JP3826140B2 - Ultrasonic drive - Google Patents

Description

  The present invention relates to an ultrasonic drive device, and more particularly to an ultrasonic drive device characterized by a tracking control portion in resonance frequency drive of an ultrasonic transducer.

In general, it is desirable that an ultrasonic transducer used in a surgical ultrasonic scalpel or an ultrasonic suction device is driven at or near its fundamental resonance frequency. With regard to such a technique, for example, by a phase lock loop (PLL) system that controls the drive frequency of the ultrasonic transducer to match the resonance frequency by comparing the phase of the drive voltage and current to the ultrasonic transducer. The driving device is known as a known technique.

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

  Thus, the device tracks the resonance point fr by controlling the drive frequency to be increased or decreased so that the phase difference when the voltage phase θv and the current phase θi are compared to zero by the PLL operation. It becomes like this. This is shown in FIG.

  Here, it is necessary to make sure that the frequency at the time of activation 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 improved so that the frequency at startup is in the above range.

  FIG. 12 illustrates this prior art. An ultrasonic transducer 101 having a resonance frequency of fr, a PLL circuit 102 for tracking the resonance point based on the voltage phase and current phase of the ultrasonic transducer 101, and An amplifier circuit (AMP) 103 that generates drive power for driving the ultrasonic transducer 101 by power amplification of the frequency signal of the PLL circuit 102, a detection circuit 104 that detects the voltage signal and the current signal, and activation An oscillation circuit 105 for generating a reference frequency signal for the hour, and a switch 106 for switching one input of the PLL circuit 102 between a current signal and a reference signal, and the reference frequency (= fref from the oscillation circuit 105 at the time of startup. ) Is input to the PLL circuit 102, a voltage signal locked to this frequency is applied to the ultrasonic transducer 101. Thereafter, the switch 106 is switched to make the input of the PLL circuit 102 a current signal, whereby the resonance point tracking operation is performed.

  By adjusting the reference frequency generated by the oscillating circuit 105 between f1 and f2, the drive frequency is always in a range where tracking can be performed when the switch 106 is switched, and therefore, the resonance point tracking operation can be surely started. It can be done.

Furthermore, in a surgical system such as an ultrasonic scalpel, probes of various shapes are connected to an ultrasonic transducer so that they can be used properly according to the application. In some cases, a plurality of types of ultrasonic transducers having different frequencies can be used in one drive device. In this case, each handpiece combining the transducer and the probe has a different resonance frequency, and as a result, the resonance point tracking range f1 to f2 also differs. Japanese Patent Publication No. 2647713 discloses a technique of sweeping the frequency at the time of startup including the resonance point, detecting the resonance point in the meantime, and switching to the tracking operation by the PLL from that point.
Japanese Patent Publication No. 2691011 Japanese Patent No. 2647713

  However, in the above-described prior art, since the circuit for generating the frequency signal at the time of startup and the PLL circuit are analog systems, the influence of variation is suppressed and individual adjustment is very difficult. Further, when a probe or an ultrasonic transducer is added and the frequency thereof is new, there is a problem that it is necessary to readjust the frequency setting circuit inside the driving device.

  To compensate for the shortcomings of the analog method, digital resonance point tracking circuits using several CPU control methods have been proposed so far. There is a disadvantage that it 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.

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

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an ultrasonic drive device that can easily and reliably drive an ultrasonic transducer at a desired frequency by digital signal processing. .

