JPH0780085A - Therapeutic device by ultrasonic heating - Google Patents

Abstract

PURPOSE:To provide the therapeutic device by ultrasonic heating which can execute easily output control by providing a power display means for displaying high-frequency power detected by a power detecting means, and a display means for displaying electromagnetic field intensity detected by a detecting means for detecting the intensity of an electromagnetic field in an adjacent position of a living body. CONSTITUTION:A high-frequency wattmeter 404 measure high-frequency power supplied to a living body 500 between electrode plates 306, 307, and a measured value of the high-frequency wattmeter 404 is inputted to a control circuit 105, and displayed on a display part 102. An electromagnetic field intensity meter 310 is constituted of a sensor part 311 and a receiver part 312, and the sensor part 311 consists of a minute coil for picking up a magnetic field, and is arranged so that the magnetic field interlinks vertically the coil face in an adjacent position of the living body 500. The receiver part 312 detects the intensity of the electromagnetic field picked up by the sensor part 311, and inputs detected data to the control circuit 105. The control circuit 105 displays a result of the detected data on a display part 104.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrashort wave heating device for irradiating a living body with a high frequency wave to induce necrosis and destruction of cancer cells in the living body by dielectric heating.

[0002]

2. Description of the Related Art Conventionally, there has been known an ultra-short-wave warming treatment apparatus which heats and treats a diseased part of a living body by radiating and supplying high-frequency energy from a pair of electrodes sandwiching the living body (JP-A-55). -130675, JP-A-56-80265). This ultra-short-wave heating apparatus treats, for example, when the abnormal cell tissue forming cancer or other tumor and the surrounding normal cell tissue are both heated in a temperature range of 40 ° C. or higher, the former abnormal cell tissue becomes normal. Focusing on the fact that the temperature is higher by 2 to 2.5 ° C. than that of cellular tissue, while maintaining normal cellular tissue at 43 ° C. or below that does not necrosis,
The temperature was raised up to around 5 ° C to prevent necrosis and collapse.

In such a device, since the conditions of the heating temperature of the affected area are severe as described above, it is extremely important to monitor the internal temperature, and during the heating treatment, high-frequency energy is used to monitor the internal temperature of the living body. The temperature is measured by inserting the required number of needle-like thermometers into the body where is emitted. And
The heating temperature is controlled by adjusting the output of high-frequency energy while monitoring the temperature measurement result.

[0004]

In the conventional ultra-short-wave heating treatment apparatus, the output of high-frequency energy is adjusted by using the temperature in the living body as a guide, but in reality, the correlation of the heating temperature with the output of high-frequency energy is used. However, it is very difficult to control the suitable heating temperature even though the temperature measurement result in the living body is used as a guide. That is, in the ultra-short wave heating treatment device, impedance mismatch between the device and the living body is likely to occur due to a change in the condition of the living body due to movement of the patient or temperature rise during treatment, and a transmission loss occurs at the electrode position. Therefore, for example, if there is a relatively large transmission loss, of the high frequency energy output from the device body,
Since the amount of energy effectively used for the high frequency electric field applied to the living body is unstable, it is difficult to predict the heating temperature of the living body from the output of the high frequency energy.

Further, since a required number of needle thermometers are inserted into the living body and the temperature of the affected area is directly measured, the patient is distressed during the treatment.

The present invention has been made in view of the above,
It is an object of the present invention to provide an ultrashort-wave heating treatment device that can easily control output by monitoring the high-frequency energy actually supplied to the living body.

[0007]

Means for Solving the Problems The present invention provides an ultra-short wave heating device for placing an affected area inside a living body between a pair of electrodes, and generating a high frequency electric field between the electrodes to dielectrically heat the affected area. An output changeable high frequency generating means for generating a high frequency to be supplied, a power detecting means for detecting a high frequency power supplied to the electrode, and a power display means for displaying the high frequency power detected by the power detecting means, It is provided with a detection means for detecting the strength of the electromagnetic field in the vicinity of the living body and a display means for displaying the strength of the electromagnetic field detected by the detection means (claim 1).

The present invention further comprises temperature calculating means for calculating the temperature in the living body from the electromagnetic field intensity detected by the detecting means, and the displaying means displays the calculated temperature (claim) Item 2).

[0009]

According to the present invention, the high frequency power supplied from the high frequency generating means to the electrodes is displayed, the strength of the electromagnetic field in the vicinity of the living body is detected, and the detection result is displayed. Since the electromagnetic field is generated in the living body and caused by the high frequency electric field, its intensity has a correlation with the amount of energy of the high frequency electric field. On the other hand, the amount of energy of the high-frequency electric field is directly related to the heating temperature of the living body due to the dielectric heating, so that the electromagnetic field strength has a correlation with the heating temperature of the living body due to the dielectric heating.

Therefore, it is possible to know whether or not the high frequency power generated by the high frequency generating means is effectively utilized for the dielectric heating by monitoring the electromagnetic field strength, and this information and the supplied high frequency power are used. Based on this, output adjustment of high frequency power can be efficiently performed.

Further, according to the present invention, the electromagnetic field strength is converted into the temperature of the living body and displayed, and the actual heating temperature of the living body can be predicted by this temperature information.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 is an external view of an ultrashort wave heating treatment apparatus according to the present invention. The ultra-short wave heating treatment device includes a control unit 100,
The treatment table 200, the gantry 300, and the high frequency generator 400 are included.

The control unit 100 includes an operation unit 101 for controlling heating, cooling, matching, etc., and the high frequency generator 4 described above.
00, a display unit 102 for monitoring a heating state, a treatment state of a patient, and the like, an output unit 103 such as a printer for outputting various data regarding treatment, and an input unit 104 for inputting various information regarding treatment. .

The gantry 300 irradiates a patient with a high frequency, and a through hole 301 is formed in the central portion of the gantry body.
Is provided. A support portion 302 is provided on the inner side surface of the through hole 301 so as to be rotatable with respect to the gantry body, and its rotation angle can be adjusted by an operation portion 303. A pair of electrode portions 304 and 305 are provided on the support portion 302 so as to face each other. This electrode portion 304,
Reference numeral 305 denotes a disc-shaped electrode plate 306, 30 of the same or similar shape whose tip is covered with cooling pads 308, 309.
7 is provided. The electrode portions 304 and 305 are movable in the radial direction, and are used for the treatment of the electrode plate 30 during treatment.
6,307 are designed to be pressed against the patient. The electrode units 304 and 305 can also be operated by the operation unit 303. Further, the treatment table 200 has a pair structure that sandwiches the gantry 300.

Further, the electromagnetic field intensity meter 3 is provided on the support portion 302 which is orthogonal to the axes of the electrode portions 304 and 305.
10 is projected. The electromagnetic field intensity meter 310 detects the amount of high-frequency energy actually supplied to the living body by detecting the magnetic field of the electromagnetic field generated around the patient during treatment, and is a sensor that picks up the magnetic field at the tip. It has a part 311. The electromagnetic field intensity meter 308 is movable in the radial direction and the circumferential direction, and the sensor unit 3
11 can be arbitrarily set at a desired position near the living body. Normally, during the heating treatment, the sensor unit 311 is
In order to detect the strength of the electromagnetic field in a position as close to the living body as possible, it is arranged, for example, at an intermediate position between the electrode plates 306 and 307 and at a position 15 cm or less from the living body. When the electrode plates 306 and 307 are not the same and one is small, the sensor unit 311 may be arranged so as to be biased toward the smaller electrode plate.

The electromagnetic field intensity meter 310 is also the operation unit 30.
3 can be operated, but the electrode section 304,
It is also possible to automatically set the electromagnetic field intensity meter 310 to a predetermined position according to the size and the setting position of the electrode plate of 305. The detection data of the electromagnetic field intensity meter 310 is input to the control unit 100.

The high frequency generator 400 is composed of the electrode plate 30.
6, 307 generates a high frequency of, for example, several MHz, and has a power supply circuit, a high frequency generation circuit, a matching circuit, and a high frequency power meter. This high frequency generator 400
The drive of each unit of is controlled by the control unit 100.

FIG. 1 is a block diagram of an ultra-short wave heating treatment apparatus according to the present invention. In the figure, the power supply circuit 40
1, the high frequency generation circuit 402, the matching circuit 403, and the high frequency power meter 404 are provided in the high frequency generation unit 400. The power supply circuit 401 supplies a predetermined power to the high frequency generation circuit 402. In addition, the high frequency generation circuit 4
Reference numeral 02 is a self-excited oscillation system that generates a high frequency of, for example, 8 MHz.
The output can be changed within the range. The output of the high frequency generation circuit 402 is controlled via the control circuit 105 in the control unit 100. That is, when the output setting value is input from the input unit 104 of the control unit 100, the control circuit 105 generates an output control signal based on the output setting value,
This output control signal is input to the high frequency generation circuit 402 to control its output.

The matching circuit 403 is the high frequency generating circuit 4 described above.
02 placed between the electrode 02 and the electrode plates 306 and 307 (load)
The impedance matching with 500 is performed and can be adjusted through the control circuit 105.

The high frequency power meter 404 is based on the electrode plate 30.
The high frequency electric power P supplied to the living body 500 between 6 and 307 is measured. This high-frequency power meter 404 measures the incident power Pi on the electrode plates 306, 307 and the electrode plates 306, 3
The reflected power Pr from 07 is detected, and the supplied power P (= Pi-Pr) supplied to the load side from both powers is calculated. The measurement value of the high frequency power meter 404 is input to the control circuit 105 and displayed on the display unit 102.

The electromagnetic field intensity meter 310 is composed of the sensor section 311 and the receiver section 312. The sensor unit 311 includes a minute coil that picks up the magnetic field H, and is arranged in the vicinity of the living body 500 so that the magnetic field H vertically intersects the coil surface. Further, the receiver unit 312 detects the intensity Pw of the electromagnetic field picked up by the sensor unit 311 and inputs the detection data to the control circuit 105. The control circuit 105 displays the result of the detection data directly or after converting it into a required unit on the display unit 104. For example, the magnetic field strength H (A / m) is converted into a unit such as electric field strength (V / m) or electric power (W / m ² ) and displayed on the display unit 104.

The intensity Pw of the electromagnetic field in the vicinity of the living body 500 is displayed separately from the power supply P because a part of the power supply P supplied to the load side is the electrode plate 30.
Electromagnetic waves are radiated from 6 and 307 directly into space (hereinafter referred to as radiation loss), and all are electrode plates 306 and 3
This is because it is not used for the energy of the electromagnetic field during 07.

FIG. 3 is a diagram showing the relationship between the supply power P (W) and the temperature rise ΔT (= T-T0 (initial temperature)) (° C.) of the body to be heated, and FIG. 4 is the electromagnetic field. It is a figure which shows the relationship between the intensity | strength (A / m) and the temperature rise ΔT (° C.) of the object to be heated.

Both figures show electrodes 306,
Cubic agar K having a side of 20 cm is arranged between 307 as a dummy of the living body 500, and the electrode plates 306, 30 are arranged.
The sensor portion 311 of the electromagnetic field intensity meter 310 is placed at a distance of 15 cm from the agar K at an intermediate position between 7 and the intensity Pw of the electromagnetic field in the vicinity of the agar K and the rising temperature Δ of the agar K.
The relationship with T was investigated.

In both figures, the electrode plate 307 has a diameter of 25 cm.
And the diameter of the electrode plate 306 is 10 cm, 14 cm, and 25 cm.
Experiments were carried out on different kinds of disc-shaped electrode plates, and the electrode plate 306 had a diameter of 10 cm, 1
4 cm and 25 cm, while the thermometers are on the axes of the opposing electrode plates, in the case of
6 is inserted at a position 3-4 cm below, 6 is inserted at a position 4-5 cm below the electrode plate 306, and is inserted at an intermediate position between the electrode plates 306 and 307. This is in consideration of the actual situation in the medical field in which, when the lesion is located in a biased position in the living body, a small size electrode plate on the lesion side is adopted in order to concentrate the electromagnetic field at that portion. is there.

As shown in FIG. 3, the supply power P and the temperature rise ΔT of the object to be heated have a weak correlation, and it is difficult to predict the heating temperature of the object to be heated from the integrated value of the supply power P. Is.
Therefore, it is understood that it is difficult to appropriately control the heating temperature of the living body 500 even if only the supplied power P is monitored and the output of the high frequency generation circuit 402 is adjusted. this is,
It is considered that this is due to the large influence of the loss that is not used as the electromagnetic field energy in the living body such as the radiation loss in the electrode plates 306 and 307. In an actual medical field, the characteristics of the living body 500 as a load are not uniform, and the patient moves during the treatment, so that the electrode plates 306 and 307 are moved.
Considering that the contact condition between the living body 500 and the living body 500 is easily changed, it is estimated that the correlation between the supplied power P and the temperature rise ΔT of the heated object becomes weaker.

On the other hand, the relationship between the magnetic field strength H and the temperature rise ΔT of the body to be heated has a good correlation as shown in FIG. 4, and the strength P of the electromagnetic field in the vicinity of the living body 500.
It can be understood that the heating temperature T of the living body 500 can be controlled relatively favorably by monitoring w and adjusting the output of the high-frequency generation circuit 402. Since the electromagnetic field in the vicinity of the living body 500 is a part of the electromagnetic field actually formed between the electrode plates 306 and 307, the strength Pw of the electromagnetic field is the living body 500.
It is considered that there is a strong correlation with the strength of the electromagnetic field inside, that is, the amount of electromagnetic field energy. On the other hand, in the dielectric heating phenomenon, the electromagnetic field energy applied to the living body 500 is thermally consumed due to the dielectric loss.
It is considered that w has a strong correlation with the temperature characteristics due to dielectric heating.

