Particle beam therapy device

Abstract

To provide a particle ray treatment device for improving maintainability of electromagnets inside a rotation shaft.SOLUTION: A particle ray treatment device 1 includes a hollow rotation shaft 30 where electromagnets 22, 24 for controlling a particle ray are internally arranged and which is provided rotatable by a power source 36. Since the rotation shaft 30 has a hollow structure, a space having a predetermined largeness is obtained inside. Thus, the electromagnets 22, 24 can be arranged in an inner space of the rotation shaft 30. Openings 60 are formed in the rotation shaft 30. The particle ray treatment device 1 enables an operator to perform access to an inner side of the rotation shaft 30 via the openings 60. Thus, the operator can perform access to the inner side of the rotation shaft 30 via the openings 60, so as to maintain the electromagnets 22, 24 in the space secured inside the rotation shaft 30. Consequently, maintainability of the electromagnets 22, 24 inside the rotation shaft 30 is improved.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a particle beam therapy system. [Background technology]

[0002] Conventionally, as a particle beam therapy device that performs treatment by irradiating an affected area of ​​a patient with a particle beam, for example, the device described in Patent Document 1 is known. In the particle beam therapy device described in Patent Document 1, particle beams accelerated by an accelerator are irradiated from an irradiation unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2012 / 118589 Summary of the Invention [Problem to be solved by the invention]

[0004] When irradiating particle beams from an irradiation unit, a rotating gantry may be provided to rotate the irradiation unit so that irradiation can be performed from various angles. Here, electromagnets are provided inside the rotating gantry to control the aperture and direction of the particle beam. These electromagnets are stored inside the rotating shaft, making them difficult for workers to access. This poses a problem of poor maintenance of the electromagnets during periodic inspections or when an abnormality occurs.

[0005] SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a particle beam therapy system that can improve the ease of maintenance of the electromagnets in the rotating shaft. [Means for solving the problem]

[0006] The particle beam therapy device of the present invention is a particle beam therapy device that irradiates a subject with particle beams, and is equipped with a hollow rotating shaft that has an electromagnet that controls the particle beams arranged inside and is rotatable by a power source, and a support part that rotatably supports the rotating shaft, and a first opening is formed in the rotating shaft, allowing an operator to access the inside of the rotating shaft through the first opening.

[0007] The particle beam therapy device includes a hollow rotating shaft that is rotatable by a power source and has an electromagnet disposed inside to control the particle beam. Because the rotating shaft has a hollow structure, it has a predetermined amount of space inside. Therefore, the electromagnet can be disposed in the space inside the rotating shaft. The rotating shaft has a first opening. The particle beam therapy device allows an operator to access the inside of the rotating shaft through the first opening. Therefore, an operator can access the inside of the rotating shaft through the first opening and perform maintenance on the electromagnet in the space secured inside the rotating shaft. Therefore, the ease of maintenance of the electromagnet inside the rotating shaft can be improved.

[0008] The rotating shaft may have a monocoque structure. In this case, a larger space can be secured inside the rotating shaft compared to a rotating shaft with a frame structure. Also, it becomes easier to form the first opening in the rotating shaft.

[0009] The support part may have a housing that accommodates the rotating shaft, and a second opening may be formed in the housing, allowing an operator to access the inside of the rotating shaft through the first opening and the second opening. In this case, even if the housing is provided on the outside of the rotating shaft, an operator can easily access the inside of the rotating shaft by passing through the second opening.

[0010] The support portion may have a roller member that applies a rotational driving force to the rotating shaft. In this case, it is not necessary to provide a bearing for the rotating shaft, and therefore it is possible to omit the housing. This reduces the need for structures around the rotating shaft, making it easier to access the inside of the rotating shaft.

[0011] The particle beam therapy device further includes a cable housing that houses a cable connected to the electromagnet, and the cable housing is attached so as to be able to be wound around the rotation shaft and may be pulled out from one side as viewed from the axial direction along which the center line of the rotation shaft extends. In this case, by rotating the rotation shaft at a specific angle, it is possible to avoid the cable housing and access the inside of the rotation shaft.

[0012] The support part has a housing that houses the rotating shaft, and the housing may have a second opening formed on the opposite side of the cable housing from the outlet side as viewed in the axial direction. In this case, the inside of the rotating shaft can be easily accessed from the opposite side of the cable housing from the outlet side through the second opening.

