JP6842966B2 - Particle beam therapy device - Google Patents

Description

The present invention relates to a particle beam therapy apparatus, and more particularly to a seismic retrofitting structure of a rotating gantry.

The particle beam therapy device is a device that treats cancer by irradiating the affected area with an ion beam such as protons or carbon ions, and is a rotating gantry that is a rotating irradiation device for irradiating the affected area with an ion beam from an appropriate direction. I have. This rotating gantry is equipped with an irradiation device for irradiating the affected area with an ion beam and a beam path for transporting the particle beam accelerated by the accelerator to the irradiation device.

For example, as shown in Patent Documents 1 and 2 below, the rotating gantry includes a rotating gantry body (gantry frame), an incident side bearing ring (rear ring) and an irradiation side bearing ring (front) attached to the outer periphery thereof. Ring). Rollers (support rolls) are provided under each of the incident side bearing ring and the irradiation side bearing ring, and each roller supports the weight of the rotary gantry and is connected to the gantry drive motor to drive the rotary gantry to rotate. Is responsible for.

Further, the particle beam therapy device of Patent Document 2 aims to reliably stop the rotating gantry, which is a huge rotating body, in the event of an earthquake, and prevents the rotating gantry from tipping over in the event of an earthquake. Is not intended.

On the other hand, from the viewpoint of patient convenience, there is an increasing demand for installation of particle beam therapy equipment in urban areas in recent years. In this case, it is difficult to secure a vast land in urban areas, so there is a demand for the development of a particle beam therapy device that can be constructed even in a narrow land. As a countermeasure, for example, an accelerator is installed on the basement floor of the building, and a rotating gantry is installed on the middle floor of the building.

Here, when a rotating gantry is installed on an intermediate floor such as the second floor, the shaking caused by the earthquake is amplified. In that case, in seismic class B defined in Non-Patent Document 1, it is required that the rotating gantry does not tip over due to the following shaking.
・ 1st floor installation standard: horizontal acceleration 0.4G, vertical acceleration 0.2G
・ Intermediate floor installation standard: Horizontal acceleration 0.6G, Vertical acceleration 0.3G

As described above, the acceleration of the shaking of the intermediate floor installation standard is higher than that of the first floor installation standard. Therefore, the rotating gantry installed on the intermediate floor requires a high seismic design.

Japanese Patent No. 3519248 Japanese Patent No. 5511904

Building equipment seismic design and construction guidelines

As described above, since it is necessary to irradiate the affected area with an ion beam from an appropriate direction, the rotating gantry of the particle beam therapy device is mounted on a roller which is a support device and is configured to be rotatable. Therefore, the rotating gantry cannot be integrally fixed to the building. Therefore, in the event of a large earthquake, there is a possibility that the rotating gantry will fall off the roller and fall.

In the conventional configuration described in Patent Document 1 above, no measures have been taken in the event of an earthquake. Therefore, when a rotating gantry is installed on the middle floor of the building, the rotating gantry derails from the rollers as described above. There is a possibility of falling.

Further, in the conventional configuration described in Patent Document 2 above, although the operation of the rotating gantry can be stopped when an earthquake occurs, the rotating gantry is not physically restrained in response to the occurrence of an earthquake. Similar to Patent Document 1, it is difficult to prevent the rotating gantry from falling off the roller and tipping over.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a particle beam therapy device capable of reliably preventing a rotating gantry from tipping over in the event of an earthquake.

The particle beam therapy device according to the present invention includes a rotatable rotary gantry equipped with an irradiation device that irradiates a patient with particle beams accelerated by an accelerator, and the rotary gantry is provided at both ends of a cylindrical body portion in the direction of the rotation axis. An annular bearing ring is provided in each of the above bearing rings, and a support device having at least two rollers for rotationally supporting the bearing ring is arranged below each of the bearing rings and fixed to the building. At least one of the bearing rings is provided with a seismic support fixed to the building so as to surround at least the upper half of the outer circumference of the bearing ring.

According to the particle beam therapy device of the present invention, since the seismic support suppresses excessive vibration of the rotating gantry when an earthquake occurs, it is possible to surely prevent the occurrence of a problem such as the rotating gantry falling.

