JPH03155854A - Ultrasonic medical treatment device - Google Patents

Abstract

PURPOSE:To obtain the ultrasonic medical treatment device which can match the impedance of an ultrasonic probe and a driving means in accordance with the kind of a vibration transfer member by providing an adjusting means for adjusting an induction component of a matching means from the result of the detection of a detecting means. CONSTITUTION:To an ultrasonic vibrator 3 of an ultrasonic probe 1, a secondary winding of a matching transformer 21 is connected, and to a primary winding, a resonance point detecting circuit 23 is connected, and when high frequency power from a driving circuit 22 is applied to the ultrasonic vibrator 3 of the ultrasonic probe 1 through the matching transformer 21, if a vibration transfer member 10a is installed in the ultrasonic probe 1, not only a driving resonance frequency fr but also a resonance point f1 of a screw part 11 appear. When the vibration transfer members 10b, 10c are installed, resonance points f2, f3 of the screw part 11 appear. Accordingly, by detecting the resonance points f1, f2 and f3 of the screw part 11 by the resonance point detecting circuit 23, and adjusting the reactance of the matching transformer 21, based on its signal, the impedance of the ultrasonic probe 1 and the driving circuit 22 can be matched in accordance with the kind of the vibration transfer member.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an ultrasonic treatment device used for crushing stones in a living body or emulsifying living tissue using ultrasonic vibrations. It is.

[Conventional technology]

Generally, this type of ultrasonic treatment device is composed of an ultrasonic probe having a vibration transmission member that transmits ultrasonic vibrations to a treatment area, and a drive circuit that drives this ultrasonic probe. It is attached to the tip of the horn with a screw so that it can be replaced with multiple types of vibration transmission members of different shapes and lengths depending on the purpose.

In such an ultrasonic treatment device, when the type of vibration transmission member changes, the impedance of the ultrasonic probe also changes, so it is necessary to match the impedance of the ultrasonic probe and the impedance of the drive circuit. For this reason, in the past, the impedance of the ultrasonic probe was detected, and an appropriate drive circuit was selected based on the detection result to perform impedance matching.

[Problem to be solved by the invention]

However, as the number of types of vibration transmission members increases, several types of vibration transmission members may exist within the same impedance range, and in such cases, it is difficult to accurately select an appropriate drive circuit for each vibration transmission member. It was difficult.

The present invention has been made in view of the above-mentioned problems, and its purpose is to adjust the impedance of the ultrasonic probe and the driving means for driving the ultrasonic probe to the type of the vibration transmission member even when there are a large number of vibration transmission members of different types. The aim is to provide an ultrasonic treatment device that can be adjusted accordingly.

[Means to solve the problem]

In order to solve the above problems, an ultrasonic treatment apparatus according to the present invention includes an ultrasonic probe having a vibration transmission member that transmits ultrasonic vibrations to a treatment site, a driving means for driving the ultrasonic probe, and a driving means for driving the ultrasonic probe. matching means for matching the impedance of the ultrasonic probe with the impedance of the ultrasonic probe;
a detecting means for detecting the type of the vibration transmitting member based on a difference in the length of a threaded portion provided at the rear end of the vibration transmitting member; and adjusting the induced component of the aligning means from the detection result of the detecting means. :Js adjustment means.

[Function] According to the above configuration, even if there are a large number of vibration transmission members of different types, the impedance of the ultrasonic probe and the impedance of the driving means can be matched according to the types of vibration transmission members, and the ultrasonic The probe can be driven efficiently.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is a sectional view showing the configuration of an ultrasonic probe of an ultrasonic treatment apparatus according to the present invention, and an ultrasonic transducer 3 is housed inside an exterior cover 2 of the ultrasonic probe 1. As shown in FIG.

This ultrasonic vibrator 3 is composed of a plurality of piezoelectric cords 4 made of PZT (lead zirconate titanate) or the like, and a plate-shaped electrode 5 sandwiched between these piezoelectric elements 4. A horn 6 and a backing material 7 made of metal or the like are arranged. The horn 6 and the backing material 7 are tightened by a nut 9 attached to a bolt 8 passing through the center thereof, thereby bringing the piezoelectric element 4 and the plate electrode 5 into close contact with each other. Note that the bolt 8 is screwed into the rear surface of the horn 6.

