JPH0364B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-frequency heating treatment device that dielectrically heats abnormal cell tissue in a living body from outside the living body to cause necrosis and collapse.

[Prior art]

If abnormal cell tissue, which is cancer or other tumor, and surrounding normal cell tissue are both heated in a temperature range of 40℃ or higher, only the former will become about 1 to 2℃ hotter than the latter. We focused on heating the living body, taking care to keep it in a temperature range of 42°C or lower that does not cause necrosis or other effects on normal cell tissues, and raising only the abnormal cell tissue to a temperature of around 43°C. A method of attempting necrosis and collapse of the abnormal cell tissue and curing the affected area of cancer, etc. is known as so-called hyperthermia therapy.

When performing such heating treatment, if the affected area is on the surface of the body, an incandescent lamp or the like may be used as the heat source, but if the affected area is deep inside the body, dielectric heating may be used. A high-frequency heating treatment device is used (for example, see Japanese Patent Publication No. 58-30063 and Japanese Utility Model Publication No. 59-37259). That is, in this device, as shown in FIGS. 5 and 6, two heating electrode bodies 1, which are high-frequency electrodes, are connected to a high-frequency generation source 3 via individual cords 2. On the other hand, the electrode bodies 1, 1 are attached to the surface as close as possible to the affected area 5 of the living body so as to sandwich the deep affected area 5 from both sides. The electrode body 1 is integrally provided in the upper part of the pad 6 filled with distilled water, so that the electrode body 1 can be easily attached along the surface of the living body. In FIG. 6, 7 and 7' are drain ports of the electrode body equipped pad 6.

[Problem that the invention seeks to solve]

By the way, in the above-mentioned high-frequency heating treatment device, the operation of the high-frequency generation source 3 generates high-frequency energy between the two electrode bodies 1, which face each other substantially in parallel with the living body 4 sandwiched between them. Electric field like 8
occurs, and the living body 4 is heated by induction heating, but in particular, the surface layer of the living body around the electrode body exposed to this electric field, that is, the subcutaneous fat layer region 9 as shown in FIG. 6, is strongly heated. Since the surface area of the body outside this area is not heated, the patient becomes acutely aware of the amount of heat applied to the body 4 due to the temperature difference, and as a result, the patient is mentally pressured due to anxiety and discomfort. That's what happens.

In particular, on the end side of the electrode body 1 shown by arrow A in FIG. As is clear from the temperature distribution diagram based on the experimental results in Figure b shown below corresponding to Figure A, the temperature is locally excessive near the ends compared to the middle area. Therefore, the high-frequency voltage applied to the electrode body 1 is applied at a heating temperature of 42°C for normal cell tissue.
Even if the temperature is adjusted to be below, the temperature in the above-mentioned local area will rise more than that, and the biological stimulation will become intense, causing pain to the patient.

In addition, the above distribution map uses a phantom agar (0.4% NaCl) formed in a slightly horizontally elongated approximately elliptical shape as the target object, and the temperature before heating is set at 21.4°C, and the temperature inside the pad 6 is set at 21°C. However, the electrode body used was 18 cm wide, and the results were measured at a depth of 0.5 cm from the surface when heated for 3 minutes with an RF output of 850 W. According to this, the end part is larger than the middle part. My
The temperature rises by 1.5 to 2.5 degrees Celsius.

Furthermore, the part of the biological surface to which the electrode body 1 is attached by the pad 6 is not always flat;
Sometimes it has an uneven shape as shown in the figure.
If there are such irregularities, the distance between the electrode body 1 and the living body surface changes so that there is a difference between d ₁ and d ₂ in the figure, and the distance between the electrode body 1 and the surface of the living body changes in the bulged part.
Because _d2 is short, the warming effect is strong and weak in the opposite area, causing variations in the living body heating temperature, which naturally impairs the heating treatment effect.

In view of the above points, the present invention aims to provide a high-frequency device that prevents local heating of the subcutaneous fat layer of the living body, relieves patient pain, and makes the heating treatment effect effective by uniformly heating the living body. The present invention provides a heating treatment device.

