JP2004000732A - Ultrasonic surgical device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic surgical device which can be quickly set under an ultrasonic surgery operable state by detecting whether or not an ultrasonic surgical utensil is under a normal using state, and at the same time, can perform an accurate control and so forth. <P>SOLUTION: In a device body, a plurality of hand pieces having built-in ultrasonic oscillators, or the like, driven by different resonant frequencies are selectively connected. In the device body, when a starting means 24 is turned on, a control circuit 9 starts the operation, and a frequency sweep is performed by a reference oscillator 7 which is formed by a direct digital synthesizer 7b. In this case, a resonance point detecting circuit 15 transmits a detection result corresponding to the resonance point by the phases or the like of a voltage and current of a driving signal applied to the hand pieces, to a CPU 28 of the control circuit 9. When the resonance point is detected, frequency data at the resonance point is stored in a RAM 21a of a storage means. When a processing output is actually outputted, the oscillation is performed by the stored data. Thus, by performing the frequency sweep or the like by the digital data, a more accurate control operation and stable motions with less variations are made possible. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to an ultrasonic operation apparatus for performing an operation using ultrasonic waves.

Generally, it is desirable that a vibrator used in an ultrasonic scalpel for a surgical operation be driven at or near its fundamental resonance frequency. With respect to such a technique, a driving apparatus based on a PLL (Phase Locked Loop) system that controls the drive frequency and the resonance frequency so as to match each other is known as a known technique.

Among such prior arts, Japanese Unexamined Patent Application Publication No. 2-245275 discloses a technique in which a reference signal oscillator, a switch means for switching between a feedback signal and the reference signal are provided, and driving is performed by the reference signal when oscillation starts. I have.

FIG. 15 shows an ultrasonic surgical apparatus disclosed in Japanese Patent Application Laid-Open No. 2-245275 as a first conventional example.
This ultrasonic surgical apparatus comprises an apparatus main body 2 'and a handpiece 3' connected to the apparatus main body 2 '. The ultrasonic energy supplied from the apparatus main body 2' is applied to the handpiece 3 'by an ultrasonic machine. An ultrasonic transducer for converting into a signal is inherent. Further, the handpiece 3 'has various shapes as shown in 3a, 3b and 3c, and the ultrasonic transducers inherent therein according to the shape have respective resonance frequencies.

駆 動 The drive circuit 4 constituting the apparatus main body 2 'generates a signal for generating ultrasonic energy. An amplifier 5 is connected to the drive circuit 4. The amplifier 5 power-amplifies the ultrasonic energy signal generated by the drive circuit 4.

Amplifier 5 is connected to detection circuit 6. The detection circuit 6 detects voltage and current phase signals θv and θi from the ultrasonic energy amplified by the amplifier 5. At this time, the detected voltage phase signal θv is transmitted to the drive circuit 4. The detection circuit 6 is connected to the handpiece 3 ′ and supplies ultrasonic energy to the handpiece 3.

装置 Further, a reference oscillator 7 is provided in the apparatus main body 2 ′, and the reference oscillator 7 is an oscillator that oscillates at the ultrasonic frequency that is driven first by the drive circuit 4. Since the handpiece 3 has each resonance frequency, the handpiece 3 is provided with reference oscillation frequency changing means Ra, Rb, Rc so as to oscillate at a frequency near each resonance frequency.

切 り 替 え Switching means 8 is connected to the reference oscillator 7. The switching means 8 is transmitted with the current phase signal θi detected by the detection circuit 6 described above. The switching means 8 receives a signal of the reference frequency oscillated from the reference oscillator 7, and performs switching so that the signal of the reference frequency input from the reference oscillator 7 is transmitted to the drive circuit 4 during driving oscillation. Can be The control circuit 9 is connected to the switching means 8. The output SW 10 is connected to the control circuit 9. The output SW 10 transmits an ON / OFF signal for driving the handpiece 3 to the control circuit 9. The control circuit 9 controls the switching unit 8 so that the output of the switching unit 8 switches to the current phase signal θi detected by the detection unit 6 after a certain time has elapsed after the output SW 10 is turned on.

The drive circuit 4 includes a phase comparator 11, a low-pass filter 12, and a VCO 13. The voltage phase signal θv detected by the detection circuit 6 is input to one end of the phase comparator 11, and the signal of the reference frequency or the current phase signal θi input from the switching means 8 is input to the other end. A signal is output to set the frequency so that the phases of the waveforms match.

ロ ー A low-pass filter 12 is connected to the phase comparator 11. The signal output from the phase comparator 11 is filtered through a low-frequency component to generate a voltage necessary for matching the voltage phase with the current phase.

The VCO 13 is connected to the low-pass filter 12. The VCO 13 transmits a frequency at which the voltage phase and the current phase coincide with each other by the voltage generated by the low-pass filter 12 to the amplifier 5 to realize PLL control.

In contrast to the first conventional example, in Japanese Patent Application Laid-Open No. 2-265681 as a second conventional example, switch means for switching between a reference oscillator, a feedback signal and the reference signal is provided, and the reference oscillator is located near a resonance point. A technique has been disclosed in which a vibrator is swept and switched to a feedback signal at the moment of crossing a resonance point.

FIG. 16 shows an ultrasonic surgical apparatus disclosed in Japanese Patent Application Laid-Open No. 2-265681.
In the description of the second conventional example, a part overlapping with the part described in the first conventional example will be omitted.

検 出 The detection circuit 6 connected to the amplifier 5 detects the voltage phase signal θv and the current phase signal θi and also detects the impedance | z | when the handpiece 3 is driven. The resonance point detection circuit 15 is connected to the detection circuit 6.

The voltage phase signal θv, the current phase signal θi, and the impedance | z | detected by the detection circuit 6 are transmitted to the resonance point detection circuit 15. The resonance point detection circuit 15 includes a phase comparator for judging whether the phases match from the voltage phase signal θv and the current phase signal θi, and an impedance | It is constituted by voltage minimum value detection means and the like utilizing the characteristic that z | takes the minimum value.

