Self-adaptive radiotherapy body position fixing device capable of generating deformation based on pressure sensing

Abstract

The invention relates to the technical field of medical instruments, and provides a self-adaptive radiotherapy body position fixing device capable of generating deformation based on pressure feeling in order to solve the problems that an existing radiotherapy body position fixing mode is insufficient in adaptability and cannot be reused, the self-adaptive radiotherapy body position fixing device comprises a body frame plate, and a plurality of fixing grooves distributed in a human-shaped array are formed in the body frame plate in a penetrating mode; the pressure sensing mechanism is arranged in each fixing groove in a penetrating manner, and is configured to sense the pressure distribution and the pressure of a contact area of the body of the radiotherapy patient and the body frame plate in real time, and generate elastic deformation of a corresponding degree based on pressure change so as to adaptively fit the contour of the body of the patient; and the thermoplastic film is detachably arranged on the body frame plate. Personalized adaptation of the body contour of the patient can be achieved, meanwhile, repeated utilization can be achieved, disposable consumables do not need to be replaced, the medical cost is greatly reduced, medical waste pollution is reduced, operation is convenient and fast, body position fixing and repeated calling can be rapidly completed, and radiotherapy accuracy, patient comfort and radiotherapy turnover efficiency are improved to a certain degree.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically to an adaptive radiotherapy positioning device based on pressure-sensing deformation. Background Technology

[0002] Radiation therapy, or radiotherapy for short, is a core tumor treatment method that uses radiation to destroy the DNA structure of tumor cells, inhibit their proliferation, and induce apoptosis, thereby achieving the goal of treating tumors. It is widely used in the treatment of various malignant tumors such as nasopharyngeal carcinoma, lung cancer, breast cancer, and esophageal cancer. It can be used as a radical treatment for the cure of early-stage tumors, as a palliative treatment to relieve pain, pressure, and other symptoms in patients with advanced tumors, and can also be used in combination with surgery, chemotherapy, and other treatment methods.

[0003] The core principle of radiotherapy is to precisely target tumor tissue while maximizing the protection of surrounding normal tissues and organs, thus minimizing adverse reactions. A key prerequisite for achieving this principle is ensuring the accuracy and stability of the patient's position during radiotherapy. Therefore, specialized positioning devices must be used to immobilize the patient during radiotherapy, restricting their movement to maintain the accuracy and stability of their position and ensure that radiation consistently and precisely targets the tumor.

[0004] Currently, there are three main types of positioning methods commonly used in clinical radiotherapy: First, a fixation frame and a thermoplastic film, which has good positioning accuracy but generally low patient comfort; second, a fixation frame and a vacuum pad (or foam), which has good accuracy and relatively high comfort; and third, a fixation frame, a vacuum pad (or foam), and a thermoplastic film, which has the highest positioning accuracy but is cumbersome to operate and expensive.

[0005] While the three radiotherapy positioning methods mentioned above can achieve basic positioning, they all have significant drawbacks: they lack personalized adaptive adjustment capabilities and cannot dynamically match the support state according to the different body contours of different patients, easily leading to local compression or fit gaps, affecting positioning stability and patient comfort; moreover, the core consumables have obvious defects. Vacuum pads have the risk of air leakage during long treatment courses, and foam cannot be adjusted again after shaping. Not only is the cost of a single use as high as thousands of yuan, but long-term use will significantly increase the cost of medical consumables. The non-reusable nature of these consumables also generates a large amount of medical waste, causing environmental pollution; at the same time, it is difficult to balance ease of operation with precision and stability. Either the combination of fixation frame and thermoplastic film has the problem of difficulty in correcting positioning deviations, or the combination of all three has the shortcomings of cumbersome procedures, long radiotherapy positioning time, and low diagnostic and treatment efficiency, all of which cannot meet the core clinical demands of the development of precision radiotherapy technology. Summary of the Invention

[0006] To address the aforementioned problems, this invention aims to provide an adaptive radiotherapy positioning device based on pressure-sensing deformation. This device can achieve personalized adaptation to the patient's body contour, is reusable, eliminates the need for multiple disposable consumables, significantly reduces medical costs and medical waste pollution, and is easy to operate, allowing for quick positioning and repeated use. This provides patients with a more comfortable positioning environment and improves the efficiency of radiotherapy treatment.

