JP2001258089A - Ultrasound driver and ultrasound surgical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrasound driver, that can simply and surely drive an ultrasonic wave vibrator with a desired frequency through digital signal processing. SOLUTION: The ultrasonic wave driver 1 is provided with a digital oscillation circuit 3, that drives an ultrasonic wave vibrator 2 at its resonance point, an AMP 5 that amplifies a drive signal from the digital oscillation circuit 3, a detection circuit 5 that detects a voltage signal phase θv and a current signal phase θi from a drive signal which is supplied to the ultrasonic wave vibrator 2 via the AMP 4, a phase difference detecting circuit 6 that detects a phase difference between the voltage signal phase θv and the current signal phase θi, a register 7 that stores and changes digital frequency data deciding the oscillated frequency of the digital oscillation circuit 3, a data transmission circuit 8 that gives digital frequency data to the register 7 a switching circuit 9, that is provided between the phase difference detection circuit 6 and the register 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic driving apparatus and an ultrasonic operating apparatus, and more particularly, to an ultrasonic driving apparatus and an ultrasonic operating apparatus having a characteristic of a tracking control section driven by a resonance frequency of an ultrasonic vibrator. .

[0002]

2. Description of the Related Art Generally, it is desirable to drive an ultrasonic vibrator used in a surgical ultrasonic scalpel or an ultrasonic suction device at or near its fundamental resonance frequency. With respect to such a technique, for example, a phase lock loop (PLL) system that compares the phases of a drive voltage and a current to an ultrasonic vibrator and controls the drive frequency of the ultrasonic vibrator to match the resonance frequency is used. A driving device is known as a known technology.

That is, this type of ultrasonic transducer can be represented as an equivalent circuit as shown in FIG. 9 in the vicinity of its fundamental resonance point. As shown in this figure, in order to cancel the braking capacity Cd of the ultrasonic transducer, L × C = L
A coil Ld of d × Cd is connected to the ultrasonic transducer in parallel or in series. At this time, the characteristics of the ultrasonic vibrator are represented by a resonance frequency fr = 1 / 2π√ (L × C) (= 1 /
2π (L × C) ^1/2 ), it becomes only a pure resistance component R,
The phase difference between the voltage and the current becomes zero. FIG. 10 shows the impedance Z characteristic of the ultrasonic transducer centered on the frequency fr.
Shown in

However, the voltage phase θ
By controlling the drive frequency to increase or decrease so that the phase difference when comparing v with the current phase θi goes to zero, the device follows the resonance point fr. FIG. 11 shows this state.

Here, it is necessary to ensure that the frequency at the time of starting is between f1 and f2, which is the range in which the resonance point can be tracked. Japanese Patent Publication No. 2691011 discloses a technique in which the frequency at the time of starting is improved to be within the above range.

FIG. 12 illustrates this prior art.
An ultrasonic oscillator 101 having a resonance frequency of fr, a PLL circuit 102 for tracking a resonance point based on the voltage phase and the current phase of the ultrasonic oscillator 101, and power amplification of a frequency signal of the PLL circuit 102 Amplifier circuit (AMP) 10 for generating drive power for driving ultrasonic transducer 101
3, a detection circuit 10 for detecting the voltage signal and the current signal
4 and an oscillation circuit 10 for generating a reference frequency signal at startup
5, a switch for switching one input of the PLL circuit 102 between a current signal and a reference signal, and 106.
At startup, the reference frequency (= fre
Since f) is input to the PLL circuit 102, a voltage signal locked to this frequency is applied to the ultrasonic transducer 101. After that, the switch 106 is switched to set the PLL circuit 1
The resonance point tracking operation is performed by setting the input of 02 as a current signal.

The reference frequency generated by the oscillation circuit 105 is f
Since the drive frequency always exists within the range that can be tracked when the switch 106 is switched by adjusting between 1 and f2, the resonance point tracking operation can be reliably started.

