A visual guidance assisted positioning device for precise positioning of a radiotherapy patient

Abstract

This invention discloses a visually guided auxiliary positioning device for precise placement of radiotherapy patients. It includes a radiotherapy main unit with a treatment bed on one side. Above the treatment bed are two annular plates forming a semi-circular structure. A visual guidance mechanism is located on one side of each annular plate, and an auxiliary positioning mechanism is located on the other side. The visual guidance mechanism includes a first inner groove formed inside the annular plate, and a top groove communicating with the first inner groove is formed on the outer surface of the annular plate. This invention, by setting up an annular movable visual guidance mechanism and using a motor-driven steel wire rope transmission, combined with an annular slide and pulley guide structure, achieves full-range annular position adjustment of the visual positioning component. With a flip angle fine-tuning structure, it can adapt to the positioning needs of lesions in different parts of the patient's body, such as the head and neck, chest and abdomen, and limbs, from multiple angles without blind spots. This solves the problems of fixed visual positioning range and poor adaptability of traditional equipment, significantly improving the positioning accuracy and flexibility of radiotherapy placement.

Description

Technical Field

[0001] This invention relates to the field of radiotherapy equipment positioning technology, and in particular to a visually guided auxiliary positioning device for precise positioning of radiotherapy patients. Background Technology

[0002] Radiotherapy is one of the core methods of clinical cancer treatment. Its treatment principle is to use high-energy rays to precisely target the tumor lesion, kill cancer cells, and at the same time protect the surrounding normal tissues and organs to the greatest extent. The core key to radiotherapy lies in the accuracy and repeatability of patient positioning. Positioning errors directly determine the accuracy of radiotherapy dose distribution. If the positioning deviation is too large, it is easy to cause problems such as missed radiation to the target area and excessive radiation to normal tissues, which will not only reduce the treatment effect, but also cause serious radiotherapy side effects and affect the patient's prognosis.

[0003] Currently, in clinical radiotherapy positioning, the mainstream method relies on medical staff manually positioning the patient using a laser positioning device, supplemented by simple fixation pads to limit the patient's body position. This traditional positioning method has several inherent drawbacks: First, manual positioning depends on the clinical experience of medical staff, which is highly subjective and lacks standardization. The positioning accuracy varies greatly among different operators, making it difficult to control single positioning errors and resulting in extremely poor repeatability, failing to meet the high precision requirements of accurate radiotherapy. Second, the visual positioning structure of existing positioning equipment is mostly fixed, with fixed monitoring angles and coverage areas. It cannot be dynamically adjusted across the entire area according to the patient's lesion location and body shape, making it difficult to adapt to the radiotherapy positioning needs of different parts of the body, such as the head and neck, chest and abdomen, and limbs, resulting in poor adaptability. Third, patient positioning often uses a single soft pad for fixation, with no adjustable fixation force or range. During radiotherapy, patients are prone to positional shifts due to slight body movements and respiratory fluctuations, resulting in insufficient stability.

[0004] Therefore, based on the above-mentioned technical problems, it is necessary for those skilled in the art to develop a visually guided assisted positioning device for precise placement of radiotherapy patients. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a visually guided auxiliary positioning device for precise positioning of radiotherapy patients, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: A visually guided auxiliary positioning device for precise positioning of radiotherapy patients includes a radiotherapy host body, a treatment bed on one side of the radiotherapy host body, two annular plates with a semi-circular structure above the treatment bed, a visual guidance mechanism on one side of the annular plates, and an auxiliary positioning mechanism on the other side. The visual guidance mechanism includes a first inner groove formed inside the annular plate, and a top groove connected to the first inner groove on the outer surface of the annular plate. Two rows of sliding pillars are arranged in an array along the annular direction inside the first inner groove. A sliding plate is slidably connected inside the first inner groove, with the bottom surface of the sliding plate contacting the top surface of the arrayed sliding pillars. A support frame is fixedly installed on the top surface of the sliding plate, passing through the top groove and slidably connected to it. A second motor is fixedly installed on one side of the support frame, and a drive shaft is fixedly connected to the output end of the second motor. The drive shaft and the support frame are rotatably connected via bearings. A connecting arm is fixedly sleeved on the outside of the drive shaft, and a visual positioning component is fixedly assembled at the end of the connecting arm. Two first round rods are symmetrically rotatably connected to the end of the first inner groove near the annular plate via bearings. A coil is fixedly sleeved on the outside of each of the two first round rods. A side cover is fixedly installed on the outside of the annular plate. The first round rods pass through the annular plate and the side cover and are rotatably connected to the bearings of both. A third gear that meshes with each other is fixedly sleeved on the rod body of each of the two first round rods located inside the side cover. A first motor is fixedly installed on the outside of the side cover, and the output end of the first motor is fixedly connected to one of the first round rods. The first steel wire rope and the second steel wire rope are fixedly connected to both sides of the slide plate respectively. One end of the first steel wire rope is fixedly connected to the corresponding side reel and the rope body slides in contact with the top surface of the slide column. One end of the second steel wire rope is fixedly connected to the other side reel and the rope body slides through the gap between the two rows of slide columns while in contact with the top surface of the slide column.

