Hanging combined type all-directional anti-scattering shielding system special for head and neck radiotherapy

Abstract

The invention discloses a suspension combined type omnibearing anti-scattering shielding system special for head and neck radiotherapy, and belongs to the technical field of medical instruments. The system adopts a suspension type modular structure and comprises paired suspension base assemblies, a top folded plate shielding cover assembly and a bottom anti-backfire shielding assembly, the hanging base assembly is anchored in positioning holes in the two sides of the smooth carbon fiber radiotherapy bed in a lossless mode through a specially-made overturning type T-shaped locking mechanism, and the locking mechanism can achieve switching of insertion and locking through one-hand lifting operation. The top folded plate shielding cover assembly is mounted on the base in an inserting manner; the bottom anti-backfire shielding assembly is hung below the bed board through a sliding rail; on the premise that the body of the patient is not contacted and the patient is not pressed, the three-dimensional shielding ring surrounding the non-target-area trunk of the patient is constructed, the problems that traditional lead clothes are heavy in weight, cannot protect backscattered rays and are difficult to be stably installed on a smooth bed are solved, and the radiation risk of the patient is remarkably reduced.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, specifically relating to a radiation shielding system for head and neck radiotherapy. This invention is particularly suitable for radiotherapy of head and neck malignancies such as nasopharyngeal carcinoma, laryngeal carcinoma, and oral cancer, aiming to provide comprehensive radiation protection for the non-target torso area of ​​the patient. Background Technology

[0002] Radiotherapy is one of the main treatment methods for head and neck malignant tumors. During treatment, to ensure the accuracy of target dose delivery and the repeatability of body position, the patient is usually supine and fixed on a carbon fiber radiotherapy bed, with the head precisely fixed by a thermoplastic mask. The specific type of radiotherapy bed targeted by this invention has the structural features of a smooth surface, no side guide rails, and pre-set spacing positioning holes (or arrayed positioning holes) along the longitudinal direction of both sides.

[0003] However, the following significant technical challenges exist in current clinical practice: 1. Risk of radiation exposure to non-target areas: During treatment, radiation leaks from the treatment head, collimator scattering, and ambient radiation can accumulate in the patient's trunk below the clavicle. Long-term accumulation of non-target area doses in radiation-sensitive organs such as the thyroid, breast, lungs, and gonads can significantly increase the risk of developing a second primary cancer, which is particularly serious for younger patients with a longer expected survival.

[0004] 2. Existing protective measures are rudimentary and inefficient: Clinically, lead aprons are often used to directly cover patients. This method has obvious drawbacks: ① They are heavy, causing discomfort to patients and affecting their breathing and compliance with treatment; ② They only provide one-way protection from above and cannot block backscattered rays that penetrate the bed board; ③ The edges cannot fit tightly against the body surface, leaving blind spots; ④ The placement is difficult to standardize, resulting in poor consistency in protection.

[0005] 3. Difficulty in installing smooth carbon fiber beds and space limitations: Smooth carbon fiber beds lack traditional guide rails, making it difficult to securely install conventional clamping devices and easily damaging the expensive carbon fiber bed surface. In addition, the treatment gantry needs to rotate at multiple angles, and if the external devices are too large or have an improperly designed profile, collision accidents are very likely to occur.

[0006] Therefore, developing a shielding system that can provide all-around protection without compressing the patient and can be installed securely and without damage on a smooth radiotherapy bed is an urgent clinical need. Summary of the Invention

[0007] In view of the shortcomings of existing head and neck tumor radiotherapy protection technologies, such as lead aprons pressing on patients, inability to protect against backscattered radiation, difficulty in stable installation on smooth carbon fiber beds, and the risk of equipment collision, this invention aims to provide an innovative combined all-round anti-scattering shielding system.

