JPH0455715B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a rotating chair for a linearly accelerated irradiation device that allows radiation therapy to be performed while the patient is in a comfortable sitting position. This invention relates to a dedicated mobile trolley for a rotary chair for a linearly accelerated irradiation device that can be removed from the vehicle.

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.

Therefore, instead of rotating the bed on which the patient is lying, sitting medical treatment is being considered, in which the chair on which the patient is sitting is rotated.

[Problem to be solved by the invention]

However, when performing sitting irradiation treatment using an existing linearly accelerated irradiator, a rotating chair must be installed under the linearly accelerated irradiator instead of a bed. If the rotary chair is repeatedly moved, there is a risk that the rotation of the rotary chair for the linearly accelerated irradiation device will be slightly distorted. If the rotary chair rotates incorrectly, normal tissue around the affected area may be damaged as described above, so the rotary chair cannot be transported with casters attached. Precision machinery is usually fixed precisely to the floor, and there was no thought of transporting it from time to time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a dedicated moving cart for a rotary chair for a linearly accelerated irradiation device, which does not impair accuracy even when the rotary chair for a linearly accelerated irradiator is transported at any time.

In addition, the present invention provides a dedicated moving trolley for the rotary chair for the linearly accelerated irradiation device that can be easily handled by nurses engaged in medical care and that does not impair accuracy when transporting the rotary chair for the linearly accelerated irradiator. The purpose is to provide.

[Means for Solving the Problems] In order to achieve the above object, the dedicated moving trolley for a rotary chair for a linear acceleration irradiation device comprising a horizontal support, an auxiliary support for gearbox mounting, and a hand fork according to the present invention has a horizontal support, A suspension support rod is provided at the bottom of the rotary chair for linear acceleration irradiation equipment and is removable from the suspension support hole provided in the base of the rotary chair for linearly accelerated irradiation equipment. A worm gear box placed on an auxiliary support column, a bevel gear box placed on a central auxiliary flat plate for rotating the worm gears in the left and right worm gear boxes at the same direction and at the same speed, and the two worms. A worm gear box mounted on a central auxiliary flat plate having a worm gear for rotating in the same direction and at the same speed as the gear and for suspending the central suspension support rod, and the worm gears of all the worm gear boxes described above are the same. It consists of a bevel gear box linked to the drive shaft to rotate in the same direction and at the same speed.

In addition, the arrangement of the suspension support rods provided on the dedicated movable trolley of the rotary chair for the linearly accelerated irradiation device of the present invention is as follows:
After the left and right suspension support rods are inserted into the suspension support hole, the center suspension support rod is inserted into the center suspension support hole.

[Effect]

A dedicated mobile cart for a rotary chair for a linearly accelerated irradiation device is composed of a horizontal support, an auxiliary support on which a gearbox is placed, and a hand-push fork with a drive unit.

A suspension support rod is provided at the lower part of the horizontal column and is detachable from a suspension support hole provided in the base of the rotary chair for the linearly accelerated irradiation device.

After inserting the suspension support rod of the dedicated movable trolley of the rotary chair for the linearly accelerated irradiation device into the suspension support hole, the drive section of the dedicated movable trolley is rotated. This rotation is transmitted to the bevel gear of the bevel gearbox via the drive shaft. The output of the bevel gear is transmitted by the primary shaft to the worm gear of the first worm gear box. Furthermore, the rotation of the primary axis is
The signal is transmitted to the bevel gears of the bevel gear boxes provided on the left and right sides. The rotational output of the bevel gear is transmitted to the worm gears of the second and third worm gear boxes via the secondary shaft.

Therefore, when the dedicated truck starts to be driven, the first and third worm gears start rotating in the same direction and at the same speed. The three suspension support rods connected to the worm gear can be raised simultaneously to lift the rotary chair for the linear acceleration irradiation device in a completely horizontal state and move the rotary chair to a desired location.

〔Example〕

FIG. 1 is an explanatory diagram of a rotation drive unit of a rotary chair for a linearly accelerated irradiation device.

In FIG. 1, a rotating chair base 2 with a horizontal surface is placed on a floor 1. Rotating chair base 2
The upper housing 3 is fixed to the rotating chair base 2 by a housing fixing device 3'. A cylindrical main shaft 4 is rotatably supported in the housing 3. Furthermore, a motor 5 for rotating the cylindrical main shaft 4 is attached inside the housing 3. motor 5
is, for example, a flat servo motor,
The rotational speed of the cylindrical main shaft 4 is controlled to be constant by the rotational speed detected from the encoder 6 into which the shaft is inserted and by a control circuit (not shown).

Further, the rotation of the rotor 7 in the motor 5 is transmitted to the cylindrical main shaft 4.

One end of a vertically movable screw 8 is fixed to the center of the lower part of the cylindrical main shaft 4. Further, a cylindrical telescopic shaft 10 is rotatably attached to the vertically movable screw 8 via a ball screw/nut 9.

