A breast cancer radiotherapy positioning device and method based on human body adaptive shaping

Abstract

This application provides a breast cancer radiotherapy positioning device and method based on human body adaptive shaping, belonging to the technical field of auxiliary positioning equipment. The device includes: a body positioning frame for fixing the patient's lying position; a back fixation part, which is mounted on the body positioning frame and can adaptively shape according to the patient's head and hands; and a thermoplastic film body structure, which includes a thermoplastic film body and a constant force connector. The method includes the following steps: Step S1, the patient lies on the body positioning frame with both hands raised; Step S2, expanding foam is used to fill the gaps on both sides of the patient's head, back, and arms; Step S3, the thermoplastic film body structure is fabricated and adaptively shaped; Step S4, the thermoplastic film body structure is connected by a constant force connector. This solves the technical problem that traditional breast cancer radiotherapy positioning devices cannot closely fit the patient's body to ensure the patient's stability during treatment.

Description

Technical Field

[0001] This application relates to the technical field of auxiliary positioning equipment for breast cancer radiotherapy, specifically a breast cancer radiotherapy positioning device and method based on human body adaptive shaping. Background Technology

[0002] A radiotherapy positioning device is a crucial piece of equipment used to precisely locate and calibrate the patient's position during radiotherapy. Its main function is to ensure that radiation accurately and safely targets the tumor lesion while minimizing damage to surrounding healthy tissues. The device fits snugly against the patient's body, ensuring a stable position during treatment and preventing changes in posture from affecting the treatment outcome. Its operation is generally simple and easy to understand, allowing medical staff to quickly learn and master its use. Furthermore, customized radiotherapy positioning devices can be made according to the patient's specific condition and treatment needs to ensure optimal treatment results. With the continuous development of medical technology, radiotherapy positioning devices will be constantly upgraded and improved, bringing hope and opportunities for recovery to more cancer patients. Current breast cancer radiotherapy positioning devices mostly use a supine position with a heated thermoplastic membrane structure. The thermoplastic membrane is a film made of polymer material that softens and covers the patient's body surface. After cooling and hardening, it is shaped and fixed in place. The thermoplastic membrane also has a certain inhibitory effect on breathing. It can effectively stabilize the patient's chin and neck movement, improving accuracy for patients with supraclavicular lymph node irradiation. However, the aforementioned thermoplastic membrane positioning has the following drawbacks: relying solely on the thermoplastic membrane structure for fixation, without other fixation mechanisms to restrict body movement, results in low accuracy when repeatedly fixing the back position. Furthermore, during treatment, if the patient's body shape changes significantly, such as gaining weight or experiencing noticeable weight loss, the thermoplastic membrane, after fixation, will not adapt to the patient's upper contour, creating a large gap between the membrane and the patient's upper body, affecting the fixation effect. In such cases, a new membrane needs to be fabricated for fixation. Traditional back fixation also utilizes a vacuum pad, a sealed soft capsule filled with micro-foam particles. The patient lies on the sealed capsule, and after vacuuming, the patient's back can be shaped and fixed. While vacuum pads effectively fix the patient's position and prevent movement during radiotherapy, and can be reused, prolonged use can lead to air leakage and deformation, resulting in decreased treatment accuracy and, in severe cases, requiring a complete redesign of the treatment plan. Soft bagging cannot fix the patient's arm; the arm is fixed by a hand support, which requires recording the angle and height of the hand support, resulting in a large number of data to be recorded and poor effectiveness.

[0003] Therefore, it is necessary to invent a device that can closely fit the patient's body during radiotherapy and ensure that the patient maintains a stable position during the treatment process. Summary of the Invention

[0004] This application provides a breast cancer radiotherapy positioning device and method based on human body adaptive shaping to solve the technical problem that traditional breast cancer radiotherapy positioning devices cannot closely fit the patient's body during radiotherapy to ensure the patient remains stable during treatment.

[0005] To achieve the above objectives, this application provides the following technical solution: A breast cancer radiotherapy positioning device based on human body adaptive shaping, comprising: A body positioning frame, used to fix a patient's lying position; A back fixation part is mounted on the body positioning frame, and the back fixation part can be adaptively shaped according to the patient's head and hands; A thermoplastic film body that can adaptively shape according to the patient's face and chest, and can be pressed and covered on the patient's face and chest; A constant force connector is used to mount the thermoplastic film body onto the body positioning frame.