The control circuit 9 is connected to the output SW 10 and the reference oscillator 7. When the output ON signal is transmitted to the control circuit 9 by the output SW 10, the frequency near the resonance frequency of the handpiece 3 is swept from the high frequency to the low frequency relative to the resonance frequency and vice versa with respect to the reference oscillator 7. Is controlled.

At that time, the values of the voltage phase signal θv, the current phase signal θi, and the impedance | z | detected by the detection circuit 6 change. Among the changes, it is determined that the frequency swept by the resonance point detection circuit 15 is the resonance point.

At this time, the PLL control is performed by switching the switching means 8 from the reference oscillator 7 that sweeps the frequency to the current phase signal θi of the detection circuit 6.
JP-A-2-245275 JP-A-2-265681

In the configuration of Japanese Patent Application Laid-Open No. 2-245275, if a certain fixed reference signal generated by the reference oscillator 7, that is, the frequency divergence between the reference frequency and the resonance frequency is large, when switching to the current phase signal θi, that is, the feedback signal, In some cases, the PLL control that attempts to change the frequency operates, so that the driving may not be stable.

Therefore, in the configuration of JP-A-2-265681, a frequency near the resonance frequency is once swept by the reference oscillator 7 and the current phase signal θi, that is, the feedback signal is obtained when the resonance point detection circuit 15 determines the resonance frequency. The above problem is solved by switching.

However, in this known technique, since the reference signal from the reference oscillator 7 can be made to coincide with the resonance frequency only after the output SW10 is turned on, it takes time to reach the PLL control, and it takes time until the desired output is selected. Take it.

This indicates a poor response after pressing the output SW10, which may cause some discomfort to the operator and lead to a redundant operation time for the patient, thereby increasing intra-operative and post-operative stress. There is a possibility.

Also, in endoscopic surgery, ultrasonic treatment tools having various treatment section shapes are prepared, and ultrasonic transducers and ultrasonic treatment tools that actually generate ultrasonic mechanical vibrations from electrical signals are available. Is usually configured to be detachable by a method such as screw fastening.

Naturally, the transmission of ultrasonic mechanical vibration from the ultrasonic transducer to the ultrasonic treatment unit is performed via the screw fastening part. However, if the mechanical fastening is weak, the ultrasonic vibrator transmits the ultrasonic mechanical vibration to the ultrasonic treatment tool. Vibration may not be transmitted 100%, and the treatment efficiency of the distal end may decrease.

発 熱 Furthermore, since heat and stress due to ultrasonic mechanical vibration are constantly applied to the ultrasonic treatment section, cracks may occur at one corner of the ultrasonic treatment section. This may reduce transmission efficiency of mechanical vibration due to cracks, and may make it impossible to obtain desired incision ability and coagulation ability in the treatment section.

In such a case, in the above-described known prior art, when the operator actually performs the treatment, the operator can judge for the first time by outputting the output with the output SW10 for outputting the treatment output. A complicated act such as replacing the handpiece 3 as an instrument may occur.

(Object of the invention)
The present invention has been made in view of the above points, and an object of the present invention is to provide an ultrasonic surgical apparatus which can be set to a state where an ultrasonic operation is performed quickly and which can perform highly accurate control and the like.

A handpiece having an ultrasonic vibrator capable of generating ultrasonic vibration,
A digital synthesizer capable of oscillating a signal for driving the ultrasonic transducer,
Frequency sweeping means for outputting digital data whose data changes every moment to the digital synthesizer, and frequency sweeping the signal.
A resonance frequency detection circuit that detects a resonance frequency of the handpiece based on a signal that is frequency-swept by the frequency sweeping unit and supplied from the digital synthesizer to the ultrasonic vibrator;
When the resonance frequency detection circuit detects a resonance frequency, storage means for storing the resonance frequency information,
It is characterized by having.

According to the present invention, a handpiece having an ultrasonic vibrator capable of generating ultrasonic vibration,
A digital synthesizer capable of oscillating a signal for driving the ultrasonic transducer,
Frequency sweeping means for outputting digital data whose data changes every moment to the digital synthesizer, and frequency sweeping the signal.
A resonance frequency detection circuit that detects a resonance frequency of the handpiece based on a signal that is frequency-swept by the frequency sweeping unit and supplied from the digital synthesizer to the ultrasonic vibrator;
When the resonance frequency detection circuit detects a resonance frequency, storage means for storing the resonance frequency information,
Therefore, when a resonance frequency is detected, it is possible to quickly set a state in which an ultrasonic operation is performed based on the resonance frequency information of the storage unit that stores the resonance frequency information, and to control with high accuracy by digital data. And a stable effect can be obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 5 relate to the first embodiment of the present invention. FIG. 1 shows the entire configuration of the ultrasonic surgical apparatus according to the first embodiment of the present invention, FIG. 2 shows the configuration of the starting means, and FIG. FIG. 4 shows the contents of the operation, and FIG. 5 shows a characteristic diagram for explaining the operation.

As shown in FIG. 1, the ultrasonic surgical apparatus 1 according to the first embodiment of the present invention differs from the ultrasonic surgical apparatus 1 'shown in FIG. 16 in that a frequency storage for storing information for causing the reference oscillator 7 to oscillate at a resonance frequency is further provided. A means 21, a display circuit 22 for visually notifying and a sound source circuit 23 for audibly notifying as notifying means, and a starting means 24 for starting operation of the control circuit 9 and the like are provided.

This will be described in more detail below.
The ultrasonic surgical apparatus 1 includes an apparatus main body 2 and a handpiece 3 as an ultrasonic surgical instrument detachably connected to the apparatus main body 2, and an ultrasonic wave supplied from the apparatus main body 2 is supplied to the handpiece 3. It has a built-in ultrasonic transducer for converting energy into ultrasonic mechanical signals.

