A mechanical device for implementing spatial fractionation radiotherapy

Abstract

The present invention relates to the technical field of radiotherapy equipment, and specifically provides a mechanical implementation device for spatially divided radiotherapy, comprising a linear accelerator arranged on a frame, a beam mechanism being arranged at the head of the linear accelerator, and high-energy rays generated by the linear accelerator being output from the beam mechanism, the beam mechanism comprising a first baffle layer, the first baffle layer being composed of a plurality of first baffle portions arranged in parallel, a single first baffle portion comprising a first long baffle and a first telescopic unit for controlling the first long baffle to move in the length direction of the first long baffle, and lattice holes being arranged on the first long baffle; the long baffle of the present invention has lattice holes, and hot spots correspond to the lattice holes one by one, and a single hot spot only needs to control the movement of the corresponding long baffle in one direction, and does not require support from complex algorithms and complex driving structures, so there is a shorter reaction time and a faster adjustment rate to changes in the hot spot position, and the adjustment of the entire mechanism is more efficient and convenient, which can greatly shorten the radiotherapy time.

Description

Technical Field

[0001] The present invention relates to the technical field of radiotherapy equipment, and specifically provides a mechanical device for implementing spatially divided radiotherapy. Background Art

[0002] In current medical treatment, 2 / 3 of malignant tumor patients will use radiotherapy during treatment. For the current concept of radiotherapy, it is necessary to cover all tumors with full doses. Therefore, most of the current radiotherapy equipment platforms are linear accelerators. Linear accelerators produce high-energy rays by accelerating electrons to "target". In order to accurately achieve the effect of treating tumors and adapt to the shape of tumors, a multi-leaf collimator (MLC) is set at the head position of the modern linear accelerator. The multi-leaf grating is set at the head position of the linear accelerator and used as a collimator. The multi-leaf grating is composed of several pairs of 0.5~1cm lead gates, and each grating lead gate of the multi-leaf grating is driven by a driving mechanism. Through the movement of these lead gates, the shape of the tumor is formed, and at the same time, the frame rotates around the patient, so that the output radiation beam fully covers the tumor position 360°, so as to achieve better dose conformity and volumetric rotation intensity modulated radiotherapy.

[0003] However, under the current technical implementation conditions, achieving full coverage of the tumor will cause the surrounding scattered dose and the dose of the incident area on the body surface to become uncontrollable, leading to serious complications. Clinical observations show that more than 50% of patients have systemic radiotherapy side effects, and more than 95% of patients have radiation-induced skin side effects. Therefore, although full coverage radiotherapy can ensure complete irradiation of the tumor, it will also irradiate the surrounding normal tissues. For this reason, in order to ensure the same radiotherapy effect with fewer side effects, relevant research institutions have proposed "space-fractionated radiotherapy". The main concept of "space-fractionated radiotherapy" is to convert the dose coverage of the entire tumor into several "hot spot" dose coverage. This method reduces the total energy of dose transmission, especially for the high-dose coverage area around the tumor, which can greatly reduce the side effects of radiotherapy. Clinical observations have found that this distributed dose coverage can also achieve better therapeutic effects.

[0004] After the existing radiotherapy equipment platform is used to spatially segment the tumor, when performing volumetric rotation intensity modulated radiotherapy, since the hot spots divided on the tumor are spatially distributed, these three-dimensional hot spots need to be layered for radiotherapy, and the positional relationship of the hot spots on the same level at different angles is also different. When using multiple pages of gratings to form hot spot holes, a hot spot needs to be coordinated with multiple gratings that are symmetrically set to change in real time. Due to the complex driving structure and bottlenecks such as algorithms, the multi-page grating cannot quickly change multiple hot spot holes according to the changes in the hot spots. Often, the hot spot irradiation of one level requires several rack rotations to complete effective radiotherapy irradiation. Therefore, although the existing equipment can complete the radiotherapy process of distributed dose coverage, it also greatly increases the entire radiotherapy time compared to the traditional conventional dose full coverage radiotherapy method. The longer the radiotherapy time, the greater the radiation damage to the patient. Therefore, how to use the existing radiotherapy equipment platform to quickly and efficiently perform radiotherapy on multiple hot spots is a problem encountered by current radiotherapy technology. Summary of the invention

[0005] The present invention aims to provide a device for use on an existing linear accelerator, which can achieve rapid and efficient radiotherapy of multiple hot spots after tumor division.