[0007] In order to solve the problems of wire rope slippage and insufficient positioning adjustment accuracy, the first inner groove is rotatably connected to the first positioning pulley and the second positioning pulley through bearings, and the rope body of the second wire rope rolls and fits in close contact with the first positioning pulley and the second positioning pulley.

[0008] To address the issues of unstable patient positioning, easy slight displacement, and poor fit during radiotherapy, the auxiliary positioning mechanism includes a second inner groove symmetrically distributed within the annular plate. Two limiting slide plates are fixedly installed inside the second inner groove, and a second annular inner toothed plate and an annular outer toothed plate are sequentially slidably fitted onto the two limiting slide plates from the outside in. A rotating shaft is rotatably connected to the second inner groove via a bearing, and the end of the rotating shaft extends to the outside of the annular plate and is rotatably connected to the bearing of the annular plate. A second gear is fixedly fitted onto the outside of the rotating shaft, and the second gear meshes with both the second annular inner toothed plate and the annular outer toothed plate for transmission. The annular plate has two side grooves on its side, corresponding to the second annular inner toothed plate and the annular outer toothed plate respectively. A slider is fixedly provided on the outer side of both the second annular inner toothed plate and the annular outer toothed plate. The slider passes through the corresponding side groove and slides in cooperation with the side groove. An installation plate is fixedly mounted on the outer side of the slider on both sides. A positioning sleeve is fixedly provided on the outer side of the installation plate. A fixing pad is placed above the treatment bed. Insert rods are fixedly installed at the corners on both sides of the fixing pad. The insert rods are inserted into the positioning sleeve.

[0009] To address the issues of asynchronous positioning and positioning deviation between the two auxiliary positioning mechanisms, a square shell is fixedly mounted on the outer side of one of the annular plates. A rotating shaft on the corresponding side passes through the square shell and is rotatably connected to a bearing within the square shell. A second bevel gear is fixedly fitted onto the shaft inside the square shell. A third motor is fixedly installed on the outer side of the square shell, and a second round rod is fixedly connected to the output end of the third motor. The second round rod extends into the square shell and is rotatably connected to a bearing within the square shell. A first bevel gear is fixedly mounted at the end of the second round rod, and the first bevel gear meshes with the second bevel gear for transmission. A square rod is fixedly connected to the end of the rotating shaft equipped with the second bevel gear, and a rotating sleeve is fixedly connected to the end of the other rotating shaft. The square rod is slidably inserted into the rotating sleeve to realize the synchronous rotation of the two rotating shafts.

[0010] To address the issues of unstable positioning and installation of the annular plate and the inability to flexibly rotate and adjust the monitoring angle, the treatment bed is symmetrically equipped with two base plates at its bottom. Each of the two base plates has a base fixedly mounted on the same side, and the end of the annular plate is engaged with the inside of the base.

[0011] To address the issues of rotational jamming, limited angle adjustment range, and poor positioning guidance of the annular plate, side frames are fixedly installed on the side of each of the two base plates away from the base. Two limiting sliders are symmetrically fixed inside the side frames. Limiting grooves are formed on both sides of the annular plate, and the limiting sliders slide in cooperation with the limiting grooves. A first annular internal gear plate is fixedly mounted on the inner surface of the annular plate. A housing is fixedly installed on the outer side of the side frames, and a fourth motor is fixedly installed inside the housing. A transmission rod is fixedly connected to the output end of the fourth motor, and the transmission rod passes through the side frame and is rotatably connected to the side frame bearing. A first gear is fixedly sleeved on the outside of the transmission rod, and the first gear meshes with the first annular internal gear plate for transmission.

[0012] To address the issue of the inability to adjust the longitudinal position of the treatment bed and positioning mechanism to accommodate different patient heights, a threaded block is fixedly mounted on the top of one of the base plates; two fixed plates are fixedly mounted on the bottom of the treatment bed, and two slide rods are symmetrically fixed between the two fixed plates; slide rod sleeves are symmetrically fixed on both sides of the top of the two base plates, and the slide rods pass through the corresponding slide rod sleeves and slide in cooperation with the slide rod sleeves; a lead screw is rotatably connected between the two fixed plates via a bearing, and the lead screw is threadedly connected to the threaded block; a fifth motor is fixedly mounted on the outside of one of the fixed plates, and the output end of the fifth motor is fixedly connected to the lead screw.

