JPH0450024B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary chair for a linearly accelerated irradiation device, which allows radiation therapy to be performed while a patient is in a comfortable sitting position.

In recent years, for example, instead of treating affected areas such as tumors or arteriovenous malformations (hereinafter, in this specification, the affected area to be treated with radiation is simply referred to as the affected area) by surgery, ionizing treatments such as x-rays and gamma rays have been introduced. Progress has been made in treatments that chemically alter cell tissues in affected areas by irradiating them with radiation (hereinafter, all ionizing radiation used for treatment will be simply referred to as radiation).

[Conventional technology]

For example, brain tumor treatment was performed by locating the tumor using a CT scan while the patient was lying in bed, and then irradiating the affected area with radiation. Since radiation also destroys cell tissue in areas other than the affected area, the linearly accelerated irradiation device was moved in a fan-shape in a vertical plane to reduce the impact of the radiation dose on cells outside the affected area. Then, the radiation from the linearly accelerated irradiation device is applied to the patient's affected area once every day.
The treatment used was to chemically alter the cell tissue in the affected area by irradiating the area for 2 to 2 minutes and repeating this for several weeks.

If the center position of the affected area does not coincide with the rotation center of the linearly accelerated irradiation device, the radiation irradiation area will be inaccurate, which may cause damage to tissues other than the affected area.

Therefore, even the slightest deviation is not allowed between the position of the affected area when scanned by CT and the position of radiation irradiated by the linear acceleration irradiation device after lying in bed.

[Problem to be solved by the invention]

Even if the bed is moved in a pendulum-like manner in a horizontal plane around the patient's lesion, rotating the bed around the patient's lesion not only requires a large amount of space, but also poses problems in the accuracy of rotation. Ta. If the rotation of the bed and linear acceleration irradiation device is incorrect, the radiation will be concentrated in a large oval position centered on the affected area, which may damage normal tissue around the affected area. .

In addition, after deciding where to sleep in bed, you will need to use a CT scan to determine the center position of the affected area, and then return to the bed to undergo long-term radiation therapy.
Too much effort for the patient.

The present invention is intended to solve the above-mentioned problems, and is designed for use in a linearly accelerated irradiation device that not only can improve rotation accuracy without taking up much space, but also does not cause damage to normal tissue other than the affected area. The purpose is to provide a rotating chair.

Another object of the present invention is to provide a rotary chair for a linearly accelerated irradiation device that can maintain a natural posture so as to reduce patient pain during treatment.

[Means to solve the problem]

In order to achieve the above object, the rotary chair for a linearly accelerated irradiation device according to the present invention includes a rotary drive unit that rotates the rotary chair in a horizontal plane and moves it up and down by switching a clutch, and a rotary chair that rotates in the x-axis and y-axis directions. a horizontal moving part having a flat roller capable of moving; a seat slidably attached to the seat body of the rotating chair; a vertical movement limit switch on the seat body of the rotating chair; A limit sensor section having a changeover switch that switches the rotation control circuit of a motor by rotation and elevation, a center axis indicating device for a rotating chair that is extendable and movable from side to side to indicate the center axis of the rotating chair, and an affected area. and a fixing support part that fixes the stereotaxic fixation device that determines the center position of the stereotaxic device.

Further, the rotary drive unit of the rotary chair for a linearly accelerated irradiation device according to the present invention includes a cylindrical main shaft attached to a rotor of a motor that causes the rotary chair to rotate in a horizontal plane, and an inner portion of the cylindrical main shaft. between the cylindrical main shaft and the vertically movable screw via a vertically movable screw located at the cylindrical main shaft that rotates together with the cylindrical main shaft, and a ball screw nut rotatably coupled to the vertically movable screw. It consists of a cylindrical telescopic shaft provided.

Further, the rotary drive unit of the rotary chair for a linearly accelerated irradiation device according to the present invention includes a clutch convex portion provided on the cylindrical main shaft, and a clutch convex portion that is attached and detached by vertical movement of a clutch lever. The clutch mechanism includes a clutch recess that connects and separates the rotation of the cylindrical main shaft from and into the cylindrical telescopic shaft.

In addition, the limit sensor section of the rotary chair for the linear acceleration irradiation device of the present invention shines light on the light reflecting cylinder provided at the bottom of the seat body, receives the reflected light, and detects the lower limit of the seat body. A photoelectric switch for detecting the lower limit that illuminates the upper part of the seat body and uses the reflected light to detect the upper limit of the seat body. It consists of a changeover switch that switches the rotation control circuit.

