Limb fixing device for radiotherapy and limb radiotherapy fixing method

Abstract

The invention discloses a limb fixing device for radiotherapy. The limb fixing device comprises a fixing bottom plate, a first lifting bracket is arranged on the fixed bottom plate; a thermoplastic lower film is mounted on the first lifting bracket; the thermoplastic lower film is connected with a thermoplastic upper film; during fixing, the first lifting bracket supports a foot or a hand, and the thermoplastic upper film is matched with the thermoplastic lower film to vertically clamp, wrap and fix the foot or the hand; a second lifting bracket is further arranged on the fixed bottom plate; the second lifting bracket is used for supporting and fixing legs or arms of the patient; the first lifting bracket is adopted to lift the thermoplastic lower film to a certain height, so that a space capable of accommodating a foot downwards is formed between the thermoplastic lower film and the fixed bottom plate, and when an affected foot is placed on the heated foot thermoplastic lower film, the foot thermoplastic lower film can be sunken and deformed under pressure, so that the affected foot is prevented from falling off. And after being molded, the insole can be better attached to easy-to-move areas such as toes, heels, ankle joints and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of tumor radiotherapy assistance, in particular to a four-limb fixation device for radiotherapy and a four-limb radiotherapy fixation method. Background Art

[0002] In tumor radiotherapy, a comfortable and highly repeatable body position fixation device is crucial for radiotherapy implementation. By reducing the displacement within and between radiotherapy fractions, the prescribed dose of the target area can be effectively ensured, enabling precise irradiation of the tumor while minimizing damage to surrounding normal tissues to the greatest extent. To prevent the patient from moving during radiotherapy, a body position fixation device is required to fix the patient, and at the same time, the comfort and stability of the fixation need to be ensured. Otherwise, during radiotherapy, the patient is likely to tilt or shift due to discomfort, resulting in a reduced radiotherapy effect.

[0003] Currently, there are relatively mature positioning and fixation devices for radiotherapy of the head and neck, chest and abdomen, and pelvic tumors. However, due to the complexity of the four limbs' joints and their large mobility, there is no unified consensus among different radiotherapy centers, and there are various fixation methods such as using vacuum pads, foaming adhesives, T-shaped shoes, and various self-made or modified auxiliary positioning devices. Moreover, since the four limbs are not the locations with a high incidence of tumors, the current market does not attach much importance to the research and development of four-limb radiotherapy fixation devices. In actual work, it is found that during radiotherapy of the four limbs, compared with the radiotherapy processes of other affected parts, the situation of radiotherapy position deviation and dislocation occurs the most, and the current four-limb fixation devices also have the most loosening and displacement. This may be due to the complexity of the four limbs' joint activities and the subtle differences in the bone structures of different patients.

[0004] In the prior art, to solve the above problems, there have already appeared special four-limb radiotherapy fixation devices. For example, Patent CN210205622U records a four-limb radiotherapy body position fixation device. The upper or lower limb is clamped and fixed between the upper and lower layers of thermoplastic films through a thermoplastic film positioning device. When the thermoplastic film is heated to 70°C, it will become semi-transparent and softened, and after 3 to 5 minutes, it will harden and shape at room temperature to form a shape matching the shape of the upper or lower limb, thereby fixing the upper or lower limb. Currently, using thermoplastic films for radiotherapy fixation has gradually become the mainstream trend. However, the fixation effect of this thermoplastic film fixation device on the affected foot is poor. When fixing the lower limb with this technology, the lower thermoplastic film is laid flat and fixed on a horizontal hard bottom plate, and the foot is then placed on the lower thermoplastic film on the horizontal hard bottom plate. Such a thermoplastic film fixation method cannot well wrap the heel and ankle joint during fixation, and gaps are likely to appear after the thermoplastic film cools, providing effective space for foot movement. In addition, the movement of the knee joint will also cause the foot or leg to rotate, resulting in deviation. Therefore, attention also needs to be paid to the fixation of the thigh, calf, and knee joint when fixing the foot. Summary of the Invention

[0005] The object of the present invention is to overcome the disadvantages of the prior art and provide a four-limb fixing device for radiotherapy and a four-limb radiotherapy fixing method.

[0006] The object of the present invention is achieved by the following technical solutions: A four-limb fixing device for radiotherapy, wherein a first lifting bracket is arranged on the fixing bottom plate; a thermoplastic lower film is installed on the first lifting bracket; the thermoplastic lower film is connected with a thermoplastic upper film; when fixing, the first lifting bracket holds up the foot or hand, and the thermoplastic upper film cooperates with the thermoplastic lower film to clamp and wrap the foot or hand up and down; a second lifting bracket is also arranged on the fixing bottom plate; the second lifting bracket is used to hold up the patient's leg or arm and fix it.

