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DESCRIPTION JP2001346805

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DESCRIPTION JP2001346805
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic surgical apparatus for performing surgery by ultrasonic waves.
[0002]
2. Description of the Related Art As prior art of an ultrasonic surgery apparatus for performing
surgery by ultrasonic waves, there are JP-A-2-265681, JP-A-7-313937 and JP-A-11-078334. In
JP-A-2-265681, the ultrasonic transducer is driven by variable frequency means, and it is judged
by the resonance point detection means whether the feedback signal is near the resonance
frequency, and the feedback signal and variable frequency means are outputted. And to the
actual output of switching to PLL control.
[0003]
In Japanese Patent Application Laid-Open No. 7-313937, a configuration different from the
above has a monitoring means for monitoring whether the frequency being driven is within a
predetermined frequency range. As a result of the monitoring means, the output is stopped when
it is determined that it is out of the range.
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1
[0004]
In Japanese Patent Application No. 11-078334, an arrangement different from the above is that
the variable oscillation means changes the frequency of an ultrasonic transducer having a
different resonance frequency and drives in advance, and resonance inspection is performed
from the current and voltage information generated at that time The resonant frequency is
detected by the output circuit. At the time of actual output, the drive is started from the abovementioned resonance frequency.
[0005]
FIG. 6 shows a prior art example similar to Japanese Patent Application No. 11-078334. The
ultrasonic surgical apparatus 1 ′ ′ comprises an apparatus body 2 ′ ′ and a handpiece 3 as
an ultrasonic surgical instrument detachably connected to the apparatus body 2 ′ ′. The
handpiece 3 is supplied from the apparatus body 2 ′ ′ Ultrasonic transducers for converting
ultrasonic energy into ultrasonic mechanical signals.
[0006]
That is, the handpiece 3 has various shapes as indicated by reference numerals 3A, 3B, and 3C,
and the ultrasonic transducers 16a, 16b, and 16c built in according to the shapes have respective
resonance frequencies. In addition, the resonance frequency also differs depending on the length,
thickness, and the like of the probes 17a, 17b, and 17c.
[0007]
The drive circuit 4 constituting the apparatus body 2 ′ ′ generates a signal for generating
ultrasonic energy. An amplifier 5 is connected to the drive circuit 4. The amplifier 5 amplifies the
power of the ultrasonic energy signal generated by the drive circuit 4. A detection circuit 6 is
connected to the amplifier 5.
[0008]
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2
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,...).
Detect the impedance | Z |. At that time, the detected voltage phase signal θv is transmitted to
the drive circuit 4.
[0009]
The detection circuit 6 is also connected to the handpiece 3I to supply ultrasonic energy to the
handpiece 3I. Further, a reference oscillator 7 is provided in the device body 2 ′ ′, and the
reference oscillator 7 is an oscillator that oscillates at an ultrasonic frequency that is first driven
by the drive circuit 4. The 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 in the switching means 8.
[0010]
Further, a signal of the reference frequency oscillated from the reference oscillator 7 is applied to
the contact point a in the switching means 8, and a signal of the reference frequency inputted
from the reference oscillator 7 is transmitted to the drive circuit 4 at the time of drive oscillation.
Can be switched to The control circuit 9 is connected to the switching control end of the
switching means 8. The 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.
[0011]
The drive circuit 4 includes a phase comparator 13 for phase comparison, a low pass filter 11 for
passing a low band signal component in the output signal of the phase comparator 13, and a
frequency according to the voltage of the low band signal component passed through the low
pass filter 11. It is comprised by VCO12 as a voltage control oscillator to oscillate.
[0012]
The voltage phase signal θv detected by the detection circuit 6 is input to one end of the phase
comparator 13, and the signal of the reference frequency input from the switching means 8 or
the current phase signal θi is input to the other end. It outputs a signal for setting the frequency
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3
to match the phase of the waveform.
[0013]
A low pass filter 11 is connected to the phase comparator 13.
The signal output from the phase comparator 13 is filtered to pass low frequency components to
generate a voltage necessary to match the voltage phase and the current phase.
The VCO 12 is connected to the low pass filter 11. The VCO 12 transmits to the amplifier 5 a
frequency at which the voltage phase and the current phase coincide with each other by the
voltage generated by the low pass filter 11, thereby realizing PLL control.
[0014]
Further, a resonance point detection circuit 15 is connected to the output terminal of the
detection circuit 6. Signals from the detection circuit 6, the low pass filter 11, and the control
circuit 9 are inputted to the resonance point detection circuit 15, and a circuit for determining
whether the voltage phase signal θv and the current phase signal θi coincide with each other is
formed. The details will be described later.
[0015]
Further, the control circuit 9 is connected to a frequency storage means 18 for storing a
frequency, a display circuit 19 as a notifying means, a sound source circuit 20, and a start means
14 for prompting the start of control. The start means 14 is connected to the handpiece 3I, and
when the start means 14 is turned on, a signal (actually power) of the operation start is inputted
to the control circuit 9 and also to the handpiece 3I.