[0006] The technical solution of the present invention is as follows:

[0007] A mechanical implementation device for spatially fractionated radiotherapy comprises a frame and a linear accelerator arranged on the frame, a beam mechanism is arranged at the head position of the linear accelerator, and high-energy rays generated by the linear accelerator are output from the beam mechanism, the beam mechanism comprises a first baffle layer, the first baffle layer is composed of a plurality of first baffle portions arranged in parallel, a single first baffle portion comprises a first long baffle and a first telescopic unit for controlling the first long baffle to move in the length direction of the first long baffle, and lattice holes are arranged on the first long baffle.

[0008] In this scheme, the beam mechanism replaces the traditional multi-page grating, and the slender grating strips are formed into wider long baffles with lattice holes. The high-energy rays output by the linear accelerator are directly emitted from the lattice holes and are restricted by the lattice holes to become a hot spot beam of appropriate size. The high-energy ray beam emitted after adjusting the position of the lattice holes by the first telescopic unit can correspond to a hot spot on the target tumor, and multiple lattice holes can also be provided on the parallelly arranged baffles to correspond to multiple hot spots at the same time. Each long baffle changes according to the corresponding hot spot position, and the position of the corresponding hot spot beam can be adjusted by controlling the position of the lattice hole by the telescopic unit. Compared with the traditional multi-page grating, there is no need to control the size of the hot spot hole, and a hot spot hole is regulated by a telescopic unit. Only one row of first baffle parts is needed to correspond to a hot spot on a layer. Compared with the traditional multi-page grating, the structure is simpler. A single hot spot only needs to control the movement of the corresponding long baffle in one direction, and does not require the support of complex algorithms and complex driving structures. Therefore, there is a shorter reaction time and a faster adjustment rate to the change of the hot spot position. The adjustment of the entire mechanism is more efficient and convenient, which can greatly shorten the radiotherapy time.

[0009] Furthermore, a plurality of lattice holes with different diameters are arranged at intervals on the first long baffle plate, and lattice holes with different diameters can be selected according to the sizes of hot spots arranged for different patients. The telescopic condition of the long baffle plate can be adjusted by the first telescopic unit to thereby adjust the selected lattice holes to be within the light output range of the linear accelerator, thereby improving the adaptability of the entire device.

[0010] Preferably, two lattice holes are arranged at intervals on a single long baffle, one being a commonly used 10 mm lattice hole and the other being a 5 mm lattice hole.

[0011] Furthermore, different patients, tumor sizes, shapes, or selected layers will result in different projection distances of the hotspots selected on the layer on the plane perpendicular to the selected layer. Therefore, in order to further improve the adaptability and adjustment ability of the device, the first baffle part also includes a translation unit, which can control the movement of a single first long baffle in its width direction. The first long baffle is driven by the translation unit to adjust the spacing of the lattice holes between the first long baffles, so that the hot spot beams output by them can adapt to the hot spots on different layers.

[0012] Since the width of the long baffles is fixed, when each long baffle moves along the width direction, gaps will inevitably be generated, causing the high-energy rays output by the linear accelerator to hit the patient through the gaps, causing the irradiation dose during radiotherapy to be out of control. In order to avoid this situation, the beam mechanism also includes a second baffle layer, which is composed of a plurality of second baffle parts arranged in parallel, and the second baffle parts include a second long baffle and a second telescopic unit for controlling the extension and retraction of the second long baffle, and the extension direction of the second long baffle is the same as the extension direction of the first long baffle. In this scheme, the second baffle layer is located above the first baffle layer. When the first baffle layer adjusts the spacing between each first long baffle, gaps are generated between the first long baffles. The second baffle part at the gap position is extended and retracted by the second telescopic unit to block the gap between adjacent first long baffles, thereby preventing the high-energy rays output by the linear accelerator from hitting the patient through the gap. In addition, the second baffle layer does not need to control the extension and contraction degree of the first long baffle as the angle changes like the first baffle layer, and will not affect the speed at which the reaction speed device adapts to the change of the hot spot during rotational radiotherapy.

