A CT scan bed support system and method for afterloading therapy

Abstract

The application provides a CT scanning bed support system and method for afterloading therapy, comprising: an extension plate hinged to one end of a CT main bed plate, the extension plate being a foldable structure; an afterloading lifting platform arranged above an afterloading base, an afterloading workbench connected to the top of the afterloading lifting platform through horizontal guide rails on both sides, the afterloading lifting platform being used for adjusting the support height of the afterloading workbench; a rack main body arranged on one side of the CT main bed plate, the rack main body being provided with a positioning groove at the bottom of the afterloading installation side, the bottom of the afterloading base being provided with a rack quick locking mechanism, the rack quick locking mechanism being matched with the positioning groove; a bed plate quick locking mechanism locked with the CT main bed plate through a universal interface, and a foldable multi-position foot support arranged on the afterloading trolley; the extension plate is adopted to realize quick switching between a conventional scanning mode and an afterloading therapy mode, afterloading therapy and scanning positioning are completed on the same machine, and according to double grading interlocking, emergency unlocking and abnormal early warning are increased.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to a CT scanning bed support system and method for afterloading therapy. Background Technology

[0002] Brachytherapy is a brachytherapy technique that involves placing an applicator into the patient's body cavity or tissue, confirming its location, and then applying a radiation source. This technique requires the patient to remain in the same position after CT scan localization, receiving the procedure from behind the CT scanner bed. The core requirements are ensuring consistency between CT localization and brachytherapy positioning, minimizing bed deformation errors, and improving operational safety and efficiency.

[0003] Several technical solutions for existing afterloading therapy and CT scan compatibility devices have been disclosed. For example, the three-dimensional afterloading radiotherapy fixation bed disclosed in CN209714033U is only designed as a treatment bed and does not have CT scan function. Moreover, when the patient moves from the CT scan to the treatment bed, the area to be treated may change, affecting the treatment.

[0004] The image-guided brachytherapy combination device disclosed in CN114632271A only transfers the patient from the CT diagnostic room to the brachytherapy room, and does not achieve integrated diagnosis and treatment. Although the above-mentioned existing technology has solved the basic problems of bed movement, patient positioning and CT adaptation in brachytherapy, there are still many unresolved technical pain points. At the same time, the general design of the existing technology cannot meet the clinical requirements of high precision, high safety and high adaptability. The specific problems are as follows: Traditional solutions: The bed board extends ≥1500mm towards the CT host, or a static support structure is used to adapt to the cantilever, such as CN114632271A which is connected to the CT bed by a transfer bed, but cannot achieve integrated diagnosis and treatment; CN209714033U uses an integrated lifting support for the bed body, but has no diagnostic function. Limitations: Under current conditions, placing diagnosis and treatment in the same location requires solving the problem of bed board deformation control in cantilevered conditions (requiring ≤2mm), which necessitates high-rigidity materials and complex compensation systems, resulting in high costs. Furthermore, all existing technologies rely on static support without real-time stress detection and deformation compensation, leading to inconsistent micro-deformation of the bed board under different patient weights and body positions, further affecting the accuracy of radiotherapy positioning.

[0005] Traditional solutions rely on operator experience or use only a single mechanical locking / motion-prevention design. Accidental movement of the bed during treatment can easily lead to displacement of the applicator. Furthermore, there is no emergency unlocking mechanism, resulting in rigid operation in emergency scenarios. There is no interlocking abnormality warning, and treatment can easily be interrupted due to malfunctions. Summary of the Invention