Further, a thin tube-shaped vibration transmission member 1 is provided at the tip of the horn 6.
0 are screwed together. There are several types of vibration transmission members 10 depending on the purpose of treatment (in the figure, vibration transmission members 10a and 10b of type 314 are used).

10c) are prepared, and the rear ends of these vibration transmitting members 10a, 10b, 10c each have a length fl.
7. f12. Threaded portions 11 having different fl* are provided.

In addition, a suction hole 12 is formed in the axial center of the horn 6 and the bolt 8, and the suction hole 12 communicates with the lumen of the vibration transmission member 10. It is connected to a suction device (not shown) via a suction hose attached to the cap 13.

Further, a power cord 14 is connected to the plate electrode 5, and when a high frequency voltage is applied to the plate electrode 5 from a drive circuit (described later) via the power cord 14, the piezoelectric element 4 vibrates and generates ultrasonic waves. It is designed to generate vibrations. The ultrasonic vibrations generated by the ultrasonic vibrator 3 are amplified by the horn 6 and transmitted to the vibration transmission member 10, which transmits the ultrasonic vibrations to the treatment area.

FIG. 2 is a diagram showing the configuration of a driving device that drives the ultrasonic probe 1 configured as described above, and the secondary winding of a matching transformer 21 is connected to the ultrasonic transducer 3 of the ultrasonic probe 1. has been done. This matching transformer 21 is connected to a drive circuit 22.
A resonance point detection circuit 23 is connected to the primary winding of the matching transformer 21. This resonance check outlet path 23 is the vibration transmitting member 10a, 10b.

It detects the resonance point of the threaded part 11 provided at the rear end of 10c, and the signal output from the resonance point detection circuit 23 is input to the relay drive circuit 24 that drives the relay 25. . The above relay 25 is a matching transformer 2
The switching contacts 25a, 25 of this relay 25 are for adjusting the inductive component (reactance) of the relay 25.
b, 25c are connected to intermediate taps provided on the primary winding of the matching transformer 21, respectively.

According to the above configuration, high frequency power from the drive circuit 22 is applied to the ultrasound transducer 3 of the ultrasound probe 1 via the matching transformer 21. Here, ultrasound probe 1
When the vibration transmission member 10a is installed in the ultrasonic probe 1, the ultrasonic probe 1 has an impedance characteristic as shown in FIG. 3a, and a resonance point f1 of the threaded portion 11 appears in addition to the driving resonance frequency fr. Moreover, when the vibration transmission members 10b and 10c are respectively attached to the ultrasound probe 1,
The ultrasonic probe 1 has impedance characteristics as shown in FIGS. 3B and 3C, and resonance points f, , f of the threaded portion 11 appear in addition to the drive resonance frequency fr.

Therefore, the resonance point of the threaded portion 11 fir "lrf,
is detected by the resonance point detection circuit 23, and based on the signal from the resonance point detection circuit 23, the relay 25 is driven to connect the matching transformer 2.
By adjusting the reactance of the ultrasonic probe 1, the impedance of the ultrasonic probe 1 and the impedance of the drive circuit 22 can be matched depending on the type of vibration transmission member.

In addition, in the above embodiment, the vibration transmission member 10a.

The type of vibration transmission member was detected by detecting the resonance points f, , f, , f of the threaded portions 11 provided at the rear ends of 10b and 10b, but as shown in FIG. The reflected wave from the probe 1 may be detected by the reflected wave detection circuit 26, and the type of vibration transmission member may be detected from the time shift of the reflected waves caused by the difference in length of the threaded portion 11.

Next, a third embodiment of the present invention is shown in FIGS. 5 and 6. Note that the same parts as shown in FIGS. 1 to 4 are given the same reference numerals, and only the parts that are different from the first and second embodiments described above will be described.

In this third embodiment, as shown in FIG. 5, a horn 6 to which vibration transmission members 10a, 10b, and 10c are screwed together
A cylindrical piezoelectric rubber 31 is provided in the screw hole 15 . This piezoelectric rubber 31 is connected to a detection circuit 33 shown in FIG. 6 through a No. TA cotton wire 32, and this detection circuit 33 detects the type of vibration transmission member.

That is, the vibration transmission member 10a is inserted into the screw hole 15 of the horn 6.
, 10b, 10c are screwed in, the piezoelectric rubber 31 is compressed by the threaded portion 11 provided at the rear end of the vibration transmission member 10a, 10b, 10c, and outputs a signal according to the length of the threaded portion 11. Therefore, by detecting this with the detection circuit 33, the type of the vibration transmission member can be detected, and similarly to the first and second embodiments described above, the reactance of the matching transformer 21 can be determined according to the type of the vibration transmission member. It can be set to the appropriate value.