[0007] The main idea of ​​the technical solution adopted in this invention is as follows: By setting a human-shaped array of pressure-sensing mechanisms inside the frame plate, the invention achieves real-time acquisition of the patient's body contact pressure and dynamic adjustment of support deformation; by leveraging the linkage and cooperation of the main support component and the side support component and the elastic structure, the device can adaptively conform to the body contours of different patients, eliminating local pressure and fit gaps; a closed-loop adjustment system is constructed with a control module to ensure the stability and reusability of the body position fixation; at the same time, a reusable mechanical structure is used to replace disposable vacuum pads and foam consumables, and a detachable thermoplastic film is used to achieve fit and fixation at various positions on the body surface, ultimately achieving the goal of precise, comfortable, efficient, economical and environmentally friendly radiotherapy body position fixation.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An adaptive radiotherapy positioning device based on pressure-sensing deformation includes: The frame plate has multiple fixing slots arranged in a human-shaped array inside. The pressure sensing mechanism, which is installed inside each fixed slot, is configured to sense the pressure distribution and pressure magnitude in the contact area between the radiotherapy patient's body and the frame plate in real time, and generate corresponding elastic deformation based on the pressure changes to adaptively conform to the patient's body contour. Thermoplastic film, which can be detachably mounted on the frame plate.

[0009] Furthermore, based on the above technical solution, the pressure sensing mechanism includes: The main support assembly is slidably disposed inside the fixed groove, and a pressure sensor is installed at its top. Multiple side support components are located around the main support component; The displacement sensor is located on one side of the bottom of the main support assembly.

[0010] Furthermore, based on the above technical solutions, the main support component includes: The main support head has a first receiving groove inside, and a first elastic element is provided inside the first receiving groove; A transmission component is located on the lower side of the main support head, and a second elastic component is sleeved on it; The main support plate is slidably mounted on the transmission component and located on the upper side of the second elastic component; An electric push rod is located at the bottom of the main support rod, and its telescopic end is connected to the bottom of the main support plate.

[0011] Furthermore, based on the above technical solutions, the side support component further includes: The side support head has a second receiving groove inside, and a third elastic element is provided inside the second receiving groove; A side support plate is located below the side support head and is connected to the third elastic element; The first connecting rod is movably connected at one end to the bottom periphery of the transmission component, and at the other end to a slider; The second link is slidably connected to the first link at one end and hinged to the side support plate at the other end. The fourth elastic element is connected to the second connecting rod at one end and to the slider at the other end.

[0012] Furthermore, based on the above technical solution, the transmission component includes: A transmission plate is located at the telescopic end of the electric push rod, and multiple connecting slots are provided on its upper side. The transmission rod is located on the top surface of the transmission plate and extends upward.

[0013] Furthermore, through the above technical solution, the pressure sensing mechanism is in the shape of a regular hexagon.

[0014] Furthermore, the above technical solution also includes a control module, which is connected to the pressure sensor, displacement sensor, and electric actuator signal respectively.

[0015] The beneficial effects of this invention are: 1. This invention uses a pressure-sensing mechanism distributed in a human-shaped array, combined with the deformation coordination of the main support component and the side support component, to sense the pressure distribution and magnitude of the area in contact between the patient's body and the device in real time. Based on the pressure changes, it generates adaptive elastic deformation and automatically adjusts the support shape to form a unique personalized support surface that completely fits the patient's head, shoulders, chest and other body parts.

[0016] 2. This invention, through its control module, records the pressure and displacement data of each pressure-sensing mechanism when the patient first lies supine, creating a personalized body position profile. During subsequent radiotherapy, there is no need to repeat pressure measurements and adaptive adjustments; only the profile data needs to be retrieved, and the main and lateral support components are driven by electric push rods to accurately reproduce the initial adaptation profile, quickly completing body position fixation. This significantly shortens body position preparation time, improves the efficiency of clinical radiotherapy operations, and reduces the workload of medical staff.

[0017] 3. This invention features flexible dynamic adjustment capabilities. If a patient's body contour changes due to weight fluctuations, disease progression, or other special circumstances, there is no need to replace the device or remake the fixation structure. The pressure displacement acquisition and adaptive adjustment process can be restarted through the control module to generate new personalized support parameters, ensuring precise adaptation of body position fixation at different stages and significantly improving the clinical applicability and practicality of the device.

