Multi-leaf collimator, radiotherapy device and control method

Abstract

This application provides a multi-leaf collimator, a radiotherapy device, and a control method. The multi-leaf collimator includes a mounting base, a first leaf frame and a second leaf frame slidably connected to the mounting base, a first leaf group slidably connected to the first leaf frame, a second leaf group slidably connected to the second leaf frame, a first movable shielding assembly located in the first leaf frame, a second movable shielding assembly located in the second leaf frame, and a fixed shielding assembly fixed to the mounting base. The first movable shielding assembly includes a first shielding block and a second shielding block separated on both sides of the first leaf group. The second movable shielding assembly includes a third shielding block and a fourth shielding block separated on both sides of the second leaf group. The fixed shielding assembly includes a first fixed block and a second fixed block, with the first fixed block slidably connected between the first and third shielding blocks, and the second fixed block slidably connected between the second and fourth shielding blocks. The multi-leaf collimator provided by this application can prevent radiation leakage and improve the therapeutic effect of the radiotherapy device.

Description

Technical Field

[0001] This application relates to the field of radiotherapy equipment technology, and in particular to a multi-leaf grating, radiotherapy equipment, and control method. Background Technology

[0002] Radiotherapy equipment is a local treatment device that uses beams of radiation to irradiate tumors to treat cancer. The multi-leaf collimator (MLC) is the core component of radiotherapy equipment. The MLC controls the movement of its leaflets to create an irregular radiation field based on the shape of the patient's tumor, allowing the radiation beam to pass directly to the tumor lesion and thus avoiding damage to the patient's normal tissues. However, in related technologies, radiation leakage can occur during the operation of the MLC, leading to damage to the patient's normal tissues and resulting in poor treatment efficacy. Summary of the Invention

[0003] In view of this, this application provides a multi-leaf grating, a radiotherapy device, and a control method that can prevent radiation leakage, protect the patient's normal tissues, and improve the therapeutic effect of the radiotherapy device.

[0004] Specifically, this application is implemented through the following technical solution: According to a first aspect of the embodiments of this application, a multi-leaf grating is provided, including a mounting base, a first leaf frame, a second leaf frame, a first leaf group, a second leaf group, a first movable shielding assembly, a second movable shielding assembly, and a fixed shielding assembly. The first leaf frame is slidably connected to the mounting base and has a first leaf cavity. The second leaf frame is slidably connected to the mounting base and disposed opposite to the first leaf frame, and the second leaf frame has a second leaf cavity. The first leaf group is slidably disposed in the first leaf cavity. The second leaf group is slidably disposed in the second leaf cavity. The first movable shielding assembly includes a first shielding block and a second shielding block, which are respectively protruding from the side of the first leaf frame facing the second leaf frame, and are separated on both sides of the first leaf group along the width direction of the first leaf frame. The second movable shielding assembly includes a third shielding block and a fourth shielding block, which are respectively protruding from the side of the second leaf frame facing the first leaf frame, and are separated on both sides of the second leaf group along the width direction of the second leaf frame. The fixed shielding assembly includes a first fixing block and a second fixing block respectively fixed to the mounting base. The first fixing block is slidably connected between the first shielding block and the third shielding block, and the second fixing block is slidably connected between the second shielding block and the fourth shielding block.

[0005] The technical solutions provided by the embodiments of this application may include the following beneficial effects: In use, the multi-leaf grating provided in this application maintains a stationary state by keeping the first and second fixing blocks fixed to the mounting base as the first and second leaf frames move closer or further apart. The first and second shielding blocks on the first leaf frame move with it, as do the third and fourth shielding blocks on the second leaf frame. This allows the first and third shielding blocks to slide along the first fixing block to move closer or further apart, and the second and fourth shielding blocks to slide along the second fixing block to move closer or further apart. This configuration ensures that regardless of the position of the first and second leaf frames, the first and second shielding blocks on the first leaf frame always block radiation leakage from the left and right sides of the first leaf assembly, and the third and fourth shielding blocks on the second leaf frame always block radiation leakage from the left and right sides of the second leaf assembly, enabling dynamic following shielding for both the first and second moving shielding components. Meanwhile, during the movement of the first blade frame and the second blade frame, the first fixed block can always be connected between the first shielding block and the third shielding block to fill the movement gap, and the second fixed block can always be connected between the second shielding block and the fourth shielding block to fill the movement gap, so that the left and right sides of the first blade group and the second blade group can form an uninterrupted shielding barrier, thereby further effectively blocking the radiation that may leak from the movement gap between the two moving shielding components.

[0006] Therefore, for the multi-leaf grating provided in this application, regardless of the position of the first and second leaf frames, this application can form a continuous shielding barrier by combining the use of each moving shielding component and the fixed shielding component to shield the outward scattering rays from the side of each leaf group, improve the beam collimation accuracy of the multi-leaf grating, protect the normal tissues of the patient located outside the tumor target area, and improve the treatment effect of the radiotherapy equipment.

[0007] The technical solution of this application will be further described below.

[0008] In one embodiment, the first shielding block has a first inclined surface that slides and fits into the first blade group, the second shielding block has a second inclined surface that slides and fits into the first blade group, and the inclination direction of the first inclined surface is opposite to the inclination direction of the second inclined surface. The third shielding block has a third inclined surface that slides and fits into the second blade group, and the fourth shielding block has a fourth inclined surface that slides and fits into the second blade group, and the inclination direction of the third inclined surface is opposite to the inclination direction of the fourth inclined surface.

[0009] In one embodiment, the first fixing block is provided with a first clearance groove, and the first shielding block and the third shielding block are slidably connected to the first clearance groove. The second fixing block is provided with a second clearance groove, and the second shielding block and the fourth shielding block are slidably connected to the second clearance groove.

[0010] In one embodiment, a first clearance groove is disposed on the side of the first fixing block facing the second fixing block, and a second clearance groove is disposed on the side of the second fixing block facing the first fixing block.

[0011] In one embodiment, along the height direction of the first blade frame, the cross sections of the first shielding block, the second shielding block, the third shielding block and the fourth shielding block are right-angled trapezoids, and the first clearance groove and the second clearance groove are L-shaped grooves adapted to the right-angled trapezoids.

[0012] In one embodiment, the first fixing block has a first mating inclined surface on the side facing the second fixing block, and a first clearance groove is located between the mounting base and the first mating inclined surface. The inclination direction of the first mating inclined surface is the same as the inclination direction of the first inclined surface and the third inclined surface. The second fixing block has a second mating inclined surface on the side facing the first fixing block, and a second clearance groove is located between the mounting base and the second mating inclined surface. The inclination direction of the second mating inclined surface is the same as the inclination direction of the second inclined surface and the fourth inclined surface.