[0013] To address the issue of the fixed spacing between the two annular plates failing to accommodate the positioning needs of patients with different body shapes, a handwheel is mounted on one side of one of the base plates. A threaded rod is fixedly connected to the inner side of the handwheel, and the threaded rod passes through one of the base plates and is threadedly connected to it. The end of the threaded rod away from the handwheel is rotatably connected to a bearing on the other base plate. Two sliding rods are fixedly provided on one side of the other base plate, and the sliding rods pass through the corresponding base plates and slide in cooperation with them.

[0014] To address the issue of poor load-bearing stability of the treatment bed, multiple support columns are fixedly installed at the bottom of the treatment bed.

[0015] To address the issue of automated equipment control, a controller is fixedly installed on the side of the radiotherapy host body furthest from the treatment bed.

[0016] The above technical solution has the following beneficial effects: 0. This invention features a ring-shaped moving visual guidance mechanism. Driven by a motor and a steel wire rope, and in conjunction with a ring-shaped groove and pulley guide structure, it enables full-range ring-shaped position adjustment of the visual positioning component. Combined with a flip angle fine-tuning structure, it can adapt to the lesion positioning needs of patients in different parts of the head, neck, chest, abdomen, and limbs from multiple angles without blind spots. This solves the problems of fixed visual positioning range and poor adaptability of traditional equipment, and significantly improves the positioning accuracy and flexibility of radiotherapy positioning.

[0017] 0. This invention employs a bidirectional synchronous transmission auxiliary positioning mechanism. A single motor drives the two rotating shafts to rotate synchronously. Utilizing the reverse sliding structure of the inner and outer toothed plates, the fixing pad adaptively unfolds and presses against the patient's body. The fixing range and fixing force can be flexibly adjusted according to the patient's body shape and position. The fixing fit is high and the stability is strong, effectively eliminating positioning errors caused by slight body movements and respiratory deviations during radiotherapy, and ensuring that the radiotherapy dose is accurately applied to the lesion target area.

[0018] 0. This invention adjusts the distance between the two annular plates by hand cranking, adjusts the lateral position of the treatment bed by screw drive, and adjusts the rotation angle of the annular plates by gear drive. It can adapt to patients with different heights, body types and lesion locations in multiple dimensions, greatly improving the versatility and adaptability of the equipment and solving the defects of traditional equipment with single adjustment and narrow application range. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0021] Figure 1 This is a front view of the overall structure provided by the present invention; Figure 2 A bottom view of the overall structure provided for this invention; Figure 3 A perspective view of the fixing plate provided by the present invention; Figure 4 A perspective view of the base plate provided for this invention; Figure 5 Cross-sectional view of the annular plate provided by the present invention Figure 1 ; Figure 6 A cross-sectional view of the visual guidance mechanism provided by the present invention; Figure 7 This is a sectional view of the base plate provided by the present invention; Figure 8 Cross-sectional view of the annular plate provided by the present invention Figure 2 ; Figure 9 A cross-sectional view of the auxiliary positioning mechanism provided by the present invention; Figure 10 A perspective view of the auxiliary positioning mechanism provided by the present invention; Figure 11 Provided by the present invention Figure 4 Enlarged view of point A in the image; Figure 12 Provided by the present invention Figure 4Enlarged view of point B in the image; Figure 13 Provided by the present invention Figure 6 Enlarged view of point C in the image; Figure 14 Provided by the present invention Figure 7 Enlarged view of point D in the image; Figure 15 Provided by the present invention Figure 8 Enlarged view of point E in the image; Figure 16 A perspective view of the annular plate provided by the present invention.