[0018] 4. After the fixation device of the present invention is used up, it can be easily restored to its initial state for repeated use by different patients, which greatly reduces the treatment cost of a single patient and can help hospitals and patients save huge medical consumable costs in the long term. At the same time, it reduces the large amount of medical waste generated after the use of traditional disposable consumables from the source. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the radiotherapy positioning device of the present invention; Figure 2 This is a schematic diagram of the application structure of the radiotherapy positioning fixation device of the present invention; Figure 3 For the present invention Figure 2 A frontal view diagram; Figure 4 This is a schematic diagram of the structure of the frame plate of the present invention; Figure 5 For the present invention Figure 1 Cross-sectional structural diagram; Figure 6 For the present invention Figure 5 Enlarged view of point A; Figure 7 This is a schematic diagram of the pressure sensing mechanism of the present invention; Figure 8 This is a schematic cross-sectional view of the pressure sensing mechanism of the present invention; Figure 9 This is a schematic diagram of the transmission component structure of the present invention; Figure 10 This is a schematic diagram of the side support plate structure of the present invention; Figure 11 This is a schematic diagram showing the connection relationship between the first link and the second link of the present invention; Figure 12 This is a schematic diagram showing the connection relationship between the first connecting rod and the slider in this invention; Figure 13 This is a schematic diagram of the second connecting rod structure of the present invention.

[0020] The components include: 1. Body frame plate; 11. Fixing groove; 12. Leg placement groove; 13. Fixing seat; 14. Displacement groove; 2. Pressure sensing mechanism; 3. Main support assembly; 31. Main support head; 311. First receiving groove; 32. First elastic element; 33. Transmission component; 331. Transmission plate; 332. Connecting groove; 333. Transmission rod; 34. Second elastic element; 35. Main support plate; 36. Electric push rod; 37. Pressure sensor; 4. Side support assembly; 41. Side support head; 411. Second receiving groove; 42. Third elastic element; 43. Side support plate; 431. Hinge seat; 44. First connecting rod; 45. Slider; 46. Second connecting rod; 47. Fourth elastic element; 5. Displacement sensor; 6. Thermoplastic film; 7. Control module. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] The inventors' research revealed that while commonly used radiotherapy positioning methods can achieve basic positioning, they generally have significant drawbacks: they lack personalized adaptive adjustment capabilities and cannot dynamically match the support state according to the different body contours of different patients, easily leading to local compression or fit gaps, affecting positioning stability and patient comfort; moreover, the core consumables have obvious defects, and long-term use will significantly increase the cost of medical consumables and generate a large amount of medical waste, causing environmental pollution; at the same time, it is difficult to balance ease of operation and precision stability. Either the combination of fixation frame and thermoplastic film has the problem of difficulty in correcting positioning deviations, or the combination of all three has the shortcomings of cumbersome procedures, long preoperative preparation time, and low diagnostic and treatment efficiency, all of which cannot meet the core clinical demands of the development of precision radiotherapy technology.

[0023] Based on the above findings, this application proposes an adaptive radiotherapy positioning device that uses pressure-sensing deformation to achieve personalized adaptation to the patient's body contour. It is also reusable, eliminating the need to replace disposable consumables, significantly reducing medical costs and medical waste pollution. Furthermore, it is easy to operate, allowing for quick positioning and repeated use, thereby improving the accuracy of radiotherapy, patient comfort, and treatment turnover efficiency.

[0024] Example See Figures 1-13This application discloses an adaptive radiotherapy positioning device based on pressure-sensing deformation, applicable to, but not limited to, radiotherapy positioning for head and neck tumors and thoracic and abdominal tumors, such as nasopharyngeal carcinoma, lung cancer, and gastrointestinal tumors. It enables precise adaptation of the patient's position, real-time pressure monitoring, and dynamic fixation, ensuring positional stability during radiotherapy and improving radiotherapy accuracy. The adaptive radiotherapy positioning device based on pressure-sensing deformation described in this embodiment includes a frame plate 1, a pressure-sensing mechanism 2, a thermoplastic film 6, and a control module 7.