[0006] Furthermore, the back fixing part includes a foam soft bag, which is fixed on the body positioning frame, and the foam soft bag is provided with a sealable opening.

[0007] Furthermore, the foamed soft capsule includes one or more of a head soft capsule, an arm soft capsule, and a back soft capsule, wherein the head soft capsule can be used to support the patient's head, the arm soft capsule can be used to support the patient's arm, and the back soft capsule can be used to support the patient's back.

[0008] Furthermore, the body positioning frame is provided with a fixing clamp assembly, and the side of the foam soft capsule is provided with a clamping edge, which is detachably connected to the fixing clamp assembly.

[0009] Furthermore, the thermoplastic film body includes a face and neck film and a chest film, both of which are made of thermoplastic material. Connecting positions are provided on both sides of the face and neck film and the chest film, and the connecting positions can be connected to the constant force connector.

[0010] Furthermore, the face and neck membrane and the pleural membrane are integrally formed.

[0011] Furthermore, both the face and neck membrane and the pleura are provided with a number of transverse tensile ribs and a number of longitudinal tensile ribs, which are arranged in an alternating pattern.

[0012] Furthermore, the constant force connector includes a base column, a movable column, and a constant force spring. The upper end of the movable column is detachably connected to the thermoplastic film body, and the lower end of the base column is detachably connected to the body positioning frame. The movable column is slidably fitted into the base column along the axial direction. The constant force spring is connected to the base column and the movable column, and the constant force spring maintains a constant force to make the movable column tend to move downward.

[0013] Furthermore, a connecting shaft is provided at the upper part of the movable column, one end of the constant force spring is wound on the connecting shaft, and the other end of the constant force spring is fixedly connected to the lower part of the bottom column.

[0014] A method for radiotherapy localization of breast cancer based on human body adaptive shaping includes the following steps: Step S1: The patient lies on the postural fixation frame with both hands raised. Step S2: Use expanding foam to fill a soft capsule, and fill the gaps on both sides of the patient's head, back and arms through the soft capsule. After the expanding foam self-adapts and hardens, it forms placement slots for the patient's head, back and arms. Step S3: Fabricate the thermoplastic film body structure. Place the thermoplastic film body in a constant temperature water tank for immersion. After taking it out, lay it flat on the patient's face and chest. The thermoplastic film body adapts to the shape. In step S4, the thermoplastic film body is connected to the body positioning frame through a constant force structure, and the thermoplastic film body is pressed onto the patient.

[0015] The breast cancer radiotherapy positioning device and method based on human body adaptive shaping provided in this application embodiment has the following technical advantages compared with the prior art: This application achieves comprehensive fixation of the patient's back, head, arms, face, and chest through a combination design of a foam soft capsule and a thermoplastic film body. The foam soft capsule can adaptively shape according to the patient's body shape, completely wrapping the head, arms, and back to form a support mold that closely conforms to the patient's body contours; the thermoplastic film body covers the face and chest, fixes the chin position, and controls respiratory movements. The two are connected to the positioning frame through matching holes to form a composite fixation system, which significantly improves the accuracy of repeated positioning fixation and solves the technical defects of traditional single thermoplastic film body fixation, such as lack of support for the back and low accuracy of position repetition. The foam material actively shapes, overcoming the inherent defects of negative pressure vacuum pads; the constant force connector allows the thermoplastic film body to be floatably mounted on the positioning frame and provides constant downward pressure, ensuring that the thermoplastic film body always adheres to the patient's body surface. When the patient's body shape changes (such as weight gain or loss), the constant force connector can slide along the bottom column axis, automatically adjusting the distance between the thermoplastic film body and the patient's body surface, maintaining a constant adhesion pressure, and avoiding the problems of gap formation and decreased fixation effect after the traditional thermoplastic film body is fixed. Based on the above, the present invention solves the technical problem that traditional breast cancer radiotherapy positioning devices cannot closely fit the patient's body during breast cancer radiotherapy to ensure the patient remains stable during treatment.

