Superconducting magnet equipment and radiotherapy system

Abstract

The invention relates to superconducting magnet equipment and a radiotherapy system. The superconducting magnet equipment is sequentially provided with a first annular installation cavity, a second annular installation cavity and a third annular installation cavity in the axial direction of the superconducting magnet equipment. A first superconducting coil is contained in the first annular mounting cavity, a second superconducting coil is contained in the third annular mounting cavity, cooling liquid is contained in the first annular mounting cavity, cooling liquid is contained in the third annular mounting cavity, and the first annular mounting cavity and the third annular mounting cavity are communicated with each other; a first air hole is formed in the first annular mounting cavity, and a second air hole is formed in the third annular mounting cavity; the superconducting magnet equipment is further provided with an air guide channel which is communicated with the first air hole and the second air hole; wherein the first air hole and the second air hole are formed above the axis of the superconducting magnet equipment, and the part, opposite to the second annular mounting cavity, of the air guide channel is formed below the axis of the equipment. The scattering of the treatment beam of the radiation treatment system formed by the superconducting magnet device is small in the transmission process, and the energy attenuation of the treatment beam is small.

Description

Technical Field

[0001] The present application relates to the technical field of medical equipment, and in particular to superconducting magnet equipment and radiotherapy systems. Background Art

[0002] Radiotherapy is an important local treatment method for malignant tumors. Specifically, the treatment head of the radiotherapy system generates a treatment beam, which is irradiated to the tumor in the patient's body to achieve the purpose of eliminating or reducing the tumor. After the treatment head in the existing radiotherapy system emits the treatment beam, the treatment beam needs to pass through the superconducting magnet device before it can irradiate the patient's treatment area. When the treatment beam passes through the superconducting magnet device, it will pass through the superconducting coil or the coolant used to cool the superconducting coil. This will cause the treatment beam to produce a certain amount of scattering or a certain amount of energy attenuation during the transmission process, which will ultimately lead to poor treatment effects on patients and low treatment efficiency. Summary of the invention

[0003] Based on this, it is necessary to provide a superconducting magnet device to address the technical problem that after the treatment head in the radiotherapy system emits the treatment beam, the treatment beam will be scattered and the energy will be attenuated when it is transmitted through the superconducting magnet device, which will lead to poor treatment effect and low treatment efficiency for the patient.

[0004] A superconducting magnet device, wherein the superconducting magnet device is sequentially configured with a first annular installation cavity, a second annular installation cavity and a third annular installation cavity along its axial direction;

[0005] A first superconducting coil is disposed in the first annular installation cavity, a second superconducting coil is disposed in the third annular installation cavity, the first annular installation cavity and the third annular installation cavity respectively contain cooling liquid, and the first annular installation cavity and the third annular installation cavity are connected;

[0006] The side wall of the first annular mounting cavity is configured with a first air hole, and the side wall of the third annular mounting cavity is configured with a second air hole; the superconducting magnet device is also configured with an air guide channel, which is connected to the first air hole and the second air hole; wherein the first air hole and the second air hole are arranged above the axis of the superconducting magnet device, and the part of the air guide channel opposite to the second annular mounting cavity is arranged below the axis of the superconducting magnet device.

[0007] In one embodiment, the air guiding channel includes a first air channel, a second air channel and a third air channel connected in sequence;

[0008] One end of the first gas channel away from the second gas channel is communicated with the first gas hole. The second gas channel is arranged below the superconducting magnet device in the axial direction. One end of the third gas channel away from the second gas channel is communicated with the second gas hole.

[0009] In one of the embodiments, the superconducting magnet device is further configured with a liquid guiding channel, one end of the liquid guiding channel is communicated with the first annular installation cavity, and the other end of the liquid guiding channel is communicated with the third annular installation cavity.

[0010] In one embodiment, the liquid guiding channel is arranged in the second annular mounting cavity;

[0011] The superconducting magnet device further includes an electrical connector, which is disposed in the liquid conducting channel, and two ends of the electrical connector are respectively connected to the first superconducting coil and the second superconducting coil.

[0012] In one embodiment, the second gas channel is arranged along the axial direction of the superconducting magnet device;

[0013] The central axis of the second gas channel, the central axis of the liquid guiding channel and the central axis of the superconducting magnet device are in the same plane.

[0014] In one embodiment, the superconducting magnet device comprises a first annular inner cylinder, a first annular outer cylinder, and a first annular outer vertical plate, a first annular inner vertical plate, a second annular inner vertical plate, and a second annular outer vertical plate spaced apart along the axial direction of the superconducting magnet device;

[0015] The first annular outer cylinder is sleeved on the outer circumference of the first annular inner cylinder and is spaced apart from the inner wall of the first annular inner cylinder, and the first annular outer vertical plate, the first annular inner vertical plate, the second annular inner vertical plate and the second annular outer vertical plate are respectively connected to the first annular inner cylinder and the first annular outer cylinder;

[0016] The first annular outer vertical plate, the first annular inner vertical plate, the first annular inner cylinder and the first annular outer cylinder are jointly arranged to form the first annular installation cavity; the first annular inner vertical plate, the second annular inner vertical plate, the first annular inner cylinder and the first annular outer cylinder are jointly arranged to form the second annular installation cavity; the second annular inner vertical plate, the second annular outer vertical plate, the first annular inner cylinder and the first annular outer cylinder are jointly arranged to form the third annular installation cavity.

[0017] In one embodiment, the superconducting magnet device also includes a first annular end plate, which is arranged on a side of the first annular outer vertical plate away from the first annular inner vertical plate, the first annular end plate is connected to the first annular inner cylinder and the first annular outer cylinder, and the first annular end plate is spaced apart from the first annular outer vertical plate to form the first gas channel.

[0018] In one embodiment, the superconducting magnet device also includes a second annular end plate, which is arranged on the side of the second annular outer vertical plate away from the second annular inner vertical plate, the second annular end plate is connected to the first annular inner cylinder and the first annular outer cylinder, and the second annular end plate is spaced apart from the second annular outer vertical plate to form the third gas channel.