[0008] To achieve the above objectives, the present invention adopts the following technical solution. This invention provides a suspended, combined, omnidirectional anti-scattering shielding system specifically for head and neck radiotherapy, comprising a suspension base assembly, a radiotherapy bed, a folded plate shield assembly, a back-radiation shield assembly, an anchoring mechanism, and a rigid support frame. The suspension base assemblies are arranged in pairs and installed on both sides of the radiotherapy bed. A folded plate shield assembly is disposed on top of the radiotherapy bed, spanning across the paired suspension base assemblies. The back-radiation shield assembly is suspended below the suspension base assemblies. The suspension base assemblies, the folded plate shield assembly, and the back-radiation shield assembly are interconnected. The suspension base assembly is provided with an anchoring mechanism for fixing to the radiotherapy bed, allowing the entire system to be suspended and fixed without contacting the patient's body.

[0009] Preferably, the main body of the suspension base assembly has a stepped structure, comprising from top to bottom: an upper pressure plate, a vertical connecting plate, and a load-bearing interface. The upper pressure plate is configured to fit against the upper surface of the radiotherapy bed. The vertical connecting plate connects to the upper pressure plate and extends downward. The load-bearing interface is located at the lower end of the vertical connecting plate. The bottom surface of the upper pressure plate is provided with a flexible buffer layer, and the upper pressure plate is provided with at least one anchoring node along its length, with the anchoring mechanism installed at each anchoring node.

[0010] Preferably, the anchoring mechanism is a flip-type T-shaped locking mechanism, which includes: a hollow shaft, a flip beam, a locking drive, and an unlocking component. The hollow shaft is vertically inserted through the upper pressure plate; the flip beam is hinged to the lower end of the hollow shaft and has a vertically retracted state and a horizontally extended state; the locking drive is threaded to the upper end of the hollow shaft and is configured to drive the hollow shaft to move upward to clamp the flip beam onto the radiotherapy bed; the unlocking component is inserted inside the hollow shaft and connected to the flip beam, and is configured to control the flip beam to switch between the vertically retracted state and the horizontally extended state; when in the locked state, the radiotherapy bed is clamped between the upper pressure plate and the flip beam in the horizontally extended state.

[0011] Preferably, the bearing interface includes: an outer slot and an inner bearing beam. The outer slot is located on the outer side of the vertical connecting plate and is used to receive the bottom end of the side wall of the fixed folding plate shield assembly. The inner bearing beam is located on the inner side of the vertical connecting plate and extends horizontally towards the center of the radiotherapy bed to form a slide rail for suspending the bottom back-radiation shield assembly.

[0012] Preferably, the folded shield assembly has a multi-segmented cross-sectional shape, including: a top portion, a side skirt, and a chamfered transition section. The top portion is horizontally positioned; the side skirt is vertically positioned and connected to the suspension base assembly; the chamfered transition section connects the top portion and the side skirt; the chamfered transition section is configured with an inclination angle to provide a collision avoidance clearance when the radiotherapy gantry rotates.

[0013] Preferably, the rigid support frame includes: an end frame and a reinforcing rib. The end frame is disposed at the front and rear opening ends of the folded plate shield assembly, and its shape is adapted to the cross-sectional shape of the folded plate shield assembly. The reinforcing rib is disposed on the inner side of the bend corner of the chamfered transition section, and the reinforcing rib is used to enhance the rigidity of the frame and maintain the bend shape.

[0014] Preferably, the back-radiation shielding assembly includes back-radiation shielding modules and mounting flanges. The back-radiation shielding assembly is formed by splicing multiple back-radiation shielding modules along the longitudinal direction of the radiotherapy bed. Each back-radiation shielding module has mounting flanges on both sides, and the mounting flanges of the back-radiation shielding modules located at the edges overlap the suspension base assembly. Adjacent back-radiation shielding modules are spliced ​​together using a stepped interlocking structure. The stepped interlocking structure is configured such that the rear end face of the preceding module and the front end face of the following module form a stepped overlapping interlock to block linear radiation gaps.