[0022] In the diagram: 1. Main body of the radiotherapy unit; 2. Controller; 3. Treatment bed; 4. Support column; 5. Annular plate; 6. Fixing pad; 7. Base plate; 8. Fixing plate; 9. Slide rod; 10. Threaded rod; 11. Hand crank; 12. Slide rod; 13. Base; 14. Housing; 15. Side cover; 16. First motor; 17. First annular internal gear plate; 18. Support frame; 19. Second motor; 20. Connecting arm; 21. Visual positioning component; 22. Threaded block; 23. Side frame; 24. Slide rod sleeve; 25. Top groove; 26. Side groove; 27. Mounting plate; 28. Rotating sleeve; 29. ​​Square rod; 30. Transmission rod; 31. First gear; 32. First inner groove 33. Sliding column; 34. Sliding plate; 35. Drive shaft; 36. Positioning sleeve; 37. Insert rod; 38. Second inner groove; 39. Second annular inner toothed plate; 40. Annular outer toothed plate; 41. Limiting sliding plate; 42. Second gear; 43. Rotating shaft; 44. First round rod; 45. Third gear; 46. Square shell; 47. Third motor; 48. Wire reel; 49. First positioning pulley; 50. Second positioning pulley; 51. First wire rope; 52. Second wire rope; 53. Fourth motor; 54. Second round rod; 55. First bevel gear; 56. Second bevel gear; 57. Fifth motor; 58. Lead screw; 59. Limiting slider; 60. Limiting groove. Detailed Implementation

[0023] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] See Figures 1-16 As shown, the present invention provides a visual guidance-assisted positioning device for precise positioning of radiotherapy patients, including a radiotherapy host body 1, a treatment bed 3 on one side of the radiotherapy host body 1, two annular plates 5 with a semi-circular structure above the treatment bed 3, a visual guidance mechanism on one side of the annular plate 5, and an auxiliary positioning mechanism on the other side. The visual guidance mechanism includes a first inner groove 32 formed inside the annular plate 5, and a top groove 25 connected to the first inner groove 32 on the outer surface of the annular plate 5. Two rows of sliding columns 33 are arranged in an array along the annular direction inside the first inner groove 32. A sliding plate 34 is slidably connected inside the first inner groove 32, and the bottom surface of the sliding plate 34 contacts the top surface of the arrayed sliding columns 33. A support frame 18 is fixedly installed on the top surface of the sliding plate 34, and the support frame 18 passes through the top groove 25 and is slidably connected to it. A second motor 19 is fixedly installed on one side of the support frame 18, and a drive shaft 35 is fixedly connected to the output end of the second motor 19. The drive shaft 35 and the support frame 18 are rotatably connected via bearings. A connecting arm 20 is fixedly sleeved on the outside of the drive shaft 35, and a visual positioning component 21 is fixedly assembled at the end of the connecting arm 20. Two first round rods 44 are symmetrically rotatably connected to the end of the first inner groove 32 near the annular plate 5 via bearings. A coil 48 is fixedly sleeved on the outside of each of the two first round rods 44. A side cover 15 is fixedly installed on the outside of the annular plate 5. The first round rods 44 pass through the annular plate 5 and the side cover 15 and are rotatably connected to the bearings of both. A third gear 45 that meshes with each other is fixedly sleeved on the rod body of each of the two first round rods 44 inside the side cover 15. A first motor 16 is fixedly installed on the outside of the side cover 15. The output end of the first motor 16 is fixedly connected to one of the first round rods 44. The first steel wire rope 51 and the second steel wire rope 52 are fixedly connected to both sides of the slide plate 34 respectively. One end of the first steel wire rope 51 is fixedly connected to the corresponding side reel 48 and the rope body slides in contact with the top surface of the slide column 33. One end of the second steel wire rope 52 is fixedly connected to the other side reel 48. The rope body slides in contact with the top surface of the slide column 33 and passes through the gap between the two rows of slide columns 33. The first positioning pulley 49 and the second positioning pulley 50 are rotatably connected to the inside of the first inner groove 32 through bearings. The rope body of the second steel wire rope 52 rolls and fits in contact with the first positioning pulley 49 and the second positioning pulley 50.

[0025] Working principle of visual guidance mechanism: The visual guidance mechanism is used to achieve the annular global position adjustment and angle fine-tuning of the visual positioning component 21, thereby completing the precise visual positioning of the patient's lesion. When the device is working, the first motor 16 starts and drives the corresponding first round rod 44 to rotate. Through the transmission of two meshing third gears 45, the two first round rods 44 rotate synchronously in opposite directions, which in turn drives the two reels 48 to synchronously wind and unwind the rope. One reel 48 winds up the first steel wire rope 51, and the other reel 48 unwinds the second steel wire rope 52. With the sliding support and guidance of the two rows of sliding columns 33, the slide plate 34 is smoothly pulled to slide along the annular trajectory inside the first inner groove 32.

