A positioning error correction auxiliary device for head radiotherapy

Abstract

The application discloses a positioning error correction auxiliary device for head radiotherapy and belongs to the technical field of head radiotherapy. The device comprises a mask frame, an arc-shaped plate one and an arc-shaped plate two are fixedly installed on one side of the mask frame from top to bottom, lead cloth is pasted on the bottom surface of the arc-shaped plate two, and corresponding openings are uniformly formed in the arc-shaped plate two and the lead cloth. The device further comprises a correction assembly arranged on the arc-shaped plate one and used for providing position indication during target frame movement to assist an operator in quickly positioning the target frame above a target opening, and an adjusting assembly arranged between the target frame and the lead cloth. The device can realize quick and accurate positioning of the target frame according to the opening of the corresponding affected part of a patient, facilitate removal and resetting of lead patches in the corresponding opening, replace the complicated operation of manually removing or filling the lead patches, greatly simplify the operation process, and improve radiotherapy positioning efficiency and accuracy.

Description

Technical Field

[0001] This invention relates to the field of head radiotherapy technology, and more specifically, to an auxiliary device for correcting positioning errors in head radiotherapy. Background Technology

[0002] In radiotherapy for head tumors, accurate positioning and radiation field alignment are crucial prerequisites for ensuring target dose coverage and protecting surrounding normal tissues. In existing radiotherapy positioning devices, some schemes use lead cloth attached to the lower surface of a transparent arched plate. Multiple openings are evenly distributed on the lead cloth, and lead patches can be selectively installed in each opening. By removing patches at specific locations, a radiation channel is formed, thereby achieving radiation field conformal mapping.

[0003] However, in actual clinical practice, since the tumor target area varies from patient to patient, the lead patch in the corresponding opening must be manually removed or filled before each treatment, depending on the target area location. This operation is cumbersome and time-consuming, and it is easy to cause target area dose deviation or accidental obstruction by normal tissue due to incorrect patch installation or omission, which seriously affects the efficiency and accuracy of radiotherapy positioning. At the same time, when the target frame of the existing device moves on the transparent arch plate, it relies solely on the operator's visual judgment to determine whether it is aligned with the lead cloth opening below. It lacks an intuitive quantitative alignment indicator structure, making it difficult to quickly and accurately determine the relative position between the target frame and the target opening. The above two defects are superimposed, which seriously affects the efficiency and accuracy of radiotherapy positioning. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention aims to provide an auxiliary device for positioning error correction in head radiotherapy, which can achieve rapid and accurate positioning of the target frame according to the opening of the corresponding lesion of the patient, and at the same time facilitate the removal and repositioning of lead patches in the corresponding opening. This replaces the cumbersome operation of manually removing or filling lead patches, greatly simplifies the operation process, and improves the efficiency and accuracy of radiotherapy positioning.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] An auxiliary device for correcting positioning errors in head radiotherapy includes a mask frame. An arched plate 1 and an arched plate 2 are fixedly installed on one side of the mask frame from top to bottom. Lead cloth is pasted on the bottom surface of the arched plate 2. The arched plate 2 and the lead cloth have corresponding openings evenly distributed on them. Also includes: A correction component, which is disposed on the arched plate, is used to provide position indication during the movement of the target frame, so as to assist the operator in quickly positioning the target frame directly above the target opening; An adjustment component is disposed between the target frame and the lead cloth. After the target frame is positioned, it is used to drive the lead block in the target opening to move out of the opening in response to an external triggering action, so as to form an unobstructed ray channel.

[0007] Furthermore, the adjusting assembly includes a fixed cylinder, a movable rod inserted inside the fixed cylinder, a magnet fixedly installed at the bottom end of the movable rod, slots evenly distributed on the top surface of the arched plate, each set of slots communicating with the adjacent opening, an annular ring inside the opening, a lead block installed inside the annular ring, a fixed column fixedly installed in the slot, a sleeve rod sleeved on the outside of the fixed column, the sleeve rod inserted into the slot, the sleeve rod fixedly connected to the annular ring, a ball rolled on the wall of the fixed column, a groove of a different shape adapted to the ball opened on the inner wall of the sleeve rod, and a magnet fixedly installed at the top end of the sleeve rod. The first magnet and the second magnet are separated by an arched plate made of non-ferromagnetic material, forming a cross-medium magnetic coupling transmission between them, which is used to drive the lead block to move out of the opening when the movable rod is pressed.