[0006] To address at least one of the aforementioned technical problems, the present invention proposes a CT scan bed support system for afterloading therapy, comprising: The CT main bed board has a universal interface at its head. An extension plate is hinged to one end of the CT main bed plate, with the hinge rotation center located on the side of the CT scanning bed. The extension plate has a foldable structure. The afterloading treatment cart includes an afterloading base, an afterloading lifting platform and an afterloading worktable. The afterloading lifting platform is located above the afterloading base and below the afterloading worktable. The afterloading worktable is connected to the top of the afterloading lifting platform via horizontal guide rails on both sides. The afterloading lifting platform is used to adjust the support height of the afterloading worktable. The main body of the gantry is located on one side of the CT main bed plate and is a conventional CT scanning large-aperture gantry. The gantry has a positioning groove at the bottom of the rear mounting side and a quick-locking mechanism for the gantry is provided at the bottom of the rear mounting base. The quick-locking mechanism for the gantry cooperates with the positioning groove. The rear loading workbench is equipped with a bed board quick-locking mechanism at one end. The bed board quick-locking mechanism is locked to the CT main bed board through a universal interface. The bed board quick-locking mechanism is adjusted and connected before the first use. In subsequent uses, it is directly and quickly connected to the bed board. The rear loading trolley is equipped with a foldable multi-position leg.

[0007] In a preferred embodiment of the present invention, the quick locking mechanism of the frame includes a fixed plate fixedly installed at one end of the bottom of the afterloading treatment cart. A positioning pin is provided at the center of one end of the fixed plate, and electromagnetic positioning pins are provided on both sides of the positioning pin. Adjustable positioning blocks are symmetrically provided at the bottom of the fixed plate on both sides of the electromagnetic positioning pins.

[0008] In a preferred embodiment of the present invention, guide rails are symmetrically arranged on both sides of the top of the rear mounting worktable, and sliders are connected to the guide rails. The rear mounting worktable is fixedly installed on the sliders. The bed board quick-locking mechanism is fixedly installed at the front end of the rear mounting worktable, and the multi-position leg is installed at the rear end of the rear mounting worktable. A source fixing device is arranged between the two legs. The bed board quick-locking mechanism includes a positioning protrusion and an electromagnetic positioning pin. The positioning protrusion is aligned and positioned with the notch of the CT bed board. The electromagnetic positioning pin is fixed to the bed board after being energized, so that the rear mounting worktable and the CT main bed board are rigidly and synchronously connected.

[0009] In a preferred embodiment of the present invention, the rear-mounted lifting platform includes vertical guide rail slider structures on both sides. The guide rails are fixedly installed at the bottom of the rear-mounted worktable. Electric push rods are symmetrically arranged on both sides of the rear-mounted lifting platform. The electric push rods push the rear-mounted worktable up and down in the vertical direction, and the rear-mounted worktable can move synchronously with the CT scanning bed in the horizontal direction.

[0010] In a preferred embodiment of the present invention, a tactile and sound feedback module is further included. The tactile and sound feedback module is electrically connected to the quick-locking mechanism. When the mechanism is locked in place, tactile and sound prompts are generated and displayed visually via LEDs.

[0011] In a preferred embodiment of the present invention, a graded interlocking safety system is also included. The graded interlocking safety system includes a hardware and software dual interlocking module, a graded protection module, an emergency unlocking module, and an interlocking abnormality early warning module. The hardware interlocking cuts off the bed motion drive signal and automatically maintains the locked state when the power is off.

[0012] In a preferred embodiment of the present invention, the interlocking abnormality early warning module monitors the locking status, interlocking signal and displacement monitoring signal in real time, and provides audible and visual early warnings for locking looseness, signal abnormality, module failure and offset exceeding limits.

[0013] In a preferred embodiment of the present invention, the graded protection module is configured with three protection levels, the three protection levels including: Light protection, whereby the light protection is a light reminder; Moderate protection, which means prohibiting unnecessary movement; Heavy protection, which means completely locking the CT main bed board.

[0014] This invention proposes a CT scan bed support method for afterloading therapy, applicable to a CT scan bed support system for afterloading therapy, comprising the following steps: Standard CT scan mode: The extension plate is unfolded and spliced ​​with the main CT bed to form a complete bed surface; Move the afterloading therapy cart to a non-working area, move the main bed horizontally and vertically, and perform a routine CT scan for localization. Afterloading mode: Rotate the extension plate 90° and fit it to the side of the CT main bed plate. Connect the afterloading cart to the CT main bed plate. Connect the afterloading worktable to the head of the CT bed plate through the bed plate quick locking mechanism. Connect the afterloading base to the main body of the gantry through the gantry quick locking mechanism. Treatment completion mode: After the doctor completes the loading and treatment operation, the locking state of the quick-locking mechanism of the gantry and the quick-locking mechanism of the bed board is released, the loading and treatment trolley is moved, the extension plate is unfolded, and it is spliced ​​with the CT main bed board to form a complete bed surface.