[0026] During the sliding of the slide plate 34, the top support frame 18 slides synchronously along the top groove 25, realizing dynamic adjustment of the annular position of the visual positioning component 21. At the same time, the second steel wire rope 52 rolls and slides against the first positioning pulley 49 and the second positioning pulley 50, which can effectively limit the deviation and vibration of the steel wire rope, and improve the stability and positioning accuracy of the slide plate 34. Meanwhile, starting the second motor 19 can drive the transmission shaft 35 to rotate, which drives the connecting arm 20 and the visual positioning component 21 at the end to flip and fine-tune the angle. Combined with the annular position adjustment, it can realize multi-angle, full-coverage visual scanning positioning, accurately capture the location of the patient's lesion, and provide a precise visual reference for radiotherapy positioning.

[0027] The auxiliary positioning mechanism includes a second inner groove 38 formed inside the annular plate 5, which is symmetrically distributed with the first inner groove 32. Two limiting slide plates 41 are fixedly installed inside the second inner groove 38. The two limiting slide plates 41 are slidably fitted with a second annular inner toothed plate 39 and an annular outer toothed plate 40 from the outside to the inside. A rotating shaft 43 is rotatably connected inside the second inner groove 38 through a bearing. The end of the rotating shaft 43 extends to the outside of the annular plate 5 and is rotatably connected to the bearing of the annular plate 5. A second gear 42 is fixedly fitted outside the rotating shaft 43. The second gear 42 meshes with both the second annular inner toothed plate 39 and the annular outer toothed plate 40 for transmission. The annular plate 5 has two side grooves 26 on its side, corresponding to the second annular inner toothed plate 39 and the annular outer toothed plate 40 respectively. The second annular inner toothed plate 39 and the annular outer toothed plate 40 are both fixedly provided with sliders. The sliders pass through the corresponding side grooves 26 and slide in cooperation with the side grooves 26. Mounting plates 27 are fixedly mounted on the outer sides of the sliders on both sides. Positioning sleeves 36 are fixedly provided on the outer sides of the mounting plates 27. A fixing pad 6 is placed above the treatment bed 3. Insert rods 37 are fixedly installed at the corners on both sides of the fixing pad 6. The insert rods 37 are inserted into the positioning sleeves 36. A square shell 46 is fixedly mounted on the outer side of one of the annular plates 5. A rotating shaft 43 on the corresponding side passes through the square shell 46 and is rotatably connected to the bearing of the square shell 46. A second bevel gear 56 is fixedly sleeved on the shaft body of the rotating shaft 43 inside the square shell 46. A third motor 47 is fixedly installed on the outer side of the square shell 46. A second round rod 54 is fixedly connected to the output end of the third motor 47. The second round rod 54 extends into the inside of the square shell 46 and is rotatably connected to the bearing of the square shell 46. A first bevel gear 55 is fixedly mounted at the end of the second round rod 54. The first bevel gear 55 meshes with the second bevel gear 56 for transmission. A square rod 29 is fixedly connected to the end of the rotating shaft 43 equipped with the second bevel gear 56, and a rotating sleeve 28 is fixedly connected to the end of the other rotating shaft 43. The square rod 29 is slidably inserted into the rotating sleeve 28 to realize the synchronous rotation of the two rotating shafts 43.

[0028] Working principle of auxiliary positioning mechanism The auxiliary positioning mechanism is used to achieve adaptive compression and fixation of the patient's body position, preventing slight displacement of the patient's body during radiotherapy. During the positioning operation, the fixation pad 6 is laid on the outside of the patient's body, and the insertion rod 37 at the corner of the fixation pad 6 is inserted into the positioning sleeve 36 to complete the pre-fixation of the fixation pad 6. Then, the third motor 47 is started, which drives the second round rod 54 and the first bevel gear 55 to rotate. Through the meshing transmission of the bevel gears, the second bevel gear 56 and the single-sided rotating shaft 43 are rotated.

[0029] With the insertion and engagement of the square rod 29 and the rotating sleeve 28, the rotating shafts 43 on both sides rotate synchronously in the same direction, effectively preventing the positioning mechanism from shifting or misaligning. The rotating shaft 43 drives the second gear 42 to rotate, and by utilizing the bidirectional meshing characteristics of the gear, it synchronously drives the second annular inner tooth plate 39 and the annular outer tooth plate 40 to slide in the opposite direction along the limiting slide plate 41. The two tooth plates drive the outer slider to slide along the side groove 26, and then drive the two sets of positioning sleeves 36 to open in the opposite direction through the mounting plate 27, pulling the fixing pad 6 to spread evenly and tightly fit and press against the patient's body. The fixing force and fitting range are adaptively adjusted according to the patient's body shape to achieve stable positioning and fixation of the patient's body position.