[0013] One end side in the direction along the rotating shaft may be opened so as to allow an operator to access the inside of the rotating shaft from the one end side. In this case, an operator can access the inside from the one end side of the rotating shaft to perform maintenance on the electromagnet.

[0014] A bearing may be provided on one end of the rotating shaft, allowing workers to access the interior of the rotating shaft from the inner circumferential side of the bearing. Supporting the rotating shaft using a bearing with a large space on its inner circumferential side prevents the opening from being blocked by the support structure on the one end of the rotating shaft. This allows workers to access the interior of the rotating shaft from the inner circumferential side of the bearing without being obstructed.

[0015] The particle beam therapy device includes an irradiation unit that irradiates a target object with particle beams and a support frame that supports the irradiation unit, and a counterweight may be provided on the support frame side. In this case, the counterweight is positioned so as not to obstruct an operator's access to the interior of the rotating shaft, thereby facilitating access to the interior of the rotating shaft. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a particle beam therapy system that can improve the ease of maintenance of the electromagnets in the rotating shaft. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic configuration diagram showing a particle beam therapy system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic perspective view of the vicinity of a rotating gantry of the particle beam therapy device. [Figure 3] FIG. 2 is a schematic side view of the vicinity of a rotating gantry of the particle beam therapy device. [Figure 4] FIG. 2 is a schematic view of the rotation shaft as seen from above. [Figure 5] FIG. 2 is a schematic view of a rotation shaft viewed from the axial direction. [Figure 6] FIG. 2 is a schematic view of a rotation shaft viewed from the axial direction. [Figure 7] FIG. 10 is a schematic side view of the vicinity of a rotating gantry of a particle beam therapy device according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, the same or equivalent parts will be designated by the same reference numerals, and redundant description will be omitted.

[0019] 1 is a schematic diagram showing the configuration of a particle beam therapy system 1 according to one embodiment of the present invention. The particle beam therapy system 1 is a system used for cancer treatment by radiation therapy, etc. The particle beam therapy system 1 includes an accelerator 3 that accelerates charged particles generated in an ion source device and emits the particles as a particle beam, an irradiation unit 2 that irradiates an object to be irradiated with the particle beam, and a beam transport line 21 that transports the particle beam extracted from the accelerator 3 to the irradiation unit 2.

[0020] The irradiation unit 2 is attached to a rotating gantry 5 that is provided so as to surround the treatment table 4. The irradiation unit 2 can be rotated around the treatment table 4 by the rotating gantry 5. The beam transport line 21 enters the rotating gantry 5 from the rear end side. Then, the beam transport line 21 changes the trajectory of the particle beam toward the outer periphery by a bending electromagnet 22 (see FIG. 3), and then the trajectory of the particle beam is significantly bent by a bending electromagnet 23 so that the particle beam enters the irradiation unit 2 from the outer periphery side.

[0021] FIG. 2 is a schematic perspective view of the rotating gantry 5 and its vicinity in the particle beam therapy system 1 of FIG. 1. FIG. 3 is a schematic side view of the rotating gantry 5 and its vicinity in the particle beam therapy system 1 of FIG. 1. In FIGS. 2 and 3, the cylindrical outer wall of the rotating gantry 5 is omitted, and the electromagnets and support frame are shown. In the following description, the terms "X-axis direction," "Y-axis direction," and "Z-axis direction" are used. The "Z-axis direction" refers to the depth direction of particle beam irradiation from the irradiation unit 2. The "X-axis direction" refers to a direction in a plane perpendicular to the Z-axis direction, in which the rotation center line of the rotating gantry 5 extends. The side of the rotating gantry 5 where the treatment table 4 is installed is the positive side in the X-axis direction. The positive side in the X-axis direction may be referred to as the "front," and the negative side may be referred to as the "rear." The "Y-axis direction" refers to a direction perpendicular to the X-axis direction in a plane perpendicular to the Z-axis direction.

[0022] 2 and 3, the rotating gantry 5 of the particle beam therapy system 1 includes a rotation axis 30, a support unit 31, and a support frame 32. In the following description, the irradiation unit 2 is assumed to be positioned directly above the center line CL.