Further, in a surgical system such as an ultrasonic scalpel, probes of various shapes are connected to an ultrasonic vibrator so that the ultrasonic vibrator can be properly used depending on the application. In some cases, a plurality of types of ultrasonic transducers having different frequencies can be used by one driving device. In this case, the respective handpieces in which the transducer and the probe are combined have different resonance frequencies, and as a result, the resonance point tracking range f
1 to f2 also differ. Accordingly, Japanese Patent Publication No. 2674713 discloses a technique in which the frequency at the time of startup is swept including the resonance point, the resonance point is detected during that time, and the tracking operation is switched from that point to the tracking operation by the PLL.

[0009]

However, in the above-described prior art, since the circuit for generating the frequency signal at the time of starting and the PLL circuit are of the analog type,
It was very difficult to suppress the effects of variations and to make individual adjustments. Further, when a probe or an ultrasonic vibrator is added, if those frequencies are new, there is a problem that the frequency setting circuit inside the driving device needs to be readjusted.

To compensate for the drawbacks of the analog method, digital resonance point tracking circuits based on some CPU control methods have been proposed. However, since the tracking operation relies on software calculations. However, there is a disadvantage that the control is slow, and there is a problem that if a high-speed CPU is used to solve the problem, the apparatus itself becomes an expensive system.

Further, when applied to an ultrasonic surgical apparatus, a response at the time of starting oscillation is important, and it is necessary to speed up the response.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an ultrasonic driving apparatus and an ultrasonic operating apparatus which can easily and reliably drive an ultrasonic transducer at a desired frequency by digital signal processing. It is intended to provide.

[0013]

An ultrasonic driving apparatus according to the present invention has a frequency input section for inputting digital frequency data and oscillates an ultrasonic driving signal for driving an ultrasonic vibrator based on the digital frequency data. Generating an ultrasonic drive signal oscillating means and generating frequency variable data for controlling an oscillation frequency of the ultrasonic drive signal oscillating means based on the ultrasonic drive signal supplied to the ultrasonic vibrator from the ultrasonic drive signal oscillating means And frequency calculating means for adding or subtracting the variable frequency data to or from predetermined frequency initial data to calculate the digital frequency data.

An ultrasonic surgical apparatus according to the present invention comprises a plurality of types of handpieces each having a built-in ultrasonic transducer, and an ultrasonic drive device for ultrasonically driving at least one of the plurality of types of handpieces. In an ultrasonic surgical apparatus for treating a living tissue with an ultrasonic wave, the plurality of types of handpieces include information storage means having pre-attached information, and the ultrasonic driving apparatus includes a frequency input for inputting digital frequency data. An ultrasonic drive signal oscillating means for oscillating an ultrasonic drive signal for driving an ultrasonic vibrator based on the digital frequency data, and supplied to the ultrasonic vibrator by the ultrasonic drive signal oscillating means. Frequency control means for generating variable frequency data for controlling the oscillation frequency of the ultrasonic drive signal oscillating means based on the ultrasonic drive signal, Calculating means for calculating the digital frequency data by adding or subtracting the frequency variable data to the data, reading means for reading the information in the information storage means, and reading the information in the information storage means read by the reading means. And transmitting means for transmitting the frequency initial data to the arithmetic means.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

First Embodiment FIGS. 1 and 2 relate to a first embodiment of the present invention. FIG. 1 is a block diagram showing a configuration of an ultrasonic driving device, and FIG. 5 is a flowchart illustrating an operation of the driving device.

