JPS59105464A - Electromagnetic wave generator for heat treatment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention The present invention relates to an electromagnetic wave generator used in thermotherapy, which irradiates cancerous tissue in the human body with electromagnetic waves and heats it to a predetermined temperature, thereby stopping the regenerative function of cancer cells and causing death. Related, Ru.

In recent years, heat treatment has attracted attention as being extremely effective in the treatment of ``#:-''), and efforts are being made to develop heat therapy that heats malignant tumors to a temperature around 43°C for the necessary time. .

For such thermal treatment, there are generally electric field heating methods that heat the human body by sandwiching it between a pair of electrode plates, M L9 heating methods that heat the human body by placing it in an electromagnetic coil, and electric field heating methods that heat the human body by placing it in an electromagnetic coil.
71F is an electromagnetic wave heating method that radiates K-waves to the human body to heat it.
＋? ), 7 [With field and induction heating methods, spot heating that intensively heats only 1 m of cancer within the body is difficult.
Because of this, it is used to heat a fairly wide area of the human body.On the other hand, with electromagnetic waves, it is possible to focus the electromagnetic waves, so it is possible to heat only the area near the cancerous tissue. It is being considered for use in heating.

By the way, heat therapy is performed using electromagnetic waves! Inquiry,
The most basic type of component is an electromagnetic wave generator as an element for applying microwave L energy to a living body, and this TL is also generally called an applicator.

As this electromagnetic wave generator, an electromagnetic horn shown in FIG. 1 has conventionally been used. In Fig. 1, an electromagnetic horn 1 t
; L > 9 Consists of a power feeding unit 3 provided with a wave tube connector 4 and a horn 2 that radiates microwave energy, the horn 2
As shown in FIG. 2, a high dielectric material 5 is loaded inside the device to ensure matching with the human body.

This high-permittivity material 5 is made of a high-permittivity material with a relative permittivity that is almost the same as that of the human body, and matching with the waveguide provided in the power feeding section 3 is achieved by using the high-permittivity material 5. This is achieved by creating the tapered shape shown in the figure.

FIG. 3 is an explanatory diagram of thermotherapy using a conventional electromagnetic horn 1, in which a cooling water film 7 is provided between the electromagnetic horn 1 and the human body 6.
By irradiating the cancer 11#1li8 with microwaves and heating the cancer phase 8B to around 43° C. for the necessary time, the cancer cell regeneration function is lost and a cell killing effect is obtained.

However, the disadvantage of conventional electromagnetic wave generators using electromagnetic horns is that unless the operating frequency is set to 2Gl-tz or higher, the size of the electromagnetic horn becomes inconvenient for transmitting electromagnetic waves to the human body. Therefore, by using the frequency of 2,45Gl-1z, which has been allowed to be used for medical purposes, it is possible to achieve the standardization.

However, the penetration of electromagnetic waves into the human body becomes shallower when the frequency is higher, and in 2', , 45 GH7, the surface layer of the human body is severely damaged and heating is only possible to a depth of about 2 CIH.

Of course, if the frequency used is lowered, e.g. 434M l-
It is possible to limit the depth that can be heated, such as about 5 cm in lz, but as mentioned above, in the megahertz order (
The electromagnetic horn became extremely large, and it was an office job to put it to practical use as a steaming device that prevents electromagnetic waves from entering the human body.

The present invention (15) was made in view of these conventional problems, and is a mega l\\ that allows electromagnetic waves to sufficiently penetrate the human body.
It is an object of the present invention to provide an electromagnetic wave generator for thermotherapy that can be used at a frequency of 100 Hz and is sufficiently miniaturized for medical treatment.

To achieve this objective, the present invention proposes the reverse use of the dielectric antenna used for communication, that is, the radiation effect chamber for external electromagnetic waves is reduced as much as possible to reduce the radiated energy to the dielectric antenna. Based on the method of sealing it inside the body,
An excitation antenna 114 is installed inside a columnar dielectric material having a dielectric constant approximately equal to that of the human body and having a dielectric constant formed on one end.
It is designed to concentrate and radiate electromagnetic energy to the human body by exciting it at a frequency of 500 MHz or less using a power supply line drawn out to the outside of the 41-shaped dielectric.

Hereinafter, embodiments of the present invention will be explained based on the drawings.

FIG. 4 is a perspective view showing an embodiment of the present invention.

First, to explain the configuration, 10 is a columnar dielectric body with a circular cross section, and one end forms a radiation surface 12 for radiating electromagnetic wave energy to the human body, and the opposite side to the radiation surface 12 A loop antenna 14 is enclosed within the columnar dielectric 10 as an excitation antenna, and a pair of feed lines 16 are drawn out from the loop antenna 14. Here, the 11-shaped dielectric body 10 is made of a dielectric material having a dielectric constant εr that is approximately the same as that of human tissue, and the effective dielectric constant of human silk tr& is extremely high, ε-80.
Since the diameter is 100 m, the rectangular dielectric 10 is made of a dielectric material with a dielectric material of εr = 80, for example, which is equal to 13L to the dielectric constant of this human tissue.