It is a perspective view which shows the main part including the rotation gantry of the particle beam therapy apparatus according to Embodiment 1 of this invention. It is a front view which looked at the rotary gantry of Embodiment 1 of this invention from the incident side of the particle beam. It is a front view which looked at the rotary gantry of Embodiment 1 of this invention from the irradiation side of the particle beam. It is a perspective view which shows the main part including the rotation gantry of the particle beam therapy apparatus by Embodiment 2 of this invention. It is a front view which looked at the rotary gantry of Embodiment 2 of this invention from the incident side of the particle beam. It is a front view which looked at the rotary gantry of Embodiment 2 of this invention from the irradiation side of the particle beam. It is a detailed view which shows the state which attached the shock absorber attached to the seismic support in Embodiment 2 of this invention. It is a perspective view which shows the main part including the rotation gantry of the particle beam therapy apparatus according to Embodiment 3 of this invention.

Embodiment 1.
FIG. 1 is a perspective view showing a main part including a rotating gantry of the particle beam therapy apparatus according to the first embodiment of the present invention, and FIG. 2 is a front view and a view of the rotating gantry of the first embodiment as viewed from the incident side of the particle beam. 3 is a front view of the rotary gantry of the first embodiment as viewed from the irradiation side of the particle beam.

The particle beam therapy apparatus according to the first embodiment includes a rotating gantry 1. The rotary gantry 1 includes a cylindrical body portion 11, annular bearing rings 12 and 13 provided at both ends of the body portion 11 in the rotation axis direction, and a cylindrical cable spool located on one bearing ring 12 side. It is composed of a hollow cone-shaped spool cone 15 for connecting and fixing the body portion 11 and the cable spool 14.

Here, the cable spool 14 side on which the particle beam accelerated by the accelerator is incident is referred to as an incident side, and the installation side of the treatment table 4 for irradiating the patient with the particle beam is referred to as an irradiation side.

The treatment table 4 is fixed to the floor surface F2 of the building protruding inside the body portion 11 of the rotating gantry 1, and the body portion 11 can rotate around the treatment table 4. The rotating gantry 1 is equipped with a transport device (electromagnet) for transporting particle beams, an irradiation device for irradiating the affected area with particle beams (all not shown), and is suitable for the affected area of the patient placed on the treatment table 4. Irradiate particle beams from various angles to treat cancer.

Further, on the outside of the cable spool 14, cables for supplying and controlling power to the devices mounted on the rotary gantry 1 and hoses for supplying cooling water, air, gas, etc. (all not shown). Is provided and connected to the ground side, and the cables and hoses are wound and sent out on the outer circumference of the cable spool 14 according to the rotation of the body portion 11. With this cable spool 14, even if the rotating gantry 1 rotates, the devices mounted in the rotating gantry 1 can be connected to the ground side, and the devices can be operated normally.

Bearing rings 12 and 13 provided at the axially incident side and irradiation side ends of the body portion 11 are integrally connected to the outer periphery of the body portion 11, and these bearing rings 12 and 13 are, for example, forged. A high-strength material such as heat-treated chrome molybdenum steel is preferably used.

Support devices 2 and 3 are installed on the floor surface F1 of the building below the bearing rings 12 and 13 on the incident side and the irradiation side, respectively, to support the weight of the rotating gantry 1. In this case, since the support devices 2 and 3 are installed on the floor surface F1 below the rotating gantry 1, the floor surface F1 is located at a position lower than the floor surface F2 on which the treatment table 4 is installed by a step L0. It is in.

Here, the support device 2 on the incident side is composed of a base 21 fixed to the floor surface F1 of the building and two or more rollers 22 fixed to the base 21, and a bearing ring is placed on the rollers 22. 12 is installed. Similarly, the support device 3 on the irradiation side is composed of a base 31 fixed to the floor surface F1 of the building and two or more rollers 32 fixed to the base 31, and a bearing ring is placed on the rollers 32. 13 is installed.

A power source such as a motor and a brake (both not shown) are connected to at least one of the rollers 22 and 32 on the incident side and the irradiation side, and the rotary gantry 1 can be driven and stopped. ..