(Construction) Ultrasonic drive 1 of the present embodiment
As shown in FIG. 1, a digital oscillation circuit 3 composed of, for example, a direct digital synthesizer by a digital circuit system for generating a drive signal for driving the ultrasonic transducer 2 at a resonance point, and a drive from the digital oscillation circuit 3 An amplifier circuit (AMP) 4 for amplifying a signal, and a detection circuit 5 for detecting a voltage signal phase θv and a current signal phase θi as feedback signals from a drive signal supplied to the ultrasonic transducer 2 via the amplifier circuit 4. And a phase difference detection circuit 6 for detecting a phase difference between a voltage signal phase θv and a current signal phase θi, which are feedback signals from the detection circuit 5.
A register 7 for holding digital frequency data for determining the oscillation frequency of the digital oscillation circuit 3 and changing the digital frequency data by an external signal;
A data transmission circuit 8 for transmitting digital frequency data indicating the resonance frequency fr of the ultrasonic transducer 2 or a frequency in the vicinity thereof to the register 7, and the data transmission circuit 8 is provided between the phase difference detection circuit 6 and the register 7. It comprises a switch circuit 9 and a control circuit 10 for controlling the operations of the switch circuit 9 and the data transmission circuit 8.

Here, the ultrasonic transducer 2 can be used for a handpiece in an ultrasonic surgical system.

(Operation) In such a configuration, the control circuit 10 performs processing as shown in FIG. That is, in step S1, when the oscillation is started, the digital frequency data of the data transmission circuit 8 is transmitted to the register 7 while the switch circuit 9 is kept in the cut-off state, and in step S2, the oscillation frequency of the digital oscillation circuit 3 is increased. The resonance frequency fr is made to substantially coincide with the resonance frequency fr.

The ultrasonic resonator 2 has its fundamental resonance frequency f
Since a drive signal of r or a frequency close to r is supplied, the detection circuit 5 detects an output very close to a feedback signal obtained when the ultrasonic transducer 2 is driven at the basic resonance point, that is, a current phase signal and a voltage phase signal. You.

Here, the feedback signal will be described with reference to FIGS. FIG. 9 shows a general electric equivalent circuit when an ultrasonic transducer and a coil for matching are connected in parallel to the ultrasonic transducer. Generally, the resonance frequency fr of an ultrasonic transducer is fr = 1 / 2π√ (L ×
C) (= １ ／ π (L × C) ^1/2 ).

In order to drive the ultrasonic vibrator efficiently, the coil Ld is connected in series or in parallel. The coil Ld is set to resonate with the braking capacity Cd of the ultrasonic transducer. That is, fr = 1 / 2π√ (Ld × C
d) is set. FIG. 10 shows the impedance characteristics at this time, and the frequencies f1 and f2 are anti-resonance points. At the basic resonance point fr, the magnitude of the impedance becomes the minimum value R, and the phase difference between the voltage and the current becomes zero. At this point, all electrical energy supplied to the ultrasonic transducer is consumed by the resistance component R, that is, converted into vibration energy.

FIG. 11 shows the phase relationship between the voltage and the current before and after the resonance point. As can be seen, the frequency f
When the drive frequency is low around r, the current phase is delayed, and when the drive frequency is high, the current phase is advanced. Therefore, by adjusting the drive frequency based on the phase difference between the voltage phase and the current phase, even when the resonance frequency fr of the ultrasonic vibrator fluctuates due to a load change or a temperature change, it follows between the frequencies f1 and f2. Thus, tracking control that always drives at the resonance frequency can be performed.

After maintaining the state in which these feedback signals can be obtained by the detection circuit 5, that is, after starting the ultrasonic vibrator 2, returning to FIG. 2, the control circuit 10 turns on the switch circuit 9 in step S3. Become. Then, based on the phase difference between the voltage phase signal θv and the current phase signal θi input to the phase difference detection circuit 6 in step S4, the feedback signal (U / D) for raising or lowering the digital frequency data held in the register 7 ) Is input to the register 7 to change the frequency of the digital oscillation circuit 3, and the PLL operation is performed digitally.