[0013] Preferably, the first telescopic unit includes a telescopic rod connected to a motor, and the telescopic rod is inserted in the first long baffle. Each first long baffle has a telescopic rod to control its extension and retraction. It only needs to ensure that the stepper motor connected to each telescopic rod can be regulated by the control system, so that the lattice holes on the first long baffle can be controlled to change in accordance with the position of the hot spot.

[0014] Preferably, the translation unit includes a sliding seat, the sliding seat is slidably arranged on the guide rod portion on one side of the light beam mechanism, and the telescopic rod is arranged on the sliding seat. The telescopic rod is integrated with the sliding seat, so that when the sliding seat moves along the guide rod portion, the telescopic rod is directly driven to move, which has a simple structure and convenient transmission.

[0015] Since the width of a single first long baffle should not be too wide, between 15mm and 20mm, adjacent first long baffles can slide against each other, so the sliding seats in adjacent first baffle parts are easy to interfere when the spacing between the first long baffles is the smallest. At the same time, in order to ensure that only the lattice holes can output high-energy rays, and the radiation of the high-energy rays output by the linear calculator will not leak through the first long baffle, the thickness of the first long baffle needs to be above 50mm, so the guide rod part includes a plurality of guide rods arranged in parallel on the same vertical plane, and the first telescopic units in the adjacent first baffle parts are arranged on different guide rods. Since the thickness of the long baffle is sufficient and the heights of different guide rods are different, the telescopic rods can be inserted into the long baffle from different heights, and the guide rods of different heights avoid interference between the sliding seats on adjacent first baffle plates through the height difference.

[0016] Preferably, the guide rod is a threaded screw rod, and the sliding seat is provided with a screw nut adapted to the threaded screw rod. The threaded screw rod has a better self-locking effect than the ordinary slide rail slide rod, and can provide the sliding seat with a finer displacement than the sliding structure formed by the gear rack.

[0017] For the hot spots that have been divided on the tumor, on the same level, the projection distance of each hot spot on the plane perpendicular to the level is generally equal. If the position of each first long baffle on the width is controlled one-to-one by the corresponding motor like the telescopic rod, the difficulty and cost of arranging the motor will increase, and the algorithm for controlling the movement of each baffle in the first baffle layer will also be very high. In order to respond to changes in the position of the hot spot, the first baffle layer can quickly and in real time adjust the position of each first long baffle to ensure the one-to-one correspondence between the lattice holes and the hot spots. To this end, the multiple guide rods of the guide rod part include a first active rod and a plurality of driven rods, and the end of the first active rod is provided with an active gear group connected to the motor transmission, and the end of the driven rod is provided with a driven gear meshing with the active gear group, and the transmission ratio between the driven gear on the driven rod and the active gear group increases successively.

[0018] By providing multiple driven rods that are transmission-connected to the first active rod, there is no need to separately provide a driving unit on each sliding seat to control its sliding along the width direction of the first long baffle. By rotating the first active rod, the driven rod can rotate a greater number of circles than the transmission ratio. When the thread pitches of each guide rod are the same, all the first long baffles arranged on the driven rods can be spread out at the same spacing.

[0019] When there are more first baffle parts on the first baffle layer, more guide rods are required, resulting in an increase in the number of driven guide rods. Since there is only one first active rod, each driven rod is transmitted through its own gear meshing, which will cause the transmission structure of the entire first baffle layer to be too complicated. In order to avoid the entire device structure becoming complicated and redundant, thread segments with different pitches are provided on the guide rod, and the sliding seats in different thread segments on a single guide rod will move different distances along its guide rod when the corresponding guide rod rotates.

