Particle therapy device

Abstract

The present application relates to the technical field of particle therapy, and particularly provides a particle therapy instrument, which comprises a body (provided with a particle accelerator), a treatment head arranged on the body, and a transmission pipeline connected between the particle accelerator and the treatment head for transmitting a particle beam. The transmission pipeline is provided with a deflection part for changing the direction of the particle beam at each bending position, wherein the deflection part at the bending position with the largest bending angle is a first deflection part, and the first deflection part is composed of at least two deflection magnets. By distributing the large turning amount to multiple magnets with smaller deflection angles, the bending angle requirement of a single magnet can be significantly reduced, the weight and volume of the magnet can be reduced, the design of the magnet yoke and coil can be simplified, and thus the manufacturing difficulty and cost can be reduced. Meanwhile, the segmented transportation, on-site hoisting and positioning are facilitated, the demand for large lifting equipment and the installation and debugging time are reduced, and the transportation, installation and debugging cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of particle therapy technology, and more particularly to a particle therapy device. Background Technology

[0002] The rotating gantry of particle therapy devices is often large and heavy, and has high requirements for magnetic field and structural design, resulting in high equipment manufacturing and maintenance costs, and requiring large radiation protection rooms and supporting infrastructure.

[0003] In particular, particle therapy devices that use large-angle deflection magnets are usually larger in size and cost, and their magnet weight, energy consumption and cooling requirements significantly increase the complexity of the whole machine. Summary of the Invention

[0004] This invention provides a particle therapy device to improve and reduce costs.

[0005] To solve the above-mentioned technical problems, the present invention provides a particle therapy device, comprising: The organism, including particle accelerators; The treatment head is disposed on the body; A transmission conduit connects a particle accelerator and a treatment head to transmit a particle beam from the particle accelerator to the treatment head; The transmission pipeline includes a deflection section, and a deflection section is provided at each bend of the transmission pipeline. The deflection section is used to change the direction of the particle beam. The deflection part at the bend position with the largest bend angle of the transmission pipe is the first deflection part, and the first deflection part includes at least two deflection magnets.

[0006] In one embodiment of the present invention, the deflection portion near the first bending position of the treatment head is a first deflection portion, and the deflection angle of the first deflection portion is 90°~180°.

[0007] In one embodiment of the present invention, the deflection portion near the second bending position of the treatment head is the second deflection portion, the deflection angle of the second deflection portion is 50°~70°, the deflection angle of the first deflection portion is 140°~160°, and the deflection directions of the first deflection portion and the second deflection portion are opposite.

[0008] In one embodiment of the present invention, the first deflection part includes a first deflection magnet and a second deflection magnet, and the deflection angles of the first deflection magnet and the second deflection magnet are both less than 90°.

[0009] In one embodiment of the present invention, the first deflection part includes a first deflection magnet and a second deflection magnet, wherein the first deflection magnet and the second deflection magnet have the same deflection angle.

[0010] In one embodiment of the present invention, the deflection angle of the first deflecting magnet and the second deflecting magnet is 70°~80°.

[0011] In one embodiment of the present invention, the deflection portion near the third bend position of the treatment head is the third deflection portion, and the deflection angle of the third deflection portion is 25°~35°.

[0012] In one embodiment of the present invention, the deflection portion near the fourth bend of the treatment head is the fourth deflection portion, and the deflection angle of the fourth deflection portion is 25°~35°.

[0013] In one embodiment of the present invention, a plurality of focusing units are provided between the first deflection part and the second deflection part, and a plurality of focusing units are provided between the third deflection part and the fourth deflection part.

[0014] In one embodiment of the present invention, an energy degrader is provided between the particle accelerator and the fourth deflection section.

[0015] In one embodiment of the present invention, a plurality of sets of lead-out magnets are provided between the particle accelerator and the de-energizer, and a plurality of sets of focusing units are provided between the de-energizer and the fourth deflection section.