(Effect) As described above, in the ultrasonic driving apparatus 1 of the present embodiment, at the time of startup, the digital oscillation circuit 3 is oscillated by the digital frequency data indicating the resonance frequency fr of the ultrasonic transducer 2 or a frequency in the vicinity thereof. Then, a feedback signal (U / U) based on the phase difference between the voltage phase signal θv and the current phase signal θi input to the phase difference detection circuit 6
D) raises or lowers the digital frequency data held in the register 7 to vary the oscillation frequency of the digital oscillation circuit 3, so that the drive signal given to the ultrasonic vibrator 2 is adjusted to ensure resonance. The ultrasonic vibrator 2 can be driven at the frequency fr.

If the frequency data sent from the data sending circuit 8 is equal to or smaller than f1 or equal to or larger than f2, the resonance point fr by the frequency adjusting mechanism composed of the above-described constituent means based on the feedback signal obtained at the time of starting.
Tracking control becomes impossible from the beginning. In that case, the frequency data sent out from the data sending circuit 8 is again fr
After the frequency is set to the vicinity, the signal is sent to the register 7 and the frequency of the drive signal generated by the digital oscillation circuit 3 is set to the vicinity of fr, so that the resonance point tracking operation is performed again.

Second Embodiment FIG. 3 is a block diagram showing a configuration of an ultrasonic driving device according to a second embodiment of the present invention.

Since the second embodiment is almost the same as the first embodiment, only different points will be described, and the same components will be denoted by the same reference numerals and description thereof will be omitted.

(Construction) In the second embodiment, various ultrasonic transducers 2a having different resonance frequencies fr are used.
It is configured so that digital frequency data corresponding to each resonance frequency fr of 2b and 2c can be obtained.

That is, as shown in FIG. 3, various ultrasonic transducers 2a, 2b, 2c are provided with plugs 21a, 21b, 21c for selectively connecting to the ultrasonic driving device 1, and these plugs are provided. Identification units (ID) 22a, 22 for identifying ultrasonic transducers are provided inside 21a, 21b, 21c.
b, 22c are provided.

On the other hand, the ultrasonic drive 1 has a plug 21
a, a connector 21 to which a, 21b, and 21c can be connected; and a recognition circuit 24 that recognizes the identification units (ID) 22a, 22b, and 22c and determines the connected ultrasonic transducers 2a, 2b, and 2c. , The data transmission circuit 8 is a recognition circuit 24
The digital frequency data indicating the pre-stored resonance frequency fr of the ultrasonic transducers 2a, 2b, 2c or a frequency in the vicinity thereof is selectively transmitted to the register 7 based on the determination result by .

(Operation) In the present embodiment, the digital oscillation circuit 3 is oscillated by digital frequency data indicating the resonance frequency fr corresponding to the ultrasonic transducers 2a, 2b, 2c connected at the time of starting or a frequency in the vicinity thereof. .

Here, the ultrasonic vibrators 2a, 2b, 2
c can be used for a plurality of types of handpieces depending on the application in the ultrasonic surgical system.

(Effects) As described above, according to the present embodiment, in addition to the effects of the first embodiment, the ultrasonic vibrator 2
If the resonance frequency fr differs depending on the type of the a, 2b, and 2c, the data transmission circuit 8 has digital frequency data corresponding to the ultrasonic vibrator in advance, and the recognition circuit 2
By selectively transmitting the result to the register 7 and using the result of 4 to start, the resonance point tracking control can be reliably performed by each ultrasonic transducer.

Third Embodiment: FIG. 4 is a block diagram showing a configuration of an ultrasonic drive device according to a third embodiment of the present invention.

Since the third embodiment is almost the same as the second embodiment, only different points will be described, and the same components will be denoted by the same reference numerals and description thereof will be omitted.

(Construction) In the third embodiment, frequency data corresponding to the resonance frequency fr of the various ultrasonic transducers 2a, 2b, 2c is directly obtained from each ultrasonic transducer. ing.