[0030] The treatment bed 3 has two symmetrically arranged base plates 7 at its bottom. A base 13 is fixedly mounted on the same side of each of the two base plates 7. The end of the annular plate 5 is engaged with the inside of the base 13. A side frame 23 is fixedly mounted on the side of each of the two base plates 7 away from the base 13. Two limiting sliders 59 are symmetrically fixed on the inner side of the side frame 23. Limiting grooves 60 are formed on both sides of the annular plate 5, and the limiting sliders 59 slide in cooperation with the limiting grooves 60. A first annular internal toothed plate 17 is fixedly mounted on the inner surface of the annular plate 5. A housing 14 is fixedly mounted on the outer side of the side frame 23, and a fourth motor 53 is fixedly installed inside the housing 14. A transmission rod 30 is fixedly connected to the output end of the fourth motor 53. The transmission rod 30 passes through the side frame 23 and is rotatably connected to the bearing of the side frame 23. A first gear 31 is fixedly sleeved on the outside of the transmission rod 30, and the first gear 31 meshes with the first annular internal toothed plate 17 for transmission.

[0031] Working principle: The annular plate angle adjustment mechanism is used to achieve overall rotational positioning of the annular plate, adapting to the monitoring and positioning needs of radiotherapy at different sites. During operation, the fourth motor 53 is activated, driving the transmission rod 30 and the first gear 31 to rotate. The first gear 31 meshes with the first annular internal gear plate 17, driving the annular plate 5 to rotate as a whole. During the rotation of the annular plate 5, the limiting slider 59 on the inner side of the side frame 23 engages and slides inside the limiting groove 60, providing precise guidance and limiting to prevent deviation, ensuring that the rotation of the annular plate 5 is smooth without jamming or offset. After adjustment, the end of the annular plate 5 is locked into the base 13, providing a stable installation support benchmark for visual positioning and body fixation.

[0032] One of the base plates 7 has a threaded block 22 fixedly mounted on its top; the treatment bed 3 has two fixed plates 8 fixedly mounted on its bottom, and two sliding rods 9 are symmetrically fixed between the two fixed plates 8; sliding rod sleeves 24 are symmetrically fixed on both sides of the top of the two base plates 7, and the sliding rods 9 pass through the corresponding sliding rod sleeves 24 and slide in cooperation with the sliding rod sleeves 24; a lead screw 58 is rotatably connected between the two fixed plates 8 through a bearing, and the lead screw 58 is threadedly connected to the threaded block 22; a fifth motor 57 is fixedly mounted on the outside of one of the fixed plates 8, and the output end of the fifth motor 57 is fixedly connected to the lead screw 58; a hand crank 11 is mounted on one side of one of the base plates 7, and a threaded rod 10 is fixedly connected to the inside of the hand crank 11, and the threaded rod 10 passes through one of the base plates 7 and is threadedly connected to the base plate 7; the end of the threaded rod 10 away from the hand crank 11 is rotatably connected to the bearing of the other base plate 7; two sliding rods 12 are fixedly mounted on one side of the other base plate 7, and the sliding rods 12 pass through the corresponding base plate 7 and slide in cooperation with the base plate 7.

[0033] Working principle: The bed and base adjustment mechanism is designed to accommodate patients of different body types, flexibly adjusting the overall spacing and lateral position of the equipment to enhance its versatility. During spacing adjustment, the handwheel 11 is manually rotated, causing the threaded rod 10 to rotate. This threaded transmission drives one of the base plates 7 to move horizontally. Simultaneously, the sliding rod 12 acts as a guide and limiter, ensuring smooth translation of the base plate 7. This allows for adjustment of the spacing between the two base plates 7 and the top annular plate 5, adapting to the positioning needs of patients of varying sizes.

[0034] When adjusting the lateral position, the fifth motor 57 is started to drive the lead screw 58 to rotate. The lead screw 58 and the threaded block 22 are threaded together to drive the treatment bed 3 to slide laterally along the slide rod 9 and the slide rod sleeve 24. This precisely adjusts the relative position of the treatment bed 3 and the annular plate 5, matching the lesion location and height differences of different patients, and greatly improving the equipment's adaptability.

[0035] The bottom of the treatment bed 3 is fixedly equipped with multiple support columns 4.

[0036] Working principle: Multiple support columns 4 evenly distributed at the bottom of the treatment bed 3 can evenly distribute the weight of the treatment bed 3 and the patient, effectively reducing the deformation and shaking caused by long-term stress on the treatment bed 3, improving the overall structural stability of the treatment bed 3, avoiding positioning errors caused by bed shaking during radiotherapy positioning and treatment, and providing a stable bearing foundation for accurate positioning.

[0037] The controller 2 is fixedly installed on the side of the radiotherapy host body 1 away from the treatment bed 3.

