Multi-leaf collimator, radiotherapy device and leaf dismounting method

Abstract

The application provides a multi-leaf collimator, a radiotherapy device and a leaf dismounting method. The multi-leaf collimator comprises a leaf frame, a first grating assembly, a first stop assembly and a driving assembly. The leaf frame is provided with a first leaf cavity and a first avoiding groove in the first leaf cavity, and the first avoiding groove extends along the width direction of the leaf frame. The first grating assembly comprises a first leaf and a first limiting structure protruding from the first leaf, the first leaf is slidably arranged in the first leaf cavity along the width direction of the leaf frame, and the first limiting structure is in sliding cooperation with the first avoiding groove. The first stop assembly is detachably arranged in the first avoiding groove. The driving assembly is in transmission connection with the first leaf, so that the first leaf can drive the first limiting structure to reciprocally slide along the first avoiding groove, so that the first limiting structure is in abutment or separation with the first stop assembly. The multi-leaf collimator provided by the application can avoid deformation and damage of the leaf due to impact or falling, so as to improve the treatment effect of the radiotherapy device and reduce the maintenance cost of the leaf.

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 a method for leaf removal. Background Technology

[0002] Radiotherapy equipment is a local treatment device that uses beams of radiation to irradiate tumors to treat tumor diseases. Multileaf collimators (MLCs) are the core components of radiotherapy equipment. In existing technologies, radiotherapy equipment typically uses two opposing MLCs. The blades of each MLC are usually driven by a motor and a lead screw mechanism to reciprocate, allowing the blades of the grating on one side to move closer to or further away from the blades of the opposite side. This allows for the formation of an irregular radiation field based on the shape of the tumor, enabling the radiation beam to penetrate directly to the tumor lesion and avoid damaging the patient's normal tissues. However, in these technologies, when the blades on one side approach each other, blade collisions or even blade detachment often occur, leading to blade deformation and damage. This not only affects the therapeutic effect of the radiotherapy equipment but also increases the blade maintenance costs. Summary of the Invention

[0003] In view of this, this application provides a multi-leaf grating, a radiotherapy device, and a leaf disassembly method, which can prevent the leaves from being deformed or damaged due to impact or detachment, thereby improving the treatment effect of the radiotherapy device and reducing the leaf maintenance cost.

[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 leaf frame, a first grating assembly, a first stop assembly, and a drive assembly. The leaf frame has a first leaf cavity and a first clearance groove located within the first leaf cavity, the first clearance groove extending along the width direction of the leaf frame. The first grating assembly includes a first leaf and a first limiting structure protruding from the first leaf. The first leaf is slidably disposed within the first leaf cavity along the width direction of the leaf frame, and the first limiting structure is slidably engaged with the first clearance groove. The first stop assembly is detachably disposed within the first clearance groove. The drive assembly is drively connected to the first leaf, enabling the first leaf to drive the first limiting structure to reciprocate along the first clearance groove, so that the first limiting structure abuts against or separates from the first stop assembly.

[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 allows the first leaf to extend out of the first leaf cavity via the driving assembly. The first leaf then drives the first limiting structure to slide synchronously within the first clearance groove, approaching the first stop assembly until the first limiting structure abuts against the first stop assembly, preventing further movement of the first leaf. This indicates that the first leaf has reached its preset maximum extension position, at which point the driving assembly stops driving. This prevents the first leaf from colliding with or sliding off the opposite leaf due to overextension, effectively preventing deformation and damage to the first leaf and reducing replacement and maintenance costs. Furthermore, because this application prevents deformation and damage to the first leaf, it ensures the geometric accuracy of the irregular radiation field formed by the multi-leaf grating, preventing beam leakage and damage to surrounding normal tissue, thereby improving the therapeutic effect of the radiotherapy equipment. Alternatively, the driving assembly can also drive the first leaf to slide back into the first leaf cavity, moving the first limiting structure away from the first stop assembly.

[0006] The technical solution of this application will be further described below.

[0007] In one embodiment, along the height direction of the blade frame, the first blade cavity has a first top wall and a first bottom wall that are spaced apart from each other, and a first clearance groove is recessed in the first bottom wall. The first blade has a top side facing the first top wall and a bottom side facing the first bottom wall, and a first limiting structure protrudes from the bottom side.

[0008] In one embodiment, the first blade is further provided with a front side and a tail side spaced apart along the width direction of the blade frame, the first limiting structure is located between the front side and the tail side, and the distance from the first limiting structure to the front side is not less than the distance from the first limiting structure to the tail side.

[0009] In one embodiment, the orthographic projection of the first limiting structure does not exceed the orthographic projection boundary of the first blade along the height direction of the blade frame.

[0010] In one embodiment, the first limiting structure includes a protrusion on the bottom side, the protrusion being integrally formed with the first blade.

[0011] In one embodiment, a connecting hole recessed towards the top is provided on the bottom side, and the first limiting structure includes a connector that is inserted into the connecting hole.

[0012] In one embodiment, the tail side has a groove recessed towards the front, and at least a portion of the drive assembly is located within the groove and is drively connected to the first blade.

[0013] In one embodiment, the groove includes a first recess and a second recess connected sequentially in a direction from the tail side to the front side. The drive assembly includes a drive frame and a drive source fixed to the drive frame. The drive frame is fixed to the blade frame, and at least a portion of the drive frame is located within the first recess, while at least a portion of the drive source is located within the second recess and is drively connected to the first blade.

[0014] In one embodiment, multiple first blades are arranged sequentially along the length of the blade frame, multiple first limiting structures are arranged corresponding to each first blade, and multiple first clearance grooves are arranged sequentially and spaced along the length of the blade frame. Each first limiting structure and each first clearance groove are slidably engaged. The first bottom wall is also provided with a first mounting groove, which extends through each first clearance groove along the length of the blade frame. The first mounting groove is located between the front side of each first blade and each first limiting structure. A first stop assembly is detachably installed in the first mounting groove, so that each first limiting structure can abut against or separate from the first stop assembly.

[0015] In one embodiment, the first blade cavity has a first sidewall and a second sidewall spaced apart along the length of the blade frame. The blade frame also has a first mounting hole and a second mounting hole. The first mounting hole penetrates the first sidewall and communicates with a first mounting groove, and the second mounting hole penetrates the second sidewall and communicates with the first mounting groove. The first stop assembly includes a first stop member and a second stop member. The first stop member is inserted into the first mounting groove through the first mounting hole, and the second stop member is inserted into the first mounting groove through the second mounting hole, with the first stop member and the second stop member abutting against each other.

[0016] In one embodiment, the first stop and the second stop are inserted into each other along the length of the blade frame.

[0017] In one embodiment, the first stop and the second stop are connected by magnetic attraction.

[0018] In one embodiment, the height of the first stop gradually decreases and the height of the second stop gradually increases in the direction from the first sidewall to the second sidewall, and the mating position of the first stop and the second stop is located at the middle position between the first sidewall and the second sidewall.

[0019] In one embodiment, the first stop member has a first top surface facing the first top wall, and the second stop member has a second top surface facing the first top wall. In the direction from the first side wall to the second side wall, the bottom side of each first blade abuts against the first top surface and the second top surface in sequence.

[0020] In one embodiment, the first top surface and the second top surface are respectively configured as inclined surfaces or curved surfaces, and the inclination direction of the first top surface is opposite to the inclination direction of the second top surface.

[0021] In one embodiment, the first stop includes a first blocking portion and a first stop portion connected to the first blocking portion, at least a portion of the first blocking portion protrudes outside the first mounting hole and blocks the first mounting hole, and the first stop portion extends along the length direction of the blade frame and is located in the first mounting groove.

[0022] In one embodiment, the second stop includes a second blocking portion and a second stop portion connected to the second blocking portion, at least a portion of the second blocking portion protruding outside the second mounting hole and blocking the second mounting hole, and the second stop portion extending along the length direction of the blade frame and located in the first mounting groove.

[0023] In one embodiment, the first stop portion is provided with a first buffer layer for abutting against the first limiting structure.

[0024] In one embodiment, the second stop portion is provided with a second buffer layer for abutting against the first limiting structure.

[0025] In one embodiment, the first buffer layer and / or the second buffer layer respectively include a rubber layer, a silicone layer, a latex layer, a polyurethane layer, or a sponge layer.

[0026] In one embodiment, the first bottom wall is further provided with a plurality of first guide grooves arranged sequentially along the length direction of the blade frame. Each first guide groove extends along the width direction of the blade frame, and each first blade slides in correspondence with each first guide groove. Each first guide groove is recessed with a first clearance groove, and a first mounting groove extends through each first guide groove along the length direction of the blade frame.