[0008] Furthermore, the correction assembly includes two arc-shaped groove plates fixedly installed on the top of the arched plate, an adjusting rod slidably installed between the two arc-shaped groove plates, elastic blocks slidably installed at both ends of the adjusting rod, ball bearings rollingly installed on opposite sides of the two elastic blocks, grooves adapted to the ball bearings on opposite sides of the two arc-shaped groove plates, an adjusting frame slidably installed on the rod wall of the adjusting rod, a T-shaped plate slidably installed inside the adjusting frame, an elastic block 2 installed at the bottom end of the T-shaped plate, ball bearing 2 rollingly installed at the bottom end of the elastic block 2, and grooves adapted to the ball bearing 2 evenly opened on the top of the adjusting rod; The fixed cylinder is fixedly installed on one side of the adjusting frame, and the target frame is fixedly installed on one side of the fixed cylinder. The engagement of the first ball and the first groove, and the engagement of the second ball and the second groove together constitute a position indication structure. When the first ball and the second ball are respectively engaged in the corresponding first and second grooves, the target frame is aligned with the target opening below it, and provides the operator with positioning feedback through the tactile feedback and sound generated during engagement.

[0009] Furthermore, a circular plate is rotatably mounted on the top wall of the inner cavity of the sleeve rod, and a spring is fixedly mounted between the circular plate and the top of the fixed column, which is used to drive the sleeve rod to reset after the magnetic attraction disappears, so that the lead block falls back into the opening.

[0010] Furthermore, a rotating plate is rotatably mounted on the top of the inner cavity of the fixed cylinder, the movable rod passes through the rotating plate and rotates with it, and a spring is fixedly installed between the rotating plate and the bottom wall of the inner cavity of the fixed cylinder to drive the movable rod to return upward after the pressing pressure is released; Insert plates are fixedly installed on both sides of the movable rod. A ball is rolled on the top of the insert plate. A slot adapted to the ball is opened at the bottom of the fixed cylinder. When the movable rod is pressed to the lowest position and rotated, the ball is inserted into the slot, locking the movable rod in the pressed state.

[0011] Furthermore, a connecting plate is provided between the movable rod and the T-shaped plate, and the two ends of the connecting plate are rotatably connected to the top ends of the movable rod and the T-shaped plate, respectively.

[0012] Furthermore, a sealing ring is fixedly installed on the inner wall of the bottom end of the sleeve rod, and the sealing ring slides and seals with the outer wall of the fixed column. The cavity between the sleeve rod and the fixed column is filled with lubricating oil.

[0013] Furthermore, the magnetic attraction between magnet one and magnet two is greater than the elastic force of spring one and less than the elastic force of spring two, so that the sleeve rod can overcome the resistance of spring one and complete the lifting action under the action of magnetic attraction. At the same time, after the pressing pressure is released, spring two can overcome the magnetic attraction and drive the movable rod to return to its original position.

[0014] Furthermore, the bottom end of the lead block protrudes radially outward to form a flange, the bottom surface of the flange is flush with the bottom surface of the annular ring, and the outer diameter of the flange is consistent with the outer diameter of the annular ring, so that the lead block and the lead cloth together form a flat radiation shielding surface.

[0015] Furthermore, both the first arched plate and the second arched plate are made of transparent material so that the operator can observe the position and state of the lead block through the first arched plate and the second arched plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention provides the operator with a clear sense of jolt and sound feedback during the movement of the target frame in the lateral arc and longitudinal directions by engaging the first ball and the first groove, and engaging the second ball and the second groove. This allows the operator to obtain clear feedback on the positioning without relying on visual inspection, and achieves rapid and accurate positioning of the target frame on the surface of the arched plate. This effectively solves the problem that the existing device lacks an intuitive and quantifiable alignment indicator structure between the target frame and the lead cloth opening, and the positioning is difficult due to relying solely on visual inspection.

[0017] (2) The present invention uses cross-medium magnetic coupling transmission between magnet one and magnet two. After the target frame is positioned, only the movable rod needs to be pressed to drive the sleeve rod to move the lead block out of the ring and the opening. Under the guidance of the vertical section and arc section of the irregular groove, it completes a 180° deflection, so that the target opening is fully exposed to form an unobstructed radiation channel. This replaces the cumbersome operation of manually removing or filling lead patches, avoids target area dose deviation or accidental obstruction of normal tissue caused by incorrect patch installation or removal, greatly simplifies the operation process, and improves the efficiency and accuracy of radiotherapy positioning.