[0015] In a preferred embodiment of the present invention, the applicator is placed in a designated position, the patient is positioned and fixed on a multi-position tripod, and a thin-slice positioning scan is performed with the afterloading bed board and the CT bed board connected. The scanned image is obtained by moving a distance along the Z-axis to meet the preset scan length. The scanned image is then transmitted to the treatment planning system, where the doctor identifies the target area and calculates the dose.

[0016] The technical solution of the present invention has the following advantages over the prior art: By shortening the cantilever of the bed board and improving the deformation control accuracy to ≤0.5mm through dynamic compensation, the difficulty of deformation control is reduced. The extension plate allows for rapid switching between regular scanning and afterloading therapy modes in less than 2 minutes, requiring no additional storage space. The design incorporates both mechanical and software-based hierarchical interlocking mechanisms, enhancing emergency unlocking and anomaly warning systems to fundamentally prevent misoperation. This locking mechanism can achieve a five-degree-of-freedom locking function, and combined with dual anti-loosening and tactile feedback, it improves the position repeatability accuracy to ≤0.5mm; It adopts an externally mounted, independently mounted afterloading treatment cart design, which is compatible with existing CT beds of different brands, reducing hospital renovation costs and improving versatility; It integrates multi-position tripods and operation assistance functions to meet the needs of multiple departments and improve the convenience of clinical operation; The overall cost of equipment research and development and use is reduced, while taking into account high precision, high safety and high adaptability. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, some of the drawings in the following description are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the CT scanning bed support system for afterloading therapy according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the bottom structure of the CT scanning bed support system for afterloading therapy according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the extended plate in the unfolded state according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the extension plate in a folded state according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the afterloading treatment cart structure according to an embodiment of the present invention; Figure 6This is a schematic diagram of the afterloading treatment cart from another angle according to an embodiment of the present invention; Figure 7 This is a schematic diagram illustrating the connection between the afterloading therapy cart and the CT scanning bed in an embodiment of the present invention; Figure 8 This is a schematic diagram of the CT scanning bed treatment status during afterloading therapy according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the extension plate structure according to an embodiment of the present invention; Figure 10 This is a flowchart of the afterloading treatment preparation and support connection process according to an embodiment of the present invention.

[0019] In the diagram, 1. Scanning bed, 2. CT main bed board, 3. Frame body, 4. Positioning leg, 5. Afterloading treatment cart, 6. Afterloading worktable, 7. Horizontal guide rail, 8. Electric push rod, 9. Afterloading base, 10. Casters, 11. Afterloading lifting platform, 12. Frame quick locking mechanism, 13. Positioning pin, 14. Positioning block, 15. Applicator fixing device, 16. Positioning groove, 17. Extension plate, 18. Electromagnet, 19. Bed board quick locking mechanism, 20. Positioning pin, 21. Damping hinge, 22. Equal attenuation polyurethane soft strip. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0022] Example 1 See Figures 1-9 As shown, this invention proposes a CT scan bed support system for afterloading therapy, comprising: CT main bed board 2, the head of which is provided with a universal interface; The extension plate 17 is hinged to one end of the CT main bed plate 2, and the extension plate 17 has a foldable structure; Specifically, the main bed board and the extension board are designed with a double-layer 45° beveled stepped tenon joint, which fits perfectly when unfolded, with no straight air gaps in the horizontal direction, thus avoiding artifacts. The extension plate locking positioning pin 20 has a taper, which can ensure that the splicing gap is ≤0.1mm after full locking. If it is not fully locked, the safety interlock system will not detect the connection sensor signal and prohibit the CT scan from starting, thus eliminating the scanning of this failure condition from the process. The extension board and the main bed board are joined by a tenon with an embedded equal-attenuation polyurethane soft strip 22 (with the same CT value as the carbon fiber bed board) to ensure that there are no artifacts in the connection part. The extension plate locking connection structure is a manual pure mechanical mechanism, and the material used is an artifact-free material. The damping hinge 21 has a built-in two-stage damping material: 0-70° light damping for easy push and pull; 70-90° high damping buffer limit to prevent the extension plate from hitting the bed side wall. The positioning pin 20 features a rounded guide head with micro-self-correction, automatically aligning and locking within 2mm of misalignment during splicing, reducing the difficulty of alignment for medical staff. Simultaneously, the positioning pin 20 employs a tapered locking mechanism, ensuring a stable locking gap of ≤0.1mm, minimizing artifacts caused by improper human operation, and preventing impact deformation during flipping.

