JP4147064B2 - Ultrasonic treatment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ultrasonic treatment apparatus for crushing stones in the body.
[0002]
[Prior art]
An ultrasonic stone crushing device crushes stones at the tip of a lithotripsy probe that vibrates longitudinally at an ultrasonic frequency. Increasing the amplitude of the probe tip improves the lithotripsy ability, but if the amplitude is too large, the tissue may be damaged when it comes into contact with the living tissue.
[0003]
In order to vibrate the crushed stone probe, a high-frequency current is supplied to the vibrator to which the probe is connected to convert it into mechanical vibration. There are magnetostrictive or electrostrictive vibrators, and bolt-tightened Langevin vibrators are often used as electrostrictive vibrators.
[0004]
The ultrasonic lithotripsy device has a frequency tracking control unit that controls the frequency of the high-frequency current supplied to the ultrasonic transducer, and a constant current control unit that controls the current value of the high-frequency current, and the lithotripsy probe Vibrate at the set amplitude at the resonance frequency.
[0005]
FIG. 6 and FIG. 7 show the current setting signal SI at the time of crushed stone and the high frequency current I1 whose amplitude is controlled by the current setting signal SI and is supplied to the ultrasonic transducer.
[0006]
The tip amplitude of the lithotripsy probe is proportional to the high-frequency current I1.
[0007]
There are a case where driving is performed with a constant amplitude set as shown in FIG. 6 and a case where amplitude modulation is performed for the purpose of reducing heat generation and clogging as shown in FIG. In any case, the maximum amplitude is set to such a size that the calculus can be crushed but the tissue is not damaged such as perforation in order to prevent damage when the tip of the lithotripsy probe contacts the living tissue.
[0008]
In the ultrasonic lithotripsy device and the ultrasonic surgical device, amplitude modulation is performed for the purpose of suppressing heat generation, preventing clogging at the time of crushed stone, and increasing the selectivity at the time of crushing the tissue, for example, DE342984, Japanese Patent No. 2811123. This is known as disclosed in Japanese Patent Publication No. 07-106208.
[0009]
Moreover, in the electrosurgical apparatus, as shown in Japanese Patent Laid-Open Nos. 05-293120 and 10-118094, in order to improve the hemostatic performance by supplying high-frequency power within a short time in the coagulation output, It is known to use an attenuation waveform.
[0010]
[Problems to be solved by the invention]
In the prior art, the vibration of the probe that determines the lithotripsy ability is controlled to a constant or modulated amplitude, and is determined only by the setting at that time regardless of the time from the start of oscillation.
[0011]
When crushing a lithotripte probe that vibrates ultrasonically in contact with a calculus, there is a possibility that the probe tip may come into contact with the living body in a state in which the probe tip vibrates. It was necessary to limit the maximum amplitude of the probe. Therefore, even when the lithotripsy is insufficient, the amplitude cannot be increased sufficiently, and as a result, there is a limit to the lithotripsy ability, and hard calculus may not be crushed.
[0012]
The present invention has been made in view of the above circumstances, and provides an ultrasonic treatment device capable of increasing the amplitude of a probe and improving the lithotripsy ability while avoiding damage to a living tissue under endoscopic observation. The purpose is to do.