Furthermore, between the upper part of the seat main body and the lower part of the seat of the rotary chair for the linearly accelerated irradiation device according to the present invention, there is a pillow slide for sliding the seat from side to side, and a slide plate provided at the lower part of the seat. The clutch mechanism includes a notch and a stopper that can be attached to and removed from the notch by a cam of a fixed lever provided on the upper part of the seat body.

Further, the seat of the rotary chair for a linearly accelerated irradiation apparatus according to the present invention includes a claw that engages with one end of the upper movable seat fixed to the upper surface of the pillow slide, and a claw provided on the upper part of the seat main body. It is constructed so that it can be attached and detached with a single touch, and includes a claw that engages with a receiving plate that moves elastically when the attachment/detachment lever is operated.

[Effect]

In order to enable sitting treatment, the center of rotation of the linearly accelerated irradiation device and the center of rotation of the rotary chair must coincide with the center of the affected area. The present invention is a rotary chair for a linearly accelerated irradiation device for this purpose, and its operation will be explained below.

The rotary drive unit of the rotary chair uses a single motor to rotate the rotary chair in a horizontal plane and to extend and contract it vertically by switching the clutch so that radiation is irradiated to the center of the affected area.

A horizontal moving section having flat rollers provided between the rotary chair body and the rotary chair base moves the rotary chair along the x-axis and Allows movement in the y-axis direction.

The seat portion is slidable in the left and right directions relative to the seat body of the rotary chair.

In the limit sensor section, a limit switch limits the vertical movement of the seat body of the rotary chair, and a changeover switch switches the motor rotation control circuit according to the rotation and elevation of the rotary chair.

In the fixed part, the central axis indicating device of the rotary chair is fixed so as to be extendable and movable from side to side to indicate the central axis of the rotary chair, and the stereotaxic fixing device is fixed so as to determine the central position of the affected area.

In the rotary drive, a cylindrical main shaft attached to the rotor of the motor rotates the rotary chair in a horizontal plane. Further, inside the cylindrical main shaft, there is a vertically movable screw that rotates together with the cylindrical main shaft, and the ball screw nut is rotated by the vertically movable screw. The rotation of the ball screw nut is transmitted to a cylindrical telescopic shaft provided between the cylindrical main shaft and the vertically movable screw by switching the clutch.

The clutch protrusion provided on the cylindrical main shaft and the clutch recess provided on the cylindrical telescoping shaft can be attached and detached by vertical movement of a clutch lever in a clutch mechanism provided on the rotary drive unit. . And the cylindrical main
When the shaft and the cylindrical telescopic shaft are connected, the rotating chair rotates horizontally, and when separated,
The swivel chair rises.

The lower limit detection photoelectric switch in the limit sensor section illuminates a reflecting cylinder provided at the bottom of the base body, receives the reflected light, and detects the lower limit of the base body. Further, the upper limit detection photoelectric switch detects the upper limit of the seat main body by shining light on the upper part of the seat main body and using the reflected light.

Furthermore, the selector switch detects horizontal rotation and upward rotation of the rotary chair, and controls the motor to rotate at a rotation speed appropriate for the treatment in the case of horizontal rotation, and at a constant speed in the case of upward rotation. Switch the rotation control circuit.

A pillow slide provided between the upper part of the seat main body and the lower part of the seat allows the seat to slide left and right. In addition, the clutch mechanism consists of a notch in the slide plate provided at the bottom of the seat and a stopper that can be attached to and removed from the notch by a cam of a fixed lever provided at the top of the seat body. I can do it freely.

The seat portion includes a claw that engages with one end of the upper movable seat fixed to the upper surface of the pillow slide;
It can be attached and detached with a single touch between a claw that engages with a receiving plate that moves elastically by actuation of an attachment/detachment lever provided on the upper part of the base body.

〔Example〕

The rotary drive unit A of the rotary chair will be explained based on FIG. In FIG. 1, a rotating chair base 2 with a horizontal surface is placed on a floor 1. A housing 3 on the rotary chair base 2 is fixed to the rotary chair base 2 by a housing fixing device 4. The housing 3 includes a casing 5 and a bracket 6.
is installed. A cylindrical main shaft 9 is rotatably supported inside the casing 5 and the bracket 6 via a radial bearing 7 and a cross roller bearing 8. Also, inside the casing 5 is a motor 10 for rotating the cylindrical main shaft 9.
is installed. The motor 10 is, for example, a flat servo motor, and its rotational speed is controlled to be constant by a control circuit (not shown) and a rotational speed detected from an encoder 11 into which the shaft of the cylindrical main shaft 9 is inserted. be done.