[0013] In one embodiment, the first shielding block has a first movable groove, the third shielding block has a first mating groove communicating with the first movable groove, and the end of the first fixing block near the first shielding block is slidably disposed in the first movable groove, and the end of the first fixing block near the third shielding block is slidably disposed in the first mating groove. The second shielding block has a second movable groove, the fourth shielding block has a second mating groove communicating with the second movable groove, the end of the second fixing block near the second shielding block is slidably disposed in the second movable groove, and the end of the second fixing block near the fourth shielding block is slidably disposed in the second mating groove.

[0014] In one embodiment, a first movable groove is disposed on the side of the first shielding block facing away from the first inclined surface, and a first mating groove is disposed on the side of the third shielding block facing away from the third inclined surface. A second movable groove is disposed on the side of the second shielding block facing away from the second inclined surface, and a second mating groove is disposed on the side of the fourth shielding block facing away from the fourth inclined surface.

[0015] In one embodiment, the material of the first dynamic shielding component includes one of tungsten and tungsten alloys, molybdenum and molybdenum alloys, and lead and lead alloys.

[0016] In one embodiment, the material of the second dynamic shielding component includes one of tungsten and tungsten alloys, molybdenum and molybdenum alloys, and lead and lead alloys.

[0017] In one embodiment, the material of the fixed shielding component includes one of tungsten and tungsten alloys, molybdenum and molybdenum alloys, and lead and lead alloys.

[0018] In one embodiment, the first shielding block and the second shielding block are integrally formed with or detachably connected to the first blade frame.

[0019] In one embodiment, the third shielding block and the fourth shielding block are integrally formed with the second blade frame or detachably connected.

[0020] In one embodiment, the first fixing block and the second fixing block are integrally formed with the mounting base or detachably connected to it.

[0021] In one embodiment, the first blade cavity has a first upper cavity and a first lower cavity separated along the height direction of the first blade frame. The first blade group includes a first upper blade slidably disposed in the first upper cavity and a first lower blade slidably disposed in the first lower cavity. At least one of the first upper blade and the first lower blade is slidably attached between the first shielding block and the second shielding block. The second blade cavity has a second upper cavity and a second lower cavity separated along the height direction of the second blade frame. The second blade group includes a second upper blade slidably disposed in the second upper cavity and a second lower blade slidably disposed in the second lower cavity. At least one of the second upper blade and the second lower blade is slidably attached between the third shielding block and the fourth shielding block.

[0022] In one embodiment, the first shielding block and the second shielding block each extend partially beyond the first upper blade in the direction from the first lower blade to the first upper blade.

[0023] In one embodiment, the third shielding block and the fourth shielding block each extend partially beyond the second upper blade in the direction from the second lower blade to the second upper blade.

[0024] According to a second aspect of the present application, a radiotherapy device is provided, including a drive assembly and a multi-leaf grating of any of the above embodiments. The drive assembly is connected to a mounting base and is drivenly connected to a first leaf frame and a second leaf frame, respectively, so that the first leaf frame and the second leaf frame can move closer to or further away from each other.

[0025] The technical solutions provided by the embodiments of this application may include the following beneficial effects: The radiotherapy device provided in this application utilizes the aforementioned multi-leaf grating. Regardless of the position of the first and second leaf frames, this application can form a continuous shielding barrier through the combined use of various moving shielding components and fixed shielding components to shield the outward scattering rays from the sides of each leaf group, thereby improving the beam collimation accuracy of the multi-leaf grating, protecting the normal tissues of the patient located outside the tumor target area, and improving the therapeutic effect of the radiotherapy device.

[0026] According to a third aspect of the embodiments of this application, a control method for a radiotherapy device is provided. The radiotherapy device includes the aforementioned radiotherapy device. The method includes: controlling a drive component to move a first blade frame and a second blade frame closer together, causing a first shielding block and a third shielding block to slide along a first fixed block to move closer together, and causing a second shielding block and a fourth shielding block to slide along a second fixed block to move closer together. And / or, controlling the drive component to move the first blade frame and the second blade frame further apart, causing the first shielding block and the third shielding block to slide along the first fixed block to move further apart, and causing the second shielding block and the fourth shielding block to slide along the second fixed block to move further apart.

[0027] The technical solutions provided by the embodiments of this application may include the following beneficial effects: In the radiotherapy equipment control method provided in this application, regardless of the position of the first and second leaf frames, this application can form a continuous shielding barrier by combining the use of each moving shielding component and the fixed shielding component to shield the outward scattering rays from the side of each leaf group, improve the beam collimation accuracy of the multi-leaf grating, protect the normal tissues of the patient located outside the tumor target area, and improve the treatment effect of the radiotherapy equipment.

[0028] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0029] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application.

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a multileaf grating provided in one embodiment of the present application.

[0032] Figure 2 for Figure 1 The image shows a bottom view of a multileaf grating.

[0033] Figure 3 for Figure 2 The diagram shows the internal structure of a multileaf grating.

[0034] Figure 4 This is a schematic diagram of the structure of the first blade frame provided in one embodiment of the present application.

[0035] Figure 5 This is a schematic diagram of the structure of the first shielding block provided in one embodiment of the present application.

[0036] Figure 6 This is a schematic diagram of the structure of the first fixing block provided in one embodiment of the present application.

[0037] Figure 7 This is a schematic diagram of the structure of the second blade frame provided in one embodiment of this application.

[0038] Figure 8 This is a schematic diagram of the structure of a radiotherapy device provided in one embodiment of this application.

[0039] Figure 9 for Figure 8 The diagram shows the structure of the radiotherapy device from another perspective.

[0040] Figure 10 A schematic diagram of the internal structure of the radiotherapy device provided in this application, which includes a collimator and a radiation source.

[0041] Figure label: 1-Radiotherapy equipment; 11-Multi-leaf grating; 111-Mounting base; 112-First leaf frame; 1121-First leaf cavity; 1121a-First upper cavity; 1121b-First lower cavity; 113-Second leaf frame; 1131-Second leaf cavity; 1131a-Second upper cavity; 1131b-Second lower cavity; 114-First leaf assembly; 1141-First upper leaf; 1142-First lower leaf; 115-Second leaf assembly; 1151-Second upper leaf; 1152-Second lower leaf; 116-First dynamic shielding assembly; 1161-First shielding block; 1161a-First inclined plane ; 1161b - First connecting hole; 1162 - Second shielding block; 1162a - Second inclined surface; 117 - Second moving shielding assembly; 1171 - Third shielding block; 1171a - Third inclined surface; 1172 - Fourth shielding block; 1172a - Fourth inclined surface; 118 - Fixed shielding assembly; 1181 - First fixing block; 1181a - First clearance groove; 1181b - First mating inclined surface; 1181c - Second connecting hole; 1182 - Second fixing block; 1182b - Second mating inclined surface; 12 - Drive assembly; 13 - First collimator; 14 - Second collimator; 15 - Radiation source; 151 - Radiation. Detailed Implementation

[0042] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0043] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, height, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures). If the specific posture changes, the directional indications or positional relationships will also change accordingly.

