Particle beam therapy device

Abstract

Provided is a particle beam therapy device capable of improving the maintainability of electromagnets inside a rotating shaft. A particle beam therapy device (1) includes a hollow rotating shaft (30) having electromagnets (22, 24) for controlling a particle beam arranged inside and rotatably provided by a power source (36). Since the rotating shaft (30) has a hollow structure, it has a space of a prescribed area inside. Therefore, the electromagnets (22, 24) can be arranged inside the space of the rotating shaft (30). Furthermore, an opening (60) is formed in the rotating shaft (30). The particle beam therapy device (1) enables a worker to access the inside of the rotating shaft (30) via the opening (60). Therefore, the worker can access the inside of the rotating shaft (30) via the opening (60) and perform maintenance of the electromagnets (22, 24) in the space ensured inside the rotating shaft (30). Thus, the maintainability of the electromagnets (22, 24) inside the rotating shaft (30) can be improved.

Description

TECHNICAL FIELD

[0001] This application claims priority based on Japanese Patent Application No. 2021-028634 filed on February 25, 2021. The entire contents of the Japanese application are incorporated herein by reference.

[0002] The present application relates to a particle beam therapy device. BACKGROUND

[0003] In the past, as a particle beam therapy device that performs therapy by irradiating a particle beam to a patient's affected part, for example, the device described in Patent Literature 1 is known. In the particle beam therapy device described in Patent Literature 1, a particle beam accelerated by an accelerator is irradiated from an irradiation unit.

[0004] Patent Literature 1: International Publication No. 2012 / 118589

[0005] When a particle beam is irradiated from the irradiation unit, since irradiation is performed from various angles, a rotating gantry for rotating the irradiation unit is sometimes provided. Here, an electromagnet for controlling the convergence of a particle beam or controlling the direction is provided inside the rotating gantry. These electromagnets are disposed in a position where it is difficult for a worker to approach by being housed in a rotating shaft. Therefore, there is a problem that the maintainability of the electromagnets in the case of periodic inspection or when an abnormality occurs is low. SUMMARY

[0006] Therefore, an object of the present application is to provide a particle beam therapy device capable of improving the maintainability of electromagnets in a rotating shaft.

[0007] The particle beam therapy device according to the present application is a particle beam therapy device that irradiates a particle beam to an irradiated body, and includes: a hollow rotating shaft in which an electromagnet that controls a particle beam is disposed inside and is rotatably provided by a power source; and a support portion that rotatably supports the rotating shaft, in which a first opening portion is formed in the rotating shaft, and a worker is able to approach the inside of the rotating shaft via the first opening portion.

[0008] The particle beam therapy device includes: a hollow rotating shaft in which an electromagnet that controls a particle beam is disposed inside and is rotatably provided by a power source. Since the rotating shaft has a hollow structure, it has a space of a prescribed area inside. Therefore, the electromagnet can be disposed in the inside space of the rotating shaft. Further, a first opening portion is formed in the rotating shaft. The particle beam therapy device enables a worker to approach the inside of the rotating shaft via the first opening portion. Therefore, the worker is able to approach the inside of the rotating shaft via the first opening portion and perform maintenance of the electromagnet in the space ensured in the inside of the rotating shaft. Therefore, the maintainability of the electromagnets in the rotating shaft can be improved.

[0009] The rotation shaft can have a hard-shell structure. In this case, the inside of the rotation shaft can be ensured to be larger than that of a rotation shaft having a frame structure. Also, the first opening portion can be easily formed in the rotation shaft.

[0010] The support portion has a housing that accommodates the rotation shaft, and a second opening portion is formed in the housing. A worker can access the inside of the rotation shaft through the first opening portion and the second opening portion. In this case, even if the housing is provided outside the rotation shaft, the worker can easily access the inside of the rotation shaft through the second opening portion.

[0011] The support portion can have a roller member that applies a rotational driving force to the rotation shaft. In this case, since a bearing does not need to be provided with respect to the rotation shaft, the housing can be omitted accordingly. Therefore, since the structure around the rotation shaft can be suppressed, the inside of the rotation shaft can be easily accessed.