[0019] In one embodiment, the thickness d1 of the first annular outer vertical plate satisfies the following conditions:

[0020] 0.5mm≤d1≤20mm;

[0021] The thickness d2 of the second annular outer vertical plate satisfies the following conditions:

[0022] 0.5mm≤d2≤20mm;

[0023] The width d3 of the first air channel satisfies the condition:

[0024] 1mm≤d3≤50mm;

[0025] The width d4 of the third air channel satisfies the following conditions:

[0026] 1mm≤d4≤50mm.

[0027] The present application also provides a radiotherapy system, which includes the superconducting magnet device described in any one of the above embodiments, and also includes a treatment bed and a treatment head assembly;

[0028] The treatment bed is arranged in a treatment space enclosed by the first annular installation cavity, the second annular installation cavity and the third annular installation cavity;

[0029] The treatment head assembly and the superconducting magnet device are arranged with intervals along the radial direction of the superconducting magnet device, and the treatment head assembly is arranged on the outer periphery of the second annular installation cavity; the treatment head assembly can emit a treatment beam and irradiate the treatment bed through the second annular installation cavity.

[0030] In one embodiment, the radiotherapy system further comprises a refrigeration component, wherein the refrigeration component is in communication with the first annular mounting cavity or in communication with the third annular mounting cavity;

[0031] The radiotherapy system further comprises a quench pipeline, wherein the quench pipeline is communicated with the first annular installation cavity or the third annular installation cavity.

[0032] When the superconducting magnet device is installed in a radiotherapy system, or the radiotherapy system is used directly, when the treatment head of the radiotherapy system emits a treatment beam, the treatment beam passes through the wall of the second annular installation cavity and directly irradiates the treatment space enclosed by the first annular installation cavity, the second annular installation cavity and the third annular installation cavity. During this transmission process, the treatment beam will not pass through the first superconducting coil and the second superconducting coil, thereby effectively reducing the energy attenuation of the treatment beam. Since the cooling gas vaporized by the coolant when cooling the two superconducting coils will pass through the air guide line formed by the first air hole, the air guide channel and the second air hole for air conduction, and the part of the air guide channel opposite to the second annular installation cavity is arranged below the axis of the superconducting magnet device, the treatment beam will not pass through the coolant and the cooling gas formed by the vaporization of the coolant during the transmission process, further reducing the scattering and energy attenuation of the treatment beam during the transmission process. When the radiotherapy system formed by the superconducting magnet device is used to treat patients, the scattering of the treatment beam during transmission is small, and the energy attenuation of the treatment beam is also small. The energy accuracy of the entire treatment beam is more accurate, and ultimately the treatment effect on the patient is better and the treatment efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of a radiotherapy system provided in accordance with an embodiment of the present application.

[0034] Figure 2 The first embodiment of the present application provides Figure 1 Schematic diagram of the superconducting magnet equipment, treatment head, cooling assembly and quench pipeline of the radiotherapy system shown.

[0035] Figure 3 for Figure 2 Schematic diagram of a superconducting magnet apparatus of a radiotherapy system is shown.

[0036] Figure 4 for Figure 3 The diagram shows a connection diagram of a first gas channel and a second gas channel of a superconducting magnet device.

[0037] Figure 5 The second embodiment of the present application provides Figure 1 Schematic diagram of the superconducting magnet equipment, treatment head, cooling assembly and quench pipeline of the radiotherapy system shown.

[0038] Figure 6 The third embodiment of the present application provides Figure 1Schematic diagram of the superconducting magnet equipment, treatment head, cooling assembly and quench pipeline of the radiotherapy system shown.

[0039] Figure 7 The fourth embodiment of the present application provides Figure 1 Schematic diagram of the superconducting magnet equipment, treatment head, cooling assembly and quench pipeline of the radiotherapy system shown.

[0040] Reference numerals: 100-superconducting magnet device; 111-first annular inner cylinder; 112-first annular outer cylinder; 121-first annular outer vertical plate; 122-first annular inner vertical plate; 123-second annular inner vertical plate; 124-second annular outer vertical plate; 125-first annular end plate; 126-second annular end plate; 127-third annular end plate; 128-fourth annular end plate; 131-first annular installation cavity; 1311-first air hole; 132-second annular installation cavity; 133-third annular installation cavity; 1331-second air hole; 140-air guiding channel; 141-first air channel; 142-second air channel; 143-third air channel; 150-liquid guiding channel; 161-first superconducting coil; 162-second superconducting coil; 170-treatment space; 181-heat shielding sleeve; 182-protective outer tube; 190-cooling liquid; 200-treatment bed; 300-treatment head assembly; 310-treatment head; 311-treatment beam; 320-mounting frame; 400-refrigeration assembly; 500-quench pipeline. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0042] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0043] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0045] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0047] Radiotherapy (RT) is an important local treatment method for malignant tumors. Medical linear accelerator is a large medical device used for cancer radiotherapy. It directly irradiates the tumor in the patient's body by generating X-rays and electron beams, thereby achieving the purpose of eliminating or reducing the tumor.

[0048] The traditional linear accelerator system guided by superconducting magnetic resonance has the accelerator mounting frame and treatment head arranged outside the superconducting magnetic resonance system. Generally, the therapeutic rays need to pass through the superconducting magnet assembly before they can irradiate the patient. Since the components of the superconducting magnet assembly are usually made of metal materials (such as stainless steel, aluminum alloy, resin materials, etc.), there will be a certain amount of energy attenuation when the therapeutic rays penetrate these materials, resulting in low treatment efficiency. In addition, the inner container of the superconducting magnet assembly is filled with liquid helium coolant, which will also cause attenuation or scattering of the therapeutic rays. At the same time, since the inner container cannot be 100% filled with liquid helium, there is usually no liquid helium on the upper part of the inner container. Therefore, when the therapeutic rays are radiated from the top and bottom of the circumference of the superconducting magnetic resonance system, the height of the liquid helium penetrated is completely different, which will also cause differences in radiation doses, thereby affecting its treatment accuracy and treatment effect.

[0049] In view of the above problems, the present application provides a superconducting magnet device and a radiotherapy system. Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 7 , Figure 2 The first embodiment of the present application provides Figure 1 FIG. 1 is a schematic diagram of a superconducting magnet device, a treatment head 310 , a cooling assembly 400 , and a quench circuit 500 of a radiotherapy system. Figure 3 Shows Figure 2 Schematic diagram of a superconducting magnet apparatus of a radiotherapy system is shown. Figure 5 The second embodiment of the present application provides Figure 1 FIG. 1 is a schematic diagram of a superconducting magnet device, a treatment head 310 , a cooling assembly 400 , and a quench circuit 500 of a radiotherapy system. Figure 6 The third embodiment of the present application provides Figure 1 FIG. 1 is a schematic diagram of a superconducting magnet device, a treatment head 310 , a cooling assembly 400 , and a quench circuit 500 of a radiotherapy system. Figure 7 The fourth embodiment of the present application provides Figure 1 FIG. 1 is a schematic diagram of a superconducting magnet device, a treatment head 310 , a cooling assembly 400 , and a quench circuit 500 of a radiotherapy system.

[0050] The superconducting magnet device provided in the embodiment of the present application is sequentially configured with a first annular installation cavity 131, a second annular installation cavity 132 and a third annular installation cavity 133 along its axial direction. Specifically, the axial direction of the superconducting magnet device is Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 7xx' direction in; the first annular installation cavity 131 is provided with a first superconducting coil 161, the third annular installation cavity 133 is provided with a second superconducting coil 162, the first annular installation cavity 131 and the third annular installation cavity 133 respectively contain a cooling liquid 190, and the first annular installation cavity 131 and the third annular installation cavity 133 are connected; the side wall of the first annular installation cavity 131 is configured with a first air hole 1311, and the side wall of the third annular installation cavity 133 is configured with a second air hole 1331; the superconducting magnet device is also configured with an air guide channel 140, and the air guide channel 140 is connected with the first air hole 1311 and the second air hole 1331; wherein the first air hole 1311 and the second air hole 1331 are arranged above the axis of the superconducting magnet device, and the part of the air guide channel 140 opposite to the second annular installation cavity 132 is arranged below the axis of the superconducting magnet device. Specifically, the axis of the superconducting magnet device is Figure 2 , Figure 3 , Figure 5 and Figure 6 The p line in .

[0051] When the superconducting magnet device is installed in a radiotherapy system, when the treatment head 310 of the radiotherapy system emits a treatment beam 311, the treatment beam 311 passes through the wall of the second annular installation cavity 132 and directly irradiates the treatment space 170 enclosed by the first annular installation cavity 131, the second annular installation cavity 132 and the third annular installation cavity 133. During this transmission process, the treatment beam 311 will not pass through the first superconducting coil 161 and the second superconducting coil 162, thereby effectively reducing the energy attenuation of the treatment beam 311. Since the cooling gas vaporized by the coolant 190 when cooling the two superconducting coils will be guided through the gas guide line formed by the first air hole 1311, the gas guide channel 140 and the second air hole 1331, and the part of the gas guide channel 140 opposite to the second annular installation cavity 132 is arranged below the axis P of the superconducting magnet device, the treatment beam 311 will not pass through the coolant 190 and the cooling gas formed by the vaporization of the coolant 190 during the transmission process, further reducing the scattering and energy attenuation of the treatment beam 311 during the transmission process. When the radiotherapy system formed by the superconducting magnet device is used to treat patients, the scattering of the treatment beam 311 during the transmission process is small, and the energy attenuation of the treatment beam 311 is also small, the energy accuracy of the entire treatment beam 311 is more accurate, and ultimately the treatment effect on the patient is better and the treatment efficiency is higher.

[0052] In one specific embodiment, the number of the first air hole 1311 is one. In another specific embodiment, the number of the first air hole 1311 is two or more.

[0053] In one specific embodiment, the number of the second air hole 1331 is one. In another specific embodiment, the number of the second air hole 1331 is two or more.

[0054] In one specific embodiment, the coolant 190 is liquid helium.

[0055] In one specific embodiment, the second annular installation cavity 132 is a vacuum environment, so that when the treatment beam 311 passes through the second annular installation cavity 132 , the scattering and energy attenuation of the treatment beam 311 can be further reduced.

[0056] The structure of the superconducting magnet device is described in detail below. Figure 4 Shows Figure 3 Schematic diagram of the connection between the first gas channel 141 and the second gas channel 142 of the superconducting magnet device shown in FIG. Figure 2-Figure 7 The gas-conducting channel 140 of the superconducting magnet device provided in some embodiments of the present application includes a first gas channel 141, a second gas channel 142, and a third gas channel 143 connected in sequence; the end of the first gas channel 141 away from the second gas channel 142 is connected to the first gas hole 1311, the second gas channel 142 is arranged below the axial direction of the superconducting magnet device, and the end of the third gas channel 143 away from the second gas channel 142 is connected to the second gas hole 1331. Through the connection of the three gas channels, the cooling gas vaporized by the coolant 190 when cooling the two superconducting coils can pass through the three gas channels for gas-conducting operation.

[0057] See also Figure 4 , Figure 4 Shows Figure 3 Schematic diagram of the connection between the first gas channel 141 and the second gas channel 142 of the superconducting magnet device shown in FIG. When the coolant 190 in the first annular installation cavity 131 cools the first superconducting coil 161, the cooling gas generated by the gasification of the coolant 190 passes through the first air hole 1311 and is Figure 4 The gas moves from the annular cavity indicated by the arrow direction to the second gas channel 142. As can be seen from the figure, the entire gas circulation area is larger, the time required for gas circulation is shorter, and it is faster.

[0058] It should be noted that when the superconducting coil in the normally working superconducting magnet device is irradiated by the high-energy treatment beam 311, it usually loses superconductivity, thereby causing the entire superconducting magnet device to quench. Specifically, when any parameter of temperature, magnetic field and current exceeds a critical value, the superconducting magnet will undergo a phase change and become a normal conductor. This process is called quenching. Therefore, it is necessary to set a refrigeration assembly 400 and a quenching pipeline 500 for the first superconducting coil 161 and the second superconducting coil 162.

[0059] In one embodiment, one of the first gas channel 141 or the third gas channel 143 is used to communicate with the refrigeration assembly 400, so that the cooling gas vaporized by the coolant 190 when cooling the two superconducting coils can quickly pass through the gas channel 140, and quickly condense and reflux through the refrigeration assembly 400, thereby achieving zero volatilization of the coolant 190, which is safer. Compared with the form in which both the first gas channel 141 and the third gas channel 143 are connected to a group of refrigeration assemblies 400 when the first gas channel 141 and the third gas channel 143 are not connected through the second gas channel 142, the present application only needs a group of refrigeration assemblies 400, and the structure of the entire superconducting magnet device is more compact and the economic benefits are better; at the same time, the air pressure strength in the first annular installation cavity 131 and the third annular installation cavity 133 is also closer, so that the air pressure stability of the entire superconducting magnet device is also higher.

[0060] When the superconducting magnet device is working normally, part of the liquid helium coolant 190 is volatilized into helium due to eddy current heating and other effects, and enters the upper part of the first annular installation cavity 131 and the third annular installation cavity 133. At this time, the volatilized cooling gas in the annular installation cavity away from the refrigeration component 400 can enter the annular installation cavity on the other side connected to the refrigeration component 400 through the gas guide channel 140. Then, the cooling gas that finally enters the refrigeration cavity in the refrigeration component 400 is condensed and refluxed, thereby achieving zero volatilization of the cooling liquid 190.

[0061] In another embodiment, one of the first gas channel 141 or the third gas channel 143 is used to communicate with the quench pipeline 500, so that the cooling gas vaporized by the coolant 190 when cooling the two superconducting coils can quickly pass through the gas channel 140 and quickly overflow through the quench pipeline 500, which is safer. At the same time, compared with the form in which both the first gas channel 141 and the third gas channel 143 are connected to a quench pipeline 500 when the first gas channel 141 and the third gas channel 143 are not connected through the second gas channel 142, the present application only needs one quench pipeline 500 to meet the requirements of safe discharge of the quench gas, and the structure of the entire superconducting magnet device is more compact and has better economic benefits.

[0062] In one of the embodiments, when a superconducting coil in an annular installation cavity on one side away from the refrigeration assembly 400 quenches, the cooling gas that rapidly evaporates in the annular installation cavity may also pass through the gas guide channel 140 into the annular installation cavity on the other side connected to the quench pipeline 500, thereby entering the quench pipeline 500 and overflowing, thereby avoiding a situation in which the cooling gas in the installation cavity on one side cannot be discharged and causes a pressure surge.

[0063] In one specific embodiment, the diameter of the first air hole 1311 is greater than or equal to 50 mm, thereby meeting the requirement of safe instantaneous gas release during quenching.

[0064] In one specific embodiment, the diameter of the second air hole 1331 is greater than or equal to 50 mm, thereby meeting the requirement of instantaneous safe release of gas during quenching.

[0065] In one specific embodiment, the heights of the first air hole 1311 and the second air hole 1331 are both higher than the liquid level of the coolant 190 in the first annular mounting cavity 131 and the second annular mounting cavity 132, thereby preventing the coolant 190 from entering the air guide channel 140 and blocking the air guide channel 140.

[0066] See also Figure 2 , Figure 3 and Figure 5-Figure 7 The superconducting magnet device provided in some embodiments of the present application is also constructed with a liquid guide channel 150, one end of which is connected to the first annular installation cavity 131, and the other end of which is connected to the second annular installation cavity 132. The liquid guide channel 150 is used to connect the first annular installation cavity 131 and the third annular installation cavity 133, so that the coolant 190 in the two annular installation cavities can circulate with each other. By setting the liquid guide channel 150, the coolant 190 in the first annular installation cavity 131 and the third annular installation cavity 133 can circulate with each other, and at the same time, the cooling gas vaporized by the coolant 190 in the first annular installation cavity 131 and the third annular installation cavity 133 is connected through the gas guide channel 140, so that the first annular installation cavity 131 and the third annular installation cavity 133 form a U-shaped tube structure, so that the air pressure in the two cavities is also the same, and the level of the coolant 190 in the two cavities is the same, which is safer.

[0067] See also Figure 2 , Figure 3 and Figure 5-Figure 7 The liquid conducting channel 150 of the superconducting magnet device provided in some embodiments of the present application is arranged in the second annular installation cavity 132; the superconducting magnet device also includes an electrical connector, which is arranged in the liquid conducting channel 150, and the two ends of the electrical connector are respectively connected to the first superconducting coil 161 and the second superconducting coil 162. By arranging the electrical connector in the liquid conducting channel 150 and connecting it to the superconducting coils on the left and right sides, the two superconducting coils on the left and right sides form a closed-loop superconducting coil, and then the manufacturing process of the two superconducting coils on the left and right sides is kept consistent with that of the traditional magnet, which greatly simplifies the manufacturing process of the magnet.

[0068] In one specific embodiment, the superconducting wire or electronic device is also arranged in the liquid guiding channel 150, and a lead shielding tube is also arranged around the superconducting wire or the electronic device to prevent the superconducting wire or the electronic device from being quenched or damaged by the high-energy treatment beam 311.

[0069] In one specific embodiment, the fluid-conducting channel 150 can be set at an angle that is not commonly used by the treatment beam 311, such as a horizontal direction or an oblique downward position, and does not have to be limited to the bottom.

[0070] See also Figure 2 , Figure 3 and Figure 5-Figure 7 , the second gas channel 142 of the superconducting magnet device provided in some embodiments of the present application is arranged along the axial direction of the superconducting magnet device. By arranging the second gas channel 142 along the axial direction of the superconducting magnet device, the second gas channel 142 is a linear structure along the axial direction of the superconducting magnet device, so that when designing a treatment plan, it is only necessary to perform intensity correction or set the position corresponding to the width occupied by the second gas channel 142 along the circumference of the superconducting magnet device as a scanning blind spot, thereby reducing the angle occupied by the scanning blind spot along the circumference of the superconducting magnet device, so that the entire superconducting magnet device has fewer restrictions during use, reducing the cooling gas formed by the treatment beam 311 passing through the coolant 190 and the vaporization of the coolant 190, and further reducing the scattering and energy attenuation generated by the treatment beam 311 during transmission.

[0071] See also Figure 2 , Figure 3 and Figure 5-Figure 7 , the central axis of the second gas channel 142 and the central axis of the liquid guide channel 150 of the superconducting magnet device provided in some embodiments of the present application are in the same plane as the axis P of the superconducting magnet device. By such an arrangement, when designing a treatment plan, it is only necessary to perform intensity correction or set the position corresponding to the width occupied by the second gas channel 142 and the liquid guide channel 150 along the circumference of the superconducting magnet as a scanning blind spot, thereby reducing the angle occupied by the scanning blind spot along the circumference of the superconducting magnet device, thereby retrieving the radiation blind angle of the ray, making the entire superconducting magnet device less restricted during use, reducing the cooling gas formed by the treatment beam 311 passing through the coolant 190 and the vaporization of the coolant 190, and further reducing the scattering and energy attenuation generated by the treatment beam 311 during transmission.

[0072] See also Figure 7 In one specific embodiment, the liquid guiding channel 150 is disposed inside the second gas channel 142, thereby saving space at the bottom of the entire superconducting magnet device.

[0073] In one specific embodiment, the cross-sectional area of ​​the second gas channel 142 along the axial direction of the superconducting magnet is circular, and can also be other shapes such as rectangle. Meanwhile, the second gas channel 142 can be a straight pipe, or other forms of pipes such as a curved pipe.

[0074] In one specific embodiment, the cross-sectional area of ​​the liquid-conducting channel 150 along the axial direction of the superconducting magnet is circular, and can also be other shapes such as rectangle. Meanwhile, the liquid-conducting channel 150 can be a straight pipe, or other forms of pipes such as a curved pipe.

[0075] See also Figure 2 , Figure 3 and Figure 5-Figure 7 The superconducting magnet device provided in some embodiments of the present application includes a first annular inner cylinder 111, a first annular outer cylinder 112, and a first annular outer vertical plate 121, a first annular inner vertical plate 122, a second annular inner vertical plate 123, and a second annular outer vertical plate 124 arranged at intervals along the axial direction of the superconducting magnet device; the first annular outer cylinder 112 is sleeved on the outer periphery of the first annular inner cylinder 111 and is spaced from the inner wall of the first annular inner cylinder 111, and the first annular outer vertical plate 121, the first annular inner vertical plate 122, the second annular inner vertical plate 123, and the second annular outer vertical plate 124 are respectively spaced from the first annular inner cylinder 111. The annular inner cylinder 111 is connected to the first annular outer cylinder 112; the first annular outer vertical plate 121, the first annular inner vertical plate 122, the first annular inner cylinder 111 and the first annular outer cylinder 112 are jointly arranged to form a first annular installation cavity 131; the first annular inner vertical plate 122, the second annular inner vertical plate 123, the first annular inner cylinder 111 and the first annular outer cylinder 112 are jointly arranged to form a second annular installation cavity 132; the second annular inner vertical plate 123, the second annular outer vertical plate 124, the first annular inner cylinder 111 and the first annular outer cylinder 112 are jointly arranged to form a third annular installation cavity 133.

[0076] By such an arrangement, the coolant 190 is isolated to flow in the first annular installation cavity 131 and the third annular installation cavity 133 to cool the first superconducting coil 161 and the second superconducting coil 162, while there is no coolant 190 in the second annular installation cavity 132 except for the positions of the gas guide channel 140 and the liquid guide channel 150, so that when the treatment beam 311 passes through the second annular installation cavity 132, the possibility of passing through the coolant 190 and the cooling gas formed by the vaporization of the coolant 190 is reduced, and the scattering and energy attenuation generated by the treatment beam 311 during the transmission process are further reduced.

[0077] See also Figure 2 , Figure 3 , Figure 5 and Figure 7The superconducting magnet device provided in some embodiments of the present application also includes a first annular end plate 125, which is arranged on the side of the first annular outer vertical plate 121 away from the first annular inner vertical plate 122, the first annular end plate 125 is connected to the first annular inner cylinder 111 and the first annular outer cylinder 112, and the first annular end plate 125 is spaced apart from the first annular outer vertical plate 121 to form a first gas channel 141; the superconducting magnet device also includes a second annular end plate 126, the second annular end plate 126 is arranged on the side of the second annular outer vertical plate 124 away from the second annular inner vertical plate 123, the second annular end plate 126 is connected to the first annular inner cylinder 111 and the first annular outer cylinder 112, and the second annular end plate 126 is spaced apart from the second annular outer vertical plate 124 to form a third gas channel 143.

[0078] By such arrangement, the structure of the first gas channel 141 and the third gas channel 143 is very simple and convenient, and the cost is also low; at the same time, due to the large surface area of ​​the first annular end plate 125 and the second annular end plate 126, the gas flow area of ​​the first gas channel 141 and the third gas channel 143 is also large, and also has a small flow resistance. For example, when the distance between the first annular end plate 125 and the first annular outer vertical plate 121 is 10mm, and the radius of the outer circle of the first annular end plate 125 is greater than the radius of the inner circle of the first annular end plate 125 by 400mm, the gas flow rate per unit area of ​​the first gas channel 141 is 8000mm. 2 , which is equivalent to the flow area of ​​a circular tube with a diameter of 100 mm. The superconducting magnet device can achieve a larger flow area and a smaller flow resistance without significantly increasing the axial length of the superconducting magnet device.

[0079] In one embodiment, the thickness d1 of the first annular outer vertical plate 121 satisfies the condition: 0.5 mm ≤ d1 ≤ 20 mm. By setting the thickness d1 of the first annular outer vertical plate 121 to be greater than or equal to 0.5 mm and less than or equal to 20 mm, the thickness of the first annular outer vertical plate 121 is reduced, thereby making the axial dimension of the entire superconducting magnet device smaller and the structure more compact.

[0080] It should be noted that when the superconducting magnet device provided by the present application experiences a quench phenomenon, the coolant 190 will vaporize into cooling gas and generate pressure at the same time. At this time, the first annular inner cylinder 111, the first annular outer cylinder 112 and the first annular end plate 125 are subjected to air pressure. Since the first annular mounting cavity 131 and the first air channel 141 are connected, the first annular outer vertical plate 121 arranged between the first annular mounting cavity 131 and the first air channel 141 does not bear pressure. Therefore, the first annular outer vertical plate 121 can be set to a thinner size, which not only makes the axial size of the entire superconducting magnet device smaller and the structure more compact, but also has better economic benefits.

[0081] In one embodiment, the thickness d2 of the second annular outer vertical plate 124 satisfies the condition: 0.5 mm ≤ d2 ≤ 20 mm. By setting the thickness d2 of the second annular outer vertical plate 124 to be greater than or equal to 0.5 mm and less than or equal to 20 mm, the thickness of the second annular outer vertical plate 124 is reduced, thereby making the axial dimension of the entire superconducting magnet device smaller and the structure more compact.

[0082] It should be noted that when the superconducting magnet device provided by the present application quenches, the coolant 190 will vaporize into cooling gas and generate pressure at the same time. At this time, the first annular inner cylinder 111, the first annular outer cylinder 112 and the second annular end plate 126 are subjected to air pressure. Since the second annular mounting cavity 132 and the second air channel 142 are connected, the second annular outer vertical plate 124 arranged between the second annular mounting cavity 132 and the second air channel 142 does not bear pressure. Therefore, the second annular outer vertical plate 124 can be set to a thinner size, which not only makes the axial size of the entire superconducting magnet device smaller and the structure more compact, but also has better economic benefits.

[0083] In one embodiment, the width d3 of the first gas channel 141 satisfies the condition: 1mm≤d3≤50mm. By setting the width d3 of the first gas channel 141 to be greater than or equal to 1mm and less than or equal to 50mm, the axial dimension of the entire superconducting magnet device is made smaller and the structure is more compact.

[0084] It should be noted that, in one embodiment, the radial diameter of the first annular end plate 125 is relatively large. When the radius of the outer circle of the first annular end plate 125 is much larger than the radius of the inner circle of the first annular end plate 125, for example, when the radius of the outer circle of the first annular end plate 125 is larger than the radius of the inner circle of the first annular end plate 125 by 400 mm, although the value of the width d3 of the first gas channel 141 is relatively small, the flow rate of the gas per unit area of ​​the first gas channel 141 is the product of 800 mm and the width d3, which is still relatively large. Therefore, the value of the first gas channel 141d3 can be set to a smaller value, so that the superconducting magnet device can achieve a larger flow area and a smaller flow resistance without significantly increasing the axial length of the superconducting magnet device.

[0085] In one embodiment, the width d4 of the third gas channel 143 satisfies the condition: 1mm≤d4≤50mm. By setting the width d4 of the third gas channel 143 to be greater than or equal to 1mm and less than or equal to 50mm, the axial dimension of the entire superconducting magnet device is made smaller and the structure is more compact.

[0086] It should be noted that, in one embodiment, the radial diameter of the second annular end plate 126 is relatively large. When the radius of the outer circle of the second annular end plate 126 is much larger than the radius of the inner circle of the second annular end plate 126, for example, when the radius of the outer circle of the second annular end plate 126 is larger than the radius of the inner circle of the second annular end plate 126 by 400 mm, although the width d4 of the third gas channel 143 is relatively small, the flow rate of the gas per unit area of ​​the third gas channel 143 is the product of 800 mm and the width d4, which is still relatively large. Therefore, the width d4 of the third gas channel 143 can be set to a smaller value, so that the superconducting magnet device can achieve a larger flow area and a smaller flow resistance without significantly increasing the axial length of the superconducting magnet device.

[0087] See also Figure 6In another embodiment, the superconducting magnet device further includes a third annular end plate 127, which is disposed on a side of the first annular inner vertical plate 122 close to the first annular outer vertical plate 121, the third annular end plate 127 is connected to the first annular inner cylinder 111 and the first annular outer cylinder 112, and the third annular end plate 127 is spaced apart from the first annular inner vertical plate 122 to form a first gas channel 141; the superconducting magnet device further includes a fourth annular end plate 128, the fourth annular end plate 128 is disposed on a side of the second annular inner vertical plate 123 close to the second annular outer vertical plate 124, the fourth annular end plate 128 is connected to the first annular inner cylinder 111 and the first annular outer cylinder 112, and the fourth annular end plate 128 is spaced apart from the second annular inner vertical plate 123 to form a third gas channel 143. By such arrangement, the first air passage 141 is arranged at a side of the first annular installation cavity 131 close to the second annular installation cavity 132 , and the third air passage 143 is arranged at a side of the third annular installation cavity 133 close to the second annular installation cavity 132 .

[0088] It should be noted that the first air channel 141 can be arranged in Figure 2 , Figure 3 and Figure 5 The first annular installation cavity 131 shown in the figure is away from the side of the second annular installation cavity 132, and can also be arranged as follows Figure 6 The first annular installation cavity 131 shown in the figure is close to one side of the second annular installation cavity 132; meanwhile, the third gas channel 143 can be arranged as follows Figure 2 , Figure 3 and Figure 5 The third annular installation cavity 133 shown in the figure is away from the side of the second annular installation cavity 132, and can also be arranged as follows: Figure 6 The third annular mounting cavity 133 shown is close to one side of the second annular mounting cavity 132. Of course, in other embodiments, the first air channel 141 and the third air channel 143 can also be respectively arranged in the middle of the first annular mounting cavity 131 and the third annular mounting cavity 133 or at any other position, without special limitation.

[0089] See also Figure 2 , Figure 3 , Figure 5 and Figure 7 The superconducting magnet device provided in one embodiment of the present application further includes a heat shielding sleeve 181 , which is sleeved on the outer circumference of the first annular inner cylinder 111 , the second annular outer cylinder, the first annular end plate 125 and the second annular end plate 126 .

[0090] See also Figure 6The superconducting magnet device provided in one embodiment of the present application further includes at least one heat shielding sleeve 181 , which is sleeved on the outer circumference of the first annular inner cylinder 111 , the second annular outer cylinder, the first annular outer vertical plate 121 and the second annular outer vertical plate 124 .

[0091] See also Figure 2 , Figure 3 and Figure 5-Figure 7 The superconducting magnet device provided in one embodiment of the present application further includes a protective outer cylinder 182, which is sleeved on the outer periphery of the heat shielding coil and is used to protect the heat shielding coil and the component structure inside the heat shielding coil.

[0092] In one specific embodiment, the pipe walls of the first annular inner cylinder 111, the first annular outer cylinder 112, the first annular outer vertical plate 121, the first annular inner vertical plate 122, the second annular inner vertical plate 124, the first annular end plate 125, the second annular end plate 126, the third annular end plate 127, the fourth annular end plate 128, the second gas channel 142 and the liquid guiding channel 150 are usually made of metal materials and are processed by mechanical and physical methods such as stamping, welding and casting. They can also be manufactured by polymer materials such as resin or fiber-reinforced composite materials and bonding. Generally, composite materials have less impact on radiation.

[0093] In one specific embodiment, the thickness of the pipe walls of the first annular inner cylinder 111, the first annular outer cylinder 112, the first annular outer vertical plate 121, the first annular inner vertical plate 122, the second annular inner vertical plate 124, the first annular end plate 125, the second annular end plate 126, the third annular end plate 127, the fourth annular end plate 128, the second gas channel 142 and the liquid guiding channel 150 are relatively thin, thereby further reducing the weight and cost of the entire superconducting magnet equipment.

[0094] See also Figure 1 The present application also provides a radiotherapy system, which includes the superconducting magnet device 100 described in any one of the above embodiments, and also includes a treatment bed 200 and a treatment head assembly 300; the treatment bed 200 is arranged in a treatment space 170 enclosed by the first annular installation cavity 131, the second annular installation cavity 132 and the third annular installation cavity 133; the treatment head assembly 300 and the superconducting magnet device 100 are arranged at intervals along the radial direction of the superconducting magnet device 100, specifically, the radial direction of the superconducting magnet device 100 is Figure 2-Figure 7 and the treatment head assembly 300 is disposed on the outer periphery of the second annular mounting cavity 132; the treatment head assembly 300 is capable of emitting a treatment beam 311 and irradiating the treatment bed 200 through the second annular mounting cavity 132.

[0095] When the radiotherapy system is used to perform radiotherapy on a patient, when the treatment head 310 emits the treatment beam 311, the treatment beam 311 passes through the cavity wall of the second annular installation cavity 132 and directly irradiates the treatment bed 200 in the treatment space 170 enclosed by the first annular installation cavity 131, the second annular installation cavity 132, and the third annular installation cavity 133. During this transmission process, the treatment beam 311 will not pass through the first superconducting coil 161 and the second superconducting coil 162, thereby effectively reducing the energy attenuation of the treatment beam 311. Since the cooling gas vaporized by the coolant 190 when cooling the two superconducting coils will be guided through the gas guide line formed by the first air hole 1311, the gas guide channel 140 and the second air hole 1331, and the part of the gas guide channel 140 opposite to the second annular installation cavity 132 is arranged below the axis p of the superconducting magnet device, the treatment beam 311 will not pass through the coolant 190 and the cooling gas formed by the vaporization of the coolant 190 during the transmission process, further reducing the scattering and energy attenuation of the treatment beam 311 during the transmission process. When the radiotherapy system formed by the superconducting magnet device is used to treat patients, the scattering of the treatment beam 311 during the transmission process is small, and the energy attenuation of the treatment beam 311 is also small, the energy accuracy of the entire treatment beam 311 is more accurate, and ultimately the treatment effect on the patient is better and the treatment efficiency is higher.

[0096] In one specific embodiment, the treatment head assembly 300 includes a treatment head 310 and a mounting frame 320. The mounting frame 320 is arranged around the periphery of the superconducting magnet device. The treatment head 310 is mounted on the mounting frame 320 and can perform a "drum-like" circumferential rotation around the axis of the mounting frame 320. The treatment head 310 includes components such as a linear accelerator, a target, and a collimator. The linear accelerator is used to accelerate electrons to generate an electron beam; the target can receive accelerated charged particles or ions to generate a treatment beam 311 for radiotherapy; and the collimator is used to control the shape of the treatment beam 311 for radiotherapy.

[0097] See also Figure 2 , Figure 3 , Figure 5 and Figure 6The radiotherapy system provided in some embodiments of the present application further includes a refrigeration assembly 400, which is in communication with the first annular installation cavity 131 or the third annular installation cavity 133. By providing the refrigeration assembly 400 in communication with the first annular installation cavity 131 or the third annular installation cavity 133, when the radiotherapy system is in use, when the coolant 190 contained in the first annular installation cavity 131 or the third annular installation cavity 133 cools the two superconducting coils, the cooling gas vaporized from the coolant 190 can quickly pass through the gas guide channel 140, and is quickly condensed and refluxed through the refrigeration assembly 400, thereby achieving zero volatilization of the coolant 190. Compared with the arrangement in which the first air channel 141 and the third air channel 143 are both connected to a set of refrigeration components 400 without being connected through the second air channel 142, the radiotherapy system provided by the present application only requires one set of refrigeration components 400, and the structure of the entire radiotherapy system is more compact and has better economic benefits. At the same time, the air pressure intensity in the first annular installation cavity 131 and the third annular installation cavity 133 is also closer, so that the air pressure stability of the entire superconducting magnet equipment is also higher.

[0098] See also Figure 2 , Figure 3 , Figure 5 and Figure 6 The radiotherapy system provided in some embodiments of the present application further includes a quench pipeline 500, which is communicated with the first annular installation cavity 131 or the third annular installation cavity 133. By providing the quench pipeline 500 communicated with the first annular installation cavity 131 or the third annular installation cavity 133, when the cooling liquid 190 contained in the first annular installation cavity 131 or the third annular installation cavity 133 cools the two superconducting coils during use of the radiotherapy system, the cooling gas vaporized from the cooling liquid 190 can quickly pass through the gas guide channel 140 and quickly overflow through the quench pipeline 500, which is safer. At the same time, compared with the form in which both the first gas channel 141 and the third gas channel 143 are connected to one quench pipeline 500 when the first gas channel 141 and the third gas channel 143 are not connected through the second gas channel 142, the present application only needs one quench pipeline 500 to meet the requirement of safe discharge of the quench gas, and the structure of the entire superconducting magnet device is more compact and the economic benefits are better.

[0099] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0100] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A superconducting magnet device, characterized in that: The superconducting magnet device is sequentially configured with a first annular installation cavity (131), a second annular installation cavity (132) and a third annular installation cavity (133) along its axial direction; A first superconducting coil (161) is disposed in the first annular installation cavity (131), a second superconducting coil (162) is disposed in the third annular installation cavity (133), the first annular installation cavity (131) and the third annular installation cavity (133) respectively contain cooling liquid (190), and the first annular installation cavity (131) and the third annular installation cavity (133) are connected; The side wall of the first annular installation cavity (131) is configured with a first air hole (1311), and the side wall of the third annular installation cavity (133) is configured with a second air hole (1331); the superconducting magnet device is also configured with an air guide channel (140), and the air guide channel (140) is connected with the first air hole (1311) and the second air hole (1331); wherein the first air hole (1311) and the second air hole (1331) are arranged above the axis of the superconducting magnet device, and the part of the air guide channel (140) opposite to the second annular installation cavity (132) is arranged below the axis of the superconducting magnet device.

2. The superconducting magnet device according to claim 1, characterized in that: The air guide channel (140) comprises a first air channel (141), a second air channel (142) and a third air channel (143) which are connected in sequence; One end of the first gas channel (141) away from the second gas channel (142) is connected to the first gas hole (1311), the second gas channel (142) is arranged below the axial direction of the superconducting magnet device, and one end of the third gas channel (143) away from the second gas channel (142) is connected to the second gas hole (1331).

3. The superconducting magnet device according to claim 2, characterized in that: The superconducting magnet device is also configured with a liquid guiding channel (150), one end of which is in communication with the first annular installation cavity (131), and the other end of which is in communication with the third annular installation cavity (133).

4. The superconducting magnet device according to claim 3, characterized in that: The liquid guiding channel (150) is arranged in the second annular installation cavity (132); The superconducting magnet device further comprises an electrical connector, which is arranged in the liquid conducting channel (150), and two ends of the electrical connector are respectively connected to the first superconducting coil (161) and the second superconducting coil (162).

5. The superconducting magnet device according to claim 3, characterized in that: The second gas channel (142) is arranged along the axial direction of the superconducting magnet device; The central axis of the second gas channel (142), the central axis of the liquid guiding channel (150) and the central axis of the superconducting magnet device are in the same plane.

6. The superconducting magnet device according to any one of claims 2 to 5, characterized in that: The superconducting magnet device comprises a first annular inner cylinder (111), a first annular outer cylinder (112), and a first annular outer vertical plate (121), a first annular inner vertical plate (122), a second annular inner vertical plate (123) and a second annular outer vertical plate (124) arranged in an axial direction of the superconducting magnet device at intervals. The first annular outer cylinder (112) is sleeved on the outer circumference of the first annular inner cylinder (111) and is spaced apart from the inner wall of the first annular inner cylinder (111), and the first annular outer vertical plate (121), the first annular inner vertical plate (122), the second annular inner vertical plate (123) and the second annular outer vertical plate (124) are respectively connected to the first annular inner cylinder (111) and the first annular outer cylinder (112); The first annular outer vertical plate (121), the first annular inner vertical plate (122), the first annular inner cylinder (111) and the first annular outer cylinder (112) are jointly arranged to form the first annular installation cavity (131); the first annular inner vertical plate (122), the second annular inner vertical plate (123), the first annular inner cylinder (111) and the first annular outer cylinder (112) are jointly arranged to form the second annular installation cavity (132); the second annular inner vertical plate (123), the second annular outer vertical plate (124), the first annular inner cylinder (111) and the first annular outer cylinder (112) are jointly arranged to form the third annular installation cavity (133).

7. The superconducting magnet device according to claim 6, characterized in that: The superconducting magnet device further comprises a first annular end plate (125), the first annular end plate (125) being arranged on a side of the first annular outer vertical plate (121) away from the first annular inner vertical plate (122), the first annular end plate (125) being connected to the first annular inner cylinder (111) and the first annular outer cylinder (112), and the first annular end plate (125) being spaced apart from the first annular outer vertical plate (121) to form the first gas channel (141).

8. The superconducting magnet device according to claim 6, characterized in that: The superconducting magnet device further comprises a second annular end plate (126), the second annular end plate (126) being arranged on a side of the second annular outer vertical plate (124) away from the second annular inner vertical plate (123), the second annular end plate (126) being connected to the first annular inner cylinder (111) and the first annular outer cylinder (112), and the second annular end plate (126) being spaced apart from the second annular outer vertical plate (124) to form the third gas channel (143).

9. A radiotherapy system, characterized in that: A superconducting magnet device comprising any one of claims 1 to 8, further comprising a treatment couch (200) and a treatment head assembly (300); The treatment bed (200) is arranged in a treatment space (170) enclosed by the first annular installation cavity (131), the second annular installation cavity (132), and the third annular installation cavity (133); The treatment head assembly (300) and the superconducting magnet device are arranged at intervals along the radial direction of the superconducting magnet device, and the treatment head assembly (300) is arranged on the outer periphery of the second annular installation cavity (132); the treatment head assembly (300) is capable of emitting a treatment beam (311) and irradiating the treatment bed (200) through the second annular installation cavity (132).

10. The radiation therapy system according to claim 9, characterized in that The radiotherapy system further comprises a refrigeration component (400), wherein the refrigeration component (400) is in communication with the first annular installation cavity (131) or the third annular installation cavity (133); The radiotherapy system further comprises a quench pipeline (500), wherein the quench pipeline (500) is in communication with the first annular installation cavity (131) or in communication with the third annular installation cavity (133).

Images