Rotary rack of helium ion treatment device

Abstract

The utility model relates to a rotating rack of a helium ion treatment device, which comprises a first rolling ring, a second rolling ring, a connecting assembly, a first supporting mechanism and a second supporting mechanism, and is characterized in that the first rolling ring is supported by the first supporting mechanism and can rotate relative to the first supporting mechanism; the second rolling ring is supported by the second supporting mechanism and can rotate relative to the second supporting mechanism; the first rolling ring and the second rolling ring are fixedly connected through the connecting assembly, a driving mechanism is arranged on the first supporting mechanism, and the driving mechanism is connected with the first rolling ring and used for driving the first rolling ring and the second rolling ring to rotate; the first rolling ring is provided with a treatment head, the connecting assembly is provided with a beam transmission assembly, and the beam transmission assembly is connected with the treatment head. The rotating rack of the helium ion treatment device is simple in structure, small in size, light in weight and low in manufacturing cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to radiotherapy equipment technical field more particularly to a kind of rotating gantry of helium ion therapy device. BACKGROUND

[0002] Due to the heavy ion such as helium ion, carbon ion, dose peak (i.e. bragg peak) is more sharp compared with proton therapy in cancer treatment field, can destroy the DNA double chain of molecule, with faster and more sharp performance, so treatment effect is better.

[0003] But the particle mass of heavy ion is big, energy is high, resulting in the volume of existing heavy ion therapy device (especially its rotating gantry), weight is big, cost is high.Therefore, how to reduce the volume and weight of rotating gantry of heavy ion therapy device is the technical problem that the person skilled in the art needs to solve urgently. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of rotating gantry of helium ion therapy device to reduce the volume and weight of rotating gantry, reduce its cost.

[0005] Based on the above purpose, the utility model provides a kind of rotating gantry of helium ion therapy device, comprising: including first rolling ring, second rolling ring, connecting assembly, first support mechanism and second support mechanism, the first rolling ring is supported by the first support mechanism and can rotate relative to the first support mechanism, the second rolling ring is supported by the second support mechanism and can rotate relative to the second support mechanism;The first rolling ring and the second rolling ring are fixedly connected by the connecting assembly, driving mechanism is equipped on the first support mechanism, the driving mechanism is connected with the first rolling ring, for driving the first rolling ring and the second rolling ring rotate;Treatment head is equipped on the first rolling ring, beam transmission assembly is equipped on the connecting assembly, the beam transmission assembly is connected with the treatment head.

[0006] Further, the connecting assembly includes first connecting support and two second connecting supports, one end of two second connecting supports is respectively fixedly connected with the first rolling ring, the other end of two second connecting supports is respectively fixedly connected with one end of the first connecting support, the other end of the first connecting support is fixedly connected with the second rolling ring.

[0007] Further, the connecting assembly further includes connecting plate, the connecting plate is across between the first rolling ring and the second rolling ring, and is respectively fixedly connected with the first connecting support, the first rolling ring and the second rolling ring.

[0008] Furthermore, the beam transmission component is disposed on the first connecting bracket and one of the second connecting brackets, and the treatment head is fixed on the second connecting bracket on which the beam transmission component is disposed; the other second connecting bracket is provided with a counterweight for balancing the weight of the beam transmission component and the treatment head.

[0009] Furthermore, the beam transmission assembly includes a vacuum tube and a plurality of beam elements arranged in sequence. The vacuum tube passes through each beam element in sequence. One end of the vacuum tube is connected to the accelerator and the other end is connected to the treatment head. Each beam element includes a plurality of quadrupole iron and a plurality of superconducting diode iron.

[0010] Furthermore, the first support mechanism includes a first base and two first roller support assemblies, the two first roller support assemblies are fixed on the first base and are arranged opposite to each other, and the first rolling ring is supported by the two first roller support assemblies.

[0011] Furthermore, each of the first roller support assemblies includes a first support frame, a second support frame, and a first support. The first support frame is rotatably connected to the first support. One end of the first support frame is provided with a rotatable first roller. The other end of the first support frame is rotatably connected to the second support frame. Each end of the second support frame is provided with a rotatable first roller.