[0012] The particle beam therapy apparatus further includes a cable housing that accommodates a cable connected to the electromagnet, the cable housing being wound around the rotation shaft and being able to be drawn out from one side when viewed in an axial direction from a center line of the rotation shaft. In this case, by setting the rotation shaft to a specific rotation angle, the inside of the rotation shaft can be accessed without the cable housing.

[0013] The support portion has a housing that accommodates the rotation shaft, and a second opening portion can be formed in the housing on a side opposite to a drawing side of the cable housing when viewed in an axial direction. In this case, the inside of the rotation shaft can be easily accessed through the second opening portion from the side opposite to the drawing side of the cable housing.

[0014] One end side in a direction of the rotation shaft can be open so that a worker can access the inside of the rotation shaft from the one end side. In this case, the worker can access the inside from the one end side of the rotation shaft, thereby performing maintenance of the electromagnet.

[0015] A bearing is provided at the one end side of the rotation shaft, and a worker can access the inside of the rotation shaft from an inner circumferential side of the bearing. By supporting the rotation shaft using the bearing having a large space in the inner circumferential side, the opening can be prevented from being blocked by a support structure of the one end side of the rotation shaft. Thus, the worker can access the inside of the rotation shaft from the inner circumferential side of the bearing without obstruction.

[0016] The particle beam therapy apparatus includes an irradiation portion that irradiates a particle beam to an irradiated body, and a support frame that supports the irradiation portion. A counterweight can be provided at the support frame. In this case, the counterweight is disposed at a position that does not obstruct a worker from accessing the inside of the rotation shaft, and thus the inside of the rotation shaft can be easily accessed.

[0017] Effects of Invention

[0018] According to the present application, a particle beam therapy device capable of improving the maintenance of electromagnets in a rotating shaft can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic configuration view of a particle beam therapy device according to an embodiment of the present application.

[0020] Figure 2 is a schematic perspective view of the vicinity of a rotating gantry of a particle beam therapy device.

[0021] Figure 3 is a schematic side view of the vicinity of a rotating gantry of a particle beam therapy device.

[0022] Figure 4 is a schematic view of a rotating shaft viewed from above.

[0023] Figure 5 is a schematic view of a rotating shaft viewed from the axial direction.

[0024] Figure 6 is a schematic view of a rotating shaft viewed from the axial direction.

[0025] Figure 7 is a schematic side view of the vicinity of a rotating gantry of a particle beam therapy device according to a modification.

[0026] In the drawing: 1 - particle beam therapy device, 22 - deflection electromagnet (electromagnet), 24 - quadrupole electromagnet (electromagnet), 30 - rotating shaft, 31 - support portion, 32 - support frame, 36 - power source, 43 - housing, 56 - counterweight, 60 - opening portion (first opening portion), 70 - opening portion (second opening portion), 80 - cable carrying tube (cable accommodating body), 81 - cable, 90 - roller member (power source). DETAILED DESCRIPTION

[0027] Hereinafter, a preferred embodiment of the present application will be described in detail with reference to the drawings. In the following description, the same or equivalent portions are denoted by the same reference numerals, and repeated description will be omitted.

[0028] Figure 1 is a schematic configuration view of a particle beam therapy device 1 according to an embodiment of the present application. The particle beam therapy device 1 is a device for cancer treatment or the like using radiation therapy. The particle beam therapy device 1 includes an accelerator 3 that accelerates charged particles generated by an ion source device and emits the charged particles as a particle beam, an irradiation portion 2 that irradiates a particle beam to an irradiated body, and a beam transport line 21 that transports a particle beam emitted from the accelerator 3 to the irradiation portion 2.

[0029] The irradiation section 2 is attached to a rotating gantry 5 disposed in a manner of surrounding the treatment table 4. The irradiation section 2 is rotatable around the treatment table 4 by the rotating gantry 5. A beam transport line 21 enters the rotating gantry 5 from the rear end side of the rotating gantry 5. Further, the beam transport line 21, after changing the track of the particle beam at the outer peripheral side by a deflection electromagnet 22 (refer to Figure 3 ), makes the track of the particle beam largely bend by a deflection electromagnet 23 and enters the irradiation section 2 from the outer peripheral side.