[0020] Beneficial effects of the present invention:

[0021] The present invention replaces the traditional multi-page grating by arranging a beam mechanism at the end of the linear accelerator. Each first long baffle in the beam mechanism has a lattice hole. The regional high-energy rays output by the linear accelerator are limited by the lattice hole to a hot spot beam of suitable size. The high-energy ray beam emitted after adjusting the position of the lattice hole by the first telescopic unit can correspond to a hot spot on the target tumor, and multiple lattice holes can be provided on the baffles arranged in parallel to correspond to multiple hot spots at the same time. Each long baffle changes according to the corresponding hot spot position. The position of the corresponding hot spot beam can be adjusted by controlling the position of the lattice hole by the telescopic unit. Compared with the traditional multi-page grating, the size of the hot spot hole is additionally controlled, and the position of a hot spot hole is regulated by a telescopic unit. Only one row of first baffle parts is needed to correspond to a hot spot on a layer one by one. Compared with the traditional multi-page grating, the structure is simpler. A single hot spot only needs to control the movement of the corresponding long baffle in one direction, and does not need to be supported by complex algorithms and complex driving structures. Therefore, there is a shorter reaction time and a faster adjustment rate to the change of the hot spot position, and the adjustment of the entire mechanism is more efficient and convenient, which can greatly shorten the radiotherapy time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the present invention, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 is a schematic diagram of the light beam mechanism of the present invention;

[0024] Figure 2 It is a schematic diagram of the light beam mechanism of the present invention when it is working;

[0025] Figure 3 is a schematic diagram of a light beam mechanism in Embodiment 3 of the present invention;

[0026] Figure 4 It is a schematic diagram of the front view of the light beam mechanism of the present invention;

[0027] Figure 5 It is a schematic diagram of the operation of the light beam mechanism of the present invention when viewed from the front.

[0028] In the above drawings, the corresponding reference numerals are as follows:

[0029] 1-light emitting range, 2-light beam mechanism, 21-first baffle part, 211-first long baffle, 2111-lattice hole, 212-first telescopic unit, 2121-telescopic rod, 213-translation unit, 214-sliding seat, 215-guide rod, 2151-first active rod, 2152-second driven rod, 2153-third driven rod, 2154-active gear group, 2155-driven gear, 2156-A threaded segment, 2157-B threaded segment, 2158-A' threaded segment, 2159-B' threaded segment, 216-screw nut, 22-second baffle part, 221-second telescopic unit, 222-second long baffle, 23-constraint frame. DETAILED DESCRIPTION

[0030] In conjunction with the accompanying drawings, the technical solution of the present invention is clearly and completely described through the specific implementation methods of the embodiments of the present invention. Example 1

[0031] A mechanical device for realizing spatial fractionation radiotherapy comprises a frame and a linear accelerator arranged on the frame, wherein a beam mechanism 2 is arranged at the head position of the linear accelerator, and high-energy rays generated by the linear accelerator are output from the beam mechanism 2. Figure 1 As shown, the beam-beaming mechanism 2 includes a first baffle layer, which is composed of a plurality of first baffle portions 21 arranged in parallel, wherein the first baffle portions 21 are slidably arranged in a constraint frame 23, and a single first baffle portion 21 includes a first long baffle 211 and a first telescopic unit 212 for controlling the movement of the first long baffle 211 in the length direction of the first long baffle 211, and a lattice hole 2111 is arranged on the first long baffle 211.

[0032] Specifically, a plurality of lattice holes 2111 with different diameters are arranged at intervals on the first long baffle 211. Preferably, two lattice holes 2111 are arranged at intervals on a single long baffle, one of which is a commonly used 10 mm lattice hole 2111 and the other is a 5 mm lattice hole 2111. Lattice holes 2111 with different diameters are selected according to the size of hot spots arranged for different patients, and the telescopic condition of the long baffle is adjusted by the first telescopic unit 212 to adjust the selected lattice hole 2111 to be within the light output range 1 of the linear accelerator, thereby improving the adaptability of the entire device. The constraint frame 23 is a vertical rectangular ring frame, and the upper and lower surfaces of the first long baffle 211 are tightly attached to the upper and lower inner walls of the constraint frame 23, so that the first long baffle 211 can slide along the inner wall of the constraint frame 23 to prevent the first long baffle 211 from moving in the thickness direction.