[0018] (3) The present invention connects the movable rod and the T-shaped plate through the connecting plate. When the movable rod is pressed, the connecting plate drives the T-shaped plate to move downward, so that the second ball is further pressed into the groove two that is currently inserted, thereby realizing the synchronous locking and fixing of the adjustment frame on the adjustment rod. This effectively prevents the target frame from shifting due to vibration or accidental contact during the treatment process, and further ensures the long-term stability and repeatability of the radiotherapy positioning. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side sectional view of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of the structure of section A in the middle; Figure 4 For the present invention Figure 2 Partial sectional view of the structure; Figure 5 This is a cross-sectional view of the arc-shaped groove plate of the present invention; Figure 6 This is a bottom view of the fixing cylinder of the present invention; Figure 7 This is a schematic diagram of the irregular groove structure of the present invention; Figure 8 This is an exploded structural diagram of the present invention; Figure 9 This is a schematic diagram of the overall side structure of the present invention.

[0020] Explanation of the labels in the diagram: 1. Mask frame; 101. Arched plate one; 102. Arched plate two; 103. Lead cloth; 104. Opening; 105. Ring; 106. Lead block; 107. Target frame; 2. Arc-shaped groove plate; 201. Adjusting rod; 202. Elastic block one; 203. Ball bearing one; 204. Groove one; 205. Adjusting frame; 206. T-shaped plate; 207. Elastic block two; 208. Ball bearing two; 209. Groove two; 3. Fixed cylinder; 301. Movable rod; 302. Magnet one; 303. Slot; 304. Fixed column; 305. Sleeve rod; 306. Rolling ball; 307. Irregular groove; 308. Magnet two; 309. Circular plate; 310. Spring one; 311. Insert plate; 312. Circular ball; 313. Slot; 314. Rotating plate; 315. Spring two; 316. Connecting plate; 4. Sealing ring. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1 to 9 A positioning error correction auxiliary device for head radiotherapy includes a mask frame 1. An arched plate 101 and an arched plate 102 are fixedly installed on one side of the mask frame 1 from top to bottom. A lead cloth 103 is pasted on the bottom surface of the arched plate 102. Corresponding openings 104 are evenly opened on the arched plate 102 and the lead cloth 103. Also includes: The correction component is set on the arched plate 101 and is used to provide position indication during the movement of the target frame 107 to assist the operator in quickly positioning the target frame 107 directly above the target opening 104. An adjustment component is disposed between the target frame 107 and the lead cloth 103. After the target frame 107 is positioned, it is used to drive the lead block 106 in the target opening 104 to move out of the opening 104 in response to an external triggering action, so as to form an unobstructed ray channel.

[0023] The adjustment assembly includes a fixed cylinder 3, a movable rod 301 inserted inside the fixed cylinder 3, a magnet 302 fixedly installed at the bottom end of the movable rod 301, slots 303 evenly opened on the top surface of the arched plate 102, each set of slots 303 being connected to an adjacent opening 104, an annular ring 105 being provided inside the opening 104, a lead block 106 being installed inside the annular ring 105, a fixed post 304 being fixedly installed inside the slot 303, a sleeve rod 305 being sleeved on the outside of the fixed post 304, the sleeve rod 305 being inserted into the slot 303, the sleeve rod 305 being fixedly connected to the annular ring 105, a ball 306 being rolled on the rod wall of the fixed post 304, a groove 307 adapted to the ball 306 being opened on the inner wall of the sleeve rod 305, and a magnet 308 fixedly installed at the top end of the sleeve rod 305. Magnet 302 and magnet 308 are separated by an arched plate 101 made of non-ferromagnetic material, forming a cross-medium magnetic coupling transmission between them, which is used to drive the lead block 106 to move out of the opening 104 when the movable rod 301 is pressed.