[0023] When used in normal locking and unfolding mode: no clinically impactful artifacts will appear; relying on the concave-convex tenon joint, double locking, and equal attenuation filling triple structure, air gaps are compressed to a negligible imaging level; When the gap is not fully locked or the assembly fails, it will produce obvious strip-shaped low-density artifacts. However, the graded interlocking safety system will block the scan to prevent unqualified images from being used for radiotherapy positioning. The afterloading treatment cart 5 includes an afterloading base 9, an afterloading lifting platform 11, and an afterloading worktable 6. The afterloading lifting platform 11 is located above the afterloading base 9 and below the afterloading worktable 6. The afterloading worktable 6 is connected to the top of the afterloading lifting platform 11 via horizontal guide rails 7 on both sides. The afterloading lifting platform 11 is used to adjust the support height of the afterloading worktable 6. The main body of the gantry is located on one side of the CT main bed plate 2. It is a conventional CT scanning large-aperture gantry. The bottom of the gantry is provided with a positioning groove 16, which is circular. The bottom of the rear mounting base 9 is provided with a gantry quick locking mechanism 12. The positioning pin 13 of the gantry quick locking mechanism 12 cooperates with the positioning groove 16, and can be quickly positioned by simple plugging and unplugging. The rear loading workbench 6 is equipped with a bed board quick locking mechanism 19 at one end. The bed board quick locking mechanism 19 is locked to the CT main bed board 2 through a universal interface. The bed board quick locking mechanism 19 is adjusted and connected before the first use. In subsequent uses, it is directly and quickly connected to the bed board. The rear loading trolley is equipped with a foldable multi-position leg 4.

[0024] According to an embodiment of the present invention, the quick-locking mechanism 12 of the frame includes a fixing plate fixedly installed at one end of the bottom of the post-loading treatment cart 5. A positioning pin 13 is provided at the center of one end of the fixing plate, and electromagnetic positioning pins 13 are provided on both sides of the positioning pin 13. Adjustable positioning blocks 14 are symmetrically arranged at the bottom of the fixing plate on both sides of the electromagnetic positioning pins 13. When the adjustable positioning blocks 14 are installed on the quick-locking mechanism 12 of the frame, they can be adjusted in the front and back directions to ensure that the post-loading worktable and the scanning bed are completely fitted together. The electromagnetic positioning pins 13 are also aligned with the pin holes at the bottom of the frame. After the initial adjustment, the mounting screws of the electromagnetic positioning pins 13 and the adjustable positioning blocks 14 are tightened. In subsequent use, as long as the adjustable positioning blocks 14 are close to the bottom of the frame, the worktable and the scanning bed can be completely fitted together, and the positioning pins can be inserted downwards to lock. It should be noted that the quick-locking mechanism can perform five-degree-of-freedom multi-dimensional positioning, including horizontal, vertical, and rotational positioning pins 13, to achieve full-dimensional precise positioning with a position repeatability accuracy ≤0.5mm. Double anti-loosening locking structure: mechanical quick locking, combined with mechanical buckle + electromagnetic locking. The electromagnetic locking is only activated when the buckle is fully engaged, which fundamentally prevents the locking from loosening. Locking status feedback: When locked in place, the handle provides a clear tactile feedback and an audible prompt, along with a visual display on an LED indicator, to avoid human error. Connection status sensor: Real-time detection of whether the support platform and CT main bed 2 are fully connected, and transmits the signal to the safety interlock system.