[0023] The rotating shaft 30 is a hollow member rotatable by a power source and has electromagnets disposed therein that control the particle beam. The rotating shaft 30 rotates around the center line CL of the rotating gantry 5. The rotating shaft 30 is a cylindrical member extending in the front-to-rear direction along the center line CL. In the internal space of the rotating shaft 30, a quadrupole electromagnet 24 and a bending electromagnet 22 are disposed, in this order from the downstream side. The quadrupole electromagnet 24 is an electromagnet that controls the particle beam by constricting the particle beam. The bending electromagnet 22 is an electromagnet that controls the particle beam by deflecting the particle beam transported along the center line CL in a direction inclined with respect to the center line CL.

[0024] The rotating shaft 30 has a monocoque structure. Unlike a rotating shaft formed by combining multiple frame members to form a framework structure, the monocoque structure rotating shaft 30 is a rotating shaft formed by shaping a single plate member into a cylindrical shape. Therefore, a large space is secured inside the rotating shaft 30 without the need for a reinforcing frame or the like.

[0025] A drive disk 33 is provided at the front end of the rotary shaft 30. The drive disk is a flat, circular member that extends from the front end of the rotary shaft 30 toward the outer periphery. As shown in FIG. 3 , a drive chain 34 is wound around the outer periphery of the drive disk 33. The drive chain 34 is connected to a winding device 37 that includes a power source 36. The winding device 37 is provided below the drive disk 33, and can rotate the drive disk 33 by winding or unwinding the drive chain 34. In this manner, the rotation of the drive disk 33 rotates the rotary shaft 30. The rotary shaft 30 (i.e., the irradiation unit 2) can rotate 360° around the center line CL. However, the rotatable angle of the rotary shaft 30 is not particularly limited, and it does not have to be 360° rotatable.

[0026] A brake disc 38 is provided at the rear end of the rotating shaft 30. The brake disc 38 is a flat, circular member that extends from the rear end of the rotating shaft 30 toward the outer periphery. The brake disc is a member that applies a braking force to the rotating shaft 30 when a brake pad is pressed against it. As shown in FIG. 2 , a space is provided in an area on the inner periphery of the brake disc 38. The rear end of the rotating shaft 30 is also open and not blocked. The space on the inner periphery of the brake disc 38 and an opening 40 at the rear end of the rotating shaft 30 are in communication with each other. Therefore, the internal space of the rotating shaft 30 is open to the outside at the rear of the rotating shaft 30 (one end side in the direction along the rotating shaft 30).

[0027] The support part 31 rotatably supports the rotating shaft 30. As shown in FIG. 3 , in this embodiment, the support part 31 includes bearings 41 and 42 and a housing 43. The bearing 41 is provided on the front side of the rotating shaft 30 and is an annular member that rotatably supports the rotating shaft 30. The bearing 42 is provided on the rear side (one end side) of the rotating shaft 30 and is an annular member that rotatably supports the rotating shaft 30. The bearings 41 and 42 are provided on the outer peripheral surface of the rotating shaft 30.

[0028] The housing 43 is a box that houses the rotating shaft 30. The housing 43 is fixed to a base 100 on the building side that is provided below the rotating shaft 30. The housing 43 supports the bearings 41 and 42 provided on the rotating shaft 30 from the outer periphery and fixes the positions of the bearings 41 and 42. This allows the rotating shaft 30 to rotate while being supported by the housing 43 and the base 100 via the bearings 41 and 42.

[0029] As shown in Fig. 2, the housing 43 includes a base portion 46, a lower case 47, and an upper case 48. The base portion 46 supports the lower case 47 and the upper case 48 from below, and is fixed to a base portion 100 (see Fig. 3). The lower case 47 houses a lower portion of the rotating shaft 30. The upper case 48 houses an upper portion of the rotating shaft 30. The upper case 48 includes a pair of side walls 48a extending in the vertical direction, a pair of inclined walls 48b inclined in an oblique direction, and an upper wall 48c extending in the horizontal direction.

