Automatic positioning system for tumor radiotherapy

Abstract

This invention relates to the field of radiotherapy for tumors. An automatic positioning device for tumor radiotherapy is disclosed, comprising an electric sliding platform and a radiotherapy apparatus. A concave frame is slidably connected to the inner wall of the electric sliding platform, and a lateral recumbent plate is fixedly connected to the top of the concave frame. A lateral hinge mechanism is provided on the concave frame, and to assist obese patients, the lateral hinge mechanism extends and supports the lateral recumbent plate in a hinge manner along both the left and right sides. A vertical hinge mechanism is provided on the lateral recumbent plate, and to assist tall patients, the vertical hinge mechanism extends and supports the lateral recumbent plate in a hinge manner along the bottom of the lateral recumbent plate, improving support strength and comfort. In this invention, by providing a push plate mechanism, the position of the patient's scapula is automatically calibrated when the lateral recumbent plate moves to the radiotherapy apparatus, allowing the patient to be positioned in the center of the lateral recumbent plate. This solves the problem of patients easily moving off-center in conventional radiotherapy, ensuring accurate irradiation of the tumor and reducing damage to normal tissue.

Description

Technical Field

[0001] The present invention relates to the technical field of tumor radiotherapy, and specifically, to an automatic positioning device for tumor radiotherapy.

Background Art

[0002] Tumor radiotherapy is one of the important means of cancer treatment, which uses high-energy radiation to accurately destroy tumor cells so as to achieve the treatment purpose.

[0003] A general tumor radiotherapy device usually comprises an electric sliding table and a radiotherapy device. First, the patient lies flat on the top of the electric sliding table, then the electric sliding table is activated to move the patient under the radiotherapy device, and then the radiotherapy device is used to perform radiotherapy on the patient below.

[0004] However, in actual use, it is difficult for the patient to ensure that he or she is at the center line position of the electric sliding table when lying on the top of the electric sliding table. As a result, after the electric sliding table moves the patient to the lower part of the radiotherapy device, due to the misalignment of the patient, the radiotherapy device cannot accurately aim at the treatment position of the tumor. When this deviation occurs, tumor cells cannot receive a sufficient amount of radiation, not only greatly reducing the treatment effect, but also causing unnecessary damage to the surrounding normal tissues, causing more complications, and possibly having a serious impact on the patient's recovery process.

Summary of the Invention

[0005] In consideration of the drawbacks of the prior art, the present invention provides an automatic positioning device for tumor radiotherapy, which solves the problem that when a patient lies on the top of an electric sliding table during tumor radiotherapy, it is easy to deviate from the center line, and as a result, the radiotherapy device cannot accurately aim at the tumor.

[0006] To achieve the above objective, the present invention is realized by the following technical means: an automatic positioning device for radiotherapy of tumors, comprising an electric sliding base and a radiotherapy device, wherein a concave frame is slidably connected to the inner wall of the electric sliding base, and a reclining plate is fixedly connected to the top of the concave frame. A lateral hinge plate mechanism is provided on the aforementioned concave frame, and the lateral hinge plate mechanism extends along both the left and right sides of the lateral plate in a hinge manner to provide support. A vertical hinge plate mechanism is provided on the aforementioned horizontal plate, and the vertical hinge plate mechanism extends and supports along the bottom of the horizontal plate in a hinge manner. A push plate mechanism is provided at the bottom of the electric sliding platform, and as the lateral recumbent plate moves along the electric sliding platform toward the radiation therapy device, the push plate mechanism automatically pushes the patient's scapula inward to calibrate its position and position the patient in the center of the lateral recumbent plate.

[0007] Preferably, the lateral hinge plate mechanism includes a threaded rod A, the top of which is rotatably connected to the bottom of the lateral plate, the outer wall of the middle portion of which is rotatably connected through the inner wall of a concave frame, a movable block A is screw-connected to the outer wall of which which which is hinge-connected to the outer wall of which which which is hinge-connected to the outer wall of which which which is hinge-connected to the outer wall of which which is hinge-connected to the outer wall of which which is hinge-connected to the inner wall of the lateral plate.