[0025] According to an embodiment of the present invention, guide rails are symmetrically arranged on both sides of the top of the rear mounting worktable 6, and sliders are connected to the guide rails. The rear mounting worktable 6 is fixedly installed on the sliders. The bed board quick locking mechanism 19 is fixedly installed at the front end of the rear mounting worktable 6. The multi-position leg 4 is installed at the rear end of the rear mounting worktable 6. An applicator fixing device 15 is arranged between the two legs. The bed board quick locking mechanism 19 includes a positioning protrusion and an electromagnetic positioning pin 13. The positioning protrusion is aligned and positioned with the notch of the CT bed board. The electromagnetic positioning pin 13 is fixed to the bed board after being energized, so that the rear mounting worktable 6 and the CT main bed board 2 are rigidly and synchronously connected.

[0026] According to an embodiment of the present invention, the length of the extension plate 17 is 500-700mm, and the material of the extension plate 17 is carbon fiber.

[0027] It should be noted that the universal interface is compatible with different brands of CT beds, enabling quick hinge connection with the extension plate 17.

[0028] The extension plate 17 is adapted to support the patient's leg, and the overall deformation after folding is ≤0.5mm; The extension plate 17 is connected to the scanning bed 1 by hinge at the head of the CT main bed plate 2. It adopts a self-locking damping hinge + positioning pin 13 structure, which meets the rigidity requirements of CT scanning in both folded and unfolded states. The extension board 17 folds to fit the two sides of the CT main bed board 2, without the need for complete disassembly and without the need for additional storage space. Usage status: Unfolded state: It is spliced ​​with the CT main bed board 2 to form a complete support surface for CT scan positioning. The overall deformation is ≤0.5mm through mechanical structure and electromagnetic locking. Folded state: Fits the side of the CT main bed board 2, leaving ≥500mm of operating space behind the CT main bed board 2 for brachytherapy.

[0029] According to an embodiment of the present invention, the rear mounting lifting platform 11 includes vertical guide rail slider structures on both sides. The guide rails are fixedly installed at the bottom of the rear mounting worktable 6. Electric push rods 8 are symmetrically arranged on both sides of the rear mounting lifting platform 11. The electric push rods 8 push the rear mounting worktable 6 to rise and fall in the vertical direction, and the rear mounting worktable 6 can move synchronously with the CT scanning bed 1 in the horizontal direction.

[0030] According to an embodiment of the present invention, a tactile and sound feedback module is further included. The tactile and sound feedback module is electrically connected to the quick locking mechanism. When the locking is in place, tactile and sound prompt information is generated and displayed visually via LED.

[0031] According to an embodiment of the present invention, a graded interlocking safety system is also included. The graded interlocking safety system includes a hardware and software dual interlocking module, a graded protection module, an emergency unlocking module, and an interlocking abnormality early warning module. The hardware interlocking cuts off the bed motion drive signal and automatically maintains the locked state when the power is off.

[0032] According to an embodiment of the present invention, the interlocking abnormality early warning module monitors the locking status, interlocking signal and displacement monitoring signal in real time, and provides audible and visual early warnings for locking looseness, signal abnormality, module failure and offset exceeding limits.

[0033] According to an embodiment of the present invention, the graded protection module is configured with three protection levels, the three protection levels including: Light protection, indicated by a light warning; Moderate protection, which involves manual intervention and prohibits unnecessary exercise; Severe protection, severe protection means terminating treatment and completely locking the CT main bed panel 2.

[0034] According to an embodiment of the present invention, the afterloading treatment cart 5 has the following structure: Basic structure: Independent mobile support platform, not integrated with the main CT bed, with 10 anti-slip locking casters at the bottom to adapt to different floor surfaces in the treatment room; Height adjustment: Electric height adjustment is compatible with different brands of CT beds, with a height adjustment accuracy of ≤0.1mm; Dynamic deformation compensation module: The support surface integrates a pressure sensing module and an adaptive lifting module to detect the force value of the head of the CT main bed plate 2 in real time. By electrically adjusting the support height of the support platform, it automatically compensates for the micro deformation of the bed plate under different forces, and controls the deformation of the head of the CT main bed plate 2 to ≤0.5mm. Multifunctional integration: Standardized multi-position scaffolding interface: Place the scaffolding in the appropriate position as needed. To ensure versatility of use, the two leg fixing devices can be adjusted at multiple angles to accommodate multi-position scaffolding for lithotomy, lateral decubitus, and prone positions. The quick-release module allows for rapid replacement to meet the needs of multiple departments such as gynecology, urology, and proctology. Operational assistance functions: Added foldable radiation protection baffle, height-adjustable operating tray, and patient positioning fixation strap interface; Lightweight design: The main body is made of magnesium alloy, which reduces the weight by 30% compared to existing mobile devices, and can be pushed by a single person.