Further, the rotation of the rotor 10' in the motor 10 is transmitted to the cylindrical main shaft 9.

One end of a vertically movable screw 12 is fixed to the center of the lower part of the cylindrical main shaft 9. Further, a cylindrical telescopic shaft 13 is rotatably attached to the vertically movable screw 12 via a ball screw/nut 29.

A pedestal main body mounting flange 14 is provided at the upper end of the cylindrical telescopic shaft 13, and a pedestal main body 15 is placed on the flange 14.

A clutch 16 is attached to the upper end of the cylindrical main shaft 9 so as to be slidable in the vertical direction.

When the clutch 16 is to be slid upward, the clutch lever 20 attached to the swivel chair side support 19 of the seat body 15 having the armrest 18 is pulled upward as shown in FIG. When the clutch lever 20 is pulled upward, the wire 21 connected to the clutch lever 20 pulls the clutch 16 upward against the spring 22.

This action causes the clutch recess 23 provided in the clutch 16 and the cylindrical main shaft 9 to
The engagement with the clutch convex portion 24 provided on the
The rotation of the cylindrical main shaft 9 is no longer transmitted to the cylindrical telescoping shaft 13.

Therefore, the rotation of the cylindrical main shaft 9 is transmitted to the cylindrical telescopic shaft 13 via the vertically movable screw 12 and the ball screw nut 29. At this time, the cylindrical telescopic shaft 13 rises without rotating.

Furthermore, in order to irradiate the center of the affected area with radiation, it is necessary to align the rotational axis of the rotary chair B, which is the center of the affected area, with the rotational center of the linear acceleration irradiation device (not shown). For this purpose, an x-axis flat roller 25 and a y-axis flat roller 25 as shown are provided between the swivel chair base 2 and the housing 3 so that the swivel chair B can be moved generally in the x-axis and y-axis directions.
A shaft flat roller 26 is provided. Each of the flat rollers 25 and 26 is provided, for example, two at four locations as shown, and is designed to withstand the weight of the rotary drive section A, the rotary chair B, and the patient. After the rotary chair B is moved slightly by eight flat rollers, it is fixed to the rotary chair base 2 by the housing fixing device 4. In addition, the base body mounting flange 14
A light reflecting cylinder 27 is attached to the clutch 16, and a pressing plate 28 is attached to the clutch 16, respectively.

The limit sensor section E of the seat main body 15 according to the present invention will be explained based on the plan view of FIG. 2A and the sectional view of FIG. 2B.

The limit sensor section E of the seat main body 15 is for turning off the power to the motor 10 of the rotary drive section A when the rotary chair B reaches its upper or lower limit. That is, on the bracket 6, a photoelectric switch 30 for upper limit detection, a photoelectric switch 31 for lower limit detection, and a micro switch 32 are provided. The upper limit detection photoelectric switch 30 is
Light is emitted toward a light reflecting cylinder 27 provided above, and the reflected light is received. The lower limit detection photoelectric switch 31 emits light in the lateral direction of the light reflecting cylinder 27 and receives reflected light from the lateral direction. The micro switch 32 is turned on and off by a pressure plate 28 provided to detect whether the clutch lever is pulled upward.

Each of these switches 30, 31 and 32 is
The mounting plate 33 is configured to operate when necessary.
Adjustably mounted by 34 and 35. Therefore, when the rotary chair B starts to rise, the light emitted from the upper limit detection photoelectric switch 30 hits the light reflecting cylinder 27 and is reflected, but the reflection angles do not match, so the upper limit detection photoelectric switch 30 does not receive the light. Can not. However, when the rotating chair B reaches the upper limit, the light emitted from the upper limit detection photoelectric switch 30 hits the light reflecting cylinder 27 and is reflected, and is adjusted to a reflection angle that allows the upper limit detection photoelectric switch 30 to receive the light. There is.

When the rotary chair B descends and does not reach the lower limit, the light emitted from the lower limit detection photoelectric switch 31 is
The light does not hit the light reflecting cylinder 27 and does not enter the lower limit detection photoelectric switch 31. However, rotating chair B
reaches the lower limit, the lower limit detection photoelectric switch 3
The light emitted from the light reflecting cylinder 27 is reflected and adjusted to a reflection angle such that the light can be received by the photoelectric switch 31 for lower limit detection.