Of course, (the one-shaped dielectric 10 has a culm rσ almost equal to human tissue)
The pressure tube II is rotated clockwise and a dielectric material with low dielectric loss is used.

-8. Loop reed 1' enclosed in columnar dielectric 10
)14 efficiently transmits electromagnetic waves under 500Ml-1zJx (
The mono-shaped dielectric 10 is used as a dielectric waveguide to transmit electromagnetic waves to the human body with excitation characteristics 110, and the size of the loop antenna 14 is a popular antenna used in a frequency band of 500 M'l-IZ or less. For the size of a communication loop antenna installed in
This can be achieved with a size of 9.

Furthermore, since the frequency used is less than 500 Mt-1z, the excitation signal is supplied to the loop antenna 14 by the feeder line 16 through a matching circuit using a coaxial/7-pull feeder. This is done by connecting to 1G.

Next, the present invention will be explained in detail.

The electromagnetic waves harmonized by the excitation of the loop antenna 14 enclosed in the columnar dielectric 10 are divided into electromagnetic wave energy that propagates inside the T11-shaped dielectric 10 and enters the human body, and the dielectric 10J.
, is the electromagnetic wave energy radiated to the outside, and the relationship between the two is shown in the characteristic graph of FIG.

In other words, Fig. 5 shows the ratio of the radiated power Wi inside the dielectric to the dielectric constant εr and the radiated power WO radiated to the outside of the dielectric with the diameter of the columnar dielectric as the horizontal axis. In dielectric antennas for communication, the radiation power ratio W can be reduced by reducing the relative dielectric constant εr of the dielectric used.
Although r/WO is set to be less than 1, in the present invention, the relative dielectricity of the columnar M electric body 10 is 5 (εr = 80, which is extremely high, so even if the diameter of the +1-shaped dielectric body is the same, the radiation power ratio Wi
/WO°, 1q is increased by 10·-20, and the radiation power Wi propagating in the t↑-shaped dielectric 10 is
The radiated power WO during the more popular period is 1/10~1
The radiation power is suppressed to an extremely small amount of 20 lq, and most of the energy from the loop ann 7 and 14 propagates within the columnar dielectric 10 and enters the human body from the radiation surface 12.
1 will be given.

Furthermore, to explain hY■I, the input 131 force of electromagnetic waves perpendicular to the interface between the columnar dielectric 10 and the air from the loop antenna 14 inserted into the +1-shaped dielectric 10 is Pl, the columnar dielectric 10 If the transmitted power transmitted from the dielectric 10 into the atmosphere is PL, and the inverse o1 power reflected at the interface and returned to the columnar dielectric 10 is Pr, the following relational expression holds.
'7, 1 (where εa is the dielectric constant of air (ε・1)
That is, if the dielectric constant εI'' of the columnar dielectric 10 is 80, then P i / P t -0, 7988, and the loop antenna 14 (at the interface between the 1-shaped dielectric 10 and air!1'! White) However, only about 20% of the electromagnetic waves are radiated to the outside at the entrance JL, and the remaining 80% is emitted from the flaky dielectric 1.
0, the electromagnetic wave from the loop antenna 14 is incident perpendicularly to the interface between the columnar dielectric 10 and the air in a very small part μ, and in other parts the angle of incidence is less than 90 degrees. Since it is incident at a sword angle, the radiated power to the outside of the columnar dielectric 10 becomes even smaller, and approximately 90% or more of the electromagnetic wave energy radiated from the loop antenna 171 is transmitted into the columnar dielectric 10. It can be contained.

On the other hand, when performing thermal treatment on a human body using the electromagnetic wave emitting device of the present invention shown in FIG. 4, a cold 7. Electromagnetic waves enter the human body through a water film for II! However, since the dielectric constant εW of water is εw = 80.7, which is approximately equal to the dielectric permittivity fεr of the +1-like dielectric 10, the interposition of the water film has a t, Mouth: [The loop antenna 'LIJ' inside the human body can concentrate the radiated electromagnetic wave energy and dissipate it, and the excitation frequency can be kept below 500 Ml-17, so it can be used as a loop antenna inside the human body. The electromagnetic wave energy can penetrate to a sufficient depth inside the body to tIn rm the cancer tissue, and in addition, the electromagnetic wave that enters the human body:
Since the beam characteristics are determined by the shape of the radiation surface 12 of zero, it is possible to spot-crystallize Wt silk fabric, which requires heating.

Each of Figures 6.7 and 8 is used in the electromagnetic wave generator of the present invention! A cross-sectional view showing another example of the 11-shaped dielectric 10 (
In the case of the columnar electric tree 10 having a circular cross section as shown in FIG. [In order to reduce the propagation mode of electromagnetic waves propagating through one body 1o, a columnar dielectric body 10 with a circular cross-sectional shape as shown in FIG. The dielectric material 10 is preferably a columnar dielectric material 10 having a polygonal cross section such as an octagon as shown in FIG.