[Means to solve the problem]

The present invention is constructed by integrally providing an electrode body made of a rigid metal plate having a substantially flat shape on the upper part of the anti-junction side in a pad made of an insulating material filled with distilled water or physiological saline. A flexible cooling pad made of an insulating material is provided between the pad with an electrode body and the living body, the pad having a size such that the periphery protrudes outward by at least an amount equivalent to the thickness of the pad from the periphery of the pad with an electrode body. intervene,
This high-frequency heating treatment device is characterized in that physiological saline is circulated and supplied into the cooling pad so that the entire pad has an appropriate thickness.

[Effect]

The above-mentioned device of the present invention places a pair of electrode body-equipped pads on a living body, each with a cooling pad interposed above the living body, with the internal electrode bodies facing approximately parallel to each other, and placed in a deep part of the living body. When placed between the cooling pads, each of the pads is filled with physiological saline, so even if the surface of the cooling pad is not flat, the surface of the cooling pad that comes into contact with the living body bends and deforms, causing it to rise up. This allows the electrode bodies to be kept substantially parallel when used. The amount of heating heat applied to the subcutaneous fat layer on the surface of the body is carried to the outside by the saline warm water flowing through the cooling pad.
For this reason, the body surface region directly under the electrode body, which is strongly heated, is smoothly cooled, the temperature difference in the body surface layer is reduced, and stimulation to the patient is suppressed. The area of the cooling pad is made larger than the area of the pad with the electrode body by at least an amount equivalent to the thickness of the pad. If the area is wide enough to cover almost half of the surface of the living body, the amount of heat received from the living body can be further increased.

In addition, the electric field whose edge effect is concentrated at the end of the electrode body is dispersed by passing through a cooling pad with a certain thickness, which prevents localized overheating of the biological surface layer. Alleviate the patient's pain by

Furthermore, the thickness of the cooling pad moves the electrode body away from the living body surface, reducing the ratio of the difference in distance between the concave part and the convex part of the living body surface, so that the heating energy applied to the living body becomes uniform, and the Suppress variations in heating temperature.

〔Example〕

Hereinafter, one embodiment of the present invention will be described using FIGS. 1 to 4.

In Figures 1 and 2, the pad 6 with the electrode body is made of the same material and has the same configuration as those shown in Figures 5 and 6, and is, for example, a bag made of a sheet or film of a soft synthetic resin such as vinyl. The inside of the pad is filled with distilled water or saline warm water, and the electrode body 1 provided in the upper part of this pad is formed of a rigid metal plate having a substantially flat shape and having excellent conductivity, such as copper. is covered with an insulating material 10 made of the same material as the pad 6.

Reference numeral 11 denotes a cooling pad interposed between the electrode body equipped pad 6 and the living body 4, and the area of the pad 11 on the side where the living body is attached is as large as the area of the living body 4, as shown in FIG. At least the area equivalent to the thickness of the pad 11 is larger than the area of the electrode body equipped pad 6 so that almost half of the circumference of the surface can be covered, and the peripheral edge of the pad 11 is made to protrude outside from the peripheral edge of the upper pad 6. It is attached to the surface of the living body 4 in this state. However, this cooling pad 11 is made of a bag made of an insulating and flexible material similar to that of the electrode body equipped pad 6 so that it can be tightly attached to the surface of the living body, and the inside contains physiological saline warm water cooled to 10°C or less. 1
4 is injected from the water inlet 12, while the water is injected from the water outlet 13.
The cooling pad is given a certain thickness by draining the cooling pad and allowing the saline to flow within the bag. Incidentally, it goes without saying that the electrode body 1 is connected to a high frequency generation source.