[0044] Radiotherapy equipment is a local treatment device that uses beams of radiation to irradiate tumors to treat cancer. The multi-leaf collimator (MLC) is the core component of radiotherapy equipment. The MLC controls the movement of its leaflets to create an irregular radiation field based on the shape of the patient's tumor, allowing the radiation beam to pass directly to the tumor lesion and thus avoiding damage to the patient's normal tissues. However, in related technologies, radiation leakage can occur during the operation of the MLC, leading to damage to the patient's normal tissues and resulting in poor treatment efficacy.

[0045] Based on this, this application provides a multi-leaf grating that can prevent radiation leakage, thereby protecting the patient's normal tissues and improving the therapeutic effect of radiotherapy equipment.

[0046] See Figures 1 to 3According to a first aspect of the embodiments of this application, a multi-leaf grating 11 is provided, including a mounting base 111, a first leaf frame 112, a second leaf frame 113, a first leaf group 114, a second leaf group 115, a first movable shielding assembly 116, a second movable shielding assembly 117, and a fixed shielding assembly 118. The first leaf frame 112 is slidably connected to the mounting base 111 and has a first leaf cavity 1121. The second leaf frame 113 is slidably connected to the mounting base 111 and is disposed opposite to the first leaf frame 112, and the second leaf frame 113 has a second leaf cavity 1131. The first leaf group 114 is slidably disposed in the first leaf cavity 1121. The second leaf group 115 is slidably disposed in the second leaf cavity 1131. The first dynamic shielding assembly 116 includes a first shielding block 1161 and a second shielding block 1162. The first shielding block 1161 and the second shielding block 1162 are respectively protruding from the side of the first blade frame 112 facing the second blade frame 113, and the first shielding block 1161 and the second shielding block 1162 are separated on both sides of the first blade group 114 along the width direction of the first blade frame 112. The second dynamic shielding assembly 117 includes a third shielding block 1171 and a fourth shielding block 1172. The third shielding block 1171 and the fourth shielding block 1172 are respectively protruding from the side of the second blade frame 113 facing the first blade frame 112, and the third shielding block 1171 and the fourth shielding block 1172 are separated on both sides of the second blade group 115 along the width direction of the second blade frame 113. The fixed shielding assembly 118 includes a first fixing block 1181 and a second fixing block 1182 respectively fixed to the mounting base 111. The first fixing block 1181 is slidably connected between the first shielding block 1161 and the third shielding block 1171, and the second fixing block 1182 is slidably connected between the second shielding block 1162 and the fourth shielding block 1172.

[0047] It should be noted that the multi-leaf grating 11 is a beam shaping device used in radiotherapy equipment 1 (such as a linear accelerator). The multi-leaf grating 11 can form a radiation field that matches the shape of the tumor target area by utilizing the movement of the leaves, so as to treat the tumor and avoid damage to normal tissue. The mounting base 111 is the base of the multi-leaf grating 11 and can be used to support the various moving parts of the multi-leaf grating 11. For example, the first leaf frame 112 and the second leaf frame 113 can be slidably connected to the mounting base 111 respectively, so that the first leaf frame 112 and the second leaf frame 113 can move closer or further away from each other, so that the multi-leaf grating 11 can obtain a large radiation field. The first leaf frame 112 and the second leaf frame 113 can be arranged opposite each other in the front-back direction in the figure. The first leaf frame 112 and the second leaf frame 113 can be driven independently by drive components 12 such as linear motors, cylinders, hydraulic cylinders or lead screw mechanisms, etc., which are not limited in this application. Understandably, the length direction of the first blade frame 112 and the length direction of the second blade frame 113 can be set along the front-back direction in the figure, the width direction of the first blade frame 112 and the width direction of the second blade frame 113 can be set along the left-right direction in the figure, and the height direction of the first blade frame 112 and the height direction of the second blade frame 113 can be set along the up-down direction in the figure.

[0048] The first blade group 114 and the second blade group 115 each contain multiple blades, each of which can slide independently. The first blade group 114 is slidably mounted within the first blade cavity 1121 of the first blade frame 112, and the second blade group 115 is slidably mounted within the second blade cavity 1131 of the second blade frame 113. The first blade group 114 and the second blade group 115 can also move closer to or further away from each other to form an adjustable radiation field according to the shape of the tumor. Understandably, the sliding directions of the first blade group 114 and the second blade group 115 are respectively set along the front-back direction shown in the figure.

[0049] The first shielding block 1161 and the second shielding block 1162 of the first moving shielding assembly 116 are respectively fixedly protruding from the side of the first blade frame 112 facing the second blade frame 113, and the first shielding block 1161 and the second shielding block 1162 are respectively attached to the left and right sides of the first blade group 114 along the width direction of the first blade frame 112, so that the first shielding block 1161 and the second shielding block 1162 can move with the first blade frame 112 and block the radiation 151 from leaking from the left and right sides of the first blade group 114.

[0050] Similarly, the third shielding block 1171 and the fourth shielding block 1172 of the second moving shielding assembly 117 are respectively fixedly protruding from the side of the second blade frame 113 facing the first blade frame 112, and the third shielding block 1171 and the fourth shielding block 1172 are respectively attached to the left and right sides of the second blade group 115 along the width direction of the second blade frame 113, so that the third shielding block 1171 and the fourth shielding block 1172 can move with the second blade frame 113 and block the radiation 151 from leaking from the left and right sides of the second blade group 115.

[0051] The first fixing block 1181 and the second fixing block 1182 of the fixed shielding assembly 118 are respectively fixedly installed on the mounting base 111. The first fixing block 1181 is connected between the first shielding block 1161 and the third shielding block 1171, and the first fixing block 1181 slides in contact with the first shielding block 1161 and the third shielding block 1171 respectively, so that during the relative movement of the first blade frame 112 and the second blade frame 113, the first fixing block 1181 can always shield the gap between the first shielding block 1161 and the third shielding block 1171 to prevent the radiation 151 from leaking from the gap between the first shielding block 1161 and the third shielding block 1171. Similarly, the second fixing block 1182 is connected between the second shielding block 1162 and the fourth shielding block 1172, and the second fixing block 1182 slides in contact with the second shielding block 1162 and the fourth shielding block 1172 respectively, so that the second fixing block 1182 can also prevent the radiation 151 from leaking from the gap between the second shielding block 1162 and the fourth shielding block 1172.

[0052] During use, the multi-leaf grating 11 provided in this application allows the control system of the radiotherapy device 1 to control and drive the first leaf frame 112 and the second leaf frame 113 to move relative to each other along the mounting base 111 to the target position according to the shape of the tumor target area. Simultaneously, the control system of the radiotherapy device 1 can drive each leaf in the first leaf group 114 to slide independently within the first leaf cavity 1121, and drive each leaf in the second leaf group 115 to slide independently within the second leaf cavity 1131, so that the first leaf group 114 and the second leaf group 115 together form a radiation field shape consistent with the shape of the tumor target area for tumor treatment.