[0025] The frame plate 1 serves as the supporting foundation of the device. It is integrally molded from carbon fiber composite material and has a hollow structure. Multiple human-shaped arrayed fixing slots 11 are perforated within the frame plate 1. The distribution trajectory of the fixing slots 11 matches the contours of an adult's head, shoulders, chest, and surrounding torso. Each fixing slot 11 has a regular hexagonal cross-section to accommodate the hexagonal pressure-sensing mechanism 2. The frame plate 1 also includes leg placement slots 12 for restraining the patient's legs.

[0026] Next, multiple pressure sensing mechanisms 2 are provided, each slidingly inserted into the interior of each fixed slot 11. They are configured to sense the pressure distribution and magnitude of the contact area between the radiotherapy patient's body and the frame plate 1 in real time, and generate corresponding elastic deformation based on pressure changes to adaptively conform to the patient's body contour. Each pressure sensing mechanism 2 includes a main support component 3, a side support component 4, a displacement sensor 5, and a pressure sensor 37.

[0027] Furthermore, each pressure sensing mechanism 2 includes a main support assembly 3 and six side support assemblies 4. The six side support assemblies 4 are evenly distributed around the main support assembly 3, and the included angle between adjacent side support assemblies 4 is 60°. The overall shape is a regular hexagon, ensuring the stability and uniformity of the support.

[0028] The main support assembly 3 is slidably disposed at the center of the fixed groove 11 to bear the main pressure of the patient's body, and includes a main support head 31, a first elastic element 32, a transmission element 33, a second elastic element 34, a main support plate 35, and an electric push rod 36.

[0029] Specifically, the main support head 31 is slidably disposed inside the fixing groove 11. It is a rigid hexagonal hollow structure that comes into direct contact with the patient's body. Its outer side is wrapped with a layer of silicone material, which has good biocompatibility and softness, avoiding pressure on the patient's skin. The main support head 31 has a first receiving groove 311 axially formed inside. The first receiving groove 311 is a cylindrical blind hole, and a first elastic element 32 is installed inside it. The first elastic element 32 is a stainless steel compression spring. Its top end is fixed to the inner wall of the first receiving groove 311, and its bottom end is connected to the top end of the transmission component 33, so as to realize the elastic buffering of the main support head 31.

[0030] It should be noted that a pressure sensor 37 is installed at the center of the top surface of the main support head 31. The pressure sensor 37 is a miniature thin-film pressure sensor, model FSR402, used to sense the pressure of the patient's body in contact with the main support head 31 in real time. The pressure sensor 37 is electrically connected to the control module 7.

[0031] The transmission component 33 is slidably disposed inside the fixed groove 11, and includes a transmission plate 331 and a transmission rod 333. The transmission plate 331 and the transmission rod 333 are integrally formed. The transmission plate 331 is a circular steel plate with six evenly spaced connecting grooves 332 on its periphery. These connecting grooves 332 are orifice-shaped grooves used for movably connecting the side support assembly 4. The transmission rod 333 is a cylindrical rod, vertically disposed at the center of the top surface of the transmission plate 331, extending upwards and inserting into the first receiving groove 311 of the main support head 31. A second elastic element 34 is sleeved on the outer side of the transmission rod 333.

[0032] The main support plate 35 is a circular plate with a circular through hole in the center. It is slidably sleeved on the transmission rod 333 through the through hole and located on the upper side of the second elastic member 34. The top surface of the main support plate 35 is fixedly connected to the first elastic member 32, and the bottom surface is fixedly connected to the second elastic member 34 and slidably connected inside the fixing groove 11.

[0033] It is worth noting that this is a two-stage buffer system. In the first stage, the human body first presses on the main support head 31, which pushes the main support plate downwards on the transmission rod via the first elastic element 32. In the second stage, when the main support plate slides down to a certain position, it compresses the second elastic element, which in turn pushes the transmission plate downwards within the fixed groove, thereby actuating the electric push rod. It is worth noting that the main support component 3 adopts a two-stage elastic buffer.