[0033] In addition, the first telescopic unit 212 includes a telescopic rod 2121 that is connected to the motor, and the telescopic rod 2121 is inserted into the first long baffle 211. Each first long baffle 211 has a telescopic rod 2121 to control its extension and retraction. It only needs to ensure that the stepper motor connected to each telescopic rod 2121 can be controlled by the control system, so that the lattice holes 2111 on the first long baffle 211 can be controlled to change according to the position of the hot spot.

[0034] The telescopic rod 2121 can be a screw rod with threads that is connected to the stepper motor, and the insertion hole of the first long baffle 211 also has threads that match it. When the telescopic rod 2121 rotates, the first long baffle 211 will not rotate around the telescopic rod 2121 due to the limitation of the constraint frame 23, but will slide along the length direction of the telescopic rod 2121 by relying on the threaded connection; of course, the telescopic rod 2121 can also be a pneumatic telescopic rod 2121. The telescopic rod 2121 is preferably a screw rod with threads. At this time, it is necessary to ensure that the first long baffle 211 has enough telescopic space. However, since the width of a single first long baffle is limited, generally around 25mm, so if Figure 1 As shown, the smaller lattice hole 2111 is set near the first telescopic unit 212, and the lattice hole 2111 with a smaller diameter is set near the edge. While reducing the length of the first long baffle 211, the insertion hole of the first long baffle 211 corresponding to the telescopic rod 2121 can have sufficient depth, ensuring that the first long baffle 211 has sufficient telescopic distance.

[0035] In this embodiment, the traditional grating is replaced with a long baffle with lattice holes 2111. The high-energy rays output by the linear accelerator are directly emitted from the lattice holes 2111 and are limited by the lattice holes 2111 to be a hot spot beam of suitable size. The high-energy ray beam emitted after the position of the lattice holes 2111 is adjusted by the first telescopic unit 212 can correspond to a hot spot on the target tumor, and multiple lattice holes 2111 can be provided on the baffles arranged in parallel to correspond to multiple hot spots at the same time. Each long baffle changes according to the corresponding hot spot position, and the position of the lattice holes 2111 is controlled by the telescopic unit. The corresponding hot spot beam position can be adjusted. Compared with the traditional multi-page grating, there is no need to control the size of the hot spot hole, and the position of a hot spot hole is adjusted by a telescopic unit. Only a row of first baffle parts 21 is needed to correspond to the hot spots on one level. Compared with the traditional multi-page grating, the structure is simpler. A single hot spot only needs to control the movement of the corresponding long baffle in one direction. It does not require complex algorithms and complex driving structure support. Therefore, it has a shorter response time and a faster adjustment rate to the change of the hot spot position. The adjustment of the entire mechanism is more efficient and convenient, which can greatly shorten the radiotherapy time. Example 2

[0036] Different tumors have different sizes and shapes, so the hot spots of each tumor are almost unique. The different distribution of hot spots leads to different projection distances of the hot spots selected on the tumor level on the plane perpendicular to the selected level. Therefore, in order to further improve the adaptability and adjustment ability of the device, such as Figures 1 to 3 As shown, the first baffle portion 21 also includes a translation unit 213, which can control the movement of a single first long baffle 211 in its width direction. The first long baffle 211 is driven by the translation unit 213 to adjust the spacing of the lattice holes 2111 between the first long baffles 211 so that the hot spot beams outputted therefrom can adapt to hot spots on different levels.