[0030] Figure 2 is a schematic perspective view of the vicinity of the rotating gantry 5 of the particle beam therapy device 1 of Figure 1 . Figure 3 is a schematic side view of the vicinity of the rotating gantry 5 of the particle beam therapy device 1 of Figure 1 . In Figure 2 and Figure 3 , the cylindrical outer peripheral wall portion of the rotating gantry 5 is omitted and the state of the electromagnets or the support frame is shown. In addition, in the following description, the description is made using terms such as "X-axis direction", "Y-axis direction", "Z-axis direction". The "Z-axis direction" refers to the depth direction from the irradiation of the particle beam of the irradiation section 2. The "X-axis direction" refers to one direction in the plane orthogonal to the Z-axis direction and is the direction in which the center line of the rotation of the rotating gantry 5 extends. In addition, in the rotating gantry 5, the side on which the treatment table 4 is disposed is set as the positive side of the X-axis direction. Also, sometimes the positive side of the X-axis direction is referred to as "front" and the negative side is referred to as "rear". The "Y-axis direction" refers to the direction orthogonal to the X-axis direction in the plane orthogonal to the Z-axis direction.

[0031] As shown in Figure 2 and Figure 3 , the rotating gantry 5 of the particle beam therapy device 1 is provided with a rotating shaft 30, a support portion 31, and a support frame 32. In addition, in the following description, the description is made with the state in which the irradiation section 2 is disposed directly above the center line CL as a reference.

[0032] The rotating shaft 30 is a hollow member in which electromagnets that control the particle beam are disposed inside and is rotatably provided by a power source. The rotating shaft 30 rotates around the center line CL of the rotating gantry 5. The rotating shaft 30 is a cylindrical member that extends in the front-rear direction along the center line CL. In the inner space of the rotating shaft 30, a quadrupole electromagnet 24 and a deflection electromagnet 22 are sequentially disposed from the downstream side. The quadrupole electromagnet 24 is an electromagnet that controls the particle beam in a manner of converging the particle beam. The deflection electromagnet 22 is an electromagnet that controls the particle beam in a manner of deflecting the orientation of the particle beam transmitted along the center line CL in a direction inclined with respect to the center line CL.

[0033] The rotary shaft 30 has a hard-shell structure. The hard-shell structure of the rotary shaft 30 is different from a rotary shaft in which a plurality of frame members are combined to form a skeletal structure, and is a rotary shaft in which a single plate member is provided in a cylindrical shape. Therefore, a large space can be ensured in the inside space of the rotary shaft 30 without providing a frame or the like for reinforcement.

[0034] A drive disk 33 is provided at the end portion of the front side of the rotary shaft 30. The drive disk is a flat annular member that extends outward from the end portion of the front side of the rotary shaft 30. As shown in Figure 3 A drive chain 34 is wound around the outer peripheral edge portion of the drive disk 33. The drive chain 34 is connected to a winding device 37 that has a power source 36. The winding device 37 is provided on the lower side of the drive disk 33, and can rotate the drive disk 33 by winding or unwinding the drive chain 34. In this way, the rotary shaft 30 is rotated by rotating the drive disk 33. In addition, the rotary shaft 30 (i.e., the irradiation portion 2) can be rotated 360° around the center line CL. However, the rotatable angle of the rotary shaft 30 is not particularly limited, and can not be 360° rotation.

[0035] A brake disk 38 is provided at the end portion of the rear side of the rotary shaft 30. The brake disk 38 is a flat annular member that extends outward from the end portion of the rear side of the rotary shaft 30. The brake disk is a member that applies a braking force to the rotating rotary shaft 30 by being pressed by a brake pad. As shown in Figure 2 A space is provided in the region of the inner peripheral side of the brake disk 38. In addition, the end portion of the rear side of the rotary shaft 30 is also in a state of being not blocked and being open. The space of the inner peripheral side of the brake disk 38 and the opening portion 40 of the end portion of the rear side of the rotary shaft 30 are in a state of communicating with each other. Therefore, the inside space of the rotary shaft 30 is in a state of being open to the outside at the rear portion of the rotary shaft 30 (one end side in the direction of the rotary shaft 30).