[0024] The correction assembly includes two arc-shaped groove plates 2 fixedly installed on the top of the arch plate 101. An adjusting rod 201 is slidably installed between the two arc-shaped groove plates 2. Elastic blocks 202 are slidably installed at both ends of the adjusting rod 201. Ball bearings 203 are rolled on the opposite sides of the two elastic blocks 202. Grooves 204 adapted to the ball bearings 203 are opened on the opposite sides of the two arc-shaped groove plates 2. An adjusting frame 205 is slidably installed on the rod wall of the adjusting rod 201. A T-shaped plate 206 is slidably installed inside the adjusting frame 205. An elastic block 207 is installed at the bottom end of the T-shaped plate 206. A ball bearing 208 is rolled on the bottom end of the elastic block 207. Grooves 209 adapted to the ball bearings 208 are evenly opened on the top of the adjusting rod 201. The fixed cylinder 3 is fixedly installed on one side of the adjusting frame 205, and the target frame 107 is fixedly installed on one side of the fixed cylinder 3. The engagement of ball 1 203 with groove 1 204 and the engagement of ball 2 208 with groove 2 209 together constitute the position indication structure. When ball 1 203 and ball 2 208 are respectively engaged in the corresponding groove 1 204 and groove 2 209, the target frame 107 is aligned with the target opening 104 below it, and provides the operator with positioning feedback through the jolt and sound generated during engagement.

[0025] By adopting the above technical solution, when the device needs to be worn on the patient's head, the patient lies supine on the radiotherapy treatment bed. The operator wraps the elastic restraint strap on the mask frame 1 around the patient's head and back of the head, and then tightens it after wrapping it around the patient's head once. This securely restrains the mask frame 1 on the patient's head, ensuring that the entire device does not shift relative to the patient during subsequent CT positioning scans and multiple radiotherapy sessions. The arched plate 101, arched plate 102, and lead cloth 103 all extend forward and upward from the patient's forehead and are suspended in front of the patient's face. The lead cloth 103 does not contact the patient's mouth, nose, or facial skin, and the plane of the lead cloth 103 is roughly parallel to the coronal plane of the patient's head. To adjust the target frame 107 to be directly above the opening 104 of the corresponding affected area, the adjustment frame 205 can be pushed to move the adjustment rod 201 laterally between the two arc-shaped groove plates 2, or the adjustment frame 205 can be pushed to move longitudinally on the rod wall of the adjustment rod 201. At this time, the position of the adjustment frame 205 on the arch plate 101 can be adjusted. While the adjustment frame 205 moves, the target frame 107 will move synchronously through the fixed cylinder 3, thereby achieving the adjustment of the position of the target frame 107. When it is necessary to adjust the longitudinal position of the adjustment frame 205 on the adjustment rod 201, the adjustment frame 205 is pushed to slide on the rod wall of the adjustment rod 201. In the initial state, the second ball 208 is stuck in the inner cavity of one of the two grooves 209. Through the cooperation of the second ball 208 and the second elastic block 207, the adjustment frame 205 will squeeze the second ball 208 out of the inner cavity of the second groove 209 when it moves. The second ball 208 will move away from the adjustment rod 201 and squeeze the second elastic block 207. At this time, the bottom of the second ball 208 will roll on the top plane of the adjustment rod 201. When the second ball 208 enters the position of the next second groove 209, under the action of the second elastic block 207, the second elastic block 207 returns to the initial state and pushes the second ball 208 towards the adjustment rod 201 and into the inner cavity of the second groove 209 to achieve the limit. When the adjusting rod 201 is pushed laterally between the two arc-shaped groove plates 2 by the adjusting frame 205, the ball bearing 203 is initially stuck in the inner cavity of one set of grooves 204. Through the cooperation of the ball bearing 203 and the elastic block 202, the adjusting