[0007] The first lifting bracket can lift the thermoplastic lower film of the foot to a certain height, so that a region that can accommodate the heel to press down is formed between the thermoplastic lower film of the foot and the fixing bottom plate. The diseased foot automatically presses down on the heated thermoplastic lower film of the foot, and the thermoplastic lower film of the foot can deform in a concave shape under pressure, and can better fit the heel, ankle joint and other areas that are prone to movement. Cooperating with the thermoplastic film softened by heating from above to clamp and cover from above, and then cooling and shaping, more stable fixation of the sole, ankle joint and heel positions is achieved, avoiding displacement within and between radiotherapy fractions; a second lifting bracket is arranged in cooperation with the first lifting bracket. If the patient suspends the sole of the foot in the air for a long time, the thigh muscles need to cooperate to exert force, and the patient cannot persist for a long time. The second lifting bracket can not only solve the problem of instability when the lower leg is in a suspended state, but also fix the patient's leg and knee joint, avoiding displacement of the diseased foot caused by the movement of the knee joint. Another main purpose of raising the leg is to lift the affected limb, which is easy to avoid the healthy lower limb when designing the radiotherapy plan. If the leg is not raised, the foot bracket can still surround and fix the foot when it is lowered to the lowest position. At this time, the healthy lower limb needs to be kept in a curled state as much as possible and fixed with a strap. In the present invention, the materials used for the structures of the fixing bottom plate, the first bracket and the second bracket can be selected as carbon fiber material or Kevlar fiber material according to CT positioning or MR positioning in different radiotherapy centers, avoiding problems with magnetic resonance compatibility.

[0008] Preferably, the first lifting bracket includes a first lifting bracket base, a lifting mechanism and an installation frame; a slider is arranged on the first lifting bracket base; a slide rail is arranged on the fixing bottom plate; a limiting block is arranged at one end of the slide rail for locking the slider; the lifting mechanism is installed on the first lifting bracket base; the top of the lifting mechanism is connected to the installation frame; the installation frame is provided with installation holes for fixing with the thermoplastic lower film; a hand-holding handle is detachably installed on the installation frame.

[0009] In the present invention, the frame structure of the mounting frame is used to mount the thermoplastic lower film, which is conducive to forming a space below it for the thermoplastic lower film to deform. The slide rail on the fixed base plate can adapt to different patients and can be locked when the slider slides to the limit block; the lifting mechanism can be a manually adjustable fixed lifting mechanism or an electrically adjustable fixed lifting mechanism. When using electric lifting, the electric lifting frame structure in the second lifting bracket of the present invention can be referred to, and when using electric lifting, it can be synchronized with the second lifting bracket motor through a reasonable transmission mechanism. The hand-holding handle detachably mounted on the mounting frame can be used for the patient to hold the handle with the palm of the hand when fixing the hand, so as to maintain a fixed posture. Then, similarly, the thermoplastic lower film and the thermoplastic upper film are used in cooperation to clamp and fix the hand and wrist joint.

[0010] Preferably, the lifting mechanism includes a fixed cylinder and a sliding rod; the upper end of the sliding rod is connected to the mounting frame; a limiting structure is provided on the inner wall of the fixed cylinder; a protrusion is provided on the side wall of the sliding rod corresponding to the limiting structure; the protrusion cooperates with the limiting structure to fix the height position of the sliding rod. The limiting mechanism adopted in the present invention is to provide a limiting groove on the inner wall of the fixed cylinder, and the protrusion is stuck in the limiting groove to fix it; it can also be designed as any reasonable limiting structure according to needs for height fixation.

[0011] Preferably, two first lifting brackets are oppositely arranged on the fixed base plate; calf fixing holes and thigh fixing holes are also provided on the base plate; the calf fixing holes on the base plate are used to mount the calf thermoplastic film; the thigh fixing holes on the base plate are used to mount the thigh thermoplastic film; the calf fixing holes and thigh fixing holes on the support plate or are used to mount the calf-thigh integrated thermoplastic film so as to fix the calf, thigh and knee joint at the same time. Two first lifting brackets arranged oppositely correspond to the two feet respectively. On one side of the first lifting bracket, calf fixing holes and thigh fixing holes on the base plate are arranged in sequence corresponding to the calf and thigh. When the radiotherapy position is on the leg or it is not necessary to lift and fix the foot, the calf fixing holes and thigh fixing holes on the base plate are used to mount the calf thermoplastic film, thigh thermoplastic film or calf-thigh integrated thermoplastic film respectively to fix the calf, thigh or knee joint. The calf fixing holes and thigh fixing holes on the base plate include multiple ones to adapt to patients of different body types. In the present invention, the calf thermoplastic film and the thigh thermoplastic film can be the same long film, that is, the calf-thigh integrated thermoplastic film, or can be two short films respectively corresponding to the calf and thigh corresponding fixing holes. The advantage of the integrated film is that it can fix the knee joint together.

[0012] Preferably, the second lifting bracket includes an electric lifting frame, a calf support and a thigh support; the calf support is installed on the top of the electric lifting frame; one side edge of the calf support is hinged to the thigh support; the calf support is provided with a support calf fixing hole; the thigh support is provided with a support thigh fixing hole; the support calf fixing hole is used to install a calf thermoplastic film; the support thigh fixing hole is used to install a thigh thermoplastic film; the support calf fixing hole and the support thigh fixing hole are used to install a calf-thigh integrated thermoplastic film.

[0013] In the present invention, one side edge of the calf support plate is hinged to the thigh support plate. When the calf and foot are raised horizontally, the thigh and calf are tilted at a certain angle. The thigh support plate connected by the hinge can be flexibly turned at a suitable angle on one side of the calf support plate to fit the thigh, tilting the thigh to lift it up, and avoiding the patient's thigh fatigue and inability to persist. The support plate calf fixing holes and support plate thigh fixing holes include multiple holes to accommodate patients of different body shapes.