[0035] Example 2 like Figure 10 As shown, this invention proposes a method for supporting a CT scan bed 1 for afterloading therapy, applicable to a CT scan bed 1 support system for afterloading therapy, comprising: The system offers both standard CT scan mode and afterloading therapy mode, and the two modes can be switched directly while the patient is lying on the scanning bed 1. After the treatment is completed, the scanning bed 1 can be restored to the standard CT scan state by completing the mode, and the patient can get off the scanning bed 1 normally.

[0036] Conventional CT scan mode: Deploy the extension plate 17 and splice it with the CT main bed plate 2 to form a complete bed surface; The afterloading treatment cart 5 is moved to a non-working area, and the scanning bed 1 can move horizontally and vertically to perform routine CT scan positioning. It should be noted that in the conventional CT scan mode, the foldable extension plate 17 is first installed on the head of the CT main bed plate 2 and locked through the quick release interface to form a complete bed surface with an effective scanning length ≥1700mm for conventional CT scanning. At the same time, the afterloading treatment cart 5 is moved to the non-working area and is not connected to the CT main bed plate 2. Then the bed can perform horizontal and vertical movements normally to complete the patient's CT scan positioning.

[0037] When the loading therapy cart 5 is at the same height as the CT main bed 1, the electromagnet 18 is energized and locked in place. At this time, the sensor is energized to detect that the loading therapy cart 5 and the CT main bed 2 are not misaligned, ensuring the safety of the treatment process. If displacement occurs, the power is immediately cut off and the locked state is automatically maintained.

[0038] Afterloading mode: The extension plate 17 is rotated 90° and fitted to the side of the CT main bed plate 2. The afterloading worktable 6 is connected to the head of the CT bed plate through the bed plate quick locking mechanism 19. The afterloading base 9 is connected to the main body of the gantry through the gantry quick locking mechanism 12. It should be noted that brachytherapy specifically includes: The extension plate 17 fits the side of the CT main bed board 2 without disassembly or storage, leaving ≥500mm of operating space behind the CT main bed board 2, and the mode switching time is <2 minutes. The afterloading treatment cart 5 is pushed to the head of the CT main bed plate 2 and locked to the CT main bed plate 2 through a multi-dimensional rapid locking mechanism, triggering the connection status sensor, with a position repeatability accuracy ≤0.5mm; The universal wheels 10 at the bottom of the locking support platform are automatically activated, and the pressure sensing module and adaptive lifting module are automatically activated to detect the force on the CT main bed board 2 in real time and adjust the support height, dynamically compensating for deformation to ≤0.5mm. According to the department's needs, the corresponding positioning leg 4 is installed on the support platform through quick-release modules to adjust the patient's position; The safety interlock system automatically activates the corresponding level of protection according to the treatment stage (the treatment stage is high protection, completely locking the bed), and the LED indicator shows the current protection level; The doctor performs brachytherapy procedures behind the CT main bed panel 2. In case of an emergency, authorized personnel can temporarily unlock the bed using password / fingerprint verification, and the bed will be adjusted at a low speed. The operation record will be automatically saved. During treatment, the interlocking abnormality early warning module monitors in real time. If problems such as loosening of the locking occur, it will immediately issue an audible and visual warning.

