Pelvic tumor radiotherapy device and use method thereof

Abstract

The invention provides a pelvic tumor radiotherapy device and a use method thereof, and relates to the technical field of medical instruments. The side fixing mechanisms are symmetrically arranged on the two sides of the bearing plate respectively, and each side fixing mechanism comprises a body side clamping plate, a body membrane fixing plate arranged at the lower end of the body side clamping plate in an up-down moving mode, an adjusting assembly, an L-shaped fixing plate and a sliding connecting assembly; the thigh fixing mechanism comprises a leg separating device, fixed clamping plates symmetrically arranged on the two sides of the leg separating device respectively and movable clamping plates slidably arranged on the two sides of the upper surface of the bearing plate respectively, and the fixed clamping plates and the movable clamping plates on the two sides of the leg separating device are oppositely arranged; and the genital organ protection mechanism is arranged at the upper end of the leg separating device. The body of a patient is fixed through joint cooperation of the positioning body film and the side fixing mechanism, the positioning body film is effectively prevented from loosening, and the fixing effect and the positioning accuracy are improved; by fixing the thighs, the accuracy and effect of radiotherapy are effectively improved; the risk that genitals are irradiated by radioactive rays is reduced, and safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a pelvic tumor radiotherapy device and a method of using the same. Background Art

[0002] Radiotherapy, also known as radiotherapy, is a local treatment method that uses radiation to treat tumors. An important task that must be done before radiotherapy is radiotherapy positioning, which is to find the location of the tumor through positioning, so as to determine the range of radiation. The main purpose of radiotherapy positioning is to ensure the accuracy of the irradiation site, maximize the efficacy, and reduce damage to normal tissues.

[0003] The traditional tumor radiotherapy fixation device is to form a body membrane on the patient's radiotherapy area separately, and shape it according to the patient's body shape and tumor location. Once the shaping is completed and cooled, the body membrane can fit tightly on the patient to fix the body position. In the process of radiotherapy for patients with pelvic tumors, the existing treatment positioning device still has the following defects: 1. It only relies on the positioning body membrane to fix the patient's body. When the positioning body membrane connection is loose, the patient can still drive the positioning body membrane to move or twist, and the fixation effect is not good; 2. The patient's pelvic position will move due to the movement of the legs, causing the irradiation position to shift, affecting the accuracy and effect of radiotherapy; 3. The vast majority of young male pelvic tumor patients have the need to retain reproductive function and reproduce offspring, but the existing fixation device does not have a genital protection structure, and requires additional metal shielding for protection, which is very inconvenient and easy to move, and the risk is relatively high.

[0004] In summary, there is an urgent need to design a pelvic tumor radiotherapy device and a method of using the device that overcomes the above-mentioned problems. Summary of the invention

[0005] The object of the present invention is to provide a pelvic tumor radiotherapy device and a method of using the device to overcome the above problems.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a pelvic tumor radiotherapy device, comprising:

[0007] A support board, which is used to support the patient's body;

[0008] Two side fixing mechanisms are symmetrically arranged on both sides of the supporting plate, and the side fixing mechanisms include a body side splint, a body membrane fixing plate arranged at the lower end of the body side splint and movable up and down, an adjustment component arranged on the body side splint and used to adjust the upper and lower positions of the body membrane fixing plate, an L-shaped fixing plate connected to the side wall of the supporting plate, and a sliding connection component used to slide the body side splint and the L-shaped fixing plate left and right;

[0009] A thigh fixing mechanism, comprising a leg separator, fixed splints symmetrically arranged on both sides of the leg separator, and movable splints slidably arranged on both sides of the upper surface of the support plate, wherein the fixed splints and movable splints on both sides of the leg separator are arranged opposite to each other to form a clamping member for clamping the legs;

[0010] The genitals protection mechanism is arranged at the upper end of the leg separator.