That is, as shown in FIG. 4, various ultrasonic transducers 2a, 2b, and 2c have resonance frequencies of the ultrasonic transducers inside plugs 21a, 21b, and 21c for selectively connecting to the apparatus. Data holding units (DATA) 31a, 31b holding digital frequency data indicating the values of
31c is provided. Then, in the ultrasonic driving apparatus 1, the data sending circuit 8 includes the data holding unit (DATA) 31.
The digital frequency data a, 31b, and 31c are read out, and the frequency data is transmitted to the register 7.

(Operation) When the resonance frequency fr differs depending on the type of the ultrasonic transducers 2a, 2b, and 2c, each ultrasonic transducer has digital frequency data corresponding to the ultrasonic transducer, and the digital frequency The data is transferred to the data sending circuit 8 and held, and sent to the register 7 to be activated.

(Effect) As described above, in the present embodiment, the second
The same effect as that of the embodiment can be obtained.

Fourth Embodiment: FIGS. 5 to 7 relate to a fourth embodiment of the present invention, FIG. 5 is a block diagram showing a configuration of an ultrasonic driving device, and FIG. FIG. 7 is a flowchart illustrating the operation of the driving device, and FIG. 7 is an explanatory diagram illustrating a frequency sweeping operation in the process of FIG.

Since the fourth embodiment is almost the same as the first embodiment, only different points will be described, and the same components will be denoted by the same reference numerals and description thereof will be omitted.

(Structure) In the fourth embodiment, as shown in FIG. 5, a handpiece 41, which is a treatment instrument for performing an operation in an ultrasonic operation system, includes an ultrasonic vibrator 2,
The probe 42 is used by being fastened to the ultrasonic transducer 2 with a screw structure, and a plurality of types of the probes 42 can be selectively used depending on the application. For example, there are a general straight type probe 42a and a general bent type probe 42b, and when the respective probes 42 are fastened to the ultrasonic vibrator 2, the resonance frequency of the handpiece 41 at that time is different.

The ultrasonic driving apparatus 1 according to the present embodiment includes a resonance point detecting circuit 51 for detecting a resonance point of the handpiece 41.
And a pulse generating circuit 52 for transmitting a signal to the register 7 to generate a signal for proportionally increasing or decreasing the digital frequency data held by the register 7 at an arbitrary ratio.
A switch 53 for selectively switching the output of the phase difference detection circuit 6 or the output of the pulse generation circuit 52 based on the detection result of the resonance point detection circuit 51 and supplying the output to the register 7;
The data transmission circuit 54 transmits frequency data higher or lower than the resonance frequency of the handpiece 41 by a certain amount to the register 7, and the control circuit 55 controls the operation of the pulse generation circuit 52 and the data transmission circuit 54. It is configured.

(Operation) The operation of the present embodiment having the above configuration will be described with reference to FIG. First, at the time of activation, in step S11, the handpiece 41 is transmitted from the data transmission circuit 54.
The frequency data fr + Δf which is higher than the frequency fr near the resonance frequency by a certain frequency Δf
To send to. Then, in step S12, the oscillation circuit 3 generates a drive signal having the frequency indicated by the data from the register 7 and supplies the drive signal to the ultrasonic transducer 2 via the amplifier circuit 4.

Here, as shown in FIG.
The resonance frequency of the handpiece when the 2a is fastened to the ultrasonic transducer 2 is fr1, the resonance frequency when the probe 42b is fastened to the ultrasonic transducer 2 is fr2, and fr
Assuming that + Δf>f2> f1, FIG.
The frequency at the "start" point shown in FIG.

In this state, the switch 53 is selected so as to supply the output of the pulse generation circuit 52 to the register 7, and the feedback signal from the detection circuit 5 is not input to the register 7. Is not performed.

Returning to FIG. 6, next, in step S13, a pulse signal is generated from the pulse
The digital frequency data inside is gradually reduced. For example, one rising pulse reduces the frequency data in the register by 1 Hz. If 1,000 pulses are transmitted periodically, the frequency data in the register is smoothly reduced by 1 kHz. Therefore, the frequency of the digital oscillation circuit 3, that is, the frequency supplied to the ultrasonic transducer 2, is swept (swept) at a constant rate of change (see FIG. 7).