Further, a thrust bearing (not shown) is provided on the bearing ring 12 (or 13) on the motor installation side, and the rotary gantry 1 itself is positioned in the axial direction as the rotary gantry 1 rotates due to the thrust bearing. It prevents it from shifting.

Further, as a feature of the first embodiment, a gate-shaped seismic support 6 is installed so as to surround the outer periphery of the bearing ring 12 on the incident side with respect to the bearing ring 12 on the incident side. The seismic support 6 includes a pair of linear vertical columns 61 erected vertically from the left and right on the radial outer side of the bearing ring 12 with respect to the floor surface F1 of the building, and above the outer periphery of the bearing ring 12. It is composed of a beam 62 that connects the upper portions of the pair of vertical columns 61 through the beam 62. The lower end of each vertical column 61 is integrated with the base plate 64 fixed to the floor surface F1 of the building by bolting or the like. Further, both ends of the beam 62 are integrally fixed to the upper ends of the left and right vertical columns 61 by welding or the like. For the vertical columns 61 and beams 62, for example, H-shaped steel is preferably used.

Similarly, a gate-shaped seismic support 7 is installed so as to surround the outer periphery of the bearing ring 13 on the irradiation side. The seismic support 7 includes a pair of linear vertical columns 71 erected vertically from the left and right on the radial outside of the bearing ring 13 with respect to the floor surface F2 of the building, and above the outer periphery of the bearing ring 13. It is composed of a beam 72 that connects the upper portions of the pair of vertical columns 71 through the beam 72. The lower end of each vertical column 71 is integrated with the base plate 74 fixed to the floor surface F2 of the building by bolting or the like. Further, both ends of the beam 72 are integrally fixed to the upper ends of the left and right vertical columns 71 by welding or the like. For the vertical columns 71 and beams 72, for example, H-shaped steel is preferably used.

When seismic supports 6 and 7 are provided on the incident side and the irradiation side, respectively, there is a step L0 between the floor surface F1 on which the support devices 2 and 3 are installed and the floor surface F2 on which the treatment table 4 is installed. The length of the vertical column 71 of the seismic support 7 installed near the bearing ring 13 on the irradiation side is shorter than the length of the vertical column 61 of the seismic support 6 installed near the bearing ring 12 by the step L0. It is set to be.

As described above, in the first embodiment, since the gate-shaped seismic supports 6 and 7 are individually installed for the bearing rings 12 and 13, respectively, the horizontal acceleration force and the vertical acceleration force are rotated gantry when an earthquake occurs. Even if it joins 1, the bearing rings 12 and 13 collide with the seismic supports 6 and 7, respectively, and excessive movement is suppressed. Therefore, it is necessary to surely prevent the occurrence of a problem that the bearing rings 12 and 13 on the incident side and the irradiation side of the rotary gantry 1 are derailed from the rollers 22 and 32 of the support devices 2 and 3 and the rotary gantry 1 falls. Can be done.

Embodiment 2.
FIG. 4 is a perspective view showing a main part including a rotating gantry of the particle beam therapy apparatus according to the second embodiment of the present invention, and FIG. 5 is a front view and a view of the rotating gantry of the second embodiment as viewed from the incident side of the particle beam. 6 is a front view of the rotating gantry of the second embodiment as viewed from the irradiation side of the particle beam. In FIGS. 4 to 6, components corresponding to or corresponding to the first embodiment shown in FIGS. 1 to 3 are designated by the same reference numerals.

In the second embodiment as well, as in the case of the first embodiment, the gate-shaped seismic support 6 is installed so as to surround the outer periphery of the bearing ring 12 on the incident side with respect to the bearing ring 12 on the incident side. The seismic support 6 includes a pair of linear vertical columns 61 erected vertically from the left and right on the radial outer side of the bearing ring 12 with respect to the floor surface F1 of the building, and above the outer periphery of the bearing ring 12. It is composed of a beam 62 that connects the upper portions of the pair of vertical columns 61 through the beam 62.