[0016]
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4
In this prior art example, before the output SW 10 sends the output ON signal, that is, when the
control circuit 9 is permitted to start control by the start means 14, the reference oscillator 7
generates a handpiece 3I (I = A, B, C). The frequency near the resonance frequency of) is swept
from the high frequency of the resonance frequency to the low frequency or vice versa. At this
time, the resonance frequency is determined by the resonance point detection circuit 15. Then,
the detection result by the resonance point detection circuit 15 is transmitted to the control
circuit 9, and the resonance frequency data is stored in the frequency storage means 18.
[0017]
FIG. 7 shows a configuration example of the resonance point detection circuit 15. The resonance
point detection circuit 15 is configured by a comparison circuit 21. Further, the reference
oscillator 7 is configured by a VCO, and this VCO is configured with the same characteristics as
the VCO 12 constituting the drive circuit 4. When the start signal of start of frequency sweep is
input to the reference oscillator 7 by the control circuit 9, the frequency sweep of oscillation is
started by the reference oscillator 7.
[0018]
FIG. 8 shows input / output signals to the resonance point detection circuit 15. The control
circuit 9 receives a voltage a for frequency sweeping. Since the frequency output from the
reference oscillator 7 is low when the voltage a is low, the voltage output from the low pass filter
via the phase comparator 13 is output as high as the voltage b. That is, control works so that the
VCO 12 outputs at a high frequency. At this time, the voltage c (logic of binarization) output from
the comparison circuit 21 is “H”.
[0019]
As the control voltage a from the control circuit 9 gradually increases, the voltage b output from
the low pass filter 11 tends to drop, and as a result, there is a point where the voltage a and the
voltage b coincide. This indicates that the forcibly output frequency and the voltage (the
frequency being swept and oscillated) output from the low-pass filter 11 via the phase
comparator 13 coincide with each other. Means driving.
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[0020]
At this time, the voltage c output from the comparison circuit 21 transitions to logic "L". The
control circuit 9 stores the voltage a, which has been output at that time, from the voltage c on
the left in the frequency storage means 18, and outputs the voltage a stored at the time of
actually outputting the next time, thereby performing PLL control. It was possible to reduce the
time for migration.
[0021]
In the prior art shown in FIG. 9, the resonance point detection circuit 15 is configured by the
comparison circuit 21 and the reference voltage source 22. The input and output signals of the
comparison circuit 21 are shown in FIG. 10 and FIG.
[0022]
When an impedance signal is input from the detection circuit 6, the voltage e is obtained. When
the voltage input from the reference voltage source 22 to the comparison circuit 21 is the
voltage d, when the frequency is swept by the reference oscillator 7, the output voltage signal
becomes the voltage c and transmitted to the control circuit 9. Since the resonance frequency is
included in the frequency while the voltage c is in the logic "L", the frequency data at that time is
stored in the frequency storage means 18, and the voltage stored the next time actual output is
performed By outputting at a, it is possible to shorten the time for transition to PLL control.
[0023]
When the input signal is a current signal, the output result of the comparison circuit 21 becomes
voltage c by comparing the voltage f with the voltage d which is the reference voltage as shown
in FIG. Since the resonance frequency is included in the frequency while the voltage c is in the
logic "H", the frequency data at that time is stored in the storage means 18 to store the voltage a
at the next actual output. It is possible to shorten the time for transition to PLL control by
outputting the signal.
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[0024]
Furthermore, a modification of the resonance point detection circuit 15 is shown in FIG. In the
prior art, the resonance detection circuit 15 is configured by the comparison circuit 21 and the
peak hold circuit 23. The input and output signals of the comparison circuit 21 are shown in FIG.
The current signal input from the detection circuit 6 is a voltage f. Also, the voltage f changes like
the voltage g in the peak hold circuit 23.
[0025]
When the voltages input to the comparison circuit 21 are the voltage f and the voltage g, when
the frequency is swept by the reference oscillator 7, the output voltage signal becomes the
voltage c and transmitted to the control circuit 9. Since the frequency at the moment when the
voltage c becomes logic "L" is almost the resonance frequency, storing the frequency data at that
time in the frequency storage means 18 outputs the voltage a stored at the next actual output. By
doing this, it is possible to shorten the time for transition to PLL control.
[0026]
The impedance characteristics of the handpiece and the time to PLL control are described in FIG.
14 and FIG. Solid lines A and D are impedance characteristics at the start of use. The solid line B
and the solid line E are impedance characteristics in which the elements of the handpiece have
been heated up continuously when used continuously, and the frequency tends to be lowered as
a whole.
[0027]
A solid line C and a solid line F are impedance characteristics whose temperature has dropped as
the handpiece is cooled, and the frequency tends to rise as a whole. The solid lines A ′, B ′, C
′, D ′, E ′, F ′ indicate the time from the start of ultrasonic output to the resonance
frequency of the handpiece.
[0028]
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7
The ultrasonic transducer contained in the ultrasonic treatment tool and the ultrasonic probe
being fastened are in the direction of decreasing the resonance frequency due to heat generation
due to heat loss when converting ultrasonic electric energy into ultrasonic mechanical vibration
energy Minor change.
[0029]
As described above, the handpiece has a temperature characteristic due to the physical
composition of the transducer and probe contained therein, and the frequency tends to change.