  A first ultrasonic driving device of the present invention is an ultrasonic driving device capable of connecting a plurality of ultrasonic transducers and enabling drive control according to the connected ultrasonic transducers. Based on the frequency data, an ultrasonic drive signal oscillating means for oscillating an ultrasonic drive signal for driving the ultrasonic transducer, and an ultrasonic wave for detecting the ultrasonic drive signal applied to the connected ultrasonic transducer Drive signal detection means, initial frequency data storage means for storing predetermined initial frequency data according to the plurality of ultrasonic vibrators, and ultrasonic transducer recognition for recognizing the type of connected ultrasonic transducer And initial frequency data corresponding to the type of the ultrasonic transducer recognized by the ultrasonic transducer recognition unit is read from the initial frequency data storage unit and the initial frequency data is transmitted. Data transmission means and driving of the ultrasonic drive signal oscillation means at an initial drive frequency corresponding to the initial frequency data sent from the initial frequency data transmission means, and from the ultrasonic drive signal detection means Frequency control means for controlling to vary the oscillation frequency of the ultrasonic drive signal oscillating means based on the detection result.
  A second ultrasonic driving device of the present invention is an ultrasonic driving device capable of connecting a plurality of ultrasonic transducers and enabling drive control according to the connected ultrasonic transducers. Based on the frequency data, an ultrasonic drive signal oscillating means for oscillating an ultrasonic drive signal for driving the ultrasonic transducer, and an ultrasonic wave for detecting the ultrasonic drive signal applied to the connected ultrasonic transducer Drive signal detection means, initial frequency data storage means for storing predetermined initial frequency data according to the plurality of ultrasonic vibrators, and ultrasonic transducer recognition for recognizing the type of connected ultrasonic transducer And initial frequency data corresponding to the type of the ultrasonic transducer recognized by the ultrasonic transducer recognition unit is read from the initial frequency data storage unit and the initial frequency data is transmitted. Data transmission means and driving of the ultrasonic drive signal oscillation means at an initial drive frequency corresponding to the initial frequency data sent from the initial frequency data transmission means, and from the ultrasonic drive signal detection means The frequency control means for controlling the oscillation frequency of the ultrasonic drive signal oscillating means to be varied based on the detection result, and the initial drive frequency is compared with the drive frequency currently driving the ultrasonic transducer, And an abnormality determining means for determining an abnormality of the ultrasonic driving device according to the comparison result.
  A third ultrasonic driving device of the present invention is an ultrasonic driving device capable of connecting a plurality of ultrasonic transducers and enabling drive control according to the connected ultrasonic transducers. Based on the frequency data, an ultrasonic drive signal oscillating means for oscillating an ultrasonic drive signal for driving the ultrasonic transducer, and an ultrasonic wave for detecting the ultrasonic drive signal applied to the connected ultrasonic transducer Drive signal detection means, initial frequency data input means for inputting initial frequency data stored in the plurality of ultrasonic transducers, and initial frequency stored in the ultrasonic transducer input in the initial frequency data input means Initial frequency data transmitting means for transmitting data, and the ultrasonic drive signal oscillation by an initial driving frequency according to the initial frequency data transmitted from the initial frequency data transmitting means And a frequency control means for controlling to vary the oscillation frequency of the ultrasonic drive signal oscillating means based on the detection result from the ultrasonic drive signal detecting means. To do.
  A fourth ultrasonic drive device according to the present invention is an ultrasonic drive device capable of connecting a plurality of ultrasonic transducers and enabling drive control according to the connected ultrasonic transducers. Based on the frequency data, an ultrasonic drive signal oscillating means for oscillating an ultrasonic drive signal for driving the ultrasonic transducer, and an ultrasonic wave for detecting the ultrasonic drive signal applied to the connected ultrasonic transducer Drive signal detection means, initial frequency data input means for inputting initial frequency data stored in the plurality of ultrasonic transducers, and initial frequency stored in the ultrasonic transducer input in the initial frequency data input means Initial frequency data transmitting means for transmitting data, and the ultrasonic drive signal oscillation by an initial driving frequency according to the initial frequency data transmitted from the initial frequency data transmitting means Frequency control means for starting to drive the stage and controlling the oscillation frequency of the ultrasonic drive signal oscillating means to vary based on the detection result from the ultrasonic drive signal detecting means; and the initial drive frequency and the current An abnormality determination unit that compares a drive frequency for driving the ultrasonic transducer and determines an abnormality of the ultrasonic drive device according to the comparison result is provided.

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

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

  1 and 2 relate to the first embodiment of the present invention, FIG. 1 is a block diagram showing the configuration of the ultrasonic drive device, and FIG. 2 is a flowchart for explaining the operation of the ultrasonic drive device of FIG.