[0014] Preferably, the electric lifting frame includes a second lifting bracket base, a second lifting bracket top frame, a first articulated arm, and a second articulated arm; a lower translation slot is provided on the second lifting bracket base; a lower translation block for reciprocating translation is provided in the lower translation slot; one end of the first articulated arm is hinged to the lower translation block; the other end of the first articulated arm is hinged to the second lifting bracket top frame; the middle part of the second articulated arm and the middle part of the first articulated arm are hinged to each other; an upper translation slot is provided on the second lifting bracket top frame; an upper translation block is provided in the upper translation slot; one end of the second articulated arm is hinged to the upper translation block; the other end of the second articulated arm is hinged to the second lifting bracket base; the second lifting bracket top frame is connected to the calf support plate.

[0015] In the present invention, when the motor drives the lower translation block to move back and forth in the lower translation groove, the lower end of the first articulated arm is driven to translate, so that the angle between the first articulated arm and the second articulated arm changes, and the upper translation block connected to the second articulated arm translates in the upper translation groove accordingly, so as to realize the lifting and lowering of the second lifting bracket top frame, and drive the calf support plate fixed to the second lifting bracket top frame to rise. In the present invention, the motor adopts a conventional commercially available small low-voltage motor, which is fixed on a small base adapted to lithium batteries, and can achieve high and low speeds and forward and reverse rotation. The bottom surface of the small base has a raised limit device that can be conveniently installed on the corresponding position of the second lifting bracket base. Any reasonable model can be selected according to needs. The present invention preferably uses motors and circuit boards that are easy to disassemble and have remote control buttons.

[0016] Preferably, a threaded rod is disposed in the lower translation groove; the lower translation block is sleeved on the threaded rod, and when the threaded rod rotates, the lower translation block reciprocates axially along the threaded rod; one end of the threaded rod is connected to the chute wall through a bearing member; the other end of the threaded rod passes through the chute and is movably sleeved with a locking nut; the motor is disposed on the leg lifting base through a mounting plate; the output shaft of the motor is connected with a driving wheel; a driven wheel is sleeved on the threaded rod; the driving wheel meshes with the driven wheel, and the driving wheel drives the driven wheel to rotate to drive the threaded rod to rotate.

[0017] In the present invention, the threaded rod rotates in the lower translation groove under the drive of the motor, driving the lower translation block sleeved thereon to perform a linear motion; there are digital marks at the sliding positions of the corresponding translation blocks on the second lifting bracket base for recording the corresponding lifting heights; when the lifting height is selected, the threaded rod is tightened and fixed through the locking nut, and then the motor together with the mounting plate is removed from the leg lifting base, and the driving wheel and the driven wheel are separated to avoid the metal motor from affecting radiotherapy, thereby realizing the locking of the lifting height of the electric lifting frame; the gear transmission is beneficial to more safely installing the motor to a suitable position, and at the same time is beneficial to the flexibility of the motor disassembly. Any other reasonable motor connection method can also be adopted.

[0018] Preferably, a thigh support plate slider is disposed on one side of the thigh support plate away from the calf support plate; a chute is correspondingly disposed on the second lifting bracket base for the thigh support plate slider; in the present invention, the free end of the thigh support plate can translate and slide in the chute through the slider at the lower end of the thigh support plate, so as to be beneficial to flexibly adjusting the inclination angle and fitting with the patient's thigh. The present invention can also install positioning rods at the corresponding hip and waist positions on the fixed bottom plate in a detachable connection manner, so as to connect and fix a vacuum pad, a foaming glue, a thermoplastic forming pad, etc. to improve the comfort of the patient when lying supine.

[0019] The present invention also provides a method for fixing the limbs during radiotherapy, which uses the above-mentioned limb fixing device for radiotherapy for fixation, specifically including Fixation of the foot and lower limb during radiotherapy: 1) Install the first lifting bracket on the fixed bottom plate, and install the second lifting bracket at the corresponding leg position on the fixed bottom plate; 2) The patient lies flat on the fixed bottom plate, starts the motor to raise the second lifting bracket, places the calf on the calf support plate of the second lifting bracket, places the thigh on the thigh support plate of the second lifting bracket, the thigh support plate obliquely supports the thigh, tightens the locking nut to fix the threaded rod, removes the motor from the mounting plate, and separates the driving wheel from the driven wheel; 3) Place the patient's foot on the first lifting bracket, push the first lifting bracket to the limit block to lock the horizontal position of the first lifting bracket, and raise the first lifting bracket; 4) After the height of the first lifting bracket is selected, ensure that the installation frame is flush with the central axis of the lower leg to lay flat the foot and lower leg; install the heated thermoplastic lower film on the first lifting bracket, and press down the foot to deform the thermoplastic lower film; 5) Cooperatively install the heated thermoplastic upper film on the thermoplastic lower film to wrap the foot, and cool and shape it to fix the foot; install the heated lower leg thermoplastic film on the lower leg fixing hole of the support plate of the second lifting bracket, and cool and shape it to fix the lower leg; install the heated thigh thermoplastic film on the thigh fixing hole of the support plate, and cool and shape it to fix the thigh; or without using the second lifting bracket, respectively use the lower leg fixing hole and the thigh fixing hole of the bottom plate to install the heated integrated lower leg and thigh thermoplastic film, and cool and shape it to fix the lower leg, thigh and knee joint.