That is, the handpiece 3 has various shapes as indicated by reference numerals 3A, 3B and 3C, and the built-in ultrasonic vibrators 16a, 16b and 16c have respective resonance frequencies depending on the shape. The resonance frequency also varies depending on the length, thickness, etc. of the probes 17a, 17b, 17c.

駆 動 The drive circuit 4 constituting the apparatus main body 2 generates a signal for generating ultrasonic energy. An amplifier 5 is connected to the drive circuit 4. The amplifier 5 power-amplifies the ultrasonic energy signal generated by the drive circuit 4.

Amplifier 5 is connected to detection circuit 6. The detection circuit 6 detects the voltage phase signal θv and the current phase signal θi from the ultrasonic energy amplified by the amplifier 5 and drives the handpiece 3I (I = A, B, C,...). The impedance | z | is detected.

At this time, the detected voltage phase signal θv is transmitted to the drive circuit 4. The detection circuit 6 is connected to the handpiece 3I and supplies ultrasonic energy to the handpiece 3I.
Further, a reference oscillator 7 is provided in the apparatus main body 2, and the reference oscillator 7 is an oscillator that oscillates at an ultrasonic frequency driven first by the drive circuit 4.

切 り 替 え Switching means 8 is connected to the reference oscillator 7. The current phase signal θi detected by the detection circuit 6 described above is applied to the contact b to the switching means 8. Further, a signal of a reference frequency oscillated from the reference oscillator 7 is applied to the contact point a of the switching means 8, and a signal of the reference frequency input from the reference oscillator 7 is transmitted to the drive circuit 4 during driving oscillation. Can be switched.

切 り 替 え A control circuit 9 is connected to a switching control terminal of the switching means 8. This control circuit 9 is connected to the reference oscillator 7 and the output SW10. The output SW 10 transmits an ON / OFF signal for driving the handpiece 3 to the control circuit 9.

The drive circuit 4 includes a phase comparator 11 that performs phase comparison, a low-pass filter 12 that passes a low-frequency signal component in an output signal of the phase comparator 11, and a frequency corresponding to the voltage of the low-frequency signal component that has passed through the low-pass filter 12. It comprises a VCO 13 as a oscillating voltage controlled oscillator.

The voltage phase signal θv detected by the detection circuit 6 is input to one end of the phase comparator 11, and the signal of the reference frequency or the current phase signal θi input from the switching means 8 is input to the other end. A signal is output to set the frequency so that the phases of the waveforms match.

ロ ー A low-pass filter 12 is connected to the phase comparator 11. The signal output from the phase comparator 11 is filtered through a low-frequency component to generate a voltage necessary for matching the voltage phase with the current phase.

The VCO 13 is connected to the low-pass filter 12. The VCO 13 transmits a frequency at which the voltage phase and the current phase coincide with each other by the voltage generated by the low-pass filter 12 to the amplifier 5 to realize PLL control.

{Circle around (4)} The resonance point detection circuit 15 is connected to the output terminal of the detection circuit 6. The voltage phase signal θv, the current phase signal θi, and the impedance | z | detected by the detection circuit 6 are input to the resonance point detection circuit 15.

The resonance point detection circuit 15 is a phase comparator for judging whether the phases match from the voltage phase signal θv and the current phase signal θi, or an impedance | which is inherent in the handpiece 3 when driven at the resonance frequency. It is configured to include a minimum voltage value detecting means utilizing the characteristic that z | takes the minimum value.
In this embodiment, the output signal of the resonance point detection circuit 15 is input to the control circuit 9.

{Circle around (4)} The control circuit 9 is connected to the frequency storing means 21 for storing the frequency, the display circuit 22 and the sound source circuit 23 as the notifying means, and the starting means 24 for starting the control start operation.

Further, the start means 24 is connected to the handpiece 3I, and when the start means 24 is turned on, an operation start signal (actually, electric power) is input to the control circuit 9 and also input to the handpiece 3I (ultra high). The drive signal is input to the acoustic transducer 16i).

In this embodiment, before the output SW 10 sends the output ON signal, that is, when the control means 9 permits the control circuit 9 to start the control, the control circuit 9 makes the reference oscillator 7 close to the resonance frequency of the handpiece 3I. Is swept from a high resonance frequency to a low resonance frequency or vice versa.

At that time, when the handpiece 3I is connected, the resonance frequency is determined by the resonance point detection circuit 15. The detection result by the resonance point detection circuit 15 is sent to the control circuit 9. FIG. 2 shows the configuration of the starting means 24. As shown in FIG. 2, the start means 24 comprises a commercial power supply 26 and a power supply SW 27, and a control start signal is transmitted to the control circuit 9 at the same time when the power of the apparatus main body 2 is turned on (power is supplied. Start operation).

FIG. 3 shows a specific configuration of the reference oscillator 7, the control circuit 9, and the frequency storage unit 21. The reference oscillator 7 is composed of the VCO 7a. The control circuit 9 includes a CPU 28 having a built-in ROM 28a as a read-only memory storing an operation program and the like, and a D / A converter 29 connected to the CPU 28 for D / A converting and outputting the digital signal. I have. The frequency storage means 21 is constituted by a RAM 21a.

In the case of the above-described configuration, digital data for oscillating at a value near the resonance frequency output from the CPU 28 is converted into analog data (voltage value) by the D / A converter 29 to configure the reference oscillator 7. It is input to the VCO 7a.

At the time of frequency sweep, this can be realized by changing this analog data (voltage value) every moment. At this time, when the resonance point detection result from the above-described resonance point detection circuit 15 is transmitted to the control circuit 9 (the CPU 28 therein), the VCO 7a configuring the reference oscillator 7 via the D / A converter 29 at that time. The transmitted data is stored as data to be stored in the RAM 21a, which is the frequency storage means 21, in parallel.
That is, the CPU 28 stores (stores) the voltage data for causing the reference oscillator 7 to oscillate at the resonance frequency in the RAM 21a.