As shown in FIG. 14, the resonance frequency is swept every time the ultrasonic wave is output.
Time for detecting and shifting to PLL control (actual output) is different.
If frequency sweeping is performed from a low frequency, it will take extra time if there is a
tendency of solid line C. Although not illustrated, it is needless to say that if frequency sweeping
is performed from a high frequency, it takes extra time if there is a tendency of the solid line A.
[0030]
Further, as shown in FIG. 15, the case where the frequency is swept in advance to detect the
frequency near the resonance frequency, and the result of the frequency is used to output the
ultrasonic wave is shown. Even in this case, although the time from the control step in FIG. 12 to
the resonance frequency of the handpiece decreases, the time until PLL control ends (actual
output) differs depending on the temperature characteristics of the handpiece, etc. It may take
time.
[0031]
SUMMARY OF THE INVENTION In the configuration of Japanese Patent Laid-Open No. 11078334, the resonance frequency of the vibrator is the lowest frequency or voltage of the drive
impedance obtained by sweeping the vibrator under constant current control. Since the
frequency at which the phase matches the current phase is stored in advance as a resonant
frequency, if the ultrasonic transducer or ultrasonic probe continues to be driven, a frequency
shift due to heat generation or the like will inevitably occur.
[0032]
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8
Although the above-mentioned frequency deviation can be solved by performing frequency
sweep again, since the steps described on the left are required, it takes time to actually set the
ultrasonic probe in a driveable state, and the response is degraded.
In the configurations of JP-A-7-313937 and JP-A-2-265681, the resonance frequency
information of the vibrator is not detected in advance before actual output, and in order to start
driving from an arbitrary frequency, the above frequency shift Becomes larger and control to PLL
transition becomes complicated, which leads to a decrease in response.
[0033]
SUMMARY OF THE INVENTION The present invention has been made in view of the above
problems, and it is an object of the present invention to provide an ultrasonic surgical apparatus
capable of shortening the time for actually driving an ultrasonic transducer and an ultrasonic
probe. .
[0034]
In an ultrasonic surgical apparatus to which a plurality of ultrasonic probes having different
resonance frequencies are detachably connected, a signal generating means capable of oscillating
by changing a frequency, and the signal generating means are provided. Amplifying means for
amplifying an output signal that can be supplied to the ultrasonic probe based on the generated
oscillation signal, and whether the phase of the voltage of the output signal supplied to the
ultrasonic probe through the amplifying means matches the phase of the current Phase
comparison means for detecting whether or not the phase of the voltage and the phase of the
current are detected to coincide with each other by the phase comparison means, and frequency
information of the oscillation signal generated by the signal generation means is stored. A
storage means; and control means for selecting the frequency information stored in the storage
means and controlling an oscillation frequency at which the signal generation means oscillates
based on the frequency information. And after storing frequency information of the oscillation
signal when the phase of the voltage of the output signal supplied to the ultrasonic probe is
changed by changing the frequency and the phase of the current in the storage means, the
frequency stored in the storage means Since information is selected and the signal generating
means is oscillated by this frequency information, it can be said that the ultrasonic probe can be
actually driven in a short time.
[0035]
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9
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
(First Embodiment) FIGS. 1 to 4 relate to a first embodiment of the present invention, and FIG. 1
shows an entire configuration of an ultrasonic surgical apparatus according to a first
embodiment of the present invention. 2 shows the configuration of the switching means, FIG. 3
shows a timing chart for explaining the operation, and FIG. 4 shows a partial configuration in the
modification.
As shown in FIG. 1, the ultrasonic surgical apparatus 1 according to the first embodiment of the
present invention is different from the ultrasonic surgical apparatus 1 ′ ′ of the conventional
example shown in FIG. Also, the output signal from the low pass filter 11 constituting the drive
circuit 4 is input to the switching means 24 having a configuration different from that of the
switching means 8 of FIG.
[0036]
Further, the device main body 2 is provided with a reset switch 25 for resetting, and an output
signal of the reset switch 25 is inputted to a reset detection circuit 26 for detecting reset. The
reset detection circuit 26 detects an input signal of the reset SW 25 and transmits the result to
the control circuit 9.
[0037]
The ultrasonic surgery apparatus 1 of the present embodiment will be described in more detail
as follows. The ultrasonic surgical apparatus 1 comprises an apparatus main body 2 and a
handpiece 3 as an ultrasonic surgical instrument detachably connected to the apparatus main
body 2, and ultrasonic energy supplied to the handpiece 3 from the apparatus main body 2
Contains an ultrasonic transducer for converting the ultrasonic wave into an ultrasonic
mechanical signal.
[0038]
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10
That is, the handpiece 3 has various shapes as indicated by reference numerals 3A, 3B, and 3C,
and the ultrasonic transducers 16a, 16b, and 16c built in according to the shapes have respective
resonance frequencies. Further, the resonance frequency also differs depending on the length,
thickness, etc. of the probes 17a, 17b, 17c.
[0039]
The drive circuit 4 constituting the apparatus body 2 generates a signal for generating ultrasonic
energy. An amplifier 5 is connected to the drive circuit 4. The amplifier 5 amplifies the power of
the ultrasonic energy signal generated by the drive circuit 4. A detection circuit 6 is connected to
the amplifier 5.