[0053] During this process, when the first blade frame 112 and the second blade frame 113 move closer or further away from each other, the first fixing block 1181 and the second fixing block 1182 are always fixed to the mounting base 111 and remain stationary. The first shielding block 1161 and the second shielding block 1162 on the first blade frame 112 can move with the first blade frame 112, and the third shielding block 1171 and the fourth shielding block 1172 on the second blade frame 113 can move with the second blade frame 113, so that the first shielding block 1161 and the third shielding block 1171 slide along the first fixing block 1181 to move closer or further away from each other, and the second shielding block 1162 and the fourth shielding block 1172 slide along the second fixing block 1182 to move closer or further away from each other. With this configuration, no matter where the first blade frame 112 and the second blade frame 113 move, the first shielding block 1161 and the second shielding block 1162 on the first blade frame 112 can always block the radiation 151 from leaking from the left and right sides of the first blade group 114, and the third shielding block 1171 and the fourth shielding block 1172 on the second blade frame 113 can always block the radiation 151 from leaking from the left and right sides of the second blade group 115, so that the first moving shielding assembly 116 and the second moving shielding assembly 117 can achieve dynamic following shielding. Meanwhile, during the movement of the first blade frame 112 and the second blade frame 113, even if the gap between the first shielding block 1161 and the third shielding block 1171 changes, and the gap between the second shielding block 1162 and the fourth shielding block 1172 changes, the first fixing block 1181 can always be connected between the first shielding block 1161 and the third shielding block 1171 to fill the movement gap, and the second fixing block 1182 can always be connected between the second shielding block 1162 and the fourth shielding block 1172 to fill the movement gap, so that the left and right sides of the first blade group 114 and the second blade group 115 can form an uninterrupted shielding barrier, thereby further effectively blocking the radiation 151 that may leak from the movement gap between the two moving shielding components.

[0054] Therefore, when the multi-leaf grating 11 provided in this application is used, no matter where the first leaf frame 112 and the second leaf frame 113 move, this application can form a continuous shielding barrier by combining the dynamic shielding components and the fixed shielding components 118 to shield the outward scattering rays 151 from the sides of each leaf group, improve the beam collimation accuracy of the multi-leaf grating 11, protect the normal tissues of the patient located outside the tumor target area, and improve the treatment effect of the radiotherapy device 1.

[0055] See Figures 3 to 6In one embodiment, the first shielding block 1161 has a first inclined surface 1161a that slides and fits against the first blade group 114, and the second shielding block 1162 has a second inclined surface 1162a that slides and fits against the first blade group 114. The inclination direction of the first inclined surface 1161a is opposite to the inclination direction of the second inclined surface 1162a. The third shielding block 1171 has a third inclined surface 1171a that slides and fits against the second blade group 115, and the fourth shielding block 1172 has a fourth inclined surface 1172a that slides and fits against the second blade group 115. The inclination direction of the third inclined surface 1171a is opposite to the inclination direction of the fourth inclined surface 1172a.

[0056] It should be noted that, to prevent radiation 151 from leaking through the gaps between the blades in the first blade group 114, the cross-section of each blade in the first blade group 114 is typically set as a trapezoid, narrower at the top and wider at the bottom. This design allows the inclined surfaces of adjacent blades to fit together when the blades in the first blade group 114 are closely arranged in the left-right direction, thus blocking radiation 151 leakage. Therefore, this application provides a first inclined surface 1161a that slides and fits against the first blade group 114 in the first shielding block 1161, and a second inclined surface 1162a that slides and fits against the first blade group 114 in the second shielding block 1162, so that the first inclined surface 1161a and the second inclined surface 1162a can fit against the left and right sides of the first blade group 114, thereby further preventing radiation 151 leakage. Similarly, this application provides a third inclined surface 1171a that slides and fits against the second blade group 115 in the third shielding block 1171, and a fourth inclined surface 1172a that slides and fits against the second blade group 115 in the fourth shielding block 1172, so that the third inclined surface 1171a and the fourth inclined surface 1172a can fit against the left and right sides of the second blade group 115, thereby further preventing the leakage of radiation 151.

[0057] As an example, in the figure, from top to bottom, the first inclined plane 1161a and the third inclined plane 1171a are inclined from right to left, respectively, and the second inclined plane 1162a and the fourth inclined plane 1172a are inclined from left to right, respectively.

[0058] Furthermore, during the sliding process of each blade, the first inclined surface 1161a and the second inclined surface 1162a are always in contact with the left and right sides of the first blade group 114, and the third inclined surface 1171a and the fourth inclined surface 1172a are always in contact with the left and right sides of the second blade group 115. When each blade of the first blade group 114 slides, since the inclination directions of the first inclined surface 1161a and the second inclined surface 1162a are opposite, the first inclined surface 1161a and the second inclined surface 1162a can respectively form component forces on both sides of the first blade group 114 to limit the sliding of the first blade group 114 between the first inclined surface 1161a and the second inclined surface 1162a, thereby reducing the sliding deviation of the first blade group 114. Similarly, when the blades of the second blade group 115 slide, since the inclination directions of the third inclined surface 1171a and the fourth inclined surface 1172a are opposite, the third inclined surface 1171a and the fourth inclined surface 1172a can also form component forces on both sides of the second blade group 115 respectively, so as to restrict the second blade group 115 from sliding between the third inclined surface 1171a and the fourth inclined surface 1172a, thereby reducing the sliding offset of the second blade group 115.

[0059] See Figures 3 to 6 In one embodiment, the first fixing block 1181 is provided with a first clearance groove 1181a, and the first shielding block 1161 and the third shielding block 1171 are slidably connected to the first clearance groove 1181a. The second fixing block 1182 is provided with a second clearance groove, and the second shielding block 1162 and the fourth shielding block 1172 are slidably connected to the second clearance groove.

[0060] With this configuration, when the first blade frame 112 and the second blade frame 113 move closer or further apart, the first shielding block 1161 and the third shielding block 1171 can slide within the first clearance groove 1181a, and the second shielding block 1162 and the fourth shielding block 1172 can slide within the second clearance groove. This utilizes the first clearance groove 1181a and the second clearance groove to provide sliding guidance for each shielding block, while also increasing the connection area between each shielding block and its corresponding fixed block. This prevents each shielding block from detaching from its corresponding fixed block, thereby avoiding breaks in the continuous shielding barrier.

[0061] Furthermore, along the top-to-bottom direction in the figure, the first clearance groove 1181a can also form tortuous embedding surfaces between the first shielding block 1161 and the first fixing block 1181, and between the third shielding block 1171 and the first fixing block 1181, respectively. Similarly, the second clearance groove can also form tortuous embedding surfaces between the second shielding block 1162 and the second fixing block 1182, and between the fourth shielding block 1172 and the second fixing block 1182, respectively. With this configuration, when the ray 151 strikes the first fixing block 1181 and the second fixing block 1182, the tortuous embedding surfaces can extend the leakage path, thereby increasing the number of reflections and refractions of the ray 151 and reducing the leakage of the ray 151.

