Lower limb fixing device for radiotherapy

Abstract

The invention relates to the technical field of medical instruments, in particular to a lower limb fixing device for radiotherapy, which comprises a bed board and symmetrically arranged leg fixing frames, air bag assemblies are arranged in the leg fixing frames, symmetrically arranged placing grooves are formed in one side, close to the leg fixing frames, of the bed board, and sole fixing boxes are placed in the placing grooves; electromagnet partition plates are fixedly connected in the sole fixing boxes and divide the interiors of the sole fixing boxes into air cavities and fixing cavities, sliding assemblies used for compressing air into the air bag assemblies are arranged in the air cavities, and air inlet pipes are communicated between the air cavities and the air bag assemblies; the fixing cavity is internally provided with a plurality of rod assemblies used for increasing the fixing effect along with contraction of the foot sole of the patient and a rod frame assembly used for generating elastic deformation according to movement of the rod assemblies to change resistance change so as to measure the size of the foot sole of the patient. By means of the foot sole fixing box and the leg fixing frame, lower limb fixation is provided for a patient, meanwhile, foot sole and leg displacement of the patient is sensed, and then the lower limbs of the patient are reinforced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical appliances, and in particular to a lower limb fixation device for radiotherapy. Background Art

[0002] Radiotherapy, as one of the important means of tumor treatment, is increasingly widely used in clinical practice. Its principle is to irradiate the tumor with naturally occurring or artificial high-energy X-rays, destroy the double-stranded DNA of tumor cells or change the surrounding environment of cells, thereby causing the tumor to regress, thereby achieving the purpose of treating the tumor. During radiotherapy, it is crucial to fix the patient's position. Since radiotherapy requires high precision and the deviation needs to be controlled to the millimeter level, it is necessary to ensure that the patient can receive treatment in the same position during each treatment to reduce the treatment position error caused by factors such as patient movement and breathing, and improve the accuracy and effect of treatment. As an important part of the human body, the lower limbs also need to be fixed during radiotherapy. Especially when treating pelvic, abdominal and lower limb tumors, the fixation of the lower limbs is particularly critical to ensure the accuracy of the treatment position. By fixing the lower limbs, the displacement during the treatment process can be further reduced, and the local control effect of radiotherapy can be improved, thereby prolonging the patient's survival and improving their quality of life.

[0003] At present, the commonly used lower limb fixation techniques for radiotherapy mainly include body membrane fixation and vacuum pad fixation. However, these technologies all have certain defects in practical applications: although body membrane fixation technology can fix the patient's lower limbs to a certain extent, as the patient receives radiotherapy for a long time, the weight may change, resulting in a decrease in the fit between the body membrane and the patient's lower limbs, which in turn affects the stability and accuracy of fixation. Vacuum pad fixation means first inflating the vacuum pad to soften it, then placing the patient's body on the vacuum pad, and adjusting the shape of the vacuum pad while evacuating the vacuum pad to put the patient's body in an easily repeatable and comfortable position. When the gas in the vacuum pad is exhausted, the vacuum pad becomes hard and can fix the patient's body. However, this fixation method may cause discomfort to the patient if the lower limbs are kept still for a long time, which in turn causes the patient's legs and soles to unconsciously move slightly, and the laser cannot locate the line-drawing position for precise radiotherapy. In addition, for some pelvic diseases, the position of the legs open, the angle of the soles of the feet inward and outward rotation will affect the relative displacement of the patient's body surface marking line and the laser light. In order to solve the above problems, a lower limb fixation device for radiotherapy is proposed, which can sense the slight displacement caused by the patient's discomfort and enhance the fixation. Summary of the invention

[0004] To solve the above problems, the present invention provides a lower limb fixation device for radiotherapy, which provides lower limb fixation for patients through a foot fixation box and a leg fixation frame, while sensing the displacement of the patient's foot and leg, thereby fixing the patient's lower limbs.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a lower limb fixing device for radiotherapy, comprising a hollow bed board and a symmetrically arranged leg fixing frame, the leg fixing frames are all slidably connected to the bed board, a plurality of locking holes are opened on the top of the bed board, a plurality of first electric telescopic rods are fixedly connected to the bottom of the leg fixing frames, the leg fixing frames and the bed board are fixedly connected through the first electric telescopic rods and the locking holes, an airbag assembly is arranged in the leg fixing frames, a symmetrically arranged placement groove is opened on the side of the bed board close to the leg fixing frames, a foot fixing box is placed in the placement groove, a placement hole is arranged on the side of the bed board away from the placement groove, a second electric telescopic rod is rotatably connected in the placement hole, a rotating pin is fixedly connected to the top of the second electric telescopic rod, a side wall of the rotating pin is fixedly connected to the leg fixing frame, an angle sensor is arranged in the rotating pin, and the angle sensor signal is connected to the controller, a laser locator is detachably connected to the side of the bed board away from the placement groove, and the laser locator, the first electric telescopic rod and the second electric telescopic rod are all connected to the controller signal;