In the above device, a cooling pad 11 is applied to a living body part having an affected area 5, and a pair of electrode body-equipped pads each having an electrode body 1 are attached thereon in a substantially parallel facing state. When a high frequency voltage is applied, the biological surface region 9 relative to both electrode bodies 1, 1 is heated by the induced energy of the electric field magnetic flux passing through it, and the surface region outside this region is not heated, so this temperature difference causes As a result, the patient becomes conscious of the heat in the heated surface area, but since the physiological saline 14 is constantly flowing within the cooling pad 11 that is in direct contact with the body surface, the heated surface area 9 The amount of heat is absorbed by the physiological saline 14 and carried out to the outside of the cooling pad 11, and the thickness of the pad 11 is larger than the area of the electrode body equipped pad 6, so that the periphery of the pad 11 protrudes outside. As a result, the heat receiving space is enlarged, and heat removal from the above-mentioned heating surface layer region 9 is favorably promoted, and the heating surface layer, that is, the subcutaneous fat layer, is effectively cooled (temperature lowered). As a result, there is little temperature difference between the body's surface layers, and stimulation to the patient is drastically reduced, causing feelings of anxiety and
Discomfort is dispelled.

In addition, the electric field density at the end of the electrode body 1 increases due to the edge effect as mentioned at the beginning, but the electric field magnetic flux at this part increases due to the cooling pad 1 as shown in Fig. 3a.
When passing through 1, it expands, and the 7th
As is clear from the temperature distribution diagram in Figure 3b, which corresponds to Figure 3a and was obtained under the same conditions as Figure b, concentration of the electric field at the biological surface region corresponding to the end of the electrode body is avoided. As a result, the temperature at the end portion is slightly lower than that at the middle portion, and the surface layer of the body is not locally overheated.

Furthermore, the surface of the living body 4 is not necessarily flat;
Irregularities occur in the body part due to bone structure, etc., and the cooling pad 11, which directly contacts the surface of the living body, closely adheres to these concave and convex portions with its flexibility. In this case, the distance from the electrode body 1 to the biological surface reaches the recess as shown in Figure 4.
Naturally, there is a difference between d ₃ and d ₄ that reaches the convex portion, but the ratio of this difference to d ₁ and d ₂ is the same as that of the electrode body without the cooling pad 11 as in the conventional example shown in Fig. 6. −
It is smaller than the ratio to the distance of the biological surface. This means that the distribution of induced energy (electric field strength distribution) acting on the living body 4 by the electrode body 1 has smaller variations when there is a cooling pad than when there is no cooling pad. In other words, the smaller the ratio occupied by the difference, the smaller and negligible the variation caused by the distance difference, and the more accurate heating treatment can be applied to the affected area 5.

〔effect〕

As detailed above, according to the present invention, cooling of the subcutaneous fat on the surface layer of the patient's body is effectively promoted through the intervention of the cooling pad, and by avoiding local heating, It can relieve patient discomfort, anxiety, and pain during heating treatment. In addition, by uniformly heating the living body, it has become possible to perform heating treatment accurately according to the settings.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention, with Figure 1 being a schematic diagram of a high-frequency heating treatment device, Figure 2 being an enlarged cross-sectional view of the main parts thereof, Figures 3a and b, and Figure 4. These are a temperature distribution diagram and a cross-sectional view of the electric field for explaining the heating effect. Figures 5 to 7 show the conventional device, Figure 5 is a schematic diagram, Figure 6 is an enlarged cross-sectional view of the main part, and Figures 7a and b are temperature distribution diagrams in the electric field to explain the heating effect. It is. 1... Electrode body, 4... Living body, 5... Affected area, 6...
... Pad with electrode body, 11 ... Cooling pad, 1
4...Physiological saline.

Claims (1)

[Claims] 1 A device that applies high frequency voltage between a pair of electrode bodies attached approximately parallel to each other to sandwich a living body to perform heating treatment on the affected part of a living body, and is made of an insulating material filled with distilled water or physiological saline. In a pad equipped with an electrode body, which is constructed by integrally providing an electrode body made of a rigid metal plate having a substantially flat plate shape on the upper part of the opposite side of the pad, this electrode body is placed between the pad and the living body. A flexible cooling pad made of an insulating material is interposed so that at least an amount equivalent to the thickness of the peripheral edge protrudes from the peripheral edge of the equipped pad, and physiological saline is circulated and supplied into the cooling pad. A high frequency heating treatment device characterized in that the entire pad has an appropriate thickness.