[0008] Preferably, the vertical hinge plate mechanism includes a threaded rod B, the top of which is rotatably connected to the bottom of the transverse plate, a movable block B is screw-connected to the outer wall of the threaded rod B, a vertical connecting rod is hinge-connected to the outer wall of the movable block B, a vertical plate is hinge-connected to the top of the vertical connecting rod, and the inner wall of the vertical plate is hinge-connected to the inner wall of the transverse plate by a hinge.

[0009] Preferably, a sprocket A is fixedly connected to the bottom of the threaded rod B, a sleeve is rotatably connected to the bottom of the concave frame, a sprocket B is fixedly connected to the outer wall of the middle portion of the sleeve, and the outer wall of the sprocket A is power-driven by a chain to the outer wall of the sprocket B.

[0010] Preferably, a locking slot is formed at the bottom of the sleeve, an inner rod is fixedly connected to the bottom of the threaded rod A, a sliding block is fixedly connected to the outer wall of the inner rod, an outer rod is slidably connected to the outer wall of the inner rod, a rectangular slot is formed in the inner wall of the outer rod, and the inner wall of the rectangular slot is slidably connected to the outer wall of the sliding block.

[0011] Preferably, the bottom of the inner rod is fixedly connected to one end of the spring, the other end of the spring is fixedly connected to the inner wall of the outer rod, the outer wall of the outer rod is fixedly connected to a locking block, and the outer wall of the locking block is inserted and connected to the inner wall of the locking slot.

[0012] Preferably, the push plate mechanism includes a sliding track, the top of which is fixedly connected to the bottom of the electric sliding base, and a rectangular shell portion is slidably connected to the inner wall of which is which.

[0013] Preferably, a movable frame is slidably connected to the outer wall of the rectangular shell, and the top of the movable frame is fixedly connected to the outer wall of the movable block A.

[0014] Preferably, an arc-shaped push plate is slidably connected to the inner wall of the horizontal plate, a connecting rod is hinged to the bottom of the arc-shaped push plate, a guide rod is fixedly connected to the bottom of the connecting rod, a sphere is fixedly connected to the bottom of the guide rod, the outer wall of the guide rod is slidably connected through the top of the rectangular shell, and the arc-shaped sliding rail is fixedly connected to the inner wall of the rectangular shell.

[0015] Preferably, the inner wall of the arc-shaped sliding rail is slidably connected to the outer wall of the sphere, and the outer wall of the guide rod is slidably connected through the top of the arc-shaped sliding rail.

[0016] Operating principle: During radiation therapy, the patient lies on a lateral recumbent plate, and an electric sliding platform is activated to move a concave frame horizontally toward the radiation therapy device. Guide rods and connecting rods move two sets of arc-shaped pressing plates toward the center, compressing the patient's scapula, assisting in adjusting the patient's position, and ensuring precise positioning.

[0017] Before radiation therapy, the lateral recumbent bed can be adjusted to suit the patient's body shape to improve comfort. In the case of obese patients, the outer rod is rotated to drive the inner rod, which rotates the threaded rod A, moves the movable block A upward, and the lateral support plates on both sides of the lateral support plate are supported by the lateral connecting rod, providing extended support.

[0018] In the case of a tall and obese patient, first the outer rod is pushed upward to insert and connect the locking block into the locking slot, then the outer rod is rotated to rotate the inner rod and sleeve, and the sprocket A, sprocket B, and chain are used to transmit power, rotating threaded rods A and B simultaneously to increase the efficiency of the expansion support. At the same time, threaded rod B rotates to move the movable block B upward, and the vertical connecting rod lifts the vertical plate to support the patient's legs.

[0019] When movable block A moves upward, it indicates that the patient is overweight. At this time, movable block A drives the movable frame to raise the rectangular shell, change the height of the arc-shaped sliding rail, move the sphere upward, and drive the arc-shaped push plate to extend outward. This allows for synchronized adjustment of the calibration position of the arc-shaped push plate when achieving expanded support of threaded rod A, improving the convenience of the device.