[0012] Furthermore, the first roller is fixed on a roller shaft, which is rotatably mounted on the first support frame or the second support frame; the rotating frame also includes a braking device, which is fixed on the first support frame or the second support frame, and the braking device is used to grip the roller shaft after being triggered so that the roller shaft cannot rotate relative to the first support frame or the second support frame.

[0013] Furthermore, two first axial guide wheels are fixed on the first base, and the first rolling ring is disposed between the two first axial guide wheels. The two first axial guide wheels are used to restrict the axial movement of the first rolling ring.

[0014] Furthermore, the second support mechanism includes a second base and two slides, the two slides being disposed opposite to each other on the second base, the slides being slidably connected to the second base and being slidable relative to the second base along the axial direction; each slide is fixed with a second roller support assembly, the second rolling ring being supported by the two second roller support assemblies and being rotatable relative to the two second roller support assemblies.

[0015] Furthermore, the second roller support assembly includes a second support and a third support frame. The second support is fixed on the slide table, and the third support frame is rotatably connected to the second support. Each end of the third support frame is provided with a second roller, and the second roller can rotate relative to the third support frame. The second rolling ring is supported by each of the second rollers.

[0016] Furthermore, the third support frame is provided with two second axial guide wheels, and the second rolling ring is disposed between the two second axial guide wheels, so as to restrict the axial movement of the second rolling ring by means of the two second axial guide wheels.

[0017] The rotating frame of the helium ion therapy device of this invention has a simple structure, small size, light weight, and low manufacturing cost; its size is comparable to that of the proton therapy device, but its treatment effect is better than that of the proton therapy device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the rotating frame of the helium ion therapy device according to an embodiment of the present invention from one perspective;

[0019] Figure 2 This is a structural schematic diagram of the rotating frame of the helium ion therapy device according to an embodiment of the present invention from another perspective;

[0020] Figure 3 This is a schematic diagram of the structure of the helium ion therapy device according to an embodiment of the present invention after the connecting plate has been removed;

[0021] Figure 4 This is a schematic diagram of the structure of the first roller support assembly of the helium ion therapy device according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the drive mechanism of the helium ion therapy device according to an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram showing the connection relationship between the first roller and the braking device of the helium ion therapy device according to an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the structure of the first axial support wheel of the helium ion therapy device according to an embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of the second support mechanism of the helium ion therapy device according to an embodiment of the present invention. Detailed Implementation

[0026] The preferred embodiments of this utility model are given below with reference to the accompanying drawings and described in detail.

[0027] like Figure 1 and Figure 2 As shown, this embodiment of the present invention provides a rotating frame for a helium ion therapy device, which includes a first rolling ring 100, a second rolling ring 200, a connecting assembly 300, a first support mechanism 400, and a second support mechanism 500. The first rolling ring 100 is disposed on the first support mechanism 400, supported by the first support mechanism 400, and rotatable relative to the first support mechanism 400; the second rolling ring 200 is disposed on the second support mechanism 500, supported by the second support mechanism 500, and rotatable relative to the second support mechanism 500; the first rolling ring 100 and the second rolling ring 200 are coaxially arranged and fixedly connected by the connecting assembly 300; the first support mechanism 400 is provided with a driving mechanism 700. The first roller 100 is connected to the second roller 200 and is used to drive the first roller 100 to rotate. Since the second roller 200 is fixedly connected to the first roller 100, the second roller 200 will also rotate with the first roller 100. The treatment head 110 is fixed on the first roller 100. The beam transmission component 600 is provided on the connecting component 300. The beam transmission component 600 is connected to the treatment head 110 and is used to transmit the accelerated helium ion particle stream to the treatment head 110. The treatment head 110 is used to accurately aim the particle stream at the tumor tissue for radiotherapy. The beam transmission component 600 and the treatment head 110 can rotate 360 ​​degrees with the first roller 100, so that the particle stream can irradiate the patient's tumor tissue at any angle.

[0028] like Figure 3 As shown, in some embodiments, the connecting assembly 300 may include a first connecting bracket 310 and two second connecting brackets 320. One end of each of the two second connecting brackets 320 is fixedly connected to the first rolling ring 100, and the other end of each of the two second connecting brackets 320 is fixedly connected to one end of the first connecting bracket 310. The other end of the first connecting bracket 310 is fixedly connected to the second rolling ring 200, thereby fixing the first rolling ring 100 and the second rolling ring 200 together. The connecting ends of the two second connecting brackets 320 and the first rolling ring 100 may be arranged radially opposite each other, while the first connecting bracket 310 is arranged axially, so that the center of gravity of the whole assembly of the first rolling ring 100, the connecting assembly 300, and the second rolling ring 200 is near the rotation center of the first rolling ring 100 and the second rolling ring 200.