7 to 11 are diagrams showing a fourth embodiment of the present invention. In this fourth embodiment, an adapter 42 is provided with protrusions 41 having different heights depending on the type of vibration transmission member. This adapter 42 is for screwing the threaded portion 11 of the vibration transmitting member 10 into the threaded hole 15 formed at the tip of the horn 6, and the adapter 42 has a wrench 43 on the outer periphery that engages with it as shown in FIG. A spanner engaging portion 44 is formed. Further, the adapter 42 has a structure that fits into the vibration transmitting member 1°, and can be pulled out from the distal end side of the vibration transmitting member 1°.

On the other hand, on the side of the driving device that drives the ultrasound probe 1, a fitting part 45 is formed, as shown in FIG. 10, into which the adapter 42 is detachably fitted. A microswitch 46 that engages with a protrusion 41 provided on the adapter 42 is provided within this fitting portion 45 .
6 is connected to a discrimination circuit 47 for discriminating the type of vibration transmission member 10, as shown in FIG. A drive circuit 48 is connected to the discrimination circuit 47, and the drive circuit 48 drives the ultrasound probe 1.

That is, in this fourth embodiment, a protrusion 41 provided on an adapter 42 is detected by a microswitch 46, and a discrimination circuit 47 discriminates the type of vibration transmission member 10 based on a signal from this microswitch 46. . The driving circuit 48 sets a matching constant of a matching transformer (not shown) based on the signal from the discrimination circuit 47 and drives the ultrasound probe 1, thereby making it possible to perform proper driving.

Further, FIG. 12 is a diagram showing a fifth embodiment of the present invention,
In this fifth embodiment, a plurality of projections 51 are provided at the rear end of the vibration transmission member 10 depending on the type of vibration transmission member, and the projections 51 are provided on the inner surface of a sheath 52 that covers the vibration transmission member 10. An engaging microswitch 53 is provided.

This microswitch 53 is connected to a counter 54 that counts the number of protrusions 51 provided on the vibration transmission member 10 as shown in FIG. A circuit 55 is connected. The discrimination circuit 55 includes a drive circuit 5.
6 is connected, and the ultrasonic probe 1 is driven by this drive circuit 56.

That is, in this fifth embodiment, when the sheath 52 is attached to the ultrasound probe 1, the sheath 5 is attached as shown in FIG.
A microswitch 53 provided on the inner surface of the vibration transmitting member 10 engages with a protrusion 51 provided on the vibration transmitting member 10 . Here, since the number of protrusions 51 differs depending on the type of vibration transmission member 10, the vibration is transmitted by counting the signal from the microswitch 53 with a counter 54 and determining the count value of the counter 54 with a discrimination circuit 55. The type of member 10 can be detected. Therefore, the drive circuit 56 sets the matching constant of a matching transformer (not shown) based on the signal from the discrimination circuit 55 and drives the ultrasonic probe 1. The impedance and the impedance on the ultrasonic probe side can be matched.

In addition, in the fifth embodiment, the vibration transmission member 10 has a protrusion 51.
In addition, a microswitch 53 that engages with the projection 51 is provided on the inner surface of the sheath 52 that covers the vibration transmission member 10 to detect the type of vibration transmission member.
As shown in FIGS. 6 and 17, the height of the flange 61 provided at the rear end of the vibration transmission member 10 is varied depending on the type of vibration transmission member, and the pressure sensor 62 is installed on the inner surface of the sheath 52 as described above. The pressure sensor 62 may be provided in correspondence with the flange 61°, and the pressure of the irrigation fluid flowing between the sheath 52 and the vibration transmission member 10 may be detected by the pressure sensor 62 to detect the type of vibration transmission member.

Further, as shown in FIGS. 18 and 19, the shape (in this case, the inclination angle) of the vibration transmission member 10 is changed depending on the type of vibration transmission member, and a plurality of light emitting elements 71 are arranged on the inner surface of the sheath 52. A light receiving element 72 is provided, and a light emitting element 71 is provided.
Alternatively, the vibration transmitting member 10 may be irradiated with light, and the reflected light may be received by the light receiving element 72 to detect the type of the vibration transmitting member. That is, if the shape of the vibration transmission member 10 is changed depending on the type of vibration transmission member, the light emitting element 71
Since the reflection angle of the light irradiated onto the vibration transmission member 10 changes from the vibration transmission member 10, the type of vibration transmission member can be detected by detecting which light receiving element 72 the light reflected from the vibration transmission member 10 is incident on. can.