Each vertical column 61 is composed of two members, an upper vertical column 61a and a lower vertical column 61b, and the butt ends of the upper and lower vertical columns 61a and 61b are integrated by bolting or the like. The lower end of the lower vertical column 61b is integrated with the base plate 64 fixed to the floor surface F1 of the building by bolting or the like.

Further, the seismic support 6 is integrally provided with a linear upper inclined support 63a for connecting the upper vertical support 61a and the beam 62 to each other by welding or the like. As a result, the upper vertical column 61a, the beam 62, and the upper inclined column 63a form a right triangle.

Further, in the middle portion of the lower vertical column 61b, a horizontal column 65 extending horizontally from the lower vertical column 61b toward the outside along the floor surface F2 of the building so as to be separated from the rotating gantry 1 is integrated by welding or the like. Is fixed. A linear lower inclined column 63b that connects the overhanging end of the horizontal column 65 and the upper end of the lower vertical column 61b to each other is integrally provided by welding or the like. As a result, the lower vertical column 61b, the horizontal column 65, and the lower inclined column 63b form a right triangle. Further, the horizontal column 65 is fixed to the base plate 66 fixed to the floor surface F2 of the building by bolting or the like via a fixing bracket 67.
As the upper vertical column 61a, the lower vertical column 61b, the upper inclined column 63a, the lower inclined column 63b, and the horizontal column 65, for example, H-shaped steel is preferably used.

As described above, the gate-shaped seismic support 6 provided for the bearing ring 12 on the incident side is reinforced by using the upper inclined column 63a, the horizontal column 65, and the lower inclined column 63b. The seismic support 6 on the incident side, which has higher strength than the case of 1, can be realized.

On the other hand, for the bearing ring 13 on the irradiation side, a gate-shaped seismic support 7 is installed so as to surround the outer periphery of the bearing ring 13. The seismic support 7 includes a pair of linear vertical columns 71 erected vertically from the left and right on the radial outside of the bearing ring 13 with respect to the floor surface F2 of the building, and above the outer periphery of the bearing ring 13. It is composed of a beam 72 that connects the upper portions of the pair of vertical columns 71 through the beam 72.

Each vertical column 71 is composed of two members, an upper vertical column 71a and a lower vertical column 71b, and the butt ends of the upper and lower vertical columns 71a and 71b are integrated by bolting or the like. The lower end of the lower vertical column 71b is integrated with the base plate 74 fixed to the floor surface F2 of the building by bolting or the like.

Further, the seismic support 7 is integrally provided with a linear upper inclined column 73a for connecting the upper vertical column 71a and the beam 72 to each other by welding or the like. As a result, the upper vertical column 71a, the beam 72, and the upper inclined column 73a form a right triangle.

Further, the base plate 74 is provided so as to project horizontally from the lower vertical column 71b toward the outside along the floor surface F2 of the building so as to be separated from the rotating gantry 1. A linear lower inclined column 73b that connects the overhanging end of the base plate 74 and the upper end of the lower vertical column 71b to each other is integrally provided by welding or the like. As a result, the lower vertical column 71b, the base plate 74, and the lower inclined column 73b form a right triangle.
As the upper vertical column 71a, the lower vertical column 71b, the upper inclined column 73a, and the lower inclined column 73b, for example, H-shaped steel is preferably used.

As described above, the gate-shaped seismic support 7 provided for the bearing ring 13 on the irradiation side is reinforced by using the upper inclined column 73a and the lower inclined column 73b. Therefore, in the case of the first embodiment, It is possible to realize seismic support on the irradiation side with higher intensity.

Further, in the second embodiment, the vertical columns 61 and 71 of the seismic supports 6 and 7 on the incident side and the irradiation side have two members, the upper vertical columns 61a and 71a and the lower vertical columns 61b and 71b, respectively. In combination, the two are integrally joined. As a result, the upper vertical columns 61a and 71a and the lower vertical columns 61b and 71b can be individually truck-transported at the stage of installing and assembling the seismic supports 6 and 7 in the building, so that a large trailer can be transported during transportation. It is not necessary to use the plumb bob, and the transportation cost can be suppressed.

