JPH078298B2 - Hyperthermia device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hyperthermia device used for treating a tumor by hyperthermia.

[Conventional technology]

As a conventional hyperthermia device, for example, Japanese Patent Publication No. 56-
As disclosed in Japanese Patent No. 38230, by automatically matching the output impedance of the high frequency oscillating means and the input impedance of the load circuit including the electrode and the living body supplying the high frequency energy from the high frequency oscillating means, the high frequency There is a device that efficiently supplies energy to the living body.

[Problems to be solved by the invention]

However, in the above-mentioned conventional hyperthermia device, since there is no protection against the mismatch at the start of the supply of the high frequency energy, when the desired high output high frequency energy is suddenly supplied at the start of the supply, the high reflection due to the mismatch occurs. There is a problem that equipment is damaged by wave power.

The present invention has been made in view of such conventional problems, and provides a hyperthermia device appropriately configured to effectively prevent damage to equipment due to mismatch at the start of supply of high-frequency energy. To aim.

[Means and Actions for Solving Problems]

To achieve the above object, in the present invention, the high-frequency energy output from the high-frequency oscillating means is set to a low output at the time of starting the supply, and is desirably obtained after the automatic matching means substantially matches the supply of the low-output high-frequency energy. A means for controlling the high frequency oscillating means is provided so that the high output can be obtained.

〔Example〕

FIG. 1 shows an embodiment of the present invention. In this embodiment, one body electrode (hereinafter referred to as the first electrode) 1
And two extracorporeal electrodes (hereinafter referred to as the second and third electrodes) 2,3
From the and, the two electrodes are switched and selected by the changeover switch 4, and the input impedance of the load circuit including the selected two electrodes and the output impedance of the RF oscillator 5 are automatically matched by the variable matching device 6. Selected 2
High-frequency energy from the RF oscillator 5 is supplied between the electrodes. The changeover switch 4 and the variable matching unit 6 are
It is provided on the interface 7 located near the patient.

The first electrode 1 is inserted into the body cavity 9 of the living body 8 and arranged so as to face the tumor 10. The first electrode 1 is covered with a balloon 11, and a conductive liquid medium such as physiological saline is circulated through the balloon 11 via a heat exchanger (not shown) provided outside, so that the balloon 11 is in contact with the portion. The inner wall of the body cavity should be heated or cooled.

Further, the second electrode 2 is arranged on one surface of the living body 8 so as to face the first electrode 1 and the tumor 10, and the third electrode 3 is, for example, the other surface of the living body 8 so as to face the second electrode 2. To place. These second and third electrodes 2 and 3 are brought into contact with the living body 8 via the balloons 12 and 13 as with the first electrode 1, and
A conductive liquid medium such as physiological saline is circulated through the balloons 12 and 13 via a heat exchanger (not shown), thereby cooling the living body surface at the portion where the balloons 12 and 13 are in contact. The heating or cooling system by the liquid medium in the first electrode 1 and the cooling system by the liquid medium in the second and third electrodes 2 and 3 are electrically separated from each other.

FIG. 2 is a block diagram showing a configuration of an example of the RF oscillator 5 shown in FIG. In this example, the high frequency energy (RF signal) from the oscillator 21 is supplied to the high frequency amplifier 22 and the matching device 23.
To the coaxial cable 24. Matching device 23 is for matching with coaxial cable 24.
The outputs of 24 are connected to the variable matching device 6 of the interface 7 arranged near the patient. The interface 7 includes a connector in addition to the variable matching box 6 and the changeover switch 4.
31, 32, 33 are provided, and the first to third electrodes 1 to 3 (see FIG. 1) are connected to these connectors 31 to 33 through conductive wires, respectively.
Two electrodes are switched and selected from these electrodes by the changeover switch 4, and the RF signal supplied between the selected electrodes via the coaxial cable 24 is applied via the variable matching unit 6 and the changeover switch 4. . In this example, the switching of the electrodes by the changeover switch 4 is controlled by the main control unit 34 according to a predetermined program. Further, the interface 7 is provided with connectors 35, 36, 37 for temperature detectors, and these connectors 35 to 37 are connected to temperature detectors for detecting the temperature of the portion heated by the electrodes, and their outputs are connected to the main controller. Supply to 34. The change-over switch 4 can also be program-controlled using the temperature thus detected as a parameter.

