Ultrasonic cerebral infarction therapeutic apparatus
First Claim
1. An ultrasonic cerebral infarction therapeutic apparatus that dissolves thrombus by irradiating an ultrasonic wave through the cranium to an embolic site of the cerebral blood vessel in the cranium, comprising:
- an ultrasonic irradiation device equipped with one or a plurality of ultrasonic transducers constructed to cover a part or the whole of the head of a patient under therapy;
a high frequency oscillator that supplies a high frequency signal for activating the ultrasonic transducers;
a switching device for selecting one or several ultrasonic transducers that are suitable to irradiate the ultrasonic wave toward the embolic site from among the one or the plurality of ultrasonic transducers; and
a control device for supplying a high frequency signal outputted from the high frequency oscillator to the one or the plurality of ultrasonic transducers selected by the switching device;
wherein the high frequency signal supplied from the high frequency oscillator is selected from one of following waves;
(1) a frequency-modulated continuous sinusoidal wave that does not maintain the same frequency for a time longer than 1 ms,(2) a burst wave such that each one of signals constituting the burst wave has an excitation duration of less than 1 ms,(3) a pulse wave such that each one of pulses constituting the pulse wave has an excitation duration of less than 1 ms, andwherein repetition of said excitation duration period is 1 ms or less.
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Accused Products
Abstract
An ultrasonic cerebral infarction therapeutic apparatus that does not produce side effects of destruction of brain cells, occurrence of intracerebral hemorrhage, destruction of nerve cells, etc. by avoiding formation of a standing wave by interference between an irradiated beam of an ultrasonic wave irradiated to the inside of the cranium and its reflected beam. An ultrasonic probe cap is constructed by arranging a plurality of laminated small transducers each made up of a PVDF film, a PZT ceramic, or the like in a mosaic-like pattern or in other form on the inside of the cap and one or more transducers are selected and activated according to a thrombus position. As a high frequency for actuating a transducer, a continuous sinusoidal wave, a burst wave, or a pulse wave shall be used so that no standing wave may be produced inside the cranium.
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Citations
13 Claims
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1. An ultrasonic cerebral infarction therapeutic apparatus that dissolves thrombus by irradiating an ultrasonic wave through the cranium to an embolic site of the cerebral blood vessel in the cranium, comprising:
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an ultrasonic irradiation device equipped with one or a plurality of ultrasonic transducers constructed to cover a part or the whole of the head of a patient under therapy; a high frequency oscillator that supplies a high frequency signal for activating the ultrasonic transducers; a switching device for selecting one or several ultrasonic transducers that are suitable to irradiate the ultrasonic wave toward the embolic site from among the one or the plurality of ultrasonic transducers; and a control device for supplying a high frequency signal outputted from the high frequency oscillator to the one or the plurality of ultrasonic transducers selected by the switching device; wherein the high frequency signal supplied from the high frequency oscillator is selected from one of following waves; (1) a frequency-modulated continuous sinusoidal wave that does not maintain the same frequency for a time longer than 1 ms, (2) a burst wave such that each one of signals constituting the burst wave has an excitation duration of less than 1 ms, (3) a pulse wave such that each one of pulses constituting the pulse wave has an excitation duration of less than 1 ms, and wherein repetition of said excitation duration period is 1 ms or less. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification