JPH0817826B2 - Low frequency heating treatment device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to low frequency heating devices, and more particularly to devices that use low frequency induction heating in the treatment of cancer and other tumors.

[Background of the Invention]

Since cancers and other tumors have poorer blood vessel development than normal human cell tissues, and therefore have insufficient cooling action and weak resistance to heat, normal tissues are not damaged in a short time 43 ~ By heating to 45 ° C, only tumor cells can be necrotic. Although treatment of cancer by scarlet fever has been known empirically for a long time, in recent years, various heat treatment methods have been attempted as hyperthermia. Also,
According to recent research, if the temperature is kept at 43 to 45 ° C without sufficiently supplying oxygen to cancer tumors, the resistance to radiation such as X-rays and drugs are significantly reduced. It has been experimentally confirmed that it is effective even when weighted.

The mainstream of such a heating method is high frequency (ultra short wave) heating as in the example of Japanese Patent Laid-Open No. 58-30063. The disadvantage of this method is that the device is expensive and the temperature measurement is difficult, so in order to prevent the temperature sensor from interfering with the microwave, use a special switching device such as stopping the microwave during temperature measurement or an optical thermometer. This requires expensive and inconvenient temperature measuring means.

[Object of the Invention]

An object of the present invention is to provide a low-frequency heating treatment device provided with a heating element having high heat generation efficiency.

[Outline of Invention]

The low frequency heating treatment apparatus of the present invention comprises a coil for generating an alternating magnetic field by a low frequency oscillator, and a heating element heated by magnetic induction by the coil, and a low frequency for heating an affected part of a living body by the heating element. In the heating treatment device, the low-frequency oscillator emits a frequency of 10 to 100 kHz, the heating element is made of a non-magnetic conductive wire having a specific resistance of 1 to 20 μΩcm at room temperature, and by the braid of the wire. It is characterized by being configured.

The present invention is a heating by a low frequency of about 10 to 100 kilohertz, particularly in order to facilitate heating with a low-frequency oscillator of low power, in order to facilitate the heating, a non-magnetic conductive wire material having a highly efficient heat generation characteristic is formed by braiding. To use.

In addition, since a large coil surrounding the entire body or the entire head has been used conventionally, a high power oscillator was required,
The present invention is characterized in that the coil to be installed in front of the mouth has a funnel shape, for example, when the treatment target is the mouth, in order to enable the use of a low power oscillator.

By using a non-magnetic metal such as a copper tape, a copper net, or a copper wire braid as the heating element, heating can be performed by generating an eddy current by a low frequency electromagnetic wave as described above. The above-mentioned amorphous material and other magnetic materials can utilize hysteresis loss, but have low electrical conductivity ρ. Since copper has a high ρ and a high thermal conductivity, a structure in which the eddy current loss is effectively used and the skin effect is utilized to the maximum, conversely, the conversion efficiency to heat is better than that of the magnetic body. The non-magnetic conductive wire is a metal composed of one or more of copper, aluminum, silver and gold, and the specific resistance of the metal is preferably 1 to 20 μΩcm at room temperature.

Example of Invention

(Example 1) FIG. 1 is a block diagram of a low-frequency heating treatment apparatus according to the present invention. 1 is a low frequency oscillator. The high-frequency heating method uses a frequency of 1 to 2450 MHz, while the low-frequency heating method uses a frequency of 10 to 100 kilohertz, and an electric power of 1 to 10 kilowatts is sufficient. Reference numeral 2 is a low-frequency oscillator circuit including a power supply circuit, 3 is a coil for living body application, which is also called an applicator, and 4 is a human body. For example, in the mouth, under the tongue, gums, cheeks, upper and lower jaws,
The heating element 5 is applied to the affected area in the mouth. The present invention does not require a cooling device such as a water circulation type. 6 is a thermocouple embedded in the heating element 5, 7 is its lead wire, 8 is a thermometer and amplifier,
Reference numeral 9 is an automatic temperature control circuit, 10 is its setting device, 11 is an output manual adjusting circuit, and 12 is its setting device.

FIG. 2 shows the treatment of tumors in the mouth. Select an approximate output according to the condition of the affected area and adjust the manual adjuster 12, set the automatic temperature control setting device 10 to an appropriate temperature of 43 to 45 ° C according to the affected area, and set the heater 5 to the tumor in the mouth. When the coil 3 is placed in contact with the patient and the coil 3 is applied to the vicinity of the chin, the heating element 5 made of a non-magnetic conductive material is generated by the alternating magnetic field generated by the coil 3.
Generates eddy current due to magnetic induction to generate heat, and heats the affected area at an appropriate temperature.

As the non-magnetic conductive material of the heating element, as shown in the table, a solid cylinder of copper, a hollow cylinder, a braided wire, a braided wire of Monel alloy, copper powder, aluminum powder, etc. were compared and examined.
The results are shown in the table. For the human body equivalent experiment, we decided to use agar phantom and keep it at 36.5 ℃, which corresponds to the body temperature, before heating. The heating oscillator used had a frequency of about 20 KHz and an output of about 1 kW. For temperature measurement,
Using a 0.1 mm diameter copper-constan thermocouple, we measured at the surface of the phantom and at a depth of 1,3,5 mm.
The measurement error when an electromagnetic field was applied was 0.2 ° C or less.
The heating element is a cylindrical impression material having a diameter of 30 mm, a height of 10 mm, and a volume of 7 cm ³ embedded in a dental impression material (silicon rubber). The average volume of the heating element used for treatment is 7 cm ³ . The heating time was 20 minutes, which was close to the treatment time.

The applicator coil used was a funnel-shaped coil that could be easily fixed to the chin and could obtain a high magnetic field in the affected area.

A magnetic field of 4,000 A / m or more was applied to the treatment, and the condition equivalent to this was that the distance from the coil to the heating element was 7 cm. As shown in the table, the non-magnetic material used was linear, string-like, granular or powdery. These materials were dispersed in silicone rubber to give a predetermined shape.

As shown in the table, the hysteresis loss cannot be used for non-magnetic materials, but if the device is devised so that the eddy current loss is sufficiently utilized with a low specific resistance, a temperature rise higher than that of magnetic materials can be obtained, as with copper wire braiding. I knew I could be done. The braiding is light and the workability is quite good.

(Example 2) A phantom experiment using a cylindrical coil was conducted in the same manner as in Example 1 by using a copper wire braid having the highest temperature rise and lowering the magnetic field. The magnetic field is 1,830 A / m, which is the strength of the magnetic field at the center of a cylindrical coil with a diameter of 230 mm that can be placed on the head and treated.
A funnel coil corresponds to a distance of 11 cm. The experimental results are shown in FIG. The temperature rises to 50.2 ℃ in 20 minutes, and treatment in low magnetic fields becomes possible.

Heating element using copper wire braid (0.2φ x 192) is 1,830 A / m
It was possible to heat up to 50.2 ℃ (20 minutes) even in a low magnetic field. This braid is light and can be processed into a heating element having a somewhat free shape.

(Embodiment 3) FIGS. 4 and 5 are a plan view and a perspective view showing an example in which a braid is formed using wires made of various non-magnetic materials.
Such a braid can be embedded and used by silicone rubber as shown in the above-mentioned embodiment.

〔The invention's effect〕

According to the present invention, a heating element having high heat generation efficiency can be obtained, and thus heating by a low-frequency oscillator can be performed with low power.

[Brief description of drawings]

FIG. 1 is an overall system diagram showing an embodiment of the present invention, FIG. 2 is a diagram for explaining application of an applicator coil and a heating element to a tumor in the mouth, and FIG. 3 is a copper wire braid. Diagrams showing the relationship between heating time and temperature, FIGS. 4 and 5 are plan and perspective views of various braids. 1 ... Low frequency oscillator, 2 ... Low frequency oscillation circuit, 3 ... Applicator coil, 4 ... Human body, 5 ... Heating element, 6 ...
Thermocouple, 7 ... Lead wire, 8 ... Thermometer and amplifier, 9 ...
… Automatic temperature control circuit, 10 …… Automatic temperature control setting device, 11
...... Output manual adjustment circuit, 12 …… Setter for output manual adjustment circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Kazuki, 3-10124, Hachinohe-mizo, Saga-shi, Saga (72) Inventor Naoki Kinoshita 3514, Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa (56) References Special Kai 56-11049 (JP, A)

Claims (3)

[Claims] 1. A low-frequency heating treatment apparatus comprising a coil for generating an alternating magnetic field by a low-frequency oscillator and a heating element heated by magnetic induction by the coil, wherein the heating element heats an affected part of a living body. The low-frequency oscillator emits a frequency of 10 to 100 kHz, the heating element is made of a non-magnetic conductive wire having a specific resistance of 1 to 20 μΩcm at room temperature, and is composed of a braid of the wire. Low frequency heating treatment device. 2. A low-frequency heating treatment device, wherein the non-magnetic conductive wire according to claim 1 is a metal composed of one or more of copper, aluminum, silver and gold. . 3. The low frequency heating treatment device according to claim 1, wherein the low frequency oscillation coil has a funnel shape.