[0037] Specifically, Figure 4 and Figure 5 As shown, the arrow represents the output direction of the high-energy rays in the linear accelerator, and the translation unit 213 includes a sliding seat 214, and the sliding seat 214 is slidably arranged on the guide rod 215 on one side of the beam mechanism 2, and the telescopic rod 2121 is arranged on the sliding seat 214. The telescopic rod 2121 is integrated with the sliding seat 214, so that when the sliding seat 214 moves along the guide rod 215, the telescopic rod 2121 is directly driven to move, and the structure is simple and the transmission is convenient. Since the width of a single first long baffle 211 should not be too wide, between 15mm and 20mm, adjacent first long baffles 211 can slide against each other, so the sliding seats 214 in adjacent first baffle parts 21 are easy to interfere when the spacing between the first long baffles 211 is the smallest. At the same time, in order to ensure that only the lattice holes 2111 can output high-energy rays, and the radiation of the high-energy rays output by the linear accelerator will not leak through the first long baffle 211, the thickness of the first long baffle 211 needs to be more than 50 mm, so the guide rod 215 part includes a plurality of guide rods 215 arranged in parallel on the same vertical plane, and the first telescopic units 212 in the adjacent first baffle parts 21 are arranged on different guide rods 215. Since the thickness of the long baffle is sufficient and the heights of different guide rods 215 are different, the telescopic rod 2121 can be inserted into the long baffle from different heights, and the guide rods 215 of different heights avoid interference between the sliding seats 214 on the adjacent first baffle plates through the height difference.

[0038] The guide rod 215 is a threaded screw rod, and a screw nut 216 adapted to the threaded screw rod is provided on the sliding seat 214. The guide rod 215 is perpendicular to the telescopic rod 2121. The motor drives the guide rod 215 to rotate. Due to the limit of the constraint frame 23, the first baffle unit provided on the sliding seat 214 will not rotate with the rotation of the guide rod 215, but is driven by the screw nut 216 to move along the length direction of the guide rod 215. The threaded screw rod has a better self-locking effect than the ordinary slide rail slide rod, and the sliding structure formed by the gear rack can provide the sliding seat 214 with a more precise displacement.

[0039] Furthermore, for the hot spots divided on the tumor, on the same level, the projection distance of each hot spot on the plane perpendicular to the level is generally equal. If the position of each first long baffle 211 in width is controlled one-to-one by the corresponding motor like the telescopic rod 2121, the difficulty and cost of arranging the motor will increase, and the algorithm for controlling the movement of each baffle of the first baffle layer will also be very high. In order to enable the first baffle layer to quickly adjust the position of each first long baffle 211 when the position of the hot spot changes, and ensure the one-to-one correspondence between the lattice holes 2111 and the hot spot, a simpler transmission structure is provided.

[0040] The multiple guide rods 215 of the guide rod 215 part include a first active rod 2151 and a plurality of driven rods, the end of the first active rod 2151 is provided with an active gear group 2154 connected to the motor transmission, the end of the driven rod is provided with a driven gear 2155 meshing with the active gear group 2154, the transmission ratio between the driven gear 2155 on the driven rod and the active gear group 2154 increases successively, preferably increases at a natural number multiple, such as the transmission ratio between the driven gear 2155 on the driven rod closest to the active rod and the active gear group 2154 is 2, the transmission ratio between the driven gear 2155 on the driven rod second closest to the active rod and the active gear group 2154 is 3, the transmission ratio between the driven gear 2155 on the driven rod third closest to the active rod and the active gear group 2154 is 4... and so on. By providing multiple driven rods that are transmission-connected to the first active rod 2151, there is no need to separately provide a driving unit on each sliding seat 214 to control its sliding along the width direction of the first long baffle 211. That is, only one motor is needed to drive and control the first active rod 2151 to rotate a suitable number of circles. The different transmission ratios between the driven rods and the active rod can be utilized to allow the driven rods to rotate different numbers of circles according to the transmission ratio. When the thread pitches of the guide rods 215 are the same, all the first long baffles 211 arranged on the driven rods can be spread out at the same spacing.

[0041] It should be noted that, with the first baffle portion 21 arranged on the first active rod 2151 as a reference, no thread is arranged at the connection between the sliding seat 214 on the first baffle portion 21 as a reference and the first active rod 2151, that is, when the first active rod 2151 rotates, the first baffle portion 21 serving as a reference does not move along the width direction of the first long baffle 211, and the first baffle portions 21 adjacent to the first baffle portion 21 as the reference are sequentially arranged on driven rods with increasing transmission ratios, so that when the first active rod 2151 rotates, the spacing changes between the first baffle portions 21 are the same.