[0006] The sole fixing box is fixedly connected with an electromagnet partition with magnetism on both sides, the electromagnet partition is connected with the controller signal, the electromagnet partition divides the inside of the sole fixing box into an air cavity and a fixed cavity, the air cavity is provided with a sliding component for compressing air to the airbag component, the air cavity and the airbag component are connected with an air inlet pipe, the fixed cavity is provided with a plurality of rod components for increasing the fixing effect as the patient's sole contracts, and a rod frame component for changing the resistance according to the elastic deformation generated by the movement of the rod component and thereby measuring the size of the patient's sole, the rod frame component is fixed in the fixed cavity and connected with the controller signal, one end of the rod component passes through the fixed cavity and the rod frame component, extends to the outside of the sole fixing box, and is slidably connected with the sole fixing box.

[0007] The technical principle of the above scheme is as follows: when the patient is positioned by lying on the bed board, both legs are placed in the leg fixing frame, two foot fixing boxes are placed in the placement slot and close to the patient's feet, the position of the foot fixing box is adjusted according to the patient's leg length, and recorded, the patient's foot and the part of the rod assembly outside the foot fixing box contact and squeeze the rod assembly, by pushing a part of the rod assembly into the foot fixing box, the size of the patient's foot is recorded by the number of rod assemblies pushed in, and a line is drawn on the patient's lower limbs for positioning; when the treatment site is located on the left leg, during the positioning process, the patient places the right The legs are placed in the leg fixing frame, and the controller controls the extension of the first electric telescopic rod and the second electric telescopic rod, and drives the lifting plate to rise, so that the patient's right leg is raised and avoids the position where the radiation passes; when the patient needs to open his legs for treatment, the first electric telescopic rod is retracted from the locking hole to adjust the angle of the leg fixing frame. When the angle is fixed, the controller drives the first telescopic rod to extend into the locking hole to fix the leg fixing frame. At this time, the angle sensor obtains the rotation angle of the rotating pin and transmits it to the controller for recording, so that the same angle can be used for rapid fixation during subsequent radiotherapy.

[0008] During radiotherapy, the laser positioning device will present multiple points on the rod assembly of the foot fixation box according to the size of the patient's foot initially recorded by the rod assembly. The patient places the foot on the corresponding rod assembly position according to the positioned points, and pushes part of the rod assembly into the foot fixation box, while the rod assembly that is not pushed into the foot fixation box acts as a limiter for the patient's foot. During long-term treatment, if the patient feels discomfort in his legs, he will unconsciously displace his feet and legs. At this time, the rod assembly at the sole of the foot will feel the displacement of the foot and transmit it to the controller. The controller activates the electromagnet partition. The magnetic pole of the electromagnet partition close to the fixed cavity side repels each other with the rod assembly, squeezing the patient's foot so that its foot always remains in place. At the same time, the magnetic pole of the electromagnet partition close to the air cavity side also repels each other with the sliding assembly. The sliding assembly pushes the air in the air cavity through the air inlet pipe into the airbag assembly of the leg fixation frame. The airbag assembly inflates and squeezes the patient's leg to fix the patient's leg.

[0009] The above scheme has the following beneficial effects:

[0010] 1. In this solution, by adjusting the position of the sole fixation box and recording the number of rod assemblies pushed in, the device can be personalized according to the patient's specific sole size and leg length, ensuring that each patient can get the most suitable fixation, improving the comfort and accuracy of treatment; when the rod assembly is squeezed and pushed, the rod frame assembly is deformed, and its resistance or capacitance value changes according to the pressure, so that when the patient's sole pushes the rod assembly into the sole fixation box, it causes the current inside the rod frame assembly to change. The controller can read the change in voltage or current inside the rod frame assembly and convert it into a digital signal. By reading these voltage or current values, the pressure distribution of the sole on the rod assembly can be roughly inferred, thereby indirectly measuring the contour of the patient's sole and recording the sole size data for comparison during multiple radiotherapy sessions.