[0013]
[Means for Solving the Problems]
The ultrasonic treatment apparatus according to the present invention includes an ultrasonic vibrator capable of generating ultrasonic vibration, a drive signal generating means for generating a drive signal for driving the ultrasonic vibrator, and generated by the drive signal generating means. Amplifying means capable of amplifying the generated driving signal; and a current value input terminal for inputting a target current value of the driving signal supplied from the amplifying means to the ultrasonic transducer. An amplification control means for controlling the amplification means based on the inputted target current value, an operation means capable of operating the operation start of the drive signal generation means, and the amplification control means based on an operation signal from the operation means And a target current control means for outputting a first target current value to the current value input terminal for a predetermined time and outputting a second target current value lower than the first target current value after the predetermined time has elapsed. The predetermined time Said second target current value after excessive, the current value of only the first range not exceeding the target current value is controlled, the first target current value is a current value subjected to stone lithotripsy, wherein the The target current value of 2 is a current value that does not damage the living tissue .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0015]
1 to 5 relate to one embodiment of the present invention, FIG. 1 is a block diagram showing the configuration of the ultrasonic treatment apparatus, FIG. 2 is a block diagram showing the configuration of the high-frequency power source of FIG. 1, and FIG. FIG. 4 is a waveform diagram showing a first modification of the driving current waveform of the ultrasonic transducer driven by the high frequency power source of FIG. 2, and FIG. It is a wave form diagram which shows the 1st modification of the drive current waveform of the ultrasonic transducer | vibrator by this high frequency power supply.
[0016]
As shown in FIG. 1, the entire configuration of the ultrasonic treatment apparatus according to the present embodiment includes an ultrasonic lithotripter main body 1, a handpiece 2, and a foot switch 3, and the ultrasonic lithotripter main body 1 includes a handpiece 2. A high-frequency power source 5 for supplying a drive signal to the ultrasonic transducer 4 provided in the tube, a roller pump 7 for sucking perfusate and crushed stones from a tube 6 connected to the handpiece 2, and a roller pump The driving unit 8 includes a control unit 9 that controls the high-frequency power source 5 and the roller pump 7 in accordance with a signal from the foot switch 3.
[0017]
The handpiece 2 includes the ultrasonic transducer 4 that converts the drive signal supplied from the high-frequency power source 5 into mechanical vibration, and a hollow or solid crushed stone probe 10 that is connected to the ultrasonic transducer 4. Become. The lithotripsy probe 10 is inserted into the patient's body via an endoscope channel, and crushes the calculus at the ultrasonically vibrating tip, and in the case of a hollow probe, sucks the crushed calculus and perfusate. To do.
[0018]
Oscillation and suction are controlled by a foot switch 3 connected to the ultrasonic lithotripter body 1.
[0019]
As shown in FIG. 2, the high-frequency power source 5 includes a frequency tracking control unit 11 that controls the frequency of the high-frequency current supplied to the ultrasonic transducer 4 and a current value setting signal input from the control unit 9. The constant current control unit 12 that controls the current value of the high-frequency current, the amplification unit 13 that amplifies the output of the constant current control unit, and the detection unit 14 that detects the current and voltage output from the amplification unit 13. The crushed stone probe 10 is vibrated with an amplitude set at a resonance frequency.
[0020]
When starting oscillation, the control unit 9 receives a signal from the foot switch 3 and inputs a signal having a frequency near the resonance point from the reference signal source 15. When the start of oscillation is detected, the switch 16 switches to a signal from the detection unit 14, and the frequency tracking unit 11 compares the voltage and current phase signals θv and θI detected by the detection unit 14 to track the resonance frequency. Take control. Further, the constant current control unit 12 compares the current value setting signal input from the control unit 9 with the current value signal | I | detected by the detection unit 14 so that the output current value becomes a set value. To control.
[0021]
Next, FIG. 3 shows a drive current waveform of the ultrasonic transducer 4 in the present embodiment.
[0022]
The amplitude of the output current I is controlled by the current value setting signal SI output from the controller 9. The amplitude of the vibrator 4 and the tip amplitude of the crushed stone probe 10 driven thereby are proportional to the output current I. The user instructs the start of output by the foot switch 3, and the control unit 9 receiving the signal of the foot switch 3 instructs the start of oscillation.
[0023]
In the present embodiment, driving is performed at a predetermined current value I2 for a predetermined time ts after the start of output. After the lapse of the predetermined time ts, the current value setting signal SI output from the control unit 9 is set so that the maximum value of the output current is equal to or less than the predetermined current value I1 lower than the current value I2. .