[0027] In one embodiment, the blade frame further includes a second blade cavity and a second clearance groove. The second blade cavity is separated from the first blade cavity along the height direction of the blade frame, and the second clearance groove is located within the second blade cavity and extends along the width direction of the blade frame. The multi-leaf grating also includes a second grating assembly and a second stop assembly. The second grating assembly includes a second blade and a second limiting structure protruding from the second blade. The second blade is slidably disposed within the second blade cavity along the width direction of the blade frame. The second limiting structure is slidably engaged with the second clearance groove, and the second stop assembly is detachably disposed within the second clearance groove. The drive assembly is also drively connected to the second blade, enabling the second blade to drive the second limiting structure to reciprocate along the second clearance groove, so that the second limiting structure abuts against or separates from the second stop assembly.

[0028] In one embodiment, along the height direction of the blade frame, the second blade cavity is provided with a second top wall and a second bottom wall that are spaced apart from each other, and a second clearance groove is recessed in the second top wall. Along the direction from the second bottom wall to the second top wall, a second limiting structure protrudes from the side of the second blade facing the second top wall.

[0029] According to a second aspect of the embodiments of this application, a radiotherapy device is provided, including the multileaf grating of any of the above embodiments.

[0030] 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. During the use of the radiotherapy device, the control system can control the activation of the drive assembly according to the shape of the tumor target area to drive the first grating assembly to slide out or retract within the cavity of the first leaf. During the sliding extension of the first grating assembly, the first leaf drives the first limiting structure to slide within the first clearance groove to approach the first stop assembly until the first limiting structure abuts against the first stop assembly, preventing the first leaf from continuing to move. This indicates that the first leaf has reached the preset maximum extension position, at which point the drive assembly stops driving, thus preventing the first leaf from colliding with or sliding off the opposite leaf due to overextension. This effectively prevents the first leaf from deforming and being damaged, thereby reducing the replacement and maintenance costs of the first leaf. Simultaneously, because this application can prevent the first leaf from deforming and being damaged, it can ensure the geometric accuracy of the irregular radiation field formed by the multi-leaf grating, preventing beam leakage from damaging normal tissue around the tumor, thereby improving the therapeutic effect of the radiotherapy device.

[0031] According to a third aspect of the present application, a method for disassembling the blades of a multi-leaf grating is provided. The multi-leaf grating includes the multi-leaf grating of any of the above embodiments. The method includes: removing a first stop assembly in a first clearance groove; and extracting a first blade along the width direction of the blade frame, so that the first blade slides out from the first blade cavity.

[0032] The technical solutions provided by the embodiments of this application may include the following beneficial effects: After prolonged use, the first leaf of a multi-leaf grating may wear down, requiring timely replacement by operators to ensure the geometric accuracy of the shooting field. According to the leaf removal method provided in this application, when maintaining or replacing the first leaf, the operator can first pull the first stop assembly out of the first clearance groove, opening both the front and rear sides of the first clearance groove. Then, the operator simply needs to pull the first leaf to be replaced out of the first leaf cavity, allowing the first limiting structure to smoothly slide out of the first clearance groove, thereby removing the first leaf. This design eliminates the need for additional removal of the leaf frame or drive assembly, enabling quick, non-destructive, and easy disassembly and replacement of the first leaf, thus improving the maintenance efficiency of the multi-leaf grating and reducing maintenance costs.

[0033] In one embodiment, the first blade cavity has a first sidewall and a second sidewall spaced apart along the length of the blade frame. Multiple first blades are provided along the direction from the first sidewall to the second sidewall, sequentially including a first side blade, a first intermediate blade, and a second side blade. Multiple first clearance slots are provided, each corresponding to one of the multiple first blades. The first blade cavity also has a first mounting slot penetrating each of the first clearance slots. The first sidewall has a first mounting hole communicating with the first mounting slot, and the second sidewall has a second mounting hole communicating with the first mounting slot. The first stop assembly includes a first stop member and a second stop member that are mated together. The first stop member is inserted into the first mounting slot through the first mounting hole, and the second stop member is inserted into the first mounting slot through the second mounting hole.

[0034] In the method, removing the first stop assembly within the first clearance groove includes: When the first side blade is removed, the first stop is pulled out of the first mounting hole and moved along the second side wall in the direction of the first side wall to avoid the first side blade.

[0035] When the second side blade is removed, the second stop is pulled out of the second mounting hole and moved along the direction from the first side wall to the second side wall to avoid the second side blade.

[0036] When the first intermediate blade is removed, the first stop in the first mounting hole is pulled out and moved along the second side wall in the direction of the first side wall. The second stop in the second mounting hole is also pulled out and moved along the first side wall in the direction of the second side wall to avoid the first intermediate blade.

[0037] 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

[0038] 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.

[0039] 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.

[0040] Figure 1 This is a schematic diagram of the structure of radiotherapy equipment in related technologies.

[0041] Figure 2 This is a top view of a multileaf grating provided in one embodiment of this application.

[0042] Figure 3 for Figure 2 Sectional view along the middle AA.

[0043] Figure 4 for Figure 2 A three-dimensional view of the multileaf grating shown.

[0044] Figure 5 This is a schematic diagram of the structure of a first grating assembly provided in one embodiment of this application.

[0045] Figure 6 A top view of a blade frame with a first mounting groove provided in one embodiment of this application.

[0046] Figure 7 This is a schematic diagram of the internal structure of the first stop component provided in one embodiment of the present application, which is disposed in the blade frame.

[0047] Figure 8 for Figure 7 A schematic diagram of the structure of the first stop component.

[0048] Figure 9 for Figure 7 A schematic diagram of the structure of the second stop component.

[0049] Figure 10 This is a schematic diagram of a blade frame with a first guide groove provided in one embodiment of the present application.

[0050] Figure 11 This is a schematic diagram of a blade frame with upper and lower blade cavities provided in one embodiment of the present application.

[0051] Figure 12 for Figure 11 The diagram shows a schematic of a double-layer grating assembly mounted on a blade frame.

[0052] Figure label: 100 - Existing radiotherapy equipment; 110 - This side multileaf grating; 120 - This side leaf; 130 - Contralateral multileaf grating; 140 - Contralateral leaf.

[0053] 1-Multi-leaf grating; 11-Leaf frame; 111-First blade cavity; 1111-First top wall; 1112-First bottom wall; 1113-First side wall; 1114-Second side wall; 112-First clearance groove; 113-First mounting groove; 114-First mounting hole; 115-Second mounting hole; 116-First guide groove; 117-Second blade cavity; 1171-Second top wall; 1172-Second bottom wall; 118-Second clearance groove; 119-Third mounting hole; 12-First grating assembly; 121-First blade; 1211-Top side; 1212-Bottom side; 1213-Front side; 1214-Tail side; 1215- Groove; 1215a - First recess; 1215b - Second recess; 122 - First limiting structure; 13 - First stop assembly; 131 - First stop member; 1311 - First top surface; 1312 - First sealing part; 1313 - First stop part; 1314 - First buffer layer; 1315 - Slot; 132 - Second stop member; 1321 - Second top surface; 1322 - Second sealing part; 1323 - Second stop part; 1324 - Second buffer layer; 1325 - Insert block; 133 - Dating position; 14 - Drive assembly; 141 - Drive frame; 142 - Drive source; 15 - Second grating assembly; 16 - Second stop assembly. Detailed Implementation

[0054] 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.

[0055] 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.

[0056] Radiotherapy equipment is a local treatment device that uses beams of radiation to irradiate tumors to treat tumor diseases. Multileaf collimators (MLCs) are the core components of radiotherapy equipment. In related technologies, such as... Figure 1As shown, existing radiotherapy equipment 100 typically has two opposing multi-leaf gratings. The blades of each grating are usually driven reciprocally by a motor and a lead screw transmission mechanism, allowing the blades of the grating 110 on one side and the blades of the grating 130 on the other side to move closer or further apart. This allows for the formation of an irregular radiation field based on the shape of the patient's tumor, enabling the radiation beam to penetrate directly to the tumor lesion and avoid damaging the patient's normal tissues. However, in related technologies, when the blades 120 and 140 on one side approach each other, blade collisions or even blade detachment often occur, leading to blade deformation and damage. This not only affects the therapeutic effect of the radiotherapy equipment but also increases the blade maintenance cost.