[0020] The four-limb fixation device for radiotherapy of the present invention can also perform leg radiotherapy fixation: The steps for performing leg radiotherapy fixation without using the second bracket are as follows: 1) The patient lies flat on the fixed bottom plate, with the lower legs located between the lower leg fixing holes on both sides, and the thighs located between the thigh fixing holes on both sides; 2) Install the heated lower leg thermoplastic film on the lower leg fixing hole of the bottom plate, and cool and shape it to fix the lower leg; install the heated thigh thermoplastic film on the thigh fixing hole of the bottom plate, and cool and shape it to fix the thigh; or respectively use the lower leg fixing hole and the thigh fixing hole of the bottom plate to install the heated integrated lower leg and thigh thermoplastic film, and cool and shape it to fix the lower leg, thigh and knee joint.

[0021] The steps for performing leg radiotherapy fixation using the second bracket are as follows: 1) The patient lies flat on the fixed bottom plate, start the motor to raise the second lifting bracket, place the lower legs on the lower leg support plate of the second lifting bracket, and place the thighs on the thigh support plate of the second lifting bracket. The thigh support plate obliquely supports the thighs. After the height is selected, tighten the locking nut to fix the threaded rod, remove the motor from the mounting plate, and separate the driving wheel from the driven wheel; 2) Install the heated lower leg thermoplastic film on the lower leg fixing hole of the support plate of the second lifting bracket, and cool and shape it to fix the lower leg; install the heated thigh thermoplastic film on the thigh fixing hole of the support plate, and cool and shape it to fix the thigh; or install the heated integrated lower leg and thigh thermoplastic film on the lower leg fixing hole and the thigh fixing hole of the support plate, and cool and shape it to fix the lower leg, thigh and knee joint. Using the second bracket for leg radiotherapy fixation can lift the affected limb and avoid the healthy lower limb.

[0022] The four - limb fixation device for radiotherapy of the present invention can also be used for radiotherapy fixation of the hand, wrist joint and forearm. During fixation, the affected limb is lifted upward and the hand is placed on the palm thermoplastic lower film of the first lifting bracket. A hand - holding handle is detachably connected to the first lifting bracket for the hand to hold during fixation. Then, a palm thermoplastic upper film is installed to fix the hand and wrist joint, and the second lifting bracket holds up the arm and fixes the forearm with a thermoplastic film. When fixing the arm, the calf thermoplastic film is used as the forearm thermoplastic film to fix the forearm and elbow joint. The present invention can also install positioning rods at corresponding positions on the fixed bottom plate in a detachable connection manner, so as to connect and fix a vacuum pad, or foaming glue, or thermoplastic forming pad, etc., to improve the comfort of the patient when lying supine, and fix the head to make it deviate to the healthy side to avoid the radiation as much as possible.

[0023] The present invention has the following advantages: 1. The present invention uses a thermoplastic film in cooperation with the first lifting bracket and the second lifting bracket. It has a simple structure, is convenient to operate and use, can improve the comfort of patients and the repeatability. It can not only reduce the setup error, effectively control the displacement of the patient due to involuntary movement during the treatment process, reduce the displacement within and between radiotherapy fractions, effectively ensure the prescription dose of the target area, and at the same time can minimize the damage to the surrounding normal tissues to meet the requirements of accurate setup and accurate treatment. Moreover, it also reduces the setup difficulty of radiotherapy technicians, thus realizing precise radiotherapy and ensuring the radiotherapy effect.

[0024] 2. In traditional four - limb fixation, the radiotherapy marking lines are often directly drawn on the affected limb, which is prone to problems such as fading, disappearance and affecting the appearance. The present invention can draw the radiotherapy marking lines on the thermoplastic film, thus avoiding the above problems.

[0025] 3. The present invention uses the first lifting bracket to raise the thermoplastic lower film to a certain height, so that a region that can accommodate the downward pressure of the foot is formed between the thermoplastic lower film and the fixed bottom plate. The foot placed on the thermoplastic lower film can cause the heated thermoplastic lower film to collapse and deform under pressure, which can better fit the heel and ankle joints and other areas prone to movement. With the clamping and covering of the heated and softened thermoplastic upper film and then cooling and shaping, more stable fixation of the heel and ankle joint is achieved, avoiding the displacement within and between radiotherapy fractions.

[0026] 4. The present invention is provided with a second lifting bracket in cooperation with the first lifting bracket. If the patient raises the foot and suspends it for a long time, the thigh muscles need to cooperate to exert force, and the patient cannot hold for a long time. The second lifting bracket can not only solve the problem of the instability of the calf in a suspended state, but also fix the patient's leg. After the calf and thigh are fixed, the knee joint cannot rotate, avoiding the displacement of the affected limb caused by the movement of the knee joint.

[0027] 5. The present invention cooperates with the second lifting bracket and the first lifting bracket to lift the affected limb, making it easy to avoid the healthy lower limb when designing the radiotherapy plan. If the affected limb cannot be lifted, the foot bracket can still surround and fix the foot even when it is lowered to the lowest position. Remove the second lifting bracket, and at the same time, the carbon fiber fixing bottom plate can cooperate with the calf fixing holes and the thigh fixing holes to install the heated integrated calf and thigh thermoplastic film. After cooling and shaping, it can fix the calf, thigh, and knee joint. At this time, the healthy lower limb needs to be kept in a curled state as much as possible to avoid the rays, and it can be fixed with a strap. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of the present invention in a working state.

[0029] Figure 2 It is a schematic structural diagram of the present invention from a perspective.