[0062] See Figures 3 to 6 In one embodiment, a first clearance groove 1181a is disposed on the side of the first fixing block 1181 facing the second fixing block 1182, and a second clearance groove is disposed on the side of the second fixing block 1182 facing the first fixing block 1181. This arrangement is equivalent to the first shielding block 1161 and the second shielding block 1162 being located between the first fixing block 1181 and the second fixing block 1182, and the third shielding block 1171 and the fourth shielding block 1172 also being located between the first fixing block 1181 and the second fixing block 1182. This allows the first fixing block 1181 and the second fixing block 1182 to respectively clamp and limit the shielding blocks, further preventing each shielding block from detaching from its corresponding fixing block, while also restricting each shielding block from swinging in the left-right direction as shown in the figure.

[0063] See Figures 3 to 6 In one embodiment, along the height direction of the first blade frame 112, the cross sections of the first shielding block 1161, the second shielding block 1162, the third shielding block 1171 and the fourth shielding block 1172 are right-angled trapezoids, and the first clearance groove 1181a and the second clearance groove are L-shaped grooves adapted to the right-angled trapezoids.

[0064] It should be noted that, since each shielding block is designed with a right-angled trapezoidal cross-section and each clearance groove is designed with an L-shaped groove, when each shielding block is embedded into its corresponding L-shaped groove, the right-angled side of each right-angled trapezoid can fit tightly against the right-angled inner wall of each L-shaped groove, and the inclined surface of each right-angled trapezoid can face the opening side of each L-shaped groove to fit against the corresponding blade assembly. With this configuration, as the first blade frame 112 and the second blade frame 113 move closer or further apart, the right-angled inner wall of each L-shaped groove can provide sliding guidance for each shielding block and limit the left-right swaying of each shielding block during sliding, thereby improving the alignment accuracy between the blade assemblies.

[0065] Furthermore, along the vertical direction shown in the figure, this application uses L-shaped grooves adapted to right-angled trapezoids for the first clearance groove 1181a and the second clearance groove, respectively. This allows the upward-facing side of the L-shaped groove to form an opening, thereby enabling the upward-facing side of each shielding block to be flush with the upward-facing side of each fixing block. This arrangement reduces the gap between the downward-facing side of the mounting base 111 and each shielding block, thus preventing the leakage of radiation 151.

[0066] See Figures 3 to 6 In one embodiment, the first fixing block 1181 has a first mating inclined surface 1181b on the side facing the second fixing block 1182, and a first clearance groove 1181a is located between the mounting base 111 and the first mating inclined surface 1181b. The inclination direction of the first mating inclined surface 1181b is the same as the inclination direction of the first inclined surface 1161a and the third inclined surface 1171a. The second fixing block 1182 has a second mating inclined surface 1182b on the side facing the first fixing block 1181, and a second clearance groove is located between the mounting base 111 and the second mating inclined surface 1182b. The inclination direction of the second mating inclined surface 1182b is the same as the inclination direction of the second inclined surface 1162a and the fourth inclined surface 1172a.

[0067] It should be noted that the radiation source 15 is typically positioned above the mounting base 111, and the rays 151 emitted by the radiation source 15 are typically divergent. This application further provides a first mating inclined surface 1181b on the first fixing block 1181, enabling the first inclined surface 1161a, the third inclined surface 1171a, and the first mating inclined surface 1181b to be coplanar, forming inclined surfaces with the same slope. With this configuration, when the rays 151 from the radiation source 15 are emitted from top to bottom, the rays 151 are guided and propagated along the coplanar inclined surfaces, rather than diffusing directly outwards. That is, the first mating inclined surface 1181b can further shield the rays 151 emitted along the first inclined surface 1161a and / or the third inclined surface 1171a, preventing the rays 151 from diffusing and leaking from the lower side of the first shielding block 1161 and the third shielding block 1171. Similarly, this application also provides a second mating inclined surface 1182b in the second fixing block 1182, which enables the second inclined surface 1162a, the fourth inclined surface 1172a and the second mating inclined surface 1182b to be coplanar. When the radiation 151 of the radiation source 15 is emitted from top to bottom, the second mating inclined surface 1182b can further shield the radiation 151 emitted along the second inclined surface 1162a and / or the fourth inclined surface 1172a, so as to prevent the radiation 151 from leaking from the lower side of the second shielding block 1162 and the fourth shielding block 1172.

[0068] Furthermore, the first mating inclined surface 1181b provided in this application for the first fixing block 1181 can also be used to reduce the volume of the first fixing block 1181, so as to avoid relative sliding of the first blade group 114 and the second blade group 115, and avoid motion interference between the first fixing block 1181 and the first blade group 114 and / or the second blade group 115. Similarly, the second mating inclined surface 1182b provided in this application for the second fixing block 1182 can also be used to reduce the volume of the second fixing block 1182, so as to avoid relative sliding of the first blade group 114 and the second blade group 115, and avoid motion interference between the second fixing block 1182 and the first blade group 114 and / or the second blade group 115.

[0069] In one embodiment, the first shielding block 1161 is provided with a first movable sliding groove, and the third shielding block 1171 is provided with a first mating groove communicating with the first movable sliding groove. The first fixing block 1181 is slidably disposed within the first movable sliding groove at one end near the first shielding block 1161, and the first fixing block 1181 is slidably disposed within the first mating groove at one end near the third shielding block 1171. The second shielding block 1162 is provided with a second movable sliding groove, and the fourth shielding block 1172 is provided with a second mating groove communicating with the second movable sliding groove. The second fixing block 1182 is slidably disposed within the second movable sliding groove at one end near the second shielding block 1162, and the second fixing block 1182 is slidably disposed within the second mating groove at one end near the fourth shielding block 1172.

[0070] With this configuration, this application can eliminate the need to create clearance grooves on each fixed block, and instead create sliding grooves on each corresponding shielding block to accommodate the sliding connection between each shielding block and each fixed block.

[0071] As an example, a first movable groove is disposed on the side of the first shielding block 1161 facing away from the first inclined surface 1161a, and a first mating groove is disposed on the side of the third shielding block 1171 facing away from the third inclined surface 1171a. A second movable groove is disposed on the side of the second shielding block 1162 facing away from the second inclined surface 1162a, and a second mating groove is disposed on the side of the fourth shielding block 1172 facing away from the fourth inclined surface 1172a.