[0020] This invention provides an automatic positioning device for tumor radiotherapy. It offers the following beneficial effects:

[0021] 1. In this invention, by providing a push plate mechanism, the position of the patient's scapula is automatically calibrated when the lateral recumbent plate moves to the radiation therapy device, and the patient can be positioned in the center of the lateral recumbent plate. This solves the problem in conventional radiation therapy where patients tend to move off the center line, ensuring accurate irradiation of the tumor, reducing damage to normal tissue, improving treatment outcomes, and reducing complications.

[0022] 2. The present invention includes a horizontal hinge plate mechanism and a vertical hinge plate mechanism, and during use, the horizontal plate and the vertical plate of the horizontal lying plate can be deployed according to the body type of the patient. Thereby, the effect of extended support can be obtained, and it can be adapted to the treatment support for patients with different body types.

[0023] 3. The present invention adopts the design of an outer rod, a locking slot, and a locking block. When it is necessary to simultaneously open and support the horizontal plate and the vertical plate, the outer rod and the sleeve are inserted and connected and fixed in a pushing and rotating manner, and by simultaneously rotating and driving the screw rod A and the screw rod B, it is no longer necessary for the employee to separately adjust the screw rod B after adjusting the screw rod A.

[0024] 4. In the present invention, when the moving block A moves upward due to the obesity of the patient, the moving frame and the rectangular shell part are driven to change the height of the arc-shaped sliding rail, and the moving frame is set to deploy the arc-shaped pressing plate outward. Thereby, synchronous adjustment of extended support and calibration position is realized, reducing multiple manual adjustments, improving the convenience of operation, and saving the preparation time for radiotherapy.

Brief Description of the Drawings

[0025] [Figure 1] It is a perspective view according to the present invention. [Figure 2] It is a schematic diagram of the structure after the horizontal plate and the vertical plate according to the present invention are folded. [Figure 3] It is a schematic diagram of the cross-sectional structure of the concave frame according to the present invention. [Figure 4] It is a schematic diagram of the structure of the vertical hinge plate mechanism according to the present invention. [Figure 5] It is a schematic diagram of the structure of the horizontal hinge plate mechanism according to the present invention. [Figure 6] It is a schematic diagram of the structure of the pressing plate mechanism according to the present invention. [Figure 7] It is a schematic diagram of the cross-sectional structure of the rectangular shell part according to the present invention. [Figure 8] It is a schematic diagram of the structure of the arc-shaped pressing plate according to the present invention.

Modes for Carrying Out the Invention

[0026] The technical proposals in embodiments of the present invention are described below clearly and completely with reference to the accompanying drawings of the present invention. Obviously, the embodiments described are only a selection of embodiments of the present invention, not all embodiments. All other embodiments that can be obtained by those skilled in the art without creative work based on embodiments of the present invention are included within the scope of protection of the present invention.

[0027] Refer to Figures 1 to 8. An embodiment of the present invention provides an automatic positioning device for tumor radiotherapy, comprising an electric sliding platform 1 and a radiotherapy device 2. The bottoms of the electric sliding platform 1 and the radiotherapy device 2 are connected and fixed to the ground with bolts to ensure stability during use. A concave frame 3 is slidably connected to the inner wall of the electric sliding platform 1. By activating the electric sliding platform 1, the electric sliding platform 1 drives the concave frame 3 to move laterally, moving the patient to the area below the radiotherapy device 2 for treatment. A lateral recumbent plate 7 for supporting the patient is fixedly connected to the top of the concave frame 3. A lateral hinge plate mechanism 4 is provided on the concave frame 3.

[0028] When a tumor patient requires radiation therapy, the patient lies on the lateral recumbent plate 7. When the electric sliding platform 1 is activated, the electric sliding platform 1 drives the concave frame 3 to move laterally, moving the concave frame 3 toward the radiation therapy device 2. Once the concave frame 3 moves the lateral recumbent plate 7 beneath the radiation therapy device 2, the radiation therapy device 2 is activated and radiation therapy is administered to the tumor patient.