[0015] Preferably, both the folded shielding assembly and the back-radiation shielding assembly adopt a composite shielding material structure, which includes, from the inside out: an electron absorption layer made of a low atomic number material for absorbing secondary electrons; a main shielding layer made of a high-density radiation shielding material; and a structural reinforcement layer made of a high-strength lightweight material for providing structural support and surface protection.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Achieved true full-dimensional protection: For the first time, "backscattering" protection was incorporated into a systematic solution. Through the top cover, the base side shielding, and the bottom module, a complete closed shielding ring was formed around the patient's critical organs (such as the thyroid, breast, lungs, and spinal cord), which significantly reduced the radiation dose to non-target organs and helped reduce the risk of long-term complications and secondary primary cancers.

[0017] 2. Creates a "zero-pressure" patient experience: The suspension design ensures that all shielding elements do not come into contact with the patient's body, completely solving the problems of heavy burden, stuffiness, and restriction of breathing movement caused by traditional lead aprons, greatly improving the patient's comfort and positional stability during long-term radiotherapy.

[0018] 3. Achieved "non-destructive and stable" bed adaptation: The unique flip-type T-shaped locking mechanism, through purely mechanical actions of "lifting-insertion / pulling out," "releasing-automatic horizontal reset," and "knob-thread clamping," achieves extremely simple operation and controllable and uniform clamping force for non-destructive installation. Its clamping force is purely vertical, causing zero damage and zero wear to the smooth carbon fiber bed board and its precision positioning holes, perfectly solving the installation problem of protective accessories for high-end radiotherapy beds.

[0019] 4. It has an active "anti-collision" safety guarantee: The chamfered anti-collision design of the top shield has been rigorously verified by the motion envelope, which eliminates the possibility of interference with the rotating gantry from the physical structure, eliminates the risk of equipment collision during treatment, and ensures the safety of expensive radiotherapy equipment and patients.

[0020] 5. Demonstrates efficient "modular" clinical operation: The system employs simple connection methods such as quick-connect, sliding, and splicing, making assembly and disassembly processes clear and rapid. The three-step operation of the base anchoring mechanism—"lift, turn, and tighten"—is intuitive and clear, allowing a single person to complete the entire installation and disassembly process within minutes, greatly adapting to the fast pace of clinical work. The modular design also facilitates transportation, storage, and partial maintenance and updates. Attached Figure Description

[0021] Figure 1 This is a three-dimensional assembly diagram of the overall system of the present invention; Figure 2 This is a schematic diagram of the suspension base assembly; Figure 3 This is a schematic diagram illustrating the operational process of the anchoring mechanism in the suspension base assembly. Figure 4 This is a structural diagram of the top folded plate shielding assembly; Figure 5 This is a structural diagram and assembly schematic of the bottom back-projection protection module; Figure 6 This is a schematic diagram of the shielding material structure.

[0022] In the diagram: 1. Suspension base assembly; 2. Radiotherapy bed; 3. Folded plate shield assembly; 4. Back-radiation shield assembly; 5. Anchoring mechanism; 6. Rigid support frame; 101. Upper pressure plate; 102. Vertical connecting plate; 103. Bearing interface section; 301. Top surface; 302. Side skirt; 303. Beveled transition section; 401. Back-firing protection module; 402. Mounting wing flange; 501. Hollow shaft; 502. Tilting crossbeam; 503. Locking drive component; 504. Unlocking component; 601. End frame; 602. Reinforcing rib; 1031. Outer slot; 1032. Inner load-bearing crossbeam.

[0023] Figure 3 middle: Figure 3 (a) Insertion state: Shows the process of lifting the lever and flipping the crossbeam vertically downwards for insertion; Figure 3 (b) Crossbeam reset: After releasing the handle, the flipped crossbeam automatically returns to a horizontal position and is in a relaxed state; Figure 3 (c) Knob locking: Demonstrate the state of tightening the knob clockwise, flipping the crossbeam upwards to clamp the bed board; Figure 3 (d) Knob loosening: Demonstrate that turning the knob counterclockwise loosens the crossbeam and moves it down to restore the clearance; Figure 3 (e) Pull out: Show the process of pulling the lever again, flipping the crossbeam and pulling it vertically upward.

[0024] Figure 5 middle: Figure 5 (a) Backlight protection module structural view; Figure 5 (b) Cross-sectional view of the module splicing principle.