(4) At the time of treatment output at the time of treatment by the output SW 10, the CPU 28 extracts data from the RAM 21 a as the frequency storage means 21 so that the VCO 7 a as the reference oscillator 7 can be oscillated at the resonance frequency.

In the present embodiment, it is determined from the detection result by the resonance point detection circuit 15 whether a normal resonance frequency has been detected. When a normal resonance frequency can be detected, the CPU 28 of the control circuit 9 causes the reference oscillator 7 to oscillate with the data stored in the RAM 21a, and then switches the switching means 8 to perform treatment. Set to.

On the other hand, when a normal resonance frequency cannot be detected, the CPU 28 of the control circuit 9 makes a visual notification by the display circuit 22 as a notification means and an audible notification by the sound source circuit 23.

{Circle around (7)} By this notification, the surgeon can know that the handpiece 3I is in a state where normal use is not possible before performing the actual operation, that is, from the power-on state.

The operation of the ultrasonic surgical apparatus 1 having such a configuration will be described.
FIG. 4 shows a flow of the operation content of this embodiment. As shown in FIG. 1, the handpiece 3I is connected to the apparatus main body 2, and the power cord (plug) of the apparatus main body 2 is connected to the commercial power supply 26. Then, as shown in step S1, the power switch 27 of the starting means 24 is turned on. Then, power is supplied to the control circuit 9 from the start means 24 (constituting the first drive start means), and the control circuit 9 starts operating.

Next, as in step S2, the control circuit 9 controls the reference oscillator 7 to sweep the reference oscillator 7 so as to include a frequency range near the resonance frequency of the ultrasonic transducer.

In this case, the oscillation signal of the reference oscillator 7 is applied to the handpiece 3 through the drive circuit 4, the amplifier 5, and the detection circuit 6 via the contact point a of the switching means 8, and the voltage phase signal θv detected by the detection circuit 6 at that time. , The current phase signal θi and the impedance | z | Then, the resonance point detection circuit 15 outputs the resonance point detection result to the CPU 28 of the control circuit 9.

As shown in step S3, the CPU 28 of the control circuit 9 determines whether or not there is a resonance frequency based on the resonance point detection result by the resonance point detection circuit 15.
When the CPU 28 of the control circuit 9 determines that there is no normal resonance frequency, the display circuit 22 and the sound source circuit 23 notify the user as shown in step S4.

On the other hand, if it is determined in step S3 that there is a resonance frequency, the CPU 28 of the control circuit 9 stores data corresponding to the resonance frequency in the RAM 21a as the frequency storage means 21 as shown in step S5.

Then, as shown in step S6, by turning on the output SW10 (as the second drive start means), the ON signal is input to the CPU 28 of the control circuit 9.

Then, as shown in step S7, the control circuit 9 extracts the resonance frequency data from the frequency storage means 21 and drives the reference oscillator 7 at the resonance frequency with the resonance frequency data.
Next, as shown in step S8, the control circuit 9 switches so that the contacts a to b of the switching means 8 are turned on, and shifts to the PLL control operation near the resonance frequency.

Next, when the handpiece 3I is connected in a normal connection state, when the handpiece 3I is not connected, the ultrasonic vibrator 16i (i = a, b, c,...) Built in the handpiece 3I. ) And the detection operation of the resonance point detection circuit 15 when the probe 17i connected to the ultrasonic transducer 16i is damaged or loosened, and the like, will be specifically described with reference to FIG.

In FIGS. 5A, 5C, and 5E, the horizontal axis represents the frequency f, and the vertical axis represents the impedance | z |. The portion indicated by the thick solid line indicates the characteristics in the sweep frequency range (frequency fa to fb).

In FIG. 5A, for example, Ra indicates the characteristic of impedance | z | when sweeping from frequency fa to resonance frequency fr, and Rb indicates the characteristic of impedance | z | when sweeping from frequency fr to fb. Show. Rc indicates the characteristic of the impedance | z | at the resonance frequency (resonance point), and is minimized.

In FIG. 5C, Rc indicates the characteristic of impedance | z | when sweeping from frequency fa to the maximum frequency, Rd indicates the maximum impedance | z | portion, and Re indicates the impedance | z | Shows the characteristics of the impedance | z | when the frequency is swept from the maximum frequency to fb.
In this case, the frequency fc at which the impedance | z | is minimum is outside fb.
FIG. 5E shows a characteristic in which the impedance | z | is minimized at a plurality of frequencies fd, fr, and fe when sweeping from the frequency fa to the resonance frequency fb.

(5) The frequency characteristic (impedance | z | with respect to frequency) of the handpiece 3I near the resonance frequency in a normal state is as shown in FIG. When sweeping from the frequency fa lower than the resonance frequency fr, the voltage phase signal θv and the current phase signal θi have a relationship as shown in FIG. That is, in the frequency range Ra from the frequency fa to fr and the frequency range Rb from the frequency fr to fb, the phases of the voltage phase signal θv and the current phase signal θi are shifted.

In the resonance frequency range Rc, the output signal of the resonance point detection circuit 15 is inverted from “H” to “L” immediately before the voltage phase signal θv advances beyond the current phase signal θi when the resonance frequency fr is exceeded. (4) The above signal is transmitted to the CPU 28 of the control circuit 9. The data sent for sweeping to the reference oscillator 7 at that moment is digital data of a voltage oscillated at the resonance frequency, and the data is output from the CPU 28 of the control circuit 9 to the RAM 21 a of the frequency storage means 21. save.