[0042] However, when there are more first baffle portions 21 on the first baffle layer, more guide rods 215 are required, resulting in an increase in the number of driven guide rods 215. Since there is only one first active rod 2151, each driven rod is transmitted through its own gear meshing, which will cause the transmission structure of the entire first baffle layer to be too complicated. In order to avoid the entire device structure becoming complicated and redundant, further, thread segments with different pitches are provided on the guide rod 215, and the sliding seats 214 on different thread segments on a single guide rod 215 will move different distances when the corresponding guide rod 215 rotates.

[0043] Since the number of hot spots on one level is generally 1 to 8, the number of first baffle portions 21 provided in the first baffle layer should not be too large. Therefore, preferably, three guide rods 215 are provided. Figure 4 As shown, it includes a first active rod 2151 and two driven rods, and the driven rods include a second driven rod 2152 and a third driven rod 2153. The second driven rod 2152 and the third driven rod 2153 are respectively arranged above and below the first active rod 2151, and the rotation ratio between the first active rod 2151, the second driven rod 2152 and the third driven rod 2153 is 1:2:3. The second driven rod 2152 is provided with two thread segments A and B, and the two thread segments A and B are symmetrically arranged on both sides of the second driven rod 2152, with the A thread segment 2156 on the inner side and the B thread segment 2157 on the outer side. The third driven rod 2153 has A' thread segments 2158 symmetrically arranged at both ends, and the first active rod 2151 has B' thread segments 2159 symmetrically arranged at both ends.

[0044] Taking the middle part of the first active rod 2151 as a reference, the first baffle portion 21 serving as a reference does not move on the first active rod 2151, and the two first baffle portions 21 adjacent to the first baffle portion 21 serving as a reference are arranged on the A thread segment 2156, and the thread segment length of the A thread segment 2156 is the width of three first long baffles 211. That is, the motor drives the first active rod 2151 to rotate one circle, and the first baffle portion 21 with the center as the reference does not move, and the adjacent first baffle portion 21 arranged on the A thread segment 2156 of the second driven rod 2152 moves symmetrically by a length of x, and then the first baffle portion 21 immediately arranged on the A' thread segment 2158 of the third driven rod 2153 moves symmetrically by a length of 2x at the same time, and then the first baffle portion 21 immediately arranged on the B' thread segment 2159 of the first active rod 2151 moves by a length of 3x at the same time, and finally the first baffle portion 21 arranged on the B thread segment 2157 of the second driven rod 2152 moves by a length of 4x, thereby ensuring that the spacing between each first baffle portion 21 is x, and x is at most twice the width of the first long baffle 211.

[0045] This embodiment uses three guide rods 215 and a total of 9 groups of first baffle parts 21 are set, which is sufficient to meet the use of existing tumor radiotherapy. The spacing adjustment between the 9 groups of first baffle parts 21 is completed by driving an active rod, and it is ensured that the spacing between each group of first baffle parts 21 is consistent. Example 3