[0029] In some embodiments, the connecting assembly 300 may further include a connecting plate 330, which spans between the first rolling ring 100 and the second rolling ring 200 and is fixedly connected to the first connecting bracket 310, the first rolling ring 100 and the second rolling ring 200 respectively. The connecting plate 330 can be used as a work platform for maintaining the rotating frame. A staircase may also be provided on the connecting plate 330 for workers to climb in order to maintain the parts on the first rolling ring 100 and the second rolling ring 200. A guardrail may also be provided on the connecting plate 330 to prevent workers from falling.

[0030] In some embodiments, the beam transmission component 600 may be disposed on the first connecting bracket 310 and one of the second connecting brackets 320, and the treatment head 110 is also fixed on the second connecting bracket 320. The other second connecting bracket 320 is provided with a counterweight 340, which is used to balance the weight of the beam transmission component 600 and the treatment head 110, so that the center of gravity of the overall structure formed by the first rolling ring 100, the second rolling ring 200, the connecting component 300, the beam transmission component 600, etc. is located near the center of rotation.

[0031] In some embodiments, the beam transmission assembly 600 may include a vacuum conduit 610 and a plurality of beam elements arranged sequentially. The vacuum conduit 610 passes through each beam element sequentially. One end of the vacuum conduit 610 is connected to an accelerator, and the other end is connected to a treatment head 110, thereby transmitting the particle beam accelerated by the accelerator to the treatment head 110 through the vacuum conduit 610. Each beam element may include several quadrupole iron 620s and three superconducting dipole iron 630s. The superconducting dipole iron 630s differ from conventional iron in that they have a higher magnetic field strength and can complete the bending of the particle beam within a smaller bending radius, thereby reducing the overall size of the gantry.

[0032] In some embodiments, the first support mechanism 400 may include a first base 410 and two first roller support assemblies 420. The two first roller support assemblies 420 are fixed to the first base 410 and arranged radially opposite to each other. The first rolling ring 100 is supported by the two first roller support assemblies 420 and can rotate relative to the two first roller support assemblies 420. Figure 4As shown, each first roller support assembly 420 includes a first support frame 421, a second support frame 422, and a first support 423. The first support frame 421 is rotatably connected to the first support 423. A first roller 424 is provided on one end of the first support frame 421, and the other end of the first support frame 421 is rotatably connected to the second support frame 422. A first roller 424 is provided on each end of the second support frame 422. The first roller 424 can rotate on the first support frame 421 and the second support frame 422. A first rolling ring 100 is supported on each of the first rollers 424. When the first rolling ring 100 rotates, the first rolling ring 100 will drive the first roller 424 to rotate. There is rolling friction between the first rolling ring 100 and the first roller 424. Since the first support frame 421 can rotate relative to the first support 423, and the second support frame 422 can rotate relative to the first support frame 421, and the rotational connection point between the first support frame 421 and the first support 423 is between the two ends of the first support frame 421, and the rotational connection point between the second support frame 422 and the first support frame 421 is between the two ends of the second support frame 422, the roller support assembly 42 can be formed into a "seesaw" structure. When the first roller ring 100 is placed on each of the first rollers 424, the first support frame 421 and the second support frame 422 will rotate adaptively under the gravity of the first roller ring 100, so that each of the first rollers 424 can always maintain close contact with the first roller ring 100.

[0033] like Figure 5 As shown, in some embodiments, the drive mechanism 700 includes a motor 710 and a first sprocket 720, the motor 710 being connected to the first sprocket 720, and a second sprocket 120 (e.g., on the first rolling ring 100) being provided on the first rolling ring 100. Figure 1 As shown, the second sprocket 120 can be coaxially arranged with the first rolling ring 100. A ring chain 730 is sleeved on the first sprocket 720 and the second sprocket 730 and meshes with the first sprocket 720 and the second sprocket 730 so that the first sprocket 720 and the second sprocket 730 are connected by the chain 730. When the motor 710 rotates, it can drive the first sprocket 720 to rotate. The rotation of the first sprocket 720 causes the chain 730 to rotate, and the chain 730 causes the second sprocket 730 to rotate, thereby causing the first rolling ring 100 to rotate.