[0024]
Note that the output current after the predetermined time ts has elapsed, as shown in FIG. 3, in the case of a current output with a constant current value, as well as reducing energy while maintaining the lithotripsy force, reducing heat generation, and crushed stones As shown in FIGS. 4 and 5, amplitude modulation by a rectangular wave, a sine wave, or the like may be applied for the purpose of preventing clogging when sucking the water.
[0025]
As described above, according to the present embodiment, the ultrasonic calculus breaking device is only in a predetermined time immediately after the start of oscillation, which is surely in contact with a calculus and not in contact with a living tissue under endoscopic observation. By increasing the tip amplitude of the lithotripsy probe and lowering the tip amplitude of the lithotripsy probe below the amplitude that does not cause damage even if it comes into contact with living tissue after the predetermined time has elapsed, ultrasonic waves can be maintained while maintaining safety. It has the effect of improving the lithotripsy capacity of the lithotripter.
[Appendix]
(Additional Item 1) In an ultrasonic calculus breaking device including an oscillating unit that outputs a high-frequency current and a vibrator unit that converts an electrical signal output from the oscillating unit into ultrasonic vibrations.
The oscillating unit applies a driving current having a predetermined first current value to the vibrator unit for a predetermined time after the start of output to vibrate, and a current value of the driving current after the predetermined time passes. Is controlled to be equal to or less than a predetermined second current value smaller than the first current value.
[0026]
(Additional Item 2) In the ultrasonic calculus breaking device according to Additional Item 1,
The ultrasonic calculus breaking device, wherein the output current is amplitude-modulated after a predetermined period of time.
[0027]
The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the scope of the present invention.
[0028]
【The invention's effect】
As described above, according to the present invention, it is possible to increase the amplitude of the probe and improve the lithotripsy ability while avoiding damage to living tissue under endoscopic observation.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an ultrasonic treatment apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram showing a configuration of a high-frequency power source in FIG. 1. FIG. FIG. 4 is a waveform diagram showing a first modification of the drive current waveform of the ultrasonic vibrator by the high-frequency power source shown in FIG. 2. FIG. 5 is a waveform diagram showing the first modification of the drive current waveform of the vibrator. FIG. 6 is a waveform diagram showing a first modification of the driving current waveform of the vibrator. FIG. 6 is a first diagram showing a driving current waveform of the ultrasonic vibrator by a conventional high-frequency power source. FIG. Fig. 2 shows the drive current waveform of the vibrator.
DESCRIPTION OF SYMBOLS 1 ... Ultrasonic lithotripter main body 2 ... Handpiece 3 ... Foot switch 4 ... Ultrasonic vibrator 5 ... High frequency power supply 6 ... Tube 7 ... Roller pump 8 ... Roller pump drive part 9 ... Control part 10 ... Crushed stone probe 11 ... Frequency Tracking control unit 12 ... constant current control unit 13 ... amplification unit 14 ... detection unit 15 ... reference signal source 16 ... switch

Claims (1)

An ultrasonic transducer capable of generating ultrasonic vibration;
Drive signal generating means for generating a drive signal for driving the ultrasonic transducer;
Amplifying means capable of amplifying the drive signal generated by the drive signal generating means;
A current value input terminal for inputting a target current value of the drive signal supplied from the amplification means to the ultrasonic transducer; and the amplification means based on the target current value input at the current value input terminal. Amplification control means to control;
Operation means operable to start operation of the drive signal generating means;
Based on an operation signal from the operation means, a first target current value is output to the current value input terminal of the amplification control means for a predetermined time, and after the predetermined time has elapsed, the first target current value is lower than the first target current value. Target current control means for outputting a target current value of 2,
The second target current value is controlled only within a range not exceeding the first target current value after the predetermined time has elapsed ,
The ultrasonic treatment apparatus, wherein the first target current value is a current value to be used for lithotripsy, and the second target current value is a current value that does not damage a living tissue .

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