[0011] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0012] Furthermore, first slide grooves are respectively provided on both sides of the upper surface of the supporting plate, a first sliding block is slidably provided in the first slide groove, and the upper end of the first sliding block is fixedly connected to the movable clamping plate;

[0013] Supports are provided on both sides of the lower end of the supporting plate, and a first lead screw is rotatably connected between the two supports. Both ends of the outer wall of the first lead screw are threadedly connected with first lead screw nuts, and the upper ends of the first lead screw nuts are fixedly connected to the first sliding block through first connecting blocks. The thread directions of the two ends of the first lead screw are opposite, and one end of the first lead screw passes through the support and is fixedly connected with a first handle.

[0014] Furthermore, a second slide groove is provided in the middle of the upper surface of the leg separator, a second slider is slidably provided in the second slide groove, a vertical plate is fixedly provided on the upper end of the second slider, a third slide groove is provided on a side surface of the vertical plate close to the genital protection mechanism, a third slider is slidably provided in the third slide groove, and an outer end of the third slider is connected to the genital protection mechanism;

[0015] The vertical plate is provided with a limit assembly for limiting the sliding of the third slider in the third sliding groove, and the leg separator is provided with a control assembly for controlling the sliding of the second slider in the second sliding groove.

[0016] Further, the limit assembly includes a receiving groove opened in the vertical plate on one side of the third slide groove and connected to the third slide groove, a rack slidably arranged in the receiving groove, a plurality of return springs fixed between the rack and the side wall of the receiving groove, and a shifting block slidably arranged on the outer side wall of the vertical plate, and the inner end of the shifting block is fixedly connected to the rack;

[0017] A tooth meshing with the rack is provided on one side of the third sliding block close to the accommodating groove, and a clearance groove for the movement of the shifting block is provided on the outer side wall of the vertical plate.

[0018] Furthermore, the control component includes a second screw rotatably arranged in the second slide groove and parallel to the second slide groove, the outer wall of the second screw is connected to the second slider through a thread, and the end of the second screw away from the genital protection mechanism passes through the leg separator and is fixedly connected to the second handle.

[0019] Furthermore, a second connecting block is fixedly connected to one side of the third slider close to the genital protection mechanism, a connecting groove is provided on the upper surface of the second connecting block, a connecting rod is rotatably connected in the connecting groove via a rotating shaft, an end of the connecting rod is fixedly connected to the genital protection mechanism, and a torque spring is provided on the rotating shaft.

[0020] Furthermore, the genital protection mechanism includes a protective cover protruding upward and a baffle plate arranged on a side of the protective cover close to the vertical plate and extending downward.

[0021] Furthermore, the adjustment assembly includes a first fixed block and multiple second fixed blocks fixed on the outer side wall of the body side splint, a first adjustment screw threadedly connected to the first fixed block, and a first sliding rod slidably passed through the second fixed block, the lower ends of the first sliding rod and the first adjusting screw are respectively rotatably connected to the upper end of the body membrane fixing plate, the upper end of the first adjusting screw is fixed with a third handle, and the upper end of the first sliding rod is provided with a first limit block.

[0022] Furthermore, the sliding connection assembly includes a second adjusting screw threadedly connected to the L-shaped fixing plate and a second sliding rod slidably inserted on the L-shaped fixing plate, the inner ends of the second adjusting screw and the second sliding rod are respectively rotatably connected to the outer side walls of the body side splint, the outer end of the second adjusting screw is provided with a fourth handle, and the outer end of the second sliding rod is provided with a first limit block.

[0023] A method for using a pelvic tumor radiotherapy device comprises the following steps:

[0024] S1. The patient lies supinely on the support board with his legs spread apart on both sides of the leg separator, and his legs are placed between each set of fixed splints and movable splints respectively;

[0025] S2, the positioning body membrane is covered on the patient's pelvic area according to the positioning mark, and the side splints are moved to the two sides of the positioning body membrane respectively through the control of the sliding connection component on the side fixing mechanism, and the side splints clamp and fix the two sides of the positioning body membrane, and then the body membrane fixing plate is moved toward one end of the side splint through the adjustment component, and the two side edges of the positioning body membrane are fixed by the body membrane fixing plate and the side splints;

[0026] S3. Fix the patient's legs by adjusting the positions of the movable splint and the fixed splint;

[0027] S4. Cover the patient's genital area with the genital protection device.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The pelvic tumor radiotherapy device of the present invention has side fixing mechanisms composed of side body splints, body membrane fixing plates, adjustment components and sliding connection components arranged on both sides of the support plate. The two sides of the positioning body membrane can be clamped by the two side body splints, and the edges of the positioning body membrane can be clamped and fixed by the gap between the body membrane fixing plate and the side body splints. The patient's body is fixed by the positioning body membrane and the side fixing mechanism, which effectively avoids loosening of the connection of the positioning body membrane and improves the fixing effect and positioning accuracy.