[0040]
The detection circuit 6 generates a voltage phase signal θv and a current phase from ultrasonic
energy amplified by the amplifier 5 when the handpiece 3I (I = A, B, C,...) Connected to the
apparatus main body 2 is driven. The signal θi is detected. At that time, the detected voltage
phase signal θv is transmitted to (the phase comparator 13 of) the drive circuit 4. Further, the
apparatus main body 2 is provided with a reference oscillator 7 capable of oscillating by
changing the frequency, and the reference oscillator 7 is an oscillator that oscillates at an
ultrasonic frequency to be driven first by the drive circuit 4.
[0041]
The reference oscillator 7 is connected to switching means 24 whose switching is controlled by
the control circuit 9, and can output an oscillation signal to the phase comparator 13 (of the
drive circuit 4) via the switching means 24. Further, it can be said that the reference oscillator 7
can be applied to the oscillation control terminal via the frequency control voltage from the
control circuit 9, the frequency control voltage stored in the frequency storage means 18 and the
switching means 24.
[0042]
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11
The control circuit 9 is connected to the output SW 10, and the output SW 10 transmits an ON /
OFF signal for driving the handpiece 3I to the control circuit 9. The drive circuit 4 includes a
phase comparator 13 for phase comparison, a low pass filter 11 for passing a low band signal
component in the output signal of the phase comparator 13, and a frequency according to the
voltage of the low band signal component passed through the low pass filter 11. It is comprised
by VCO12 as a voltage control oscillator to oscillate.
[0043]
The voltage phase signal θv detected by the detection circuit 6 is input to one end of the phase
comparator 13, and the signal of the reference frequency or the current phase signal θi input
via the switching means 24 is input to the other end, A signal for adjusting the frequency on the
VCO 12 side is output so that the phases of the two waveforms coincide.
[0044]
A low pass filter 11 is connected to the output end of the phase comparator 13.
A filter that passes low frequency components of the signal output from the phase comparator
13 is applied to generate a voltage necessary to match the voltage phase and the current phase.
The output end of the low pass filter 11 is connected to the input end of the VCO 12 (the input
end to which a voltage that determines the oscillation frequency is applied). The VCO 12
transmits to the amplifier 5 a frequency at which the voltage phase and the current phase
coincide with each other by the voltage generated by the low pass filter 11, thereby realizing PLL
control. The output end of the low pass filter 11 is connected to the switching means 24 so that
the output voltage can be stored in the frequency storage means 18 in the PLL control state.
[0045]
In the phase comparator 13, the phase shift (frequency shift) between the voltage phase signal
θv input from the detection circuit 6 and the signal input after the frequency is swept from the
reference oscillator 7 through the switching means 24 is the PLL pull-in. It is judged whether it is
within the possible range, and when it comes within the PLL pull-in possible range, the signal of
the judgment result is sent to the control circuit 9 to shift to the PLL control state to actually
drive the handpiece 3I.
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12
[0046]
The control circuit 9 is connected to the display circuit 19 and the sound source circuit 20 as
notification means.
Further, as described above, the device main body 2 is provided with the reset SW 25 for
resetting, and the output signal of the reset SW 25 is input to the reset detection circuit 26 for
detecting reset. The reset detection circuit 26 detects an input signal of the reset SW 25 and
transmits the result to the control circuit 9. The reset detection circuit 26 detects the connection
state of the handpiece 3I connected to the apparatus body 2 and transmits the result to the
control circuit 9.
[0047]
As shown in FIG. 2, the switching means 24 is constituted by relay means 27a, 27b, 27c. The
relay means 27a can switch the terminal a to which the current phase signal is input from the
detection circuit 6 and the terminal b to which the reference frequency is input from the
reference oscillator 7 by the control circuit 9 and output it to the phase control circuit 13 from
the common terminal c. I have to. The relay means 27b has an input terminal d to which a signal
from the low pass filter 11 is input, and a terminal e whose terminal d is controlled ON / OFF by
the control circuit 9, and the terminal e is connected to the terminal g of the relay means 27c.
The terminal g is connected to the frequency storage means 18.
[0048]
Further, in the relay means 27c, the terminal f to which the oscillation voltage from the control
circuit 9 is input and the terminal g to which the voltage stored in the frequency storage means
18 is input are conducted to the common terminal h by the control circuit 9. To be able to be
switched. The common terminal h is applied to the VCO 28 constituting the reference oscillator
7.
[0049]
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13
Further, the frequency storage means 18 is configured to include, for example, a hold capacitor
such as a sample hold circuit, and is configured by voltage holding means 29 that holds a voltage
value that determines the oscillation frequency at which the VCO 28 constituting the reference
oscillator 7 oscillates. ing. The other configuration is the same as that of FIG.
[0050]
In the present embodiment, when the power supply of the apparatus main body 2 is turned on
and the output SW 10 is turned on, the control circuit 9 makes relay means 27a, 27b, 27c
constituting the switching means 24 as shown in the timing chart of FIG. The frequency holding
means 18 holds frequency information (specifically, information of the oscillation control voltage
for the VCO 28) which determines the oscillation frequency of the VCO 12 when it is controlled
to shift to the PLL control state and shift to the PLL control state. If the output SW 10 is turned
on again after the output SW 10 is turned off once, the reference oscillator 7 is oscillated with
the last frequency information stored in the frequency storage means 18 to enable transition to
the PLL control state in a short time. ing.