When the output ON signal is transmitted to the CPU 28 of the control circuit 9 by the output SW 10 when actually outputting the signal, the reference oscillator 7 is used as the resonance frequency data obtained by sweeping the frequency from the RAM 21 a of the frequency storage means 21. Is controlled to drive the VCO 7a, and then the switching means 8 is switched to the contact b side to perform PLL control.

If the handpiece 3I is not connected when performing the above series of controls, there is no load of impedance | z | as shown in FIG. , The resonance frequency fr cannot be obtained by the resonance point detection circuit 15.

At that time, the information is transmitted to the CPU 28 of the control circuit 9, and the CPU 28 of the control circuit 9 visually and audibly notifies the user such as an operator through the display circuit 22 and the sound source circuit 23.

Further, when the ultrasonic vibrator 16i built in the handpiece 3I and the probe 17i connected to the ultrasonic vibrator 16i are damaged or loosened, FIG. 5C and FIG. It should have the impedance characteristics as shown in

In the case of FIG. 5C, when the sweep is performed according to the flow described in FIG. 4, the resonance frequency fr is not found, and the voltage phase signal θv and the current phase signal θi as shown in FIG. 5D are obtained. At a different frequency, the output of the resonance point detection circuit 15 reverses from "L" to "H" at the position where the impedance | z | peaks (in a normal case, the resonance frequency fr as shown in FIG. 5B). Is inverted from "H" to "L".

The CPU 28 of the control circuit 9 to which the signal of the resonance point detection circuit 15 is transmitted determines that the connected handpiece 3I does not have a resonance frequency within a desired frequency range, and the display circuit 22 and the sound source circuit At 23, the user is notified visually and audibly.

(5) When FIG. 5E is swept according to the above flow, the operation is such that there are many resonance frequencies. That is, in this case, as shown in FIG. 5F, the output of the resonance point detection circuit 15 is repeatedly inverted from "L" to "H" or "L".

The CPU 28 of the control circuit 9, to which the detection result from the resonance point detection circuit 15 is transmitted, determines that the connected handpiece 3I has no resonance frequency fr in a desired frequency range and cannot be driven normally. Judgment is made, and the user is visually and audibly notified by the blinking of the LED of the display circuit 22, the buzzer sound of the speaker or the buzzer of the sound source circuit 23, and the like.

Therefore, such a result can be obtained promptly after the power switch 27 is turned on (before the operator or a surgical assistant) before the operator actually performs the treatment. For this reason, in a normal state, the treatment can be smoothly performed.

に も Also, even when the state is not normal, it is possible to know that this state is present before the state where the treatment is performed, and to proceed to the operation of setting the state to the normal state promptly. For example, in response to the notification that the handpiece 3I is not normal, the connected handpiece 3I is exchanged or the state of the screwed portion is corrected, so that the connection state of the handpiece 3I can be quickly and smoothly set to the normal connection state. Easy to do.

Therefore, according to the present embodiment, it is possible to set the ultrasonic diagnostic apparatus 1 to a state in which treatment for treatment can be performed smoothly and quickly with a simple configuration.

Further, according to the present embodiment, when the handpiece 3I is actually driven by sweeping the frequency near the resonance frequency of the handpiece 3I in advance from the time of turning on the power, searching for the resonance frequency and holding the data, the resonance frequency is used. Can be driven with the reference frequency as a reference frequency, so that the response at the time of driving the handpiece can be improved, and if the probe does not have a resonance frequency or the connection between the ultrasonic vibrator 16i and the probe 17i in the handpiece 3I is poor. Moreover, even in the event that the ultrasonic transducer 16i or the probe 17i is damaged, it is possible to promptly notify the user of the condition, the complexity of the user is reduced, and the burden on the patient during and after surgery is reduced. May be

Further, the control circuit 9 is composed of the CPU 28, the D / A converter 29, and the frequency storage means 21 with the RAM 21a, so that it is easy to perform an extended design, and the complexity of adjustment and the like can be solved by a program. , Easy to develop.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 6 shows a configuration around the frequency storage means 21 according to the second embodiment of the present invention. In the present embodiment, for example, the frequency storage unit 21 of the first embodiment is not a RAM 21a but a second D / A converter 21b, and its input terminal is connected to the CPU 28 and its output terminal is connected to the VCO 7a. ing.

In this embodiment, when the detection result of the resonance point detection circuit 15 is input to the CPU 28, the CPU 28 stores the data transmitted to the first D / A converter 29 when the resonance frequency is detected. To the second D / A converter 21b.

At the time of output by the output SW 10, the voltage value at which the VCO 7 a constituting the reference oscillator 7 oscillates at the resonance frequency by chip-selecting the second D / A converter 21 b as the frequency storage means 21 by the CPU 28 of the control circuit 9. Can be output.
Other configurations are the same as those of the first embodiment.

In this embodiment, there is an effect that the frequency storage means 21 in the first embodiment can be constituted by relatively inexpensive means such as the expensive RAM 21a to the D / A converter 21b.

{Circle around (2)} Since an operation program that shares frequency sweep data up to the resonance frequency with the first D / A converter 29 may be adopted, the program configuration can be simplified. The other effects are almost the same as those of the first embodiment.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 7 shows a configuration around the control circuit 9 in the third embodiment of the present invention. In the present embodiment, the control circuit 9 includes a voltage varying unit 31, a first switching unit 32, and a second switching unit 33. Further, the frequency storage means 21 includes a voltage storage circuit 21c.

The voltage varying means 31 is connected to the starting means 24, and a fluctuating voltage is applied to the VCO 7 a as the reference oscillator 7 via the first switching means 32, and is oscillated at a frequency near the resonance frequency including the resonance frequency. At the same time, this voltage is transmitted to the voltage storage means 21c via the second switching means 33.

When the resonance frequency is detected as a result of the resonance point detection circuit 15, the second switching means 33 is closed by the output of the resonance point detection circuit 15, and the voltage is applied to the VCO 7a as the reference oscillator 7 at that time. The stored voltage value is stored in the voltage storage unit 21c.