[0034] In some embodiments, the drive mechanism 700 may further include a reducer 740, with the motor 710 connected to the reducer 740 and the reducer 740 connected to the first sprocket 720, so as to reduce the speed of the motor 710 through the reducer 740. The reducer 740 may be fixed on the mounting bracket 750, which is fixed on the first base 410.

[0035] like Figure 6As shown, the first roller 424 is fixed to the roller shaft 425, which is rotatably mounted on the first support frame 421 or the second support frame 422, so that the first roller 424 can rotate relative to the first support frame 421 or the second support frame 422. The rotating frame also includes a braking device 426, which is fixed to the first support frame 421 or the second support frame 422, for gripping the roller shaft 425 after being triggered, so that the roller shaft 425 cannot rotate. In this way, the first roller 424 also cannot rotate, and the friction between the first rolling ring 100 and the first roller 424 will change from rolling friction to sliding friction, so that the first rolling ring 100 stops rotating within the required rotation angle. The advantages of this design are as follows: The rotating part of the rotating frame weighs tens of tons and has a large moment of inertia under high-speed motion. Directly braking it would place excessive demands on the brake, and if braking is too rapid without buffering, the over-impact force on the beam transmission component 600 would be enormous, impacting the beam element 620 and its supporting structure, and potentially causing the beam element 620 to fly off the rotating frame, resulting in significant equipment damage. Therefore, braking the first roller 424 transforms rolling friction into sliding friction, ensuring that the maximum resistance torque of the first rolling ring 100 is constant, i.e., the product of the static friction coefficient and its mass. This protects critical equipment, allows the structure to stop quickly within regulatory requirements, and avoids excessive impact and wear on the brake.

[0036] like Figure 7 As shown, in some embodiments, two first axial rollers 430 may also be fixed on the first base 410. The bottom of the first rolling ring 100 is located between the two first axial rollers 430 and abuts against them. The first rolling ring 100 and the two first axial rollers 430 can rotate relative to each other, thereby restricting the axial movement of the first rolling ring 100 by the two first axial rollers 430, but not restricting the rotation of the first rolling ring 100.

[0037] like Figure 8As shown, in some embodiments, the second support mechanism 500 includes a second base 510 and two slides 520. The two slides 520 are radially opposite to each other on the second base 510. The slides 520 are slidably connected to the second base 510 and can slide axially relative to the second base 510. Each slide 520 is fixed with a second roller support assembly 530. The second rolling ring 200 is supported by the two second roller support assemblies 530 and can rotate relative to the two second roller support assemblies 530. Due to thermal expansion and contraction caused by temperature changes, the axial length of the entire structure consisting of the first rolling ring 100, the connecting assembly 300, and the second rolling ring 200 may change, resulting in axial expansion and contraction. If both the first rolling ring 100 and the second rolling ring 200 are fixed to their respective support mechanisms, the entire structure will experience significant structural deformation and internal stress due to its inability to move axially. The slide table 520 can solve this problem. When the entire structure expands and contracts axially due to temperature changes, the second rolling ring 200 allows the slide table 520 to move axially to accommodate the expansion and contraction of the entire structure without generating internal stress.

[0038] In some embodiments, one of the slide table 520 and the second base 510 is provided with a slide rail, and the other is provided with a slider, which is slidably disposed in the slide rail so that the slide table 520 and the second base 510 are slidably connected.

[0039] In some embodiments, the second roller support assembly 530 includes a second support 531 and a third support frame 532. The second support 531 is fixed on the slide table 520, and the third support frame 532 is rotatably connected to the second support 531. Each end of the third support frame 532 is provided with a second roller 533, which can rotate on the third support frame 532. A second rolling ring 200 is supported on each of the second rollers 533. When the second rolling ring 200 rotates, it will drive the second rollers 533 to rotate. There is rolling friction between the second rolling ring 200 and the second rollers 533. The rotational connection point between the third support frame 532 and the second support 531 is located between the two ends of the third support frame 532. Thus, the second roller support assembly 530 will form a "seesaw" structure. When the second roller ring 200 is placed on each of the second rollers 533, the third support frame 532 will rotate adaptively under the gravity of the second roller ring 200, so that each of the second rollers 533 can always maintain close contact with the second roller ring 200.