[0030] 2. The pelvic tumor radiotherapy device of the present invention can position the patient's body by providing a thigh fixing mechanism composed of a leg separator, a fixed splint and a movable splint, so that the patient's legs can be naturally separated by the leg separator, and the patient's thighs can be fixed by two sets of fixed splints and a movable splint, which can effectively prevent the patient's thigh movement from causing movement of the pelvic position and avoid displacement of the irradiation position, thereby effectively improving the accuracy and effect of radiotherapy.

[0031] 3. The pelvic tumor radiotherapy device of the present invention can protect the patient's genitals during radiotherapy by arranging a genital protection mechanism at the upper end of the leg separator, so that the patient's genitals are not exposed to or are less exposed to radiation, thereby meeting the needs of male pelvic tumor patients to retain reproductive function and reproduce offspring. It is easy to use and has high reliability, effectively reducing the risk of genitals being exposed to radiation, and improving the safety of male patients during radiotherapy.

[0032] 4. The pelvic tumor radiotherapy device of the present invention has adjustable positions of the side fixing mechanism, thigh fixing mechanism and genital protection mechanism, and is suitable for patients of different body shapes. It is highly practical and worthy of promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the pelvic tumor radiotherapy device provided by the present invention;

[0034] Figure 2 It is a schematic cross-sectional structure diagram of a pelvic tumor radiotherapy device provided by the present invention;

[0035] Figure 3 is a schematic diagram of the cross-sectional structure of the vertical plate in an embodiment of the present invention;

[0036] Figure 4 is a schematic cross-sectional view of the connection between the genital protection mechanism, the vertical plate and the leg separator in an embodiment of the present invention;

[0037] Figure 5 yes Figure 1 The enlarged schematic diagram of point A in the middle;

[0038] Description of reference numerals:

[0039] 1. Support plate; 11. First slide groove; 12. First slide block; 13. Support; 14. First lead screw; 15. First lead screw nut; 16. First connecting block; 17. First handle;

[0040] 2. Side fixing mechanism; 21. Side splint; 22. Body membrane fixing plate; 23. Adjustment assembly; 231. First fixing block; 232. First adjusting screw; 233. First slide bar; 234. Third handle; 235. First limit block; 236. Second fixing block; 24. L-shaped fixing plate; 25. Sliding connection assembly; 251. Second adjusting screw; 252. Second slide bar; 253. Fourth handle; 254. First limit block; 26. Scale line;

[0041] 3. Thigh fixing mechanism; 31. Leg separator; 311. Second slide; 312. Second slider; 313. Vertical plate; 314. Third slide; 315. Third slider; 316. Giving way slot; 32. Fixed splint; 33. Movable splint;

[0042] 4. Genital protection mechanism; 41. Second connecting block; 42. Connecting groove; 43. Rotating shaft; 44. Connecting rod; 45. Torque spring; 46. Protective cover; 47. Baffle;

[0043] 5. Limiting assembly; 51. Accommodating groove; 52. Rack; 53. Return spring; 54. Shifting block;

[0044] 6. Control assembly; 61. Second lead screw; 62. Second handle. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The descriptions of directions such as "left", "right", "front", "back", "up" and "down" involved in the following are all defined relative to the accompanying drawings and do not represent the actual use direction of the winder.