[0038] Working principle: Controller 2, as the core control terminal of the equipment, is electrically connected to the first motor 16, the second motor 19, the third motor 47, the fourth motor 53, the fifth motor 57, and the visual positioning component 21. Medical staff can centrally input control commands through controller 2 to uniformly regulate the start-up, shutdown, speed, and stroke of each mechanism, realizing automated linkage operations for visual positioning, ring plate angle adjustment, patient position fixation, and bed position adjustment. This simplifies the operation process, reduces human error, and improves positioning efficiency and accuracy. Simultaneously, it can store positioning parameters for different lesion sites, enabling standardized and repetitive positioning.

[0039] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A visually guided positioning device for precise placement of radiotherapy patients, comprising a radiotherapy main unit (1), characterized in that: The radiotherapy host body (1) has a treatment bed (3) on one side, and two ring plates (5) with a semi-circular structure are provided above the treatment bed (3). A visual guidance mechanism is provided on one side of the ring plate (5), and an auxiliary positioning mechanism is provided on the other side. The visual guidance mechanism includes a first inner groove (32) opened inside the annular plate (5), and a top groove (25) connected to the first inner groove (32) is opened on the outer ring surface of the annular plate (5); two rows of sliding columns (33) are arranged in an array along its annular direction inside the first inner groove (32), and a sliding plate (34) is slidably connected inside the first inner groove (32), the bottom surface of the sliding plate (34) is in contact with the top surface of the arrayed sliding columns (33); a support frame (18) is fixedly installed on the top surface of the sliding plate (34), the support frame (18) passes through the top groove (25) and is slidably connected to the top groove (25); a second motor (19) is fixedly installed on one side of the support frame (18), and a transmission shaft (35) is fixedly connected to the output end of the second motor (19), and the transmission shaft (35) and the support frame (18) are rotatably connected by a bearing; a connecting arm (20) is fixedly sleeved on the outside of the transmission shaft (35), and a visual positioning component (21) is fixedly assembled at the end of the connecting arm (20). Two first round rods (44) are symmetrically rotatably connected to the end of the first inner groove (32) near the annular plate (5) via bearings. A coil (48) is fixedly sleeved on the outside of each of the two first round rods (44). A side cover (15) is fixedly installed on the outside of the annular plate (5). The first round rods (44) pass through the annular plate (5) and the side cover (15) and are rotatably connected to the bearings of both. A third gear (45) that meshes with each other is fixedly sleeved on the rod body of each of the two first round rods (44) inside the side cover (15). A first motor (16) is fixedly installed on the outside of the side cover (15). The output end of the first motor (16) is fixedly connected to one of the first round rods (44). The slide (34) is fixedly connected to a first wire rope (51) and a second wire rope (52) on both sides. One end of the first wire rope (51) is fixedly connected to the corresponding side reel (48) and the rope body slides in contact with the top surface of the slide column (33). One end of the second wire rope (52) is fixedly connected to the other side reel (48) and the rope body slides in contact with the top surface of the slide column (33) while passing through the gap between the two rows of slide columns (33).

2. The visual guidance-assisted positioning device for precise positioning of radiotherapy patients according to claim 1, characterized in that: The first inner groove (32) is rotatably connected to the first positioning pulley (49) and the second positioning pulley (50) through bearings. The rope body of the second wire rope (52) rolls and fits in close contact with the first positioning pulley (49) and the second positioning pulley (50).

3. The visual guidance-assisted positioning device for precise positioning of radiotherapy patients according to claim 1, characterized in that: The auxiliary positioning mechanism includes a second inner groove (38) opened inside the annular plate (5), the second inner groove (38) and the first inner groove (32) being symmetrically distributed; two limiting slide plates (41) are fixedly installed inside the second inner groove (38), and the two limiting slide plates (41) are slidably fitted with a second annular inner toothed plate (39) and an annular outer toothed plate (40) from the outside to the inside; a rotating shaft (43) is rotatably connected inside the second inner groove (38) through a bearing, the end of the rotating shaft (43) extending to the outside of the annular plate (5) and rotatably connected to the bearing of the annular plate (5); a second gear (42) is fixedly fitted outside the rotating shaft (43), and the second gear (42) meshes with the second annular inner toothed plate (39) and the annular outer toothed plate (40) for transmission; The annular plate (5) has two side grooves (26) on its side, corresponding to the second annular inner toothed plate (39) and the annular outer toothed plate (40) respectively. The second annular inner toothed plate (39) and the annular outer toothed plate (40) are both fixedly provided with sliders. The sliders pass through the corresponding side grooves (26) and slide with the side grooves (26). The sliders on both sides are fixedly mounted with mounting plates (27). The mounting plates (27) are fixedly provided with positioning sleeves (36) on their outer sides. A fixing pad (6) is placed above the treatment bed (3). The fixing pad (6) is fixedly installed with insert rods (37) at both corners. The insert rods (37) are inserted into the positioning sleeves (36).