(Constitution)
As shown in FIG. 1, the ultrasonic drive device 1 of the present embodiment includes a digital oscillation circuit 3 composed of, for example, a direct digital synthesizer using a digital circuit system that generates a drive signal for driving the ultrasonic transducer 2 to a resonance point. An amplifier circuit (AMP) 4 for amplifying the drive signal from the digital oscillation circuit 3, and a voltage signal phase θv and current as a feedback signal from the drive signal supplied to the ultrasonic transducer 2 via the amplifier circuit 4. A detection circuit 5 that detects a signal phase θi, a phase difference detection circuit 6 that detects a phase difference between a voltage signal phase θv that is a feedback signal from the detection circuit 5 and a current signal phase θi, and the digital oscillation circuit 3 A register that holds the digital frequency data that determines the oscillation frequency and can change the digital frequency data using an external signal And 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 provided between the phase difference detection circuit 6 and the register 7. Switch circuit 9 and a control circuit 10 for controlling the operation 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.

(Function)
In such a configuration, the control circuit 10 performs processing as shown in FIG. That is, at the start of oscillation in step S1, the digital frequency data of the data sending circuit 8 is sent to the register 7 with the switch circuit 9 disconnected, and the oscillation frequency of the digital oscillation circuit 3 is set to the ultrasonic transducer 2 in step S2. The resonance frequency fr is substantially matched.

  Since the ultrasonic vibrator 2 is supplied with a drive signal at or near the fundamental resonance frequency fr, an output very close to the feedback signal obtained when the ultrasonic vibrator 2 is driven at the fundamental resonance point, That is, a current phase signal and a voltage phase signal are detected.

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

  In order to drive the ultrasonic transducer efficiently, the coil Ld is connected in series or in parallel. The coil Ld is set so as to resonate with the braking capacity Cd of the ultrasonic transducer. That is, it sets so that fr = 1 / 2π√ (Ld × Cd). 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 is the lowest value R, and the phase difference between the voltage and the current is zero. At this point, all the electric 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 voltage and current before and after the resonance point. As can be seen from the figure, the current phase is delayed when the drive frequency is low around the frequency fr, and the current phase is advanced when the drive frequency is high. Therefore, by adjusting the drive frequency based on the phase difference between the voltage phase and the current phase, even if the resonance frequency fr of the ultrasonic transducer fluctuates due to load fluctuation or temperature change, it follows between the frequencies f1 and f2. Therefore, tracking control that always drives at the resonance frequency is possible.

  After maintaining the state in which these feedback signals can be obtained by the detection circuit 5, that is, after starting the ultrasonic transducer 2, returning to FIG. 2, the switch circuit 9 is turned on by the control circuit 10 in step S 3. Then, a feedback signal (U / D) that increases or decreases the digital frequency data held in the register 7 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. ) Is input to the register 7, and the frequency of the digital oscillation circuit 3 changes, and the PLL operation is performed digitally.

(effect)
As described above, in the ultrasonic driving apparatus 1 of the present embodiment, 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 at the time of activation, and then the phase difference detection circuit. The digital frequency data held in the register 7 is raised or lowered by a feedback signal (U / D) based on the phase difference between the voltage phase signal θv and the current phase signal θi input to 6, and the digital oscillation circuit 3 Since the oscillation frequency is varied, the drive signal given to the ultrasonic transducer 2 is adjusted, and the ultrasonic transducer 2 can be reliably driven at the resonance frequency fr.

  In this case, if the frequency data sent from the data sending circuit 8 is f1 or less or f2 or more, the tracking control of the resonance point fr by the frequency adjusting mechanism composed of the above-described means based on the feedback signal obtained at the start-up. Is impossible from the beginning. In that case, the frequency data sent out from the data sending circuit 8 is set again in the vicinity of fr, then sent to the register 7, and the frequency of the drive signal generated by the digital oscillation circuit 3 is made near fr to resonate again. The tracking operation is performed.

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

  Since the second embodiment is almost the same as the first embodiment, only different points will be described.

(Constitution)
In the second embodiment, digital frequency data corresponding to each resonance frequency fr of various ultrasonic transducers 2a, 2b, and 2c having different resonance frequencies fr is configured.