[0051]
Next, the operation of the present embodiment will be described with reference to the time chart
of FIG. 3 showing the switching timing of the relay means 27a, 27b and 27c constituting the
switching means 24.
After the ultrasonic probe 3I is connected to the apparatus body 2 and the power is turned on, at
time t1, the output SW 10 is turned on to start ultrasonic output.
[0052]
At this time, the terminal conducting to the common terminal c of the relay means 27a is b, the
terminal conducting to the common terminal h of the relay means 27c is f, and the control circuit
9 controls the oscillation frequency to the VCO 28 (oscillation frequency Since the control
voltage is transmitted for sweeping, frequency sweeping (frequency sweeping of the oscillation
signal) is possible.
[0053]
The phase comparator 13 amplifies the oscillation output of the VCO 12 and receives the voltage
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14
signal θv in a state where the ultrasonic transducer 16i (i = a, b, c) of the handpiece 3I is driven
through the detection circuit 6 At the same time, the frequency swept oscillation output of the
VCO 28 constituting the reference oscillator 7 is input, the phases of these two signals are
compared, and it is judged whether or not the PLL can be shifted.
[0054]
Then, at time t2 by the frequency sweep of the VCO 28, the phase comparator 13 transmits the
judgment result that the PLL can be shifted to the control circuit 9.
That is, when the phase comparator 13 can shift to PLL, the determination result is transmitted
to the control circuit 9.
In response to the result, the control circuit 9 controls the common terminal c of the relay means
27a and the terminal to be turned on to switch from b to a, phase comparison with the current
signal detected from the detection circuit 6, and PLL control is started. Thus, the actual output of
ultrasonic waves is started.
[0055]
Then, an ultrasonic wave drive signal is output to the handpiece 3I (3A in FIG. 1) detachably
connected to the apparatus body 2, and an ultrasonic wave drive signal is applied to the
transducer 16i incorporated therein, and ultrasonic surgery is performed. Will be able to do.
[0056]
Since the relay means 27b is turned on by the control circuit 9 at time t3 when the PLL control
state is reached and a little time has elapsed, the frequency control voltage output from the low
pass filter 11 to the VCO 12 is also transmitted to the voltage holding means 29. , Hold its
frequency control voltage in real time.
The actual output of the ultrasonic wave starts, and the frequency control voltage for the VCO 12
in that state is held in real time by the voltage holding means 29, and after performing ultrasonic
surgery on the affected part etc., it is desired to stop the ultrasonic wave. Time t4 is reached.
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15
[0057]
At time t4, the output SW10 is turned off, the relay terminal of the relay means 27b returns to
the state of time t1, and the terminal electrically connected to the common terminal h of the
relay means 27c switches from f to g.
[0058]
Here, the voltage control means 29 holds the frequency control voltage transmitted from the low
pass filter 11 to the VCO 12 immediately before the output SW 10 is turned off.
The common terminal h and the ON terminal of the relay means 27c are switched from f to g,
and the voltage held by the voltage holding means 29 is connected to the VCO 28 so that it can
be transmitted as the frequency control voltage of the VCO 28. become.
[0059]
Then, at time t5, it is assumed that the output SW 10 is turned on and the ultrasonic wave output
is started again. Then, the VCO 28 oscillates the voltage held by the voltage holding means 29 as
a frequency control voltage. Therefore, the phase comparator 13 determines that the PLL shift is
possible at time t6 which is a very short time from time t5, and the determination result of the
PLL shift is possible is transmitted to the control circuit 9.
[0060]
At time t6, the same control as at time t2 is performed, and at time t7, the same control as at
time t3 is performed. Further, at time t8, the same control as that at time t4 is performed.
[0061]
The step temporally different between the step from time 1 to time t4 and the step from time t5
to time t8 is that the step from time t5 to time t6 is short.
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16
This is because the voltage holding means 29 holds the frequency control voltage for tracking as
the previous resonance frequency, so when output to the phase comparator 13 by the VCO 28, it
is determined that PLL control is possible at the immediate resonance frequency. Since the result
is transmitted to the control circuit 9, it is possible to shorten the time until the completion of a
series of control.
[0062]
That is, once the steps from time t1 to time t4 are finished, it means that the control is performed
at the steps of time t5 to time t8 in the subsequent actual output.
[0063]
That is, in the present embodiment, when the handpiece 3I connected to the apparatus main
body 2 is driven at the resonance frequency of the ultrasonic transducer 16i incorporated
therein, the PLL driving is initially performed at the resonance frequency. Although it takes time
to set, after that the frequency control voltage of the resonance frequency is held by the voltage
holding means 29 in real time, so once the output of the ultrasonic wave is stopped, the
ultrasonic wave output is performed again In such a case, the frequency control voltage held by
the voltage holding means 29 drives the reference oscillator 7 to shift to PLL (time to the
handpiece 3I), and the time to actual output can be made in a very short time.