[0046] See also Figures 1 to 5 , a pelvic tumor radiotherapy device, comprising:

[0047] A support board 1 is used to support the patient's body; the patient can lie on the support board 1;

[0048] The side fixing mechanism 2 is two and symmetrically arranged on both sides of the support plate 1, and the side fixing mechanism 2 includes a body side splint 21, a body membrane fixing plate 22 arranged at the lower end of the body side splint 21 and movable up and down, an adjustment component 23 arranged on the body side splint 21 and used to adjust the upper and lower positions of the body membrane fixing plate 22, an L-shaped fixing plate 24 connected to the side wall of the support plate 1, and a sliding connection component 25 for slidingly connecting the body side splint 21 with the L-shaped fixing plate 24 left and right; the adjustment component 23 can adjust the upper and lower positions of the body membrane fixing plate 22 , that is, adjusting the distance between the body membrane fixing plate 22 and the lower end of the side splint 21, so as to facilitate clamping and fixing the two side edges of the positioning body membrane; the sliding connection component 25 can adjust the distance between the side splint 21 and the L-shaped fixing plate 24, so that the side splint 21 moves along the width direction (left and right direction) of the support plate 1, so as to facilitate the two side splints 21 to be clamped on both sides of the positioning body membrane (not shown in the figure), that is, the positioning body membrane covers the patient's pelvic area, and then the two side splints 21 are directly clamped on both sides of the positioning body membrane to clamp and fix the patient's body and the positioning body membrane. The upper surface of the side splint 21 is also provided with a scale line 26, which is convenient for the doctor to record and repeat the body position through the scale line 26 and the mark on the patient's body, thereby improving the accuracy of the targeted treatment process.

[0049] The thigh fixing mechanism 3 includes a leg separator 31, fixed splints 32 symmetrically arranged on both sides of the leg separator 31, and movable splints 33 slidably arranged on both sides of the upper surface of the support plate 1. The fixed splints 32 and the movable splints 33 on both sides of the leg separator 31 are relatively arranged to form a clamping member for clamping the legs; the movable splint 33 can slide relative to the fixed splint 32, so that the thigh clamping member can clamp and fix the legs of patients of different body shapes, thereby improving the clamping effect and effectively preventing the patient's thigh movement from causing movement of the pelvic position.

[0050] The genital protection mechanism 4 is arranged at the upper end of the leg separator 31. The genital protection mechanism 4 can protect the patient's genitals during radiotherapy, so that the genitals are not exposed to or are less exposed to radiation, thereby meeting the needs of male pelvic tumor patients to retain reproductive function and reproduce offspring.

[0051] Preferably, first slide grooves 11 are respectively provided on both sides of the upper surface of the supporting plate 1, and a first slider 12 is slidably provided in the first slide groove 11, and the upper end of the first slider 12 is fixedly connected to the movable clamping plate 33;

[0052] Supports 13 are provided on both sides of the lower end of the support plate 1, and a first lead screw 14 is rotatably connected between the two supports 13. The first lead screw nuts 15 are respectively threadedly connected to the outer walls of the first lead screw 14 at both ends, and the upper ends of the first lead screw nuts 15 are respectively fixedly connected to the first slider 12 through first connecting blocks 16. The threads at both ends of the first lead screw 14 are in opposite directions, and one end of the first lead screw 14 passes through the support 13 and is fixedly connected to a first handle 17. In this embodiment, the first lead screw nuts 15 at both ends can drive the two first sliders 12 to move toward or away from each other by screwing the first handle 17, so that the patient's legs are fixedly clamped or detached at the same time, which is more convenient to operate and saves operation steps and time.

[0053] Preferably, a second slide groove 311 is provided in the middle of the upper surface of the leg spreader 31, a second slider 312 is slidably provided in the second slide groove 311, a vertical plate 313 is fixedly provided on the upper end of the second slider 312, a third slide groove 314 is provided on the side surface of the vertical plate 313 close to the genital protection mechanism 4, a third slider 315 is slidably provided in the third slide groove 314, and the outer end of the third slider 315 is connected to the genital protection mechanism 4;

[0054] The vertical plate 313 is provided with a limiter assembly 5 for limiting the sliding movement of the third slider 315 in the third slide groove 314, and the leg separator 31 is provided with a control assembly 6 for controlling the sliding movement of the second slider 312 in the second slide groove 311. In this embodiment, the position of the genital protection mechanism 4 in the longitudinal direction of the human body can be adjusted by the control assembly 6, and the position of the genital protection mechanism 4 above the human body can be adjusted by the limiter assembly 5, so that the position of the genital protection mechanism 4 can meet the needs of patients with different body shapes, thereby improving the practicality of this structure.