[0016] The beneficial effects of the present invention are as follows: The present invention uses a first deflection part composed of at least two deflecting magnets. Compared with a single large-angle bending magnet, the bending angle required for each magnet is reduced, thereby reducing the weight and volume of a single magnet and simplifying the design of the yoke and coil, reducing manufacturing difficulty and cost. The miniaturization facilitates segmented transportation, on-site hoisting and positioning, reduces the need for large lifting equipment and installation and commissioning time, and thus reduces transportation, installation and commissioning costs. Attached Figure Description The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram: Figure 1 This is a three-dimensional structural schematic diagram of a particle therapy device provided in an embodiment of the present invention; Figure 2 This is a simplified structural diagram of a particle therapy device provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the beam transmission device of a particle therapy device according to an embodiment of the present invention; Figure 4 This is a particle beam envelope detection diagram of a particle therapy device provided in an embodiment of the present invention; Figure 5 The distribution diagram of the beam spot at the isocenter of the particle therapy device provided in an embodiment of the present invention in phase space and real space is shown.

[0018] The reference numerals in the attached figures are as follows: 10, particle accelerator; 20, rotating gantry; 30, treatment head; 50, transmission channel; 51, first deflection section; 511, first deflection magnet; 512, second deflection magnet; 52, second deflection section; 53, third deflection section; 54, fourth deflection section; 60, focusing unit; 70, energy degrader; 80, extraction magnet. Detailed Implementation

[0019] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0022] When charged particles (such as protons) pass through matter, they interact electromagnetically with atomic electrons. Energy loss gradually accumulates with depth, resulting in a sharp energy release peak (Bragg peak) near the end of the beam's range. Utilizing the energy deposition characteristics of the Bragg peak, particle beams can concentrate the majority of the dose at the tumor site while retaining a smaller dose in normal tissues before and after the tumor. This achieves higher dose delivery selectivity and better organ protection in radiotherapy. This physical basis gives particle therapy significant clinical advantages over photon radiotherapy in the treatment of certain tumors.

[0023] A typical particle therapy system consists of several subsystems: an accelerator subsystem (commonly a cyclotron or synchrotron) generates and initially accelerates the particle beam; an energy selection system precisely adjusts the particle beam energy to control the energy deposition depth; a beam delivery system safely and stably delivers the beam from the accelerator to the treatment chamber; and a gantry and treatment head within the treatment chamber precisely introduce the beam into the body according to the treatment plan and perform dose delivery and scanning. To achieve sub-millimeter-level dose localization accuracy, the system also needs to possess sophisticated beam modulation, beam spot control, pose positioning, and image localization coordination capabilities.

[0024] Current clinical rotating gantry designs aim to optimize dose distribution by providing beam entry at any angle around the patient. A common beamline arrangement involves introducing the beam from the accelerator into the rotating gantry within the treatment room via a small-angle deflector magnet. The beam is then focused using multiple sets of quadrupole magnets. Subsequently, a large-angle deflector magnet (greater than 180 degrees) redirects the beam towards the treatment direction, and finally, the dose is delivered through the treatment head (containing scanning coils or energy modulation devices). This structure must meet the requirements for beam spot size and position control while ensuring beam stability and treatment repeatability during mechanical rotation.

[0025] However, rotating frames that achieve the above functions are often large in size and weight, and have high requirements for magnetic field and structural design, resulting in high equipment manufacturing and maintenance costs, and requiring large radiation protection rooms and supporting infrastructure. In particular, the bent magnets (large-angle deflection magnets) used for large-angle deflection usually account for a large proportion of size and cost, and their magnet weight, energy consumption and cooling requirements significantly increase the complexity of the whole machine.

[0026] Therefore, how to reduce the reliance of the rotating gantry on large-angle deflection magnets, reduce the size and weight of the gantry, and lower construction and maintenance costs while ensuring dose delivery accuracy has become an important engineering and technical challenge in the design of current particle therapy equipment.

[0027] like Figure 1-3 As shown, this invention provides a particle therapy device, wherein the particles can be protons, neutrons, heavy ions, and electron beams, etc. Figure 1-5 As shown, it includes a body, a treatment head 30, a transmission channel 50, and a deflection section.

[0028] like Figure 1 , Figure 2As shown, the device includes a particle accelerator 10 and a rotating frame 20. A treatment head 30 is disposed on the device. The treatment head 30 is typically located on the upper part of the rotating frame 20, and the emission direction of the treatment head 30 is perpendicular to the axis of the rotating frame 20. A transmission conduit 50 connects the particle accelerator 10 and the treatment head 30 to transmit the particle beam from the particle accelerator 10 to the treatment head 30. A deflection section is provided at each bend of the transmission conduit 50 to change the direction of the particle beam. The deflection section at the bend with the largest bend angle in the transmission conduit 50 is the first deflection section 51, which includes at least two deflection magnets.