[0064]
For this reason, when performing an ultrasonic operation by frequently turning on and off the
output SW 10, the operator immediately turns on the output SW 10, with almost no waiting
except in the first case. It is possible to provide an ultrasonic surgical apparatus 1 which can be
ultrasonically driven at the resonance frequency of the handpiece 3I, has a good response, and is
very convenient for the operator.
[0065]
In this case, if the ON and OFF of the output SW 10 is repeated and the accumulated time when
the output SW 10 is turned on becomes long, the ultrasonic transducer 16i may generate heat
and the resonance frequency may be gradually deviated. Since the frequency information
immediately before the last time it was turned off is always stored, it is driven again with that
frequency information when it is turned on next time (except when the time interval when
turning on from OFF is large) The change of the resonance frequency in the meantime becomes
small, and the transition to the PLL control state can be made in a short time.
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[0066]
That is, according to the present embodiment, since the frequency information in use is held in
substantially real time, when it is turned off and then turned on, the frequency information at the
time of the last OFF before that ON Since the oscillation is performed at time t1, even when the
usage time of the handpiece 3I is short, it becomes long as well as when the temperature rises,
actual driving can be performed in a short time, and operability (usability) can be improved.
[0067]
On the other hand, when the handpiece 3I is detached and attached again, the voltage
information stored in the voltage holding means 29 is considered to be different from the
resonance frequency of the detached and attached handpiece 3I.
At that time, the connection state of the handpiece 3I is detected by the reset detection circuit
26, and the signal is transmitted to the control circuit 9 when the result is that the one end is
also disconnected.
The control circuit 9 operates to control from the step from time t1 when there is signal
transmission from the reset detection circuit 26, so there is no problem even if a handpiece 3I of
a type having a different resonance frequency is connected.
Further, even when the user wants to reset the frequency information independently, since the
signal of the reset SW 25 is detected by the reset detection circuit 26, the same effect is obtained
by transmitting the same data as described above to the control circuit 9. It goes without saying
that
[0068]
FIG. 4 shows a partial configuration in a modification of the first embodiment.
In this modification, the control circuit 9 is constituted by a CPU 32 (central processing unit).
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18
Further, the frequency storage means 18 is constituted by the RAM 33, the D / A converter 34,
and the A / D converter 35, and the CPU 32, the RAM 33, the D / A converter 34 and the A / D
converter 35 are connected by a data bus. .
[0069]
Further, the analog output terminal of the D / A converter 34 and the analog input terminal of
the A / D converter 35 are connected to a voltage control input terminal for causing the VCO 28
of the reference oscillator 7 to oscillate. In this modification, at the timing of inputting the
frequency control voltage of the VCO 28 of the reference oscillator 7, the frequency control
voltage is detected in real time using the A / D converter 35. The result is stored as digital data in
the RAM 33 through the CPU 32 of the control circuit 9.
[0070]
This series of steps is performed at time t3 to time t4 or time t7 to time t8 described in FIG.
Then, in the step of directly driving the VCO 28 from the frequency storage means 18, that is, in
the steps of time t5 to time t6 described in FIG. 3, the data finally stored in the RAM 33 is
outputted from the D / A converter 34 via the CPU 32. Can be realized.
[0071]
Compared with the first embodiment, this modification stores and controls the voltage data for
frequency control of the VCO 28 as digital data, so that it is not influenced by the variations of
the elements or the temperature characteristics, and the accuracy is also improved. It can be
easily coped with.
[0072]
In the first embodiment, the frequency control voltage in real time is held by the voltage holding
means 29 after the output SW 10 is turned ON to shift to the PLL, but the present invention is
limited thereto. Instead, the frequency control voltage when the output SW 10 is turned off after
the output SW 10 is turned on may be held by the voltage holding means 29 (of the frequency
holding means 18).
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[0073]
Second Embodiment FIG. 5 shows the configuration of an ultrasonic surgical apparatus 1
'according to a second embodiment of the present invention.
In the ultrasonic surgical apparatus 1 shown in FIG. 1, the ultrasonic surgical apparatus 1 ′
shown in FIG. 5 is a variable oscillator whose oscillation frequency is variable with digital data
instead of the VCO 12 constituting the drive circuit 4. The oscillation output of the DDS 36 is
output to the amplifier 5, and the oscillation control terminal of the DDS 36 is connected to the
control circuit 9.
[0074]
Further, in the ultrasonic surgical apparatus 1 of FIG. 1, the reference oscillator 7 and the
switching means 24 are eliminated.
The voltage phase signal θv and the current phase signal θi output from the detection circuit 6
are input to the phase comparator 13. The output of the phase comparator 13 is input to the low
pass filter 11 and to the control circuit 9. Further, the frequency storage means 18 is constituted
by a RAM (random access memory) 37. The other configuration is the same as that of the first
embodiment.
[0075]
Next, the operation of the present embodiment will be described. First, before the output ON
signal of the output SW 10 is transmitted, the control circuit 9 operates as a variable oscillator to
sweep the handpiece 3 from a high frequency to a low frequency or its reverse frequency
transition to the DDS 32 Digital data is sent to
[0076]
The voltage phase signal θv and the current phase signal θi detected by the detection circuit 6
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are transmitted to the phase comparator 13 to detect a resonance frequency. In other words, a
signal is transmitted to the control circuit 9 when the phase relationship between the voltage
phase signal θv and the current phase signal θi matches.