[0011] 2. In this solution, the rod assembly in the device can sense the slight displacement of the patient's foot and respond in real time through the controller. When the displacement is detected, the electromagnet partition is activated, and the principle of magnetic pole repulsion is used to squeeze the patient's foot to keep it in place, and to push the sliding assembly to inflate the airbag assembly to further fix the patient's leg. This intelligent sensing and instant reinforcement mechanism helps reduce the discomfort caused by patients maintaining the same posture for a long time, while ensuring stability during treatment.

[0012] 3. In this solution, the rod assembly in the fixed cavity is not only used to fix the patient's foot, but also squeezes the patient's foot due to the mutual repulsion of the electromagnet partition, thereby realizing the massage function. During radiotherapy, proper massage can promote blood circulation, reduce the fatigue of the patient's feet, and improve the comfort of treatment.

[0013] 4. This scheme, by accurately fixing the patient's lower limbs, helps to position the patient during repeated positioning, improves positioning accuracy, increases the local control rate of the tumor, and improves the overall treatment efficiency.

[0014] Furthermore, the airbag assemblies include airbag grooves arranged on both sides of the leg fixing frame, the airbag grooves are fixedly connected to the placement grooves, the inner walls of the airbag grooves are fixedly connected to airbags that fit the contour of the patient's legs, the airbags are connected to the air cavity through an air inlet pipe, a valve is connected between the airbag and the air inlet pipe, and the valve is connected to the controller signal.

[0015] Beneficial effects: When the air in the air cavity is discharged into the air inlet pipe, the controller opens the valve, and the gas enters the airbag, the airbag can fully expand and fit tightly to the patient's legs, and the valve is closed to provide the patient with a more stable and uniform fixation force. This design helps to reduce the patient's leg movement during radiotherapy and improve the accuracy and safety of treatment. In addition, the inflation part of the airbag will be adjusted according to the changes in the patient's leg shape. After inflation, the airbag can fit the patient's leg curve and reduce discomfort. At the same time, the softness of the airbag can also adapt to the leg pressure and comfort requirements of different patients, improving the comfort of treatment and patient acceptance. After sensing that the sole of the patient's foot is no longer displaced, the controller opens the valve again and discharges part of the gas in the airbag to reduce the squeezing of the airbag on the patient.

[0016] Furthermore, a plurality of buckle grooves are fixedly connected to the inner side walls of the placement grooves, buckles corresponding to the buckle grooves are provided on both sides of the sole fixing box, and a scale is marked on one side of the placement groove close to the buckle groove.

[0017] Beneficial effects: The scale on the buckle slot enables the patient to record the scale position during simulation positioning and obtain the patient's lower limb length at the same time. After recording the scale, the foot fixation box can be quickly and accurately positioned in the placement slot when the patient undergoes radiotherapy later. The buckle locks the foot fixation box, avoiding loosening or displacement of the fixation device of the foot fixation box due to patient movement or adjustment of position during radiotherapy.

[0018] Furthermore, the sliding assembly includes a magnetic plate, the top and bottom of the magnetic plate are respectively fixedly connected with sliders, the top wall and bottom wall of the air cavity are respectively provided with sliding grooves corresponding to the sliders, and the side walls of the magnetic plate are ringed with sealing rings for reducing air circulation on both sides of the magnetic plate.

[0019] Beneficial effects: The combination of the slider and the slide groove provides a stable sliding track for the magnetic plate, ensuring the smooth movement of the magnetic plate in the air cavity. When the electromagnet partition is activated and the magnetic poles repel each other, the magnetic plate can respond and move quickly, pushing the air in the air cavity into the air bag through the air inlet pipe. This rapid response capability helps ensure that the lower limb fixation device can be quickly reinforced when the patient's leg is displaced, improving the stability and safety of treatment.

[0020] Furthermore, the rod assemblies all include a plastic rod, one end of the plastic rod located in the fixed cavity is fixedly connected to a magnet block, one end of the magnet block away from the plastic rod is fixedly connected to a plastic spring, and one end of the plastic spring away from the magnet block is fixedly connected to the electromagnet partition.