rod 201 will squeeze the ball bearing 203 out of the inner cavity of the groove 204 when it moves. The ball bearing 203 will move towards the adjusting rod 201 and squeeze the elastic block 202. At this time, the ball bearing 203 will roll on the inner surface of the groove of the arc-shaped groove plate 2. When the ball bearing 203 enters the next groove... When the ball is in position 204, under the force of elastic block 202, elastic block 202 returns to its initial state and pushes ball 203 to move away from adjusting rod 201 and engage in the inner cavity of groove 204 to achieve positioning. During this process, the jerking sensation and sound generated by ball 208 engaging in groove 209 and ball 203 engaging in groove 204 allow the operator to obtain clear positioning feedback without relying on visual inspection, forming a two-way positioning indication, which solves the problem of positioning difficulty caused by the lack of intuitive quantitative indication structure in the prior art. Each set of grooves 209 and each set of grooves 204 are respectively set for the longitudinal lead cloth 103 and the transverse arc surface lead cloth 103. When the ball 208 is inserted into a certain groove 209, the target frame 107 is directly facing the lower longitudinal opening 104; when the ball 203 is inserted into a certain groove 204, the target frame 107 is directly facing the lower transverse arc surface opening 104, thereby enabling the target frame 107 to accurately position the opening 104 of the patient's affected area. When the target frame 107 is aligned with the opening 104 at the patient's affected area, the bottom end of magnet 302 is directly opposite the top end of magnet 308 at the same position. The operator presses the top end of the movable rod 301 and moves it towards the arched plate 101. Initially, magnets 302 and 308 are not within the magnetic attraction distance. The movable rod 301 will drive magnet 302 to move synchronously towards the arched plate 101. When magnet 302 approaches the top surface of the arched plate 101, magnet 302... 02 and magnet 308 enter the magnetic attraction range. At this time, magnet 308 will be attracted by magnet 302 and move towards arch plate 101. While magnet 308 moves, it will drive lead block 106 and ring 105 to move synchronously through sleeve rod 305. The magnetic attraction drive replaces the cumbersome operation of traditional manual patch removal. Only pressing the movable rod 301 is needed to automatically open the target opening 104, avoiding target area dose deviation or accidental obstruction of normal tissue caused by patch misinstallation or missed removal. The groove wall of the irregular groove 307 follows a path that is first vertical and then semi-circular. Through the cooperation of the ball 306 and the irregular groove 307, the sleeve 305 will first move vertically on the outer wall of the fixed column 304. When the ball 306 moves to the bottom of the vertical section of the irregular groove 307, the lead block 106 will drive the ring 105 to move out of the inner cavity of the corresponding opening 104 on the arched plate 102. Then the sleeve 305 continues to slide towards the arched plate 101, at which point the ball 306 will enter the arc-shaped path of the irregular groove 307. At this time, the sleeve rod 305 will deflect. When the ball 306 moves to the bottom of the arc path of the irregular groove 307, the sleeve rod 305 can drive the lead block 106 and the ring 105 to deflect 180°, so that the opening 104 at this position is opened and connected to the opening 104 on the lead cloth 103. By coordinating the precise movement of the target frame 107 with the timing of the magnetic drive, the positioning and opening actions are connected in space and time into a continuous operation process, which greatly reduces the complexity of the positioning operation. At this time, the external therapeutic rays can pass through the target frame 107 and the arched plate 101 to treat the patient's affected area within the opening 104. The arched plate 101 has no significant attenuation effect on the therapeutic rays and does not affect the normal progress of radiotherapy. The lead cloth 103 and the other groups of lead blocks 106 that have not been moved out of the opening 104 work together to shield the rays.

