JP2601902B2 - Ultrasonic drive - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic therapy apparatus that breaks a calculus or removes a tumor by, for example, driving an ultrasonic vibrator at its resonance point.

[Related Art] In recent years, an ultrasonic treatment apparatus that performs various treatments using an ultrasonic transducer, such as destruction of a calculus or excision of a tumor, has been put to practical use.

In this type of ultrasonic treatment apparatus, the ultrasonic transducer is driven at its resonance point in order to perform treatment efficiently. In other words, the PLL is used to drive the ultrasonic vibrator.
The resonance point is tracked by controlling the oscillation frequency so that the phase difference between the voltage applied to the ultrasonic vibrator and the flowing current becomes zero using (phase locked loop).

By the way, the equivalent circuit of the ultrasonic vibrator is generally the fifth type.
As shown in the figure, a coil L, a capacitor C, and a resistor R
Are connected in series to a series resonance circuit in which a braking capacitor (braking capacitive component) Cd is connected in parallel.
When a voltage is applied to the ultrasonic vibrator, the current id in the damping capacitor Cd is also flows current i ₁ is each of the series resonant circuit. It said current id, of i _1, is only current i ₁ being converted into ultrasonic vibration. Therefore, driving at the resonance point (mechanical resonance point) of the series resonance circuit is the most efficient.

However, the ultrasonic transducer includes the braking capacitor Cd as described above. Therefore, it cannot be driven at the most efficient mechanical resonance point. That is, as shown in FIG.
Lock point PR by PLL due to the capacitance susceptance ωCd of
And the mechanical resonance point ft was deviated.

In order to solve the above-mentioned drawbacks, there has been proposed, for example, a driving device disclosed in Japanese Utility Model Laid-Open No. 54-136943. In this drive device, an inductor (inductive component) Ld is connected in parallel with the ultrasonic transducer S as shown in FIG. According to this drive device,
As shown in FIG. 8, the capacitance susceptance ωCd of the braking capacitor Cd of the ultrasonic transducer S can be offset by the inductive reactance ωLd of the inductor Ld. As a result,
The lock point PR by the PLL coincides with the mechanical resonance point ft. Thus, driving at the mechanical resonance point by the driving circuit D is possible.

On the other hand, the ultrasonic vibrators have different capacitance susceptances of the braking capacitors depending on the shape, the characteristics of the electrostrictive element, and the like. For this reason, when the above-described driving device is used in an ultrasonic therapy apparatus that uses a variety of ultrasonic transducers connected to each other, the capacitance susceptances of the braking capacitors for all the ultrasonic transducers must be offset. Can not. That is, in a driving device including only one kind of inductor, the capacitance susceptances of various braking capacitors having different sizes cannot be completely canceled. Therefore, it was not possible to drive various types of ultrasonic transducers at their respective mechanical resonance points, resulting in an inefficient ultrasonic therapy apparatus.

[Problems to be Solved by the Invention] As described above, in the conventional ultrasonic therapy apparatus,
Since various types of ultrasonic transducers cannot be driven at their mechanical resonance points, there is a disadvantage that efficiency is poor.

Therefore, according to the present invention, even when the magnitude of the capacitance susceptance of the damping capacitive component differs depending on the type of the ultrasonic vibrator, the ultrasonic vibrator can always be reliably driven at its mechanical resonance point. It is an object of the present invention to provide an ultrasonic treatment device capable of performing treatment efficiently.

[Means for Solving the Problems] In order to achieve the above object, in an ultrasonic therapy apparatus according to the present invention, a drive circuit for generating a drive signal for driving an ultrasonic transducer, and A pair of signal lines to be transmitted, an inductor connected between the pair of signal lines, and at least one intermediate tap provided between the pair of connection terminals connected to the signal line and the inductor were obtained. A connector, and an ultrasonic drive main body, each having an ultrasonic oscillator having a different damping capacitive component and at least one pair of connection terminals connected to the ultrasonic oscillator and a connection terminal and an intermediate tap of the connector. And a plurality of ultrasonic probes selectively connected to the ultrasonic drive main body, the connectors having terminals having different connections corresponding to the braking capacities. And an ultrasonic transducer having different damping capacitive components, a pair of connection terminals connected to the ultrasonic transducer, and connection members each having a different shape corresponding to the braking capacity. A plurality of ultrasonic probes having connection means,
The ultrasonic probe is selectively connected, a pair of connection terminals to which a pair of connection terminals of the ultrasonic probe are connected, a drive circuit for generating a drive signal for driving the ultrasonic transducer, and the drive signal A pair of signal lines to be transmitted to the connection terminals, an inductor connected between the pair of signal lines, and inductance changing means for changing the inductance of the inductor in accordance with the connection of the connection member of the ultrasonic probe. An ultrasonic drive main body.