[0046] Based on the second embodiment, since the width of the first long baffles 211 is fixed, gaps will inevitably be generated when the first long baffles 211 move along the width direction, causing the high-energy rays output by the linear accelerator to hit the patient through the gaps, causing the radiation dose during radiotherapy to be out of control. In order to avoid this situation, Figure 3The beam mechanism 2 also includes a second baffle layer, which is composed of a plurality of second baffle portions 22 arranged in parallel. The second baffle portion 22 includes a second long baffle 222 and a second telescopic unit 221 for controlling the telescopic movement of the second long baffle 222. The telescopic direction of the second long baffle 222 is the same as that of the first long baffle 211. In order to accurately block the gaps generated by the first long baffle 211 at different spacings, the width of the second long baffle 222 is as small as possible. In this embodiment, the second baffle layer can use the same telescopic unit as the first baffle layer, or the existing multi-page grating layer. It is preferred to use a telescopic unit with a simpler structure and more convenient driving, which is the same as the second baffle layer. The second baffle layer is located above the first baffle layer. When the first baffle layer adjusts the spacing between the first long baffles 211, a gap is generated between the first long baffles 211. The second baffle portion 22 at the gap position is telescoped by the second telescopic unit 221 to block the gap between adjacent first long baffles 211, so as to prevent the high-energy rays output by the linear accelerator from being emitted to the patient through the gap. The second baffle layer is directly fixed after the corresponding baffle adjustment is performed according to the position where the gap is generated by the first baffle layer, so that the second baffle layer does not need to control the telescopic degree of the first long baffle 211 as the angle changes like the first baffle layer, and will not affect the speed of the reaction speed device adapting to the change of the hot spot during rotational radiotherapy. It is ensured that the high-energy rays can only be output from the lattice hole 2111.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A mechanical device for implementing spatial fractionation radiotherapy, comprising a linear accelerator arranged on a frame, characterized in that: A beam mechanism (2) is arranged at the head position of the linear accelerator, and high-energy rays generated by the linear accelerator are output through the beam mechanism (2). The beam mechanism (2) comprises a first baffle layer, the first baffle layer is composed of a plurality of first baffle portions (21) arranged in parallel, the first baffle portions (21) are slidably arranged in a constraint frame (23), a single first baffle portion (21) comprises a first long baffle (211) and a first telescopic unit (212) for controlling the first long baffle (211) to move in a length direction of the first long baffle (211), and the first long baffle (211) is provided with a lattice hole (2111).

2. A mechanical device for implementing spatial fractionation radiotherapy according to claim 1, characterized in that: A plurality of lattice holes (2111) are arranged at intervals on the first long baffle plate (211).

3. A mechanical device for implementing spatial fractionation radiotherapy according to claim 2, characterized in that: The first baffle portion (21) also includes a translation unit (213), and the translation unit (213) can control the movement of a single first long baffle (211) in the width direction thereof.

4. A mechanical device for implementing spatial fractionation radiotherapy according to claim 3, characterized in that: The light beam mechanism (2) further comprises a second baffle layer, the second baffle layer comprising a plurality of second baffle portions (22) arranged in parallel, the second baffle portions (22) comprising a second long baffle (222) and a second telescopic unit (221) for controlling the telescopic movement of the second long baffle (222), the telescopic direction of the second long baffle (222) being the same as the telescopic direction of the first long baffle (211).

5. The mechanical device for implementing spatial fractionation radiotherapy according to claim 3, characterized in that: The first telescopic unit (212) comprises a telescopic rod (2121) transmission-connected to the motor, and the telescopic rod (2121) is inserted into the first long baffle (211).

6. A mechanical device for implementing spatial fractionation radiotherapy according to claim 5, characterized in that: The translation unit (213) comprises a sliding seat (214), the sliding seat (214) being slidably arranged on a guide rod (215) on one side of the light beam mechanism (2), and the telescopic rod (2121) being arranged on the sliding seat (214).

7. A mechanical device for implementing spatial fractionation radiotherapy according to claim 6, characterized in that: The guide rod (215) portion comprises a plurality of guide rods (215) arranged in parallel on the same vertical plane, and the first telescopic units (212) in adjacent first baffle portions (21) are arranged on different guide rods (215).

8. The mechanical device for implementing spatial fractionation radiotherapy according to claim 7, characterized in that: The guide rod (215) is a threaded screw rod, and the sliding seat (214) is provided with a screw rod nut (216) adapted to the threaded screw rod.

9. A mechanical device for implementing spatial fractionation radiotherapy according to claim 8, characterized in that: The plurality of guide rods (215) of the guide rod (215) part comprise a first active rod (2151) and a plurality of driven rods, the end of the first active rod (2151) being provided with an active latching tooth group (2154) connected to the motor in transmission, the end of each driven rod being provided with a driven latching tooth (2155) meshing with the active latching tooth group (2154), and the transmission ratio between the driven latching tooth (2155) on the driven rod and the active latching tooth group (2154) increasing successively.

10. A mechanical device for implementing spatial fractionation radiotherapy according to claim 9, characterized in that: The guide rod (215) is provided with thread segments with different pitches, and the sliding seats (214) at different thread segments on a single guide rod (215) will move different distances along the corresponding guide rod (215) when the corresponding guide rod (215) rotates.

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