[0026] like Figure 4 and Figure 6 As shown, a circular plate 309 is rotatably mounted on the top wall of the inner cavity of the sleeve rod 305. A spring 310 is fixedly installed between the circular plate 309 and the top of the fixed column 304, which is used to drive the sleeve rod 305 to reset after the magnetic attraction disappears, so that the lead block 106 falls back into the opening 104.

[0027] A rotating plate 314 is rotatably mounted on the top of the inner cavity of the fixed cylinder 3. The movable rod 301 passes through the rotating plate 314 and rotates with it. A spring 315 is fixedly installed between the rotating plate 314 and the bottom wall of the inner cavity of the fixed cylinder 3, which is used to drive the movable rod 301 to return upward after the pressing pressure is released. Insert plates 311 are fixedly installed on both sides of the rod wall of the movable rod 301. A ball 312 is rolled on the top of the insert plate 311. A slot 313 adapted to the ball 312 is opened at the bottom of the fixed cylinder 3. When the movable rod 301 is pressed to the lowest position and rotated, the ball 312 is inserted into the slot 313, locking the movable rod 301 in the pressed state.

[0028] By adopting the above technical solution, when the operator presses the movable rod 301 to move the magnet 302 towards the arched plate 101, the movable rod 301 will drive the rotating plate 314 to move synchronously and squeeze the spring 315. At the same time, the movable rod 301 will drive the insert plate 311 and the ball 312 to move synchronously. When the ball 312 moves to the bottom of the fixed cylinder 3, the movable rod 301 is rotated. The movable rod 301 will drive the insert plate 311 and the magnet 302 to rotate synchronously. The insert plate 311 will drive the ball 312 to move at the bottom of the fixed cylinder 3. When the ball 312 moves to the bottom of the fixed cylinder 3, the movable rod 301 is rotated. The movable rod 301 will drive the insert plate 311 and the magnet 302 to rotate synchronously. The insert plate 311 will drive the ball 312 to move at the bottom of the fixed cylinder 3. 2. When the rod is moved to the position of slot 313, the operator releases the pressure on the movable rod 301. Under the action of spring 315, spring 315 returns to its initial state and pushes the movable rod 301 upward through the rotating plate 314. At this time, the insert plate 311 drives the ball 312 to be inserted into the slot 313 to achieve limit fixation. Through the locking structure of the ball 312 being inserted into the slot 313, the mechanical retention of the pressed state of the movable rod 301 is achieved, so that the operator does not need to apply force continuously during the entire radiotherapy irradiation process, which effectively reduces operator fatigue and is simple, time-saving and labor-saving. By rotating the rotating plate 314 and the movable rod 301, the downward pressing and rotation of the movable rod 301 will not be affected. By setting the ball 312, rolling friction is used instead of sliding friction, which reduces the wear between the insert plate 311 and the bottom surface of the fixed cylinder 3 and extends the service life of the device. When magnet 2 308 moves sleeve rod 305 upward, it will drive circular plate 309 to move upward synchronously and stretch spring 1 310. Through the rotation setting of circular plate 309 and sleeve rod 305, the upward movement and rotation of sleeve rod 305 will not be affected. When the treatment is over and the operator rotates movable rod 301 in the opposite direction to make ball 312 exit the slot 313, spring 1 310 restores its deformation and drives sleeve rod 305 to reset downward. Lead block 106 falls back into opening 104, automatically closing the radiation channel and restoring the initial shielding state without manual intervention.

[0029] like Figure 3 and Figure 4As shown, a connecting plate 316 is provided between the movable rod 301 and the T-shaped plate 206, and the two ends of the connecting plate 316 are rotatably connected to the top of the movable rod 301 and the top of the T-shaped plate 206, respectively.

[0030] By adopting the above technical solution, when the operator presses the movable rod 301 to move towards the arched plate 101, the connecting plate 316 will drive the T-shaped plate 206 to move synchronously. The downward movement of the T-shaped plate 206 will further compress the elastic block 207, causing the ball 208 to be tightly attached to the inner cavity of the groove 209, improving the stability of the adjustment frame 205 on the adjustment rod 201. Through the linkage of the connecting plate 316, while the lead block 106 is moved out by magnetic attraction, the adjustment frame 205 is locked and fixed simultaneously, preventing the target frame 107 from shifting due to vibration or contact during treatment, and further improving the positioning accuracy.

[0031] like Figure 7 As shown, a sealing ring 4 is fixedly installed on the inner wall of the bottom end of the sleeve rod 305. The sealing ring 4 slides and seals with the outer wall of the fixed column 304. The cavity between the sleeve rod 305 and the fixed column 304 is filled with lubricating oil.

[0032] By adopting the above technical solution, the inner cavity of each sleeve rod 305 is filled with lubricating oil. The sealing ring 4 is used to seal the sleeve rod 305 and the fixed column 304, preventing oil leakage during the movement of the sleeve rod 305 on the outer wall of the fixed column 304. The lubricating oil can lubricate the components inside the sleeve rod 305. The lubricating oil effectively reduces the frictional resistance between the ball 306 and the groove 307, so that the magnetic attraction between magnet 1 302 and magnet 2 308 can be more efficiently converted into the lifting power of the sleeve rod 305, avoiding lifting failure due to excessive friction. The sealing ring 4 ensures the long-term sealing of the lubricating oil, ensuring the durability of the lubrication effect and the long-term reliability of the device.

[0033] like Figure 4 and Figure 9 As shown, the magnetic attraction between magnet 302 and magnet 308 is greater than the elastic force of spring 310 and less than the elastic force of spring 315, so that the sleeve rod 305 can overcome the resistance of spring 310 and complete the lifting action under the action of magnetic attraction. At the same time, after the pressing pressure is released, spring 315 can overcome the magnetic attraction and drive the movable rod 301 to return to its original position. The bottom end of the lead block 106 protrudes radially outward to form a flange. The bottom surface of the flange is flush with the bottom surface of the annular ring 105, and the outer diameter of the flange is consistent with the outer diameter of the annular ring 105, so that the lead block 106 and the lead cloth 103 together form a flat radiation shielding surface. Both arched plate 101 and arched plate 2 102 are made of transparent material so that the operator can observe the position and status of the lead block 106 through arched plate 101 and arched plate 2 102.