[Operation] According to the present invention, the inductance between the pair of signal lines is changed according to the magnitude of the damping capacitive component of the ultrasonic transducer connected to the pair of connection terminals by the above-described means. Regardless of the type of the ultrasonic transducer, the capacitive susceptance of the braking capacitive component can be surely canceled.

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

FIG. 1 schematically shows a configuration of a main part of a first embodiment of the present invention. That is, for example, one of the handpieces (probes) 3a and 3b is connected to the main body 1 of the ultrasonic therapy apparatus via the connector.

The handpiece 3a is provided with an ultrasonic transducer 4a having a braking capacitor (braking capacitive component) Ca.
The handpiece 3a is connected to the main body 1 through, for example, pins 5a, 5b, and 5d among the pins 5a to 5d of the connector.

The handpiece 3b is provided with an ultrasonic transducer 4b having a braking capacitor (braking capacitive component) Cb.
The handpiece 3b is connected to the main body 1 through, for example, pins 5a, 5c, and 5d among the pins 5a to 5d of the connector.

On the other hand, a drive circuit (drive means) 2 is provided inside the main body 1 of the ultrasonic therapy apparatus. This drive circuit 2
It is connected to pins 5a and 5d of the connector. Drive circuit 2
Drives the ultrasonic vibrators 4a and 4b of the handpieces 3a and 3b connected to the main body 1 at mechanical resonance points, respectively.

An inductor (inductive component) L is provided inside the main body 1. The inductor L is connected between the pins 5a and 5d of the connector, and
When the handpieces 3a, 3b are connected to the ultrasonic vibrators 4a, 4b, they are connected in parallel.

The inductor L has a capacitance susceptance of the braking capacitor Ca of the ultrasonic vibrator 4a and an ultrasonic vibrator 4b.
This is for canceling the capacitance susceptance of the braking capacitor Cb included in each of them. That is, the inductor L is provided with, for example, first and second intermediate taps. The first intermediate tap is connected to pin 5b of the connector, and the second intermediate tap is connected to pin 5c of the connector. Therefore, when the handpiece 3a is connected to the main body 1, by a pin 5b of the connector and a portion inductor L ₁ according to the first intermediate tap ultrasonic transducer
4a is connected in parallel. When the handpiece 3b is connected, the pin 5c of the connector causes the partial inductor L ₂ by the second intermediate tap.
And the ultrasonic transducer 4b are connected in parallel.

Here, the inductance in the partial inductor L ₁ according to the first intermediate tap is equal to the magnitude of the capacitance susceptance of damping capacitor Ca of the ultrasonic transducer 4a in the handpiece 3a has. Further, the inductance in the partial inductor L ₂ of the second intermediate tap is equal to the magnitude of the capacitance susceptance of damping capacitor Cb to the ultrasonic transducer 4b of the handpiece 3b has. Accordingly, regardless of which of the handpieces 3a and 3b is connected to the main body 1, the respective ultrasonic vibrators 4a and 4b
Can completely cancel the capacitance susceptance of the braking capacitors Ca and Cb.

In such a configuration, the handpiece 3a is now attached to the main body 1.
Is connected. In this case, connector pins 5a and 5d
The ultrasonic vibrator 4a and the drive circuit 2 are connected via the. Further, through the pin 5b of the connector, said a partial inductor L ₁ by the ultrasonic vibrators 4a and the first intermediate tap is connected in parallel.

Then, the inductance of the inductor L is changed in accordance with the magnitude of the capacitance susceptance of the braking capacitor Ca of the ultrasonic transducer 4a. That is, the size equal inductance capacitance susceptance of damping capacitor Ca of the ultrasonic transducer 4a has is obtained from the partial inductor L ₁ according to the first intermediate tap. Thus, the capacity susceptance of damping capacitor Ca of the ultrasonic transducer 4a has the inductance is changed according to the magnitude of the capacitance susceptance, i.e. complete the inductance in response to the partial inductor L ₁ according to the first intermediate tap Offset by

As described above, when the handpiece 3a is connected to the main body 1, the capacitance susceptance of the braking capacitor Ca of the ultrasonic vibrator 4a is surely offset.
As a result, the ultrasonic vibrator 4a of the handpiece 3a can be reliably driven at its mechanical resonance point. Therefore,
The treatment with the handpiece 3a, for example, calculus destruction and tumor excision can be efficiently performed.