In addition to the loop 77 antenna 14 shown in FIG. 4, the excitation antenna that can be inserted into the columnar dielectric 1o includes the guibor antenna 8 shown in FIG. 9, and the pair of electrode plates 2o shown in FIG. A plate-shaped antenna that encapsulates the antenna, and a corner reflector 2 in the form of a flat reflector bent in two as shown in Fig. 11.
It is possible to use any one of the corner riff 1 nocta antenna which is a combination of the 2 and the Gui ball antenna 18, the folded antenna 24 shown in Fig. 12, and the helical antenna 2G shown in Fig. 13. ) 7 nana (loop in Figure 4) 7 n f b 14 Similarly, the i-
Ripples 1/[Columnar dielectric material 10 with the size of the shore
is sealed inside.

The excitation antenna is not limited to the antennas shown in Figures 9 to 13, but can be any suitable antenna that can be used in the 100 to 1000 Ml-17 range. antenna can be used.

In addition, as an excitation antenna confined in an 11-shaped dielectric 10, η
- means that the columnar dielectric 10 is made of a high dielectric material. 1) It is possible to sufficiently confine the radiated electromagnetic waves within the columnar dielectric 10 even if the antenna is in the opposite direction 1'l. Emit electromagnetic waves intensively in a predetermined direction ・1? An excitation antenna with directivity is used.

Next, to explain the present invention in detail, 500 M l-17
Because it uses electromagnetic waves with the following frequencies, electromagnetic waves can penetrate even deep cancer tissues within the human body.
! It can be heated by

Furthermore, since the excitation antenna is sealed inside a +1-shaped dielectric material that has a dielectric constant almost equal to that of the human body as an electromagnetic waveguide, the size of the excitation antenna is 1/r7c of the popular size. 'T can be expressed as the size of T, and even if the operating frequency is lowered to 500 MHz or less, the excitation antenna can be made sufficiently small, so the t3-ise of the columnar dielectric, which is determined by the size of the excitation antenna, can also be made sufficiently small. It is extremely easy to handle as a medical electromagnetic waveguide, and has been used as an electromagnetic wave generator for 7 small helicopters.

Furthermore, the columnar dielectric material through which the electromagnetic waves from the excitation antenna propagate is made of a dielectric material with a relative permittivity that is exactly the same as that of human tissue, so there is no reflection loss at any contact point in the human body. is extremely small, and the excitation antenna J:
- Most of the energy can be directed into the human body in the form of a beam, achieving extremely high radiation efficiency.

Furthermore, the electromagnetic waves incident on the interface between the columnar dielectric and the air are not radiated into the air (the inside of the single-layer dielectric When electromagnetic waves are trapped in the IJ, 500 M
l-(For frequency bands below 7, use medical binding (#)
Although J and I■ have not been achieved, since the electromagnetic wave energy 1'F:L leaking to the outside from the electromagnetic wave generator of the present invention is extremely early, it is necessary to prevent communication damage due to leakage of electromagnetic waves. The amount of shielding equipment required is minimal, and it is possible to sufficiently suppress the occurrence of radio wave interference in equipment for medical facilities.

[Brief explanation of the drawing]

Figure 1.2 is an explanatory diagram showing a conventional electromagnetic wave generator, Figure 3
Figure IJ, explanatory diagram of heat treatment using a conventional electromagnetic wave generator,
FIG. 4 is a perspective view showing one embodiment of the present invention, FIG. 5 is a graph showing the radiated power ratio Wi/WO of the dielectric antenna, and FIGS. Cross-sectional views showing other embodiments of columnar dielectrics, Nos. 9.10 and 11.12
13 are explanatory diagrams showing other embodiments of the excitation antenna used in the present invention. 10: Column dielectric 12': Emitting surface 14: Lube antenna]-16: Feed line 18: Daiball amplifier 7 20: Electrode plate 22: Corner reflector 24: Folded amplifier 26: Helino J Le antenna special π' [Applicant Co., Ltd. Ne1 Higashi 314 F:'l Agent Patent Attorney Jurisdiction Susumu Figure 3 Figure 4 Figure 5 Previous Figure 6 Figure 7 Figure 1o) Figure 8

Claims (1)

[Scope of Claims] (1) A columnar dielectric having an electromagnetic radiation surface formed at one end, an excitation antenna sealed inside the columnar dielectric;
1. An electromagnetic wave generator for thermotherapy, characterized in that the electromagnetic wave generator comprises a feed line for the excitation antenna drawn out of a single dielectric body. (2) The electromagnetic wave generator for thermotherapy according to claim 1, wherein the columnar dielectric has a relative permittivity approximately equal to the relative permittivity of human tissue. (3) The electromagnetic wave generator for thermotherapy according to claim 1, wherein the T1-shaped dielectric has a circular, oval, elliptical, or polygonal cross-sectional shape. (/I) The electromagnetic wave generator for thermotherapy according to claim 1, wherein the excitation antenna is an antenna excited by ultra-high frequency waves and/or ultra-high frequency waves. (5) The excitation antenna is an antenna excited at a frequency of 500 M 1 to 17 or less.
Electromagnetic wave generator for hyperthermia therapy as described in . (6) The electromagnetic wave generator for thermotherapy according to claim 1, wherein the excitation antenna is a linear antenna such as a dipole, loop, or helical antenna, or a plate antenna using a pair of electrodes.