[0055] Preferably, the limiting assembly 5 includes a receiving groove 51 opened in the vertical plate 313 on one side of the third sliding groove 314 and connected to the third sliding groove 314, a rack 52 slidably arranged in the receiving groove 51, a plurality of return springs 53 fixed between the rack 52 and the side wall of the receiving groove 51, and a shifting block 54 slidably arranged on the outer side wall of the vertical plate 313, the inner end of the shifting block 54 is fixedly connected to the rack 52; the teeth on the rack 52 are arranged on a side close to the third sliding block 315, and no matter where the third sliding block 315 slides to in the third sliding groove 314, the teeth on the rack 52 are always meshed with the teeth on the third sliding block 315 under the action of the return spring 53, unless an external force is applied to the shifting block 54 to overcome the resilience of the return spring 53, the teeth on the rack 52 can be disengaged from the teeth on the third sliding block 315;

[0056] The third sliding block 315 is provided with teeth meshing with the rack 52 on one side close to the receiving groove 51 , and a clearance groove 316 for the movement of the shifting block 54 is provided on the outer side wall of the vertical plate 313 .

[0057] Preferably, the control component 6 includes a second screw 61 rotatably arranged in the second slide groove 311 and parallel to the second slide groove 311, the outer wall of the second screw 61 is connected to the second slider 312 through a thread, and the end of the second screw 61 away from the genital protection mechanism 4 passes through the leg separator 31 and is fixedly connected to the second handle 62.

[0058] Preferably, the third slider 315 is fixedly connected to a second connection block 41 on one side close to the genital protection mechanism 4, a connection groove 42 is provided on the upper surface of the second connection block 41, a connecting rod 44 is rotatably connected to the connecting groove 42 via a rotating shaft 43, an end of the connecting rod 44 is fixedly connected to the genital protection mechanism 4, and a torque spring 45 is provided on the rotating shaft 43. The torque spring 45 can make the genital protection mechanism 4 always fit the human body, thereby improving the protection effect.

[0059] Preferably, the genital protection mechanism 4 includes an upwardly protruding protective cover 46 and a baffle 47 arranged on the side of the protective cover 46 close to the vertical plate 313 and extending downward. The baffle 47 is used to better cover the crotch, and the protective cover 46 and the baffle 47 are both made of metal lead.

[0060] Preferably, the adjustment assembly 23 includes a first fixing block 231 and a plurality of second fixing blocks 236 fixed on the outer side wall of the body side splint 21, a first adjusting screw 232 threadedly connected to the first fixing block 231, and a first sliding bar 233 slidably penetrated through the second fixing block 236, the lower ends of the first sliding bar 233 and the first adjusting screw 232 are respectively rotatably connected to the upper end of the body membrane fixing plate 22, the upper end of the first adjusting screw 232 is fixedly provided with a third handle 234, and the upper end of the first sliding bar 233 is provided with a first limiting block 235. In this embodiment, the provision of the first sliding bar 233 can improve the stability of the connection between the body membrane fixing plate 22 and the body side splint 21; by screwing the third handle 234, the first adjusting screw 232 is driven to rotate, thereby prompting the body membrane fixing plate 22 to move upward or downward, playing the role of adjusting the distance between the body membrane fixing plate 22 and the body side splint 21, and facilitating the clamping of the side edge of the positioning body membrane.

[0061] Preferably, the sliding connection assembly 25 comprises a second adjusting screw 251 threadedly connected to the L-shaped fixing plate 24 and a second sliding bar 252 slidably inserted on the L-shaped fixing plate 24, the inner ends of the second adjusting screw 251 and the second sliding bar 252 are respectively rotatably connected to the outer side wall of the body side splint 21, the outer end of the second adjusting screw 251 is provided with a fourth handle 253, and the outer end of the second sliding bar 252 is provided with a first limit block 254. In this embodiment, the provision of the second sliding bar 252 can improve the stability of the connection between the body side splint 21 and the L-shaped fixing plate 24; by screwing the fourth handle 253, the second adjusting screw 251 is driven to rotate, thereby prompting the body side splint 21 to move toward or away from the L-shaped fixing plate 24, which plays a role in adjusting the distance between the body side splints 21 on both sides, so as to facilitate the clamping of the side wall of the positioning body membrane and the two sides of the patient's body.