On the other hand, when different types of ultrasonic vibrators are connected to the main body 1, that is, when the handpiece 3b is connected to the main body 1, the capacitance susceptance of the braking capacitor Cb of the ultrasonic vibrator 4b is reduced. The inductance of inductor L is changed accordingly. In this case, the capacity susceptance of the damping capacitor Cb will be completely offset by the inductance in response to the partial inductor L ₂ of the second intermediate tap. As a result, the ultrasonic vibrator 4b of the handpiece 3b can be reliably driven at its mechanical resonance point. As described above, even when the type of the ultrasonic transducer is different, various treatments can be efficiently performed.

As described above, the inductance of the inductor is changed by changing the wiring of the connector according to the difference in the magnitude of the capacitance susceptance of the braking capacitor included in the ultrasonic transducer. That is, according to the connection of the handpiece, the magnitude of the inductance of the inductor is changed to a value corresponding to the magnitude of the capacitance acceptance of the braking capacitor of the ultrasonic transducer. Thereby, the magnitude of the capacitance susceptance of the braking capacitor of the ultrasonic vibrator of the handpiece connected to the main body is different, that is, even if the type of the ultrasonic vibrator is different, it is possible to completely cancel the capacitance susceptance. Become. Therefore, the driving device in which one kind of inductor is connected in parallel with the ultrasonic vibrator can surely drive various kinds of ultrasonic vibrators at their respective mechanical resonance points. Therefore, it is possible to improve the driving efficiency of the ultrasonic treatment apparatus, and to efficiently perform various treatments.

FIG. 2 shows that the inductance in each of the partial coils L ₁ , L ₂ , L ₄ , L ₈ , L ₁₆ when the intermediate tap is provided in the inductor (inductive component) L in the first embodiment. , Respectively, are changed to 1L, 2L, 4L, 8L, and 16L.

In the second embodiment, when either one of the handpieces 13a and 13b is connected to the main body 11 of the ultrasonic treatment apparatus including the drive circuit 12, the respective ultrasonic transducers 14a and 14b are connected.
The inductance of the inductor L can be adjusted in units of 1 L according to the magnitude of the capacitance susceptance of the braking capacitor (braking capacitive component) of b. That is, the inductance of the inductor L is
The connection of the pins 15a, ..., 15g is changed in accordance with the magnitude of the capacitance susceptance of the braking capacitors of the ultrasonic transducers 14a, 14b of the respective handpieces 13a, 13b. As an example, the handpiece 13a has an inductance of 21L (16L + 4L + 1L)
Is shown. Also, the handpiece 13b is
The case where the inductance is set to 14L (8L + 4L + 2L) is shown.

According to such a configuration, the magnitude of the capacitance susceptance of the braking capacitor of the ultrasonic transducer of the connected hand piece is different, that is, even if the type of the ultrasonic transducer is different, 1 L unit of the inductance of the inductor is used. Each change ensures that the capacitance susceptance of the various braking capacitors can be offset. In particular, an almost continuous adjustment of the inductance of the inductor is possible. Therefore, even when a new ultrasonic transducer is manufactured, the capacitance susceptance of the braking capacitor can be surely canceled.

FIG. 3 schematically shows a configuration of a main part of a third embodiment of the present invention.

In the third embodiment, an inductor (inductive component) L in the main body 21 of the ultrasonic therapy apparatus is provided as in the first and second embodiments. This inductor L
Has a ferrite core 28 passed therethrough. The ferrite core 28 is movably supported by the spring 27 inside the inductor L.

On the other hand, the handpieces 23a and 23b connected to the main body 21 are provided with bars 29a and 29b having predetermined lengths in the connectors 25 and 25, respectively.

In the case of this embodiment, the handpieces 23a, 23
When either one of b is connected, the position of the ferrite core 28 is moved by the bar 29a or 29b. Then, the inductance of the inductor L is changed according to the amount of movement. That is, the length of the bars 29a, 29b is a length corresponding to the magnitude of the capacitance susceptance of the braking capacitors (braking capacitive components) of the respective ultrasonic transducers 24a, 24b, that is, the length of the bars from the inductor L to the capacitance susceptance. The above ferrite core
28 are long and can be moved.