[0036] The support portion 31 rotatably supports the rotary shaft 30. As shown in Figure 3 In the present embodiment, the support portion 31 has bearings 41, 42, and a housing 43. The bearing 41 is provided on the front side of the rotary shaft 30, and is a circular annular member that rotatably supports the rotary shaft 30. The bearing 42 is provided on the rear side (one end side) of the rotary shaft 30, and is a circular annular member that rotatably supports the rotary shaft 30. The bearings 41, 42 are provided on the surface of the outer peripheral side of the rotary shaft 30.

[0037] The housing 43 is a box that houses the rotary shaft 30. The housing 43 is fixed to the base portion 100 provided on the building side below the rotary shaft 30. The housing 43 supports the bearings 41, 42 provided on the rotary shaft 30 from the outer peripheral side and fixes the positions of the bearings 41, 42. Thus, the rotary shaft 30 can be rotated in a state of being supported by the housing 43 and the base portion 100 via the bearings 41, 42.

[0038] As shown in Figure 2 , the housing 43 includes a base portion 46, a lower housing 47, and an upper housing 48. The base portion 46 is a portion that supports the lower housing 47 and the upper housing 48 from the lower side and is a portion that is fixed to the base portion 100 (see Figure 3 ). The lower housing 47 houses a portion of the lower side of the rotary shaft 30. The upper housing 48 houses a portion of the upper side of the rotary shaft 30. In addition, the upper housing 48 includes a pair of side wall portions 48a extending in the vertical direction, a pair of inclined wall portions 48b inclined in the oblique direction, and an upper wall portion 48c extending in the horizontal direction.

[0039] As shown in Figure 2 and Figure 3 , the support frame 32 is a frame structure that supports the irradiation portion 2. The support frame 32 is provided on the front side of the rotary shaft 30. The support frame 32 includes a connection portion 51, an inclined portion 52, a swivel portion 53, and a balance weight mounting portion 54. The support frame 32 is not supported by the structure of the building. Thus, the rotary stand 5 has a cantilever support structure that is supported by the base portion 100 at the position of the rotary shaft 30.

[0040] The connection portion 51 is a portion that is connected to the end portion of the front side of the rotary shaft 30. The connection portion 51 is fixed to the end portion of the front side of the rotary shaft 30 at the position of the center line CL. The inclined portion 52 is a portion that extends in a state of being inclined upward obliquely as it goes toward the front side. The inclined portion 52 is connected to the upper side of the connection portion 51. The quadrupole electromagnet 26 that converges the particle beam is provided on the inclined portion 52. The swivel portion 53 is a portion that is swiveled downward at the upper end portion of the inclined portion 52. The irradiation portion 2 is provided on the front end portion of the swivel portion 53. Further, the deflection electromagnet 23 is provided on the swivel portion. The deflection electromagnet 23 bends the track so as to swivel and transmit the particle beam transmitted from the rotary shaft 30 via the quadrupole electromagnet 26 to the irradiation portion 2. The balance weight mounting portion 54 is a portion that mounts the balance weight 56. The balance weight mounting portion 54 extends in a manner of being inclined to the side opposite to the inclined portion 52, that is, downward, with the center line CL interposed therebetween. The balance weight 56 is mounted to the lower end portion of the inclined portion 52. Thus, the balance weight 56 is provided on the support frame 32 side in the rotary stand 5.

[0041] In this embodiment, the particle beam therapy device 1 has a structure that enables a worker to access the inside of the rotary shaft 30. Next, the structure for accessing the inside of the rotary shaft 30 will be described.

[0042] Figure 4 is a schematic view of the rotary shaft 30 as viewed from above. Figure 5 is a schematic view of the rotary shaft 30 as viewed from the axial direction. As Figure 4 and Figure 5 indicated, the opening portions 60 (first opening portions) are formed in the rotary shaft 30. The particle beam therapy device 1 enables a worker to access the inside of the rotary shaft 30 via the opening portions 60. In Figure 4 , the portion with the gray scale corresponds to the opening portions 60. In this embodiment, four opening portions 60A, 60B, 60C, 60D are formed in the rotary shaft 30 at constant intervals (90° intervals in this case). The shapes of the opening portions 60A, 60B, 60C, 60D are not particularly limited, and in this embodiment, the shapes are rectangular shapes having lengths in the X-axis direction. In the X-axis direction, the opening portions 60A, 60B, 60C, 60D are formed in the region between the front-side bearing 41 and the rear-side bearing 42. The intervals and the number of the opening portions 60 are not particularly limited.