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

  On the other hand, the ultrasonic drive device 1 is connected to a connector 23 to which plugs 21a, 21b, and 21c can be connected, and ultrasonic transducers 2a, 2b, and 2c connected by recognizing the identification units (ID) 22a, 22b, and 22c. And the data transmission circuit 8 determines the resonance frequency fr of the ultrasonic transducers 2a, 2b, and 2c stored in advance or a frequency in the vicinity thereof based on the determination result by the recognition circuit 24. The digital frequency data shown is selectively sent to the register 7.

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

  Here, the ultrasonic transducers 2a, 2b, and 2c can be used for a plurality of types of handpieces according to applications in the ultrasonic surgical system.

(effect)
As described above, according to the present embodiment, in addition to the effects of the first embodiment, when the resonance frequency fr differs depending on the type of the ultrasonic transducers 2a, 2b, and 2c, digital frequency data corresponding to the ultrasonic transducer is preliminarily stored. Resonance point tracking control can be reliably performed by each ultrasonic transducer by providing the data transmission circuit 8 and selectively sending it to the register 7 using the result of the recognition circuit 24 and starting it. .

  FIG. 4 is a block diagram showing the configuration of the ultrasonic driving apparatus according to the 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 are denoted by the same reference numerals and description thereof will be omitted.

(Constitution)
The third embodiment is configured such that frequency data corresponding to the resonance frequency fr of various ultrasonic transducers 2a, 2b, and 2c can be obtained directly from each ultrasonic transducer.

  That is, as shown in FIG. 4, various ultrasonic transducers 2a, 2b, 2c have resonance frequency values of the ultrasonic transducers inside plugs 21a, 21b, 21c for selective connection to the apparatus. Data holding units (DATA) 31a, 31b, and 31c that hold the digital frequency data shown are provided. In the ultrasonic driving apparatus 1, the data transmission circuit 8 is configured to read the digital frequency data of the data holding units (DATA) 31 a, 31 b, 31 c and send the frequency data to the register 7.

(Function)
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 data is transmitted to the data transmission circuit 8. Is transferred to and held in the register 7 and sent to the register 7 to be activated.

(effect)
As described above, the present embodiment can provide the same effects as those of the second embodiment.

  FIGS. 5 to 7 relate to the fourth embodiment of the present invention, FIG. 5 is a block diagram showing the configuration of the ultrasonic drive device, FIG. 6 is a flowchart for explaining the operation of the ultrasonic drive device of FIG. 6 is an explanatory diagram illustrating a frequency sweep (sweep) 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 are denoted by the same reference numerals and description thereof will be omitted.

(Constitution)
In Example 4, as shown in FIG. 5, a handpiece 41 that is a treatment instrument for performing an operation in the ultrasonic surgical system is fastened to the ultrasonic vibrator 2 and the ultrasonic vibrator 2 with a screw structure. The probe 42 can be selectively used depending on the application. For example, there are a general straight type probe 42a and a bent type probe 42b. When each probe 42 is fastened to the ultrasonic transducer 2, the resonance frequency of the handpiece 41 at that time is different.

  The ultrasonic drive device 1 of this embodiment is proportional to the resonance point detection circuit 51 that detects the resonance point of the handpiece 41 and the digital frequency data that is transmitted to the register 7 and held in the register 7 at an arbitrary ratio. A pulse generation circuit 52 that generates a signal for increasing or decreasing the frequency of the signal, and the output of the phase difference detection circuit 6 or the output of the pulse generation circuit 52 is selectively switched based on the detection result of the resonance point detection circuit 51 to register 7 Switches 53, a data transmission circuit 54 for transmitting frequency data higher or lower by a certain amount than the resonance frequency of the handpiece 41 to the register 7, and operations of the pulse generation circuit 52 and the data transmission circuit 54. The control circuit 55 is configured to include.

(Function)
The operation in this embodiment having the above-described configuration will be described with reference to FIG. First, at the time of activation, in step S11, frequency data fr + Δf that is higher than the frequency fr near the resonance frequency of the handpiece 41 by a certain frequency Δf is sent to the register 7 from the data sending circuit 54. In step S12, the oscillation circuit 3 generates a drive signal having a 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. 7, the resonance frequency of the handpiece when the probe 42a is fastened to the ultrasonic transducer 2 is fr1, and the resonance frequency when the probe 42b is fastened to the ultrasonic transducer 2 is fr2. , Fr + Δf> f2> f1, the frequency of 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. There is no tracking.