[0029] The lateral hinge plate mechanism 4 includes a threaded rod A401, the top of which is rotatably connected to the bottom of the lateral plate 7, so that the lateral plate 7 supports the threaded rod A401. The outer wall of the middle portion of the threaded rod A401 is rotatably connected through the inner wall of the concave frame 3, so that the threaded rod A401 rotates along the inner wall of the concave frame 3.

[0030] A movable block A402 is screw-connected to the outer wall of a threaded rod A401, and by rotating the threaded rod A401, the movable block A402 is moved vertically, changing its vertical position. A horizontal connecting rod 404 is hinge-connected to the outer wall of the movable block A402, and the horizontal plate 405 is flipped over and unfolded by the horizontal connecting rod 404 while the movable block A402 is moving. The horizontal plate 405 is hinge-connected to the outer wall of the horizontal connecting rod 404, and the inner wall of the horizontal plate 405 and the inner wall of the horizontal reclining plate 7 are hinge-connected to each other via the hinge, which enables the horizontal plate 405 to be flipped over and stored along the horizontal reclining plate 7, or to be flipped over and unfolded.

[0031] Because the existing lateral decubitus plate 7 has a fixed size during use, it cannot be expanded or adjusted when facing patients with different body types, affecting the adaptability and comfort of the lateral decubitus plate 7. The above device can adjust the lateral decubitus plate 7 to the patient's body type before radiation therapy, thereby improving patient comfort. Specifically, it is as follows: In the case of an obese patient, the lateral hinge plate mechanism 4 is adjusted, and a medical staff member rotates the outer rod 407, which drives the inner rod 411 to rotate, which drives the threaded rod A401 to rotate, which drives the movable block A402 upward to move, and the two sets of lateral connecting rods 404 support the lateral support plates located on both sides of the lateral recumbent plate 7 upward and open, thereby providing an effect of expanding support for the patient.

[0032] A vertical hinge plate mechanism 5 is provided on the horizontal plate 7. The vertical hinge plate mechanism 5 includes a threaded rod B504, the top of which is rotatably connected to the bottom of the horizontal plate 7, and the bottom of the horizontal plate 7 provides support to the threaded rod B504. A movable block B505 is screw-connected to the outer wall of the threaded rod B504, and the vertical position of the movable block B505 is changed by moving the movable block B505 vertically while the threaded rod B504 is rotated. A vertical connecting rod 506 is hinge-connected to the outer wall of the movable block B505, and the vertical plate 507 is inverted by the vertical connecting rod 506 while the movable block B505 is moved. A vertical plate 507 is hinged to the top of a vertical connecting rod 506, and the inner wall of the vertical plate 507 and the inner wall of the horizontal plate 7 are hinged to each other via the hinge, enabling the vertical plate 507 to be flipped over along the horizontal plate 7 for storage or flipped over for deployment.

[0033] The bottom of the threaded rod B504 is fixedly connected to the sprocket A502, and the sprocket A502 drives the threaded rod B504 to rotate. The sleeve 406 is rotatably connected to the bottom of the concave frame 3, and the concave frame 3 provides support for the sleeve 406. The outer wall of the middle part of the sleeve 406 is fixedly connected to the sprocket B503, and the sleeve 406 is driven and rotated simultaneously when the sprocket B503 rotates. The outer wall of the sprocket A502 is transmitted to the outer wall of the sprocket B503 via the chain 501, so when the sprocket A502 rotates, the sprocket B503 is also driven and rotated simultaneously via the chain 501, providing a transmission effect.