As described above, the ultrasonic vibrator 2 is supplied with the frequency signal that changes from the frequency higher than the resonance point to the resonance frequency, and during that time, the step S14 is performed.
Then, the resonance point detection circuit 51 monitors whether or not the frequency supplied based on the detection signal from the detection circuit 5 is the resonance frequency. If the resonance point is not at the resonance point, the sweep operation is continued, and the resonance point is detected. , Switch 5 in step S15
3 is selected to supply the output of the phase difference detection circuit 6 to the register 7.

Then, in step S16, the control signal to the register 7 is switched to the signal from the phase difference detection circuit 6, and thereafter, the feedback signal (U / D) based on the phase difference between the voltage signal phase θv and the current signal phase θi. The control operation for tracking the resonance point by increasing or decreasing the frequency data of the register 7 is started.

(Effects) As described above, according to the present embodiment, in addition to the effects of the first embodiment, even if the resonance frequencies of the probes fastened to the ultrasonic vibrator 2 are different, each probe is different. When the resonance point is found in the middle of the sweep, the switch 53 is switched, and a feedback signal in the range (f1 to f2 in FIG. 11) in which the resonance point can be tracked is obtained, so that the frequency tracking control by the PLL can be surely performed. Become.

FIG. 8 is a block diagram showing a configuration of an ultrasonic operation system according to a fifth embodiment of the present invention.

In the fifth embodiment, the respective configurations of the ultrasonic driving devices of the second embodiment and the fourth embodiment are applied to an ultrasonic operation system. Since this embodiment is almost the same as the fourth embodiment and the fourth embodiment, only different points will be described, and the same components will be denoted by the same reference numerals and description thereof will be omitted.

(Structure and Operation) As shown in FIG. 8, an ultrasonic operation system 61 according to the present embodiment includes a foot switch 62 for turning on and off an output, and an apparatus main body including an ultrasonic drive unit. 63 and a plurality of types of handpieces 64 each having a resonance frequency according to the intended use.

The handpiece 64 can be replaced with a handpiece 64a having a replaceable probe or a handpiece 64b having a bent probe attached thereto, depending on the application.
And a handpiece 64c having a scissor-type probe. Each is provided with a plug 21 so that the plug 21 can be selectively connected to the apparatus main body 63.
a, 21b, and 21c are provided with identification unit identification units (ID) 22a, 22 for identifying respective handpieces.
b, 22c (hereinafter, the reference numeral is 22) are provided.

The apparatus main body 63 recognizes the connector 23 for attaching the plug 22 of the handpiece 64 and the identification portion 22 provided in each plug 21 to determine which handpiece 64 is connected to the connector 23. A recognition circuit 24 for recognizing the data, a data transmission circuit 8 for selecting digital frequency data held in advance based on the result of the determination by the recognition circuit 24 and transmitting the digital frequency data to the register 7, and a digital frequency data from the data transmission circuit 8 One sub-register 66, register 7 and sub-register 6
And a comparison circuit 67 for comparing the data of No. 6 and the handpiece 64 connected to the connector 23 by the recognition circuit 24 from a plurality of types of handpieces as described in the second embodiment. Data transmission circuit 8 based on
The digital frequency data is transmitted to the register 7 from
The drive signal of that frequency is supplied to the ultrasonic vibrator of the handpiece 64.

At this time, the digital frequency data output from the data transmission circuit 8 is, as described in the fourth embodiment, a frequency higher than the resonance frequency fr of the handpiece 64 by a certain frequency Δf. Data fr + Δ
f.