[0043] As Figure 5 indicated, the opening portions 70 (second opening portions) are formed in the housing 43. The particle beam therapy device 1 enables a worker to access the inside of the rotary shaft 30 via the opening portions 60 of the rotary shaft 30 and the opening portions 70 of the housing 43. In this embodiment, the opening portions 70 are provided in the housing 43 at the positions of the inclined wall portions 48b (refer to the portion with the gray scale in Figure 2 ). The opening portions 70 are rectangular shapes having lengths in the X-axis direction. The opening portions 60 of the rotary shaft 30 move as the rotary shaft 30 rotates. On the other hand, since the housing 43 does not rotate, the positions of the opening portions 70 of the housing 43 do not move. Therefore, when the opening portions 60 of the rotary shaft 30 and the opening portions 70 of the housing 43 overlap as viewed from the outside, access can be made from the outside via the opening portions 60, 70.

[0044] The sizes of the openings 60 and 70, which allow access to the interior of the rotating shaft 30, will be explained. The minimum size of the openings 60 and 70 can be 12 inches or more. There is a rule that openings with a minimum size of 12 inches or more are considered openings where a person might fall in, such as on the ground, workbench, paved roads, or material storage areas (e.g., OSHA Regulation 1910, Occupational Safety and Health). In other words, by ensuring the minimum size is 12 inches or more, workers can pass through the openings 60 and 70. Furthermore, the minimum size of the openings 60 and 70 can be 24 inches or more. By setting the opening width to twice 12 inches, smooth access is possible. In the case of a rectangular opening, the minimum size refers to the width. Furthermore, in the case of an elliptical opening, the minimum size refers to the size of the minor axis; in the case of a polygonal opening, it refers to the size of the part where the distance between opposite edges is shortest.

[0045] Here, as Figure 6 As shown, the particle beam therapy device 1 sometimes includes a cable carrier tube 80 (registered trademark, cable receptacle) for housing a cable 81 connected to an electromagnet. The cable carrier tube 80 is wound around a rotating shaft 30 and, when viewed axially from the centerline CL of the rotating shaft 30, extends from one side (the positive side in the Y-axis direction). The cable 81 is led out from a device 82 located on the positive side of the rotating shaft 30 in the Y-axis direction and guided to the rotating shaft 30 while being retracted by the cable carrier tube 80. One end of the cable carrier tube 80 is fixed by a fixing part 83 located below the device 82. Furthermore, the cable carrier tube 80, hanging between the fixing part 83 and the rotating shaft 30, is mounted on the rotating shaft 30 via a mounting part 84. The cable 81 enters the interior of the rotating shaft 30 from the mounting part 84 and connects to each electromagnet. When the rotating shaft 30 rotates, the mounting part 84 and the end of the cable carrier tube 80 rotate together. Thus, the cable carrier tube 80 is wound around the outer circumferential surface of the rotating shaft 30. At this time, the drooping portion of the cable carrier tube 80 between the fixing part 83 and the rotating shaft 30 becomes shorter (see reference). Figure 6 (dashed line).

[0046] The cable carrier tube 80 has a flat shape along its width and is wound in such a way that it occupies a predetermined area in the axial direction of the rotating shaft 30 (see reference). Figure 2 (The gray area). Therefore, a structure is adopted that prevents the opening 60 from being blocked by the cable carrier tube 80. Specifically, the cable carrier tube 80 is configured such that, when viewed axially from the center line CL of the rotation axis 30, it is led out only from one side (the positive side in the Y-axis direction) and not from the other side (the negative side in the Y-axis direction). Thus, it is configured to be easily approached from the side opposite to the lead-out side of the cable carrier tube 80 (the negative side in the Y-axis direction). And, asFigure 5 As shown, an opening portion 60A is formed on the housing 43 on the side opposite to the lead-out side of the cable carrier tube 80 when viewed in the axial direction. Also, in the present embodiment, an opening portion 60B is formed on the housing 43 on the lead-out side of the cable carrier tube 80 as well.