[0062] A method for using a pelvic tumor radiotherapy device comprises the following steps:

[0063] S1, the patient lies supinely on the support board 1, with the legs spread apart and located on both sides of the leg separator 31, and the legs are placed between each set of fixed splints 32 and movable splints 33;

[0064] S2, the positioning body membrane is covered on the patient's pelvic area according to the positioning mark, and the side splints 21 are moved to the two sides of the positioning body membrane respectively through the control of the sliding connection component 25 on the side fixing mechanism 2, and the side splints 21 clamp and fix the two sides of the positioning body membrane, and then the body membrane fixing plate 22 is moved toward one end of the side splint 21 through the adjustment component 23, and the two side edges of the positioning body membrane are fixed by the body membrane fixing plate 22 and the side splints 21;

[0065] S3, fixing the patient's legs by adjusting the positions of the movable splint 33 and the fixed splint 32;

[0066] S4. Cover the genital area of ​​the patient with the genital protection mechanism 4.

[0067] The present invention is further described above in conjunction with the embodiments, but the present invention is not limited to the above-mentioned implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A pelvic tumor radiotherapy device, characterized in that: It includes: A support plate (1) for supporting the patient's body; Two side fixing mechanisms (2) are symmetrically arranged on both sides of the support plate (1), and the side fixing mechanisms (2) include a body side splint (21), a body membrane fixing plate (22) arranged at the lower end of the body side splint (21) and movable up and down, an adjustment component (23) arranged on the body side splint (21) and used to adjust the upper and lower positions of the body membrane fixing plate (22), an L-shaped fixing plate (24) connected to the side wall of the support plate (1), and a sliding connection component (25) used to slide the body side splint (21) and the L-shaped fixing plate (24) left and right; A thigh fixing mechanism (3), comprising a leg separator (31), fixed clamping plates (32) symmetrically arranged on both sides of the leg separator (31), and movable clamping plates (33) slidably arranged on both sides of the upper surface of the support plate (1), wherein the fixed clamping plates (32) and the movable clamping plates (33) on both sides of the leg separator (31) are arranged relative to each other to form a clamping member for clamping the legs; The genital protection mechanism (4) is arranged at the upper end of the leg separator (31).

2. The pelvic tumor radiotherapy device according to claim 1, characterized in that: First slide grooves (11) are respectively provided on both sides of the upper surface of the supporting plate (1), a first sliding block (12) is slidably provided in the first sliding groove (11), and the upper end of the first sliding block (12) is fixedly connected to the movable clamping plate (33); Supports (13) are provided on both sides of the lower end of the support plate (1), a first lead screw (14) is rotatably connected between the two supports (13), both ends of the outer wall of the first lead screw (14) are respectively threadedly connected with first lead screw nuts (15), the upper ends of the first lead screw nuts (15) are respectively fixedly connected to the first sliding block (12) through first connecting blocks (16), the threads at both ends of the first lead screw (14) are in opposite directions, one end of the first lead screw (14) passes through the support (13) and is fixedly connected with a first handle (17).

3. The pelvic tumor radiotherapy device according to claim 1, characterized in that: A second slide groove (311) is provided in the middle of the upper surface of the leg separator (31), a second slider (312) is slidably provided in the second slide groove (311), a vertical plate (313) is fixedly provided at the upper end of the second slider (312), a third slide groove (314) is provided on the side surface of the vertical plate (313) close to the genital protection mechanism (4), a third slider (315) is slidably provided in the third slide groove (314), and the outer end of the third slider (315) is connected to the genital protection mechanism (4); The vertical plate (313) is provided with a limit assembly (5) for limiting the sliding of the third slider (315) in the third slide groove (314), and the leg separator (31) is provided with a control assembly (6) for controlling the sliding of the second slider (312) in the second slide groove (311).

