JP2733966B2 - High-frequency thermal treatment equipment - Google Patents

Description

The present invention relates to a high-frequency thermotherapy device for applying a high-frequency voltage to, for example, a tumor tissue of a patient to perform a heating treatment, and more specifically, to a device main body, electrodes, and the like. For impedance matching.

(B) Conventional technology The high-frequency heat treatment applied to the treatment of cancer, etc., applies a high-frequency electric field to a treatment site of a patient to heat tumor tissue such as cancer and cause the tumor tissue to necrosis. is there. FIG. 3 shows a known apparatus for performing this high-frequency hyperthermia treatment.

The high-frequency hyperthermia apparatus includes an apparatus main body 24 including a high-frequency generation circuit, and applicators 21 attached to the patient p. The applicator 21 includes a liquid storage bag 22 and an electrode 23. Cooling water is circulated in the liquid storage bag 22, so that the temperature rise of the patient's skin and the electrode 23 is suppressed. On the other hand, the electrode 23 is connected to the
And a high-frequency voltage is applied.

(C) Problems to be solved by the invention In the high-frequency hyperthermia treatment, applicators having different sizes and structures are required in order to cope with various positions of the affected part. In some cases, impedance matching between the main body and the main body is disturbed, and energy is not efficiently transmitted. Therefore, the conventional high-frequency thermotherapy device has a built-in impedance matching circuit in the device body,
The electrical characteristics of the two applicators (the characteristics of the imaginary part of the load impedance) are matched to improve the efficiency of energy transmission.

However, when the impedance matching circuit is built into the device body, the matching range is limited.Therefore, when using an applicator outside the intended range, the device body must be modified. there were.

Therefore, it is conceivable to incorporate a matching circuit on the applicator side. However, in the case of an applicator for an intracavity (oral cavity, rectum, uterus, etc.), the applicator is inconvenient because it is large and heavy. Further, the applicator is subjected to a fine structural change depending on the application, but there is a problem that this structural change is not easy due to a matching circuit.
Further, since the matching circuit generates considerable heat when a high-frequency voltage is applied, there is a risk that a user may be burned when handling the applicator. Further, there is a problem that the cost of the applicator increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and has as its object to provide a high-frequency hyperthermia therapy apparatus that can easily cope with various applicators.

(D) Means for Solving the Problems In order to solve the above problems, a high-frequency thermotherapy apparatus according to the present invention includes an apparatus main body including a high-frequency generating means, an electrode mounted on a heated object, the electrode and the apparatus. A feeder line for connecting to the main body, wherein the feeder line is provided with a correction circuit for correcting the characteristic of an imaginary part of the load impedance.

(E) Function In the high-frequency thermotherapy apparatus of the present invention, since the correction circuit is provided in the power supply line, it is not necessary to perform the correction on the apparatus main body side. Becomes unnecessary. In addition, there is no need to incorporate a correction circuit in the electrode, and the size and weight of the electrode can be reduced, and burns can be prevented.

(F) Embodiment One embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a longitudinal sectional view of a correction circuit section 2 provided on a cable (feed line) 1 of the high-frequency thermotherapy apparatus according to this embodiment, and FIG. 2 shows these cables 1 and the correction circuit section 2.
FIG. 2 is a view showing the applicator together with the intracavity applicator 11.

The correction circuit unit 2 is provided in a cylindrical synthetic resin case 3.
The cable 1 is passed through the case 3, the cable 1 is wound into a coil shape in the case 3, an inductance L is formed, and the value of L is appropriately adjusted according to the number of turns.

The case 2 is open at one end and is closed by the lid 4. Flexible joints 5, 5 are screwed into the case end face 3 a and the lid 4, and the cables 1 are introduced into the case 3 through the flexible joints 5, respectively. The flexible joint 5 includes a union 6 and a nut 7
By fastening the nut 7 to the union 6, the cable 1 is fixed so as not to move in the left-right direction in FIG. 7a is the cable 1
Is a boot for protecting the same from being bent.

After completion of assembly and adjustment, the case 3 is covered with a heat-shrinkable tube and heated, and the contracted tube 8 is fixed to the case 3 so that the lid 4 is not opened.

The cable 1 has a crimp terminal 1a at one end and is connected to a well-known high-frequency thermotherapy device main body (not shown). On the other hand, the other end of the cable 1 is connected to the applicator 11.

The applicator 11 includes an insertion section 12 and a grip section. An electrode 13 is supported in the insertion section 12, and cooling water is circulated in the insertion section 12. 14a, 14b
Is a joint for inflow and outflow of the cooling water. on the other hand,
The grip portion 15 supports the proximal end portion 13a of the electrode 13, and the cable distal end 1b drawn in via the flexible joint 16 is connected to the electrode proximal end portion 13a from the grip portion rear end portion 15a.

If the length of the cable 1 between the applicator 11 and the correction circuit unit 2 is set appropriately, the correction circuit unit 2 is less likely to touch the operator when handling the applicator 11, and Burns due to heat generation can be prevented. In addition, if the terminal connected to the apparatus main body and the correction circuit unit are integrated, it is possible to prevent the correction circuit unit from hanging around and obstructing during the treatment.

In the above embodiment, a coil constituted by a cable is used as the correction circuit. However, a correction circuit may be provided by incorporating a capacitor.

Furthermore, in the above embodiment, the applicator is shown as a probe for insertion into a cavity. However, the present invention does not specify the shape and structure of the applicator, and the conventional applicator as shown in FIG. Applicator or, for example,
It can also be used for an applicator having a support arm described in 168894.

(G) Effects of the Invention As described above, the high-frequency thermotherapy apparatus of the present invention is characterized in that the power supply line is provided with the correction circuit for correcting the characteristic of the imaginary part of the load impedance. There is an advantage that it is not necessary to modify the apparatus main body when using an electrode outside the predetermined range. Also, since the correction circuit is not built in the electrode, the electrode is small, lightweight,
It has the advantages that it can be reduced in price, can easily make fine structural changes for each application of the electrode, and can prevent burns due to the correction circuit when handling the electrode.

On the other hand, since the correction circuit section does not have to be forcibly incorporated in the apparatus main body or the electrodes, there is an advantage that the degree of freedom in designing the apparatus is increased. In addition, the length of the feed line is changed,
When the heating object is changed, there is an advantage that the correction circuit can be easily changed according to the change.

Further, if the feed line is curled in a coil shape to obtain an inductance as shown in the embodiment, there is an advantage that the number of parts and the number of assembling steps can be reduced. In addition, there is an advantage that the waterproof structure can be easily obtained, and the adjustment can be easily performed by changing the number of turns of the power supply line.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a correction circuit unit of a high-frequency thermotherapy apparatus according to an embodiment of the present invention. FIG. 2 is a diagram showing the correction circuit unit together with a cable and an intracavity applicator. FIG. 1 is a diagram showing a schematic configuration of a conventional high-frequency hyperthermia treatment apparatus. 1: cable, 2: correction circuit, 11: intracavity applicator, 1
3: Electrodes.

Claims (1)

(57) [Claims] 1. A high-frequency thermotherapy apparatus comprising: an apparatus main body including high-frequency generating means; an electrode mounted on a heated object; and a power supply line connecting the electrode to the apparatus main body. A high-frequency hyperthermia therapy device, further comprising a correction circuit for correcting the characteristics of the imaginary part of the load impedance.