[0077]
As described above, since the control circuit 9 performs frequency sweeping, when the signal
with the phase matching is transmitted from the phase comparator 13, the frequency digital data
for which the control circuit 9 controls the DDS 36 uses the frequency storage means 18. It is
transmitted to the configured RAM 37 and data is stored.
[0078]
At the time of actual output next time, it becomes possible to immediately shift to PLL control by
starting oscillation of DDS 36 using resonance frequency data stored in RAM 37, and the same
effect as the first embodiment is obtained. can get.
[0079]
The configurations of the reset detection circuit 26 and the reset SW 25 are the same as those of
the first embodiment, and when the reset signal is input to the control circuit 9, the frequency
sweep is performed without using the resonance frequency data of the RAM 37. Is possible.
[0080]
The effect of the present embodiment is that all frequency data is treated as digital data as I / F,
including the DDS 36 which is a variable oscillator, the RAM 37 which is a frequency storage
means, and the control circuit 9. It is not only excellent, but it is also configured to be able to add
arithmetic processing by the CPU, and it is highly extensible that can easily improve control flow
by improving software.
[0081]
In the above description, the information on the last frequency control voltage stored in the
frequency storage means 18 is used next when the output SW 10 is turned on again, but the time
when the output SW 10 is turned on or the output SW 10 again Measure the time interval to turn
on the signal to determine the length of that time, or detect the ultrasonic probe 3I (the
temperature of the ultrasonic transducer 16i built into it), and use the frequency control voltage
to be used next May be changed or switched.
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[0082]
That is, when the output SW 10 is turned on for a long time, the ultrasonic transducer 16i may
generate heat and the resonance frequency thereof may be changed more than in the case where
the heat generation is not generated.
[0083]
In such a case, when the output SW 10 is turned on again, if the temperature does not change
much, the resonance frequency in that case changes almost to that of the last frequency control
voltage information stored in the frequency storage means 18 Since it does not perform, as
described above, the transition to the PLL control state can be performed in a short time in a
short time.
[0084]
However, when a long time elapses until the output SW 10 is turned on again, the heat
generation changes to a moderated state, and in this case, when the output SW 10 is first turned
on to shift to the PLL control state, In some cases, the information of the stored first frequency
control voltage may be more appropriate.
[0085]
For this reason, when it takes a long time until the output SW 10 is turned on next, the
information of the first frequency control voltage stored in the frequency storage means 18 is
adopted, and the output SW 10 is turned on next If it does not take a long time, the information
on the last frequency control voltage stored in the frequency storage means 18 may be switched
(selected) to be adopted.
In addition, the temperature may be switched without measuring the time.
[0086]
In the conventional example shown in FIG. 6, the resonance frequency is detected by the absolute
value of the impedance when performing frequency sweep, and transition is made to PLL control,
but the absolute value of the impedance is large even if frequency sweep is performed by
constant current feedback Therefore, the desired current value may not flow.
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In such a case, frequency sweep is performed with constant current feedback, and if a current
value greater than or equal to a certain value is detected, it is determined that it is near the
resonance frequency, and switching to PLL control at that time stabilizes at the start of PLL
control. You may make it improve the nature.
Alternatively, frequency sweep may be performed by constant current feedback, and switching to
PLL control may be performed at a frequency at which the current peaks.
[0087]
[Supplementary Note] 1.
In an ultrasonic surgical apparatus to which a plurality of ultrasonic probes having different
resonance frequencies are detachably connected, an ultrasonic wave is generated based on an
oscillation signal generated by the signal generation means capable of oscillating by changing the
frequency and the oscillation signal generated by the signal generation means. Amplification
means for amplifying an output signal that can be supplied to a probe; phase comparison means
for detecting whether or not the phase of the voltage of the output signal supplied to the
ultrasonic probe through the amplification means matches the phase of the current; Storage
means for storing frequency information of an oscillation signal generated by the signal
generation means when it is detected by the phase comparison means that the phase of the
voltage and the phase of the current are in agreement; Control means for selecting the frequency
information being controlled and controlling the oscillation frequency at which the signal
generating means oscillates according to the frequency information. .
[0088]
2.
The oscillation signal of the signal generation means is amplified by the amplification means
based on the frequency information stored in the storage means, and is applied to the connected
ultrasonic probe. Ultrasonic surgery device.
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3.
The ultrasonic surgical operation apparatus according to claim 1, further comprising a
determination unit that determines whether to drive the signal generation unit based on the
frequency information stored in the storage unit.
[0089]
4.
In an ultrasonic surgical apparatus to which a plurality of different ultrasonic surgical
instruments are detachably connected, a reference signal generating means capable of supplying
a reference signal of varying frequency to the ultrasonic surgical instruments, the ultrasonic
surgery Comparator circuit for detecting the resonant frequency of the ultrasonic surgical
instrument from the phase of the voltage signal and current signal generated based on the
reference signal supplied to the medical instrument, and the phase comparator circuit at the
resonant frequency While driving, the storage means for storing the frequency control signal of
the reference signal generation means, and the selection means for selecting the frequency
control signal stored in the storage means are provided. Sonic surgery device.