[0057] Based on this, this application provides a multi-leaf grating, a radiotherapy device, and a leaf disassembly method, which can prevent the leaves from being deformed or damaged due to impact or detachment, thereby improving the treatment effect of the radiotherapy device and reducing the leaf maintenance cost.

[0058] See Figures 2 to 4 According to a first aspect of this application, a multi-leaf grating 1 is provided, including a leaf frame 11, a first grating assembly 12, a first stop assembly 13, and a drive assembly 14. The leaf frame 11 has a first leaf cavity 111 and a first clearance groove 112 located within the first leaf cavity 111, the first clearance groove 112 extending along the width direction of the leaf frame 11. The first grating assembly 12 includes a first leaf 121 and a first limiting structure 122 protruding from the first leaf 121. The first leaf 121 is slidably disposed within the first leaf cavity 111 along the width direction of the leaf frame 11, and the first limiting structure 122 is slidably engaged with the first clearance groove 112. The first stop assembly 13 is detachably disposed within the first clearance groove 112. The drive assembly 14 is drively connected to the first leaf 121, enabling the first leaf 121 to drive the first limiting structure 122 to reciprocate along the first clearance groove 112, so that the first limiting structure 122 abuts against or separates from the first stop assembly 13.

[0059] It should be noted that the multi-leaf grating 1 is a beam shaping device used in radiotherapy equipment (such as a linear accelerator). The multi-leaf grating 1 can utilize the movement of its leaves to form a radiation field that matches the shape of the tumor target area, thereby treating the tumor and avoiding damage to normal tissue. It is understood that the multi-leaf grating 1 provided in this application can be used as a local multi-leaf grating or a contralateral multi-leaf grating in a radiotherapy equipment, and this application does not impose any limitations.

[0060] Specifically, in this application, the blade frame 11 serves as a support structure for the multi-leaf grating 1, and can be used to support the various components of the multi-leaf grating 1. For example, the blade frame 11 has a first blade cavity 111, and the first blade cavity 111 has openings on both sides arranged in the front-back direction as shown in the figure. The first grating assembly 12 includes a first blade 121, which is slidably disposed within the first blade cavity 111. The drive assembly 14 can be fixed to the blade frame 11 and is drively connected to the first blade 121. The drive assembly 14 can drive the first blade 121 to slide back and forth in the front-back direction as shown in the figure, so that the first blade 121 can slide out or slide back relative to the first blade cavity 111 to adapt to and match the shape of each tumor. It is understood that the drive assembly 14 includes drive structures such as linear motors and lead screw drives, which are not limited in this application.

[0061] Taking the multileaf grating 1 provided in this application as an example of a local multileaf grating in a radiotherapy device, to prevent the first leaf 121 from colliding with or sliding off the opposite leaf, this application also provides a first limiting structure 122 protruding from the first leaf 121, and a first clearance groove 112 is formed in the first leaf cavity 111, with a detachable first stop component 13 provided in the first clearance groove 112. For example, the first clearance groove 112 also extends in the front-back direction in the figure to accommodate the first limiting structure 122 protruding from the first leaf 121. With this configuration, when the driving component 14 drives the first leaf 121 to slide out of the first leaf cavity 111, the first leaf 121 can also simultaneously drive the first limiting structure 122 to slide in the first clearance groove 112 until the first limiting structure 122 abuts against the first stop component 13, indicating that the first leaf 121 has slid into place and cannot continue to slide in the same direction, thereby limiting the sliding distance of the first leaf 121 to avoid collision or detachment of the first leaf 121 with the opposite leaf.

[0062] Understandably, the width of the blade frame 11 can be set along the front-to-back direction in the figure, and the length of the blade frame 11 can be set along the left-to-right direction in the figure.

[0063] Thus, during the use of the multi-leaf grating 1 provided in this application, the operator can pre-install the first stop assembly 13 into a suitable position in the first clearance groove 112 according to the required field size before radiotherapy, so as to set the maximum extension stroke of the first leaf 121. After the start of radiotherapy, the drive assembly 14 can drive the first leaf 121 to slide out of the first leaf cavity 111 according to the control command. At this time, the first leaf 121 can drive the first limiting structure 122 to slide along the first clearance groove 112 until the first limiting structure 122 abuts against the first stop assembly 13, so that the first leaf 121 is prevented from continuing to move to the opposite leaf, indicating that the first leaf 121 has reached the preset maximum extension position, and then the drive assembly 14 stops driving to prevent the first leaf 121 from being deformed and damaged due to collision with the opposite leaf or sliding off, thereby reducing the maintenance cost of the first leaf 121. Of course, the drive assembly 14 can also drive the first blade 121 to slide and retract within the first blade cavity 111 according to the control command, so as to move away from the opposite blade and separate the first limiting structure 122 from the first stop assembly 13.

[0064] Therefore, the multi-leaf grating 1 provided in this application can limit the extension position of the first leaf 121 by utilizing the mutual abutment between the first limiting structure 122 and the first stop component 13, so as to prevent the first leaf 121 from colliding with or sliding off the opposite leaf due to excessive extension. This effectively prevents the first leaf 121 from deforming and being damaged, thereby reducing the replacement and maintenance costs of the first leaf 121. At the same time, because this application can prevent the first leaf 121 from deforming and being damaged, it can also ensure the geometric accuracy of the irregular radiation field formed by the multi-leaf grating 1, so as to avoid radiation beam leakage damaging the normal tissue around the tumor, thereby improving the therapeutic effect of the radiotherapy equipment.

[0065] In one embodiment, the first stop assembly 13 is detachably installed into the first clearance groove 112. The detachable installation method is not limited to threaded connections, snap-fit ​​connections, or plug-in connections, and this application makes no limitation thereto. With this configuration, when the operator needs to disassemble the first blade 121 for maintenance, the operator only needs to remove the first stop assembly 13 from the first clearance groove 112 and then pull out the first blade 121 along the front-back direction shown in the figure. This allows the first blade 121 to slide out of the first blade cavity 111, and the first limiting structure 122 slides out of the first clearance groove 112 along with the first blade 121, facilitating the individual replacement of the worn first blade 121. Thus, the operator does not need to disassemble the entire blade frame 11 to replace the first blade 121, reducing the maintenance difficulty and cost of the first blade 121. Simultaneously, this configuration allows the operator to adjust the installation position of the first stop assembly 13 within the first clearance groove 112 according to clinical needs, flexibly changing the maximum stroke of the first blade 121 to adapt to the requirements of tumor firing fields of different shapes and sizes.

[0066] See Figure 3 and Figure 5 In one embodiment, along the height direction of the blade frame 11, the first blade cavity 111 is provided with a first top wall 1111 and a first bottom wall 1112 that are spaced apart from each other, and the first clearance groove 112 is recessed in the first bottom wall 1112; the first blade 121 is provided with a top side 1211 facing the first top wall 1111 and a bottom side 1212 facing the first bottom wall 1112, and the first limiting structure 122 protrudes from the bottom side 1212.

[0067] It should be noted that the height of the blade frame 11 is set along the vertical direction in the figure, with the first top wall 1111 located on the upper side and the first bottom wall 1112 located on the lower side. Correspondingly, the top side 1211 of the first blade 121 faces upward and the bottom side 1212 of the first blade 121 faces downward. Since the top side 1211 of the first blade 121 usually needs to install the secondary feedback structure of the radiotherapy equipment, the first limiting structure 122 needs to avoid the top side 1211 of the first blade 121. As an example, this application has the first limiting structure 122 protruding from the bottom side 1212 of the first blade 121, and the first clearance groove 112 correspondingly recessed into the first bottom wall 1112 of the first blade cavity 111. This arrangement allows the first limiting structure 122 to slide along the first clearance groove 112 for engagement with the first stop assembly 13 for limiting, and also prevents gaps from forming between the first blade 121 and adjacent blades due to the protruding first limiting structure 122, which could lead to radiation leakage.

[0068] See Figure 3 and Figure 5 In one embodiment, the first blade 121 is further provided with a front side 1213 and a tail side 1214 spaced apart along the width direction of the blade frame 11. The first limiting structure 122 is located between the front side 1213 and the tail side 1214, and the distance from the first limiting structure 122 to the front side 1213 is not less than the distance from the first limiting structure 122 to the tail side 1214.

[0069] It should be noted that the width of the blade frame 11 is set along the front-to-back direction in the figure, the front side 1213 of the first blade 121 is located in front, and the tail side 1214 of the first blade 121 is located in the rear.