[0034] Working principle: First, the operator puts the mask frame 1 on the patient's head, wraps the elastic restraint band around the patient's head and tightens it. The arched plate 101, arched plate 202 and lead cloth 103 arch forward and upward from the patient's forehead and are suspended in front of the patient's face. The operator pushes the adjustment frame 205 to slide longitudinally along the adjustment rod 201 or pushes the adjustment rod 201 to move laterally along the arc-shaped groove plate 2. When the ball 1 203 is inserted into the groove 204 at the corresponding lateral position and the ball 2 208 is inserted into the groove 209 at the corresponding longitudinal position, the target frame 107 is aligned with the opening 104 corresponding to the patient's affected area, thus completing the positioning error correction. Pressing the movable rod 301 moves it towards the arched plate 101. Magnet 302 approaches the arched plate 101 and enters the magnetic attraction distance with magnet 308. Magnet 302 drives magnet 308 through the arched plate 101. Magnet 308 drives the sleeve rod 305 to rise vertically along the fixed column 304. The annular ring 105 and lead block 106 rise simultaneously and move out of the opening 104. As the sleeve rod 305 continues to rise, the ball 306 enters the arc section of the irregular groove 307, driving the sleeve rod 305 to rotate 180°. The annular ring 105 and lead block 106 move out of the opening 104. 6. The rod is deflected to the side of the opening 104, and the opening 104 is fully exposed to form a ray channel. The movable rod 301 is rotated until the ball 312 is inserted into the slot 313, keeping the magnetic attraction between magnet 1 302 and magnet 2 308, so that the opening 104 remains open during the treatment. At this time, the treatment can be carried out through the target frame 107. As the movable rod 301 moves down, it will also drive the T-shaped plate 206 to move synchronously through the connecting plate 316, causing the T-shaped plate 206 to further compress the elastic block 207, improving the stability of the adjusting frame 205 on the adjusting rod 201. After treatment, the movable rod 301 is rotated in the opposite direction to make the ball 312 exit the slot 313. The second spring 315 drives the movable rod 301 to return to its original position. The magnetic attraction weakens, and the first spring 310 drives the sleeve rod 305 to descend and return to its original position. The rolling ball 306 slides in the opposite direction along the irregular groove 307. The annular ring 105 and the lead block 106 rotate 180° in the opposite direction and fall back into the opening 104, sealing the radiation channel.

[0035] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A positioning error correction auxiliary device for head radiotherapy, comprising a mask frame (1), wherein an arched plate one (101) and an arched plate two (102) are fixedly installed on one side of the mask frame (1) from top to bottom, and a lead cloth (103) is pasted on the bottom surface of the arched plate two (102), and corresponding openings (104) are evenly provided on the arched plate two (102) and the lead cloth (103). Its features are, Also includes: A correction component is disposed on the arched plate (101) and is used to provide position indication during the movement of the target frame (107) to assist the operator in quickly positioning the target frame (107) directly above the target opening (104); An adjustment component is disposed between the target frame (107) and the lead cloth (103) for moving the lead block (106) in the target opening (104) out of the opening (104) in response to an external triggering action after the target frame (107) is positioned, so as to form an unobstructed ray channel.

2. The positioning error correction auxiliary device for head radiotherapy according to claim 1, characterized in that: The adjustment assembly includes a fixed cylinder (3), a movable rod (301) inserted inside the fixed cylinder (3), a magnet (302) fixedly installed at the bottom end of the movable rod (301), and slots (303) evenly opened on the top surface of the arched plate (102). Each set of slots (303) is connected to the adjacent opening (104). An annular ring (105) is provided in the opening (104), and a lead block (106) is installed in the annular ring (105). The slots (303) are fixedly installed in the openings (303). A fixed post (304) is fixedly installed, and a sleeve rod (305) is sleeved on the outside of the fixed post (304). The sleeve rod (305) is inserted into the slot (303) and fixedly connected to the annular ring (105). A ball (306) is rolled on the rod wall of the fixed post (304). A shaped groove (307) adapted to the ball (306) is opened on the inner wall of the sleeve rod (305). A magnet (308) is fixedly installed at the top of the sleeve rod (305). The first magnet (302) and the second magnet (308) are separated by an arched plate (101) made of non-ferromagnetic material, forming a cross-medium magnetic coupling transmission between them, which is used to drive the lead block (106) to move out of the opening (104) when the movable rod (301) is pressed.