[0030] 2 and 3, the support frame 32 is a frame structure that supports the irradiation unit 2. The support frame 32 is provided on the front side of the rotation axis 30. The support frame 32 includes a connection portion 51, an inclined portion 52, a swiveling portion 53, and a counterweight mounting portion 54. The support frame 32 is not supported by the structure of the building. Therefore, the rotating gantry 5 has a cantilever support structure in which it is supported by a base portion 100 at the position of the rotation axis 30.

[0031] The connecting portion 51 is a portion that is connected to the front end of the rotating shaft 30. The connecting portion 51 is fixed to the front end of the rotating shaft 30 at the position of the center line CL. The inclined portion 52 is a portion that extends while inclining obliquely upward as it extends toward the front. The inclined portion 52 is connected to the upper side of the connecting portion 51. The inclined portion 52 is provided with a quadrupole electromagnet 26 that focuses the particle beam. The swiveling portion 53 is a portion that swivels downward at the upper end of the inclined portion 52. The irradiation unit 2 is provided at the tip of the swiveling portion 53. In addition, the bending electromagnet 23 is provided at the swiveling portion. The bending electromagnet 23 bends the trajectory of the particle beam transported from the rotating shaft 30 via the quadrupole electromagnet 26 so as to swivel it, and transports it to the irradiation unit 2. The counterweight mounting portion 54 is a portion to which a counterweight 56 ​​is attached. The counterweight mounting portion 54 extends on the opposite side of the center line CL from the inclined portion 52, i.e., extends so as to slope downward. A counterweight 56 ​​is attached to the lower end of the inclined portion 52. In this way, the counterweight 56 ​​is provided on the rotating gantry 5 on the support frame 32 side.

[0032] Here, the particle beam therapy system 1 according to this embodiment has a structure that allows an operator to access the inside of the rotating shaft 30. Next, the structure for accessing the inside of the rotating shaft 30 will be described.

[0033] FIG. 4 is a schematic diagram of the rotating shaft 30 as viewed from above. FIG. 5 is a schematic diagram of the rotating shaft 30 as viewed from the axial direction. As shown in FIGS. 4 and 5, an opening 60 (first opening) is formed in the rotating shaft 30. The particle beam therapy system 1 allows an operator to access the interior of the rotating shaft 30 through the opening 60. In FIG. 4, the grayed-out areas correspond to the openings 60. In this embodiment, four openings 60A, 60B, 60C, and 60D are formed in the rotating shaft 30 at a constant pitch (here, 90° pitch). The shapes of the openings 60A, 60B, 60C, and 60D are not particularly limited, but in this embodiment, they have a rectangular shape with their longitudinal direction in the X-axis direction. In the X-axis direction, the openings 60A, 60B, 60C, and 60D are formed in the region between the front bearing 41 and the rear bearing 42. The pitch and number of the openings 60 are not particularly limited.

[0034] As shown in FIG. 5 , an opening 70 (second opening) is formed in the housing 43. The particle beam therapy system 1 allows an operator to access the interior of the rotating shaft 30 through the opening 60 in the rotating shaft 30 and the opening 70 in the housing 43. In this embodiment, the opening 70 is provided in the housing 43 at the position of the inclined wall portion 48b (see the grayed-out portion in FIG. 2 ). The opening 70 has a rectangular shape with its longitudinal direction aligned with the X-axis direction. The opening 60 in the rotating shaft 30 moves as the rotating shaft 30 rotates. On the other hand, since the housing 43 does not rotate, the position of the opening 70 in the housing 43 remains stationary. Therefore, when the opening 60 in the rotating shaft 30 and the opening 70 in the housing 43 overlap when viewed from the outside, access from the outside is possible through the openings 60 and 70.

[0035] The size of the openings 60, 70 for providing access to the interior of the rotating shaft 30 will now be described. The openings 60, 70 may have a minimum dimension of 12 inches or more. There are regulations (e.g., U.S. OSHA Part 1910 Occupational Safety and Health Regulations) that stipulate that openings with a minimum dimension of 12 inches or more are openings in floors, platforms, paved roads, material storage areas, and the like that pose a risk of a person falling through them. In other words, ensuring a minimum dimension of 12 inches or more ensures that a worker can pass through the openings 60, 70. The openings 60, 70 may also have a minimum dimension of 24 inches or more. Providing an opening width twice the 12 inches ensures smooth access. Note that the minimum dimension refers to the shortest dimension in the case of a rectangular opening. In addition, the minimum dimension refers to the shortest dimension in the case of an ellipse, or the shortest dimension between opposing edges in the case of a polygon.