[0039] Specifically, when switching to the afterloading therapy mode, first rotate the extension plate 17 at the head of the CT main bed 2 to the unfolded position, leaving ≥500mm of operating space for the doctor behind the CT main bed 2. Then, push the afterloading therapy cart 5 to the head of the CT main bed 2 and achieve mechanical fast locking through the quick locking mechanism (position repeatability ≤1mm). Install the lithotomy stand on the standardized interface of the afterloading therapy cart 5 and adjust it to a height suitable for the patient's position. At this time, the safety interlock system is automatically activated, preventing accidental movement of the bed through a dual protection method of hardware cutting off the bed's motion signal and software prohibiting motion commands. The LED indicator simultaneously displays the "connected / locked" status, and the doctor can then complete the afterloading therapy operation within the sufficient operating space.

[0040] Treatment completion mode: After the doctor completes the loading treatment operation, the locking state of the quick-locking mechanism is released, the loading treatment trolley 5 is moved, the extension plate 17 is unfolded, and it is spliced ​​with the CT main bed plate 2 to form a complete bed surface. The applicator is placed in the designated position, the patient position is set and fixed on the multi-position tripod 4. Using the CT scan mode, the loading bed plate and the CT bed plate are connected, and a thin-slice positioning scan is performed. The distance moved along the Z-axis meets the preset scan length to obtain the scan image. The scan image is transmitted to the treatment planning system, and the doctor selects the target area and calculates the dose.

[0041] It should be noted that after the treatment is completed, first remove the lithotomy stand from the afterloading treatment cart 5 and store it, then release the locking connection between the support table and the CT main bed 2 and remove the afterloading treatment cart 5. Then, reinstall the extension plate 17 to the head of the CT main bed 2 to restore the complete bed surface. The safety interlock system is then released, the bed regains its movement permission, and the LED indicator shows the "disconnect / normal" status. Finally, the bed moves to move the patient out of the scanning area, and the entire system returns to the regular CT scanning mode.

[0042] In summary, the technical solution of the present invention has the following advantages compared with the prior art: By shortening the cantilever of the bed board and improving the deformation control accuracy to ≤0.5mm through dynamic compensation, the difficulty of deformation control is reduced. The extension plate 17 enables rapid switching between regular scanning and afterloading therapy modes in less than 2 minutes, requiring no additional storage space. The design incorporates both mechanical and software-based hierarchical interlocking mechanisms, enhancing emergency unlocking and anomaly warning systems to fundamentally prevent misoperation. This locking mechanism can achieve a five-degree-of-freedom locking function, and combined with dual anti-loosening and tactile feedback, it improves the position repeatability accuracy to ≤0.5mm; The design adopts an externally mounted, independently mounted afterloading treatment cart, which is compatible with existing CT beds from different brands, reducing hospital renovation costs and improving versatility. It integrates a multi-position tripod and operation assistance functions to meet the needs of multiple departments and improve the convenience of clinical operation. The overall cost of equipment research and development and use is reduced, while taking into account high precision, high safety and high adaptability.

[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to the above embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0045] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A CT scan bed support system for afterloading therapy, characterized in that, include: The CT main bed board has a universal interface at its head. An extension plate is hinged to one end of the CT main bed plate, with the hinge rotation center located on the side of the CT scanning bed. The extension plate has a foldable structure. The afterloading treatment cart includes an afterloading base, an afterloading lifting platform and an afterloading worktable. The afterloading lifting platform is located above the afterloading base and below the afterloading worktable. The afterloading worktable is connected to the top of the afterloading lifting platform via horizontal guide rails on both sides. The afterloading lifting platform is used to adjust the support height of the afterloading worktable. The main body of the gantry is located on one side of the CT main bed plate and is a conventional CT scanning large-aperture gantry. The gantry has a positioning groove at the bottom of the rear mounting side and a quick-locking mechanism for the gantry is provided at the bottom of the rear mounting base. The quick-locking mechanism for the gantry cooperates with the positioning groove. The rear loading workbench is equipped with a bed board quick-locking mechanism at one end. The bed board quick-locking mechanism is locked to the CT main bed board through a universal interface. The bed board quick-locking mechanism is adjusted and connected before the first use. In subsequent uses, it is directly and quickly connected to the bed board. The rear loading trolley is equipped with a foldable multi-position leg.