  Returning to FIG. 6, next, in step S13, a pulse signal is generated from the pulse generation circuit 52, and the digital frequency data in the register 7 is sequentially decreased. For example, the frequency data in the register is lowered by 1 Hz with one rising pulse. If 1000 pulses are sent periodically, the frequency data in the register will drop smoothly 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 (see FIG. 7).

  As described above, the ultrasonic transducer 2 is supplied with a frequency signal that gradually changes from the frequency higher than the resonance point toward the resonance frequency. During this period, the frequency signal is supplied based on the detection signal from the detection circuit 5 in step S14. Whether or not the resonance frequency is the resonance frequency is monitored by the resonance point detection circuit 51. If it is not the resonance point, the above-described sweep operation is continued. When the resonance point is detected, the switch 53 is switched in step S15 to detect the phase difference. The output of circuit 6 is selected to be supplied to 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 register 7 is controlled by a 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 is started by raising or lowering the frequency data.

(effect)
As described above, according to the present embodiment, in addition to the effects of the first embodiment, when the resonance frequency of the probe fastened to the ultrasonic transducer 2 is different, the resonance point is found during the sweep for each probe. Thus, the switch 53 is switched, and a feedback signal in a range in which the resonance point can be tracked (f1 to f2 in FIG. 11) is obtained. Therefore, frequency tracking control by the PLL can be reliably performed.

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

  The fifth embodiment is different from the second embodiment and the fourth embodiment in that the configurations of the ultrasonic drive devices of the second and fourth embodiments are applied to an ultrasonic surgical system. Only the same components are denoted by the same reference numerals, and description thereof is omitted.

(Configuration and action)
As shown in FIG. 8, the ultrasonic surgical system 61 of this embodiment is composed of a foot switch 62 for turning on / off an output, a device main body 63 including an ultrasonic drive device, and a plurality of types. It is comprised from the handpiece 64 according to the use which has a resonant frequency.

  The hand piece 64 includes a hand piece 64a in which a probe can be exchanged, a hand piece 64b to which a bending type probe is attached, a hand piece 64c having a scissor type probe, and the like. Each is provided with a plug 21 so as to be selectively connectable to the apparatus main body 63, and inside the plugs 21a, 21b, 21c, an identification unit identification unit (ID) for identifying each handpiece. 22a, 22b, and 22c (hereinafter referred to as 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 recognize which handpiece 64 is connected to the connector 23. A recognition circuit 24, a data transmission circuit 8 for selecting digital frequency data held in advance according to the determination result of the recognition circuit 24, and sending it to the register 7, and another sub-receiver for receiving digital frequency data from the data transmission circuit 8 There is a register 66 and a comparison circuit 67 for comparing the data in the register 7 and the sub-register 66. As described in the second embodiment, a hand piece 64 connected to the connector 23 by the recognition circuit 24 from a plurality of types of hand pieces. And the digital frequency data from the data transmission circuit 8 is registered in the register 7 based on the determination result. Is transmitted, the driving signal of the frequency is supplied to the ultrasonic transducer of the handpiece 64.

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

  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, the frequency of the digital oscillation circuit 3 is changed, and the ultrasonic vibrator of the handpiece 64 is changed. The frequency of the supplied drive signal is scanned. Meanwhile, the resonance point of the handpiece 64 is monitored by the resonance point detection circuit 51. When the resonance point is found, the switch 53 is switched, and the resonance point by the PLL operation based on the feedback signal (U / D) from the phase difference detection circuit 6 is detected. Tracking control is performed.

  The apparatus main body 63 further includes a conversion circuit 71 that receives a signal indicating the magnitude of the current flowing through the ultrasonic vibrator of the handpiece 64 from the detection circuit 5 and rectifies it to convert it into a DC voltage, and a control circuit. The D / A conversion circuit 72 that converts a signal for setting the magnitude of the current flowing through the ultrasonic vibrator of the handpiece 64 from the analog signal into the analog signal, and the signals of the conversion circuit 71 and the D / A conversion circuit 72 are compared. Differential amplification circuit 73, and a multiplying voltage control amplification circuit 74 that amplifies the frequency signal from the digital oscillation circuit 3 in proportion to the magnitude of the output signal of the differential amplification circuit 73. The constant current control circuit 75 is configured so that the value of the current flowing through the ultrasonic transducer of the piece 64 is constant.