On the other hand, between the high frequency amplifier 22 and the matching unit 23, a phase measuring device 38 and a transmission type power meter 39 are connected, and the phase of the RF signal is input by the phase measuring device 38 and the RF signal is input by the transmission type power meter 39. Measure the power and the reflected power respectively. The outputs of the phase measuring device 38 and the transmission type wattmeter 39 are supplied to the main control unit 34 and the automatic matching control unit 40, and the automatic matching control unit 40 controls the variable matching unit 6 to change the switch 4 The input impedance of the load circuit including the two electrodes selected in step 1 is automatically matched with the output impedance of the coaxial cable 24, that is, the RF oscillator 5.

The high frequency amplifier 22 is driven by a power supply unit 41, and the power ON / OFF control unit controls the power supply unit 41 under the control of the main control unit 34.
The output of the high-frequency amplifier 22 is controlled to be ON / OFF controlled by 42. As a result, for example, the RF signal output is turned off when the switching of the electrodes is selected by the changeover switch 4, and it is turned off when the temperature of the heating portion detected by the temperature detector is equal to or higher than the set temperature, and is set to be equal to or lower than the set temperature. Control to turn on when it becomes.

Further, the reflected power measured by the transmission power meter 39 is also supplied to the overreflection monitoring unit 43, and when the reflected power exceeds the reference value as compared with a predetermined reference value, the signal is displayed by the overreflection. Bowl 44
Is supplied to display the occurrence of overreflection, and the main control unit 34
And the forced OFF control unit 45 to supply the forced OFF control unit 45.
Controls the RF signal output from the high-frequency amplifier 22 to be forcibly turned off via the output ON / OFF control unit 42 and the power supply unit 41. This prevents damage to the device due to excessive reflected power due to a sudden impedance mismatch due to the electrodes coming off the connectors 31 to 33.

In this embodiment, the amplification factor of the high frequency amplifier 22 is controlled by the main controller 34.
The frequency is controlled by the control of the high frequency at the time of starting the oscillation or starting the supply of the RF signal to the living body by switching the electrodes with the changeover switch 4, and when the matching state becomes worse than a certain reference value during the supply of the RF signal. The output of the amplifier 22 is set to a low output, and automatic matching is performed in this low output state, and after the desired matching is achieved, the output is controlled to a predetermined high output. In this way, damage to the device due to impedance mismatch at the start of or during the supply of the RF signal to the living body is prevented.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications and changes can be made. For example, the number of body electrodes to be inserted into the body cavity is not limited to one, and a plurality of body electrodes may be provided in the insertion direction and selected and used. Further, the number of extracorporeal electrodes is not limited to two and may be one or three or more. Further, the changeover switch 4 is not limited to automatic operation, but may be manually operated.

〔The invention's effect〕

As described above, in the present invention, the output is set to a low output at the time of starting the supply of the high-frequency energy to the living body, and in this low output state, the output is set to the desired high output after the automatic matching means has substantially matched the output. Since the high frequency oscillating means is controlled as described above, it is possible to effectively prevent the damage to the device due to the mismatch at the start of supplying the high frequency energy.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a configuration of an example of the RF oscillator shown in FIG. 1 ... Internal electrode, 2,3 ... Extracorporeal electrode 4 ... Changeover switch, 5 ... RF oscillation device 6 ... Variable matching device, 7 ... Interface 8 ... Body, 9 ... Body cavity 10 ... Tumor, 11〜13 …… Balloon 21 …… Oscillator, 22 …… High-frequency amplifier 23 …… Matching device, 24 …… Coaxial cable 31 ～ 33 …… Connector, 34 …… Main control unit 35 ～ 37 …… Connector, 38 …… Phase measuring device 39 …… Transmission wattmeter, 40 …… Automatic matching control unit 41 …… Power supply unit, 42 …… Output ON / OFF control unit 43 …… Overreflection monitoring unit, 44 …… Overreflection display unit 45… ... Forced OFF control unit

Front page continuation (72) Inventor Tadashi Abe 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Shuichi Takayama 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industry Co., Ltd.

Claims (1)

[Claims] 1. A hyperthermia device in which high-frequency energy from a high-frequency oscillating means is supplied to a living body through an automatic matching means, and when the high-frequency energy is supplied to the living body, its output is set to a low output and the automatic matching is performed. A hyperthermia device comprising means for controlling the high-frequency oscillating means so that the output is set to a desired high output after the output is substantially matched by the means.