Further, as shown in FIG. 20, a photoreflector 81 is provided on the inner surface of the sheath 52, and a reflection-absorbing material 82 is provided on the outer surface of the vibration transmission member 10, so that the light-emitting portion of the photoreflector 81 is connected to the reflection-absorbing material 82. Light is irradiated, and the reflected light is received by the light receiving section of the photoreflector 81. By changing the reflection-absorbing material 82 depending on the type of vibration transmission member, the type of vibration transmission member can be detected.

〔Effect of the invention〕

As explained above, the ultrasonic treatment apparatus according to the present invention includes an ultrasonic probe having a vibration transmission member that transmits ultrasonic vibrations to a treatment area, a driving means for driving this ultrasonic probe, and an impedance of this driving means. and a matching means for matching the impedance of the ultrasonic probe; a detecting means for detecting the type of the vibration transmitting member based on a difference in length of a threaded portion provided at the rear end of the vibration transmitting member; and adjusting means for adjusting the induced component of the matching means based on the detection result. Therefore, even if there are many vibration transmission members of different types, it is possible to match the impedance of the ultrasonic probe and the impedance of the drive means for driving it according to the type of vibration transmission member, and the ultrasonic probe can be It can be driven efficiently.

[Brief explanation of the drawing]

1 to 3C show a first embodiment of the present invention, in which FIG. 1 is a sectional view of an ultrasonic probe, FIG. 2 is a configuration diagram of a driving device for driving an ultrasonic globe, and FIGS. Figure 3C is a diagram showing the impedance characteristics when an ultrasound treatment device is driven by attaching different types of vibration transmission members to the ultrasound probe, Figure 4 is a diagram showing the second embodiment of the present invention, and Figure 5 6 shows a third embodiment of the present invention, FIG. 5 is a sectional view showing the tip of the horn of an ultrasonic probe, FIG. 6 is a configuration diagram of a drive device for driving the probe, and FIG. 7 11 shows a fourth embodiment of the present invention, FIG. 7 is a sectional view showing the rear end of the vibration transmission member and the tip of the horn, and FIG.
A sectional view taken along line A-A in the figure, Figure 9 is B-B in Figure 7.
A sectional view taken along the line, FIG. 10 is a diagram showing a part of the driving device that drives the ultrasonic probe, FIG. 11 is a configuration diagram of the driving device, and FIG. 12 is a fifth embodiment of the present invention. FIG. 13 is a cross-sectional view of the ultrasonic probe, FIG. 13 is a configuration diagram of a driving device that drives the probe, FIGS. 14 and 15 are diagrams for explaining the operation of the same embodiment, and FIG. FIG. 17 is a detailed view of part 0 shown in FIG. 16, FIGS. 18 and 19 are views showing the seventh embodiment of the present invention, and FIG. It is a figure which shows the 8th Example of this invention. 1... Ultrasonic probe, 2... Exterior cover 3...
・Ultrasonic vibrator, 4... Piezoelectric element, 5... Plate electrode, 6... Horn, 7... Backing material, 8... Bolt, 9... Nut, 10a to 10c ...Vibration transmission member, 11...Threaded portion, 12...Suction hole, 13...Suction cap, 14...Power cord, 15...Screw hole, 2
1... Matching transformer, 22... Drive circuit, 23...
・Resonance point detection circuit, 24... Relay drive circuit, 25.
...Relay 26...Reflected wave detection circuit, 31...Piezoelectric rubber, 33...Pressure detection circuit. Figure 4 Figure 1 Figure 9 Figure 18 Figure 19 Figure 20

Claims (1)

[Claims] an ultrasonic probe having a vibration transmission member that transmits ultrasonic vibrations to a treatment site; a driving means for driving the ultrasonic probe; a matching means for matching the impedance of the driving means with the impedance of the ultrasonic probe; a detecting means for detecting the type of the vibration transmitting member based on a difference in the length of a threaded portion provided at a rear end of the vibration transmitting member; and an adjusting means for adjusting the induction component of the aligning means based on the detection result of the detecting means. An ultrasonic treatment device characterized by comprising: