Rotary target for boron neutron capture therapy

Abstract

The utility model discloses a rotating target for boron neutron capture therapy, which comprises a rotating target assembly used in cooperation with a vacuum cavity, the rotating target assembly and the vacuum cavity are arranged in an integrated replaceable mode, a replaceable target layer sheet is arranged in the rotating target assembly, and a target cooling channel is arranged in the rotating target assembly. According to the rotating target for the boron neutron capture therapy, the rotating target assembly and the vacuum cavity are integrally replaceable, so that the rotating target assembly can be quickly replaced, and the target replacement operation is more convenient and quicker. The rotating target assembly can be integrally replaced according to the loss or damage condition of the target material, and only the target layer sheet at the damaged part can be replaced, so that the target material can be greatly saved, and the cost is reduced. The target cooling channel is arranged in the rotating target assembly, comprehensive cooling of the rotating target assembly is achieved through the target cooling channel, and material loss of the target material caused by high temperature is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear medicine radiotherapy, and particularly relates to a rotating target for boron neutron capture therapy. Background Art

[0002] Boron Neutron Capture Therapy (BNCT) is a binary treatment method that combines a targeted drug with a neutron beam. By irradiating tumor cells enriched with boron drug with a neutron beam of a certain energy, it is a cancer treatment technology. Among them, boron preferentially accumulates in the patient's malignant tumor, and the neutron beam passes through the patient and aims at the boron-containing tumor. The nuclear reaction limited within the tumor cells is used to destroy cancer cells, so as to achieve the effect of accurately killing cancer cells without damaging normal cells. This effect is highly localized. Therefore, this technology can be used as a highly selective cancer treatment method and only acts on specifically targeted cells.

[0003] The target is the main component for neutron generation. Currently, the mainly used ones are fixed targets and rotating targets. The rotating target is provided with neutron source material. When the rotating target rotates, the proton beam generated by the proton beam generator can be guided to the neutron source material, thereby generating neutrons.

[0004] Since the neutron source material on the target is generally made of lithium material, and lithium has a relatively low melting point of 180 °C and a medium thermal conductivity of 85 W / mK. The energy of the proton beam is dissipated as heat in the target and is not removed sufficiently, and the target will be damaged. At the same time, the strong proton beam can quickly cause foaming and other damages to the target material. Therefore, it will affect the service life of the target and requires frequent target replacement. And frequent target replacement has many problems such as complex operation, inability to ensure sealing, inconvenient disassembly, and radiation.

[0005] In the prior art, a cooling channel is arranged inside the rotating target and cooling treatment is realized by introducing a cooling medium, so as to reduce the damage of the target material. However, the existing cooling channel has a complex structure and the cooling effect is not significant. Moreover, although the cooling structure is used for cooling, the replacement of the target material is inevitable. The replacement of the target in the prior art requires the target to be disassembled from the inside of the vacuum cavity and then replaced. This makes the replacement efficiency low, the operation complex, and there are radiation problems. Summary of the Utility Model

[0006] The purpose of the utility model is to solve the problems of poor cooling effect, inconvenient replacement, and complex operation of the existing target, and to provide a rotating target for boron neutron capture therapy with good cooling effect, long service life of the target, and which can realize the individual replacement of the target material, the overall replacement of the rotating target, and the replacement of the rotating target together with the vacuum cavity.

[0007] The technical solution adopted by the present utility model to achieve its invention purpose is: a rotating target for boron neutron capture therapy, which includes a rotating target assembly used in cooperation with a vacuum chamber. The rotating target assembly is arranged in an integrated replaceable manner with the vacuum chamber. A replaceable target layer sheet is arranged in the rotating target assembly, and a target cooling channel is arranged in the rotating target assembly. For this rotating target for boron neutron capture therapy, the rotating target assembly and the vacuum chamber are designed to be integrally replaceable. When the rotating target assembly needs to be replaced, the vacuum chamber and the rotating target assembly are taken off from the equipment main body together for overall replacement, realizing the quick replacement operation of the rotating target assembly, making the target replacement operation more convenient and fast. At the same time, the replaced rotating target assembly can be integrally replaced according to the loss or damage of the target material, or only the target layer sheet at the damaged part can be replaced, which can greatly save the target material and reduce the cost. The design of the replaceable target layer sheet allows only the target layer to be replaced, while other components can be reused, saving the manufacturing process and cost, and making the target layer replacement more convenient. In order to improve the service life of the rotating target assembly, reduce the replacement steps, and improve the utilization rate, a target cooling channel is arranged inside the rotating target assembly, and through the target cooling channel, comprehensive cooling of the rotating target assembly is achieved, effectively avoiding the material loss of the target material caused by high temperature.

[0008] Preferably, the rotating target assembly includes a target shaft and a target disk assembly. The target disk assembly is arranged inside the vacuum chamber. The target shaft and the vacuum chamber form a vacuum sealing structure through a group of magneto - hydrodynamic sealing components. The rotating target assembly mainly includes a target shaft and a target disk assembly. The target disk assembly is arranged inside the vacuum chamber. One end of the target shaft is arranged inside the vacuum chamber, and the other end is arranged outside the vacuum chamber, and a vacuum sealing structure is formed with the vacuum chamber through a group of magneto - hydrodynamic sealing components, which not only realizes effective sealing, ensures the use performance of the rotating target assembly, but also reduces the risk of radiation leakage. The target shaft is designed as a part of the vacuum chamber to facilitate the integrated replaceable design of the vacuum chamber and the rotating target assembly.

[0009] Preferably, the target disk assembly is connected to one end of the target shaft extending into the vacuum chamber through a coupling. The target disk assembly is connected to the target shaft through a coupling and is driven to rotate by the target shaft.

[0010] Preferably, the target cooling channel includes a target shaft cooling channel and a target disk cooling channel, the target shaft cooling channel includes a liquid inlet channel and a liquid outlet channel arranged inside the target shaft, and the target disk cooling channel includes a target disk liquid inlet channel and a target disk liquid outlet channel arranged inside the target disk. In order to achieve comprehensive cooling of the rotating target assembly, the target cooling channel mainly includes a target shaft cooling channel and a target disk cooling channel, and the target shaft cooling channel mainly includes a target inlet channel and a liquid outlet channel, and the target disk cooling channel mainly includes a target disk liquid inlet channel and a target disk liquid outlet channel. Through the design of the liquid inlet and outlet channels, a circulation design of the coolant is achieved to implement comprehensive and continuous cooling of the rotating target assembly.

[0011] Preferably, the target plate assembly includes a target plate base and a target plate movably connected to the target plate base through a plurality of clamping assemblies. In order to realize the replaceable design of the target layer, the target plate assembly mainly includes a target plate base and a target plate detachably and replaceably connected to the target plate base. In order to ensure the connection strength during use, a clamping assembly is provided between the target plate base and the target plate, and two sets of clamping assemblies are provided for each target layer sheet to realize the clamping positioning of the target layer sheet.

[0012] Preferably, the target plate includes a cooling layer and a target layer, the target layer is formed by enclosing a plurality of replaceable target layer sheets, and the target layer is attached to the cooling layer. The target plate mainly includes a cooling layer and a target layer, the target layer is an annular body formed by enclosing a plurality of replaceable target layer sheets, and the cooling layer is mainly used for comprehensive cooling of the target layer, and at the same time, it is convenient for setting and replacing the target layer.

[0013] Preferably, a plurality of cooling channels are arranged inside the cooling layer; a plurality of capillary cooling channels connected to the cooling channels are arranged on the target layer; the capillary cooling channels and the cooling channels form a part of the target plate cooling channel. The cooling channels are arranged inside the cooling layer, and the capillary cooling channels are arranged on the target layer, so that direct cooling of the target layer can be achieved. The cooling channels and the capillary cooling channels form a part of the target plate cooling channel, which are used to form the target plate cooling channel together with the target plate base cooling channel, so as to achieve comprehensive cooling of the target plate, especially the target layer.

[0014] Preferably, the capillary cooling channel is a plane return circulation structure; or the capillary cooling channel is a three-dimensional space flow cooling structure. In order to achieve comprehensive cooling of the target layer, the capillary cooling channel can be designed as a plane return circulation structure, that is, circulation cooling on the same level of the target layer, or it can be set as a three-dimensional space flow cooling structure, that is, reciprocating circulation cooling on two levels of the target layer. The capillary cooling channel can be set as various structures such as radial parallel type, circumferential parallel type, radial emission type, radial or circumferential return type as needed, as long as it can meet the comprehensive cooling requirements.

[0015] Preferably, a capillary cooling channel inlet and a capillary cooling channel outlet communicating with the capillary cooling channel are provided on the target layer sheet. The design of the capillary cooling channel inlet and the capillary cooling channel outlet is to facilitate the effective entry of the cooling liquid into the capillary cooling channel for circulation and the discharge of the cooled circulating cooling liquid, thereby protecting the continuous and effective circulating cooling of the target layer.

[0016] Preferably, a target disk base cooling channel is provided inside the target disk base, and the target disk base cooling channel forms a part of the target disk cooling channel. The provision of the target disk base cooling channel inside the target disk base is to achieve the connected circulation design of the entire target disk cooling channel to ensure that the cooling liquid can circulate and cool inside the target disk.

[0017] Preferably, the clamping assembly includes a rotating seat provided on the target disk base and a hook provided on the rotating seat. A sliding groove is provided on the hook, and an electromagnet is provided on the target disk base corresponding to the hook. A push rod is provided on the electromagnet, and the push rod is inserted into the sliding groove and can move along the sliding groove. The above structure of the clamping assembly can ensure the clamping and positioning of the target layer sheet. At the same time, it can also facilitate the overall replacement of the target layer or the individual replacement of the target layer sheet.

[0018] Preferably, a conversion part is provided at one end of the target shaft, and a liquid distributor is provided at the other end of the target shaft. The conversion part is provided at the driving end of the target shaft to convey the external cooling liquid into the target shaft through the conversion part, while the liquid distributor is provided at the vacuum end of the target shaft to evenly convey the cooling liquid inside the target shaft into the target disk assembly and at the same time convey the cooled circulating cooling liquid back into the target shaft.

[0019] Preferably, a target sheet connecting seat is provided on the target layer sheet, and a connecting pin hole is provided on the target sheet connecting seat. For the replaceable setting of the target layer sheet, a target sheet connecting seat is integrally provided on the target layer sheet for clamping and fixing with the target disk base. The design of the connecting lock hole is to facilitate the positioning between the target layer sheet and the target disk base through a pin shaft.

[0020] Preferably, the rotating target assembly further includes a power source and a transmission assembly. In order to implement the rotation of the rotating target assembly inside the vacuum chamber, the rotating target assembly further includes a power source and a transmission assembly for driving the rotation of the rotating target assembly.

[0021] The beneficial effects of the present utility model are as follows: For the rotating target used in boron neutron capture therapy, the rotating target assembly and the vacuum cavity are integrally replaceable. When the rotating target assembly needs to be replaced, the vacuum cavity and the rotating target assembly are removed from the equipment main body together for overall replacement, realizing the rapid replacement operation of the rotating target assembly and making the target replacement operation more convenient and fast. The rotating target assembly can be integrally replaced according to the wear or damage of the target material, or only the target layer sheet at the damaged part can be replaced, which can greatly save the target material and reduce the cost. The replaceable target layer sheet can only replace the target layer, while other components can be reused, saving the manufacturing process and cost. A target cooling channel is arranged inside the rotating target assembly, and the rotating target assembly is comprehensively cooled through the target cooling channel, effectively avoiding the material loss of the target material caused by high temperature. Brief Description of the Drawings

[0022] Figure 1 is a schematic structural view of the rotating target for boron neutron capture therapy of the present utility model.

[0023] Figure 2 is a front view of the rotating target for boron neutron capture therapy of the present utility model.

[0024] Figure 3 is Figure 2 the sectional view A-A in

[0025] Figure 4 is Figure 2 the sectional view B-B in

[0026] Figure 5 is a schematic structural view of the rotating target assembly in the present utility model.

[0027] Figure 6 is a schematic structural view of the rotating target assembly from another angle in the present utility model.

[0028] Figure 7 is a schematic structural view of the rotating part in the present utility model.

[0029] Figure 8 is a sectional view of the rotating part in the present utility model.

[0030] Figure 9 is a schematic structural view of the liquid diverter in the present utility model.

[0031] Figure 10 is an exploded schematic structural view of the liquid diverter in the present utility model.

[0032] Figure 11 is a schematic structural view of the target layer sheet in the present utility model.

[0033] Figure 12It is another sectional view of the rotating part of the present utility model.

[0034] Figure 13 It is a schematic exploded view of the target disk assembly in the present utility model.

[0035] Figure 14 It is another schematic view of the target layer sheet in the present utility model.

[0036] Figure 15 It is a schematic application structure view of the rotating target for boron neutron capture therapy of the present utility model.

[0037] In the figure: 1. Rotating target assembly, 2. Vacuum cavity, 3. Driving part, 4. Rotating part, 5. Power source,

[0038] 6. Transmission assembly, 61. Driving wheel, 62. Transmission belt, 63. Driven wheel;

[0039] 7. Target disk assembly;

[0040] 71. Target disk base, 711. Inner base ring, 712. Outer base ring, 713. Rib, 714. Coupling connection hole, 715. Inner ring cooling hole, 716. Outer ring cooling hole, 717. Rib cooling channel, 717-1. Rib cooling channel inlet, 717-2. Rib cooling channel outlet, 718. Pin shaft, 719. Magnet positioning groove;

[0041] 72. Target disk;

[0042] 73. Clamping assembly, 731. Rotating seat, 732. Hook, 733. Electromagnet, 734. Slide groove, 735. Push rod;

[0043] 75. Cooling layer, 751. Cooling flow channel;

[0044] 76. Target layer, 761. Target layer sheet, 762. Target sheet connection seat, 763. Connection pin hole, 764. Capillary cooling channel, 765. Capillary cooling channel inlet, 766. Capillary cooling channel outlet;

[0045] 8. Target shaft, 9. Magnetic fluid seal assembly, 10. Coupling, 11. Converter, 12. Water passing cavity, 13. Liquid diverter,

[0046] 14. Diverter water inlet body, 141. Inlet cavity, 142. Inlet nozzle;

[0047] 15. Diverter water outlet body;

[0048] 151. Outlet cavity, 152. Outlet nozzle;

[0049] 100, equipment main body; 200, target disk cooling channel; 300, target shaft cooling channel. Detailed implementation mode

[0050] The following describes each aspect of the present utility model in detail through specific embodiments in combination with the drawings.

[0051] Embodiment 1:

[0052] In Figure 1 , Figure 2 , Figure 3 , Figure 4 In the illustrated embodiment, a rotating target for boron neutron capture therapy includes a rotating target assembly 1 and a vacuum cavity 2 hermetically connected to the rotating target assembly 1. The rotating target assembly 1 and the vacuum cavity 2 are arranged in an integrated replaceable manner. A replaceable target layer sheet 761 is provided in the rotating target assembly 1, and a target cooling channel is provided in the rotating target assembly 1. The target cooling channel includes a target shaft cooling channel 300 and a target disk cooling channel 200. The target shaft cooling channel 300 includes a liquid inlet channel 81 and a liquid outlet channel 82 provided inside the target shaft, and the target disk cooling channel 200 includes a target disk liquid inlet channel and a target disk liquid outlet channel provided inside the target disk.

[0053] The rotating target assembly 1 includes a driving part 3 and a rotating part 4. The driving part 3 includes a power source 5 and a transmission assembly 6. The transmission assembly 6 adopts various mechanical transmission methods such as belt drive, chain drive, or gear drive, and can also adopt an electric transmission method. The power source 5 adopts an electric motor.

[0054] In this embodiment, the transmission assembly 6 adopts belt drive. The transmission assembly 6 includes a driving wheel 61 connected to the output shaft of the electric motor, a transmission belt 62, and a driven wheel 63 provided on the rotating part 4.

[0055] The rotating part 4 includes a target disk assembly 7, a target shaft 8, a magnetic fluid seal assembly 9, a coupling 10, and a converter 11 provided on the target shaft 8. In this embodiment, the converter 11 adopts a rotary joint. The target shaft 8 is part of the vacuum cavity 2 and can be replaced together with the vacuum cavity.

[0056] A liquid inlet channel 81 and a liquid outlet channel 82 penetrating both ends of the target shaft 8 are provided inside the target shaft 8. On the outer circumference of the target shaft 8, a driven wheel mounting part 83, a bearing seal part 84, and a coupling mounting part 85 are sequentially arranged from the transmission end to the target disk assembly end.

[0057] A conversion part 11 is provided at the driving end of the target shaft 5. Two coaxial water channels 12 are provided on the conversion connector 11. The two water channels 12 are respectively communicated with the liquid inlet channel 81 and the liquid outlet channel 82 inside the target shaft 8 and are connected to an external liquid inlet pipe and an external liquid outlet pipe.

[0058] The driven wheel 63 is installed on the driven wheel installation part 83, the magneto-fluid sealing assembly 9 is installed on the bearing sealing part 84, and the coupling 10 is installed on the coupling installation part 85.

[0059] As Figure 9 、 Figure 10 As shown in, at one end of the target shaft 8 where the coupling 10 is provided, a liquid diverter 13 is provided. The liquid diverter 13 includes a diverter water inlet body 14 and a diverter water outlet body 15.

[0060] An inlet water chamber 141 and a plurality of inlet nozzles 142 communicating with the inlet water chamber 141 are provided on the diverter water inlet body 14. An outlet water chamber 151 and a plurality of outlet nozzles 152 communicating with the outlet water chamber 151 are provided on the diverter water outlet body 15. The inlet water chamber 141 communicates with the liquid inlet channel 81, and the outlet water chamber 151 communicates with the liquid outlet channel 82.

[0061] As Figure 5 、 Figure 6 、 Figure 7 As shown in, the target disk assembly 7 includes a target disk base 71 and a target disk 72 that is movably clamped to the target disk base 71 through a plurality of clamping assemblies 73.

[0062] The target disk 72 includes a cooling layer 75 and a target layer 76. The target layer 76 includes a plurality of target layer sheets 761 that are evenly distributed and arranged in a fan shape. The plurality of target layer sheets 761 enclose to form the target layer, and the target layer 76 is attached to the cooling layer 75. A plurality of cooling channels 751 are provided inside the cooling layer 75.

[0063] As Figure 11 As shown in, a target sheet connecting seat 762 is provided on the target layer sheet 761, and a connecting pin hole 763 is provided on the target sheet connecting seat 762.

[0064] As Figure 12 As shown in, a plurality of capillary cooling channels 764 are provided on the target layer sheet 761. The capillary cooling channels 764 communicate with the cooling channels 751 and are used to directly cool the target layer sheet 761. The capillary cooling channels 764 and the cooling channels 751 form a part of the target disk cooling channel.

[0065] A capillary cooling channel inlet 765 and a capillary cooling channel outlet 766 are provided on the target layer sheet 761. The capillary cooling channel 764 adopts a planar folding-back circulation structure, that is, the capillary cooling channels are evenly distributed on the same side of the target layer sheet, and the overall capillary cooling channel has a reciprocating structure. The cooling medium enters from the capillary cooling channel inlet 765 on the target layer sheet, completes the cooling of one target layer sheet through the folding-back circulation, and then returns from the capillary cooling channel outlet. The capillary cooling channel 764 is arranged in a parallel structure along the radial direction of the target layer sheet. In another embodiment, the capillary cooling channel 764 is arranged along the circumferential direction of the target layer sheet and is coaxial with the target layer sheet. In other embodiments, the capillary cooling channel 764 is arranged in an emission structure along the radial direction of the target layer sheet. In short, the specific structure of the capillary cooling channel 764 can be arranged according to the specific structure of the target layer sheet to achieve the purpose of comprehensive cooling.

[0066] As Figure 13 shown, the clamping assembly 73 includes a rotating seat 731 provided on the side surface of the target disk base 71, a hook 732 provided on the rotating seat 731, and an electromagnet 733. The hook 732 is rotatably arranged on the rotating seat 731. A chute 734 is provided on the hook 732, and a push rod 735 is provided on the electromagnet 733. The push rod 735 is inserted into the chute 734 and can move along the chute 734.

[0067] The target disk base 71 includes an integrally provided base inner ring 711, a base outer ring 712, and a plurality of ribs 713 connecting the base inner ring 711 and the base outer ring 712. A coupling connection hole 714 is provided on the end surface of the base inner ring 711. The end surface of the coupling 10 is fixedly connected to the base inner ring 711 through a connecting member provided inside the coupling connection hole 714. A plurality of inner ring cooling holes 715 are provided on the inner ring surface of the base inner ring 711, outer ring cooling holes 716 are provided on the outer ring surface of the base outer ring 712, and a rib cooling channel 717 communicating the inner ring cooling holes 715 and the outer ring cooling holes 716 is provided inside the ribs 713. The inner ring cooling holes 715 are respectively communicated with the water inlet nozzle 142 and the water outlet nozzle 152 through a liquid spraying pipeline.

[0068] The rib cooling channel 717 includes a rib cooling channel inlet 717-1 and a rib cooling channel outlet 717-2. The inner ring cooling holes 715, the outer ring cooling holes 716, and the rib cooling channel 717 form the target disk base cooling channel. The target disk base cooling channel forms a part of the target disk cooling channel. The inner ring cooling holes 715, the outer ring cooling holes 716, the rib cooling channel 717, the cooling flow channel 751, and the capillary cooling channel 764 together form the target disk cooling channel 200.

[0069] The liquid inlet channel 717-1 of the rib cooling channel is connected to the inlet 765 of the capillary cooling channel, and the liquid outlet channel 717-2 of the rib cooling channel is connected to the outlet 766 of the capillary cooling channel.

[0070] As Figure 8 shown, the cooling circulation path of the rotating part 4 includes that the cooling medium inside the external liquid inlet pipe enters the liquid inlet channel 81 inside the target shaft 8 from the water passing cavity 12 inside the adapter, enters the water inlet cavity 141 on the water inlet body 14 of the diverter and is sprayed through the water inlet nozzle 142 into the liquid inlet channel 717-1 of the rib cooling channel, enters the cooling flow channel 751, then enters the capillary cooling channel 764 through the inlet 765 of the capillary cooling channel for planar cooling circulation, and then returns to the cooling flow channel 751 through the outlet 766 of the capillary cooling channel, passes through the liquid outlet channel 717-2 of the rib cooling channel and the inner ring cooling holes 715, returns to the water outlet nozzle 152, then passes through the water outlet cavity 151 and the liquid outlet channel 82, returns to the water passing cavity 12, and finally returns to the external liquid outlet pipe through the water passing cavity 12 to realize reciprocating cycle cooling.

[0071] The cooling medium can be one or more of water, liquid nitrogen and / or other coolants. Water cooling is adopted in this embodiment.

[0072] A plurality of positioning holes are further provided on the circumferential surface of the outer ring 712 of the base, and a pin shaft 718 is arranged inside the positioning holes. The pin shaft 718 is used to position the target disc. A plurality of magnet positioning grooves 719 are further provided on the circumferential surface of the outer ring 712 of the base, and the electromagnet 733 is fixed inside the magnet positioning groove 719 through a positioning pin.

[0073] The target disc 72 is arranged on the outer circumferential surface of the target disc base 71, and the target layer piece 761 is positioned through the pin shaft 718 with the positioning holes on the outer ring 712 of the base.

[0074] The clamping assembly 73 is arranged on the side of the target disc base 71 facing the coupling 10. Specifically, the rotating seat 731 is fixed on the outer ring 712 of the base, and the hook 732 is clamped on the target piece connecting seat 762 to realize the clamping and positioning of the target layer piece 761. At this time, the electromagnet 733 is located below the clamping part of the target layer piece 761 and the hook 732, that is, the target layer piece 761 is pressed on the electromagnet 733.

[0075] The vacuum chamber 2 includes a target disc chamber 21 and an installation chamber 22. The coupling 10 and the target disc assembly 7 are arranged inside the target disc chamber 21. The magneto-fluid sealing assembly 9 is matched with the installation chamber 22 to realize a sealed transmission connection, and the driving end of the target shaft 8 is arranged outside the installation chamber 22.

[0076] As Figure 15As shown in the figure, during use, the target shaft 8, which is part of the vacuum chamber 2, can be removed from the treatment device main body 100 together with the rotating part 4 for replacement. This realizes fast target replacement operation. Since the vacuum chamber 2 and the rotating part 4 are set together and replaced together, the sealing problem and the radiation problem during the target replacement process are solved.

[0077] Embodiment 2:

[0078] In Figure 14 In the embodiment shown, a rotating target for boron neutron capture therapy includes a rotating target assembly 1 and a vacuum chamber 2 hermetically connected to the rotating target assembly 1.

[0079] The rotating target assembly 1 includes a driving part 3 and a rotating part 4. The driving part 3 includes a power source 5 and a transmission assembly 6. The transmission assembly 6 adopts a gear transmission method. The power source 5 adopts an electric motor.

[0080] The transmission assembly 6 includes a driving gear connected to the output shaft of the motor and a driven gear arranged on the rotating part 4 and meshing with the driving gear.

[0081] The rotating part 4 includes a target disk assembly 7, a target shaft 8, a magnetic fluid seal assembly 9, a coupling 10, and a converter 11 arranged on the target shaft 8. In this embodiment, the converter 11 adopts a rotary joint. The target shaft 8, which is part of the vacuum chamber 2, can be replaced together with the vacuum chamber.

[0082] A liquid inlet channel 81 and a liquid outlet channel 82 that penetrate through both ends of the target shaft 8 are arranged inside the target shaft 8. On the outer circumference of the target shaft 8, a driven wheel mounting part 83, a bearing sealing part 84, and a coupling mounting part 85 are sequentially arranged from the transmission end to the target disk assembly end.

[0083] A converter 11 is arranged at the end of the transmission end of the target shaft 5. Two coaxially arranged water passing cavities 12 are arranged on the converter 11. The two water passing cavities 12 are respectively communicated with the liquid inlet channel 81 and the liquid outlet channel 82 inside the target shaft 8 and are connected to an external liquid inlet pipe and an external liquid outlet pipe.

[0084] The driven wheel 63 is mounted on the driven wheel mounting part 83, the magnetic fluid seal assembly 9 is mounted on the bearing sealing part 84, and the coupling 10 is mounted on the coupling mounting part 85.

[0085] At the end of the end of the target shaft 8 where the coupling 10 is provided, a liquid diverter 13 is arranged. The liquid diverter 13 includes a diverter water inlet body 14 and a diverter water outlet body 15.

[0086] The shunt water inlet body 14 is provided with a water inlet cavity 141 and a plurality of water inlet nozzles 142 communicating with the water inlet cavity 141. The shunt water outlet body 15 is provided with a water outlet cavity 151 and a plurality of water outlet nozzles 152 communicating with the water outlet cavity 151. The water inlet cavity 141 communicates with the liquid inlet channel 81, and the water outlet cavity 151 communicates with the liquid outlet channel 82.

[0087] The target disk assembly 7 includes a target disk base 71 and a target disk 72 movably clamped to the target disk base 71 by a plurality of clamping assemblies 73.

[0088] The target disk 72 includes a cooling layer 75 and a target layer 76. The target layer 76 includes a plurality of target layer pieces 761 evenly distributed and arranged in a fan shape. The plurality of target layer pieces 761 enclose to form the target layer, and the target layer 76 is attached to the cooling layer 75. A plurality of cooling channels 751 are arranged inside the cooling layer 75.

[0089] The target layer piece 761 is provided with a target piece connection seat 762, and the target piece connection seat 762 is provided with a connection pin hole 763. A plurality of capillary cooling channels 764 are arranged on the target layer piece 761. The capillary cooling channels 764 communicate with the cooling channels 751 and are used to directly cool the target layer piece 761. The capillary cooling channels 764 and the cooling channels 751 form a part of the target disk cooling channel.

[0090] A capillary cooling channel inlet 765 and a capillary cooling channel outlet 766 are arranged on the target layer piece 761.

[0091] The capillary cooling channel 764 adopts a three-dimensional space flow cooling structure, that is, the capillary cooling channel 764 circulates on one side of the target layer piece to complete one channel and then penetrates to the other side to cool another capillary cooling channel 764 on the other side, and then penetrates back to the capillary cooling channel 764 on the previous side for cooling, and then cools the capillary cooling channel on the next side, and circulates reciprocally to complete the cooling of the entire target layer piece 761 and then returns from the capillary cooling channel outlet 766.

[0092] The clamping assembly 73 includes a rotating seat 731 arranged on the side surface of the target disk base 71, a clamping hook 732 arranged on the rotating seat 731, and an electromagnet 733. The clamping hook 732 is rotatably arranged on the rotating seat 731. A sliding groove 734 is arranged on the clamping hook 732, a push rod 735 is arranged on the electromagnet 733, and the push rod 735 is inserted into the sliding groove 734 and can move along the sliding groove 734.

[0093] The described target disk base 71 includes an integrally provided base inner ring 711, a base outer ring 712, and several rib strips 713 connecting the base inner ring 711 and the base outer ring 712. A coupling connection hole 714 is provided on the end face of the base inner ring 711, and the end face of the coupling 10 is fixedly connected to the base inner ring 711 through a connecting member disposed inside the coupling connection hole 714. Several inner ring cooling holes 715 are provided on the inner ring surface of the base inner ring 711, outer ring cooling holes 716 are provided on the outer ring surface of the base outer ring 712, and a rib strip cooling channel 717 communicating the inner ring cooling holes 715 and the outer ring cooling holes 716 is provided inside the rib strip 713. The inner ring cooling holes 715 are directly communicated with the water inlet nozzle 142 and the water outlet nozzle 152.

[0094] The rib strip cooling channel 717 includes a rib strip cooling channel inlet 717-1 and a rib strip cooling channel outlet 717-2. The inner ring cooling holes 715, the outer ring cooling holes 716, and the rib strip cooling channel 717 form the target disk base cooling channel. The target disk base cooling channel forms a part of the target disk cooling channel. The inner ring cooling holes 715, the outer ring cooling holes 716, the rib strip cooling channel 717, the cooling flow channel 751, and the capillary cooling channel 764 together form the target disk cooling channel.

[0095] The rib strip cooling channel inlet 717-1 is communicated with the capillary cooling channel inlet 765, and the rib strip cooling channel outlet 717-2 is communicated with the capillary cooling channel outlet 766.

[0096] The cooling circulation path of the rotating part 4 includes the cooling medium inside the external liquid inlet pipe entering the liquid inlet channel 81 inside the target shaft 8 from the water passing cavity 12 inside the adapter, entering the water inlet cavity 141 on the water distributor inlet body 14 and being sprayed through the water inlet nozzle 142 into the rib strip cooling channel inlet 717-1, entering the cooling flow channel 751, then entering the capillary cooling channel 764 through the capillary cooling channel inlet 765 for three-dimensional space circulation cooling, then flowing back to the cooling flow channel 751 through the capillary cooling channel outlet 766, flowing through the rib strip cooling channel outlet 717-2 and the inner ring cooling holes 715, returning to the water outlet nozzle 152, then flowing through the water outlet cavity 151 and the liquid outlet channel 82, flowing back to the water passing cavity 12, and finally flowing back to the external liquid outlet pipe through the water passing cavity 12 to achieve reciprocating cycle cooling.

[0097] In this embodiment, liquid nitrogen is used as the cooling medium.

[0098] Several positioning holes are further provided on the ring surface of the base outer ring 712, and a pin shaft 718 is provided inside the positioning holes. The pin shaft 718 is used for positioning the target disk. Several magnet positioning grooves 719 are further provided on the ring surface of the base outer ring 712, and the electromagnet 733 is fixed inside the magnet positioning grooves 719 through a positioning pin.

[0099] The described target disk 72 is arranged on the outer ring surface of the target disk base 71, and the target layer sheet 761 and the positioning holes on the base outer ring 712 are positioned by a pin shaft 718.

[0100] The described clamping component 73 is arranged on the side of the target disk base 71 facing the coupling 10. Specifically, the rotating seat 731 is fixed on the base outer ring 712, and the catch 732 is clamped on the target piece connecting seat 762 to realize the clamping and positioning of the target layer sheet 761. At this time, an electromagnet 733 is arranged at the lower part of the clamping part of the target layer sheet 761 and the catch 732, that is, the target layer sheet 761 is pressed on the electromagnet 733.

[0101] The described vacuum cavity 2 includes a target disk cavity 21 and an installation cavity 22. The coupling 10 and the target disk assembly 7 are arranged inside the target disk cavity 21. The magneto - hydrodynamic sealing component 9 is matched with the installation cavity 22 to realize a sealed drive connection, and the drive end of the target shaft 8 is arranged outside the installation cavity 22.

[0102] During use, the target shaft 8, as a part of the vacuum cavity 2, can be used to remove the rotating part 4 and the vacuum cavity 2 together from the treatment device main body 100 for replacement, realizing a quick target replacement operation. Since the vacuum cavity 2 and the rotating part 4 are arranged together and replaced together, the sealing problem and the radiation problem during the target replacement process are solved.

[0103] The rotating target for boron neutron capture therapy described in the above - mentioned embodiment realizes effective cooling of the target layer through reasonable design of the internal cooling circulation path of the rotating target. At the same time, the rotating part and the vacuum cavity are set as an integral replacement structure, which greatly saves the target replacement time. Moreover, the overall replacement reduces the radiation risk. At the same time, the target layer sheet can be replaced separately, realizing the effective utilization of the rotating target.

[0104] Since the target layer is generally made of lithium material, and lithium has a relatively low melting point of 180 °C and a medium thermal conductivity of 85 W / mK. If the energy of the proton beam, which is dissipated as heat in the target and not fully removed, the target will be damaged.

[0105] At the same time, the strong proton beam can quickly cause foaming and other damages to the target material, thus affecting the service life of the target and requiring frequent target replacement. Frequent target replacement has many problems such as complex operation, inability to ensure sealing, and inconvenient disassembly with radiation.

[0106] In this application, in order to avoid damage to the target or frequent replacement of the target, first, a cooling channel is provided inside the rotating target, and cooling treatment is achieved by introducing a cooling medium. Second, through the integrated replacement design of the rotating part and the vacuum chamber, the damaged target part and the vacuum chamber can be replaced together, which is convenient and fast. Moreover, the replaced target part can be replaced separately for the target layer piece at the damaged part during the repair process, greatly saving the target material and reducing the cost.

[0107] The above specific embodiments are specific embodiments of the present invention, which are used to illustrate the concept of the present invention and are all explanatory and exemplary, and should not be construed as limiting the embodiments of the present invention and the scope of the present invention. Except for the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the content disclosed in the claims and the specification of this application. These technical solutions include technical solutions that make any obvious substitutions and modifications to the embodiments described herein, and are all within the protection scope of the present invention.

Claims

1. A rotating target for boron neutron capture therapy, comprising a rotating target assembly (1) used in cooperation with a vacuum cavity (2), characterized in that: The described rotary target assembly (1) and the vacuum chamber (2) are provided in an integrated replaceable manner. A replaceable target layer sheet (761) is provided in the rotary target assembly (1), and a target cooling channel is provided in the rotary target assembly (1).

2. The rotating target for boron neutron capture therapy according to claim 1, characterized in that: The rotary target assembly (1) includes a target shaft (8) and a target disc assembly (7). The target disc assembly (7) is arranged inside the vacuum chamber (2), and the target shaft (8) and the vacuum chamber (2) form a vacuum sealing structure through a group of magneto - hydrodynamic sealing assemblies (9).

3. The rotating target for boron neutron capture therapy according to claim 2, characterized in that: The target disc assembly (7) is connected to one end of the target shaft (8) extending into the vacuum chamber through a coupling (10).

4. The rotating target for boron neutron capture therapy according to claim 2, characterized in that: The target cooling channel includes a target shaft cooling channel (300) and a target disc cooling channel (200). The target shaft cooling channel (300) includes a liquid inlet channel (81) and a liquid outlet channel (82) provided inside the target shaft. The target disc cooling channel (200) includes a target disc liquid inlet channel and a target disc liquid outlet channel provided inside the target disc.

5. The rotating target for boron neutron capture therapy according to claim 4, wherein: The target disc assembly (7) includes a target disc base (71) and a target disc (72) movably clamped to the target disc base (71) through a plurality of clamping assemblies (73).

6. The rotating target for boron neutron capture therapy according to claim 5, wherein: The target disc (72) includes a cooling layer (75) and a target layer (76). The target layer (76) is formed by enclosing a plurality of replaceable target layer sheets (761), and the target layer (76) is attached to the cooling layer (75).

7. The rotating target for boron neutron capture therapy according to claim 6, wherein: A plurality of cooling channels (751) are provided inside the cooling layer (75); a plurality of capillary cooling channels (764) communicating with the cooling channels (751) are provided on the target layer sheet (761); the capillary cooling channels (764) and the cooling channels (751) form a part of the target disc cooling channel.

8. The rotating target for boron neutron capture therapy according to claim 7, characterized in that: The capillary cooling channel (764) has a planar folding - back circulation structure; or the capillary cooling channel (764) has a three - dimensional space - flowing cooling structure.

9. The rotating target for boron neutron capture therapy according to claim 7, wherein: A capillary cooling channel inlet (765) and a capillary cooling channel outlet (766) communicating with the capillary cooling channel (764) are provided on the target layer sheet (761).

10. The rotating target for boron neutron capture therapy according to claim 5, characterized in that: A target disc base cooling channel is provided inside the target disc base (71), and the target disc base cooling channel forms a part of the target disc cooling channel.

11. The rotating target for boron neutron capture therapy according to claim 5, characterized in that: The clamping assembly (73) includes a rotating seat (731) provided on the target disc base (71) and a hook (732) provided on the rotating seat (731). A sliding groove (734) is provided on the hook. An electromagnet (733) is provided on the target disc base (71) corresponding to the hook (732), and a push rod (735) is provided on the electromagnet (733). The push rod (735) is inserted into the sliding groove (734) and can move along the sliding groove (734).

12. The rotating target for boron neutron capture therapy according to any one of claims 2 to 11, characterized in that: A conversion part (11) is provided at one end of the target shaft (8), and a liquid diverter (13) is provided at the other end of the target shaft (8).

13. The rotating target for boron neutron capture therapy according to any one of claims 1 to 11, characterized in that: A target sheet connecting seat (762) is provided on the target layer sheet (761), and a connecting pin hole (763) is provided on the target sheet connecting seat (762).

14. The rotating target for boron neutron capture therapy according to any one of claims 1 to 11, characterized in that: The rotary target assembly (1) further includes a power source (5) and a transmission assembly (6).

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