  Further, in the driving device 63, in addition to the register 7 holding the digital frequency data of the frequency generated by the digital oscillation circuit 3, as described above, the sub-register holding the frequency data received from the data sending circuit 8 as it is. 66 is provided to compare the digital frequency data of the register 7 having the digital frequency data that has been changed by the phase tracking control after the activation and the initial digital frequency data of the sub-register 66 with the comparison circuit 67. We are trying to compare and monitor.

  Further, the apparatus main body 63 is provided with an indicator 77 constituted by an LED bar graph or the like, and the ultrasonic vibrator is shown by indicating the magnitude of the voltage or current applied to the ultrasonic vibrator by a bar graph. The driving state can be displayed.

  Note that the control circuit 78 is a control circuit that controls the overall operation of the apparatus main body 63, and exchanges data with the operation panel 79, and sends the data to the D / A conversion circuit 72 so as to flow through the ultrasonic transducer. That is, the amplitude is set. In addition, by manually inputting digital frequency data corresponding to each handpiece from the operation panel 79, the digital frequency data input as an initial value from the control circuit 78 to the data transmission circuit 8 can be set. is there.

(effect)
As described above, according to this embodiment, in addition to the effects of Embodiments 2 and 4, the constant current control circuit 75 uses the fact that the vibration amplitude of the ultrasonic transducer is proportional to the magnitude of the flowing current. The ultrasonic transducer can be driven with a stable amplitude by controlling the current value to be constant.

  The comparison circuit 67 compares and monitors the digital frequency data in the register 7 having the digital frequency data that changes every moment, and the initial digital frequency data in the sub-register 66. If the difference greatly exceeds a predetermined value, it can be determined that some abnormality has occurred. Therefore, the result is sent to the digital oscillation circuit 3 to stop the oscillation or transmitted to the control circuit 78 to operate. The panel 79 can issue a warning or stop the entire operation. Depending on this operation, for example, it is possible to detect a state in which an abnormality occurs in the ultrasonic transducer or the probe and the resonance point fluctuates extremely greatly, or the resonance point no longer exists due to disconnection or destruction.

  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.

1 is a block diagram showing the configuration of an ultrasonic drive device according to Embodiment 1 of the present invention. Flowchart for explaining the operation of the ultrasonic drive device of FIG. FIG. 3 is a block diagram showing the configuration of an ultrasonic drive device according to Embodiment 2 of the present invention. FIG. 5 is a block diagram illustrating a configuration of an ultrasonic drive device according to a third embodiment of the invention. FIG. 6 is a block diagram showing the configuration of an ultrasonic drive device according to Embodiment 4 of the present invention. Flowchart for explaining the operation of the ultrasonic drive device of FIG. Explanatory drawing explaining the frequency sweep (sweep) operation | movement in the process of FIG. FIG. 6 is a block diagram showing the configuration of an ultrasonic drive device according to Embodiment 5 of the present invention. Diagram showing a typical electrical equivalent circuit when an ultrasonic transducer and a matching coil are connected in parallel The figure which shows the impedance characteristic of the equivalent circuit of FIG. The figure which shows the phase relationship of the voltage and electric current before and behind the resonance point at the time of the drive of an ultrasonic transducer Block diagram showing the configuration of a conventional ultrasonic drive device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Ultrasonic drive device 2 ... Ultrasonic vibrator 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 Agent Patent attorney Susumu Ito

Claims (4)