[0025] Figure 6 In the middle: a) Electron absorption layer; b) Main shielding layer; c) Structural reinforcement layer. Detailed Implementation

[0026] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0027] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0028] 1. Suspension base assembly: The system's rigid anchoring framework: This component forms the foundation for the entire system's connection to the radiotherapy bed. Its core function is to provide extremely stable support points without damaging the expensive bed surface. Its technical details are as follows: (1) Stepped integrated configuration: This component is made of high-strength aluminum alloy with a continuous cross-section that is approximately “Z” shaped. It is divided into three parts from top to bottom: Upper pressure plate: Used to fit a large area of ​​the upper surface of the radiotherapy bed, it is the main pressure-bearing and force-transmitting component.

[0029] Vertical connecting plate: provides load-bearing support for both inner and outer extensions.

[0030] Bearing interface section: The connection port at the bottom of the top shielding component is supported by a "closed groove".

[0031] The upper pressure plate is elongated, with a flexible cushioning pad covering its lower surface to protect the carbon fiber bed surface. The plate has through holes coaxial with the positioning holes of the radiotherapy bed, and its inner edge extends beyond the through holes towards the center of the bed to form a stable pressing plane. Its outer edge is aligned with the outer edge of the radiotherapy bed.

[0032] (2) Enhanced anchoring system: At least two anchoring nodes are precisely installed along the length of the upper pressure plate. Each node is equipped with a flip-type T-shaped locking mechanism. The core innovation of this mechanism is: a) Structural Composition: The mechanism includes a vertically arranged externally threaded hollow shaft, a tilting beam hinged to the lower end of the hollow shaft, a locking drive component threaded to the upper end of the hollow shaft, and an unlocking component passing through the interior of the hollow shaft. The lower end of the unlocking component is eccentrically connected to the tilting beam, and the upper end is provided with a lifting ring.

[0033] b) Working principle and action status: Insertion / extraction status: Pull up the lifting ring of the unlocking component to drive the flip beam to rotate around the hinge point to a vertical state. At this time, the overall width is smaller than the diameter of the positioning hole of the radiotherapy bed, and the mechanism can be vertically inserted into or pulled out of the positioning hole.

[0034] Reset state: When the lifting ring is released, the flip beam automatically falls down to a horizontal state under the action of gravity or the built-in auxiliary spring, forming a "T" shaped structure. Its span is greater than the diameter of the positioning hole, and it can be suspended under the bed board. At this time, there is a gap between the mechanism and the bed board, which can be used for fine-tuning and positioning.

[0035] Locked State: Rotating the locking drive clockwise causes the bottom of the knob to press firmly against the upper surface of the upper pressure plate. Simultaneously, the threaded drive shaft moves upward, forcefully lifting the horizontally positioned tilting beam and hooking it onto the lower surface of the radiotherapy bed. At this point, the upper pressure plate and the radiotherapy bed are simultaneously clamped between the top knob and the bottom tilting beam, using the bed as a load-bearing interlayer to achieve rigid and non-destructive fixation of the base on the radiotherapy bed.

[0036] (3) Bidirectional load-bearing interface design: a) Outer pocket slot: Located on the outer side of the lower end of the vertical connecting plate, it is a "U"-shaped channel with closed end caps at both ends, used to accurately receive and fix the lower end of the side wall of the top shield assembly. A ball locking pin or friction pad can be installed in the slot to ensure no shaking after insertion.

[0037] b) Inner load-bearing crossbeam: Located on the inner side of the upper middle area of ​​the vertical connecting plate (near the lower surface of the radiotherapy bed), and extending horizontally towards the central axis of the bed, it is a smooth rigid crossbeam that serves as the suspension rail and load-bearing beam for the bottom back radiation shielding module.

[0038] 2. Top Folded Plate Shielding Component: Suspended protection on the top and sides: This component is responsible for shielding the main scattered rays from the direction of the aircraft head and the indoor reflected rays. Its design is significantly different from the traditional flat lead screen.