Further, as shown in FIG. 1, when the clutch lever 20 is lowered, the micro switch 32 is pressed by the pressing plate 28.
That is, when the cylindrical main shaft 9 and the cylindrical telescopic shaft 13 shown in FIG. 1 are rotating together, the circuit of the micro switch 32 is changed to a speed suitable for irradiating the affected area with radiation. It's becoming like that. On the other hand, when the clutch lever 20 is raised upwardly, the micro switch 32 is not pressed by the pressing plate 28.

That is, the cylindrical main shaft 9 and the cylindrical telescopic shaft 13 shown in FIG.
The cylindrical telescopic shaft 13 rises. Since there is no need to change the rising speed of the cylindrical telescopic shaft 13, the circuit of the micro switch 32 is switched so that the speed is always constant.

The seat portion lateral movement device according to the present invention will be explained based on the plan view of FIG. 3A and the side view of FIG. 3B.

In FIG. 3, a pillow slide 39 is interposed between a lower movable seat 37 fixed on the base body 15 and an upper movable seat 38 to which the seat D is attached. The pillow slide 39 allows the seat portion D to slide in the left-right direction.

Further, a slide plate 41 is attached to the upper movable seat 38 via a spacer 40. A notch 42 is provided in the slide plate 41, and a cam 45 is operated by a fixed lever 43 and a lever 44 to fit a stopper 46 into the notch 42.

This allows the seat D to be locked.

Note that a stopper 47' for the slide plate 41 is provided to prevent the slide plate 41 from coming off.

A claw 47 for attaching the seat D to the upper movable seat 38 is provided at one end of the seat D. A claw 48 provided at the other end of the seat D engages with an engaging portion of a receiving plate 50 that is moved by a spring 49. In the receiving plate 50, the cam 52 is interlocked with the rotation of the attachment/detachment lever 51, and the upper movable seat 38 is pulled to the right as shown in FIG. Therefore, the seat D engages one end of the upper movable seat 38 with the claw 47, is engaged with the receiving plate 50 with the claw 48 at the other end, and is pulled toward the right in the figure by the detachable lever 51 and the cam 52 and locked. be done.

Regarding the fixed support part F for fixing the rotary chair central axis indicating device G and the stereotaxic fixing device in the present invention based on the plan view in FIG. 4A, the side view in FIG. 4B, and the partial sectional view in FIG. 4C explain.

In FIG. 4, the rotary chair back support 55 is connected to the seat main body 15 shown in FIG. The rotary chair back column 55 is provided with column insertion holes 56 and 57 for a stereotaxic fixing device (not shown) on the left and right sides, and a first arm insertion hole 58 in the center.

Further, the fixed support portion F is provided with locking screws 59 that lock the columns of the stereotactic fixing device and the column of the first arm 61 (not shown) when they are inserted into the holes 56 to 58, respectively.

The rotary chair center axis indicating device G includes the first arm 61
It is composed of a second arm 62 and a rotation axis indicating plate 65, and is extendable and retractable in the length direction by each arm.

This adjustment is performed using a feed screw 63, and after adjustment, it is locked using a lock nut 64.

To adjust the angle between the rotation axis of the rotary chair B and the rotation axis indicator plate 65, the rotation axis indicator plate 65 is adjusted within the range of the elongated hole 67, and fixed with the angle adjustment knob 66. Furthermore, the rotation axis center of the rotation chair B and the rotation axis indication plate 65
In order to match the center position 68 of , adjustment is performed using four adjustment knobs 69 as shown in FIG.

The manner of use of the rotary chair for a linearly accelerated irradiation apparatus having the above configuration will be explained.

First, the patient is seated on rotating chair B, with the center of the affected area approximately at the center of rotation of rotating chair B.
For example, a head stereotaxic device (not shown) is attached to the head. Then, the support of the head stereotaxic device is inserted into the fixed support portion F provided on the rotating chair back support 55. The stereotaxic fixation device is a well-known device that can express the center position of the affected area as an x-axis, y-axis, and z-axis coordinate point on the stereotaxic fixation device.

Next, the patient goes to the CT scan room while wearing a head restraint and undergoes a CT scan. This determines the relative position between the center position of the affected area and the coordinate points on the head fixation device.