[0040] In some embodiments, the third support frame 532 may be provided with two second axial guide rollers, and the bottom of the second rolling ring 200 is disposed between the two second axial guide rollers, so as to restrict the axial movement of the second rolling ring 200 by means of the second axial guide rollers. In this way, the third support frame 530 can restrict the axial degree of freedom of the second rolling ring 200, but not its circumferential degree of freedom. When thermal expansion and contraction occur due to temperature changes, the second rolling ring 200 can move axially together with the third support frame 532 and the slide table 520 to adapt to temperature changes and prevent structural deformation and the generation of internal stress.

[0041] The surfaces of the first roller 424 and the second roller 533 can be large-radius arc surfaces, and their contact with the first roller ring 100 and the second roller ring 200 is surface contact to reduce pressure; even if the first roller ring 100 and the second roller ring 200 deform during rotation, the design of the large arc surface can ensure that the first roller ring 100 and the second roller ring 200 maintain face-to-face contact with the first roller 424 and the second roller 533 respectively.

[0042] In some embodiments, a magnetic scale and a ruler may also be installed on the first rolling ring 100 to form two angle measurement systems in addition to the motor encoder, in order to correct the zero point error of the rotating frame.

[0043] In some embodiments, the first roller 100 may also be provided with a rotating floor (not shown in the figure), which is fixedly connected to the treatment head 110. The rotating floor is used to cover the gap, which can prevent people from falling into the gap and also has an aesthetic effect.

[0044] The rotating frame of the helium ion therapy device of this utility model embodiment has a simple structure, small size, light weight, and low manufacturing cost; its size is comparable to that of the proton therapy device, but its treatment effect is better than that of the proton therapy device.

[0045] It should be noted that the present invention (e.g., a utility model concept, etc.) has been described in the specification and / or illustrated in the figures of this patent document according to exemplary embodiments; the embodiments of the present invention are presented by way of example only and are not intended to limit the scope of the present invention. The structure and / or arrangement of the elements of the utility model concept embodied in the present invention as described in the specification and / or illustrated in the figures are merely illustrative. Although exemplary embodiments of the present invention have been described in detail in this patent document, it will be readily understood by those skilled in the art that equivalents, modifications, variations, etc., of the subject matter of the exemplary and alternative embodiments are possible and are considered to be within the scope of the present invention; all such subject matter (e.g., modifications, variations, embodiments, combinations, equivalents, etc.) are intended to be included within the scope of the present invention. It should also be noted that various modifications, variations, substitutions, equivalents, alterations, omissions, etc., may be made in the configuration and / or arrangement of the exemplary embodiments (e.g., in terms of concept, design, structure, device, form, assembly, construction, means, function, system, process / method, steps, sequence of process / method steps, operation, operating conditions, performance, materials, composition, combination, etc.) without departing from the scope of this utility model; all such subject matter (e.g., modifications, variations, embodiments, combinations, equivalents, etc.) is intended to be included within the scope of this utility model. The scope of this utility model is not intended to be limited to the subject matter (e.g., details, structure, function, materials, behavior, steps, sequence, system, result, etc.) described in the specification and / or figures of this patent document. Considering that the claims of this patent document will be properly interpreted to cover the full scope of the subject matter of this utility model (e.g., including any and all such modifications, variations, embodiments, combinations, equivalents, etc.); it should be understood that the terminology used in this patent document is for the purpose of providing a description of the subject matter of exemplary embodiments and not as a limitation on the scope of this utility model.

[0046] It should also be noted that, according to exemplary embodiments, the present invention may include conventional techniques (e.g., techniques implemented and / or integrated in exemplary embodiments, modifications, variations, combinations, equivalents, etc.), or may include any other applicable techniques (now and / or in the future) with the ability to perform the functions and processes / operations described in the specification and / or illustrated in the figures. All such techniques (e.g., techniques implemented in the manner of embodiments, modifications, variations, combinations, equivalents, etc.) are considered to be within the scope of the present invention in this patent document.