[0047] Next, the relationship between the rotation angle of the rotary shaft 30 and the winding manner of the cable carrier tube 80 will be described with reference to Figure 5 Figs. 17 to 20. Also, in order to facilitate the description, the state shown in Fig. 17 (a) will be taken as the state in which the rotation angle is 0°. In the state in which the rotation angle is 0°, the mounting position of the cable carrier tube 80 is disposed at the end portion on the positive side in the Y-axis direction, and overlaps with the opening portion 70B in a state in which the opening portion 60A is not blocked, and overlaps with the opening portion 70A in a state in which the opening portion 60B is not blocked. At this time, access is possible from the opening portions 60A, 70B and the opening portions 60B, 70A. As shown in Fig. 17 (b), when the rotation angle of the rotary shaft 30 becomes 90°, the opening portion 60D in a state in which it is blocked by the cable carrier tube 80 is disposed at the position of the opening portion 70B. At this time, the opening portion 60A overlaps with the opening portion 70A in a state in which the opening portion 60A is not blocked. At this time, access is possible from the opening portions 60A, 70A. As shown in Fig. 17 (c), when the rotation angle of the rotary shaft 30 becomes 180°, the opening portion 60B in a state in which it is blocked by the cable carrier tube 80 is disposed at the position of the opening portion 70A, and the opening portion 60D in a state in which it is blocked by the cable carrier tube 80 is disposed at the position of the opening portion 70B. At this time, the opening portion 60A overlaps with the opening portion 70B in a state in which the opening portion 60A is not blocked. At this time, access is possible from the opening portions 60A, 70B. As shown in Fig. 17 (d), when the rotation angle of the rotary shaft 30 becomes 270°, the opening portion 60B in a state in which it is blocked by the cable carrier tube 80 is disposed at the position of the opening portion 70B, and the opening portion 60C in a state in which it is blocked by the cable carrier tube 80 is disposed at the position of the opening portion 70A. At this time, the opening portion 60A overlaps with the opening portion 70A in a state in which the opening portion 60A is not blocked. At this time, access is possible from the opening portions 60A, 70A. As shown in Fig. 17 (e), when the rotation angle of the rotary shaft 30 becomes 360°, the opening portion 60A in a state in which it is blocked by the cable carrier tube 80 is disposed at the position of the opening portion 70B, and the opening portion 60B in a state in which it is blocked by the cable carrier tube 80 is disposed at the position of the opening portion 70A. Thus, in the case of (b) to (d), by rotating the rotary shaft 30, it becomes possible to access the inside of the rotary shaft 30. Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 Figure 5

[0048] Also, the rear portion (one end side) of the rotary shaft 30 is open so that a worker can access the inside of the rotary shaft 30 from the rear portion side (one end side). As described above, the inside space of the rotary shaft 30 becomes open to the outside in the rear portion of the rotary shaft 30 through the opening portion 40 (refer to Fig. 16) of the end portion of the rear side of the rotary shaft 30. Also, as shown in Fig. 17 (e), the opening portion 60A in a state in which it is blocked by the cable carrier tube 80 is disposed at the position of the opening portion 70B, and the opening portion 60B in a state in which it is blocked by the cable carrier tube 80 is disposed at the position of the opening portion 70A. Thus, in the case of (b) to (d), by rotating the rotary shaft 30, it becomes possible to access the inside of the rotary shaft 30. Figure 2 Figure 3 ​​​​​​​​As shown, a gap SP is provided between the opening portion 40 at the end of the rear side of the rotation shaft 30 and the wall portion 101 of the building at the rear side of the rotation frame 5. The gap SP is sized to ensure that a worker can pass therethrough. Thus, the worker can go around the end of the rear side of the rotation shaft 30 from the gap SP and approach the inside of the rotation shaft 30 from the opening portion 40. Also, a bearing 42 is provided at the rear side of the rotation shaft 30. That is, the rear side of the rotation shaft 30 is supported by the bearing 42 having a large space at the inner periphery side, rather than a support structure that blocks the opening portion 40 or hinders passage from the opening portion 40. Thus, the worker can approach the inside of the rotation shaft 30 from the inner periphery side of the bearing 42.