Align the tip of the indicator pin of the simulation device, which is the same as the head fixation device worn by the patient, with the coordinate point determined by the CT scan. This simulation device is installed on the fixed support part F of the rotary chair B, and adjusted so that the center of rotation of the linearly accelerated irradiation device and the center of rotation of the rotary chair match the tip of the pointing pin of the simulation device. That is, this point coincides with the center of the affected area.

Next, the adjustment of the rotary chair for the linearly accelerated irradiation device will be explained below.

The clutch 16 is pulled up as shown in FIG. 1 so that the radiation is applied to the center of the affected area. That is, the clutch concave portion 23 of the clutch 16 and the clutch convex portion 24 of the cylindrical main shaft 9 are disengaged, the cylindrical telescopic shaft 13 is raised by the rotation of the motor 10, and radiation is irradiated to the center of the affected area. Stop when reaching height.

Housing 3 of rotation drive unit A and rotating chair base 2
Rotary chair B is horizontally moved by x-axis and y-axis flat rollers 25 and 26 provided between the rotary chair B and the center of rotation of the rotary chair and the center of rotation of the linearly accelerated irradiation device.

Slide the seat D in the left-right direction with respect to the seat main body 15 of the rotary chair B using the pillow slide 39 interposed between the seat D and the seat main body 15,
After making adjustments so that the patient can receive treatment in a comfortable position, the seat D is locked in that position.

The fixed support part F is adjusted so that the center position 68 of the central axis indicating device G of the rotating chair B indicates the central axis of the rotating chair B.

In this way, each of the above devices is adjusted little by little through trial and error until the indicated position of the pointing pin of the simulation device (not shown) matches the rotation center of rotary chair B and the rotation center of the linearly accelerated irradiation device. conduct.

After completing this adjustment, the simulation device is removed, and the head stereotaxic device attached to the patient's head is fixed in the same place along with the patient. That is, the center of the patient's affected area coincides with the rotation center of the rotary chair B and the rotation center of the linearly accelerated irradiation device.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. Various design changes can be made without departing from the scope of the invention as set forth in the claims.

For example, rotating chair B includes a housing 3 and a bracket 6, a cylindrical main shaft 9, a vertically movable screw 12, and a cylindrical telescoping shaft 1.
In addition to the radial bearing 7 and cross roller bearing 8 as shown in FIG. 1, a vibration-proof rubber ring or the like is provided between the rotary shaft 3 and the rotary shaft 3 in order to prevent the rotary shaft from wobbling around the rotating shaft.

〔Effect of the invention〕

According to the present invention, the rotary chair can be easily adjusted for movement in the x-, y-, and z-axis directions, and the seat on which the patient sits can be easily slid from side to side. The rotation center of the rotary chair can be aligned with the rotation center of the linearly accelerated irradiation device.

In addition, the cylindrical main shaft and the vertically movable screw are double axes, and the intermediate shaft extends and contracts up and down, so not only is there no wobbling of the rotation axis, but a single motor can rotate the swivel chair both horizontally and vertically. Movement is easy with the clutch.

Furthermore, since the chair is rotating, the detection of the upper and lower limits of the rotary chair is performed using light and mechanical movement instead of mechanical detection, and therefore is highly safe.

In addition, the space left after subtracting the height of the ceiling of the hospital room, the height of the linear acceleration irradiation device, and the height of the motor, which has enough torque to evenly rotate the patient and the rotating chair, is limited, so the seating area must be You can also replace it with a thinner one with just one touch.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the rotary drive part of the rotary chair according to the present invention, Fig. 2 A and B are explanatory diagrams of the limit sensor section of the seat main body according to the present invention, and Fig. 3 A and B are explanatory diagrams of the seat body horizontal movement according to the present invention. FIGS. 4A to 4C are explanatory views of the fixed support portion of the rotary chair central axis indicating device and the stereotaxic fixing device according to the present invention. A...Rotary drive unit, B...Rotary chair, C...Horizontal plane moving unit, D...Seat section, E...Limit sensor section, F...Fixed support section, G...Rotary chair center axis indicating device , 1...floor, 2...swivel chair base, 3...
...Housing, 4...Housing fixing device, 5...
...Casing, 6...Bracket, 7...Radial bearing, 8...Cross roller bearing, 9...Cylindrical main shaft, 10...
Motor, 11... Encoder, 12... Vertical screw, 13... Cylindrical telescopic shaft, 14...
...Seat body mounting flange, 15...Seat body, 1
6...Clutch, 20...Clutch lever, 2
3...Clutch concave portion, 24...Clutch convex portion, 2
5...x-axis flat roller, 26...y-axis flat roller, 27...light reflecting cylinder, 28...
...Press plate, 30...Photoelectric switch for upper limit detection, 3
1... Photoelectric switch for lower limit detection, 32... Micro switch, 37... Lower moving seat, 38... Upper moving seat, 39... Pillow slide, 41... Slide plate, 42... Notch, 43... fixed lever,
45...Cam, 47...Claw, 48...Claw, 49...
... Spring, 50 ... Reception plate, 51 ... Attachment/detachment lever,
52...Cam, 55...Rotary chair back support, 56
... Stereotaxic fixation device support column insertion hole, 58 ... First arm insertion hole, 59 ... Lock screw, 61 ... First arm, 62 ... Second arm, 65 ... Rotation axis indication plate, 68 ... Center position .