[0090]
5. The ultrasonic surgical apparatus according to claim 4, further comprising a drive circuit for
driving the ultrasonic surgical instrument based on the resonance frequency information stored
in the storage means. 6. The ultrasonic surgical apparatus according to claim 4, further
comprising a determination unit that determines whether to drive the reference signal generation
unit based on the resonance frequency information stored in the storage unit.
[0091]
7−1. An ultrasonic transducer driving oscillator for driving an ultrasonic transducer, and
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feedback means for feeding back a drive signal supplied to the ultrasonic transducer by the
ultrasonic transducer driving transmitter, the feedback means An ultrasonic transducer driving
device that drives the ultrasonic transducer at its resonance frequency by controlling the
ultrasonic transducer driving oscillator according to a feedback signal from the reference signal,
and a reference signal whose frequency changes Switching between the first reference signal
generating means for generating the second reference signal from the second reference signal
generating means and the reference signal generating means for detecting the resonance
frequency by changing the frequency with one of the two feedback signals First signal switching
means for supplying the phase comparator and a signal input from the phase comparator to the
first driving oscillator is transmitted to the frequency storage circuit Second signal switching
means, a third signal switching means to be input from the frequency storage circuit to the
second drive oscillator, and frequency information stored in the frequency storage circuit when
driven by the drive start means. An ultrasonic surgical apparatus comprising: a second reference
generation means for oscillating at a resonance frequency; and a reset circuit for determining
whether to oscillate based on frequency information stored in a frequency storage circuit.
[0092]
7−2. 7. The ultrasonic surgical apparatus according to 7-1, wherein the first and second
reference signal generating means whose frequency changes are voltage controlled oscillating
means. 7−3. The ultrasonic surgery apparatus according to 7-1, wherein the frequency
storage means is a voltage storage means. 7−4. 7. The ultrasonic surgical apparatus
according to 7-1, wherein the frequency storage means is constituted by digital analog
conversion means, analog digital conversion means and memory means.
[0093]
7−5. The reset detection circuit for determining whether to switch the third signal switching
means is a handpiece connection detection circuit for detecting a connection state between the
ultrasonic transducer and the ultrasonic surgery apparatus. Ultrasonic surgery equipment.
7−6. 7. The ultrasonic surgical apparatus according to 7-1, wherein the reset detection
circuit performing determination to switch the third signal switching unit is a user-operable SW.
[0094]
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8−1. Reference signal generating means for generating a reference signal capable of
supplying a reference signal of varying frequency to the ultrasonic surgical instrument in an
ultrasonic surgical apparatus to which a plurality of different ultrasonic surgical instruments are
detachably connected A phase comparison unit for detecting a resonant frequency of the
ultrasonic surgical instrument based on the reference signal supplied to the ultrasonic surgical
instrument and a memory for storing resonant frequency information detected by the phase
comparator An ultrasonic surgical apparatus comprising: means and a reset detection circuit for
resetting resonance frequency information of the storage means.
[0095]
8−2. The ultrasonic surgery apparatus according to 8-1, comprising a drive circuit for
driving the ultrasonic surgical instrument based on the resonance frequency information stored
in the storage means. 8−3. The ultrasonic surgical apparatus according to 8-1, wherein the
reference signal generating means is a digital synthesizer means. 8−4. The ultrasonic
surgical apparatus according to 8-1, wherein the storage means is a memory means.
[0096]
8−5. The reset detection circuit for resetting the resonance frequency information stored in
the storage means is a handpiece connection detection circuit for detecting a connection state
between the ultrasonic transducer and the ultrasonic surgery apparatus. Ultrasonic surgery
apparatus as described. 8−6. The ultrasonic operation apparatus according to 8-1, wherein
the reset detection circuit for resetting the resonance frequency information stored in the storage
unit is a user-operable SW.
[0097]
As described above, according to the present invention, in an ultrasonic surgical apparatus in
which a plurality of ultrasonic probes having different resonance frequencies are detachably
connected, signal generation means capable of oscillating by changing the frequency. And
amplification means for amplifying into an output signal that can be supplied to the ultrasonic
probe based on the oscillation signal generated by the signal generation means, and phase and
current of voltage of the output signal supplied to the ultrasonic probe through the amplification
means Phase comparison means for detecting whether or not the phases of the two phases
coincide, and oscillation generated by the signal generation means when the phase comparison
means detects that the phases of the voltage and the phase of the current coincide with each
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other A storage unit for storing frequency information of a signal, and the frequency information
stored in the storage unit are selected to control an oscillation frequency at which the signal
generation unit oscillates according to the frequency information. Since the control means is
provided, after storing the frequency information of the oscillation signal when the phase of the
voltage of the output signal supplied to the ultrasonic probe is changed by changing the
frequency and the phase of the current in the storage means, Since the frequency information
stored in the storage means is selected and the signal generating means is oscillated by this
frequency information, the ultrasonic probe can be actually driven in a short time.
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