[0039] (1) Multi-segment bending anti-collision shape: Its cross-section is continuously bent, consisting of a central top horizontal plane, chamfered transition sections extending to both sides, and vertical sidewall skirts at the ends. The angle of the chamfered transition section needs to be strictly calculated in three-dimensional space to ensure that when the radiotherapy gantry rotates in the full range from 0° to 360°, the outer contour of this component should maintain a sufficient safety clearance with the accelerator head to eliminate the risk of collision.

[0040] (2) Non-contact suspension installation: The lower ends of the vertical sidewall skirts on both sides of the component are designed with plugs that precisely match the pocket slots of the base. Through a simple plug-in action, the entire cover is stably supported on the base, and its top horizontal plane needs to maintain a certain suspension space with the patient's body surface to eliminate any physical pressure on the patient's chest and abdomen.

[0041] Rigid Support Frame and Corner Reinforcement Structure: Given the significant weight of the shielding material, a "frame-skin" structure is employed to ensure the structural rigidity and long-term geometric stability of the component. Its front and rear ends feature rigid metal frames that match the bending profile. Specifically, triangular reinforcing ribs are provided on the inner side of each bend and corner of the frame. These ribs not only enhance the bending moment resistance at the frame corners, preventing the enclosure from sinking or deforming due to its own weight, but also act as connectors, reinforcing the integrity of the top plate and side skirts, ensuring the precise maintenance of the aforementioned "impact-resistant profile."

[0042] To support the weight of the high-density composite shielding material and precisely maintain the aforementioned "multi-segment bending" geometry, the top folded shielding cover assembly is also equipped with an integrated rigid support frame.

[0043] End gantry frame: The skeleton mainly includes gantry-shaped end frames (or arched frames) set at the openings at the front and rear ends of the cover. The outline of the end frame is consistent with the cross-sectional shape of the folded plate shield, serving to shape and protect the edges.

[0044] Corner reinforcing ribs: Triangular reinforcing ribs (or corner support plates, corner brackets) are provided at the inner bends of the end frame (i.e., the connection between the top horizontal plane and the chamfered transition section, and the connection between the chamfered transition section and the vertical sidewall skirt). Their functions are twofold: first, to increase the stiffness of the joints by reinforcing ribs, preventing angular deformation of the frame under load and ensuring that the shielding cover will not collapse or deform under long-term suspension; second, as connecting nodes, the reinforcing ribs effectively transfer the top load to the vertical sidewalls on both sides, and ultimately to the bottom connector, forming a stable mechanical transmission path.

[0045] (4) Handles: Two handles are symmetrically installed on both sides of the cover to facilitate two staff members to carry out stable and safe handling and installation operations.

[0046] 3. Bottom Backscatter Shielding Component: Modular interception of under-bed scattering rays: This component is specifically designed to shield backscattering rays that penetrate the radiotherapy bed, filling a critical gap in clinical protection.

[0047] (1) Modular stepped interlocking design: This component is composed of multiple independent back-radiation-proof stepped modules spliced ​​along the longitudinal direction of the radiotherapy bed. The front and rear ends of each module are processed into complementary "stepped" cross-sections. Specifically, the front end of the module is the "lower step" (the lower half protrudes), and the rear end is the "upper step" (the upper half protrudes). When the modules are pushed in along the load-bearing crossbeam on the inner side of the base and come together, the "lower step" of the previous module will naturally insert into the cavity below the "upper step" of the next module, forming a certain depth of overlapping and interlocking. This labyrinthine stepped interlocking structure can effectively eliminate the straight radiation leakage path of the splicing gap between modules.

[0048] (2) Hanging and tight fit: The modules are equipped with hanging flanges (hanging wings) made of high-strength materials on both sides, which can be easily hung on the supporting beam, while ensuring that the top surface of the module is as close as possible to the lower surface of the radiotherapy bed board, minimizing the gap that radiation can penetrate.

[0049] 4. Composite Shielding Material Structure: All shielding components (top cover and bottom module) adopt an advanced three-layer composite structure, optimizing weight and strength while ensuring shielding effectiveness. (1) Inner layer (patient side): Electron absorption layer: made of low atomic number material. Its main function is to absorb secondary electrons generated by high-energy photons and prevent electron contamination.