[0030] Figure 3 It is a schematic structural diagram of the first lifting bracket in a working state.

[0031] Figure 4 It is an installation schematic diagram of the thigh support plate and the calf support plate.

[0032] Figure 5 It is a schematic structural diagram of the second lifting bracket.

[0033] Figure 6 It is a schematic diagram of a part of the present invention.

[0034] Figure 7 It is a schematic structural diagram of the present invention in another working state.

[0035] Figure 8 It is a side view of the present invention in another working state.

[0036] Figure 9 It is a disassembly schematic diagram of the first lifting bracket.

[0037] Figure 10 It is a structure of the thermoplastic film.

[0038] Figure 11 It is another structure of the thermoplastic film.

[0039] Figure 12 It is another structure of the thermoplastic film.

[0040] Figure 13 It is a schematic structural diagram of the first lifting bracket in another working state.

[0041] In the figure: 1. Fixed bottom plate; 2. First lifting bracket; 201. Mounting frame 201; 202. Lifting mechanism; 2021. Fixed cylinder; 2022. Sliding rod; 2023. Limiting structure; 2024. Protrusion; 203. Base of the first lifting bracket; 3. Second lifting bracket; 301. Calf support plate; 302. Thigh support plate; 4. Slide rail; 5. Limiting block; 6. Fixed hole for calf on the bottom plate; 7. Fixed hole for thigh on the bottom plate; 8. Lower thermoplastic film; 9. Upper thermoplastic film; 10. Fixed hole for calf on the support plate; 11. Fixed hole for thigh on the support plate; 12. Slide block of the thigh support plate; 13. Chute; 14. Base of the second lifting bracket; 15. Lower translation groove; 16. Lower translation block; 17. Threaded rod; 181. Driven wheel; 182. Driving wheel; 183. Motor; 184. Mounting plate; 19. Locking nut; 20. Upper translation groove; 21. First articulated arm; 22. Second articulated arm; 23. Upper translation block; 24. Top frame of the second lifting bracket; 25. Hand-holding handle. Detailed implementation mode

[0042] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0044] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0045] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0046] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Embodiment 1: As Figures 1-13 shown, a four - limb fixation device for radiotherapy includes a fixed bottom plate 1; a first lifting bracket 2 is provided on the fixed bottom plate 1; a thermoplastic lower film 8 is installed on the first lifting bracket 2; the thermoplastic lower film 8 is connected to a thermoplastic upper film 9; when fixing, the first lifting bracket 1 holds up the foot or hand, and the thermoplastic upper film 9 cooperates with the thermoplastic lower film 8 to clamp and wrap the foot or hand for fixation; a second lifting bracket 3 is also provided on the fixed bottom plate 1; the second lifting bracket 3 is used to hold up and fix the patient's leg or arm.

[0049] The first lifting bracket 2 is used to lift the lower foot thermoplastic film 8 to a certain height, so that a region capable of accommodating the downward pressing of the heel is formed between the lower thermoplastic film 8 and the fixed bottom plate 1. The affected foot presses the lower thermoplastic film 8 downward, and the heated lower thermoplastic film 8 can collapse and deform under pressure, and can better fit the heel, ankle joint and other areas prone to movement. With the clamping and covering of the heated and softened upper thermoplastic film from above and then cooling and shaping, more stable fixation of the positions of the sole, ankle joint and heel is achieved, avoiding displacement during and between radiotherapy fractions; a second lifting bracket 3 is arranged in cooperation with the first lifting bracket 2. If the patient suspends the sole for a long time, the thigh muscles need to cooperate to exert force, and the patient cannot persist for a long time. The second lifting bracket 3 can not only solve the problem of the laborious suspension of the sole, but also fix the patient's leg and other knee joints to avoid the displacement of the affected foot caused by the movement of the knee joint. Another main purpose of raising the leg is to lift the affected limb, which is easy to avoid the healthy lower limb when designing the radiotherapy plan. If the leg is not raised, the foot bracket can still surround and fix the foot when it is lowered to the lowest position. At this time, the healthy lower limb needs to be curled up as much as possible and fixed with a strap. In the present invention, the materials used for the structures of the fixed bottom plate 1, the first bracket 2 and the second bracket 3 can be selected as carbon fiber material or Kevlar fiber material according to CT positioning or MR positioning in different radiotherapy centers to avoid problems with magnetic resonance compatibility.

[0050] The first lifting bracket 2 includes a first lifting bracket base 203, a lifting mechanism 202 and a mounting frame 201; a slider is arranged on the first lifting bracket base 203; a slide rail 4 is arranged on the fixed bottom plate; a limit block 5 is arranged at one end of the slide rail 4 for locking the slider; the lifting mechanism 202 is installed on the first lifting bracket base 203; the top of the lifting mechanism 202 is connected to the mounting frame 201; mounting holes are arranged on the mounting frame 201 for fixing with the lower thermoplastic film 8; a hand-holding handle 25 is detachably installed on the mounting frame 201.

[0051] In this embodiment, the frame structure of the mounting frame 201 is used to mount the lower thermoplastic film 8, which is beneficial to forming a space for the heated lower thermoplastic film 8 to deform below after being lifted. The slide rail 4 can adapt to patients of different heights within a certain range on the fixed bottom plate 1 and can lock the position through the limit block 5; the lifting mechanism 202 can adopt a manually lifted and adjusted fixed lifting mechanism 202 or an electrically lifted and adjusted fixed lifting mechanism 202. When using electric lifting, the electric lifting frame structure in the second lifting bracket 3 of this embodiment can be referred to. When using electric lifting, it can be synchronized with the motor 183 of the second lifting bracket 3 through a reasonable transmission method to ensure that the lifting heights of the two are fixed.