[0036] As shown in FIG. 6 , the particle beam therapy system 1 may include a cable bear 80 (registered trademark, cable housing) that houses a cable 81 connected to the electromagnets. The cable bear 80 is attached so as to be able to be wound around the rotating shaft 30, and is pulled out from one side (the positive side in the Y-axis direction) when viewed from the axial direction along which the center line CL of the rotating shaft 30 extends. The cable 81 is pulled out from a device 82 provided at a position on the positive side of the rotating shaft 30 in the Y-axis direction, and is guided to the rotating shaft 30 while being bundled by the cable bear 80. One end of the cable bear 80 is fixed to a fixing portion 83 disposed below the device 82. The cable bear 80 is then attached to the rotating shaft 30 via an attachment portion 84 in a state in which it hangs between the fixing portion 83 and the rotating shaft 30. The cable 81 enters the interior of the rotating shaft 30 from the attachment portion 84 and is connected to each electromagnet. When the rotating shaft 30 rotates, the end of the cable bear 80 also rotates together with the attachment portion 84. As a result, the cable bear 80 is wound around the outer circumferential surface of the rotating shaft 30. At this time, the hanging portion of the cable bear 80 between the fixed part 83 and the rotating shaft 30 becomes short (see the imaginary line in FIG. 6).

[0037] The cable bear 80 has a shape that is flat in the width direction and is wound around the rotating shaft 30 so as to occupy a predetermined region in the axial direction (see the grayscale region in FIG. 2 ). Therefore, a structure is adopted in which the cable bear 80 does not block the opening 60. Specifically, the cable bear 80 is configured so that it is pulled out only from one side (the positive side in the Y-axis direction) when viewed from the axial direction along which the center line CL of the rotating shaft 30 extends, and is not pulled out from the other side (the negative side in the Y-axis direction). This makes it easy to access the cable bear 80 from the opposite side from where it is pulled out (the negative side in the Y-axis direction). Also, as shown in FIG. 5 , an opening 60A is formed in the housing 43 on the opposite side from where the cable bear 80 is pulled out when viewed from the axial direction. Note that in this embodiment, an opening 60B is also formed in the housing 43 on the side where the cable bear 80 is pulled out.

[0038] Next, with reference to FIG. 5, the relationship between the rotation angle of the rotating shaft 30 and the winding state of the cable bear 80 will be described. For ease of explanation, the state shown in FIG. 5(c) is assumed to be a state where the rotation angle is 0°. When the rotation angle is 0°, the installation position of the cable bear 80 is located at the end on the positive side in the Y-axis direction. When the opening 60A is not blocked, it overlaps with the opening 70B, and when the opening 60B is not blocked, it overlaps with the opening 70A. In this case, access is possible from the openings 60A and 70B and the openings 60B and 70A. As shown in FIG. 5(a), when the rotation angle of the rotating shaft 30 reaches 90°, the opening 60D, which is blocked by the cable bear 80, is located at the position of the opening 70B. At this time, when the opening 60A is not blocked, it overlaps with the opening 70A. In this case, access is possible from the openings 60A and 70A. As shown in Figure 5(b), when the rotation angle of the rotating shaft 30 reaches 270°, opening 60B blocked by the cable bear 80 is located at the position of opening 70B, and opening 60C blocked by the cable bear 80 is located at the position of opening 70A. As shown in Figure 5(d), when the rotation angle of the rotating shaft 30 reaches 360°, opening 60A blocked by the cable bear 80 is located at the position of opening 70B, and opening 60B blocked by the cable bear 80 is located at the position of opening 70A. Therefore, if the state shown in Figure 5(b) or (d) during maintenance is such that the rotating shaft 30 is rotated to the state shown in Figure 5(a) or 5(c), the interior of the rotating shaft 30 can be accessed.