Further, when the output ON operation is performed by the output SW 10, the first switching unit 32 controls the output SW 10 so that the voltage of the voltage storage unit 21 c as the frequency storage unit 21 is applied to the VCO 7 a as the reference oscillator 7. The switching is performed, and the VCO 7a can oscillate at the resonance frequency.
Other configurations are the same as in the first embodiment.

In the present embodiment, there is an effect that the control circuit 9 and the frequency storage means 21 in the first embodiment can be constituted by very inexpensive means such as expensive CPU 28, RAM 21a and D / A converter 29. The other effects are almost the same as those of the first embodiment.

Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 8 shows a configuration around the control circuit 9 in the fourth embodiment of the present invention. This embodiment corresponds to a configuration of a modification of the first embodiment.
The reference oscillator 7 is constituted by a DDS (Direct Digital Synthesizer) 7b. The control circuit 9 is constituted by a CPU 28 having a built-in ROM 28a. The frequency storage means 21 is constituted by a RAM 21a.

In the case of the above configuration, the digital data output from the CPU 28 and having a value near the resonance frequency is directly input to the DDS 7b which is the reference oscillator 7. At the time of frequency sweep, this can be realized by digital data changing every moment.

At this time, when the resonance point detection result from the resonance point detection circuit 15 is transmitted to the CPU 28 of the control circuit 9, the digital data transmitted at that time is stored in the RAM 21a as the frequency storage unit 21. At the time of output by the output SW 10, the CPU 28 extracts data from the RAM 21 a as the frequency storage means 21, so that the DDS 7 b as the reference oscillator 7 can be oscillated at the resonance frequency.

FIG. 9 shows a case where the impedance | z | is input to the resonance point detection circuit 15. The resonance point detection circuit 15 includes a variable reference voltage means 35 and a comparator 36. FIG. 10 shows the variable reference voltage 35, the input impedance | z | and the detection signal at the time of the sweep, as shown in FIG. 10, and it is possible to obtain the same result as when the resonance point detection circuit 15 is configured by a phase comparator. Understand.

FIGS. 10 (A), (C) and (E) are substantially the same as FIGS. 5 (A), (C) and (E). By setting a reference voltage and comparing the reference voltage with a voltage that changes with the impedance | z | detected by the detection circuit 6 by the comparator 36, FIGS. 10A, 10C, and 10E ), Detection outputs as shown in FIGS. 10 (B), (D), and (F) can be obtained.

That is, in a normal case, a detection signal that changes from the “L” level to the “H” level in a pulse manner at the resonance frequency fr is obtained as shown in FIG.
On the other hand, in an abnormal state, a pulse-like detection signal which is always at the "L" level and becomes "H" level as shown in FIG. 10D is not obtained, or as shown in FIG. As a result, a plurality of pulse-like detection signals having the “H” level will be detected, and it can be distinguished from a normal state.

In the present embodiment, in addition to the third embodiment, analog control is eliminated from the variable oscillator (reference oscillator 7), so that more accurate control can be performed, and elements due to temperature characteristics, component variations, and the like are eliminated. Therefore, a more stable effect can be obtained. Otherwise, substantially the same effects as in the first embodiment can be obtained.

Next, a fifth embodiment of the present invention will be described with reference to FIG. The ultrasonic surgical apparatus 1 shown in FIG. 11 is different from the ultrasonic surgical apparatus 1 in FIG. 1 in that a variable oscillator, more specifically, a DDS (direct digital synthesizer) 37 is used instead of the VCO 12 constituting the drive circuit 4. . This DDS 37 is connected to the control circuit 9.

超 Further, the ultrasonic surgical apparatus 1 of FIG. 1 has a configuration in which the reference oscillator 7 and the switching means 8 are omitted. Then, the voltage phase signal θv and the current phase signal θi of the detection circuit 6 are input to the resonance point detection circuit 15 and also to the phase comparator 13.

The output of the phase comparator 13 is input to the low-pass filter 11 and also to the control circuit 9. Other configurations are the same as in the first embodiment.

First, before the output ON signal of the output SW 10 is transmitted, the handpiece 3 is swept from the control circuit 9 to the DDS 37 as a variable oscillator by changing the frequency near the resonance frequency from a high frequency to a low frequency or a reverse frequency shift. The digital data is transmitted as follows.

At this time, the voltage phase signal θv and the current signal θi detected by the detection circuit 6 are transmitted to the phase comparator 13 and the resonance point detection circuit 15. When the frequency oscillated by the DDS 37 as the variable oscillator is the resonance frequency as a result obtained by the resonance point detection circuit 15, the digital data transmitted to the DDS 37 at that time is stored in the frequency storage unit 21. Let me save.
Hereinafter, the control and operation when the output is turned on by the output SW 10 or when the resonance frequency is not detected by the resonance point detection circuit 15 are the same as those in the first embodiment.

In the present embodiment, in addition to the configuration of the fourth embodiment, the reference oscillator 7 and the variable oscillator of the drive circuit 4 are shared by the DDS 37 in addition to the configuration, so that the reference oscillator 7 can be reduced. The effect that can be done. Otherwise, substantially the same effects as in the first embodiment can be obtained. Also, in the present embodiment, a configuration of a modified example in which the resonance point detection circuit 15 is omitted may be adopted. That is, since the output result of the phase comparator 13 is also transmitted to the control circuit 9, the output result of the phase comparator 13 of the drive circuit 4 in the case of the first embodiment in which the resonance point detection circuit 15 is a phase comparator. It is apparent that the same operation and effect can be obtained by directly transmitting the result to the control circuit 9, and the resonance point detection circuit 15 at that time can be eliminated as a configuration.