[0016] It should be understood that both the foregoing general description and the following detailed description are for illustrative purposes and do not necessarily limit the scope of this disclosure. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the subject matter of this disclosure. Furthermore, the specification and drawings serve to explain the principles of this disclosure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application.

[0018] Figure 1 This is a schematic diagram of the state three-dimensional structure of an embodiment of this disclosure; Figure 2 This is a three-dimensional structural diagram of the body positioning fixation frame according to an embodiment of the present disclosure; Figure 3 This is a three-dimensional structural diagram of the rear fixing part according to an embodiment of the present disclosure; Figure 4 This is a three-dimensional structural diagram of the thermoplastic film body according to an embodiment of the present disclosure; Figure 5 This is a three-dimensional structural diagram of the constant force connector according to an embodiment of this disclosure; Figure 6 This is a cross-sectional three-dimensional structural view of the constant force connector according to an embodiment of this disclosure; Figure 7 This is a flowchart illustrating the positioning method steps in an embodiment of this disclosure.

[0019] icon: 100-Positioning fixation frame, 200-Back fixation part, 300-Thermoplastic film body, 400-Constant force connector, 101-Fixed clamp assembly, 102-First hanger, 103-Second hanger, 104-Upper clamp, 105-Lower clamp, 106-Positioning post, 107-Modible mounting hole, 108-Pull hole, 109-Handle, 201-Head soft pouch, 202-Arm soft pouch, 203-Back soft pouch, 204-Opening, 205-Clamping edge, 206-Positioning hole, 301-Face and neck membrane, 302-Pleural membrane, 303-Connecting position, 401-Bottom post, 402-Modible post, 403-Constant force spring, 404-First hook, 405-Second hook. Detailed Implementation

[0020] This invention discloses a breast cancer radiotherapy positioning device and method based on human body adaptive shaping, which relates to the technical field of auxiliary positioning equipment for breast cancer radiotherapy, in order to solve the technical problem that existing traditional breast cancer radiotherapy positioning devices cannot closely fit the patient's body during breast cancer radiotherapy to ensure the patient remains stable during treatment.

[0021] To make the technical solutions and advantages of the embodiments of this application clearer, the exemplary embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0022] Example 1 Please see Figures 1 to 6 A breast cancer radiotherapy positioning device based on human body adaptive shaping, comprising: The positioning frame 100 is used to stabilize the patient's lying position. Made of carbon fiber, it offers excellent X-ray permeability, ensuring that radiotherapy rays accurately target the lesion area, improving treatment accuracy and safety. The carbon fiber material also significantly reduces the overall weight of the frame, facilitating movement. The recessed front section of the positioning frame 100 accommodates the back fixation unit 200, while the rear section features a stepped surface, ensuring it is flush with the back fixation unit 200 when not filled with expanding foam. This provides a smooth surface for the patient, offering a stable lying support platform. Handles 109 are located at the four corners of the positioning frame 100, further facilitating its movement and enhancing ease of use.

[0023] The back fixation part 200 is installed on the body positioning frame 100. The back fixation part 200 can be adaptively shaped according to the patient's head and hands to form a support structure that fits the contour of the patient's back. For multiple uses by the same patient, the back fixation part 200 is fixed by repeated positioning. When the patient uses it again, the back fixation part 200 is placed in the same position on the body positioning frame 100, which can further facilitate use.

[0024] The thermoplastic film body 300 can be adaptively shaped to fit the patient's face and chest, and can be pressed onto the patient's face and chest. At room temperature, the thermoplastic film body 300 maintains a stable shape and sufficient mechanical strength. When heated to a specific temperature (usually 60-80°C), the material softens and can be deformed under external force to conform to the surface contour of the covering. Specifically, after cooling to room temperature, the material hardens again, maintaining the shaped form and forming a rigid fixed shell that conforms to the contour of the patient's body surface.

[0025] The constant force connector 400 and the thermoplastic film body 300 are installed on the positioning frame 100 through the constant force connector 400, so that the thermoplastic film body 300 can be pressed and covered on the patient's face and chest.