[0029] By breaking down a large bend into multiple smaller bends, and using multiple deflecting magnets in concert to achieve the total deflection angle, the beam steering requirements are met, while also facilitating reliable beam transmission between the rotating gantry 20 and the treatment head 30. Replacing the single large-angle bending magnet at the maximum bend with at least two small deflecting magnets significantly reduces the weight and volume of individual magnets, lowers manufacturing complexity and material costs, and facilitates segmented transportation and on-site installation and commissioning, thereby reducing transportation, installation, and commissioning costs. The reduced overall magnet volume and gantry load simplify the civil engineering and shielding design of the equipment room, reducing investment in protection and supporting facilities. Distributed operating points help reduce energy consumption and heat dissipation load, allowing for a smaller cooling system.

[0030] In one embodiment of the present invention, as Figure 3 As shown, the first bend near the treatment head 30 is the maximum bend position of the transmission channel 50. The deflection angle of the first deflection section 51 is set to 90°~180°, meaning that the particle beam is typically drawn out from below and then deflected to a vertically downward emission direction. This first deflection section 51 uses at least two deflection magnets to achieve the total deflection angle. By decomposing the large bend angle into multiple smaller bend angles, the required direction conversion and beam matching can be achieved, and reliable beam transmission and angle adaptation between the rotating gantry 20 and the treatment head 30 can be easily realized. The deflection angle refers to the angle between the particle beam inflow direction and the outflow direction.

[0031] In one embodiment of the present invention, as Figure 3As shown, the transmission conduit 50 has two bends near the treatment head 30. The second deflection part 52 is located at the second bend position near the treatment head 30, away from the first deflection part 51. Its deflection angle is 50°~70°, preferably 55°~65°, more preferably 60°. The deflection magnet can also be selected from any one or any two angles within the range of 50°, 55°, 60°, 65°, 70°, etc. The first deflection part 51 is located at the maximum bend, and its deflection angle is 140°~160°, preferably 145°~155°, more preferably 150°. It can also be selected from any one or any two angles within the range of 140°, 145°, 150°, 155°, 160°, etc. The deflection directions of the two bends are opposite, that is, the curvature centers of the two bends are located on opposite sides (for example, in...). Figure 3 The second deflection part 52 deflects upward, and the first deflection part 51 deflects downward. Figure 3 The example illustrates how the final beam direction conversion is achieved by decomposing the total deflection angle into a downward deflection of approximately 150° and an upward deflection of approximately 60°. This arrangement optimizes the magnet arrangement and rack geometry while meeting beam steering and dose delivery accuracy requirements. By adopting this larger segmented deflection angle arrangement, compared to existing designs with smaller deflection angles but larger spans, the axial and radial space occupied by the rotating rack 20 can be significantly reduced. This results in a reduction of approximately 30% in the axial length of the rotating rack 20, approximately 10% in the rotation radius, and approximately 40% in the rack footprint, leading to a corresponding reduction in the room construction area. This space reduction further results in a reduction in civil engineering and shielding volume, easier installation and transportation, simplified rack structure and supporting facilities (such as cooling and power supply), and a decrease in overall construction and maintenance costs.

[0032] In this embodiment, as Figure 3 As shown, the two larger reverse deflection angles can "fold" the particle beam's transmission path more compactly, thereby simultaneously reducing the axial length and radial radius of the rotating frame 20: First, from a geometric perspective, the two large-angle deflections in opposite directions are equivalent to folding the beam back in an S-shape or Z-shape within a limited space, significantly reducing the projected length along the axial and radial directions of the frame. In other words, the total deflection is completed within a short distance, reducing the gap between the long drift segment and the magnetic element. Second, from the perspective of the magnet / track, the large-angle deflection can achieve an overall directional change using a shorter arc length combined with a suitable radius of curvature. Therefore, a long outer contour is no longer needed in the radial direction to accommodate the slowly curving track, and the rotation radius is reduced.

[0033] In one embodiment of the present invention, as Figure 3As shown, the first deflection section 51 includes a first deflecting magnet 511 and a second deflecting magnet 512, both of which have deflection angles less than 90°. In this embodiment, the first deflection section 51 uses two individual deflecting magnets, each with a deflection angle less than 90°, to share the total deflection. By splitting a large-angle deflection into two smaller-angle vertical deflections, the beam completes the direction conversion in a folded trajectory within the vertical plane. Since the deflection angle of each magnet is limited to within 90°, the geometry, yoke configuration, and coil winding of the individual magnets can be designed to be more conventional and compact, and the magnetic field distribution is easier to control.