[0070] In this application, the first limiting structure 122 is disposed between the front side 1213 and the rear side 1214, and the distance from the first limiting structure 122 to the front side 1213 is not less than the distance from the first limiting structure 122 to the rear side 1214. This arrangement, with the first limiting structure 122 positioned close to the rear side 1214, allows for sufficient contact distance between the first limiting structure 122 and the first stop assembly 13, thereby preventing interference with the sliding of the first blade 121.

[0071] As an example, the first limiting structure 122 protrudes from the bottom side 1212 of the first blade 121 and is disposed adjacent to the tail side 1214. At this time, in the initial position of the first blade 121, the first stop assembly 13 is located between the first limiting structure 122 and the front side 1213 of the first blade 121, and the first stop assembly 13 and the first limiting structure 122 are spaced apart along the front-back direction in the figure, so as to reserve a sliding distance for the first blade 121 and avoid excessive restriction on the sliding of the first blade 121, resulting in motion interference.

[0072] See Figures 2 to 4 In one embodiment, the orthographic projection of the first limiting structure 122 does not exceed the orthographic projection boundary of the first blade 121 along the height direction of the blade frame 11. It should be noted that the height direction of the blade frame 11 is set along the vertical direction in the figure. This application sets the orthographic projection of the first limiting structure 122 to not exceed the orthographic projection boundary of the first blade 121, which is equivalent to the first limiting structure 122 being narrower than the first blade 121 along the horizontal direction in the figure. Furthermore, the first limiting structure 122 is shorter than the first blade 121 along the front-back direction in the figure. With this configuration, when multiple first blades 121 are arranged side-by-side along the horizontal direction in the figure, adjacent first blades 121 can fit tightly together, avoiding gaps between adjacent first blades 121 caused by the protruding first limiting structure 122, thus preventing radiation leakage.

[0073] See Figure 5 In one embodiment, the first limiting structure 122 includes a protrusion protruding from the bottom side 1212, the protrusion being integrally formed with the first blade 121. This configuration creates an integral structure between the first limiting structure 122 and the first blade 121, reducing assembly steps. Simultaneously, this configuration also improves the structural strength between the first limiting structure 122 and the first blade 121, preventing the first limiting structure 122 from loosening or detaching under repeated impacts with the first stop assembly 13, thereby ensuring the reliable limiting relationship between the first limiting structure 122 and the first stop assembly 13.

[0074] In other embodiments, the bottom side 1212 of the first blade 121 is provided with a connecting hole recessed towards the top side 1211, and the first limiting structure 122 includes a connector that inserts into the connecting hole. This configuration allows the first limiting structure 122 and the first blade 121 to be assembled separately. If the first limiting structure 122 is damaged after colliding with the first stop assembly 13, the operator can flexibly replace the first limiting structure 122 without replacing the entire first blade 121, thereby reducing maintenance costs.

[0075] As an example, the first limiting structure 122 includes an open spring pin, which can be inserted into the connecting hole 1212 on the bottom side of the first blade 121. This design offers advantages: firstly, the open spring pin is a standard part, inexpensive and easy to procure, requiring no custom manufacturing; secondly, the open spring pin has a certain degree of elasticity, generating an elastic force after being inserted into the connecting hole, thus preventing loosening and improving the connection stability between the first limiting structure 122 and the first blade 121.

[0076] Of course, in other embodiments, the first limiting structure 122 also includes a threaded post, and the connecting hole of the first blade 121 can be configured as a threaded hole that mates with the threaded post. The first limiting structure 122 also includes other plug-in components such as pins and screws, which are not limited in this application. It is understood that the connecting hole of the first blade 121 can be a circular hole, a square hole, or an irregularly shaped hole, which is not limited in this application.

[0077] See Figure 4 and Figure 5 In one embodiment, the tail side 1214 is provided with a groove 1215 recessed into the front side 1213, and at least a portion of the drive assembly 14 is located in the groove 1215 and is drively connected to the first blade 121.

[0078] With this configuration, when the drive assembly 14 drives the first blade 121 to slide and retract within the first blade cavity 111, the groove 1215 on the tail side 1214 of the first blade 121 can engage with the drive assembly 14 to limit the sliding retraction distance of the first blade 121 and prevent the first blade 121 from excessively retracting and causing deformation and damage.

[0079] In addition, the present application provides a groove 1215 on the tail side 1214 of the first blade 121, which can also be used to accommodate part of the drive assembly 14 to improve the structural compactness of the multi-leaf grating 1.

[0080] See Figure 4 and Figure 5 In one embodiment, in the direction from the tail side 1214 to the front side 1213, the groove 1215 includes a first recess 1215a and a second recess 1215b connected in sequence. The drive assembly 14 includes a drive frame 141 and a drive source 142 fixed to the drive frame 141. The drive frame 141 is fixed to the blade frame 11, and at least a portion of the drive frame 141 is located within the first recess 1215a. At least a portion of the drive source 142 is located within the second recess 1215b and is drively connected to the first blade 121.

[0081] This configuration, where the drive frame 141 engages and limits the first recess 1215a, restricts the sliding retraction distance of the first blade 121, preventing excessive retraction and deformation damage. At least a portion of the drive source 142 is located within the second recess 1215b, which can serve as a drive guide rail to improve the sliding accuracy of the first blade 121 and prevent sliding deviation.

[0082] As an example, the drive source 142 includes a linear motor, the drive end of which may be disposed within the second recess 1215b. The drive source 142 may also include a rotary motor and a lead screw drive pair connected to the rotary motor, at least a portion of which may be disposed within the second recess 1215b.

[0083] See Figure 6 and Figure 7 In one embodiment, multiple first blades 121 are arranged sequentially along the length of the blade frame 11. Multiple first limiting structures 122 are arranged and correspond one-to-one with each first blade 121. Multiple first clearance grooves 112 are arranged and sequentially separated along the length of the blade frame 11. Each first limiting structure 122 and each first clearance groove 112 are slidably engaged. The first bottom wall 1112 is also provided with a first mounting groove 113, which extends through each first clearance groove 112 along the length of the blade frame 11. The first mounting groove 113 is located between the front side 1213 of each first blade 121 and each first limiting structure 122. A first stop assembly 13 is detachably installed in the first mounting groove 113, so that each first limiting structure 122 can abut or separate from the first stop assembly 13 respectively.

[0084] Understandably, a multi-leaf grating 1 typically has multiple first leaves 121 to precisely cut the irradiation field through the independent movement of the multiple first leaves 121, so that the rays emitted by the radiation source conform as closely as possible to the shape of the tumor, thereby improving treatment precision. Thus, in this application, the length direction of the leaf frame 11 is arranged along the left-right direction in the figure, and multiple first leaves 121 can be arranged sequentially in the left-right direction into the first leaf cavity 111. Correspondingly, each first leaf 121 is provided with a corresponding first limiting structure 122, and the first leaf cavity 111 is also provided with a first clearance groove 112 corresponding one-to-one with each first limiting structure 122, so that each first limiting structure 122 has an independent sliding track.

[0085] Based on this, to facilitate braking of the multiple first blades 121, this application also provides a first mounting groove 113 that runs through all the first clearance grooves 112 in a left-right direction as shown in the figure on the first bottom wall 1112. The first mounting groove 113 is located between the front side 1213 of each first blade 121 and the corresponding first limiting structure 122. With this configuration, the first stop assembly 13 only needs to be detachably installed into the first mounting groove 113 to allow the first stop assembly 13 to span all the first clearance grooves 112, thereby abutting against each of the first limiting structures 122.

[0086] Specifically, in use, the multi-leaf grating 1 provided in this application allows the driving assembly 14 to drive each first leaf 121 to independently slide out from back to front along the diagram. When a first leaf 121 drives the corresponding first limiting structure 122 to abut against the first stop assembly 13 in the first mounting groove 113, the first leaf 121 is prevented from continuing to advance, indicating that the first leaf 121 has slid out to the preset maximum stroke. The driving assembly 14 then stops driving the first leaf 121 to continue sliding to avoid the first leaf 121 from over-extending and colliding or falling off, thereby preventing deformation and damage to the first leaf 121. Similarly, since the first stop assembly 13 passes through all the first clearance grooves 112, the limiting structure of each first leaf 121 can independently abut against the first stop assembly 13, thereby achieving limiting and preventing each first leaf 121 from over-extending and colliding or falling off.

[0087] Thus, when limiting multiple first blades 121, compared to separately setting a first stop component 13 in each first clearance groove 112, this application sets a first mounting groove 113 on the first bottom wall 1112 that runs through all the first clearance grooves 112. Only one strip-shaped first stop component 13 needs to be installed in the first mounting groove 113 to limit all the first blades 121, which can significantly reduce the number of parts and assembly steps.

