JPH0698195B2 - Hyperthermia device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hyperthermia device that applies a high-frequency current to a diseased part inside a living body to perform thermotherapy on the affected part.

[Conventional technology]

As a conventional example of hyperthermia in which a high-frequency current is applied to a cancer affected area inside a living body to heat-treat the affected area, there is JP-B-58-8254. This is provided with a pair of antennas for flowing a high frequency and a power supply for supplying a high frequency current to the antenna. In the case of this method, the part near the antenna has the highest current density and the fat layer near the skin near this part causes high temperature near the skin. Means for cooling are attached. This cooling means is configured so that cooling water flows in the balloon.

Further, USP No. 4,350,168 discloses means for providing three pairs of electrodes and applying a phase shift between the three pairs of electrodes by one-third each to heat the affected area. ing.

[Problems to be solved by the invention]

However, the above-mentioned Japanese Utility Model Publication No. 58-8254 has a drawback in that the electrode portion is complicated and large in size because a large-scale cooling means is incorporated in the electrode (antenna) portion. Moreover, in this method, the electrode portion is too large to be inserted and installed in the body cavity.

On the other hand, in USP 4,350,168, three pairs of electrodes are provided, and a high frequency is applied only by shifting the phase between the three pairs of electrodes by one-third. It heats up as a thing. Moreover, when the phases are close to each other, the possibility that current will flow to the other electrodes that are divided increases, so that the number of pairs of electrodes is three. Therefore, each electrode has a strong tendency to generate heat as one substantially.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hyperthermia device which does not require a complicated cooling means for cooling an electrode portion and can form a compact electrode portion.

[Means and Actions for Solving Problems]

In order to solve the above problems, the present invention sandwiches a diseased part with a pair of electrodes, and in a hyperthermia device that heats and treats the diseased part by applying a high-frequency current between the electrodes, divides each of the electrodes into a plurality of pieces. The divided electrode parts are sequentially and selectively energized by a high frequency supply means at a constant cycle.

Since the divided electrode portions are selectively energized at a constant cycle, the specific electrode portion does not reach a high temperature and the heat is dispersed and radiated, so that no special cooling means is required.

〔Example〕

FIG. 1 shows a first embodiment of the present invention. The hyperthermia device of this embodiment has an extracorporeal electrode 2 to be brought into contact with the external surface of the human body 1 and an intracorporeal electrode 3 inserted and installed inside the human body 1. The body electrode 3 is provided at the tip of a flexible insert 5 that can be inserted into the body cavity 4 of the human body 1. Further, the extracorporeal electrode 2 and the intracorporeal electrode 3 are correspondingly divided into a plurality of electrode portions a to i, and the plurality of electrode portions a to i are arranged in a line. In addition,
The electrode parts a to i of the body electrode 3 are arranged at the tip of the insert 5 in the axial direction thereof.

In addition, the electric wires 6 are respectively connected to the electrode parts a to i of the extracorporeal electrode 2.
Are connected to the impedance matching box 8 via the first rotary switch 7.
Further, the respective electrode parts a to i of the in-body electrode 3 are also connected to the electric wires 9, and the respective electric wires 9 are connected to the second rotary switch 10
It is connected to the impedance matching device 8 via. A high frequency oscillator 11 is connected to the impedance matching device 8.

Further, in the first rotary switch 7 and the second rotary switch 10, each of the movers 12 and 13 thereof is the switch rotating unit 1.
4 are driven in synchronization with each other, and the corresponding fixed terminals 15 and 16 are sequentially selected at a constant cycle.

Next, a method of using the hyperthermia device having the above configuration will be described. First, the insert 5 is inserted into the body cavity 4 in the human body 1, and the in-body electrode 3 at the tip thereof is made to correspond to the affected area 17.
In addition, the body electrode 3 is arranged so that the affected area 17 is interposed therebetween.
The extracorporeal electrode 2 is fixed in contact with the outer surface of the human body 1 so as to be opposed to. In this case, the corresponding electrode portions a to i of the extracorporeal electrode 2 and the intracorporeal electrode 3 are positioned so as to be arranged in point symmetry with the affected area 17 as a point center.

Therefore, the movers 12 and 13 of the first rotary switch 7 and the second rotary switch 10 are connected to the switch rotating unit 14 respectively.
Are driven in synchronism with each other, and the corresponding fixed terminals 15 and 16 are sequentially selected at a constant cycle. Then, the corresponding electrode portions a to i are sequentially switched in each correspondence of, for example, a and a, b and b, c and c, ... Therefore, a high-frequency current flows between the energized electrode portions a to i as shown by the dotted line in FIG. 1, and the affected area 17 is located at these intersections, so that the affected area 17 is concentrated. To warm it up.