4. The visual guidance-assisted positioning device for precise positioning of radiotherapy patients according to claim 3, characterized in that: A square shell (46) is fixedly provided on the outer side of one of the annular plates (5), and the rotating shaft (43) on the corresponding side passes through the square shell (46) and is rotatably connected to the bearing of the square shell (46); a second bevel gear (56) is fixedly sleeved on the shaft body inside the square shell (46) of the rotating shaft (43); a third motor (47) is fixedly installed on the outer side of the square shell (46), and a second round rod (54) is fixedly connected to the output end of the third motor (47). The second round rod (54) extends into the inside of the square shell (46) and is rotatably connected to the bearing of the square shell (46); a first bevel gear (55) is fixedly provided at the end of the second round rod (54), and the first bevel gear (55) meshes with the second bevel gear (56) for transmission; A square rod (29) is fixedly connected to the end of the rotating shaft (43) equipped with the second bevel gear (56), and a rotating sleeve (28) is fixedly connected to the end of the other rotating shaft (43). The square rod (29) is slidably inserted into the rotating sleeve (28) to realize the synchronous rotation of the two rotating shafts (43).

5. The visual guidance-assisted positioning device for precise positioning of radiotherapy patients according to claim 1, characterized in that: The treatment bed (3) has two base plates (7) symmetrically arranged at the bottom. The base (13) is fixedly assembled on the same side of the two base plates (7). The end of the annular plate (5) is engaged and assembled inside the base (13).

6. The visual guidance-assisted positioning device for precise positioning of radiotherapy patients according to claim 5, characterized in that: Two base plates (7) are each fixedly provided with a side frame (23) on the side away from the base (13). Two limiting sliders (59) are symmetrically fixed on the inner side of the side frame (23). Limiting grooves (60) are opened on both sides of the annular plate (5). The limiting sliders (59) slide with the limiting grooves (60). A first annular internal toothed plate (17) is fixedly assembled on the inner ring surface of the annular plate (5). A housing (14) is fixedly provided on the outer side of the side frame (23). A fourth motor (53) is fixedly installed inside the housing (14). A transmission rod (30) is fixedly connected to the output end of the fourth motor (53). The transmission rod (30) passes through the side frame (23) and is rotatably connected to the bearing of the side frame (23). A first gear (31) is fixedly sleeved on the outside of the transmission rod (30). The first gear (31) meshes with the first annular internal toothed plate (17) for transmission.

7. The visual guidance-assisted positioning device for precise positioning of radiotherapy patients according to claim 6, characterized in that: One of the base plates (7) is fixedly fitted with a threaded block (22) on its top; the treatment bed (3) is fixedly provided with two fixed plates (8) at its bottom, and two slide rods (9) are symmetrically fixed between the two fixed plates (8); slide rod sleeves (24) are symmetrically fixed on both sides of the top of the two base plates (7), and the slide rods (9) pass through the corresponding slide rod sleeves (24) and slide in cooperation with the slide rod sleeves (24); a lead screw (58) is rotatably connected between the two fixed plates (8) through a bearing, and the lead screw (58) is threadedly connected to the threaded block (22); a fifth motor (57) is fixedly installed on the outside of one of the fixed plates (8), and the output end of the fifth motor (57) is fixedly connected to the lead screw (58).

8. The visual guidance-assisted positioning device for precise positioning of radiotherapy patients according to claim 7, characterized in that: One of the base plates (7) is equipped with a hand crank (11) on one side. A threaded rod (10) is fixedly connected to the inner side of the hand crank (11). The threaded rod (10) passes through one of the base plates (7) and is threadedly connected to the base plate (7). The end of the threaded rod (10) away from the hand crank (11) is rotatably connected to the bearing of the other base plate (7). Two sliding rods (12) are fixedly provided on one side of the other base plate (7). The sliding rods (12) pass through the corresponding base plate (7) and slide in cooperation with the base plate (7).

9. The visual guidance-assisted positioning device for precise positioning of radiotherapy patients according to claim 1, characterized in that: The treatment bed (3) has multiple support columns (4) fixedly installed at its bottom.

10. The visual guidance-assisted positioning device for precise positioning of radiotherapy patients according to claim 1, characterized in that: The controller (2) is fixedly installed on the side of the radiotherapy host body (1) away from the treatment bed (3).

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