[0034] Specifically, in the first-stage buffering phase, the patient's body pressure first acts on the main support head 31. The main support head 31 is displaced downward along the fixed groove 11 under pressure, and the first elastic element 32 in the first receiving groove 311 inside is compressed accordingly. The elastic deformation of the first elastic element 32 absorbs part of the pressure impact, and at the same time, the first elastic element 32 transmits the remaining pressure to the main support plate 35, driving the main support plate 35 to slide downward along the transmission rod 333.

[0035] In the second-stage buffering phase, when the main support plate 35 slides down to a certain travel position, its bottom surface contacts the second elastic element 34 and continuously compresses the second elastic element 34. The pressure is further buffered by the secondary elastic deformation of the second elastic element 34, achieving graded pressure attenuation. During this process, the axial thrust generated by the pressure on the second elastic element 34 drives the transmission component 33 to slide downward along the fixed groove 11, thereby driving the telescopic end of the electric push rod 36, which is fixedly connected to the bottom surface of the transmission plate 331, to move down synchronously. At this time, the electric push rod 36 is in a follow-up state, and the smooth connection of the buffering transmission process is achieved through displacement adaptation.

[0036] The aforementioned secondary elastic buffer can effectively reduce the instantaneous pressure impact when the patient is positioned, avoid pressure damage to the patient's skin caused by rigid contact, and ensure the stability of pressure transmission, laying the foundation for subsequent data acquisition by the pressure sensor 37.

[0037] The electric actuator 36 is a miniature electric actuator, model XTL100, which is fixedly mounted on the bottom mounting base of the corresponding fixing groove 11 at the bottom of the main support plate 35. The telescopic end of the electric actuator 36 faces upward and is fixedly connected to the center position of the bottom surface of the transmission plate 331 by bolts, which can drive the transmission plate 331 to move up and down axially along the transmission rod 333.

[0038] It should be noted that the displacement sensor 5 is a miniature pull-wire displacement sensor, model WPS-M-20mm. The displacement sensor 5 is installed at the bottom of the fixing groove 11 via a mounting bracket and is located on one side of the electric push rod 36. Its pull wire end is fixedly connected to the bottom surface of the transmission plate 331. When the main support plate 35 slides axially, it will drive the transmission plate 331 to move synchronously, thereby pulling the pull wire of the displacement sensor 5 to realize the real-time acquisition of displacement data. The signal cable of the displacement sensor 5 is connected to the control module 7 to provide feedback on the deformation displacement of the main support assembly 3.

[0039] Next, the side support assembly 4 is slidably disposed on the periphery of the main support assembly 3 to assist in supporting the patient's body and improve fit. It includes a side support head 41, a third elastic element 42, a side support plate 43, a first connecting rod 44, a slider 45, a second connecting rod 46, and a fourth elastic element 47.

[0040] Specifically, the side support head 41 is slidably disposed inside the fixing groove 11, and its structure and material are the same as those of the main support head 31. A second receiving groove 411 is axially formed inside the side support head 41. The second receiving groove 411 is a cylindrical blind hole, inside which a third elastic element 42 is installed. The third elastic element 42 is a stainless steel compression spring, with its top end fixed to the inner wall of the second receiving groove 411 and its bottom end connected to the top surface of the side support plate 43, thus achieving elastic buffering of the side support head 41. The side support plate 43 is a circular plate, slidably connected inside the fixing groove 11, with its top surface connected to the top end of the third elastic element 42, and a hinge seat 431 located at the center of its bottom surface.

[0041] One end of the first connecting rod 44 is hinged to the connecting groove 332 of the transmission plate 331, and the other end is fixedly connected to the slider 45. A sliding groove is formed on the first connecting rod 44. One end of the second connecting rod 46 passes through the slider 45 and is slidably connected to the first connecting rod 44, and can slide back and forth along the sliding groove; the other end is hinged to the hinge seat 431 on the bottom surface of the side support plate 43 through a pin. The fourth elastic element 47 is a stainless steel tension spring, one end of which is fixedly connected to the inner wall of the second connecting rod 46, and the other end is fixedly connected to the end of the slider 45, and is used to provide a restoring elastic force.