A pedestal main body mounting flange 11 is provided at the upper end of the cylindrical telescopic shaft 10, and a pedestal main body 12 is placed on it. A seat part 13 is attached on the base body 12 so as to be slidable in the left and right direction and to be replaceable.

A clutch 14 is attached to the upper end of the cylindrical main shaft 4 so as to be slidable in the vertical direction.

When the clutch 14 is to be slid upward, a clutch lever 17 attached to a side post 16 of the seat main body 12 having an armrest 15 is pulled upward as shown in FIG. When the clutch lever 17 is pulled upward, the wire connected to the clutch lever 17 pulls the clutch 14 upward against the spring force.

As a result of this action, the clutch concave portion provided on the clutch 14 disengages from the clutch convex portion provided on the cylindrical main shaft 4, and the rotation of the cylindrical main shaft 4 is caused by the rotation of the cylindrical telescopic shaft 10. It will no longer be transmitted.

Therefore, the rotation of the cylindrical main shaft 4 is transmitted to the cylindrical telescopic shaft 10 via the vertically movable screw 8 and the ball screw nut 9. This cylindrical telescopic shaft 10 rises without rotating.

When the clutch lever 17 is pulled down, the cylindrical main shaft 4 and the cylindrical telescopic shaft 10 are moved by the engagement between the clutch concave portion and the clutch convex portion.
The rotation of the motor 5 causes the rotary chair to rotate horizontally.

Then, in order to irradiate radiation to the center of the affected area,
The patient's affected area is aligned with the rotation axis of the rotary chair, and the rotation axis of the rotary chair is aligned with the rotation center of the linear acceleration irradiation device (not shown).

The patient sits on a rotating chair and is rotated, for example, 1/2 revolution per second, in a horizontal plane around the center of the affected area.

A linear acceleration irradiation device (not shown) irradiates radiation to the center of the affected area for 30 to 40 minutes while rotating, for example, about 90 degrees within a vertical plane from the center of the affected area.

Using ordinary methods such as attaching casters to such a precision rotary chair, it is not possible to maintain the precision of the rotary chair if the rotary chair is constantly transported.

A dedicated movable cart for a rotary chair for a linearly accelerated irradiation device will be described below with reference to FIG. 2A, a top view and a B side view, and FIG. 3A, a front view and a B side view.

In the figure, a U-shaped horizontal support 21 is provided with an auxiliary support 24 on which second and third worm gear boxes 22, 22' are placed, as shown in FIG. Additionally, bevel gear boxes 25 to 27 are also provided on the horizontal support 21.
A central auxiliary flat plate 28 on which the first worm gear box 23 is placed is also provided. A hand fork 29 is provided substantially vertically on the horizontal support 21. A horizontal support 21 is connected to the lower end of the hand fork 29, and a bearing 31 of a drive shaft 30 is connected to the upper end.
A flange 23 is provided on which the flange 23 is placed.

Further, the rotation of the drive shaft 30 is controlled by the bevel gearbox 27 via the universal joint 33.
is transmitted to the bevel gear. The rotation of the bevel gear of the bevel gear box 27 is transmitted by the primary shaft 34 to the worm gear of the first worm gear box 23 and the bevel gears of the bevel gear boxes 25 and 26.

Further, the rotation of the bevel gears of the bevel gear boxes 25, 26 is transmitted to the second and third worm gear boxes 22, 2 through the secondary shafts 35, 36.
2' is transmitted to the worm gear.

The drive shaft 30 is rotated by a handle 37.

The second and third worm gear boxes 22, 22' and the first worm gear box 23 mounted on the auxiliary support 24 have the structure shown in the front view in FIG. 3A and the side view in FIG. 3B. ing.
That is, the worm 43 of each worm gear box is connected to the primary or secondary shafts 34-36. Further, the primary shaft 34 connected to the worm 43 is supported by a bearing 42 of the base block 41. The rotation of the primary shaft 34 is caused by a rotation from a worm 43 to a worm wheel 44.
is transmitted to. It is then further transmitted to the inner thread of the worm wheel. At the lower part of the threaded rod 45 which is screwed into the inner thread of the worm wheel,
A suspension support section 47 is slidably suspended, and a suspension support rod 48 extending in the horizontal direction is provided at the lower part of the suspension support section 47 . The suspension support rod 48 has a tapered end. Note that the suspension support portion 47 is slidably moved up and down within the suspension holder 46.

Next, a case will be described in which the rotary chair is suspended and moved using a dedicated movable cart for the rotary chair for the linearly accelerated irradiation apparatus of the present invention.

Bring the dedicated moving trolley for the rotary chair for the linear acceleration irradiation device closer to the rotary chair. The suspension support rod 48 of the mobile cart is inserted toward the suspension support hole 20 of the rotary chair. At this time, even if the centers of the suspension support rod 48 and the suspension support hole 20 are slightly shifted, the suspension support rod 48
The tip is tapered so it can be easily joined. In addition, the first worm gear box 2
The central suspension support rod 49 suspended from the suspension support rod 3 is placed at a position where the suspension support rod 48 and the suspension support hole 20 are connected later than the connection between the suspension support rod 48 and the suspension support hole 20. By doing this, the two suspension support rods 48 are connected to the suspension support hole 20.
, the central suspension support rod 49 is automatically inserted into the suspension support hole 20.