[0026] In this embodiment, the back fixation part 200 includes a foam soft capsule, which is fixed to the body positioning frame 100. The foam soft capsule has a sealable opening 204. The foam soft capsule is made of medical-grade flexible material, possessing good flexibility. The capsule structure has small vent holes to accommodate the expansion pressure of the foam material and maintain shape stability. The sealable opening 204 is used to inject foam material into the capsule, and then seals it after injection to prevent leakage. Specifically, the foam soft capsule includes one or more of a head soft capsule 201, an arm soft capsule 202, and a back soft capsule 203. The head soft capsule 201 can be used to support the patient's head, the arm soft capsule 202 can be used to support the patient's arm, and the back soft capsule 203 can be used to support the patient's back. The head soft capsule 201, arm soft capsule 202, and back soft capsule 203 are interconnected, allowing for multiple foaming and shaping operations with a single injection of foam material, simplifying the operation and improving efficiency. In this embodiment, a clearance space is provided between the head soft capsule 201 and the arm soft capsule 202. The clearance space is used to make way for the connection structure between the thermoplastic film body 300 and the body positioning frame 100.

[0027] In this embodiment, a fixing clamp assembly 101 is provided on the body positioning frame 100, and a clamping edge 205 is provided on the side of the foam soft capsule, which is detachably connected to the fixing clamp assembly 101. Specifically, the fixing clamp assembly 101 is configured in two sets, which are symmetrically arranged on both sides of the longitudinal direction of the body positioning frame 100. They are made of rigid materials. The fixing clamp assembly 101 includes an upper clamp 104 and a lower clamp 105. The lower clamp 105 is fixed on the body positioning frame 100, and the upper clamp 104 is detachably attached to the lower clamp 105. The lower end of the upper clamp 104 is provided with several clearance holes, and the lower clamp 105 is provided with several positioning posts 106. The clamping edge 205 is provided with several positioning holes 206. When clamping, the positioning posts 106 pass through the positioning holes 206 and enter the clearance holes. The upper clamp 104 is made of rubber material, and the positioning holes 206 and the positioning posts 106 are tightly fitted. The upper clamp 104 and the lower clamp 105 can be disassembled and assembled by the manual force of medical staff, reducing the use of fasteners and improving efficiency. A pull hole 108 is provided at one end of the upper clamp 104 to facilitate medical staff to pull open the upper clamp 104, further improving ease of use.

[0028] In this embodiment, the thermoplastic film body 300 includes a face and neck membrane 301 and a pleural membrane 302. Both the face and neck membrane 301 and the pleural membrane 302 are made of thermoplastic material. Connecting positions 303 are provided on both sides of the face and neck membrane 301 and the pleural membrane 302, which can be connected to the constant force connector 400. In this embodiment, the face and neck membrane 301 and the pleural membrane 302 are integrally formed. This integrated design eliminates the connection gaps and relative displacement risks that may occur with a split structure, allowing the thermoplastic film body 300 to form a continuous fixed curved surface after shaping, extending from the face to the chest, while simultaneously providing stable restraint for the chin, neck, and ribcage, significantly improving the overall stability and reliability of the fixation system. Both the face and neck membrane 301 and the pleural membrane 302 have several transverse tensile ribs (not shown) and several longitudinal tensile ribs (not shown), which are arranged in a crisscross pattern to form a grid-like reinforcing structure. The tensile reinforcement lines are made of high-strength fiber materials (such as carbon fiber or polymer fiber) and embedded inside the thermoplastic substrate, forming a strong composite structure with the substrate. Transverse tensile reinforcement lines (not shown) are distributed horizontally, primarily resisting lateral tensile deformation of the thermoplastic film body during shaping and use; longitudinal tensile reinforcement lines (not shown) are set along the patient's head-to-toe direction, primarily resisting longitudinal tensile deformation. This crisscrossing grid structure enhances the mechanical strength of the thermoplastic film body 300 in all directions, maintaining a uniform thickness distribution during the stretching and shaping process after heating and softening, avoiding insufficient strength due to localized thinness or poor adhesion due to excessive thickness. After cooling and hardening, the tensile reinforcement lines form an internal skeleton, preventing creep deformation or cracking of the thermoplastic film body 300 during long-term use, repeated sterilization, or changes in ambient temperature, extending the device's lifespan and ensuring consistency and repeatability of patient positioning during multiple treatments. The resistance to lateral tensile deformation has a further function: when the temperature of the thermoplastic film body 300 is high, the constant force connector 400 can be used to directly connect the thermoplastic film body 300 to the body fixation frame 100. This allows the thermoplastic film body 300 to be molded under the tension of the constant force connector 400 before cooling, hardening and shaping, thus achieving a good bonding effect.