That is, the high frequency current density is applied to each of the electrode parts a to
Since the temperature of the affected part 17 is higher than that of i, the heat generation of the electrode parts a to i is smaller than the heat generation of the affected part 17, and the temperature is remarkably lowered, a large-scale means for cooling the electrode parts a to i is unnecessary. Become. Therefore, the structure of the electrode parts a to i can be simplified and downsized. Therefore, the portion of the in-body electrode 3 inserted into the body cavity 4 of the human body 1 can be miniaturized, and the pain of the patient can be reduced.

FIG. 2 shows a second embodiment of the present invention. In this embodiment, the pair of electrodes are both extracorporeal electrodes 2 and 2, and the electrode portions a to i of the extracorporeal electrodes 2 and 2 are arranged in point symmetry with the affected part 16 as a point center. Position. Others are the same as those in the first embodiment.

FIG. 3 shows a third embodiment of the present invention. In this embodiment as well, as in the second embodiment, the pair of electrodes are both the extracorporeal electrodes 2 and 2, but a waterback 20 is provided on one of the extracorporeal electrodes 2 (upper one in this embodiment). ,
The electrode parts a to i are cooled. In addition, a water bag 2 is attached to each of the upper and lower extracorporeal electrodes 2 and 2.
You may make it provide 0.

FIG. 4 shows a fourth embodiment of the present invention. In this embodiment, one of the electrodes is a body electrode 25 as in the case of the first embodiment, but the body electrode 25 is designed so that it can be moved along the longitudinal direction of the insert body 5 by using it as a guide. Has become. The in-body electrode 25 is connected to the wire 26 inserted through the insert body 5 and is moved by the wire 26. The base end side of the wire 26 is wound around an external pulley 27 and is wound up. Also,
The pulley 27 is connected to a first stepping motor 28 and is driven by this stepping motor 28.

Further, electric wires 29 are connected to the respective electrode portions a to i of the extracorporeal electrode 2 similarly to the first embodiment, and each electric wire 29 is connected to a high frequency oscillator 31 via a rotary switch 30. The mover 32 of the rotary switch 30 is connected to a second stepping motor 33, and is rotated by the second stepping motor 33.

The drive of the first stepping motor 28 and the second stepping motor 33 is controlled by a motor drive circuit 34.

The in-body electrode 25 is connected to the high frequency oscillator 31 by using the wire 26 inserted into the insert 5 as an electric wire for supplying current.

Therefore, in this embodiment, the power of the high frequency oscillator 31 is supplied to the external electrode 2 and the internal electrode 25 via the wire 26 and the rotary switch 30. Each electrode part a of the extracorporeal electrode 2
i is energized by the rotary switch 30 driven by the second stepping motor 33 for a fixed period of time. Further, in synchronization with this, the first stepping motor 28 operates to rotate the pulley 27 and wind the wire 26. As a result, the in-body electrode 25 is moved, and each of the electrode parts a to
i are sequentially located. That is, a high-frequency current flows between the in-body electrode 25 and the corresponding electrode portions a to i at the symmetrical position with the affected part 17 as the center. Therefore, the affected area
A high-frequency current constantly flows through 17 to intensively heat the affected area 17.

In other words, the in-body electrode 25 is moved by the stepping motor 28 so that it is positioned in correspondence with the divided electrode parts a to i of the extra-corporeal electrode 2 in order of point symmetry in each operation. However, it acts as the substantially divided electrode portions a to i.

In the above embodiment, the supply of high frequency power is switched using a rotary switch or the like, but the present invention is not limited to this, and a semiconductor switch may be used. In addition, a high frequency power supply for each electrode is provided individually,
The supply operation of each high-frequency power source may be switched. Further, the internal electrode may have a smaller number of divided electrode portions than the external electrode.

〔The invention's effect〕

As described above, the present invention sandwiches the affected area with a pair of electrodes,
In a hyperthermia device that heats and treats a diseased part by applying a high-frequency current between the electrodes, divides each of the electrodes into a plurality of parts and selectively energizes the divided electrode parts by a high-frequency supply means at a constant cycle. It was done like this.

Therefore, since the divided electrode portions are selectively energized in a constant cycle, the specific electrode portion does not reach a high temperature and the heat is dispersed and radiated, so that no special cooling means is required.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention, FIG. 2 is a configuration diagram of an electrode part showing a second embodiment of the present invention, and FIG. 3 is a third embodiment of the present invention. Configuration diagram of the electrode portion shown, the fourth
The drawing is a block diagram showing a fourth embodiment of the present invention. 1 …… human body, 2 …… external electrode, 3 …… internal electrode, 11 ……
High-frequency oscillator, 17 ... affected area, 25 ... internal electrode.

Claims (1)

[Claims] 1. A hyperthermia device for sandwiching an affected area between a pair of electrodes and applying a high-frequency current between the electrodes to heat the affected area for treatment, wherein each electrode is divided into a plurality of parts.
A hyperthermia device, characterized in that high frequency supply means for selectively energizing each of the divided electrode portions sequentially at a constant cycle is provided.