[0050] (2) Middle layer: Main shielding layer: High-density material is used, which is the core layer for shielding X-rays and γ-rays.

[0051] (3) Outer layer: Structural reinforcement layer: Made of high-strength, lightweight materials. This layer provides overall structural rigidity, impact resistance and wear-resistant surface protection.

[0052] System overall structure (see) Figure 1 ) like Figure 1 As shown, the present invention provides a suspended combined all-around anti-scattering shielding system for head and neck radiotherapy, which mainly consists of three parts: a pair of suspension base assemblies installed on both sides of the radiotherapy bed, a top folding plate shielding assembly spanning across the bed, and a bottom anti-back-radiation shielding assembly suspended below the bed. These three components cooperate with each other through mechanical interfaces to form a closed radiation protection ring surrounding the patient's torso area below the neck (i.e., the non-target area).

[0053] 2. Suspension base assembly and its anchoring mechanism (see...) Figure 2 , Figure 3 ) The suspension base assembly 100 is the foundation of the system. For example... Figure 2 As shown, its main body is made of high-strength aluminum alloy in one piece, and has a stepped structure.

[0054] Main structure: Includes an upper pressure plate flat against the surface of the radiotherapy bed, a vertical connecting plate extending downwards, and a load-bearing interface at the bottom. A 3mm thick medical-grade silicone cushioning pad is attached to the bottom surface of the upper pressure plate, which increases friction and prevents metal from directly scratching the carbon fiber bed surface.

[0055] Anchoring node configuration: In this embodiment, to achieve optimal stress uniformity, three anchoring nodes are provided along the length of the upper pressure plate (located at the front, middle, and rear positions, respectively). It should be noted that, depending on the load-bearing requirements of the radiotherapy bed, the number of anchoring nodes can be adjusted to at least two (e.g., only two endpoints are set, or three nodes are set), both of which are within the scope of protection of this invention.

[0056] Anchoring mechanism: The anchoring mechanism is a flip-type T-shaped locking mechanism (core innovation, see [link]). Figure 3 Each anchoring node is equipped with an anchoring mechanism. The mechanism includes a hollow shaft that passes vertically through the upper pressure plate, a locking drive at the top of the hollow shaft, an unlocking component inside the hollow shaft, and a flip beam hinged to the bottom of the hollow shaft.

[0057] Action flow: Insertion phase ( Figure 3 a): The operator lifts the lifting ring of the unlocking device, and the pull rod drives the bottom flip beam 106 to rotate around the hinge axis to a vertical position. At this time, the overall projected diameter of the beam and the hollow shaft is smaller than the diameter of the positioning hole of the radiotherapy bed (e.g., less than 14mm), and it can be inserted vertically downward into the positioning hole.

[0058] Reset phase ( Figure 3b): After insertion, release the lifting ring. The flip beam 106 will automatically fall down under the action of gravity (or auxiliary torsion spring) and become horizontal. At this time, its length (e.g., 40mm) is much larger than the diameter of the positioning hole, forming a "T"-shaped hook structure, which is suspended under the bed board.

[0059] Locking phase ( Figure 3 c): Rotate clockwise to lock the drive mechanism. The knob presses against the surface of the upper pressure plate, lifting the hollow shaft 103 via threaded transmission, which in turn drives the horizontally rotating beam 106 upward until it tightly hooks onto the lower surface of the bed board. At this point, the radiotherapy bed board is rigidly clamped between the upper pressure plate and the rotating beam, completing the fixation.

[0060] Disassembly stage ( Figure 3 de): Loosen the knob counterclockwise, then lift the lever again to make the crossbeam vertical, and the base can be pulled out.

[0061] 3. Top folding plate shielding assembly (see...) Figure 4 ) The top folding shield assembly provides protection from above and to the sides.