[0052] The lifting mechanism 202 includes a fixed cylinder 2021 and a sliding rod 2022; the upper end of the sliding rod 2022 is connected to the mounting frame 2021; a limiting structure 2023 is provided on the inner wall of the fixed cylinder 2021; a protrusion 2024 is provided on the side wall of the sliding rod 2022 corresponding to the limiting structure 2023; the protrusion 2024 cooperates with the limiting structure 2023 to fix the height position of the sliding rod 2022; two first lifting brackets 2 are oppositely arranged on the fixed bottom plate 1; a calf fixing hole 6 and a thigh fixing hole 7 are further provided on the fixed bottom plate 1; the calf fixing hole 6 is used for installing a calf thermoplastic film; the thigh fixing hole 7 is used for installing a thigh thermoplastic film; two first lifting brackets 2 arranged oppositely correspond to two feet, and the calf fixing hole 6 and the thigh fixing hole 7 are sequentially arranged on one side of the first lifting bracket 2. When the radiotherapy position is on the leg or the feet do not need to be lifted and fixed, the calf thermoplastic film and the thigh thermoplastic film are installed using the calf fixing hole 6 and the thigh fixing hole 7 respectively to fix the thigh or calf. The calf fixing hole 6 and the thigh fixing hole 7 include multiple holes to accommodate patients with different body types. In this embodiment, the calf thermoplastic film and the thigh thermoplastic film can be the same long film (see the attached drawings of the specification Figure 10 ), that is, an integrated calf and thigh thermoplastic film, or they can be two short films respectively (see the attached drawings of the specification Figure 11 ), and are installed in the corresponding fixing holes of the calf and thigh respectively. The advantage of using one film is that it can fix the knee joint together.

[0053] The second lifting bracket 3 includes an electric lifting frame, a calf support plate 301, and a thigh support plate 302; the calf support plate 301 is installed on the top of the electric lifting frame; one side edge of the calf support plate 301 is hinged to the thigh support plate 302; a support plate calf fixing hole 10 is provided on the calf support plate 301; a support plate thigh fixing hole 11 is provided on the thigh support plate 302; the support plate calf fixing hole 10 is used for installing a calf thermoplastic film; the support plate calf fixing hole 10 and the support plate thigh fixing hole 11 are used for installing an integrated calf and thigh thermoplastic film; the support plate thigh fixing hole 11 is used for installing a thigh thermoplastic film; one side edge of the calf support plate 301 is hinged to the thigh support plate 302. When the calf and the feet are lifted horizontally, the thigh and the calf are inclined at a certain angle. The hinged thigh support plate 302 can flexibly flip at an appropriate angle on one side of the calf support plate 301 to fit the thigh and lift the thigh obliquely to prevent the patient's thigh from becoming weak and unable to hold on. The support plate calf fixing hole 10 and the support plate thigh fixing hole 11 include multiple holes to accommodate patients with different body types.

[0054] The electric lifting frame includes a second lifting bracket base 14, a second lifting bracket top frame 24, a first articulated arm 21, and a second articulated arm 22; a lower translation groove 15 is provided on the second lifting bracket base 14; a reciprocating translation lower translation block 16 is provided in the lower translation groove 15; one end of the first articulated arm 21 is articulated with the lower translation block 16; the other end of the first articulated arm 21 is articulated with the second lifting bracket top frame 24; the middle parts of the second articulated arm 22 and the first articulated arm 21 are articulated with each other; an upper translation groove 20 is provided on the second lifting bracket top frame 24; an upper translation block 23 is provided in the upper translation groove 20; one end of the second articulated arm 22 is articulated with the upper translation block 23; the other end of the second articulated arm 22 is articulated with the second lifting bracket base 14; the second lifting bracket top frame 24 is connected to the calf support plate 301.

[0055] When the motor 183 drives the lower translation block 16 to reciprocate in the lower translation groove 15, it drives the lower end of the first articulated arm 21 to translate, causing the angle between the first articulated arm 21 and the second articulated arm 22 to change. The upper translation block 23 connected to the second articulated arm 22 then translates in the upper translation groove 20, realizing the lifting of the second lifting bracket top frame 24 and driving the calf support plate 301 fixed to the second lifting bracket top frame 24 to rise. In this embodiment, the motor 183 uses a conventional commercially available reversible motor 183, which can achieve forward and reverse rotation, and any reasonable model can be selected according to needs. This embodiment preferably selects a motor 183 that is lightweight and easy to disassemble.

[0056] A threaded rod 17 is provided in the lower translation groove 15; the lower translation block 16 is sleeved on the threaded rod 17, and when the threaded rod 17 rotates, it drives the lower translation block 16 to reciprocate axially along the threaded rod 17; one end of the threaded rod 17 is connected to the wall of the chute 13 through a bearing member; the other end of the threaded rod 17 passes through the chute 13 and is movably sleeved with a locking nut 19; the motor 183 is arranged on the leg lifting base through a mounting plate 184; the output shaft of the motor 183 is connected with a driving wheel 182; a driven wheel 181 is sleeved on the threaded rod 17; the driving wheel 182 meshes with the driven wheel 181, and the driving wheel 182 drives the driven wheel 181 to rotate to drive the threaded rod 17 to rotate.