[0034] A locking slot is provided at the bottom of the sleeve 406, facilitating connection between the bottom of the sleeve 406 and the locking block 408 installed at the top of the outer rod 407. The inner rod 411 is fixedly connected to the bottom of the threaded rod A401, and the threaded rod A401 is driven to rotate while the inner rod 411 is rotating. A sliding block 410 is fixedly connected to the outer wall of the inner rod 411, and the outer rod 407 is slidably connected to the outer wall of the inner rod 411, allowing the outer rod 407 to move vertically along the outer wall of the inner rod 411. A rectangular slot 403 is formed in the inner wall of the outer rod 407, and the design of the sliding block 410 and the rectangular slot 403 allows the outer rod 407 to move along the outer wall of the inner rod 411, simultaneously driving and rotating the inner rod 411 while the outer rod 407 is rotating. The inner wall of the rectangular slot 403 and the outer wall of the sliding block 410 are slidably connected.

[0035] The bottom of the inner rod 411 is fixedly connected to one end of the spring 409, and the other end of the spring 409 is fixedly connected to the inner wall of the outer rod 407. The force of the spring 409 drives the outer rod 407 downward, maintaining the outer rod 407 away from the sleeve 406. A locking block 408 is fixedly connected to the outer wall of the outer rod 407, and the outer wall of the locking block 408 is inserted and connected to the inner wall of the locking slot. This insert connection method allows the outer rod 407 to drive and rotate the sleeve 406.

[0036] In the case of a tall and relatively obese patient, the medical staff first use the vertical hinge plate mechanism 5 to push the outer rod 407 upward, inserting the locking block 408 located at the top of the outer rod 407 into the locking slot at the bottom of the sleeve 406 to connect them. Then, when the outer rod 407 is rotated, the outer rod 407 drives the inner rod 411 to rotate, and simultaneously drives the sleeve 406 to rotate. Through the transmission effect of sprockets A502, B503, and chain 501, the sleeve 406 rotates threaded rods A401 and B504 simultaneously, thereby improving the efficiency of deployment and expansion support. Simultaneously, the rotation of threaded rod B504 moves the movable block B505 upward, driving the vertical plate 507 via the vertical connecting rod 506 to invert it upward, providing an expansion support effect to the patient's leg.

[0037] A push plate mechanism 6 is provided at the bottom of the electric sliding base 1. The push plate mechanism 6 includes a sliding rail 605. The top of the sliding rail 605 is fixedly connected to the bottom of the electric sliding base 1, so that the electric sliding base 1 provides support to the sliding rail 605. A rectangular shell portion 601 is slidably connected to the inner wall of the sliding rail 605, so that the rectangular shell portion 601 can move vertically along the inner wall of the sliding rail 605. A movable frame 602 is slidably connected to the outer wall of the rectangular shell portion 601, so that the inner wall of the movable frame 602 can move horizontally along the outer wall of the rectangular shell portion 601. The top of the movable frame 602 is fixedly connected to the outer wall of the movable block A402, so that while the movable block A402 moves vertically, the movable frame 602 is driven to move vertically at the same time, and the movable frame 602 drives the rectangular shell portion 601 set on its inner wall to move upward at the same time.

[0038] If the patient is lying on the top of the lateral recumbent plate 7, they cannot accurately confirm that they are positioned on the center line of the lateral recumbent plate 7, which affects the subsequent positioning and effectiveness of the radiation therapy device 2. After the patient lies on the lateral recumbent plate 7, the medical staff first instructs the patient to place the shoulder area on their back in the grooves at the top of the lateral recumbent plate 7. At this time, when the motorized sliding platform 1 is activated, the arc-shaped push plate 608 positioned on the inner wall of the concave frame 3 drives the bottom sphere 606 to move along the arc-shaped sliding rail 604. The sphere 606 pulls the top guide rod 603 downward, and as the guide rod 603 moves downward, the connecting rod 607 drives the two sets of arc-shaped push plates 608 to move towards the center, and the arc-shaped push plates 608 compress and press against the patient's scapula, helping the patient adjust the position of the lateral recumbent plate 7 and achieve the goal of precise positioning.