In this modification, in addition to the third embodiment, the resonance frequency detection performed by the resonance point detection circuit 15 is shared with the phase comparator 13 included in the drive circuit 4, so that the resonance point detection circuit 15 is used. Since it can be separately reduced, there is an effect that the cost can be further reduced. Otherwise, substantially the same effects as in the first embodiment can be obtained.

FIG. 12 shows a configuration of the starting means 24 in the sixth embodiment of the present invention. In this embodiment, the start means 24 is constituted by the button means 30.
The control circuit 9 and the like are supplied with power required for operation by turning on a power switch from a commercial power supply. Other configurations are the same as those of the first embodiment.

In this embodiment, after turning on the power switch, the user presses the button means 30 after completing the connection preparation, and the signal is transmitted to the control circuit 9 to start operations such as resonance point detection.

In the above-described embodiment, if the power switch is turned on in a state where the handpiece 3 is not connected to the apparatus main body 2, a notification that the connection state is not normal is given. In the example, when the connection or the like is terminated and the user wants to start the operation of resonance point detection, the user can operate the button means 30 to perform the operation.

In the present embodiment, in addition to the first and fifth embodiments, since the control is started by the user's intention without performing the control from the time of turning on the power, there is no careless control or notification to the user. .

In other words, according to the present embodiment, the operation can be started when it is desired to perform the resonance point detection. The other effects are the same as those of the first embodiment.

FIG. 13 shows the configuration of the starting means 24 in the seventh embodiment of the present invention. In this embodiment, the starting means 24 is constituted by an inverting circuit 31 for inverting and outputting an input signal. The output ON / OFF signal of the output SW 10 is input to the control circuit 9 and also to the inverting circuit 31 constituting the starting means 24.

In other words, while the output is not turned on by the output SW 10, the control start signal is transmitted to the control circuit 9, and the control by the above configuration may be started.

In the present embodiment, in addition to the sixth embodiment, since the resonance frequency is always swept while the output is not performed, the resonance frequency immediately before the output, the ultrasonic vibrator 16i of the handpiece 3I and the probe are always used. There is an effect that the state of 17i can be monitored.

FIG. 14 shows the configuration of the starting means 24 in the eighth embodiment of the present invention. In the present embodiment, the starting means 24 is constituted by a handpiece connection detecting means 32 for confirming the connection of the handpiece 3 (3A in FIG. 14). , And the control circuit 9 performs a control operation such as resonance point detection based on the handpiece connection detection signal.
That is, when the handpiece 3 is connected to the apparatus main body 2, the control with the above configuration is started. Others are the same as the first embodiment.

According to the present embodiment, when the operation of the resonance point detection is performed when the handpiece 3 is not connected, the notification of the error is performed. In this case, the operation of the resonance point detection is performed. Absent.

In this embodiment, since it is confirmed that the handpiece 3I is connected, it is a logic as to whether or not there is a resonance point as a criterion, and the program can be further simplified. The other effects are the same as those of the first embodiment.
In addition, an embodiment configured by partially combining the above-described embodiments and the like also belongs to the present invention.

[Appendix]
1. An ultrasonic oscillator driving oscillator for driving the ultrasonic oscillator,
Feedback means for feeding back a driving signal supplied to the ultrasonic transducer from the ultrasonic transducer driving oscillator,
By controlling the ultrasonic oscillator driving oscillator according to the feedback signal from the feedback unit from the feedback unit, the ultrasonic vibrator driving device to drive the ultrasonic oscillator at its resonance point,
Reference signal generating means for generating a reference signal whose frequency changes,
Signal switching means for switching the reference signal from the reference signal generating means and one of the two feedback signals to supply the reference signal to the phase comparator,
First drive starting means for starting driving of the reference signal generating means;
Resonance point detection means for detecting whether the drive frequency of the ultrasonic transducer is substantially equal to the resonance frequency of the ultrasonic transducer based on the feedback signal,
Frequency holding means for holding frequency information corresponding to a resonance point with a frequency from the reference signal generating means based on a detection result of the resonance point detecting means obtained by feedback from the reference generating means driven by the drive starting means. When,
A second drive start unit that drives the reference generation unit at a resonance frequency according to frequency information of the frequency storage unit;
An ultrasonic surgical apparatus, comprising: a notifying unit for notifying based on a result of the resonance point detecting unit.

1-1. 2. The ultrasonic surgical apparatus according to claim 1, wherein the reference signal generating means for generating the reference signal whose frequency changes is a voltage controlled oscillator.
1-2. 2. The ultrasonic surgical apparatus according to claim 1, wherein the control means for changing the frequency of the reference signal generating means comprises a microprocessor means and a digital-to-analog converting means.
1-3. Control means for changing the frequency of the reference signal generating means, opening and closing means for opening and closing the variable voltage means and the frequency storage means,
2. The ultrasonic surgical apparatus according to claim 1, further comprising switching means for switching between the variable voltage means and the frequency storage means by means of a second drive start means. 1-4. 2. The ultrasonic surgical apparatus according to claim 1, wherein the frequency storage unit that holds the frequency information corresponding to the resonance point is a digital-to-analog conversion unit.

1-5. 2. The ultrasonic surgical apparatus according to claim 1, wherein the frequency storage unit that stores the frequency information corresponding to the resonance point is a memory unit.
1-6. 2. The ultrasonic surgical apparatus according to claim 1, wherein the frequency storage unit that stores the frequency information corresponding to the resonance point is a voltage storage unit.
1-7. 2. The ultrasonic surgical apparatus according to claim 1, wherein the reference signal generating means for generating the reference signal whose frequency changes is a digital synthesizer means.

1-8. 2. The ultrasonic surgical apparatus according to claim 1, wherein the first drive start means is a SW means that can be turned on / off by a user operation.
1-9. 2. The ultrasonic surgical apparatus according to claim 1, wherein the first drive start means is logic means for assuming a result obtained by inverting a logic for driving by the second drive start means.
1-10. 2. The ultrasonic surgical apparatus according to claim 1, wherein the first drive start means is connection determination means for determining whether connection with the ultrasonic transducer to be driven is appropriate.