In an ultrasonic drive device that can connect a plurality of ultrasonic transducers and enables drive control according to the connected ultrasonic transducers,
Ultrasonic drive signal oscillating means for oscillating an ultrasonic drive signal for driving the ultrasonic transducer based on predetermined frequency data;
Ultrasonic drive signal detecting means for detecting the ultrasonic drive signal applied to the connected ultrasonic transducer;
Initial frequency data storage means for storing initial frequency data predetermined according to the plurality of ultrasonic transducers;
Ultrasonic transducer recognition means for recognizing the type of connected ultrasonic transducer;
Initial frequency data sending means for reading the initial frequency data according to the type of the ultrasonic vibrator recognized by the ultrasonic vibrator recognition means from the initial frequency data storage means, and sending the initial frequency data;
The driving of the ultrasonic driving signal oscillating means is started at an initial driving frequency corresponding to the initial frequency data sent from the initial frequency data sending means, and based on the detection result from the ultrasonic driving signal detecting means Frequency control means for controlling the oscillation frequency of the ultrasonic drive signal oscillating means to vary, and
An ultrasonic drive device characterized by comprising: In an ultrasonic drive device that can connect a plurality of ultrasonic transducers and enables drive control according to the connected ultrasonic transducers,
Ultrasonic drive signal oscillating means for oscillating an ultrasonic drive signal for driving the ultrasonic transducer based on predetermined frequency data;
Ultrasonic drive signal detecting means for detecting the ultrasonic drive signal applied to the connected ultrasonic transducer;
Initial frequency data storage means for storing initial frequency data predetermined according to the plurality of ultrasonic transducers;
Ultrasonic transducer recognition means for recognizing the type of connected ultrasonic transducer;
Initial frequency data sending means for reading the initial frequency data according to the type of the ultrasonic vibrator recognized by the ultrasonic vibrator recognition means from the initial frequency data storage means, and sending the initial frequency data;
The driving of the ultrasonic driving signal oscillating means is started at an initial driving frequency corresponding to the initial frequency data sent from the initial frequency data sending means, and based on the detection result from the ultrasonic driving signal detecting means Frequency control means for controlling the oscillation frequency of the ultrasonic drive signal oscillating means to vary, and
An abnormality determination means that compares the initial drive frequency with a drive frequency that is currently driving the ultrasonic transducer, and determines an abnormality of the ultrasonic drive device according to the comparison result;
An ultrasonic drive device characterized by comprising:   In an ultrasonic drive device that can connect a plurality of ultrasonic transducers and enables drive control according to the connected ultrasonic transducers,
  Ultrasonic drive signal oscillating means for oscillating an ultrasonic drive signal for driving the ultrasonic transducer based on predetermined frequency data;
  Ultrasonic drive signal detecting means for detecting the ultrasonic drive signal applied to the connected ultrasonic transducer;
  Initial frequency data input means for inputting initial frequency data stored in the plurality of ultrasonic transducers;
  Initial frequency data sending means for sending initial frequency data stored in the ultrasonic transducer inputted in the initial frequency data input means;
  The driving of the ultrasonic driving signal oscillating means is started at an initial driving frequency corresponding to the initial frequency data sent from the initial frequency data sending means, and based on the detection result from the ultrasonic driving signal detecting means Frequency control means for controlling the oscillation frequency of the ultrasonic drive signal oscillating means to vary, and
  An ultrasonic drive device characterized by comprising:   In an ultrasonic drive device that can connect a plurality of ultrasonic transducers and enables drive control according to the connected ultrasonic transducers,
  Ultrasonic drive signal oscillating means for oscillating an ultrasonic drive signal for driving the ultrasonic transducer based on predetermined frequency data;
  Ultrasonic drive signal detecting means for detecting the ultrasonic drive signal applied to the connected ultrasonic transducer;
  Initial frequency data input means for inputting initial frequency data stored in the plurality of ultrasonic transducers;
  Initial frequency data sending means for sending initial frequency data stored in the ultrasonic transducer inputted in the initial frequency data input means;
  The driving of the ultrasonic driving signal oscillating means is started at an initial driving frequency corresponding to the initial frequency data sent from the initial frequency data sending means, and based on the detection result from the ultrasonic driving signal detecting means Frequency control means for controlling the oscillation frequency of the ultrasonic drive signal oscillating means to vary, and
  An abnormality determination means that compares the initial drive frequency with a drive frequency that is currently driving the ultrasonic transducer, and determines an abnormality of the ultrasonic drive device according to the comparison result;
  An ultrasonic drive device characterized by comprising:

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