[0021] Beneficial effects: The combination of the magnet block and the electromagnet partition enables the rod assembly to intelligently respond to changes in the electromagnet partition. When the electromagnet partition is activated and produces magnetic pole repulsion, the magnet block will be subjected to repulsive force, which is then transmitted to the patient's foot through the plastic rod to reinforce the patient's foot. The material of the plastic rod ensures that the radiotherapy equipment is not affected during radiotherapy. The plastic spring is not affected by the electromagnet partition in the fixed cavity, and after the patient's treatment is completed, the plastic spring resets the squeezed plastic rod.

[0022] Furthermore, the rod frame assembly includes a plurality of rod frames and elastic conductive elements, adjacent rod frames are fixedly connected, a plurality of first rod holes are opened on the rod frames, a plurality of second rod holes are opened on the side of the sole fixing box close to the fixing cavity, and the other end of the plastic rod passes through the first rod hole and the second rod hole and extends to the outside of the sole fixing box.

[0023] Beneficial effect: Since one end of the plastic rod is fixedly connected to the plastic spring, the first rod hole on the rod frame and the second rod hole on the sole fixing box provide a guide for the plastic rod, so that the trajectory of the plastic rod will not be displaced when it is squeezed, and the distribution setting of multiple rod frames also divides the plastic rod. When measuring the size of the patient's sole, the patient's sole data can be obtained by pushing the plastic rods of different rod frames.

[0024] Furthermore, one end of the plastic rod located outside the sole fixing box is fixedly connected to a massage ball.

[0025] Beneficial Effects: The massage ball rolls on the plastic rod as the patient moves slightly, producing a gentle massaging effect on the soles of the feet and surrounding muscles, helping to relax tense muscles and reduce discomfort during radiotherapy.

[0026] Furthermore, the elastic conductive elements are fixedly connected to the first rod hole and the second rod hole, and the elastic conductive elements are connected to the controller signal.

[0027] Beneficial effects: As the plastic rod moves, the elastic conductive elements fixedly connected to the first rod hole and the second rod hole will be squeezed, thereby generating an electrical signal. The size of this electrical signal is proportional to the pressure applied to the elastic conductive element, so it can reflect the thrust of the sole of the foot on the plastic rod. When the pressure increases, the elastic conductive element is stretched, and the resistance inside the elastic conductive element increases, thereby changing the current or voltage in the circuit. The controller can receive and process these signals in real time. By analyzing the changes in the sliding elastic conductive element, the controller can calculate the thrust distribution of the sole of the foot on the plastic rod. Since different parts of the sole of the foot have different thrusts on the plastic rod, the approximate shape and size of the sole of the foot can be inferred by analyzing the thrust distribution. The controller can process these data into a two-dimensional or three-dimensional graphic representation to record the condition of the patient's sole and compare the size of the patient's sole during multiple radiotherapy sessions for analysis.

[0028] In addition, the pressure on the sole of the patient's foot can be monitored in real time based on the deformation resistance of the elastic conductive element. When the pressure changes, the elastic conductive element transmits the resistance change data to the controller to obtain feedback, and then starts the electromagnetic partition to make the plastic rod squeeze and fix the patient's foot. When the resistance data obtained by the elastic conductive element tends to the resistance data during simulated positioning, the electromagnetic partition stops squeezing, so that the sole fixing box and the leg fixing frame reset the fixation state of the patient.

[0029] Furthermore, the outer shell of the sole fixing box is made of tungsten alloy.

[0030] Beneficial effect: The shielding ability of tungsten alloy ensures that the magnetic field generated by the internal electromagnet partition will not interfere with the outside world, thereby protecting the stability of the magnetic field inside the sole fixing box.

[0031] Furthermore, an airbag strap that fits the shape of the patient's instep is provided on the sole fixing box, and two ends of the airbag strap are respectively connected to two sides of the air cavity.