4. The pelvic tumor radiotherapy device according to claim 3, characterized in that: The limiting assembly (5) comprises a receiving groove (51) provided in the vertical plate (313) on one side of the third sliding groove (314) and connected to the third sliding groove (314), a rack (52) slidably arranged in the receiving groove (51), a plurality of return springs (53) fixed between the rack (52) and the side wall of the receiving groove (51), and a shifting block (54) slidably arranged on the outer side wall of the vertical plate (313), wherein the inner end of the shifting block (54) is fixedly connected to the rack (52); The third sliding block (315) is provided with teeth meshing with the rack (52) on one side close to the receiving groove (51), and a clearance groove (316) for the movement of the shifting block (54) is provided on the outer side wall of the vertical plate (313).

5. The pelvic tumor radiotherapy device according to claim 3, characterized in that: The control assembly (6) comprises a second lead screw (61) rotatably arranged in the second slide groove (311) and parallel to the second slide groove (311); the outer wall of the second lead screw (61) is connected to the second slider (312) through a thread; one end of the second lead screw (61) away from the genital protection mechanism (4) passes through the leg separator (31) and is fixedly connected to the second handle (62).

6. The pelvic tumor radiotherapy device according to any one of claims 3 to 5, characterized in that: The third slider (315) is fixedly connected to a second connecting block (41) on one side close to the genital protection mechanism (4); a connecting groove (42) is provided on the upper surface of the second connecting block (41); a connecting rod (44) is rotatably connected in the connecting groove (42) via a rotating shaft (43); an end of the connecting rod (44) is fixedly connected to the genital protection mechanism (4); and a torque spring (45) is provided on the rotating shaft (43).

7. The pelvic tumor radiotherapy device according to claim 1, characterized in that: The genital protection mechanism (4) comprises a protective cover (46) protruding upward and a baffle (47) arranged on one side of the protective cover (46) close to the vertical plate (313) and extending downward.

8. The pelvic tumor radiotherapy device according to claim 1, characterized in that: The adjustment component (23) comprises a first fixed block (231) and a plurality of second fixed blocks (236) fixed on the outer side wall of the body side splint (21), a first adjustment screw (232) threadedly connected to the first fixed block (231), and a first sliding rod (233) slidably passed through the second fixed block (236), the lower ends of the first sliding rod (233) and the first adjustment screw (232) are respectively rotatably connected to the upper end of the body membrane fixing plate (22), the upper end of the first adjustment screw (232) is fixedly provided with a third handle (234), and the upper end of the first sliding rod (233) is provided with a first limit block (235).

9. The pelvic tumor radiotherapy device according to claim 1, characterized in that: The sliding connection assembly (25) comprises a second adjusting screw (251) threadedly connected to the L-shaped fixing plate (24) and a second sliding rod (252) slidably inserted on the L-shaped fixing plate (24); the inner ends of the second adjusting screw (251) and the second sliding rod (252) are respectively rotatably connected to the outer side wall of the side splint (21); the outer end of the second adjusting screw (251) is provided with a fourth handle (253); and the outer end of the second sliding rod (252) is provided with a first limit block (254).

10. The method for using the pelvic tumor radiotherapy device according to claim 1, characterized in that: The following steps are involved: S1. The patient lies supinely on the support board (1), with the legs spread apart and positioned on both sides of the leg separator (31), and the legs are placed between each set of fixed splints (32) and movable splints (33); S2, the positioning body membrane is covered on the patient's pelvic area according to the positioning mark, and the side splints (21) are respectively moved to the two sides of the positioning body membrane through the control of the sliding connection component (25) on the side fixing mechanism (2), and the side splints (21) clamp and fix the two sides of the positioning body membrane, and then the body membrane fixing plate (22) is moved toward one end of the side splint (21) through the adjustment component (23), and the two side edges of the positioning body membrane are fixed together by the body membrane fixing plate (22) and the side splint (21); S3, fixing the patient's legs by adjusting the positions of the movable splint (33) and the fixed splint (32); S4. Cover the genital area of ​​the patient with the genital protection mechanism (4).

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