Claims (1)

[Scope of Claims] 1. In a rotary chair for a linearly accelerated irradiation device for performing treatment in which the center of rotation of the linearly accelerated irradiation device and the rotary chair coincides with the center of the affected area to irradiate radiation to the affected area, the rotary chair for the linearly accelerated irradiation device includes: Rotation drive unit A that performs rotation on a horizontal plane and vertical movement by switching the clutch 16
, a horizontal plane moving part C having flat rollers 25 and 26 that can move the rotary chair B in the x- and y-axis directions, and a seat slidably attached to the seat body 15 of the rotary chair B. D, the vertical movement limit switches 30 and 31 on the seat body 15 of the rotating chair B, and the rotation of the rotating chair B.
a limit sensor section E having a changeover switch 32 that switches the rotation control circuit of the motor when the motor rises;
and a central axis indicating device G of the rotary chair B that is extendable and movable from side to side to indicate the central axis of the rotary chair B, and a fixed support portion F that fixes a stereotaxic fixing device that determines the center position of the affected area. A rotary chair for a linear acceleration irradiation device, characterized by comprising: 2. The rotation drive section A includes a cylindrical main shaft 9 attached to the rotor 10' of a motor 10 that horizontally rotates the rotary chair B, and a cylindrical main shaft 9 located inside the cylindrical main shaft 9. The cylindrical main shaft 9 and the vertically movable screw 12 are connected to each other via a vertically movable screw 12 that rotates together with the shaft 9 and a ball screw nut 29 that is rotatably coupled to the vertically movable screw 12.
The rotary chair for a linearly accelerated irradiation device according to claim 1, further comprising: a cylindrical telescopic shaft 13 provided between the rotary chair and the rotary chair. 3. The rotary drive unit A is attached to and detached from the clutch protrusion 24 by the vertical movement of the clutch lever 20 and the clutch protrusion 24 provided on the cylindrical main shaft 9. The rotary chair for a linearly accelerated irradiation apparatus according to claim 2, further comprising: a clutch mechanism (16) comprising a clutch recess (23) for rotating the cylindrical telescopic shaft (13) toward and away from the shaft. 4 The limit sensor section E is connected to the seat main body 15.
Shining light onto a light reflecting cylinder 27 provided at the bottom of the
A lower limit detection photoelectric switch 31 detects the lower limit of the seat main body 15 by receiving the reflected light, and an upper limit detection device illuminates the upper part of the seat main body 15 and detects the upper limit of the seat main body 15 using the reflected light. 2. The linear acceleration irradiation device according to claim 1, further comprising: a photoelectric switch 30 for use in the rotating chair B; and a changeover switch 32 for switching the rotation control circuit of the motor 10 depending on horizontal rotation and upward rotation of the rotary chair B. swivel chair. 5. Between the upper part of the seat main body 15 and the lower part of the seat D, there is a pillow slide 39 for sliding the seat D left and right, and a notch 42 in the slide plate 41 provided at the lower part of the seat D. A fixed lever 4 provided at the top of the base body 15
2. The rotary chair for a linearly accelerated irradiation apparatus according to claim 1, further comprising a clutch mechanism comprising a stopper 46 that can be attached to and detached from the notch 42 by a cam 45 of 3. 6 The seat portion D includes a claw 47 that engages with one end of the upper movable seat 38 fixed to the upper surface of the pillow slide 39, and an actuation of the attachment/detachment lever 51 provided on the upper portion of the seat main body 15. 2. The rotary chair for a linearly accelerated irradiation apparatus according to claim 1, characterized in that the rotating chair comprises: a claw 48 that engages with the receiving plate 50 that moves elastically, and can be attached and detached with a single touch.