2. The CT scan bed support system for afterloading therapy according to claim 1, characterized in that, The quick-locking mechanism of the frame includes a fixed plate fixedly installed at one end of the bottom of the afterloading treatment cart. A positioning pin is provided at the center of one end of the fixed plate, and electromagnetic positioning pins are provided on both sides of the positioning pin. Adjustable positioning blocks are symmetrically arranged at the bottom of the fixed plate on both sides of the electromagnetic positioning pins.

3. The CT scan bed support system for afterloading therapy according to claim 1, characterized in that, The rear mounting worktable is symmetrically equipped with guide rails on both sides of its top, and sliders are connected to the guide rails. The rear mounting worktable is fixedly installed on the sliders. The bed board quick-locking mechanism is fixedly installed at the front end of the rear mounting worktable. The multi-position leg is installed at the rear end of the rear mounting worktable. A source device fixing device is provided between the two legs. The bed board quick-locking mechanism includes a positioning protrusion and an electromagnetic positioning pin. The positioning protrusion is aligned and positioned with the notch of the CT bed board. The electromagnetic positioning pin is fixed to the bed board after being energized, so that the rear mounting worktable and the CT main bed board are rigidly and synchronously connected.

4. The CT scan bed support system for afterloading therapy according to claim 1, characterized in that, The rear-mount lifting platform includes vertical guide rail slider structures on both sides. The guide rails are fixedly installed at the bottom of the rear-mount worktable. Electric push rods are symmetrically arranged on both sides of the rear-mount lifting platform. The electric push rods push the rear-mount worktable up and down in the vertical direction, and the rear-mount worktable can move synchronously with the CT scanning bed in the horizontal direction.

5. The CT scan bed support system for afterloading therapy according to claim 1, characterized in that, It also includes a tactile and sound feedback module, which is electrically connected to the quick-locking mechanism. When locked in place, it generates tactile and sound prompts, which are then displayed visually via LEDs.

6. The CT scan bed support system for afterloading therapy according to claim 1, characterized in that, It also includes a graded interlocking safety system, which includes a hardware and software dual interlocking module, a graded protection module, an emergency unlocking module, and an interlocking abnormality early warning module. The hardware interlocking cuts off the bed movement drive signal and automatically maintains the locked state when the power is off.

7. The CT scan bed support system for afterloading therapy according to claim 6, characterized in that, The interlocking anomaly early warning module monitors the locking status, interlocking signals, and displacement monitoring signals in real time, and provides audible and visual early warnings for locking looseness, signal abnormalities, module malfunctions, and excessive offset.

8. The CT scan bed support system for afterloading therapy according to claim 6, characterized in that, The graded protection module is configured with three protection levels, which include: Light protection, whereby the light protection is a light reminder; Moderate protection, which means prohibiting unnecessary movement; Heavy protection, which means completely locking the CT main bed board.

9. A method for supporting a CT scan bed for afterloading therapy, applied to the CT scan bed support system for afterloading therapy as described in any one of claims 1-8, characterized in that, Includes the following steps: Standard CT scan mode: The extension plate is unfolded and spliced ​​with the main CT bed to form a complete bed surface; Move the afterloading therapy cart to a non-working area, move the main bed horizontally and vertically, and perform a routine CT scan for localization. Afterloading mode: Rotate the extension plate 90° and fit it to the side of the CT main bed plate. Connect the afterloading cart to the CT main bed plate. Connect the afterloading worktable to the head of the CT bed plate through the bed plate quick locking mechanism. Connect the afterloading base to the main body of the gantry through the gantry quick locking mechanism. Treatment completion mode: After the doctor completes the loading and treatment operation, the locking state of the quick-locking mechanism of the gantry and the quick-locking mechanism of the bed board is released, the loading and treatment trolley is moved, the extension plate is unfolded, and it is spliced ​​with the CT main bed board to form a complete bed surface.

10. The CT scan bed support method for afterloading therapy according to claim 9, characterized in that, Place the applicator in the designated position, position the patient and fix it on the multi-position tripod. Use CT scan mode, with the mounting plate and CT plate connected, to perform a thin-slice positioning scan. Move the device along the Z-axis to meet the preset scan length to obtain the scan image. Transmit the scan image to the treatment planning system, where the doctor identifies the target area and calculates the dose.

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