[0029] In this embodiment, the constant force connector 400 includes a base column 401, a movable column 402, and a constant force spring 403. The upper end of the movable column 402 is detachably connected to the thermoplastic film body 300, and the lower end of the base column 401 is detachably connected to the body positioning frame 100. The movable column 402 is slidably fitted into the base column 401 along the axial direction. The constant force spring 403 is connected to the base column 401 and the movable column 402, and the constant force spring 403 maintains a constant force to give the movable column 402 a downward tendency. Specifically, the upper end of the movable column 402 is provided with a first hook 404, which is hooked to the connection position 303. In this embodiment, the connection position 303 is a hanging hole to facilitate the hooking of the first hook 404. The lower end of the base column 401 is provided with a second hook 405, and the body positioning frame 100 is provided with a hanging piece. The second hook 405 can be hooked onto the hanging piece to achieve a detachable connection. In the specific configuration, a connecting shaft is installed at the upper part of the movable column 402. One end of the constant force spring 403 is wound around the connecting shaft, and the other end of the constant force spring 403 is fixedly connected to the lower part of the base column 401. After the hooks at both ends are connected, when the movable column 402 moves upward relative to the base column 401, the constant force spring 403 unfolds from the connecting shaft, generating a constant downward pulling force on the movable column 402. When the movable column 402 moves downward, the constant force spring 403 rewinds onto the connecting shaft, maintaining a constant pulling force. The constant force characteristic ensures that the thermoplastic film body 300 is always subjected to a constant downward pressure. Regardless of the patient's body size or slight displacement during treatment, the thermoplastic film body 300 can automatically adjust its height to maintain a close fit with the patient's body surface, avoiding the gap problem caused by changes in body shape or respiratory movements in traditional fixed thermoplastic film bodies.

[0030] Specifically, the pendant is configured as a first pendant 102 and a second pendant 103. The first pendant 102 is arc-shaped and is positioned between the head soft pouch 201 and the arm soft pouch 202, conforming to the arc of the human face. The second pendant 103 is located on the side of the back soft pouch 203. Both the first and second pendants 102 and 103 have several sets of mounting holes, allowing them to be installed in different holes to adjust the distance from the patient's body. This design is intended for use with thin or obese patients, ensuring the constant force connector 400 remains relatively vertical, thus allowing the thermoplastic film body 300 to better fit the patient's face and sides. The first and second pendants 102 have identical cross-sections. The upper part of the first pendant 102 cross-section has a hook for connecting with the lower part of the cross-section, which is straight and designed for connection with the positioning frame 100.

[0031] Example 2 Please see Figure 7 A method for radiotherapy localization of breast cancer based on human body adaptive shaping, using the breast cancer radiotherapy localization device of Example 1, includes the following steps: Step S1: The patient lies on the postural fixation frame 100 with both hands raised. Specifically, first, adjust the positioning frame 100 to a horizontal position and place it securely on the treatment bed. Assist the patient to slowly lie down on the positioning frame 100, instructing them to raise both hands overhead and extend their arms outwards as far as possible to ensure full chest exposure for subsequent radiotherapy irradiation. At this time, the patient's head is placed on the head soft pouch 201, the arms on the arm soft pouch 202, and the patient's back is pressed against the back soft pouch 203. Simultaneously, adjust the patient's head position so that it is on the longitudinal center line of the positioning frame 100. If irradiation of the supraclavicular lymph nodes is required, instruct the patient to tilt their head to the healthy side and raise their chin; if there is no need for supraclavicular lymph node irradiation, maintain the head in a neutral position. During this process, closely observe the patient's comfort and postural stability, and if necessary, place soft pads under the knees or ankles to alleviate fatigue from prolonged lying down.

