JPS6139066B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hyperthermia device, and particularly to a hyperthermia device that performs heating treatment by irradiating radiation waves to affected tissue in a living body.

Technical background Microwaves are irradiated to the affected tissue (e.g. cancerous tissue) in a living body, and the temperature is heated to a predetermined temperature (e.g. around 42 to 45 degrees Celsius), and this is done continuously or intermittently. A hyperthermia device is well known that treats affected tissue by using
Only the desired affected tissue can be treated.

The hyperthermia device described above is based on the following operating principle.

In other words, generally when a dielectric is placed in an alternating electromagnetic field in a predetermined frequency range, the dielectric is heated due to dielectric loss, but hyperthermia devices utilize this dielectric loss to perform heating treatment on the affected tissue. It is something.
Cancer tissues have a higher dielectric constant than other normal tissues, and are known to have poor thermal conductivity.As a result, irradiation with microwaves at a certain frequency in living organisms can damage normal tissues. It is possible to selectively heat treat only the cancerous tissue without any cancerous tissue.

Conventional technology Conventionally, in order to concentrate microwaves and reduce temperature unevenness in the affected tissue, multiple (3 to 6) spherical irradiators were provided, and each irradiator irradiated the affected tissue with microwaves. However, the problem was that it was difficult and time-consuming to adjust the irradiation angle of each irradiator.

In addition, in normal cases, microwaves are irradiated to the affected tissue from an applicator that includes an irradiator, but at this time, a cooling matching device is placed between the applicator and the body surface, and for example, cooling water is filled. A water bag or the like was used as this cooling matching device to prevent local overheating of the body surface and to match the distribution of the irradiated microwave dose according to the shape of the predetermined affected area. However, in the conventional device, in order to effectively exert the local overheat prevention effect of the cooling matching device, it is necessary to provide a cooling liquid supply device that circulates a cooling liquid such as cooling water to the cooling matching device. A cooling liquid inlet and an outlet must be provided on the side of the cooling matching device, which has the disadvantage of complicating the device.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to enable accurate and easy adjustment of the irradiation angle of the irradiator in a short time, and to provide a simple structure for adjusting the cooling liquid. An object of the present invention is to provide a hyperthermia device capable of stirring.

Structure of the Invention In order to achieve the above object, the present invention includes a holding arm that rotates around a base axis that passes through a heated part, and a heated target on the base axis that is provided at a position offset from the base axis of the holding arm. at least one irradiator that irradiates the irradiation wave to the part, and the part to be heated at the intersection of the base axis and the irradiation direction is locally heated by rotation of the irradiator. .

Embodiments Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

The figure shows a preferred embodiment of the hyperthermia device according to the present invention. and a cooling matching device 14 disposed between the applicator 10 and the body surface 12 in order to match the distribution of the irradiated microwave dose according to the shape of the predetermined affected area.
It is equipped with.

The applicator 10 has a holding arm 20 disposed on the base axis 18 passing through the heated portion, that is, the cancerous tissue 16, and the holding arm 20 is connected to the housing 2.
It is rotatably supported by a bearing 24 provided at 2. A motor 26 is provided to rotate the holding arm 20, and a driving pulley 28 fixed to the drive shaft of the motor 26 and a driven pulley 30 fixed to the circumference of the holding arm 20 are provided with a driving belt 3.
2 is hung.

The holding portion 34 of the holding arm 20 includes a base shaft 1
One irradiator 36 is located at a position offset from the shaft 38.
It is fixed so that it can rotate by a predetermined amount about the axis. In order to supply irradiation power to the irradiator 36, slip rings 40a and 40b are fixed to the upper peripheral surface of the holding arm 20. Brushes 42a, 42b are brought into contact with the outer peripheral surfaces of each of the slip rings 40a, 40b with a constant pressing force, and the slip rings 40a, 40b and the irradiator 36 are connected to a lead wire 44a, which passes through the inside of the cylindrical holding arm 20. It is electrically connected by 44b.
Therefore, as described later, the irradiator 36 is connected to the motor 2.
6, the microwave 100 is irradiated while rotating around the base axis 18, and the base axis 18 and the microwave 1
A heating treatment is performed on the area to be heated, that is, the cancer tissue 16 located at the intersection with the irradiation direction of 00.