[0049] Next, the effects of the particle beam therapy apparatus 1 according to the present embodiment will be described.

[0050] The particle beam therapy apparatus 1 includes a hollow rotation shaft 30 in which the electromagnets 22, 24 that control the particle beam are disposed inside and which is rotatably provided by the power source 36. Since the rotation shaft 30 has a hollow structure, it has a space of a prescribed area inside. Thus, the electromagnets 22, 24 can be disposed in the inside space of the rotation shaft 30. Also, an opening portion 60 is formed in the rotation shaft 30. The particle beam therapy apparatus 1 enables a worker to approach the inside of the rotation shaft 30 via the opening portion 60. Thus, the worker can approach the inside of the rotation shaft 30 via the opening portion 60 and perform maintenance of the electromagnets 22, 24 in the space ensured inside the rotation shaft 30. Thus, the maintenance of the electromagnets 22, 24 inside the rotation shaft 30 can be improved.

[0051] Also, when the rotation shaft is of an assembled type, it is sometimes necessary to remove the rotation shaft at the time of maintenance. However, at this time, it is difficult to return to the state before the maintenance, and there is a possibility that an adverse situation such as a deviation of the particle beam will occur. In contrast, in the present embodiment, since the worker can perform the maintenance work in the rotation shaft 30, the above problems can be avoided.

[0052] The rotation shaft 30 can have a hard-shell structure. At this time, the inside space of the rotation shaft 30 can be ensured more greatly compared to a rotation shaft of a frame structure or the like. Also, it is easy to form the opening portion 60 with respect to the rotation shaft 30.

[0053] The support portion 31 has a housing 43 that accommodates the rotation shaft 30, and an opening portion 70 is formed in the housing 43, enabling a worker to approach the inside of the rotation shaft 30 via the opening portion 60 and the opening portion 70. At this time, even when the housing 43 is provided at the outside of the rotation shaft 30, the worker can easily approach the inside of the rotation shaft 30 through the opening portion 70.

[0054] The particle beam therapy apparatus 1 further includes a cable carrying pipe 80 that houses a cable 81 connected to the electromagnets 22, 24, the cable carrying pipe 80 being wound around the rotary shaft 30 and being able to be drawn out from one side in the axial direction from the center line CL of the rotary shaft 30. At this time, by setting the rotary shaft 30 to a specific rotation angle (for example, refer to Figure 5 (a) (c)), it is possible to approach the inside of the rotary shaft 30 while avoiding the cable carrying pipe 80.

[0055] The support portion 31 has a housing 43 that houses the rotary shaft 30, and an opening portion 70 can be formed on the housing 43 on the side opposite the drawing-out side of the cable carrying pipe 80 when viewed in the axial direction. At this time, it is possible to easily approach the inside of the rotary shaft 30 from the side opposite the drawing-out side of the cable carrying pipe 80 via the opening portion 70.

[0056] One end side of the rotary shaft 30 can be open so that a worker is able to approach the inside of the rotary shaft 30 from the one end side. At this time, the worker is also able to approach the inside from the rear side of the rotary shaft 30 and thereby perform maintenance of the electromagnets 22, 24.

[0057] A bearing 42 is provided on the one end side of the rotary shaft 30, and a worker is able to approach the inside of the rotary shaft 30 from the inner peripheral side of the bearing 42. By supporting the rotary shaft 30 with the bearing 42 that has a large space on the inner peripheral side, it is possible to suppress the opening from being blocked by the support structure of the one end side of the rotary shaft 30. Thus, the worker is able to approach the inside of the rotary shaft 30 from the inner peripheral side of the bearing 42 without obstruction.