[0088] See Figure 6 and Figure 7 In one embodiment, the first blade cavity 111 is provided with a first sidewall 1113 and a second sidewall 1114 spaced apart along the length of the blade frame 11. The blade frame 11 is also provided with a first mounting hole 114 and a second mounting hole 115. The first mounting hole 114 penetrates the first sidewall 1113 and communicates with the first mounting groove 113, and the second mounting hole 115 penetrates the second sidewall 1114 and communicates with the first mounting groove 113. The first stop assembly 13 includes a first stop member 131 and a second stop member 132. The first stop member 131 is inserted into the first mounting groove 113 through the first mounting hole 114, and the second stop member 132 is inserted into the first mounting groove 113 through the second mounting hole 115, and the first stop member 131 and the second stop member 132 are mated together.

[0089] It should be noted that in this application, the length direction of the blade frame 11 is arranged along the left-right direction in the figure, the first sidewall 1113 is located on the left side of the figure, and the second sidewall 1114 is located on the right side of the figure. At the same time, the first sidewall 1113 has a first mounting hole 114 communicating with the first mounting groove 113, and the second sidewall 1114 has a second mounting hole 115 communicating with the second mounting groove, so that the first stop assembly 13 can be inserted into the first mounting groove 113 from the left and right sides of the blade frame 11 respectively.

[0090] Specifically, the first stop assembly 13 in this application adopts a split structure, including a first stop 131 and a second stop 132. The first stop 131 can be inserted into the first mounting groove 113 through the first mounting hole 114, and the second stop 132 can be inserted into the first mounting groove 113 through the second mounting hole 115, and the first stop 131 and the second stop 132 are fixed together. With this configuration, when each first blade 121 slides out, the first limiting structure 122 on each first blade 121 slides along its respective first clearance groove 112, and the corresponding first limiting structure 122 will abut against the continuous stop structure formed by the docking of the first stop 131 and the second stop 132, thereby blocking the corresponding first blade 121 and achieving the limiting. When the operator needs to disassemble and maintain each first blade 121, he / she only needs to pull out the first stop 131 and / or the second stop 132 from the left and right sides of the blade frame 11 respectively to release the restriction on the first blade 121, and then pull out the corresponding first blade 121 from the first blade cavity 111.

[0091] Thus, compared to inserting an integral strip-shaped stop into the first mounting groove 113 from one end of the blade frame 11, this application sets the first stop assembly 13 as a first stop 131 and a second stop 132 assembled separately, and inserts them into the first mounting groove 113 from the mounting holes on the left and right sides of the blade frame 11, respectively. This can reduce the length of a single stop, which can reduce both the assembly difficulty and the processing difficulty of a single stop.

[0092] Understandably, the plurality of first blades 121 include a first intermediate blade, a first side blade, and a second side blade. The first side blade and the second side blade are separated on both sides of the first intermediate blade. The first side blade is disposed near the first sidewall 1113, and the second side blade is disposed near the second sidewall 1114. The first limiting structure 122 on the first side blade can abut or separate from the first stop 131. The first limiting structure 122 on the second side blade can abut or separate from the second stop 132. The first limiting structure 122 on the first intermediate blade can abut or separate from the first stop 131, the second stop 132, or the mating position 133 of the first stop 131 and the second stop 132. This application does not impose any limitations on this.

[0093] See Figures 7 to 9 In one embodiment, the first stop 131 and the second stop 132 are inserted into each other along the length of the blade frame 11. This arrangement increases the connection area at the mating point of the first stop 131 and the second stop 132, thereby improving the connection stability of the first stop 131 and the second stop 132. This prevents the two stops from frequently abutting against the first limiting structure 122 and causing misalignment, which would allow the first limiting structure 122 to pass through the misalignment gap, resulting in the failure of the first set of stop components. At the same time, this arrangement also allows the first stop 131 and the second stop 132 to restrain each other, preventing the mating point of the first stop 131 and the second stop 132 from warping and interfering with the sliding of the first blade 121.

[0094] As an example, the first stop 131 has a recessed slot 1315 on the side facing the second stop 132, and the second stop 132 has a protruding insert 1325 on the side facing the first stop 131. After the first stop 131 and the second stop 132 are respectively inserted into the first mounting groove 113, the insert 1325 and the slot 1315 are aligned. Figure 7 The two parts are inserted in the left and right directions so that the first stop 131 and the second stop 132 are connected to each other to form a whole.

[0095] In other embodiments, the first stop 131 and the second stop 132 can also be connected by magnetic attraction, which is not a limitation of this application.

[0096] See Figures 7 to 9 In one embodiment, in the direction from the first sidewall 1113 to the second sidewall 1114, the height of the first stop 131 gradually decreases and the height of the second stop 132 gradually increases, and the docking position 133 of the first stop 131 and the second stop 132 is located at the middle position between the first sidewall 1113 and the second sidewall 1114.

[0097] It should be noted that the top side 1211 of each first leaf 121 needs to be coordinated with the secondary feedback structure of the radiotherapy equipment. Therefore, the top side 1211 of each first leaf 121 is usually set at the same height. At the same time, the multi-leaf grating 1 also needs to be set with a focusing target point, so the bottom side 1212 of each first leaf 121 is combined to form an arc or inclined surface. Among them, along the direction from top to bottom in the figure, the lowest point of the arc or inclined surface formed by the bottom side 1212 of each first leaf 121 is located at the middle position between the first sidewall 1113 and the second sidewall 1114.

[0098] Based on this, to ensure that the first limiting structure 122 on each first blade 121 can abut against the first stop assembly 13 to form a limiting action, this application sets the first stop assembly 13 to conform to the curve of the bottom side 1212 of each first blade 121. As an example, along the direction from left to right in the figure, the height of the first stop 131 gradually decreases, and the height of the second stop 132 gradually increases. With this setting, the mating position 133 of the first stop 131 and the second stop 132 is located in the middle of the first side wall 1113 and the second side wall 1114, which corresponds exactly to the lowest point of the arc or slope formed by the combination of the bottom sides 1212 of each first blade 121. This allows the first stop assembly 13 to conform to the curve of the bottom side 1212 of each first blade 121, thereby enabling the first limiting structure 122 on each first blade 121 to abut against the first stop assembly 13 to form an effective limiting action.

[0099] As an example, the first stop 131 has a first top surface 1311 facing the first top wall 1111, and the second stop 132 has a second top surface 1321 facing the first top wall 1111. In the direction from the first side wall 1113 to the second side wall 1114, the bottom side 1212 of each first blade 121 abuts against the first top surface 1311 and the second top surface 1321 in sequence. The first top surface 1311 and the second top surface 1321 are respectively configured as inclined surfaces or curved surfaces, and the inclination direction of the first top surface 1311 is opposite to the inclination direction of the second top surface 1321. With this configuration, the bottom side 1212 of some first blades 121 near the first side wall 1113 can respectively fit against the first top surface 1311, and the bottom side 1212 of some first blades 121 near the second side wall 1114 can respectively fit against the second top surface 1321. When the first stop 131 and the second stop 132 are connected, the first top surface 1311 and the second top surface 1321 can be connected to form a “V” or “U” shape to match the inclined or arc-shaped shape formed by the bottom side 1212 of each first blade 121.

[0100] See Figure 7 and Figure 8In one embodiment, the first stop 131 includes a first sealing portion 1312 and a first stop portion 1313 connected to the first sealing portion 1312. At least a portion of the first sealing portion 1312 protrudes beyond the first mounting hole 114 and blocks the first mounting hole 114. The first stop portion 1313 extends along the length of the blade frame 11 and is located within the first mounting groove 113. This configuration allows the first sealing portion 1312 to shield the first mounting hole 114, sealing it against dust and preventing radiation leakage. The first stop portion 1313 engages with the first limiting structure 122 on each first blade 121 to limit the movement of each first blade 121.

[0101] Understandably, the first sealing part 1312 and the first stop part 1313 can be integrally formed or connected separately, and this application does not impose any restrictions.

[0102] Meanwhile, the first sealing part 1312 may protrude at least partially beyond the first mounting hole 114. The protruding part of the first sealing part 1312 can be grasped by the operator so that the operator can pull out and disassemble the first stop 131 from the first mounting groove 113.