Further, in the second embodiment, the upper inclined columns 63a and 73a of the seismic supports 6 and 7 on the incident side and the irradiation side are provided with bearing rings at opposite positions where the gap between the bearing rings 12 and 13 is minimized. The shock absorbers 8 and 9 for alleviating the force of the 12 and 13 colliding with the upper inclined columns 63a and 73a are fixed by fastening with bolts.

Since the shock absorbers 8 and 9 all have the same configuration, for example, the shock absorber 8 provided on the upper inclined column 63a of the seismic support 6 on the incident side will be described. As shown in FIG. 7, the shock absorber 8 is configured such that a plate 81 is arranged on a surface facing the bearing ring 12 and a liner 82 is interposed between the plate 81 and the upper inclined column 63a. Therefore, even if the accuracy of the building or the installation accuracy of the rotating gantry 1 and the seismic support 6 is poor, the gap between the plate 81 and the bearing ring 12 can be adjusted by changing the thickness and the number of liners 82. , The gap between the plate 81 and the bearing ring 12 can be set to, for example, 10 mm or less.

By adjusting the thickness and the number of liners 82 of the shock absorber 8 in this way to reduce the gap between the plate 81 and the bearing ring 12, the bearing ring 12 is likely to get over the roller 22 and derail in the event of an earthquake. Even in such a case, since the bearing ring 12 collides with the plate 81 of the shock absorber 8 and its movement is restricted before that, the rotation gantry 1 can be reliably prevented from tipping over.

Moreover, by reducing the gap between the shock absorber 8 and the bearing ring 12, the moving distance of the rotating gantry 1 is shortened when an earthquake occurs, so that the impact energy generated when the rotating gantry 1 collides with the seismic support 6 is reduced. It also has the effect of

Further, by selecting a material having a hardness lower than that of the bearing ring 12 (for example, iron, aluminum, etc.) as the material of the plate 81 and the liner 82 constituting the shock absorber 8, the bearing ring 12 can be used as a shock absorber in the event of an earthquake. Even if it collides with 8, the shock absorber 8 is only damaged, and damage to the bearing ring 12 can be avoided. After an earthquake, restoration is possible simply by replacing the plate 81 and liner 82 of the shock absorber 8.

Although the shock absorber 8 provided on the upper inclined column 63a of the seismic support 6 on the incident side has been described here, the same applies to the shock absorber 9 provided on the upper inclined column 73a of the seismic support 7 on the irradiation side. Actions and effects can be expected.

In the second embodiment, it is preferable to provide both the upper inclined columns 63a and 73a and the lower inclined columns 63b and 73b for the seismic supports 6 and 7 on the incident side and the irradiation side in order to maintain high strength. However, it is also possible to omit either the upper inclined columns 63a and 73a and the lower inclined columns 63b and 73b. Further, here, the upper inclined columns 63a and 73a and the lower inclined columns 63b and 73b are configured by using separate members, but they are vertically extended toward the floor surfaces F1 and F2 of the building. It is also possible to configure a single inclined column that is inclined with respect to the columns 61 and 71.

Further, in the second embodiment, the relationship between the lengths of the vertical columns 61 and 71 of the seismic supports 6 and 7 on the incident side and the irradiation side and the relationship between the lengths of the beams 62 and 72 are the cases of the first embodiment. The same applies to the above, and detailed description thereof will be omitted here. Further, since the other configurations, actions, and effects are basically the same as those of the first embodiment shown in FIGS. 1 to 3, detailed description thereof will be omitted here.

Embodiment 3.
FIG. 8 is a perspective view showing a main part including a rotating gantry of the particle beam therapy apparatus according to the third embodiment of the present invention, and the components corresponding to or corresponding to the second embodiment shown in FIGS. 4 to 6 are included. Give the same code.

A maintenance deck for maintaining the equipment mounted on the rotary gantry 1 by diverting the seismic supports 6 and 7 on the incident side and the irradiation side of the first embodiment or the second embodiment as columns. 5 can be installed.

This eliminates the need to set up columns on the floors F1 and F2 of the building separately from the seismic supports 6 and 7 on the incident side and the irradiation side to install the maintenance deck 5 separately, thus realizing low cost and space saving. can do.