3. The positioning error correction auxiliary device for head radiotherapy according to claim 2, characterized in that: The correction assembly includes two arc-shaped groove plates (2) fixedly installed on the top of the arched plate (101). An adjusting rod (201) is slidably installed between the two arc-shaped groove plates (2). An elastic block (202) is slidably installed at both ends of the adjusting rod (201). A ball bearing (203) is rolled on the opposite sides of the two elastic blocks (202). The opposite sides of the two arc-shaped groove plates (2) are provided with a ball bearing (203) that is compatible with the ball bearing (203). The adjustment rod (201) has a groove (204), an adjustment frame (205) is slidably installed on the rod wall, a T-shaped plate (206) is slidably installed inside the adjustment frame (205), an elastic block (207) is installed at the bottom end of the T-shaped plate (206), a ball bearing (208) is slidably installed at the bottom end of the elastic block (207), and a groove (209) is evenly provided on the top of the adjustment rod (201) to match the ball bearing (208). The fixed cylinder (3) is fixedly installed on one side of the adjusting frame (205), and the target frame (107) is fixedly installed on one side of the fixed cylinder (3). The engagement of the first ball (203) with the first groove (204) and the engagement of the second ball (208) with the second groove (209) together constitute a position indication structure. When the first ball (203) and the second ball (208) are respectively engaged in the corresponding first groove (204) and second groove (209), the target frame (107) is aligned with the target opening (104) below it, and provides the operator with positioning feedback through the jolt and sound generated during engagement.

4. The positioning error correction auxiliary device for head radiotherapy according to claim 2, characterized in that: A circular plate (309) is rotatably mounted on the top wall of the inner cavity of the sleeve (305). A spring (310) is fixedly mounted between the circular plate (309) and the top of the fixed column (304) to drive the sleeve (305) to reset after the magnetic attraction disappears, so that the lead block (106) falls back into the opening (104).

5. The positioning error correction auxiliary device for head radiotherapy according to claim 4, characterized in that: A rotating plate (314) is rotatably installed on the top of the inner cavity of the fixed cylinder (3). The movable rod (301) passes through the rotating plate (314) and rotates with it. A spring (315) is fixedly installed between the rotating plate (314) and the bottom wall of the inner cavity of the fixed cylinder (3) to drive the movable rod (301) to reset upward after the pressure is released. Insert plates (311) are fixedly installed on both sides of the movable rod (301). A ball (312) is rolled on the top of the insert plate (311). A slot (313) adapted to the ball (312) is opened at the bottom of the fixed cylinder (3). When the movable rod (301) is pressed to the lowest position and rotated, the ball (312) is inserted into the slot (313) and the movable rod (301) is locked in the pressed state.

6. The positioning error correction auxiliary device for head radiotherapy according to claim 2, characterized in that: A connecting plate (316) is provided between the movable rod (301) and the T-shaped plate (206), and the two ends of the connecting plate (316) are rotatably connected to the top ends of the movable rod (301) and the T-shaped plate (206), respectively.

7. The positioning error correction auxiliary device for head radiotherapy according to claim 2, characterized in that: A sealing ring (4) is fixedly installed on the inner wall of the bottom end of the sleeve (305). The sealing ring (4) slides and seals with the outer wall of the fixed column (304). The cavity between the sleeve (305) and the fixed column (304) is filled with lubricating oil.

8. The positioning error correction auxiliary device for head radiotherapy according to claim 5, characterized in that: The magnetic attraction between the first magnet (302) and the second magnet (308) is greater than the elastic force of the first spring (310) and less than the elastic force of the second spring (315), so that the sleeve rod (305) can overcome the resistance of the first spring (310) and complete the lifting action under the action of the magnetic attraction. At the same time, after the pressing pressure is released, the second spring (315) can overcome the magnetic attraction and drive the movable rod (301) to return to its original position.

9. The positioning error correction auxiliary device for head radiotherapy according to claim 2, characterized in that: The bottom end of the lead block (106) protrudes radially outward to form a flange. The bottom surface of the flange is flush with the bottom surface of the annular ring (105), and the outer diameter of the flange is consistent with the outer diameter of the annular ring (105), so that the lead block (106) and the lead cloth (103) together form a flat radiation shielding surface.

10. The positioning error correction auxiliary device for head radiotherapy according to claim 1, characterized in that: Both the first arched plate (101) and the second arched plate (102) are made of transparent material so that the operator can observe the position of the lead block (106) through the first arched plate (101) and the second arched plate (102).

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