Claims

1. A rotating frame for a helium ion therapy device, characterized in that, The device includes a first roller, a second roller, a connecting assembly, a first support mechanism, and a second support mechanism. The first roller is supported by the first support mechanism and can rotate relative to it. The second roller is supported by the second support mechanism and can rotate relative to it. The first roller and the second roller are fixedly connected by the connecting assembly. The first support mechanism is provided with a driving mechanism connected to the first roller and used to drive the first roller and the second roller to rotate. A treatment head is provided on the first roller, and a beam transmission assembly is provided on the connecting assembly and connected to the treatment head.

2. The rotating frame of the helium ion therapy device according to claim 1, characterized in that, The connecting assembly includes a first connecting bracket and two second connecting brackets. One end of each of the two second connecting brackets is fixedly connected to the first rolling ring, and the other end of each of the two second connecting brackets is fixedly connected to one end of the first connecting bracket. The other end of the first connecting bracket is fixedly connected to the second rolling ring.

3. The rotating frame of the helium ion therapy device according to claim 2, characterized in that, The connecting assembly further includes a connecting plate that spans between the first rolling ring and the second rolling ring and is fixedly connected to the first connecting bracket, the first rolling ring, and the second rolling ring, respectively.

4. The rotating frame of the helium ion therapy device according to claim 2, characterized in that, The beam transmission component is disposed on the first connecting bracket and one of the second connecting brackets, and the treatment head is fixed on the second connecting bracket on which the beam transmission component is disposed; the other second connecting bracket is provided with a counterweight for balancing the weight of the beam transmission component and the treatment head.

5. The rotating frame of the helium ion therapy device according to claim 1, characterized in that, The beam transmission assembly includes a vacuum tube and a plurality of beam elements arranged in sequence. The vacuum tube passes through each beam element in sequence. One end of the vacuum tube is connected to the accelerator and the other end is connected to the treatment head. Each beam element includes a plurality of quadrupole iron and a plurality of superconducting diode iron.

6. The rotating frame of the helium ion therapy device according to claim 1, characterized in that, The first support mechanism includes a first base and two first roller support assemblies. The two first roller support assemblies are fixed on the first base and arranged opposite to each other. The first rolling ring is supported by the two first roller support assemblies.

7. The rotating frame of the helium ion therapy device according to claim 6, characterized in that, Each of the first roller support assemblies includes a first support frame, a second support frame, and a first support. The first support frame is rotatably connected to the first support. One end of the first support frame is provided with a rotatable first roller. The other end of the first support frame is rotatably connected to the second support frame. Each end of the second support frame is provided with a rotatable first roller.

8. The rotating frame of the helium ion therapy device according to claim 7, characterized in that, The first roller is fixed on a roller shaft, which is rotatably mounted on the first support frame or the second support frame; the rotating frame also includes a braking device, which is fixed on the first support frame or the second support frame, and the braking device is used to hold the roller shaft after being triggered so that the roller shaft cannot rotate relative to the first support frame or the second support frame.

9. The rotating frame of the helium ion therapy device according to claim 6, characterized in that, Two first axial guide wheels are fixed on the first base, and the first rolling ring is disposed between the two first axial guide wheels. The two first axial guide wheels are used to restrict the axial movement of the first rolling ring.

10. The rotating frame of the helium ion therapy device according to claim 1, characterized in that, The second support mechanism includes a second base and two slides. The two slides are disposed opposite to each other on the second base. The slides are slidably connected to the second base and can slide axially relative to the second base. Each slide is fixed with a second roller support assembly. The second rolling ring is supported by the two second roller support assemblies and can rotate relative to the two second roller support assemblies.

11. The rotating frame of the helium ion therapy device according to claim 10, characterized in that, The second roller support assembly includes a second support and a third support frame. The second support is fixed on the slide table, and the third support frame is rotatably connected to the second support. Each end of the third support frame is provided with a second roller, and the second roller can rotate relative to the third support frame. The second rolling ring is supported by each of the second rollers.

12. The rotating frame of the helium ion therapy device according to claim 11, characterized in that, The third support frame is provided with two second axial guide wheels, and the second rolling ring is disposed between the two second axial guide wheels to restrict the axial movement of the second rolling ring.

Images