[0042] It should be noted that the fixing groove 11 where the main support head 31 is located is provided with displacement grooves 14 on the periphery of the fixing groove 11 where the side support head 41 is located. The first connecting rod 44 passes through the displacement grooves 14 and is hinged to the connecting groove 332 of the transmission plate 331. When the transmission plate 331 of the main support assembly 3 moves axially up and down with the extension and retraction of the electric push rod 36 or the pressure of the patient, the first connecting rod 44 can move up and down and rotate synchronously along the displacement grooves 14 to avoid interference with the inner wall of the fixing groove 11 and ensure smooth transmission.

[0043] When the main support head 31 is pressed down or the electric push rod 36 drives the transmission plate 331 to move downward, the transmission plate 331 drives one end of the first connecting rod 44 to move downward synchronously through the connecting groove 332. The first connecting rod 44 slides downward along the displacement groove 14 and rotates around the hinge point of the connecting groove 332. The slider 45 fixed at the other end slides along the slide groove of the first connecting rod 44. The sliding of the slider 45 drives one end of the second connecting rod 46 to move back and forth along the slide groove, and the other end rotates around the hinge seat 431 on the bottom surface of the side support plate 43, thereby pushing the side support plate 43 along the axis of the corresponding fixed groove 11. Sliding downwards, the side support plate 43 compresses the third elastic element 42, ultimately driving the side support head 41 to move downwards synchronously, achieving coordinated downward pressure and contact with the main support head 31; conversely, when the transmission plate 331 moves upwards, the first connecting rod 44 slides upwards along the displacement groove 14 and rotates in the opposite direction, pulling the side support plate 43 upwards through the slider 45 and the second connecting rod 46, the third elastic element 42 resets and drives the side support head 41 to move upwards synchronously, and at the same time the fourth elastic element 47 pulls the second connecting rod 46 to reset through its own tensile elasticity, ensuring that the side support assembly 4 moves smoothly and resets accurately.

[0044] Next, the thermoplastic film 6 is made of medical low-temperature thermoplastic film. This material has good plasticity after softening and moderate hardness after cooling, allowing it to conform to the patient's body contour for rigid fixation. It also has a certain degree of breathability and biocompatibility. The thermoplastic film 6 covers the patient's radiotherapy area and adjacent areas. The body frame plate 1 is provided with a fixing seat 13, and the edge of the thermoplastic film 6 is provided with multiple buckle heads. The thermoplastic film 6 and the body frame plate 1 are detachably connected by the buckle heads engaging with the fixing seat 13.

[0045] It is worth noting that the control module 7 adopts a single-chip microcomputer control system, integrating a signal acquisition module, a data processing module, a drive module, and a power supply module. The entire module is encapsulated in a metal casing and fixedly installed on the bottom side of the frame plate 1. The signal connection relationships of the control module 7 are as follows: ① Signal input terminal: connected to the pressure sensor 37 and displacement sensor 5 of the pressure sensing mechanism 2 via shielded cables to receive pressure and displacement data; ② Signal output terminal: connected to the electric push rod 36 of the main support assembly 3 via a drive circuit to output control signals to drive the electric push rod 36 to extend or retract; ③ Power supply module: powered by a 24V DC power supply, and equipped with a backup battery to ensure normal operation of the device during power outages. In addition, the control module 7 is also equipped with an RS485 communication interface, which can be connected to the main control system of the radiotherapy equipment to achieve data interaction and collaborative control.

[0046] Application Examples: This embodiment uses a male nasopharyngeal carcinoma patient admitted to the radiotherapy department of a tertiary hospital as the application subject, and the steps are as follows: (I) First-time radiotherapy - Patient data collection and contour memory Step 1: The patient lies flat on the frame board 1 with the legs placed in the leg placement slot 12 for limitation. The body weight drives the main support head 31 and the side support head 41 of each pressure sensing mechanism 2 to slide down along the fixed slot 11 axially.

[0047] Step 2: The main support head 31 slides down to compress the internal first elastic element 32, and the top pressure sensor 37 collects pressure data and transmits it to the control module 7; the pressure is transmitted to the transmission rod 333 through the first elastic element 32, which drives the transmission element 33 to slide down as a whole, compressing the outer second elastic element 34 and driving the main support plate 35 to slide down synchronously. At this time, the electric push rod 36 does not extend or retract actively, and the transmission plate 331 slides down to pull the displacement sensor 5 pull wire, and the displacement data is transmitted to the control module 7 synchronously.