[0057] In this embodiment, under the drive of the motor 183, the threaded rod 17 rotates in the lower translation groove 15, driving the lower translation block 16 sleeved thereon to perform a linear motion. After the lifting height is selected, the motor 183 is removed from the mounting plate 184, and the driving wheel 182 is separated from the driven wheel 181 to avoid the influence of the motor 183 on radiotherapy. Then, the threaded rod 17 is tightened and fixed by the lock nut 19, so as to realize the locking of the lifting height of the electric lifting frame; the gear transmission is beneficial to more safely installing the motor 183 to a suitable position, and at the same time is beneficial to the disassembly flexibility of the motor 183. Any other reasonable connection method of the motor 183 can also be adopted.

[0058] A thigh support slider 12 is arranged on one side of the thigh support plate 302 away from the calf support plate 301; a sliding groove 13 is correspondingly arranged on the second lifting bracket base 14 for the thigh support slider 12; when adjusting the inclination angle of the thigh support plate 302, the thigh support slider 12 at its lower end can be used to slide in the sliding groove 13.

[0059] Embodiment 2: A method for fixing the limbs during radiotherapy, which is fixed by using the radiotherapy limb fixing device of Embodiment 1, including: Steps for fixing the foot and lower limb during radiotherapy: 1) Install the first lifting bracket 2 on the fixed base plate 1, and install the second lifting bracket 3 at the corresponding leg position on the fixed base plate 1; 2) The patient lies flat on the fixed base plate 1, starts the motor 183 to lift the second lifting bracket 3, places the calf on the calf support plate 301 of the second lifting bracket 3, places the thigh on the thigh support plate 302 of the second lifting bracket 3, the thigh support plate 302 obliquely supports the thigh, tightens the lock nut 19 to fix the threaded rod 17, removes the motor 183 from the mounting plate 184, and separates the driving wheel 182 from the driven wheel 181; 3) Place the patient's foot on the first lifting bracket 2, push the first lifting bracket 2 to the limit block 5 to lock the horizontal position of the first lifting bracket 2, and lift the first lifting bracket 2; 4) After the height of the first lifting bracket 2 is selected, ensure that the mounting frame 201 is aligned with the central axis of the calf to flatten the foot and calf. Install the heated thermoplastic lower film 8 on the first lifting bracket 2, and press down the foot to deform the thermoplastic lower film 8; 5) Cooperatively install the heated thermoplastic upper film 9 on the thermoplastic lower film 8 to wrap the foot, cool and shape it to fix the foot; install the heated calf thermoplastic film on the calf fixing hole 10 of the support plate, cool and shape it to fix the calf; install the heated thigh thermoplastic film on the thigh fixing hole 11 of the support plate, cool and shape it to fix the thigh; or without using the second lifting bracket, respectively use the bottom plate calf fixing hole 6 and the bottom plate thigh fixing hole 7 to install the heated calf-thigh integrated thermoplastic film, cool and shape it to fix the calf, thigh and knee joint.

[0060] Radiotherapy fixation steps for the legs: 1) The patient lies flat on the fixed base plate 1, with the lower legs between the lower leg fixing holes 6 on both sides of the base plate and the thighs between the thigh fixing holes 7 on both sides of the base plate; 2) Install the heated lower leg thermoplastic film on the lower leg fixing holes 6 of the base plate, cool and shape it to fix the lower legs; install the heated thigh thermoplastic film on the thigh fixing holes 7 of the base plate, cool and shape it to fix the thighs; or install the heated lower leg and thigh integrated thermoplastic film on the lower leg fixing holes 6 and thigh fixing holes 7 of the base plate respectively, cool and shape it to fix the lower legs, thighs and knee joints.

[0061] Radiotherapy fixation steps for the hand, wrist joint and forearm: When fixing, lift the affected limb and place the hand on the thermoplastic lower film 8 of the first lifting bracket 2. A hand holding handle 25 is detachably connected to the first lifting bracket for holding the hand during fixation. Then, cooperate with the installation of the thermoplastic upper film 9 to fix the hand and wrist joint. The second lifting bracket 3 holds up the arm and fixes the forearm and elbow joint with a thermoplastic film. The positioning rod can also be installed at the corresponding position of the fixed base plate in a detachable connection manner, so as to connect and fix the vacuum pad, foaming glue or thermoplastic forming pad, etc. to improve the comfort of the patient when lying supine, and fix the head to tilt it towards the healthy side to avoid the radiation as much as possible.

[0062] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A four - limb fixation device for radiotherapy, comprising a fixed bottom plate; characterized in that: A first lifting bracket is provided on the fixed bottom plate; a thermoplastic lower film is installed on the first lifting bracket; the thermoplastic lower film is connected to a thermoplastic upper film; when fixing, the first lifting bracket holds up the foot or hand, and the thermoplastic upper film cooperates with the thermoplastic lower film to clamp and wrap the foot or hand up and down for fixation; a second lifting bracket is also provided on the fixed bottom plate; the second lifting bracket is used to hold up and fix the patient's leg or arm.