[0039] An arc-shaped push plate is slidably connected to the inner wall of the horizontal plate 7, ensuring stability when the arc-shaped push plate 608 moves laterally. A connecting rod 607 is hinged to the bottom of the arc-shaped push plate 608, and a guide rod 603 is fixedly connected to the bottom of the connecting rod 607. As the guide rod 603 moves vertically, the arc-shaped push plate 608 is driven to move laterally via the connecting rod 607. A sphere 606 is fixedly connected to the bottom of the guide rod 603, and the sphere 606 moves the guide rod 603 vertically, changing its vertical position. The outer wall of the guide rod 603 penetrates the top of the rectangular shell portion 601 and is slidably connected. An arc-shaped sliding rail 604 is fixedly connected to the inner wall of the rectangular shell portion 601, so the rectangular shell portion 601 provides a support effect to the arc-shaped sliding rail 604. Since the inner wall of the arc-shaped sliding rail 604 is slidably connected to the outer wall of the sphere 606, the sphere 606 is compressed by the arc-shaped sliding rail 604 as it moves, gradually moving downward, and the sphere 606 drives the guide rod 603 to move downward simultaneously. The outer wall of the guide rod 603 penetrates the top of the arc-shaped sliding rail 604 and is slidably connected to it.

[0040] At the same time, considering that the lateral hinge plate mechanism 4 is adjusted to unfold outwards, it means that the patient is overweight, and the calibration position of the arc-shaped push plate 608 needs to be adjusted. When the movable block A402 moves upward, the movable frame 602 is also driven by the movable block A402 and moves upward at the same time, and the movable frame 602 drives the rectangular shell 601 installed on the inner wall upward and moves it, changing the height of the rectangular shell 601, and changing the height of the arc sliding rail 604 installed on the inner wall of the rectangular shell 601, the sphere 606 moves upward at the same time, driving the arc-shaped push plate 608 to unfold outwards, the threaded rod A401 expands and supports, and at the same time the calibration position of the two sets of arc-shaped push plates 608 is adjusted, further improving the convenience of the device.

[0041] While embodiments of the present invention are shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents. [Explanation of symbols]

[0042] 1. Electric sliding platform 2 Radiation therapy equipment 3. Concave frame 4. Horizontal hinge plate mechanism 401 Threaded rod A 402 Moving Block A 403 rectangular slots 404 Horizontal connecting rod 405 Horizontal board 406 Sleeves 407 Outer rod 408 Locking block 409 spring 410 Sliding Block 411 Inner rod 5. Vertical hinge plate mechanism 501 Chain 502 Sprocket A 503 Sprocket B 504 Threaded rod B 505 Moving Block B 506 Vertical connecting rod 507 Vertical board 6. Push plate mechanism 601 Rectangular shell 602 Moving Frames 603 Guide rod 604 Arc-shaped sliding rail 605 Sliding rail 606 spheres 607 Connecting rod 608 Arc-shaped press plate 7. Lying board.

Claims

1. An automatic positioning device for tumor radiotherapy comprises an electric sliding table (1) and a radiotherapy device (2), wherein a concave frame (3) is slidably connected to the inner wall of the electric sliding table (1), and a reclining plate (7) is fixedly connected to the top of the concave frame (3). A lateral hinge plate mechanism (4) is provided on the concave frame (3), and the lateral hinge plate mechanism (4) supports the lateral reclining plate (7) by extending it along both the left and right sides of the lateral reclining plate (7) in a hinge manner. A vertical hinge plate mechanism (5) is provided on the aforementioned reclining plate (7), and the vertical hinge plate mechanism (5) supports the reclining plate (7) by unfolding it along the bottom of the reclining plate (7) in a hinge manner. An automatic positioning device for tumor radiotherapy, characterized in that a push plate mechanism (6) is provided at the bottom of the electric sliding platform (1), and when the lateral recumbent plate (7) moves along the electric sliding platform (1) toward the radiotherapy device (2), the push plate mechanism (6) automatically pushes the patient's scapula inward to calibrate its position and position the patient in the center of the lateral recumbent plate (7).