[0072] With this configuration, the relative positions of the fixing blocks and the shielding blocks do not need to be changed; only the clearance grooves originally located on the fixing blocks need to be moved to the shielding blocks. Specifically, when the first blade frame 112 and the second blade frame 113 move closer or further apart, the first fixing block 1181 and the second fixing block 1182 remain fixed to the mounting base 111 and remain stationary, while the first shielding block 1161 and the third shielding block 1171 slide along the first fixing block 1181 to move closer or further apart, and the second shielding block 1162 and the fourth shielding block 1172 slide along the second fixing block 1182 to move closer or further apart. In other words, both ends of the first fixing block 1181 are respectively enclosed by the first shielding block 1161 and the third shielding block 1171, so that the first fixing block 1181 is constrained within the first and third movable sliding grooves. Similarly, the two ends of the second fixed block 1182 are respectively wrapped by the second shielding block 1162 and the fourth shielding block 1172, so that the second fixed block 1182 is constrained in the second moving slide groove and the fourth moving slide groove, thereby realizing the sliding fit between each shielding block and the corresponding fixed block, so as to prevent each shielding block from sliding off the corresponding fixed block.

[0073] In one embodiment, the material of the first dynamic shielding component 116 includes one of tungsten and tungsten alloys, molybdenum and molybdenum alloys, and lead and lead alloys. It should be noted that these materials all have high density, enabling them to effectively attenuate radiation 151, thereby improving the shielding effect. Furthermore, these materials also have high hardness and compressive strength, improving wear resistance during sliding contact with the blade components and preventing radiation 151 leakage due to gaps caused by wear between the shielding blocks. Simultaneously, these materials have high melting points and low coefficients of thermal expansion, ensuring good thermal stability of the shielding blocks under continuous high-dose-rate radiation 151 irradiation, thus preventing radiation 151 leakage due to thermal deformation. Additionally, these materials have weak magnetic properties and will not interfere with the magnetic field of the radiotherapy equipment 1.

[0074] In one embodiment, the material of the second dynamic shielding component 117 includes one of tungsten and tungsten alloys, molybdenum and molybdenum alloys, and lead and lead alloys. It should be noted that the material setting of the second dynamic shielding component 117 is the same as that of the first dynamic shielding component 116, and will not be described in detail here.

[0075] In one embodiment, the material of the fixed shielding component 118 includes one of tungsten and tungsten alloys, molybdenum and molybdenum alloys, and lead and lead alloys. It should be noted that the material setting of the fixed shielding component 118 is similar to that of the aforementioned dynamic shielding component, and will not be repeated here.

[0076] See Figures 3 to 6In one embodiment, the first shielding block 1161 and the second shielding block 1162 are integrally formed with the first blade frame 112 or are detachably connected.

[0077] As an example, this application integrally forms the first shielding block 1161 and the second shielding block 1162 with the first blade frame 112. This enables the first shielding block 1161, the second shielding block 1162 and the first blade frame 112 to form an integral rigid component. This not only enables the first blade frame 112 to have better structural strength during movement, so as to avoid vibration or displacement between the shielding blocks and the first blade frame 112, but also reduces the assembly steps of the first blade frame 112 and improves the assembly efficiency.

[0078] As an example, this application detachably connects the first shielding block 1161 and the second shielding block 1162 to the first blade frame 112, which facilitates individual replacement and maintenance of each shielding block, thereby reducing maintenance costs. Understandably, this application may provide at least one first connecting hole 1161b on the side of the first shielding block 1161 facing the second blade frame 113, allowing the first shielding block 1161 to be fixed to the first blade frame 112 by mounting bolts within the first connecting hole 1161b. Similarly, this application may provide at least one connecting hole on the side of the second shielding block 1162 facing the second blade frame 113, allowing the second shielding block 1162 to be fixed to the first blade frame 112 by mounting bolts within the connecting hole; this application does not impose any limitations on this aspect.

[0079] Similarly, in one embodiment, the third shielding block 1171 and the fourth shielding block 1172 are integrally formed with the second blade frame 113 or are detachably connected.

[0080] See Figures 3 to 6 In one embodiment, the first fixing block 1181 and the second fixing block 1182 are integrally formed with the mounting base 111 or detachably connected.

[0081] As an example, this application integrally forms the first fixing block 1181 and the second fixing block 1182 with the mounting base 111. This enables the first fixing block 1181, the second fixing block 1182 and the mounting base 111 to form an integral rigid component, which can improve the structural strength between the mounting base 111 and each fixing block, and reduce the assembly steps of the mounting base 111, thereby improving assembly efficiency.

[0082] As an example, this application detachably connects the first fixing block 1181 and the second fixing block 1182 to the mounting base 111, which facilitates individual replacement and maintenance of each fixing block, thereby reducing maintenance costs. Understandably, this application may provide at least one second connecting hole 1181c on the downward-facing side of the first fixing block 1181, allowing the first fixing block 1181 to be fixed to the mounting base 111 by mounting bolts within the second connecting hole 1181c. Similarly, this application may provide at least one connecting hole on the downward-facing side of the second fixing block 1182, allowing the second fixing block 1182 to be fixed to the mounting base 111 by mounting bolts within the connecting hole; this application does not impose any limitations on this aspect.

[0083] See Figure 3 and Figure 7 In one embodiment, the first blade cavity 1121 is provided with a first upper cavity 1121a and a first lower cavity 1121b separated along the height direction of the first blade frame 112. The first blade group 114 includes a first upper blade 1141 slidably disposed in the first upper cavity 1121a and a first lower blade 1142 slidably disposed in the first lower cavity 1121b. At least one of the first upper blade 1141 and the first lower blade 1142 is slidably attached between the first shielding block 1161 and the second shielding block 1162. The second blade cavity 1131 is provided with a second upper cavity 1131a and a second lower cavity 1131b separated along the height direction of the second blade frame 113. The second blade group 115 includes a second upper blade 1151 slidably disposed in the second upper cavity 1131a and a second lower blade 1152 slidably disposed in the second lower cavity 1131b. At least one of the second upper blade 1151 and the second lower blade 1152 is slidably attached between the third shielding block 1171 and the fourth shielding block 1172.

[0084] It should be noted that the multi-leaf grating 11 provided in this application may include a double-layer multi-leaf grating 11. As an example, the first leaf frame 112 is divided into a first upper cavity 1121a and a first lower cavity 1121b along the vertical direction in the figure. The first upper cavity 1121a is located on the upper layer and is disposed near the mounting base 111, while the first lower cavity 1121b is located on the lower layer. The first leaf group 114 includes two independent layers of leaves, namely a first upper leaf 1141 and a first lower leaf 1142. The first upper leaf 1141 is slidably disposed in the first upper cavity 1121a, and the first lower leaf 1142 is slidably disposed in the first lower cavity 1121b. This arrangement allows for the use of double-layer leaves to adapt to complex tumor shapes, and also allows the first lower leaf 1142 to shield the rays 151 transmitted by the first upper leaf 1141, thereby improving the shielding effect. Meanwhile, the first shielding block 1161 and the second shielding block 1162 can be separated on both sides of the first upper blade 1141, or on both sides of the first lower blade 1142, or simultaneously located on both sides of the first upper blade 1141 and the first lower blade 1142; this application does not impose any limitations. This arrangement allows the first shielding block 1161 and the second shielding block 1162 to shield the leakage of radiation 151 from the left and right sides of the double-layer blades. Understandably, the first upper blade 1141 and the first lower blade 1142 can move independently, driven by linear motors, lead screw drives, or other similar drive structures; this application does not impose any limitations on this either.