Then, similarly to the fourth embodiment, the digital frequency data in the register 7 is sequentially changed by the pulse signal from the pulse generation circuit 52, and the frequency of the digital oscillation circuit 3 is changed. The frequency of the drive signal supplied to the ultrasonic vibrator is scanned. Meanwhile, the resonance point of the handpiece 64 is monitored by the resonance point detection circuit 51, and when the resonance point is found, the switch 5 is detected.
3, the resonance point tracking control by the PLL operation based on the feedback signal (U / D) from the phase difference detection circuit 6 is performed.

The apparatus main body 63 further receives a signal indicating the magnitude of the current flowing from the detection circuit 5 to the ultrasonic vibrator of the handpiece 64, rectifies the signal, and converts the signal into a DC voltage. A D / A conversion circuit 72 for converting a signal for setting the magnitude of the current flowing from the control circuit 78 to the ultrasonic vibrator of the handpiece 64 into an analog signal, and a conversion circuit 71 and a D / A conversion circuit 72. A differential amplifier 73 for comparing signals; and a multiplying voltage-controlled amplifier 74 for amplifying a frequency signal from the digital oscillator 3 in proportion to the magnitude of the output signal of the differential amplifier 73. ,
That is, the constant current control circuit 75 is configured so that the value of the current flowing through the ultrasonic vibrator of the handpiece 64 is constant.

Further, in addition to the register 7 for holding the digital frequency data of the frequency generated by the digital oscillation circuit 3, the driving device 63 holds the frequency data received from the data transmission circuit 8 as described above. A sub-register 66 is provided, and the digital frequency data of the register 7 having digital frequency data changed every moment by the phase tracking control after startup and the initial digital frequency data held by the sub-register 66 are provided. The comparison circuit 67 performs comparison and monitoring.

The device main body 63 is provided with an indicator 77 composed of an LED bar graph or the like. The magnitude of the voltage or current applied to the ultrasonic transducer is indicated by a bar graph. The driving state of the sonic transducer can be displayed.

The control circuit 78 controls the entire operation of the apparatus main body 63. The control circuit 78 exchanges data with the operation panel 79, sends data to the D / A conversion circuit 72, and sends the data to the ultrasonic vibrator. The value of the flowing current, that is, the magnitude of the amplitude is set. Also, by manually inputting digital frequency data corresponding to each handpiece from the operation panel 79, the control circuit 78 sends the data transmission circuit 8
It is also possible to set the digital frequency data input as an initial value in.

(Effect) As described above, according to the present embodiment, in addition to the effects of the second and fourth embodiments, the oscillation amplitude of the ultrasonic transducer is reduced by the constant current control circuit 75. Utilizing the fact that it is proportional to the magnitude of the flowing current,
By controlling the current value to be constant, it is possible to drive the ultrasonic transducer with a stable amplitude.

Further, the comparison circuit 76 compares and monitors the digital frequency data of the register 7 having the digital frequency data changed every moment, and the initial digital frequency data of the sub-register 66. If the data difference greatly exceeds a predetermined value, it can be determined that some abnormality has occurred, and the result is sent to the digital oscillation circuit 3 to stop oscillation,
By transmitting the signal to the control circuit 78, a warning can be issued on the operation panel 79 or the entire operation can be stopped. By this operation, for example, it is possible to detect a state in which an abnormality occurs in the ultrasonic vibrator or the probe, the resonance point fluctuates extremely, or the resonance point does not exist due to disconnection or destruction.

[Supplementary Note] (Supplementary note 1) The ultrasonic drive device may include a current value detecting means for detecting a current value flowing through the ultrasonic vibrator, and the ultrasonic vibrator so that the current value is constant. 3. The ultrasonic surgical apparatus according to claim 2, further comprising: a constant current control unit configured to control a magnitude of a voltage applied to the ultrasonic surgical apparatus.

(Supplementary Note 2) The ultrasonic driving device includes a holding unit for holding the frequency initial data, and a comparing unit for comparing the digital frequency data with the frequency initial data held by the holding unit. 3. The ultrasonic surgical apparatus according to claim 2, further comprising: controlling the driving of the ultrasonic transducer based on a comparison result of the comparing unit.