[0039] The rear (one end) of the rotating shaft 30 is open to allow an operator to access the interior of the rotating shaft 30 from the rear side (one end). As described above, the interior space of the rotating shaft 30 is open to the outside at the rear of the rotating shaft 30 through an opening 40 (see FIG. 2 ) at the rear end of the rotating shaft 30. As shown in FIG. 3 , a gap SP is provided between the opening 40 at the rear end of the rotating shaft 30 and the wall 101 of the building behind the rotating gantry 5. This gap SP is large enough to allow an operator to pass through. Therefore, an operator can go around to the rear end of the rotating shaft 30 through the gap SP and access the interior of the rotating shaft 30 through the opening 40. A bearing 42 is provided on the rear side of the rotating shaft 30. That is, the rear of the rotating shaft 30 is supported by the bearing 42, which has a large space on its inner periphery, rather than by a support structure that blocks the opening 40 or obstructs passage through the opening 40. Therefore, an operator can access the inside of the rotating shaft 30 from the inner peripheral side of the bearing 42.

[0040] Next, the actions and effects of the particle beam therapy system 1 according to this embodiment will be described.

[0041] The particle beam therapy system 1 includes a hollow rotating shaft 30 that is rotatable by a power source 36 and has electromagnets 22 and 24 disposed therein for controlling particle beams. The rotating shaft 30 has a hollow structure, providing a predetermined amount of space therein. Therefore, the electromagnets 22 and 24 can be disposed in the space inside the rotating shaft 30. An opening 60 is formed in the rotating shaft 30. The particle beam therapy system 1 allows an operator to access the interior of the rotating shaft 30 through the opening 60. Therefore, an operator can access the interior of the rotating shaft 30 through the opening 60 and perform maintenance on the electromagnets 22 and 24 in the space secured inside the rotating shaft 30. This improves the ease of maintenance of the electromagnets 22 and 24 inside the rotating shaft 30.

[0042] Furthermore, in the case of an assembled rotating shaft, the rotating shaft needs to be removed for maintenance. However, in this case, it is difficult to restore the rotating shaft to its pre-maintenance state, which may result in problems such as deviations in the particle beam. In contrast, in this embodiment, the worker can perform maintenance work inside the rotating shaft 30, thereby avoiding the above-mentioned problems.

[0043] The rotating shaft 30 may have a monocoque structure. In this case, a larger space can be secured inside the rotating shaft 30 compared to a rotating shaft with a frame structure. Also, it becomes easier to form the opening 60 in the rotating shaft 30.

[0044] The support part 31 has a housing 43 that houses the rotating shaft 30, and an opening 70 is formed in the housing 43, and an operator may be able to access the inside of the rotating shaft 30 through the openings 60 and 70. In this case, even if the housing 43 is provided on the outside of the rotating shaft 30, an operator can easily access the inside of the rotating shaft 30 by passing through the openings 70.

[0045] The particle beam therapy system 1 further includes a cable bear 80 that houses a cable 81 connected to the electromagnets 22, 24. The cable bear 80 is attached so as to be able to be wound around the rotating shaft 30, and may be drawn out from one side as viewed from the axial direction along which the center line CL of the rotating shaft 30 extends. In this case, by rotating the rotating shaft 30 at a specific angle (see, for example, FIGS. 5(a) and 5(c)), it becomes possible to access the inside of the rotating shaft 30 while avoiding the cable bear 80.

[0046] The support part 31 has a housing 43 that houses the rotating shaft 30, and an opening 70 may be formed in the housing 43 on the side opposite the side where the cable bear 80 is pulled out, as viewed in the axial direction. In this case, the interior of the rotating shaft 30 can be easily accessed through the opening 70 from the side opposite the side where the cable bear 80 is pulled out.

[0047] One end side of the rotating shaft 30 may be opened so as to allow an operator to access the inside of the rotating shaft 30 from the one end side. In this case, an operator can also access the inside from the rear side of the rotating shaft 30 to perform maintenance on the electromagnets 22, 24.

[0048] A bearing 42 may be provided on one end side of the rotating shaft 30, and an operator may be able to access the interior of the rotating shaft 30 from the inner circumferential side of the bearing 42. Supporting the rotating shaft 30 using the bearing 42 with a large space on the inner circumferential side prevents the opening from being blocked by the support structure on one end side of the rotating shaft 30. This allows an operator to access the interior of the rotating shaft 30 from the inner circumferential side of the bearing 42 without being obstructed.