2. The automatic positioning device for tumor radiotherapy according to claim 1, characterized in that the lateral hinge plate mechanism (4) comprises a threaded rod A (401), the top of the threaded rod A (401) is rotatably connected to the bottom of the lateral plate (7), the outer wall of the middle part of the threaded rod A (401) is rotatably connected through the inner wall of the concave frame (3), a movable block A (402) is screw-connected to the outer wall of the threaded rod A (401), a lateral connecting rod (404) is hinge-connected to the outer wall of the movable block A (402), a lateral plate (405) is hinge-connected to the outer wall of the lateral connecting rod (404), and the inner wall of the lateral plate (405) is hinge-connected to the inner wall of the lateral plate (7) by a hinge.

3. The automatic positioning device for tumor radiotherapy according to claim 1, characterized in that the vertical hinge plate mechanism (5) comprises a threaded rod B (504), the top of the threaded rod B (504) is rotatably connected to the bottom of the lateral plate (7), a movable block B (505) is screw-connected to the outer wall of the threaded rod B (504), a vertical connecting rod (506) is hinge-connected to the outer wall of the movable block B (505), a vertical plate (507) is hinge-connected to the top of the vertical connecting rod (506), and the inner wall of the vertical plate (507) is hinge-connected to the inner wall of the lateral plate (7) by a hinge.

4. The automatic positioning device for tumor radiotherapy according to claim 3, characterized in that a sprocket A (502) is fixedly connected to the bottom of the threaded rod B (504), a sleeve (406) is rotatably connected to the bottom of the concave frame (3), a sprocket B (503) is fixedly connected to the outer wall of the middle part of the sleeve (406), and the outer wall of the sprocket A (502) is transmitted to the outer wall of the sprocket B (503) by a chain (501).

5. A locking slot is formed at the bottom of the sleeve (406), an inner rod (411) is fixedly connected to the bottom of the threaded rod A (401), a sliding block (410) is fixedly connected to the outer wall of the inner rod (411), an outer rod (407) is slidably connected to the outer wall of the inner rod (411), a rectangular slot (403) is formed in the inner wall of the outer rod (407), and the inner wall of the rectangular slot (403) is slidably connected to the outer wall of the sliding block (410), The automatic positioning device for tumor radiotherapy according to claim 4, characterized in that the bottom of the inner rod (411) is fixedly connected to one end of the spring (409), the other end of the spring (409) is fixedly connected to the inner wall of the outer rod (407), the outer wall of the outer rod (407) is fixedly connected to the locking block (408), and the outer wall of the locking block (408) is inserted and connected to the inner wall of the locking slot.

6. The automatic positioning device for tumor radiotherapy according to claim 1, characterized in that the push plate mechanism (6) includes a sliding rail (605), the top of the sliding rail (605) is fixedly connected to the bottom of the electric sliding base (1), and a rectangular frame portion (601) is slidably connected to the inner wall of the sliding rail (605).

7. The automatic positioning device for tumor radiotherapy according to claim 6, characterized in that a movable frame (602) is slidably connected to the outer wall of the rectangular frame portion (601), and the top of the movable frame (602) is fixedly connected to the outer wall of the movable block A (402).

8. The automatic positioning device for tumor radiotherapy according to claim 1, characterized in that an arc-shaped push plate (608) is slidably connected to the inner wall of the lateral plate (7), a connecting rod (607) is hinged to the bottom of the arc-shaped push plate (608), a guide rod (603) is fixedly connected to the bottom of the connecting rod (607), a sphere (606) is fixedly connected to the bottom of the guide rod (603), the outer wall of the guide rod (603) is slidably connected through the top of the rectangular frame portion (601), and an arc-shaped sliding rail (604) is fixedly connected to the inner wall of the rectangular frame portion (601).

9. The automatic positioning device for tumor radiotherapy according to claim 8, characterized in that the inner wall of the arc-shaped sliding rail (604) is slidably connected to the outer wall of the sphere (606), and the outer wall of the guide rod (603) penetrates the top of the arc-shaped sliding rail (604) and is slidably connected to it.

Images