[0103] Similarly, see Figure 7 and Figure 9 In one embodiment, the second stop 132 includes a second sealing portion 1322 and a second stop portion 1323 connected to the second sealing portion 1322. At least a portion of the second sealing portion 1322 protrudes beyond the second mounting hole 115 and blocks the second mounting hole 115. The second stop portion 1323 extends along the length of the blade frame 11 and is located within the first mounting groove 113. This configuration allows the second sealing portion 1322 to shield the second mounting hole 115, sealing it against dust and preventing radiation leakage. The second stop portion 1323 engages with the first limiting structure 122 on each first blade 121 to limit the movement of each first blade 121.

[0104] Understandably, the second sealing part 1322 and the second stop part 1323 can be integrally formed or connected separately, and this application does not impose any restrictions.

[0105] Meanwhile, the second sealing part 1322 may protrude at least partially beyond the second mounting hole 115. The protruding part of the second sealing part 1322 can be grasped by the operator so that the operator can pull out and disassemble the second stop 132 from the first mounting groove 113.

[0106] In other embodiments, threaded holes may be provided on the first sealing part 1312 and the second sealing part 1322 respectively, so that the first sealing part 1312 can be fixedly connected to the blade frame 11 by installing a threaded connector, and the second sealing part 1322 can also be fixedly connected to the blade frame 11 by installing a threaded connector, thereby improving the connection reliability between the first stop 131 and the second stop 132 and the blade frame 11 respectively, so as to prevent the first stop assembly 13 from being repeatedly abutted, impacted and moved by the first limiting structure 122.

[0107] See Figures 7 to 9 In one embodiment, the first stop portion 1313 is provided with a first buffer layer 1314 for abutting against the first limiting structure 122, and / or the second stop portion 1323 is provided with a second buffer layer 1324 for abutting against the first limiting structure 122.

[0108] Understandably, the first buffer layer 1314 is disposed on the side of the first stop portion 1313 facing the first limiting structure 122. The first buffer layer 1314 can be fixed to the surface of the first stop portion 1313 by means of coating, pasting, vulcanization, embedding, injection molding, or fitting, and the first buffer layer 1314 is an elastic material layer. With this configuration, when the first limiting structure 122 abuts against the first stop portion 1313, the first limiting structure 122 can first contact the first buffer layer 1314 to form a flexible connection, so as to avoid rigid contact between the first limiting structure 122 and the first stop portion 1313. Thus, the first buffer layer 1314 can buffer the impact force of the first limiting structure 122 on the first stop portion 1313, which can effectively prevent the first limiting structure 122 and the first stop portion 1313 from deforming and being damaged due to impact, and can also reduce the impact noise, reducing auditory interference and psychological stress to patients and operators. In addition, the first buffer layer 1314 can also increase the friction between itself and the first limiting structure 122 to improve the braking and limiting effect on the first limiting structure 122.

[0109] Similarly, the second buffer layer 1324 is disposed on the side of the second stop portion 1323 facing the first limiting structure 122. The second buffer layer 1324 can be fixed to the surface of the second stop portion 1323 by means of coating, pasting, vulcanization, embedding, injection molding or fitting, etc., and the second buffer layer 1324 is an elastic material layer, which will not be described in detail in this application.

[0110] As an example, the first buffer layer 1314 and / or the second buffer layer 1324 may include a rubber layer, a silicone layer, a latex layer or a sponge layer, etc., and this application does not impose any limitations.

[0111] See Figure 10In one embodiment, the first bottom wall 1112 is further provided with a plurality of first guide grooves 116 arranged sequentially along the length direction of the blade frame 11. Each first guide groove 116 extends along the width direction of the blade frame 11, and each first blade 121 slides in correspondence with each first guide groove 116. Each first guide groove 116 is recessed with a first clearance groove 112, and a first mounting groove 113 extends through each first guide groove 116 along the length direction of the blade frame 11.

[0112] With this configuration, each first guide groove 116 is set in a one-to-one correspondence with each first blade 121. Each first guide groove 116 can form an independent slide for each first blade 121, allowing each first blade 121 to reciprocate along its respective first guide groove 116, thereby avoiding motion interference.

[0113] In addition, the first mounting groove 113 not only penetrates each of the first clearance grooves 112, but also penetrates each of the first guide grooves 116 along the length of the blade frame 11, so as to facilitate the installation of the first stop assembly 13.

[0114] As an example, the first clearance groove 112 may be recessed into the bottom wall of the first guide groove 116 so that the first blade 121 and the first limiting structure 122 protruding on the first blade 121 can be sequentially installed into the first guide groove 116 and the first clearance groove 112.

[0115] See Figure 11 and Figure 12 In one embodiment, the blade frame 11 further includes a second blade cavity 117 and a second clearance groove 118. The second blade cavity 117 is separated from the first blade cavity 111 along the height direction of the blade frame 11. The second clearance groove 118 is located within the second blade cavity 117 and extends along the width direction of the blade frame 11. The multi-leaf grating 1 also includes a second grating assembly 15 and a second stop assembly 16. The second grating assembly 15 includes a second blade and a second limiting structure protruding from the second blade. The second blade is slidably disposed within the second blade cavity 117 along the width direction of the blade frame 11. The second limiting structure is slidably engaged with the second clearance groove 118. The second stop assembly 16 is detachably disposed within the second clearance groove 118. The drive assembly 14 is also connected to the second blade, enabling the second blade to drive the second limiting structure to reciprocate along the second clearance groove 118, so that the second limiting structure abuts against or separates from the second stop assembly 16.

[0116] It should be noted that the height of the blade frame 11 is set along the vertical direction in the figure, and the first blade cavity 111 and the second blade cavity 117 are separated along the vertical direction, with the first blade cavity 111 located in the upper layer and the second blade cavity 117 located in the lower layer. The first grating assembly 12 is slidably disposed in the first blade cavity 111, and the second grating assembly 15 is slidably disposed in the second blade cavity 117, so that the multi-leaf grating 1 provided in this application has a double-layer blade assembly. This arrangement, on the one hand, allows the double-layer blade assembly to adapt to complex tumor shapes, thereby improving treatment accuracy. On the other hand, the second grating assembly 15 can also shield the rays transmitted through the first grating assembly 12 to prevent ray leakage.

[0117] Similarly, to prevent the second grating assembly 15 from overextending and colliding or falling off, the second grating assembly 15 includes a second blade and a second limiting structure protruding from the second blade. The second blade cavity 117 is also provided with a second clearance groove 118, and a detachable second stop assembly 16 is provided in the second clearance groove 118. When the driving assembly 14 drives the second blade to slide out of the second blade cavity 117, the second blade can also simultaneously drive the second limiting structure to slide in the second clearance groove 118 until the second limiting structure abuts against the second stop assembly 16. This indicates that the second blade has slid into place and cannot continue to slide in the same direction, thereby limiting the sliding distance of the second blade to avoid collision or falling off with the opposite blade. Of course, the second stop assembly 16 is also detachable to facilitate the disassembly and maintenance of the second blade by the operator, which will not be described in detail in this application.

[0118] Understandably, the second blade can be driven by the drive assembly 14 to slide out of the second blade cavity 117 or slide back into the second blade cavity 117, and this application does not impose any restrictions.

[0119] Furthermore, the first blade 121 and the second blade can move independently, and the first blade 121 and the second blade can also be driven by different drive components 14 respectively, which is not limited in this application.

[0120] See Figure 11 and Figure 12 In one embodiment, along the height direction of the blade frame 11, the second blade cavity 117 is provided with a second top wall 1171 and a second bottom wall 1172 that are spaced apart from each other, and a second clearance groove 118 is recessed in the second top wall 1171. In the direction from the second bottom wall 1172 to the second top wall 1171, a second limiting structure protrudes from the side of the second blade facing the second top wall 1171.

[0121] It should be noted that the height of the blade frame 11 is set along the vertical direction in the figure, with the second top wall 1171 located above and the second bottom wall 1172 located below. The second clearance groove 118 is recessed in the second top wall 1171. With this configuration, the second limiting structure can protrude from the side of the second blade facing the second top wall 1171, so as to make full use of the top space of the second blade cavity 117 and avoid occupying the bottom space of the second blade cavity 117.

[0122] Similarly, the second top wall 1171 can also be provided with a second mounting groove that runs through all the second clearance grooves 118 in the left-right direction shown in the figure, and the second stop assembly 16 can be installed into the second mounting groove. In addition, the left and right side walls of the second blade cavity 117 are also provided with third mounting holes 119 that communicate with the second mounting groove, so that the second stop assembly 16 can be inserted into the second mounting groove from the left and right sides of the second blade cavity 117.