[0032] Step S2: Use expanding foam to fill a soft capsule, and fill the gaps on both sides of the patient's head, back and arms through the soft capsule. After the expanding foam self-adapts and hardens, it forms placement slots for the patient's head, back and arms. Specifically, prepare the foaming material by accurately weighing component A (polyol component) and component B (isocyanate component) according to the specified ratio (usually 1:1 to 1:1.2). Pour both components into a dedicated mixing container and thoroughly mix using an electric stirrer or manual stirring rod for 10-30 seconds until the mixture is uniform in color and shows no obvious stratification. After mixing, immediately inject the mixed foaming material into the soft capsule through the sealable opening 204. The injection volume is estimated based on the soft capsule volume and the patient's body size, typically 30%-50% of the capsule volume, leaving room for foam expansion. The foam begins a chemical reaction under body temperature, gradually rising to approximately 40°C. At this point, the surface of the foam capsule is gently pressed to guide the foam material to flow and fill the gaps. The foam continues to expand, adaptively filling the gaps between the patient's body and the positioning frame 100, and filling the gaps between the arms and head / neck, forming placement slots for the patient's head, back, and arms, maintaining patient stability. The foam then completes its expansion and hardening process, typically taking 5-15 minutes. Once hardened, the foam capsule forms a rigid support structure that perfectly conforms to the contours of the patient's head, back, and arms—the placement slots. At this point, the patient's back, head, and arms are stably supported and restrained, laying the foundation for subsequent fixation of the thermoplastic film body 300.

[0033] Step S3: Fabricate the thermoplastic film body structure. Place the thermoplastic film body 300 in a constant temperature water tank for immersion. After taking it out, lay it flat on the patient's face and chest. The thermoplastic film body 300 adapts to the shape. Based on the patient's facial and chest contours, select a suitable thermoplastic film body 300. Check that the surface of the thermoplastic film body 300 is intact and that the tensile reinforcement lines are neat. Prepare a constant temperature water tank, setting and stabilizing the water temperature at 70℃±2℃. This temperature allows the thermoplastic material to soften sufficiently without thermal degradation. Place the thermoplastic film body 300 horizontally on the soaking rack in the constant temperature water tank, ensuring that the thermoplastic film body 300 is completely submerged in the hot water, avoiding direct contact with the bottom or side walls of the tank to prevent localized overheating. Soak for 4-5 minutes, gently shaking the thermoplastic film body 300 during this time to promote even heat transfer. After soaking, use a special clamp or wear heat-resistant gloves to quickly remove the softened thermoplastic film body 300 from the constant temperature water tank, gently shaking off any water droplets adhering to the surface. Lay the thermoplastic film body 300 flat on the patient's face and chest, operating quickly and smoothly to ensure that the thermoplastic film body 300 is positioned before cooling. During placement, first align the mouth and nose openings 204 of the face and neck membrane 301 with the patient's mouth and nose to ensure unobstructed breathing. Then, apply the face and neck membrane 301 to the face, jaw, and neck in sequence, and apply the pleural membrane 302 to the front and sides of the chest, ensuring the thermoplastic membrane body 300 fits tightly to the patient's body contours. The thermoplastic membrane body 300 gradually cools under the influence of the patient's body temperature and ambient temperature, allowing the material to harden again and maintain its shaped form. The cooling and setting time is usually 15-20 minutes. During this time, keep the patient's position stable to avoid movement that could deform the thermoplastic membrane body 300.

[0034] In step S4, the thermoplastic film body 300 is connected to the body positioning frame 100 through a constant force structure, and the thermoplastic film body 300 is pressed onto the patient.

[0035] During the cooling and shaping process of the thermoplastic film body 300 in step S3, the constant force connector 400 can be installed in this step. The thermoplastic film body 300 has several connection holes on its side. The first hook 404 at the upper end of the movable column 402 is hung on the connection hole, and the second hook 405 at the lower end of the bottom column 401 is hung on the connector. After connection, the constant force spring 403 activates, generating a constant downward pulling force on the thermoplastic film body 300, thus subjecting the thermoplastic film body 300 to continuous and stable downward pressure, pressing it onto the patient. Under this pressure, the thermoplastic film body 300 maintains a close fit with the patient's body surface (face, jaw, neck, chest), ensuring no gaps are formed. After shaping, it is checked and confirmed that the face, neck, and chest are effectively fixed, restricting chin position and head movement, and that the pleura 302 effectively covers the chest and inhibits respiratory movements.