[0034] In one embodiment of the present invention, the first deflection section 51 consists of two deflection magnets with the same deflection angle. The two magnets work together in sequence to complete the required total deflection angle—that is, to break down a large one-time deflection into two small deflections with equal angles. The symmetrical arrangement of the same angles facilitates the maintenance of trajectory and aberration symmetry in magnetic field design and beam current, simplifies the geometry and excitation design of the yoke and coil, and makes it easy to unify the magnetic field characteristics, drift segment length, and correction requirements of the two deflection segments. This reduces the dependence on fine asymmetric calibration and facilitates the realization of mechanical and magnetic alignment and matching.

[0035] Using two deflecting magnets at the same angle results in significant cost reduction: mass production using the same model, process, and mold reduces unit manufacturing cost and R&D expenses. This reduces the number of SKUs in procurement and inventory, increases spare parts versatility, and lowers supply chain and inventory management costs. Standardized inspection, debugging, and acceptance processes reduce testing time and equipment investment. Similar on-site transportation, installation, and hoisting processes save installation time and labor costs. Standardized power supply, control, and cooling systems reduce component types and engineering complexity. More symmetrical structural stress and heat loads reduce the need for special supports or reinforcement designs, thus reducing material and civil engineering costs. Fewer compensation requirements also reduce additional calibration components and operation and maintenance costs, comprehensively improving the economics of manufacturing, construction, and operation.

[0036] In one embodiment of the present invention, the deflection angles of the first deflecting magnet 511 and the second deflecting magnet 512 are 70°~80°, and can also be selected from any one angle or any two angles in the range: 70°, 72.5°, 75°, 77.5°, 80°, etc. The individual deflection angles of the first deflecting magnet 511 and the second deflecting magnet 512 are both 70°~80°, specifically 75° deflecting magnets. The two magnets work together at equal angles to complete a total deflection of approximately 150°. Limiting the deflection angle of each magnet to 75° maintains the design and manufacturing advantages of individual angles less than 90°, and also achieves a compact S-shaped folding trajectory through two equal-angle segments: the radius of curvature and arc length of a single 75° segment can be designed to be shorter, thus completing the total deflection within a shorter axial and radial distance. The equal-angle symmetrical arrangement helps reduce aberrations, simplifies the geometry of the yoke and coil, facilitates magnetic field adjustment, and reduces the additional drift or correction segments required to compensate for asymmetrical deflection.

[0037] In one embodiment of the present invention, as Figure 3 As shown, the deflection part located at the third bend position near the treatment head 30 away from the first deflection part 51 and the second deflection part 52 is the third deflection part 53. The deflection angle of the third deflection part 53 is 25°~35°, preferably a 30° deflection magnet. In one embodiment of the present invention, the deflection part located at the fourth bend position near the treatment head 30 away from the first deflection part 51, the second deflection part 52 and the third deflection part 53 is the fourth deflection part 54. The deflection angle of the fourth deflection part 54 is 25°~35°, preferably a 30° deflection magnet. The integral magnetic field (B·L) requirement corresponding to 30° is significantly lower than that of a large-angle bend, thus the core volume, winding length and excitation current of a single magnet can be reduced, directly reducing material and manufacturing costs. The shorter arc length and smaller lateral displacement reduce the magnet volume and weight, reducing transportation, on-site installation and lifting costs. The low edge field intensity resulting from the small deflection angle reduces the need for surrounding shielding and complex correction systems, thereby reducing the shielding volume and civil engineering investment.

[0038] In one embodiment of the present invention, as Figure 3As shown, multiple sets of focusing units 60 (preferably five sets, each focusing unit 60 being a quadrupole) are arranged between the first deflection section 51 and the second deflection section 52, and multiple sets of focusing units 60 (preferably three sets) are arranged between the third deflection section 53 and the fourth deflection section 54. In this embodiment, there is a large deflection between the first and second deflection sections, therefore, a greater number of quadrupoles (e.g., five sets of quadrupoles) are used than between the third and fourth deflection sections. Between the third and fourth deflection sections, the deflection is smaller, and fewer sets of quadrupoles (e.g., three sets of quadrupoles) are used to achieve beam spot control through a gentler gradient and a longer effective focal length, avoiding over-design. Overall, the number and parameters of the five and three sets of quadrupoles are directly determined by the deflection angle values ​​of each section, ensuring that the required beam stability can be achieved under different deflection intensities.

[0039] In one embodiment of the present invention, as Figure 3 As shown, an energy degrader 70 is disposed between the particle accelerator 10 and the fourth deflection section 54 to attenuate the high-energy particle beam extracted by the accelerator 10 to the required therapeutic energy range. The energy degrader 70 can employ absorbent materials of variable thickness (such as rotatable or graded wedge wheels, stepped damping plates, or adjustable stacked plates) to achieve rapid switching between different energy levels. Placing the energy degrader 70 between the accelerator and the fourth deflection section 54 allows for energy adjustment and primary purification before entering the subsequent deflection and treatment channels, ensuring that the downstream magnets are matched and adjusted according to the target energy conditions, thereby guaranteeing that the fourth deflection section 54 and the treatment head 30 receive the desired energy and incident parameters.

[0040] In one embodiment of the present invention, as Figure 3 As shown, an appropriate number of extraction magnets 80 (e.g., four sets of extraction magnets) are arranged between the particle accelerator 10 and the de-energizer 70 to extract the accelerated high-energy beam from the accelerator and send it into the de-energizer 70 with the required lateral displacement and incident angle. A focusing unit 60 (e.g., three sets of focusing units) is provided between the de-energizer 70 and the fourth deflection section 54. Its main function is to compensate for the beam spot expansion and angular divergence caused by the energy broadening introduced by the de-energizer 70 and multiple scattering.

[0041] like Figure 3 As shown, the beam from the particle accelerator 10 is drawn out from the extraction magnet 80, its energy is adjusted by the energy reducer 70, and then focused by three sets of quadrupole magnets, a slit, and 30° deflection magnets before being introduced onto the rotating gantry 20. The rotating gantry 20 uses 60° deflection magnets and five sets of quadrupole magnets to focus the beam, which is then guided towards the treatment beam direction by two sets of 75° deflection magnets. After passing through the treatment head 30, particle therapy is finally achieved.

[0042] like Figure 3As shown, in one embodiment of the present invention, a particle therapy device includes a particle accelerator 10 and a beam transmission device. The beam transmission device is used to transmit the particle beam emitted by the particle accelerator 10, and the beam transmission device includes a transmission pipe 50.

[0043] Along the particle transport direction, the beam transport device includes an energy reduction section, a transport section, a connecting section, and a treatment head 30 arranged sequentially on the transport pipe 50.

[0044] The energy reduction section includes multiple lead-out magnets 80 (preferably four) and an energy reducer 70, which is located downstream of the lead-out magnets 80.

[0045] The transmission section includes a first group of focusing units 60 (including multiple quadrupoles, preferably three), a fourth deflection section 54, a second group of focusing units 60 (including multiple quadrupoles, preferably three), and a third deflection section 53 arranged sequentially along the particle beam flow direction. The third deflection section 53 and the fourth deflection section 54 are located at the bends of the transmission pipe 50.

[0046] The connecting section includes a second deflection section 52 arranged sequentially along the particle beam flow direction, a third group of focusing units 60 (including multiple quadrupoles, preferably 5), and a first deflection section 51.

[0047] The first deflection part 51 includes at least two deflection magnets, the two deflection magnets having the same or different deflection angles. The first deflection part 51 is located at the bend position where the bending angle of the transmission pipe 50 is the largest, and the second deflection part 52 is located at the bend position of the transmission pipe 50.

[0048] The first deflection section 51, the second deflection section 52, the third deflection section 53, and the fourth deflection section 54 are used to change the direction of the particle beam. like Figure 4 As shown, Figure 5 This is a particle beam envelope detection diagram in one embodiment of the present invention. In one embodiment of the present invention, the cross-sectional envelope of the particle beam at various positions in the transmission pipe 50 meets the transmission requirements. Simultaneously, the beam envelope changes smoothly along the beam transmission line, and the dimensional margin of the beam pipe meets the design requirements. The particle beam transmission device provided by the present invention consists of a first deflection section 511 composed of at least two deflecting magnets. Compared to a single large-angle bent magnet, the required bending angle for each magnet is reduced, thereby reducing the weight and volume of a single magnet and simplifying the design of the yoke and coil, reducing manufacturing difficulty and cost. Miniaturization also facilitates segmented transportation, on-site hoisting and positioning, reducing the need for large lifting equipment and installation and commissioning time, thereby reducing transportation, installation, and commissioning costs.

[0049] like Figure 5 As shown, Figure 5This is a particle distribution diagram in phase space and real space of the beam spot at the isocenter in one embodiment of the present invention. In one embodiment of the present invention, the beam spot size, energy, flux intensity, and energy dissipation of the particle beam at the exit of the treatment head 30 meet relevant medical requirements.

[0050] In summary, this invention achieves synergistic optimization of optics and engineering by decomposing large bends into multiple smaller bends and rationally configuring the deflector 70, lead-out magnet 80, and distributed quadrupole focusing unit 60 in key sections. On the one hand, the bend angle, magnetic field strength, volume, and weight of individual deflecting magnets and quadrupoles are significantly reduced, facilitating mass production and standardized manufacturing, segmented transportation, and on-site hoisting, thereby reducing material and processing costs, transportation and installation / commissioning expenses, and dependence on large lifting equipment. On the other hand, the distributed focusing and symmetrical isoangular deflection design helps to efficiently suppress lateral divergence introduced by bending and the deflector 70 within a limited drift length, reducing beam loss, improving beam spot and energy purity, and thus enhancing dose delivery accuracy and operational stability. The compact S / Z folding trajectory reduces the axial length, rotation radius, and floor space of the rotating rack by approximately 30%, 10%, and 40%, respectively. This reduces the volume of civil engineering and shielding, and simplifies the equipment room setup (cooling, power supply, etc.). Simultaneously, the lower single-unit operating point reduces energy consumption and heat dissipation load, simplifies cooling and power supply configuration, and lowers long-term maintenance burden. Overall, this invention achieves comprehensive optimization of equipment miniaturization, cost reduction, simplified installation and commissioning, and operation, maintenance, and energy consumption while ensuring clinical beam quality and delivery accuracy. The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A particle therapy device, characterized in that, include: The organism, including particle accelerators; The treatment head is disposed on the body; A transmission conduit connects a particle accelerator and a treatment head to transmit a particle beam from the particle accelerator to the treatment head; The transmission pipeline includes a deflection section, and a deflection section is provided at each bend of the transmission pipeline. The deflection section is used to change the direction of the particle beam. The deflection part at the bend position with the largest bend angle of the transmission pipe is the first deflection part, and the first deflection part includes at least two deflection magnets.

2. The particle therapy device according to claim 1, characterized in that, The deflection part near the first bend of the treatment head is the first deflection part, and the deflection angle of the first deflection part is 90°~180°.

3. The particle therapy device according to claim 2, characterized in that, The deflection part located near the second bend of the treatment head is the second deflection part. The deflection angle of the second deflection part is 50°~70°, and the deflection angle of the first deflection part is 140°~160°. The deflection directions of the first deflection part and the second deflection part are opposite.

4. The particle therapy device according to claim 1, characterized in that, The first deflection part includes a first deflection magnet and a second deflection magnet, and the deflection angles of the first deflection magnet and the second deflection magnet are both less than 90°.

5. The particle therapy device according to claim 1, characterized in that, The first deflection part includes a first deflection magnet and a second deflection magnet, and the first deflection magnet and the second deflection magnet have the same deflection angle.

6. The particle therapy device according to claim 4, characterized in that, The deflection angles of the first deflecting magnet and the second deflecting magnet are 70°~80°.

7. The particle therapy device according to claim 3, characterized in that, The deflection part located near the third bend of the treatment head is the third deflection part, and the deflection angle of the third deflection part is 25°~35°.

8. The particle therapy device according to claim 7, characterized in that, The deflection part located near the fourth bend of the treatment head is the fourth deflection part, and the deflection angle of the fourth deflection part is 25°~35°.

9. The particle therapy device according to claim 8, characterized in that, Multiple sets of focusing units are provided between the first deflection part and the second deflection part, and multiple sets of focusing units are provided between the third deflection part and the fourth deflection part.

10. The particle therapy device according to claim 8, characterized in that, An energy depressor is provided between the particle accelerator and the fourth deflection section.

11. The particle therapy device according to claim 10, characterized in that, Multiple sets of lead-out magnets are provided between the particle accelerator and the de-energizer, and multiple sets of focusing units are provided between the de-energizer and the fourth deflection section.

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