In this state, for example, the handle 37 is rotated to rotate the drive shaft 30 of the dedicated mobile cart. This rotation is transmitted to the bevel gear of the bevel gear box 27 via the drive shaft 30. The bevel gear output of the bevel gear box 27 is
4 to the worm gear of the first worm gear box 23. Further, the rotation of the primary shaft 34 is transmitted to bevel gear boxes 25 and 26 provided on the left and right sides. The rotational output of each bevel gear box 25, 26 is
5, 36 to the worm gears of the second and third worm gear boxes 22, 22'.

Therefore, when the handle 37 of the special cart is driven, the worm gears of the first to third worm gear boxes start rotating in the same direction and at the same speed. The three suspension support rods 48 and 49 connected to each worm gear simultaneously rise to lift the rotary chair for the linearly accelerated irradiation device on a completely horizontal plane, and move the rotary chair to a desired location on casters 50. be able to.

When the rotating chair is to be lowered from the dedicated cart, the handle 37 may be rotated in the opposite direction. Since the worm gear is inserted in three places, there is no need to insert a reverse rotation prevention device other than the gear.

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, in the dedicated moving trolley for the rotary chair for the linearly accelerated irradiation device in the embodiment, the suspension support rod is raised and lowered by manually rotating the handle, but it may also be driven by a motor or hydraulic pressure. If a motor or hydraulic pressure is used, these operations are performed using a foot switch or the like.

Further, in this embodiment, a case has been described in which the number of suspension support rods and suspension support holes is three, but it is also possible to have three or more suspension support rods and suspension support holes.

Further, in the embodiment, the dedicated moving cart for the rotary chair for the linearly accelerated irradiation device is formed of a U-shaped horizontal support, but it goes without saying that the shape may be rectangular or other modified examples.

〔Effect of the invention〕

According to the present invention, the suspension support rods suspended from the horizontal supports of the dedicated mobile cart for the rotary chair for linearly accelerated irradiation equipment can be raised and lowered at the same speed, so the rotary chair can be transported at any time without damaging the rotating shaft, etc. can.

Further, according to the present invention, since the worm gear is inserted in at least three places, the rotary chair will not fall during movement.

Furthermore, according to the present invention, after inserting the two suspension support rods into the suspension support holes of the rotary chair, the central suspension support rod is inserted into the suspension support hole of the rotary chair.
It is easy to align the suspension support rod and the suspension support hole.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the rotary drive unit of the rotary chair for the linear acceleration irradiation device, Figure 2 A and B are explanatory diagrams of the dedicated movable trolley for the rotary chair for the linear acceleration irradiation device, and Figure 3 A and B are explanatory diagrams of the worm gear box. It is a diagram. 1...floor, 2...swivel chair base, 3...housing,
4... Cylindrical main shaft, 5... Motor, 8...
Vertical movement screw, 9...Ball screw nut, 1
0...Cylindrical telescopic shaft, 12...Seat main body, 13
...Seat portion, 14...Clutch, 17...Clutch lever, 20...Suspension support hole, 21...Horizontal support, 22~
23... Worm gear box, 24... Auxiliary support column, 25-27... Bevel gear box, 30...
Drive shaft, 34...Primary shaft, 35...Secondary shaft, 43...Worm, 44...Worm wheel, 48...Suspension support rod.

Claims (1)

[Scope of Claims] 1. In a dedicated mobile trolley for a rotary chair for a linearly accelerated irradiation device, which is comprised of a horizontal support, an auxiliary support for placing a gearbox, and a hand fork, the rotating chair for the linearly accelerated irradiation device is provided at the bottom of the horizontal support 21, Suspension support hole 2 provided in the base of the chair
0, a suspension support rod 48 that can be attached and detached from the center suspension support rod 49, worm gear boxes 22, 22' placed on the left and right auxiliary columns 24 for suspending and moving the suspension support rod 48, and the left and right worm gear boxes 22, 22'. Worm gear box 22,2
bevel gear boxes 25 and 26 placed on the central auxiliary flat plate 28 to rotate the worm gears 2' in the same direction and at the same speed; a worm gear box 23 mounted on the central auxiliary flat plate 28 having a worm gear for suspending the central suspension support rod 49; and all the worm gear boxes 22, 2.
A bevel gear box 27 interlocked with a drive shaft 30 in order to rotate the worm gears 2' and 23 in the same direction and at the same speed. 2. The linearly accelerated irradiation apparatus according to claim 1, wherein the central suspension support rod 49 is inserted into another suspension support hole 20 after the suspension support rod 48 is inserted into the suspension support hole 20. Dedicated moving trolley for swivel chairs.