(Additional Item 3) Reading means for reading information previously attached to a handpiece provided with the ultrasonic transducer, and based on the information read by the reading means,
2. The ultrasonic driving device according to claim 1, further comprising a transmission unit that transmits the frequency initial data to the calculation unit.

(Additional Item 4) The ultrasonic driving apparatus according to Additional Item 3, wherein the information is individual information corresponding to the ultrasonic transducer.

(Supplementary note 5) The ultrasonic drive device according to claim 1, further comprising a data output means for outputting the frequency initial data to the calculation means.

[0070]

As described above, according to the present invention, there is an effect that the ultrasonic transducer can be easily and reliably driven at a desired frequency by digital signal processing.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an ultrasonic driving device according to a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating the operation of the ultrasonic driving device of FIG. 1;

FIG. 3 is a block diagram showing a configuration of an ultrasonic driving device according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of an ultrasonic driving device according to a third embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of an ultrasonic driving device according to a fourth embodiment of the present invention.

FIG. 6 is a flowchart illustrating the operation of the ultrasonic driving device of FIG. 5;

FIG. 7 shows a frequency sweep (sweep) in the processing of FIG. 6;
Explanatory diagram explaining operation

FIG. 8 is a block diagram showing a configuration of an ultrasonic driving device according to a fifth embodiment of the present invention.

FIG. 9 is a diagram showing a general electric equivalent circuit when an ultrasonic oscillator and a matching coil are connected in parallel to the ultrasonic oscillator.

FIG. 10 is a diagram showing impedance characteristics of the equivalent circuit of FIG. 9;

FIG. 11 is a diagram showing a phase relationship between a voltage and a current before and after a resonance point when the ultrasonic transducer is driven.

FIG. 12 is a block diagram showing a configuration of a conventional ultrasonic driving device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Ultrasonic drive device 2 ... Ultrasonic transducer 3 ... Digital oscillation circuit 4 ... Amplifier circuit (AMP) 5 ... Detection circuit 6 ... Phase difference detection circuit 7 ... Register 8 ... Data transmission circuit 9 ... Switch circuit 10 ... Control circuit

Continuation of the front page F term (reference) 4C060 JJ17 JJ25 5D019 AA08 FF04 5J106 AA03 CC03 CC21 DD05 DD08 DD38 KK39

Claims (2)

[Claims] An ultrasonic drive signal oscillating means for oscillating an ultrasonic drive signal for driving an ultrasonic vibrator based on the digital frequency data, comprising: a frequency input unit for inputting digital frequency data; Frequency control means for generating frequency variable data for controlling the oscillation frequency of the ultrasonic drive signal oscillating means based on the ultrasonic drive signal supplied to the ultrasonic transducer from the drive signal oscillating means; An ultrasonic driving device comprising: an arithmetic unit for calculating the digital frequency data by adding or subtracting the variable frequency data to or from the initial data. 2. A living tissue, comprising: a plurality of types of handpieces each including an ultrasonic vibrator; and an ultrasonic drive device configured to ultrasonically drive at least one of the plurality of types of handpieces. In the ultrasonic surgical apparatus to be treated, the plurality of types of handpieces include information storage means having pre-attached information, and the ultrasonic driving apparatus has a frequency input unit for inputting digital frequency data,
An ultrasonic drive signal oscillating means for oscillating an ultrasonic drive signal for driving an ultrasonic transducer based on the digital frequency data; and the ultrasonic drive supplied to the ultrasonic transducer from the ultrasonic drive signal oscillating means Frequency control means for generating variable frequency data for controlling the oscillation frequency of the ultrasonic drive signal oscillating means based on the signal; and calculating means for calculating the digital frequency data by adding or subtracting the variable frequency data to or from the initial frequency data Reading means for reading the information of the information storage means, and transmission means for transmitting the frequency initial data to the calculation means based on the information of the information storage means read by the reading means. Ultrasonic surgical device characterized.