[0123] According to a second aspect of the embodiments of this application, this application also provides a radiotherapy device, including the multileaf grating 1 of any of the above embodiments.

[0124] During use, the radiotherapy equipment provided in this application allows the control system to activate the drive assembly 14 based on the shape of the tumor target area, driving the first grating assembly 12 to slide out or retract within the first leaf cavity 111. During the sliding extension of the first grating assembly 12, the first leaf 121 drives the first limiting structure 122 to slide within the first clearance groove 112, approaching the first stop assembly 13, until the first limiting structure 122 abuts against the first stop assembly 13, preventing the first leaf 121 from continuing to move. This indicates that the first leaf 121 has reached the preset maximum extension position, at which point the drive assembly 14 stops driving, preventing the first leaf 121 from colliding with or sliding off the opposite leaf due to overextension. This effectively prevents deformation and damage to the first leaf 121, thereby reducing the replacement and maintenance costs. Simultaneously, because this application can prevent deformation and damage to the first leaf 121, the geometric accuracy of the irregular radiation field formed by the multi-leaf grating 1 can be guaranteed, preventing beam leakage from damaging surrounding normal tissue and thus improving the therapeutic effect of the radiotherapy equipment.

[0125] According to a third aspect of the embodiments of this application, this application also provides a method for disassembling the blades of a multi-leaf grating, wherein the multi-leaf grating 1 includes the multi-leaf grating of any of the above embodiments. The blade disassembly method includes: Remove the first stop assembly 13 inside the first clearance groove 112; The first blade 121 is extracted along the width direction of the blade frame 11, so that the first blade 121 slides out from the first blade cavity 111.

[0126] It should be noted that after prolonged use of the multi-leaf grating 1, the first leaf 121 may wear out, requiring timely replacement by the operator to ensure the geometric accuracy of the firing field. When maintaining or replacing the first leaf 121, the operator first pulls the first stop assembly 13 out of the first clearance groove 112, opening both the front and rear sides of the first clearance groove 112. Then, the operator simply pulls the first leaf 121 to be replaced out of the first leaf cavity 111, allowing the first limiting structure 122 to slide smoothly out of the first clearance groove 112, thus removing the first leaf 121. This design allows the operator to quickly, non-destructively, and easily remove and replace the first leaf 121 without additionally removing the leaf frame 11 or the drive assembly 14.

[0127] In one embodiment, multiple first blades 121 are provided along the direction from the first sidewall 1113 of the first blade cavity 111 to the second sidewall 1114, including a first side blade, a first intermediate blade, and a second side blade in sequence. The first stop assembly 13 includes a first stop 131 and a second stop 132 that abut against each other. The first limiting structure 122 on the first side blade can abut against the first stop 131 for limiting, the first limiting structure 122 on the second side blade can abut against the second stop 132 for limiting, and the limiting structure on the first intermediate blade can abut against the first stop 131 for limiting, or abut against the second stop 132 for limiting, or abut against the abutment position 133 of the first stop 131 and the second stop 132 for limiting.

[0128] As an example, when an operator disassembles the first side blade, the operator can pull out the first stop 131 from the first mounting hole 114, causing the first stop 131 to move along the second side wall 1114 towards the first side wall 1113 to avoid the first side blade. Specifically, the operator first locates the position of the first stop 131 on the outer side of the first side wall 1113. The operator then grips the first sealing part 1312 with their hand or a tool and applies a pulling force to the first stop 131 in the pulling direction, causing the first stop 131 to gradually slide out of the first mounting hole 114. Depending on the operator's disassembly requirements, the operator can pull out only a short distance of the first stop 131, ensuring that the first stop 131 no longer covers the first clearance groove 112 corresponding to the first side blade; it is not necessary to completely pull out the entire first stop 131 from the first mounting hole 114. At this point, the portion of the first mounting groove 113 corresponding to the first side blade becomes a cavity, completely opening the removal path of the first limiting structure 122 on the first side blade within the first clearance groove 112. Afterwards, the operator only needs to pull the first side blade out of the first blade cavity 111 along the width direction of the blade frame 11, allowing the corresponding first limiting structure 122 to slide out of the first clearance groove 112 without obstruction, thus completing the disassembly of the first side blade.

[0129] With this configuration, when replacing or maintaining the first side blade, the operator does not need to disassemble the second stop 132. They only need to activate the first stop 131 to quickly, non-destructively, and easily disassemble the first side blade, thus improving the maintenance efficiency of the multi-leaf grating 1 for the blades.

[0130] Similarly, as an example, when an operator disassembles the second side blade, the operator can pull out the second stop 132 from the second mounting hole 115, causing the second stop 132 to move along the direction from the first side wall 1113 to the second side wall 1114 to avoid the second side blade. Specifically, the operator first locates the position of the second stop 132 on the outer side of the second side wall 1114. The operator then grips the second sealing part 1322 with their hand or a tool and applies a pulling force to the second stop 132 in the pulling direction, causing the second stop 132 to gradually slide out of the second mounting hole 115. Depending on the operator's disassembly requirements, the operator can pull out only a short distance of the second stop 132, as long as it is ensured that the second stop 132 no longer covers the first clearance groove 112 corresponding to the second side blade; it is not necessary to completely pull out the entire second stop 132 from the second mounting hole 115. At this point, the portion of the first mounting groove 113 corresponding to the second side blade becomes a cavity, completely opening the removal path of the first limiting structure 122 on the second side blade within the first clearance groove 112. Afterwards, the operator only needs to pull the second side blade out of the first blade cavity 111 along the width direction of the blade frame 11, allowing the corresponding first limiting structure 122 to slide out of the first clearance groove 112 without obstruction, thus completing the disassembly of the second side blade.

[0131] With this configuration, when replacing or maintaining the second side blade, the operator does not need to disassemble the first stop 131. They only need to operate the second stop 132 to quickly, non-destructively, and easily disassemble the second side blade, thus improving the maintenance efficiency of the multi-leaf grating 1 for the blades.

[0132] Similarly, as an example, when the operator disassembles the first intermediate blade, the operator can remove the first stop 131 in the first mounting hole 114, so that the first stop 131 moves along the second side wall 1114 in the direction of the first side wall 1113, and remove the second stop 132 in the second mounting hole 115, so that the second stop 132 moves along the first side wall 1113 in the direction of the second side wall 1114, so as to avoid the first intermediate blade.

[0133] Understandably, the first intermediate blade is usually located at the mating position 133 of the first stop 131 and the second stop 132. When the operator replaces or repairs the first intermediate blade, the operator needs to disassemble the first stop 131 and the second stop 132 respectively to separate the first stop 131 and the second stop 132, thereby avoiding the disassembly of the first intermediate blade.

[0134] Specifically, the operator first locates the first stop 131 on the outer side of the first sidewall 1113. The operator then grips the first sealing part 1312 with their hand or a tool and applies a pulling force to the first stop 131 in the pulling direction, causing it to gradually slide out of the first mounting hole 114 and separate from the second stop 132. Next, the operator locates the second stop 132 on the outer side of the second sidewall 1114. The operator grips the second sealing part 1322 with their hand or a tool and applies a pulling force to the second stop 132 in the pulling direction, causing it to gradually slide out of the second mounting hole 115 and further separate from the first stop 131. Afterwards, depending on the operator's disassembly requirements, it is sufficient to ensure that the first stop 131 and the second stop 132 no longer cover the first clearance groove 112 corresponding to the first intermediate blade. At this point, the portion of the first mounting groove 113 corresponding to the first intermediate blade becomes a cavity, completely opening the removal path of the first limiting structure 122 on the first intermediate blade within the first clearance groove 112. Afterwards, the operator only needs to pull the first intermediate blade out of the first blade cavity 111 along the width direction of the blade frame 11, allowing the corresponding first limiting structure 122 to slide out of the first clearance groove 112 without obstruction, thus completing the disassembly of the first intermediate blade.

[0135] Thus, when replacing or maintaining the first blade 121, the operator only needs to remove the corresponding stop to quickly, non-destructively, and easily disassemble the first blade 121 without having to disassemble the blade frame 11 or the drive assembly 14, thereby improving the maintenance efficiency of the multi-leaf grating 1 for the blades and reducing maintenance costs.