[0049] The particle beam therapy device 1 includes an irradiation unit 2 that irradiates a subject with particle beams and a support frame 32 that supports the irradiation unit 2. A counterweight 56 ​​may be provided on the support frame 32 side. In this case, the counterweight 56 ​​is positioned so as not to obstruct an operator's access to the inside of the rotating shaft 30, thereby facilitating access to the inside of the rotating shaft 30.

[0050] The present invention is not limited to the above-described embodiments.

[0051] The structure of the support unit 31 that supports the rotating shaft 30 is not limited to the above-described embodiment. For example, a structure such as that shown in FIG. 7 may be employed. The support unit 31 shown in FIG. 7 includes roller members 90, 91, and 92. The roller member 90 applies a rotational driving force to the rotating shaft 30 and supports the weight of the rotating shaft. The roller member 90 is provided below the front side of the rotating shaft 30. The roller member 91 supports the weight of the rotating shaft. The roller member 91 is provided below the rear side of the rotating shaft 30. The roller members 90 and 91 are supported from below by a base portion 94 provided on a base portion 100. The roller member 92 prevents the rotating shaft 30 from lifting up. The roller member 92 is provided above the rear side of the rotating shaft 30. The roller member 92 is supported from above by a retainer 96. In this case, it is not necessary to provide a bearing for the rotating shaft 30 as shown in FIG. 3, and therefore the housing can be omitted. This prevents structures from being provided around the rotating shaft 30, facilitating access to the inside of the rotating shaft 30. Note that even when the roller member 90 is used, a structure in which a housing is provided is not excluded.

[0052] The housing 43 may have either a monocoque structure or a frame structure. The rotating shaft 30 may be hollow, and does not necessarily have to have a monocoque structure.

[0053] The structure of the rotating gantry 5 may be modified as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0054] 1...particle beam therapy device, 22...bending electromagnet (electromagnet), 24...quadrupole electromagnet (electromagnet), 30...rotating shaft, 31...support part, 32...support frame, 36...power source, 43...housing, 56...counterweight, 60...opening (first opening), 70...opening (second opening), 80...cable bear (cable housing), 81...cable, 90...roller member (power source).

Claims

1. A particle beam therapy device that irradiates a particle beam to an irradiation target, a hollow rotary shaft having an electromagnet for controlling the particle beam disposed therein and rotatable by a power source; a support portion that rotatably supports the rotation shaft, the rotation shaft is disposed at a position on the inner circumferential side of the outer circumferential wall of the rotating gantry with respect to a center line of the rotation shaft, A particle beam therapy device, wherein a first opening is formed in the rotating shaft, allowing an operator to access the inside of the rotating shaft through the first opening.

2. The particle beam therapy system according to claim 1 , wherein the rotating shaft has a monocoque structure.

3. the support portion has a housing that accommodates the rotation shaft, 3. The particle beam therapy device according to claim 1, wherein a second opening is formed in the housing, allowing an operator to access an inside of the rotating shaft through the first opening and the second opening.

4. 4. The particle beam therapy system according to claim 1, wherein the support portion has a roller member that applies a rotational driving force to the rotation shaft.

5. a cable housing that houses a cable connected to the electromagnet; 5. The particle beam therapy device according to claim 1, wherein the cable housing is attached so as to be capable of being wound around the rotating shaft, and is pulled out from one side when viewed from an axial direction in which the center line of the rotating shaft extends.

6. the support portion has a housing that accommodates the rotation shaft, 6. The particle beam therapy device according to claim 5, wherein a second opening is formed in the housing on a side opposite to the pull-out side of the cable housing as viewed in the axial direction, allowing an operator to access the inside of the rotating shaft through the first opening and the second opening.

7. 7. The particle beam therapy device according to claim 1, wherein one end side in a direction along the rotation axis is opened to allow an operator to access the inside of the rotation axis from the one end side.

8. 8. The particle beam therapy system according to claim 7, wherein a bearing is provided on the one end side of the rotating shaft, allowing an operator to access the inside of the rotating shaft from an inner peripheral side of the bearing.

9. an irradiation unit that irradiates the particle beam onto the irradiation target; a support frame that supports the irradiation unit, 9. The particle beam therapy system according to claim 1, wherein a counterweight is provided on the support frame side.

Images