The present invention is not limited to the configurations of the above-described first to third embodiments, and a part of the configurations of the respective embodiments may be changed within a range not deviating from the gist of the present invention. The configuration can be omitted, and the configurations of the first to third embodiments can be combined.

For example, in the above-described first to third embodiments, the seismic supports 6 and 7 have a gate shape including a pair of left and right vertical columns 61, 71 and beams 62, 72. The beam is not limited to a trapezoidal shape that expands toward the floor surfaces F1 and F2, and the beams 62 and 72 are not limited to the linear shape and are the outer circumferences of the bearing rings 12 and 13. It may be an arc shape along the line.

Further, in the above-described first to third embodiments, the vertical columns 61 provided on the seismic support 6 on the incident side and the vertical columns 71 provided on the seismic support 7 on the irradiation side are at the heights of the floor surfaces F1 and F2. Although the lengths are different depending on the situation, the vertical columns 61 and 71 may have the same length as long as the floor surfaces F1 and F2 are on the same plane.

1 rotating gantry, 11 fuselage, 12 bearing ring on the incident side,
13 Irradiation side bearing ring, 14 cable spool, 15 spool cone,
2 Supporting device on the incident side, 22 rollers, 3 Supporting device on the irradiation side, 32 rollers,
4 Treatment table, 5 Maintenance deck, 6 Seismic support on the incident side, 61 Vertical columns, 61a Upper vertical columns, 61b Lower vertical columns, 62 Beams, 63a Upper inclined columns,
63b Lower tilted column, 65 Horizontal column, 7 Irradiation side seismic support, 71 Vertical column, 71a Upper vertical column, 71b Lower vertical column, 72 Beam, 73a Upper inclined column,
73b Lower tilted column, 8 shock absorbers, 81 plates, 82 liners, 9 shock absorbers,
F1, F2 The floor of the building.

Claims (9)

It is equipped with a rotatable rotary gantry equipped with an irradiation device that irradiates the patient with particle beams accelerated by an accelerator. The rotary gantry is provided with annular bearing rings at both ends of a cylindrical body portion in the direction of the rotation axis. A support device having at least two rollers for rotationally supporting the bearing ring is arranged below each of the bearing rings and fixed to the building, and at least one of the bearing rings , A particle beam therapy device provided with a seismic support fixed to the building so as to surround at least the upper half of the outer circumference of the bearing ring. The particle beam therapy device according to claim 1, wherein the seismic support is formed in a gate shape surrounding the outer periphery of the bearing ring. The seismic support includes a pair of left and right vertical columns that are erected in the vertical direction with respect to the floor surface of the building on the radial outside of the bearing ring, and a pair of left and right vertical columns that pass above the outer circumference of the bearing ring. The particle beam therapy apparatus according to claim 2, further comprising a beam connecting the upper portions of the columns. The particle beam therapy apparatus according to claim 3, wherein the seismic support is provided with an inclined column that is inclined with respect to a vertical column so as to spread toward the floor surface of the building. The particle beam therapy according to claim 4, wherein the inclined column includes an upper inclined column connecting the vertical column and the beam, and forms a right triangle with the vertical column, the beam, and the upper inclined column. apparatus. The fifth aspect of the present invention, wherein the upper inclined column is provided with a shock absorber for alleviating the force of the bearing ring colliding with the upper inclined column at a facing portion where the gap with the bearing ring is minimized. Particle beam therapy device. The inclined column includes a lower inclined column that connects an intermediate portion of the vertical column and the floor surface of the building or a horizontal column mounted horizontally to the floor surface, and the vertical column and the lower column. The particle beam therapy apparatus according to any one of claims 4 to 6, wherein a right-angled triangle is formed by the side inclined column and the floor surface of the building or the horizontal column. The particle beam therapy apparatus according to any one of claims 3 to 7, wherein the vertical support is formed by combining upper and lower portions. The particle beam therapy apparatus according to any one of claims 1 to 8, wherein a deck used for maintenance of equipment mounted on the rotating gantry is provided above the seismic support. ..

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