[0085] Similarly, the second blade frame 113 is divided into a second upper cavity 1131a and a second lower cavity 1131b along the vertical direction shown in the figure. The second upper cavity 1131a is located on the upper layer near the mounting base 111, and the second lower cavity 1131b is located on the lower layer. The second blade group 115 includes two independent blades, namely a second upper blade 1151 and a second lower blade 1152. The second upper blade 1151 is slidably disposed in the second upper cavity 1131a, and the second lower blade 1152 is slidably disposed in the second lower cavity 1131b. This arrangement allows for the use of double-layer blades to adapt to complex tumor shapes, and also allows the second lower blade 1152 to shield the rays 151 transmitted by the second upper blade 1151, thereby improving the shielding effect. Meanwhile, the third shielding block 1171 and the fourth shielding block 1172 can be separated on both sides of the second upper blade 1151, or on both sides of the second lower blade 1152, or simultaneously located on both sides of the second upper blade 1151 and the second lower blade 1152; this application does not impose any limitations. This arrangement allows the third shielding block 1171 and the fourth shielding block 1172 to shield the leakage of radiation 151 from the left and right sides of the double-layer blades. Understandably, the second upper blade 1151 and the second lower blade 1152 can move independently, driven by linear motors, lead screw drives, or other similar drive structures; this application does not impose any limitations on this either.

[0086] See Figure 4 In one embodiment, in the direction from the first lower blade 1142 to the first upper blade 1141, the first shielding block 1161 and the second shielding block 1162 each partially extend beyond the first upper blade 1141.

[0087] As an example, along the top-to-bottom direction in the figure, the first shielding block 1161 and the second shielding block 1162 are respectively positioned above the first upper blade 1141. Understandably, after the radiation source 15 emits radiation 151, a portion of the radiation 151 will leak from the left and right sides of the first upper blade 1141 as it passes through it. This application configures the first shielding block 1161 and the second shielding block 1162 to extend beyond the first upper blade 1141. This arrangement allows the portion of each shielding block extending beyond the first upper blade 1141 to block radiation 151 attempting to escape from the top edge of the first upper blade 1141, thereby further improving the shielding effect.

[0088] Similarly, in one embodiment, the third shielding block 1171 and the fourth shielding block 1172 extend partially beyond the second upper blade 1151 in the direction from the second lower blade 1152 to the second upper blade 1151.

[0089] See Figures 8 to 9 According to a second aspect of the present application, a radiotherapy device is provided, including a drive assembly 12 and a multi-leaf grating 11 of any of the above embodiments. The drive assembly 12 is connected to a mounting base 111, and the drive assembly 12 is respectively connected to a first leaf frame 112 and a second leaf frame 113, so that the first leaf frame 112 and the second leaf frame 113 can move closer to or further away from each other.

[0090] During use, the radiotherapy device 1 provided in this application has a control system that can activate the drive assembly 12 according to the shape of the tumor target area, thereby driving the first blade frame 112 and the second blade frame 113 to move relative to each other along the mounting base 111 to the target position. Simultaneously, the control system can drive each blade in the first blade group 114 to slide independently within the first blade cavity 1121, and drive each blade in the second blade group 115 to slide independently within the second blade cavity 1131, so that the first blade group 114 and the second blade group 115 together form a radiation field shape consistent with the shape of the tumor target area, for tumor treatment.

[0091] During this process, the first shielding block 1161 and the second shielding block 1162 on the first blade frame 112 can move with the first blade frame 112, and the third shielding block 1171 and the fourth shielding block 1172 on the second blade frame 113 can move with the second blade frame 113, so that the first shielding block 1161 and the third shielding block 1171 slide along the first fixed block 1181 to move closer to or further away from each other, and the second shielding block 1162 and the fourth shielding block 1172 slide along the second fixed block 1182 to move closer to or further away from each other.

[0092] Thus, the radiotherapy device 1 provided in this application, by applying the multi-leaf grating 11 of any of the above embodiments, can form a continuous shielding barrier by combining the dynamic shielding components and the fixed shielding components 118, regardless of where the first leaf frame 112 and the second leaf frame 113 are moved, thereby shielding the outward scattering rays 151 from the sides of each leaf group, improving the beam collimation accuracy of the multi-leaf grating 11, protecting the normal tissues of the patient located outside the tumor target area, and improving the treatment effect of the radiotherapy device 1.

[0093] Understandably, the drive assembly 12 may include a linear motor, cylinder, hydraulic cylinder, or lead screw mechanism, etc., and this application does not impose any limitations.

[0094] See Figure 10 The radiotherapy device 1 provided in this application also includes a primary collimator 13, a secondary collimator 14, and a radiation source 15. Along the top-to-bottom direction in the figure, the radiation source 15, the primary collimator 13, and the secondary collimator 14 are sequentially positioned above the mounting base 111. When the radiation source 15 emits radiation 151, the radiation 151 passes through the primary collimator 13, the secondary collimator 14, and each blade assembly sequentially from top to bottom. Each shielding block and its corresponding fixing block can form a continuous and uninterrupted shielding barrier on the left and right sides of each blade assembly to prevent radiation 151 from leaking from the left and right sides of each blade assembly, thereby protecting the normal tissue outside the tumor target area and improving the therapeutic effect of the radiotherapy device 1.

[0095] According to a third aspect of the embodiments of this application, a control method for a radiotherapy device 1 is provided. The radiotherapy device 1 includes the aforementioned radiotherapy device 1. The method includes: controlling a drive assembly 12 to move a first blade frame 112 and a second blade frame 113 closer together, causing a first shielding block 1161 and a third shielding block 1171 to slide along a first fixing block 1181 to move closer together, and causing a second shielding block 1162 and a fourth shielding block 1172 to slide along a second fixing block 1182 to move closer together. And / or, controlling the drive assembly 12 to move the first blade frame 112 and the second blade frame 113 further apart, causing the first shielding block 1161 and the third shielding block 1171 to slide along the first fixing block 1181 to move further apart, and causing the second shielding block 1162 and the fourth shielding block 1172 to slide along the second fixing block 1182 to move further apart.

[0096] Thus, in the control method of the radiotherapy device 1 provided in this application, no matter where the first leaf frame 112 and the second leaf frame 113 move, this application can form a continuous shielding barrier by combining the use of each moving shielding component and the fixed shielding component 118 to shield the outward scattering rays 151 from the side of each leaf group, improve the beam collimation accuracy of the multi-leaf grating 11, protect the normal tissue of the patient located outside the tumor target area, and improve the treatment effect of the radiotherapy device 1.