2. In an ultrasonic surgical apparatus in which a plurality of different ultrasonic surgical instruments are detachably connected,
Reference signal generating means capable of supplying a reference signal having a variable frequency to the ultrasonic surgical instrument,
Based on the reference signal supplied to the ultrasonic surgical instrument, a resonance point detection circuit that detects a resonance frequency of the ultrasonic surgical instrument,
Determining means for determining whether the connected ultrasonic surgical instrument is in a usable state from the detection result detected by the resonance point detection circuit,
When the resonance point detection circuit detects a resonance frequency, storage means for storing the resonance frequency information,
An ultrasonic surgical apparatus, comprising:

2-1. The ultrasonic surgical apparatus according to claim 2, further comprising a drive circuit that drives the ultrasonic surgical instrument based on the resonance frequency information stored in the storage unit.
2-2. The ultrasonic surgical apparatus according to claim 2, further comprising: resonance point information notifying means for notifying the resonance point information based on a detection result of the resonance point detection circuit.

2-3. 3. The ultrasonic surgical apparatus according to claim 2, wherein the reference signal generating unit is a voltage-controlled oscillating unit whose oscillation frequency changes with an applied voltage.
2-4. 3. The ultrasonic operation according to claim 2, wherein, when the resonance frequency is detected when the frequency oscillated by the reference signal generation unit is changed, information corresponding to the resonance frequency is stored in the storage unit. apparatus.
2-5. 3. The ultrasonic surgical apparatus according to claim 2, wherein the storage unit is a memory unit.

2-6. 3. The ultrasonic surgical apparatus according to claim 2, wherein the storage unit is a voltage holding unit. 2-7. 3. The ultrasonic surgical apparatus according to claim 2, wherein the reference signal generating unit is a digital synthesizer unit.
2-8. 3. The ultrasonic surgical apparatus according to claim 2, further comprising a first drive start unit that starts operation of the determination unit and the like.
2-9. The ultrasonic surgical apparatus according to Supplementary Note 2-8, wherein the first drive start unit is a power switch that supplies operation power to a determination unit or the like or a SW unit that can be turned on / off by a user operation.

2-10. 3. The apparatus according to claim 2, further comprising a second drive start unit that generates the reference signal generation unit based on the resonance frequency information stored in the storage unit and applies a drive signal of the resonance frequency to the ultrasonic surgical instrument. Ultrasound surgery device.
2-11. The ultrasonic surgical apparatus according to Supplementary Note 2-2, wherein the resonance point information notifying means visually or audibly notifies when the determining means determines that the ultrasonic surgical instrument is not in a usable state.
2-12. 3. The ultrasonic operation according to claim 2, wherein the ultrasonic instrument includes an ultrasonic oscillator that generates ultrasonic vibration, and a handpiece including a probe that transmits the ultrasonic vibration from the ultrasonic oscillator to a treatment unit. apparatus.

FIG. 1 is a block diagram showing the overall configuration of an ultrasonic operation apparatus according to a first embodiment of the present invention. FIG. 3 is a block diagram showing a configuration of a start unit. FIG. 2 is a block diagram illustrating a configuration of a control circuit and the like. The flowchart figure which shows the operation content. FIG. 9 is a diagram showing characteristics for operation explanation, detection signals, and the like. FIG. 9 is a block diagram illustrating a configuration around a control circuit according to a second embodiment of the present invention. FIG. 9 is a block diagram illustrating a configuration around a control circuit according to a third embodiment of the present invention. FIG. 13 is a block diagram illustrating a configuration around a control circuit according to a fourth embodiment of the present invention. FIG. 3 is a diagram illustrating a configuration of a resonance point detection circuit. FIG. 6 is a diagram showing characteristics for operation explanation, detection signals, and the like. FIG. 13 is a block diagram showing the overall configuration of an ultrasonic operation apparatus according to a fifth embodiment of the present invention. FIG. 14 is a diagram illustrating a configuration of a starting unit according to a sixth embodiment of the present invention. The figure which shows the structure of the starting means in Example 7 of this invention. The figure which shows the structure of the starting means in Example 8 of this invention. FIG. 2 is a block diagram showing a configuration of a first conventional example. FIG. 9 is a block diagram showing a configuration of a second conventional example.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 ... Ultrasonic surgical device 2 ... Device main body 3 ... Handpiece 4 ... Drive circuit 5 ... Amplifier 6 ... Detection circuit 7 ... Reference oscillator 7a ... VCO
7b ... DDS
8 Switching means 9 Control circuit 10 Output SW
11: phase comparator 12: low-pass filter 13: VCO
15 Resonant point detection circuit 21 Frequency storage means 21a RAM
22 display circuit 23 sound source circuit 24 starting means 16a, 16b ultrasonic vibrator 17a, 17b probe 28 CPU
29: D / A converter 30: Button means Attorney Susumu Ito

Claims (2)

A handpiece having an ultrasonic vibrator capable of generating ultrasonic vibration,
A digital synthesizer capable of oscillating a signal for driving the ultrasonic transducer,
Frequency sweeping means for outputting digital data whose data changes every moment to the digital synthesizer, and frequency sweeping the signal.
A resonance frequency detection circuit that detects a resonance frequency of the handpiece based on a signal that is frequency-swept by the frequency sweeping unit and supplied from the digital synthesizer to the ultrasonic vibrator;
When the resonance frequency detection circuit detects a resonance frequency, storage means for storing the resonance frequency information,
An ultrasonic surgical apparatus, comprising: 2. The ultrasonic surgical apparatus according to claim 1, further comprising a start unit having a button for instructing the resonance frequency detection circuit to start an operation.

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