprising:
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an extracorporeal array of ultrasonic transducers, each of said transducers being capable of producing an ultrasonic wave; and
a plurality of channel driving systems, each of said channel driving systems being coupled to one of said transducers and providing an output signal having an amplitude and a phase to a corresponding one of said transducers, each of said channel driving systems including at least one of a power measurement system and a phase detector for providing measured values of a respective one of said amplitude and said phase of said output signal, each of said channel driving systems adjusting said corresponding output signal based on a pre-selected value of said output signal and the measured value of said output signal to selectively vaporize said body tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An ultrasonic system for selectively and non-invasively vaporizing body tissue, the system comprising:
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an extracorporeal array of ultrasonic transducer elements, each of said transducer elements being capable of producing an ultrasonic wave;
a plurality of channel driving systems, each of said channel driving systems being coupled to one of said transducer elements and providing an output signal having an amplitude and a phase to said one of said transducer elements; and
a control system operatively coupled to each of said channel driving systems, said control system providing a selected value of said phase of said output signal of each of said channel driving systems;
each of said channel driving systems including a phase detector for providing measured value of said phase of said corresponding output signal or of said phase of said corresponding ultrasonic wave, each of said channel driving systems adjusting said corresponding output signal based on said selected value of said phase of said output signal and the measured value of said phase of said output signal or said ultrasonic wave to selectively vaporize said body tissue. - View Dependent Claims (12)
wherein said control system provides a selected value of the amplitude of said output signal of each of said channel driving systems, each of said channel driving systems adjusting said corresponding output signal based on said selected value of the amplitude of said output signal and the measured value of the amplitude of said output signal.
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13. A method of selectively and non-invasively vaporizing human tissue, the method comprising the steps of:
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providing an ultrasonic system comprising an extracorporeal array of channel driver and ultrasonic transducer pairs for producing an array of ultrasonic waves, launching the array of ultrasonic waves at a target tissue site within the body, and focusing the ultrasonic waves at the target site by producing constructive interference of the ultrasonic waves at the target site, said focusing resulting in vaporization of tissue at the target site, said focusing including measuring a value of at least one of signal amplitude and phase transmitted to the array of ultrasonic transducers, and adjusting at least one of the amplitude and the phase transmitted to the array of ultrasonic transducers based on the measured value and a corresponding pre-selected value. - View Dependent Claims (14, 15, 16)
measuring the value of the signal amplitude and the phase transmitted to the array of ultrasonic transducers, and adjusting the amplitude and the phase transmitted to the array of ultrasonic transducers based on the measured value and a corresponding pre-selected value of the amplitude or phase. -
15. The method of claim 13, wherein said step of focusing comprises
measuring a value of at least one of signal amplitude and phase trasmitted to each of the ultrasonic transducers, and adjusting at least one of the amplitude and the phase transmitted to each of the ultrasonic transducers based on the measured value and a corresponding preselected value. -
16. The method of claim 13, further comprising the steps of selecting values of signal power and of phase for the array of ultrasonic transducers and transmitting the values to the array of ultrasonic transducers.
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17. A method of selectively and non-invasively vaporizing human tissue, the method comprising the steps of:
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providing an ultrasonic system comprising an extracorporeal array of channel driver and ultrasonic transducer pairs for producing an array of ultrasonic waves, launching the array of ultrasonic waves at a target tissue site within the body, and focusing the ultrasonic waves at the target site by producing constructive interference of the ultrasonic waves at the target site, said focusing resulting in vaporization of tissue at the target site, said focusing including measuring a value of signal phase transmitted to the array of ultrasonic transducers or a value of the phase of the ultrasonic waves, and adjusting signal phase transmitted to the array of ultrasonic transducers based on one of the measured values and a corresponding pre-selected value. - View Dependent Claims (18)
measuring the value of the signal amplitude transmitted to the array of ultrasonic transducers, and adjusting the amplitude transmitted to the array of ultrasonic transducers based on the measured value of the signal amplitude and a corresponding pre-selected value of the signal amplitude.
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Specification