Therefore, if the power supply P and the intensity Pw of the electromagnetic field near the living body 500 are monitored,
Since the actual heating state of the living body 500 can be predicted from the intensity Pw of the electromagnetic field, the heating treatment can be controlled effectively and efficiently by adjusting the output (supply power P) of the high frequency generator 402 based on this. Is possible.

In the above embodiment, the electromagnetic field strength Pw
Was directly displayed by the magnetic field strength, the electric field strength, the electric power, etc., the electromagnetic field strength Pw and the temperature rise Δ of the living body 500
Utilizing the correlation with T, the strength Pw of the electromagnetic field is set to 500
The heating temperature T may be converted into the heating temperature T and the heating temperature T may be displayed.

For example, the integrated value of the electromagnetic field strength Pw is PW
(= Pw · t (time)), and the temperature rise Δ of the living body 500
If T is represented by K · PW, the heating temperature T of the living body 500 is represented by T = K · PW + T0 (initial temperature).
A heating temperature T of 0 can be predicted.

Since the proportional coefficient K generally changes depending on the initial temperature T0, if a plurality of arithmetic expressions are prepared according to the initial temperature T0 and the corresponding arithmetic expressions are used according to the initial temperature T0. The accuracy of the calculated value of the heating temperature T is improved. Further, since the proportional coefficient K changes depending on the heating temperature T, setting the function K (T) for the heating temperature T improves the accuracy of the calculated value of the heating temperature T. Further, when the high frequency is intermittently supplied from the high frequency generation circuit 402, the living body 50 is output during the output stop period.
Since the heating temperature T of 0 decreases, it is advisable to add a correction term for correcting the decrease in the above equation.

It should be noted that a conversion table is prepared in advance in place of the above equation, and the heating temperature T is directly calculated from the initial temperature T0 and the integrated value PW of the electromagnetic field strength Pw using the conversion table. You may

Further, the output control value of the high frequency generation circuit 402 may be roughly estimated from the detection data for the intensity Pw of the electromagnetic field, and the estimated value may be displayed. If you do this,
The operator can know the approximate output control value of the high frequency generation circuit 402, and the operability of output control can be improved.

It is preferable to display the supplied power P and the electromagnetic field strength Pw.
As a guide for checking the heating state of the
Only w may be displayed.

[0035]

As described above, according to the present invention,
Place the affected area inside the living body between a pair of electrodes, in the ultra-high frequency heating device that dielectrically heats the affected area by the high frequency electric field generated between the electrodes, to detect the strength of the electromagnetic field in the vicinity of the living body, the detection result Since the temperature is monitored, it becomes easy to predict the amount of high-frequency energy actually supplied to the living body and the heating temperature of the living body, and effective and efficient output control of the high-frequency generating means becomes possible.

Further, since the electromagnetic field strength is converted into the heating temperature of the living body and displayed, the heating temperature of the living body can be predicted more reliably, and the output control of the high frequency generating means can be more effectively performed. It can be carried out.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of an ultra-short wave heating treatment device according to the present invention.

FIG. 2 is an external view of an ultrashort-wave heating treatment device according to the present invention.

FIG. 3 is a diagram showing a relationship between a power supply P and a temperature rise ΔT (° C.) of a body to be heated.

FIG. 4 is a diagram showing a relationship between the strength of an electromagnetic field and a rise temperature ΔT (° C.) of a heated body in a position near the heated body.

[Explanation of symbols]

 100 control unit 101 operation unit 102 display unit 103 output unit 104 input unit 105 control circuit 200 treatment table 300 gantry 304, 305 electrode unit 306, 307 electrode plate 310 electromagnetic field intensity meter 311 sensor unit 312 receiver unit 400 high-frequency generation unit 401 power source Circuit 402 High frequency generation circuit 403 Matching circuit 404 High frequency power meter 500 Living body

Claims (2)

[Claims] 1. Placing an affected part inside a living body between a pair of electrodes,
In an ultra-short-wave heating device for generating a high-frequency electric field between the electrodes to dielectrically heat the affected area, a high-frequency generator capable of changing the output for generating a high-frequency supplied to the electrodes and a high-frequency power supplied to the electrodes are used. Power detection means for detecting, power display means for displaying the high frequency power detected by the power detection means, detection means for detecting the strength of the electromagnetic field in the vicinity of the living body, and electromagnetic waves detected by the detection means. An ultrashort-wave heating treatment device comprising: a display unit for displaying the field strength. 2. The ultrashort-wave heating treatment apparatus according to claim 1, further comprising temperature calculation means for calculating the temperature in the living body from the electromagnetic field intensity detected by the detection means, and the display means is the calculated temperature. An ultra-short wave heating treatment device characterized by being displayed.