Ultrasonic calculus treatment apparatus
An ultrasonic calculus treatment apparatus includes a longitudinal-vibration piezoelectric oscillator for vibrating in the axial direction of an ultrasonic transmitting member and a torsional-vibration piezoelectric oscillator for vibrating about the axial direction, and further includes driving circuits for driving the piezoelectric oscillators at respective resonance frequencies and a mode selection switch for permitting the oscillators to vibrate independently or in combination, so that lithotripsy can be performed effectively in accordance with the size of a calculus or a function of an operating tool.
1. An ultrasonic calculus treatment apparatus for performing treatment using ultrasonic vibration, comprising:
an ultrasonic transducer section including a plurality of ultrasonic transducers that longitudinally vibrate in the direction of an axis and torsionally vibrate in a torsional direction with respect to the axis, respectively, to treat biological tissue;
a first oscillator for generating a driving signal to drive at least one of the plurality of ultrasonic transducers in the ultrasonic transducer section, wherein the first oscillator is adapted to generate, as the driving signal, a first driving signal and a second driving signal for driving the plurality of ultrasonic transducers, respectively;
a phase information detection circuit for detecting phase information of the driving signal supplied from the first oscillator to the at least one of the ultrasonic transducers in the ultrasonic transducer section;
a PLL control circuit for controlling an oscillation frequency of the first oscillator so as to be equivalent to a resonance frequency of at least one of the plurality of ultrasonic transducers on the basis of a result of the detection by the phase information detection circuit;
a second oscillator for generating a sweep signal swept in a predetermined frequency range including the resonance frequency;
a switching circuit for selecting the sweep signal supplied from the second oscillator or a detection signal supplied from the phase information detection circuit and then outputting the selected signal to the PLL control circuit; and
a control section adapted to separately control the longitudinal vibration and the torsional vibration.
2. The apparatus according to claim 1 , wherein the second oscillator comprises a digital circuit.
3. The apparatus according to claim 1 , wherein the control section comprises a selection switch adapted to select a combination of the longitudinal vibration and the torsional vibration.
4. The apparatus according to claim 3 , wherein the selection switch is adapted to select a mode of only the longitudinal vibration, a mode of only the torsional vibration, and a mode of the combination of the longitudinal vibration and the torsional vibration.
5. The apparatus according to claim 3 , wherein the selection switch is adapted to change a period of the longitudinal vibration and a period of the torsional vibration.
6. The apparatus according to claim 1 , wherein the control circuit comprises an output setting circuit adapted to control the first oscillator to allow changing an amplitude of the longitudinal vibration and an amplitude of the torsional vibration.