[0036] All other embodiments obtained by those skilled in the art based on the embodiments in this disclosure without inventive effort are within the scope of protection of this disclosure.

[0037] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0039] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0040] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A breast cancer radiotherapy positioning device based on human body adaptive shaping, characterized in that, include: A body positioning frame (100) is used to fix the patient's lying position. A back fixation part (200) is mounted on the body positioning frame (100) and the back fixation part (200) can be adaptively shaped according to the patient's head and hands; Thermoplastic film body (300) is adaptable to the patient's face and chest and can be pressed onto the patient's face and chest; A constant force connector (400) is used to install the thermoplastic film body (300) on the body positioning frame (100).

2. The breast cancer radiotherapy positioning device based on human body adaptive shaping according to claim 1, characterized in that... The back fixing part (200) includes a foam soft bag, which is fixed on the body positioning frame (100) and has a sealable opening (204).

3. A breast cancer radiotherapy positioning device based on human body adaptive shaping according to claim 2, characterized in that... The foamed soft capsule includes one or more of a head soft capsule (201), an arm soft capsule (202), and a back soft capsule (203). The head soft capsule (201) can be used to support the patient's head, the arm soft capsule (202) can be used to support the patient's arm, and the back soft capsule (203) can be used to support the patient's back.

4. A breast cancer radiotherapy positioning device based on human body adaptive shaping according to claim 2, characterized in that... The body positioning frame (100) is provided with a fixing clamp assembly (101), and the side of the foam soft capsule is provided with a clamp (205), which is detachably connected to the fixing clamp assembly (101).

5. A breast cancer radiotherapy positioning device based on human body adaptive shaping according to claim 1, characterized in that... The thermoplastic film body (300) includes a face and neck film (301) and a pleural film (302). Both the face and neck film (301) and the pleural film (302) are made of thermoplastic material. Both sides of the face and neck film (301) and the pleural film (302) are provided with connection positions (303), which can be connected to the constant force connector (400).

6. A breast cancer radiotherapy positioning device based on human body adaptive shaping according to claim 5, characterized in that... The face and neck membrane (301) and the pleural membrane (302) are integrally formed.

7. A breast cancer radiotherapy positioning device based on human body adaptive shaping according to claim 5, characterized in that... The face and neck membrane (301) and the pleura (302) are each provided with a number of transverse tensile ribs and a number of longitudinal tensile ribs, which are arranged in a crisscross pattern.

8. A breast cancer radiotherapy positioning device based on human body adaptive shaping according to claim 1, characterized in that... The constant force connector (400) includes a base column (401), a movable column (402), and a constant force spring (403). The upper end of the movable column (402) is detachably connected to the thermoplastic film body (300), and the lower end of the base column (401) is detachably connected to the body positioning frame (100). The movable column (402) is slidably fitted into the base column (401) along the axial direction. The constant force spring (403) is connected to the base column (401) and the movable column (402). The constant force spring (403) maintains a constant force to make the movable column (402) tend to move downward.

9. A breast cancer radiotherapy positioning device based on human body adaptive shaping according to claim 8, characterized in that... The upper part of the movable column (402) is provided with a connecting shaft, one end of the constant force spring (403) is wound on the connecting shaft, and the other end of the constant force spring (403) is fixedly connected to the lower part of the bottom column (401).

10. A method for radiotherapy localization of breast cancer based on human adaptive shaping, characterized in that... The steps include the following: Step S1: The patient lies on the postural fixation frame (100) with both hands raised. Step S2: Use expanding foam to fill a soft capsule, and fill the gaps on both sides of the patient's head, back and arms through the soft capsule. After the expanding foam self-adapts and hardens, it forms placement slots for the patient's head, back and arms. Step S3: Make the thermoplastic film body structure, place the thermoplastic film body (300) in a constant temperature water tank for immersion, take it out and lay it flat on the patient's face and chest, the thermoplastic film body (300) adapts to the shape; In step S4, the thermoplastic film body (300) is connected to the body positioning frame (100) through a constant force structure, and the thermoplastic film body (300) is pressed onto the patient.

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