[0062] Collision-resistant shape: such as Figure 4 As shown, the cross-section of the shroud is not a simple semi-circle or square, but rather employs a multi-segment bending design. This includes a central horizontal top surface, vertical side skirts on both sides, and a chamfered transition section connecting the two. In this embodiment, the chamfered transition section has an inclination angle of 20°. This angle, combined with a specific height design, has been verified through simulation to maintain a safe clearance of at least 150mm with the radiotherapy gantry even when rotated to the most unfavorable angle, effectively preventing collisions.

[0063] Rigid frame and reinforcing ribs (structural enhancement): Considering the large weight of the shielding material (the total weight may exceed 15kg), in order to prevent the enclosure from deforming due to long-term suspension, the front and rear openings of the enclosure are equipped with door-shaped end frames made of aluminum alloy.

[0064] Key feature: Triangular reinforcing ribs are welded or bolted to the inside of each bend and corner of the frame.

[0065] The reinforcing rib has a dual function: first, it greatly improves the bending stiffness at the corner, ensuring that the enclosure will not collapse inward due to gravity; second, as a force transmission node, it effectively guides the weight of the top to the side walls and finally to the base.

[0066] Suspension installation: The bottom of the side skirt is inserted into the U-shaped slot on the outside of the base, so that the entire cover is suspended above the patient's body, with a space of about 150mm between the top surface and the patient's body surface, achieving "zero pressure" protection.

[0067] Bottom backlight shielding assembly (see) Figure 5 ) The bottom back-radiation shielding assembly is composed of several (4-6 in this embodiment) standardized back-radiation shielding modules spliced ​​together along the longitudinal direction of the bed.

[0068] Stepped interlocking structure: such as Figure 5 As shown in (b), to solve the problem of radiation leakage at the module splicing point, the rear end face of module A is designed as an upper step with a protruding upper half, and the front end face of module B is designed as a lower step with a protruding lower half. When the two are brought together, they form an overlapping interlocking structure. Linear radiation cannot penetrate this "maze-like" gap, thus ensuring the continuity of shielding.

[0069] Hanging method: Each module has high-strength L-shaped hanging flanges on both sides, which can be smoothly hung on the load-bearing crossbeam inside the suspension base assembly, and the position can be adjusted by sliding back and forth along the track.

[0070] 5. Composite shielding materials (see...) Figure 6 ) All shielding components in this system are made of... Figure 6 The three-layer composite structure shown: Inner layer (near the patient): a 1.5mm thick pure aluminum plate, used to absorb electron beams and low-energy scattered beams.

[0071] Middle layer (core shielding layer): 8mm thick lead-antimony alloy plate (or tungsten rubber composite plate with equivalent lead content), used to block high-energy X-rays.

[0072] Outer layer (structural layer): 3mm thick carbon fiber or glass fiber reinforced composite (GFRP) provides overall strength and prevents lead layer oxidation or wear.

[0073] In summary, this embodiment solves the problem of fixing the smooth carbon fiber bed through a unique anchoring mechanism, resolves the contradiction between impact protection and load-bearing capacity through a reinforced folded plate structure, and fills the gap in backscatter protection through a bottom stepped module, thus fully achieving the invention's objective.

[0074] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A suspended, modular, all-around anti-scattering shielding system specifically designed for head and neck radiotherapy, comprising a suspension base assembly (1), a radiotherapy bed (2), a folding plate shield assembly (3), an anti-back-radiation shield assembly (4), an anchoring mechanism (5), and a rigid support frame (6), characterized in that, The suspension base assemblies (1) are arranged in pairs; the suspension base assemblies (1) are installed on both sides of the radiotherapy bed (2); the top of the radiotherapy bed (2) is provided with a folded plate shield assembly, and the folded plate shield assembly (3) is arranged across the top of the paired suspension base assemblies (1); a back-radiation shield assembly (4) is suspended below the suspension base assembly (1); the suspension base assembly (1), the folded plate shield assembly (3) and the back-radiation shield assembly (4) are connected to each other; the suspension base assembly (1) is provided with an anchoring mechanism (5) for fixing to the radiotherapy bed (2).