Thus, when the handpiece 23a is connected to the main body 1, the drive circuit 22 and the ultrasonic vibrator 24a are connected via the connector pins 26a and 26b. The inductor L is connected in parallel with the ultrasonic transducer 24a. Further, at the time of this connection, the ferrite core 28 is moved to a predetermined position by the bar 29a provided on the connector 25 on the handpiece 23a side. Then, the inductance of the inductor L is changed according to the amount of movement of the ferrite core 28. Due to this changed inductance, the ultrasonic vibrator 24
The capacitance susceptance of the braking capacitor included in a is offset.

When the handpiece 23b is connected to the main body 1, the ferrite core 28 is moved by the bar 29b of the handpiece 23b during the connection. Then, the capacitance susceptance of the braking capacitor of the ultrasonic vibrator 24b is canceled by the inductance of the inductor L changed according to the amount of movement of the ferrite core 28.

Even with such a configuration, various ultrasonic vibrators 24a and 24 having different capacitance susceptances of the braking capacitors can be used.
b can be reliably driven at each mechanical resonance point. Therefore, various treatments by the ultrasonic treatment device can be efficiently performed.

In each of the first to third embodiments, the inductor has been described as an example of the inductive component.
It is not limited to this. Further, the braking capacitor has been described as an example of the braking capacitive component. However, for example, a distributed capacitance or another capacitive element may be used.

Of course, various modifications can be made without departing from the scope of the present invention.

[Effects of the Invention] As described above in detail, according to the present invention, even when the magnitude of the capacitance susceptance of the damping capacitive component differs depending on the type of the ultrasonic vibrator, the ultrasonic vibrator always has its mechanical resonance. Thus, it is possible to provide an ultrasonic treatment apparatus that can be driven reliably at a point and that can perform treatment efficiently.

[Brief description of the drawings]

FIGS. 1 to 3 each show an embodiment of the present invention. FIG. 1 is a configuration diagram schematically showing a main part of the first embodiment of the ultrasonic therapy apparatus, and FIG. FIG. 3 is a block diagram schematically showing a main part of the second embodiment, FIG. 3 is a block diagram schematically showing a main part of the third embodiment, and FIGS. FIG. 5 is a diagram showing the admittance of the ultrasonic transducer in FIG. 4,
FIG. 6 is a block diagram showing an example of a driving device of the ultrasonic transducer in FIG. 4, and FIG. 7 is a view showing admittance of the ultrasonic transducer in FIG. 1,11,21 ... Ultrasonic treatment device body, 2,12,22 ... Drive circuit, 3a, 3b, 13a, 13b, 23a, 23b ... Hand piece, 4a, 4b, 1
4a, 14b, 24a, 24b, S: ultrasonic transducer, Ca, Cb, Cd: braking capacitor, L, Ld: inductor.

Claims (3)

(57) [Claims] A driving circuit for generating a driving signal for driving the ultrasonic transducer; a pair of signal lines transmitting the driving signal;
Ultrasonic drive comprising: an inductor connected between the pair of signal lines; and a connector including a pair of connection terminals connected to the signal line and at least one intermediate tap provided between the inductors. The main body, the ultrasonic vibrator each having a different damping capacitive component and at least one pair of connection terminals are connected to the ultrasonic vibrator, and the connection between the connection terminal of the connector and the intermediate tap corresponds to the braking capacitance. And a plurality of ultrasonic probes selectively connected to the ultrasonic drive main body and having a connector having terminals connected differently from each other. 2. An intermediate tap according to claim 1, wherein the inductance of one signal line between the adjacent intermediate tap and a connection portion with a signal line is twice as large as the inductance of the other signal line. The ultrasonic therapy apparatus according to claim 1. 3. An ultrasonic vibrator having different damping capacitive components, a pair of connection terminals connected to the ultrasonic vibrator, and connecting members having different shapes corresponding to the braking capacitances. A plurality of ultrasonic probes having a connecting means, and a pair of connecting terminals to which the ultrasonic probe is selectively connected and a pair of connecting terminals of the ultrasonic probe are connected, and the ultrasonic transducer is driven. A drive circuit that generates a drive signal and a pair of signal lines that transmit the drive signal to the pair of connection terminals, and a connection between an inductor connected between the pair of signal lines and a connection member of the ultrasonic probe. An ultrasonic treatment apparatus comprising: an ultrasonic drive main body having inductance changing means for changing the inductance of the inductor.