2. The four-limb fixation device for radiotherapy according to claim 1, wherein: The first lifting bracket includes a first lifting bracket base, a lifting mechanism and a mounting frame; a slider is provided on the first lifting bracket base; a slide rail is provided on the fixed bottom plate; a limit block is provided at one end of the slide rail for locking the slider; the lifting mechanism is installed on the first lifting bracket base; the top of the lifting mechanism is connected to the mounting frame; mounting holes are provided on the mounting frame for fixing with the thermoplastic lower film; a hand-holding handle is detachably installed on the mounting frame.

3. The four-limb fixation device for radiotherapy according to claim 2, characterized in that: The lifting mechanism includes a fixed cylinder and a sliding rod; the upper end of the sliding rod is connected to the mounting frame; a limiting structure is provided on the inner wall of the fixed cylinder; a protrusion is provided on the side wall of the sliding rod corresponding to the limiting structure; the protrusion cooperates with the limiting structure to fix the height position of the sliding rod.

4. The four - limb fixation device for radiotherapy according to claim 1, characterized in that: Two first lifting brackets are oppositely arranged on the fixed bottom plate; a bottom plate calf fixing hole and a bottom plate thigh fixing hole are also provided on the fixed bottom plate; the bottom plate calf fixing hole is used for installing a calf thermoplastic film; the bottom plate thigh fixing hole is used for installing a thigh thermoplastic film.

5. The four-limb fixation device for radiotherapy according to claim 1, wherein: The second lifting bracket includes an electric lifting frame, a calf support plate and a thigh support plate; the calf support plate is installed on the top of the electric lifting frame; one side edge of the calf support plate is hinged to the thigh support plate; a support plate calf fixing hole is provided on the calf support plate; a support plate thigh fixing hole is provided on the thigh support plate; the support plate calf fixing hole is used for installing a calf thermoplastic film; the support plate thigh fixing hole is used for installing a thigh thermoplastic film; the support plate calf fixing hole and the support plate thigh fixing hole may also be used for installing a calf-thigh integrated thermoplastic film.

6. The four-limb fixation device for radiotherapy according to claim 5, characterized in that: The electric lifting frame includes a second lifting bracket base, a second lifting bracket top frame, a first articulated arm and a second articulated arm; a lower translation groove is provided on the second lifting bracket base; a reciprocally translating lower translation block is provided in the lower translation groove; one end of the first articulated arm is hinged to the lower translation block; the other end of the first articulated arm is hinged to the second lifting bracket top frame; the middle of the second articulated arm is hinged to the middle of the first articulated arm; an upper translation groove is provided on the second lifting bracket top frame; an upper translation block is provided in the upper translation groove; one end of the second articulated arm is hinged to the upper translation block; the other end of the second articulated arm is hinged to the second lifting bracket base; the second lifting bracket top frame is connected to the calf support plate.

7. The four - limb fixation device for radiotherapy according to claim 6, wherein: A threaded rod is arranged in the lower translation slot; the lower translation block is sleeved on the threaded rod, and when the threaded rod rotates, it drives the lower translation block to reciprocate axially along the threaded rod; one end of the threaded rod is connected to the chute wall through a bearing member; the other end of the threaded rod passes through the chute and is movably sleeved with a locking nut; the motor is arranged on the leg lifting base through a mounting plate; the output shaft of the motor is connected with a driving wheel; a driven wheel is sleeved on the threaded rod; the driving wheel meshes with the driven wheel, and the driving wheel drives the driven wheel to rotate to drive the threaded rod to rotate.

8. The four - limb fixation device for radiotherapy according to claim 6, wherein: A thigh support plate slider is arranged on one side of the thigh support plate away from the calf support plate; a chute is correspondingly arranged on the second lifting bracket base for the thigh support plate slider.

9. A method for fixing radiotherapy of limbs, characterized in that: Fixation is carried out by using the four-limb fixation device for radiotherapy according to any one of claims 1-8.

10. The limb radiotherapy fixation method according to claim 9, characterized in that: Comprising Foot and lower limb radiotherapy fixation steps: Install the first lifting bracket on the fixed bottom plate, and install the second lifting bracket at the position corresponding to the leg on the fixed bottom plate; The patient lies flat on the fixed bottom plate, starts the motor to raise the second lifting bracket, places the calf on the calf support plate of the second lifting bracket, places the thigh on the thigh support plate of the second lifting bracket, the thigh support plate obliquely supports the thigh, tightens the locking nut to fix the threaded rod, removes the motor from the mounting plate, and separates the driving wheel from the driven wheel; Place the patient's foot on the first lifting bracket, push the first lifting bracket to the limit block to lock the horizontal position of the first lifting bracket, and raise the first lifting bracket; After the height of the first lifting bracket is selected, ensure that the installation frame and the central axis of the calf are aligned to level the foot and the calf; install the heated thermoplastic lower film on the first lifting bracket, and press down the foot to deform the thermoplastic lower film; 5) Cooperatively install the heated thermoplastic upper film on the thermoplastic lower film to cover the foot, shape and cool to fix the foot; install the heated calf thermoplastic film on the calf fixing hole of the support plate, shape and cool to fix the calf; install the heated thigh thermoplastic film on the thigh fixing hole of the support plate, cool and shape to fix the thigh; Hand radiotherapy fixation steps: When fixing, lift the affected limb and place the hand on the thermoplastic lower film of the first lifting bracket, install a hand-holding handle on the first lifting bracket, hold the handle with the palm when fixing, cooperatively install the thermoplastic upper film to fix the hand and the wrist joint, and the second lifting bracket supports the arm and fixes the forearm and the elbow joint.

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