[0048] Step 3: The control module 7 binds the pressure and displacement data of each pressure sensing mechanism 2 with the patient's identity information, generates a three-dimensional contour model, stores it in the database, and forms a personalized file.

[0049] (II) Subsequent radiotherapy - data retrieval and contour reconstruction Step 1: Medical staff enter the patient's identity information, and control module 7 retrieves the patient's initial personalized data file.

[0050] Step 2: The control module 7 outputs a command to the corresponding electric push rod 36 according to the displacement of the main support head 31 in the file, driving the telescopic end to extend and retract, thereby raising and lowering the transmission plate 331 and the transmission rod 333, pushing the main support head to the initial position, and the first and second elastic elements return to the initial compression state; the displacement sensor 5 verifies the displacement in real time, and drives the electric push rod to make fine adjustments and compensation when the deviation exceeds ±0.1mm.

[0051] Step 3: The transmission plate 331 lifts and lowers, driving the first connecting rod 44 to rotate. Through the slider 45 and the second connecting rod 46, the side support plate 43 and the side support head 41 are driven to accurately reset to the initial position. The third and fourth elastic elements synchronously return to the initial state, and the main and side support heads jointly reproduce the personalized fit contour.

[0052] Step 4: The patient lies flat on the reproduced contour for precise fitting, and the thermoplastic film 6 is fixed with buckles.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An adaptive radiotherapy positioning device based on pressure-sensing deformation, characterized in that, include: The frame plate (1) has multiple fixing slots (11) arranged in a human-shaped array through its interior. The pressure sensing mechanism (2) is installed inside each fixed slot (11) and is configured to sense the pressure distribution and pressure magnitude of the contact area between the radiotherapy patient's body and the frame plate (1) in real time, and generate corresponding elastic deformation based on the pressure change to adaptively fit the patient's body contour. Thermoplastic film (6) is detachably mounted on frame plate (1).

2. The adaptive radiotherapy positioning device based on pressure-sensing deformation according to claim 1, characterized in that, The pressure-sensing mechanism (2) includes: The main support assembly (3) is slidably disposed inside the fixed groove (11), and a pressure sensor (37) is disposed at its top. Multiple side support components (4) are disposed on the periphery of the main support component (3); The displacement sensor (5) is located on one side of the bottom of the main support assembly (3).

3. The adaptive radiotherapy positioning device based on pressure-sensing deformation according to claim 2, characterized in that, The main support component (3) includes: The main support head (31) has a first receiving groove (311) inside, and a first elastic element (32) is provided inside the first receiving groove (311). The transmission component (33) is located on the lower side of the main support head (31), and a second elastic component (34) is sleeved on it. The main support plate (35) is slidably mounted on the transmission member (33) and located on the upper side of the second elastic member (34); An electric push rod (36) is located at the bottom of the main support rod (35), and its telescopic end is connected to the bottom of the main support plate (35).

4. The adaptive radiotherapy positioning device based on pressure-sensing deformation according to claim 3, characterized in that, The side support assembly (4) includes: The side support head (41) has a second receiving groove (411) inside, and a third elastic element (42) is provided inside the second receiving groove (411). A side support plate (43) is disposed below the side support head (41) and connected to the third elastic member (42); The first connecting rod (44) is movably connected at one end to the bottom periphery of the transmission component (33), and the other end is connected to a slider (45). The second link (46) is slidably connected at one end to the first link (44) and hinged at the other end to the side support plate (43); The fourth elastic element (47) is connected at one end to the second connecting rod (46) and at the other end to the slider (45).

5. The adaptive radiotherapy positioning device based on pressure-sensing deformation according to claim 4, characterized in that, The transmission component (33) includes: A transmission plate (331) is provided at the telescopic end of the electric push rod (36), and multiple connecting slots (332) are provided on its upper side. The transmission rod (333) is located on the top surface of the transmission plate (331) and extends upward.

6. The adaptive radiotherapy positioning device based on pressure-sensing deformation according to claim 5, characterized in that: The pressure-sensing mechanism (2) is hexagonal.

7. The adaptive radiotherapy positioning device based on pressure-sensing deformation according to claim 6, characterized in that, It also includes a control module (7), which is connected to the pressure sensor (37), the displacement sensor (5) and the electric push rod (36) respectively.

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