Further, the cooling matching device 14 has a water bag (or water tank) 50 filled with cooling water 48, and the water bag 50
The lower surface of is tightly fixed to the body surface 12. In addition to the cooling effect of the cooling water 48, the stirring effect caused by the rotation of the holding portion 34 of the holding arm 20 and the irradiator 36 can prevent the body surface 12 from being locally overheated. Furthermore, cooling water 48
By performing impedance matching for the microwave 100, the dose distribution of the microwave 100 irradiated to the cancerous tissue 16 can be maintained at a constant value.

The embodiment of the present invention has the above configuration, and its operation will be explained below.

First, the water bag 50 of the cooling alignment device 14 is tightly fixed to the body surface 12 on the upper surface of the cancerous tissue 16, and then the holding arm 20 of the applicator 10 is placed on the base shaft 18 passing through the cancerous tissue 16. Then, the irradiator 36 is rotated to adjust the irradiation angle, and the microwave 100
Adjust and fix so that the cancer tissue 16 is irradiated accurately. In this manner, in this embodiment, by rotating and adjusting one irradiator 36, the irradiation angle of the microwave 100 can be easily and quickly adjusted.

Next, while rotating the irradiator 36 around the base shaft 18 by the motor 26, power for irradiation is applied to the brush 42.
a, 42b, slip rings 40a, 40b, and lead wires 44a, 44b to the irradiator 36, and the cancerous tissue 16 is irradiated with the microwave 100. At this time, the holding part 34 of the holding arm 20
By the rotation of the irradiator 36, the cooling water 48 in the water bag 50 is stirred, the temperature of the cooling water 48 is kept uniform, and the body surface 12 can be prevented from being locally overheated.

Then, by rotating the irradiator 36, the cancerous tissue 16 is uniformly irradiated with the microwave 100, and as a result, the cancerous tissue 16 is uniformly heated due to dielectric loss. Then, by heating the temperature of the cancer tissue 16 to about 44°C and maintaining this state for about 30 to 90 minutes, only the cancer tissue 16 can be selectively attacked without damaging the normal tissue in the path of the microwave 100. can be treated.

As described above, in this embodiment, by rotating one irradiator 36, the microwave 100
Since the irradiation angle can be adjusted, the microwave 100 can be accurately and easily positioned toward the cancer tissue 16 in a short time.

Further, in this embodiment, the rotation of the holding part 34 of the holding arm 20 and the irradiator 36 causes the water bag 50
The cooling water 48 inside is stirred, and like the conventional device,
body surface 12 without circulating cooling water 48.
can prevent local overheating. Therefore, the device of this embodiment does not need to be provided with a cooling liquid supply device unlike the conventional device, and the cooling water 48 is not provided in the water bag 50.
There is no need to provide an inlet and an outlet, which simplifies the device.

Modification Example In the embodiment described above, the microwave 100 is used as the irradiation wave, but the irradiator 3
It is also possible to use an ultrasonic transducer as 6 and to irradiate ultrasonic waves.

Effects of the Invention As explained above, according to the present invention, since the part to be heated at the intersection of the base axis and the irradiation direction is heated by the rotation of the irradiator, the irradiation angle of the irradiator is The alignment can be performed accurately and easily in a short time, and the cooling liquid can be stirred with a simple configuration to prevent the cooling liquid from rising locally.

[Brief explanation of the drawing]

The figure is a sectional view of a main part showing a preferred embodiment of a hyperthermia device according to the present invention. 16... Cancer tissue, 18... Base axis, 20... Holding arm, 34... Holding section, 36... Irradiator, 10
0...Microwave.

Claims (1)

[Claims] 1 A holding arm that rotates around a base axis that passes through the heated part, and at least one irradiation unit that is provided at a position offset from the base axis of the holding arm and irradiates the heated part on the base axis with an irradiation wave. 1. A hyperthermia device comprising: a device for locally heating a heated part at an intersection of a base axis and an irradiation direction by rotating the irradiator.