[0097] The technical solutions or features described in the above embodiments can be combined or complemented by each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings. All modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A multi-leaf collimator, characterized by, The utility model relates to a first vane frame, with the mounting seat sliding connection and is equipped with first vane chamber, second vane frame, with the mounting seat sliding connection and with first vane frame opposite setting, second vane frame is equipped with second vane chamber, first vane group, sliding setting in first vane chamber, second vane group, sliding setting in second vane chamber, first dynamic shielding assembly, including respectively the first shielding block and the second shielding block of the first vane frame towards second vane frame one side convex, first shielding block and second shielding block are separated in the width direction of first vane frame in first vane group both sides, second dynamic shielding assembly, including respectively the third shielding block and the fourth shielding block of the second vane frame towards first vane frame one side convex, third shielding block and fourth shielding block are separated in the width direction of second vane frame in second vane group both sides, and fixed shielding assembly, including respectively the first fixed block and the second fixed block of the mounting seat, first fixed block is connected between first shielding block and third shielding block sliding, second fixed block is connected between second shielding block and fourth shielding block sliding. The first shielding block is equipped with the first inclined plane of sliding close with first vane group, the second shielding block is equipped with the second inclined plane of sliding close with first vane group, and the inclination direction of the first inclined plane is opposite to the inclination direction of the second inclined plane. The third shielding block is equipped with the third inclined plane of sliding close with second vane group, the fourth shielding block is equipped with the fourth inclined plane of sliding close with second vane group, and the inclination direction of the third inclined plane is opposite to the inclination direction of the fourth inclined plane. The first fixed block is equipped with the first avoiding groove, and the first shielding block and the third shielding block are respectively connected to the first avoiding groove slidingly. The second fixed block is equipped with the second avoiding groove, and the second shielding block and the fourth shielding block are respectively connected to the second avoiding groove slidingly. The first avoiding groove is arranged on the side of the first fixed block facing the second fixed block, and the second avoiding groove is arranged on the side of the second fixed block facing the first fixed block. In the height direction of the first vane frame, the cross sections of the first shielding block, the second shielding block, the third shielding block, and the fourth shielding block are right trapezoids, and the first avoiding groove and the second avoiding groove are L-shaped grooves matching the right trapezoids. The side of the first fixed block facing the second fixed block is further provided with a first matching inclined surface, the first avoiding groove is located between the mounting seat and the first matching inclined surface, and the inclination direction of the first matching inclined surface is the same as that of the first inclined surface and the third inclined surface. The side of the second fixed block facing the first fixed block is further provided with a second matching inclined surface, the second avoiding groove is located between the mounting seat and the second matching inclined surface, and the inclination direction of the second matching inclined surface is the same as that of the second inclined surface and the fourth inclined surface. ​ ​ 2. The multileaf collimator of claim 1, wherein, ​ ​ 3. The multileaf collimator of claim 2, wherein, ​ 4. The multileaf collimator of claim 3, wherein, ​ 5. The multileaf collimator of claim 4, wherein, ​ 6. The multileaf collimator of claim 4, wherein, ​ ​ 7. The multileaf collimator of claim 2, wherein, The first shielding block is provided with a first movable sliding groove, the third shielding block is provided with a first mating groove communicating with the first movable sliding groove, the end of the first fixing block near the first shielding block is slidably disposed in the first movable sliding groove, and the end of the first fixing block near the third shielding block is slidably disposed in the first mating groove; The second shielding block is provided with a second movable sliding groove, and the fourth shielding block is provided with a second mating groove that communicates with the second movable sliding groove. The end of the second fixing block near the second shielding block is slidably disposed in the second movable sliding groove, and the end of the second fixing block near the fourth shielding block is slidably disposed in the second mating groove.

8. The multileaf collimator of claim 7, wherein, The first movable groove is disposed on the side of the first shielding block facing away from the first inclined surface, and the first mating groove is disposed on the side of the third shielding block facing away from the third inclined surface; The second movable groove is disposed on the side of the second shielding block facing away from the second inclined surface, and the second mating groove is disposed on the side of the fourth shielding block facing away from the fourth inclined surface.

9. The multileaf collimator of claim 1, wherein, The material of the first dynamic shielding component includes one of tungsten and tungsten alloys, molybdenum and molybdenum alloys, and lead and lead alloys; and / or, the material of the second dynamic shielding component includes one of tungsten and tungsten alloys, molybdenum and molybdenum alloys, and lead and lead alloys; and / or, the material of the fixed shielding component includes one of tungsten and tungsten alloys, molybdenum and molybdenum alloys, and lead and lead alloys.

10. The multileaf collimator of claim 1, wherein, The first shielding block and the second shielding block are integrally formed with or detachably connected to the first blade frame; and / or, the third shielding block and the fourth shielding block are integrally formed with or detachably connected to the second blade frame; and / or, the first fixing block and the second fixing block are integrally formed with or detachably connected to the mounting base.

11. The multileaf collimator according to any of claims 1 to 10, characterized in that, The first blade cavity is provided with a first upper cavity and a first lower cavity separated along the height direction of the first blade frame. The first blade group includes a first upper blade slidably disposed in the first upper cavity and a first lower blade slidably disposed in the first lower cavity. At least one of the first upper blade and the first lower blade is slidably attached between the first shielding block and the second shielding block. The second blade cavity is provided with a second upper cavity and a second lower cavity separated along the height direction of the second blade frame. The second blade group includes a second upper blade slidably disposed in the second upper cavity and a second lower blade slidably disposed in the second lower cavity. At least one of the second upper blade and the second lower blade is slidably attached between the third shielding block and the fourth shielding block.

12. The multileaf collimator of claim 11, wherein, In the direction from the first lower blade to the first upper blade, the first shielding block and the second shielding block each extend partially beyond the first upper blade. And / or, in the direction from the second lower blade to the second upper blade, the third shielding block and the fourth shielding block each partially extend beyond the second upper blade.

13. A radiotherapy device, characterized in that, The device includes a driving component and a multi-leaf grating as described in any one of claims 1 to 12, wherein the driving component is connected to the mounting base and is drivenly connected to the first leaf frame and the second leaf frame respectively, so that the first leaf frame and the second leaf frame can move closer to or further away from each other.

14. A control method of a radiotherapy apparatus, characterized by, The radiotherapy device includes the radiotherapy device of claim 13, and the method includes: The drive assembly is controlled to move the first blade frame and the second blade frame closer to each other, so that the first shielding block and the third shielding block slide along the first fixed block to move closer to each other, and the second shielding block and the fourth shielding block slide along the second fixed block to move closer to each other; And / or, control the drive assembly to move the first blade frame and the second blade frame away from each other, so that the first shielding block and the third shielding block slide along the first fixed block to move away from each other, and so that the second shielding block and the fourth shielding block slide along the second fixed block to move away from each other.

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