[0058] The particle beam therapy apparatus 1 includes an irradiation portion 2 that irradiates a particle beam to an irradiated body, and a support frame 32 that supports the irradiation portion 2, and a counterweight 56 can be provided on the support frame 32 side. At this time, the counterweight 56 is disposed at a position that does not interfere with a worker approaching the inside of the rotary shaft 30, and thus the inside of the rotary shaft 30 is easily approachable.

[0059] The present application is not limited to the above-described embodiments.

[0060] The structure of the support portion 31 that supports the rotary shaft 30 is not limited to the above-described embodiments. For example, the structure shown in FIG. 17 can also be employed. Figure 7 Figure 7 ​The support portion 31 shown has roller members 90, 91, 92. The roller member 90 has a function of supporting the weight of the rotating shaft 30 while applying a rotational driving force to the rotating shaft 30. The roller member 90 is disposed below the front side of the rotating shaft 30. The roller member 91 has a function of supporting the weight of the rotating shaft 30. The roller member 91 is disposed below the rear side of the rotating shaft 30. The roller members 90, 91 are supported from below by a base portion 94 disposed on the base portion 100. The roller member 92 has a function of suppressing the floating of the rotating shaft 30. The roller member 92 is disposed above the rear side of the rotating shaft 30. The roller member 92 is supported from above by a pressing portion 96. At this time, since it is not necessary to dispose a structure with respect to the rotating shaft 30 Figure 3 The bearing shown, therefore, can correspondingly omit the housing. Therefore, since it is possible to suppress the disposition of a structure around the rotating shaft 30, it is easy to access the inside of the rotating shaft 30. In addition, even in the case of using the roller member 90, a structure in which the housing is disposed is not excluded.

[0061] The housing 43 can be a hard-shell structure or a frame structure. Also, the rotating shaft 30 need only be hollow, and need not necessarily be a hard-shell structure.

[0062] The structure of the rotating frame 5 can be appropriately changed within a range not departing from the gist of the present application.

Claims

1. A particle beam therapy device for irradiating a subject with a particle beam, the particle beam therapy device comprising: The hollow rotating shaft contains an electromagnet for controlling the particle beam and is rotatably set by a power source. The support portion rotatably supports the rotating shaft; and Cable housing, accommodating the cable connected to the electromagnet. A first opening is formed on the rotating shaft. The cable receptacle is wound around the rotating shaft and, when viewed axially from the centerline of the rotating shaft, is led out from one side. By setting the rotating shaft to a specific rotation angle, maintenance of the electromagnet can be performed by approaching the interior of the rotating shaft without bypassing the cable housing.

2. The particle beam therapy device according to claim 1, wherein, The rotating shaft has a rigid shell structure.

3. The particle beam therapy device according to claim 1, wherein, The support portion has a housing that accommodates the rotating shaft. A second opening is formed on the housing, allowing an operator to access the interior of the rotating shaft via the first and second openings.

4. The particle beam therapy device according to any one of claims 1 to 3, wherein, The support portion has a roller component that applies a rotational driving force to the rotating shaft.

5. The particle beam therapy device according to claim 1, wherein, The support portion has a housing that accommodates the rotating shaft. When viewed from the axial direction, a second opening is formed on the housing on the side opposite to the lead-out side of the cable receptacle.

6. The particle beam therapy device according to any one of claims 1 to 3, wherein, One end of the axis of rotation is open so that an operator can access the interior of the axis of rotation from that end.

7. The particle beam therapy device according to claim 6, wherein, A bearing is provided at one end of the rotating shaft, allowing an operator to approach the interior of the rotating shaft from the inner circumference of the bearing.

8. The particle beam therapy device according to any one of claims 1 to 3, comprising: The irradiation unit irradiates the irradiated object with the particle beam; and Support frame, supporting the irradiation unit. A counterweight is provided on the side of the support frame.

9. The particle beam therapy device according to claim 1, wherein, The first opening is sized to allow workers to pass through it.

10. The particle beam therapy device according to claim 1, wherein, The particle beam therapy device also includes an irradiation unit that irradiates the irradiated body with the particle beam controlled by the electromagnet. A first opening is formed on the side of the rotating shaft, or a third opening is formed at the end furthest from the irradiation portion along the rotating shaft. The operator can access the hollow part of the rotating shaft through the first opening or the third opening.

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