2. The suspended combined all-around anti-scattering shielding system for head and neck radiotherapy according to claim 1, characterized in that, The main body of the suspension base assembly (1) has a stepped structure and includes, from top to bottom: an upper pressure plate (101), a vertical connecting plate (102), and a bearing interface (103). The upper pressure plate (101) is configured to fit against the upper surface of the radiotherapy bed (2). The vertical connecting plate (102) is connected to the upper pressure plate (101) and extends downward. The bearing interface (103) is located at the lower end of the vertical connecting plate (102). The bottom surface of the upper pressure plate (101) is provided with a flexible buffer layer, and the upper pressure plate (101) is provided with at least two anchoring nodes along its length direction. The anchoring mechanism (5) is installed at each anchoring node.

3. The suspended combined all-around anti-scattering shielding system for head and neck radiotherapy according to claim 2, characterized in that, The anchoring mechanism (5) is a flip-type T-shaped locking mechanism, which includes: a hollow shaft (501), a flip beam (502), a locking drive (503), and an unlocking component (504). The hollow shaft (501) is vertically inserted through the upper pressure plate (101); the flip beam (502) is hinged to the lower end of the hollow shaft (501), and the flip beam (502) has a vertically retracted state and a horizontally extended state; the locking drive (503) is threadedly connected to the upper end of the hollow shaft (501), and the locking drive... The component (503) is configured to drive the hollow shaft (501) to move upward so as to drive the flip beam (502) to clamp the radiotherapy bed (2); the unlocking component (504) is inserted inside the hollow shaft (501) and connected to the flip beam (502), and the unlocking component (504) is configured to control the flip beam (502) to switch between a vertically retracted state and a horizontally extended state; when in the locked state, the radiotherapy bed (2) is clamped between the upper pressure plate (101) and the flip beam (502) in the horizontally extended state.

4. The suspended combined all-around anti-scattering shielding system for head and neck radiotherapy according to claim 2, characterized in that, The bearing interface (103) includes: an outer slot (1031) and an inner bearing beam (1032). The outer slot (1031) is located on the outside of the vertical connecting plate (102) and is used to receive the bottom end of the side wall of the fixed folding shield assembly (3). The inner bearing beam (1032) is located on the inside of the vertical connecting plate (102) and extends horizontally towards the center of the radiotherapy bed to form a slide rail for suspending the bottom back radiation shield assembly (4).

5. The suspended combined all-around anti-scattering shielding system for head and neck radiotherapy according to claim 1, characterized in that, The folded shield assembly (3) has a multi-section bent cross-sectional shape, including: a top part (301), a side skirt (302), and a chamfered transition section (303). The top part (301) is horizontally arranged; the side skirt (302) is vertically arranged and connected to the suspension base assembly (1); the chamfered transition section (303) connects the top part (301) and the side skirt (302).

6. The suspended combined all-around anti-scattering shielding system for head and neck radiotherapy according to claim 1, characterized in that, The rigid support frame (6) includes: an end frame (601) and a reinforcing rib (602). The end frame (601) is located at the front and rear openings of the folded shield assembly (3), and its shape is adapted to the cross-sectional shape of the folded shield assembly (3). The reinforcing rib (602) is located on the inside of the bend corner of the chamfered transition section (303).

7. The suspended combined all-around anti-scattering shielding system for head and neck radiotherapy according to claim 1, characterized in that, The back-radiation shielding assembly (4) includes a back-radiation shielding module (401) and a mounting flange (402). The back-radiation shielding assembly (4) is formed by splicing multiple back-radiation shielding modules (401) longitudinally along the radiotherapy bed (2). The back-radiation shielding module (401) has mounting flanges (402) on both sides. The mounting flanges (402) of the back-radiation shielding module (401) located at the edge are attached to the suspension base assembly (1). The two adjacent back-radiation shielding modules (401) are spliced ​​together by a stepped interlocking structure.

8. The suspended combined all-around anti-scattering shielding system for head and neck radiotherapy according to claim 1, characterized in that, Both the folded shielding assembly (3) and the back-shielding shielding assembly (4) adopt a composite shielding material structure, which includes, from the inside out: an electron absorption layer, a main shielding layer, and a structural reinforcement layer.

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