[0136] 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 grating, characterized in that, include: The blade frame has a first blade cavity and a first clearance groove located in the first blade cavity, the first clearance groove extending along the width direction of the blade frame; The first clearance groove is provided in multiple ways, and the multiple first clearance grooves are separated along the length direction of the blade frame; the blade frame is also provided with a first mounting groove that passes through each first clearance groove along the length direction of the blade frame. The first grating assembly includes at least one first blade and at least one first limiting structure. Each first limiting structure is correspondingly provided with each first blade and protrudes from each first blade. Each first blade is slidably provided in the first blade cavity along the width direction of the blade frame. Each first limiting structure is slidably engaged with each first clearance groove. The first stop assembly includes a first stop and a second stop disposed opposite to each other along the length direction of the blade frame. The first stop and the second stop are respectively located in the first mounting groove and are mated to each other. Along the length direction of the blade frame, the first stop and the second stop sequentially limit the movement of each first limiting structure. The drive assembly is connected to each first blade in a transmission manner, so that each first blade can drive its respective first limiting structure to slide back and forth along the corresponding first clearance groove, so that each first limiting structure can abut or separate from the first stop assembly. The first blade cavity is provided with a first sidewall and a second sidewall spaced apart along the length of the blade frame. In the direction from the first sidewall to the second sidewall, the height of the first stop gradually decreases and the height of the second stop gradually increases. The docking position of the first stop and the second stop is located at the middle position between the first sidewall and the second sidewall.

2. The multi-leaf grating according to claim 1, characterized in that, Along the height direction of the blade frame, the first blade cavity is provided with a first top wall and a first bottom wall that are spaced apart from each other, and the first clearance groove is recessed in the first bottom wall; the first blade is provided with a top side facing the first top wall and a bottom side facing the first bottom wall, and the first limiting structure protrudes from the bottom side.

3. The multi-leaf grating according to claim 2, characterized in that, The first blade is further provided with a front side and a tail side spaced apart along the width direction of the blade frame. The first limiting structure is located between the front side and the tail side, and the distance from the first limiting structure to the front side is not less than the distance from the first limiting structure to the tail side.

4. The multi-leaf grating according to claim 3, characterized in that, Along the height direction of the blade frame, the orthographic projection of the first limiting structure does not exceed the orthographic projection boundary of the first blade.

5. The multi-leaf grating according to claim 3, characterized in that, The first limiting structure includes a protrusion protruding from the bottom side, and the protrusion is integrally formed with the first blade; Alternatively, the bottom side is provided with a connecting hole recessed towards the top side, and the first limiting structure includes a connector that is inserted into the connecting hole.

6. The multi-leaf grating according to claim 3, characterized in that, The tail side is provided with a groove that is recessed towards the front side, and at least a portion of the drive assembly is located within the groove and is drively connected to the first blade.

7. The multi-leaf grating according to claim 6, characterized in that, In the direction from the tail side to the front side, the groove includes a first recess and a second recess connected in sequence; the drive assembly includes a drive frame and a drive source fixed to the drive frame, the drive frame is fixed to the blade frame, and at least a portion of the drive frame is located in the first recess, and at least a portion of the drive source is located in the second recess and is drively connected to the first blade.

8. The multi-leaf grating according to claim 3, characterized in that, The first mounting groove is disposed on the first bottom wall, and the first mounting groove is located between the front side of each first blade and each first limiting structure.

9. The multi-leaf grating according to claim 8, characterized in that, The blade frame is further provided with a first mounting hole and a second mounting hole. The first mounting hole penetrates the first sidewall and communicates with the first mounting groove, and the second mounting hole penetrates the second sidewall and communicates with the first mounting groove. The first stop is inserted into the first mounting groove through the first mounting hole, and the second stop is inserted into the first mounting groove through the second mounting hole, with the first stop and the second stop mating with each other.

10. The multi-leaf grating according to claim 9, characterized in that, The first stop and the second stop are inserted into each other along the length of the blade frame; or, the first stop and the second stop are connected by magnetic attraction.

11. The multi-leaf grating according to claim 9, characterized in that, The first stop member has a first top surface facing the first top wall, and the second stop member has a second top surface facing the first top wall; in the direction from the first side wall to the second side wall, the bottom side of each first blade abuts against the first top surface and the second top surface in sequence.

12. The multi-leaf grating according to claim 11, characterized in that, The first top surface and the second top surface are respectively set as inclined surfaces or curved surfaces, and the inclination direction of the first top surface is opposite to the inclination direction of the second top surface.

13. The multi-leaf grating according to claim 9, characterized in that, The first stop includes a first blocking part and a first stop part connected to the first blocking part. At least a portion of the first blocking part protrudes outside the first mounting hole and blocks the first mounting hole. The first stop part extends along the length direction of the blade frame and is located in the first mounting groove. And / or, the second stop includes a second blocking portion and a second stop portion connected to the second blocking portion, at least a portion of the second blocking portion protruding outside the second mounting hole and blocking the second mounting hole, and the second stop portion extending along the length direction of the blade frame and located within the first mounting groove.

14. The multi-leaf grating according to claim 13, characterized in that, The first stop portion is provided with a first buffer layer for abutting against the first limiting structure, and / or the second stop portion is provided with a second buffer layer for abutting against the first limiting structure.

15. The multi-leaf grating according to claim 14, characterized in that, The first buffer layer and / or the second buffer layer respectively include a rubber layer, a silicone layer, a latex layer, a polyurethane layer, or a sponge layer.

16. The multi-leaf grating according to claim 8, characterized in that, The first bottom wall is also provided with a plurality of first guide grooves arranged sequentially along the length direction of the blade frame. Each first guide groove extends along the width direction of the blade frame, and each first blade slides in correspondence with each first guide groove. Each first guide groove is recessed with a first clearance groove, and the first mounting groove also penetrates each first guide groove along the length direction of the blade frame.

17. The multi-leaf grating according to any one of claims 1 to 16, characterized in that, The blade frame is further provided with a second blade cavity and a second clearance groove. The second blade cavity is separated from the first blade cavity along the height direction of the blade frame, and the second clearance groove is located in the second blade cavity and extends along the width direction of the blade frame. The multi-leaf grating further includes a second grating assembly and a second stop assembly. The second grating assembly includes a second leaf and a second limiting structure protruding from the second leaf. The second leaf is slidably disposed in the second leaf cavity along the width direction of the leaf frame. The second limiting structure is slidably engaged with the second clearance groove. The second stop assembly is detachably disposed in the second clearance groove. The drive assembly is also connected to the second blade, enabling the second blade to drive the second limiting structure to slide back and forth along the second clearance groove, so that the second limiting structure abuts against or separates from the second stop assembly.

18. The multi-leaf grating according to claim 17, characterized in that, Along the height direction of the blade frame, the second blade cavity is provided with a second top wall and a second bottom wall that are spaced apart from each other, and the second clearance groove is recessed in the second top wall; along the direction from the second bottom wall to the second top wall, the second limiting structure protrudes from the side of the second blade facing the second top wall.

19. A radiotherapy device, characterized in that, Includes the multileaf grating as described in any one of claims 1 to 18.

20. A method for disassembling the blades of a multi-leaf grating, characterized in that, The multi-leaf grating includes the multi-leaf grating according to any one of claims 1 to 18, and the method includes: Remove the first stop assembly inside the first clearance groove; The first blade is extracted along the width direction of the blade frame, so that the first blade slides out of the first blade cavity.

21. The blade disassembly method according to claim 20, characterized in that, The first blade cavity has a first sidewall and a second sidewall spaced apart along the length of the blade frame; in the direction from the first sidewall to the second sidewall, multiple first blades are provided, including a first side blade, a first middle blade, and a second side blade in sequence; multiple first clearance slots are provided and are provided one-to-one with multiple first blades; the first blade cavity also has a first mounting slot penetrating each of the first clearance slots; the first sidewall has a first mounting hole communicating with the first mounting slot; the second sidewall has a second mounting hole communicating with the first mounting slot; the first stop assembly includes a first stop member and a second stop member that are mated to each other; the first stop member is inserted into the first mounting slot through the first mounting hole; the second stop member is inserted into the first mounting slot through the second mounting hole. The removal of the first stop assembly within the first clearance groove includes: When the first side blade is disassembled, the first stop is pulled out of the first mounting hole, and the first stop is moved along the second side wall in the direction of the first side wall to avoid the first side blade. When the second side blade is disassembled, the second stop is pulled out of the second mounting hole, and the second stop is moved along the first side wall in the direction of the second side wall to avoid the second side blade. When the first intermediate blade is disassembled, the first stop in the first mounting hole is pulled out, and the first stop is moved along the second sidewall in the direction pointing to the first sidewall. The second stop in the second mounting hole is also pulled out, and the second stop is moved along the first sidewall in the direction pointing to the second sidewall to avoid the first intermediate blade.

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