[0032] Beneficial effects: When the magnetic plate in the air cavity is squeezed, the airbag strap generates a certain pressure by inflating the two ends, tightly connecting the sole fixation box to the patient's sole, thereby improving the stability of the sole fixation box on the patient's sole. This helps to reduce the movement of patients during radiotherapy and ensure the accuracy and safety of radiotherapy. In addition, the airbag strap can limit the patient's sole when it is pushed and squeezed by the plastic rod, so that the sole of the foot will not be displaced due to the push of the plastic rod, further fixing the patient's lower limbs. At the same time, the airbag strap also gently massages the patient's instep during the inflation process, which helps to promote blood circulation and relieve muscle fatigue. For patients who need to keep their feet perpendicular to the bed board during long-term radiotherapy, this can reduce foot discomfort caused by long-term fixation.

[0033] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A side cross-sectional view of an embodiment of a lower limb fixation device for radiotherapy of the present invention;

[0035] Figure 2 It is an axonometric schematic diagram of a bed board and a leg fixing frame of an embodiment of a lower limb fixing device for radiotherapy of the present invention;

[0036] Figure 3 This is an axonometric schematic diagram of a foot fixation box of an embodiment of a lower limb fixation device for radiotherapy of the present invention.

[0037] The figure marks in the drawings of the specification include: 1. foot fixing box; 2. air cavity; 3. magnetic plate; 4. electromagnet partition; 5. fixing cavity; 6. air intake pipe; 7. bed board; 8. valve; 9. airbag; 10. plastic spring; 11. leg fixing frame; 12. plastic rod; 13. airbag groove; 14. placement groove; 15. buckle groove; 16. airbag strap; 17. rotating pin; 18. placement hole. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] The following is further described in detail through specific implementation methods:

[0042] Example:

[0043] As attached Figure 1 , Figure 2 and Figure 3 As shown: a lower limb fixation device for radiotherapy, including a hollow bed board 7 and symmetrically arranged leg fixation frames 11, the leg fixation frames 11 are slidably connected to the bed board 7, a plurality of locking holes are opened on the top of the bed board 7, and a plurality of first electric telescopic rods are fixedly connected to the bottom of the leg fixation frames 11, and the leg fixation frames 11 and the bed board 7 are fixedly connected through the first electric telescopic rods and the locking holes.

[0044] The leg fixing frame 11 is provided with an airbag assembly, and the airbag assembly includes an airbag groove 13 arranged on both sides of the leg fixing frame 11, the airbag groove 13 is connected to the placement groove 14, and the inner wall of the airbag groove 13 is fixedly connected with an airbag 9 that fits the contour of the patient's leg. The bed board 7 is provided with a symmetrical placement groove 14 on one side close to the leg fixing frame 11, and a plurality of buckle grooves 15 are fixedly connected to the inner wall of the placement groove 14. Buckles corresponding to the buckle groove 15 are provided on both sides of the sole fixing box 1, and a scale is marked on one side of the placement groove 14 close to the buckle groove 15. The sole fixing box 1 is placed in the placement groove 14, and the outer shell of the sole fixing box 1 is made of tungsten alloy material, which can shield the magnetic field generated by the internal electromagnet partition 4 and protect the internal circuit from the influence of radiotherapy scattered rays.

[0045] A placement hole 18 is provided on the side of the bed board 7 away from the placement slot 14, and a second electric telescopic rod is rotatably connected in the placement hole 18. A rotating pin 17 is fixedly connected to the top of the second electric telescopic rod. The side wall of the rotating pin 17 is fixedly connected to the leg fixing frame 11. An angle sensor is provided in the rotating pin 17, and the angle sensor signal is connected to the controller. A laser locator is detachably connected to the side of the bed board 7 away from the placement slot 14, and the laser locator, the first electric telescopic rod and the second electric telescopic rod are all connected to the controller signal.

[0046] An electromagnet partition 4 with magnetism on both sides is fixedly connected in the sole fixing box 1, and the signal of the electromagnet partition 4 is connected to the controller. The electromagnet partition 4 divides the sole fixing box 1 into an air cavity 2 and a fixed cavity 5. A sliding component for compressing air to the airbag component is provided in the air cavity 2. The sliding component includes a magnetic plate 3. Slide blocks are fixedly connected to the top and bottom of the magnetic plate 3 respectively. The top wall and the bottom wall of the air cavity 2 are respectively provided with sliding grooves corresponding to the sliding blocks. The connection between the sliding groove and the magnetic plate 3 divides the air cavity 2 into two closed chambers. An air inlet pipe 6 is connected between the air cavity 2 and the airbag 9. A valve 8 is connected between the airbag 9 and the air inlet pipe 6. The valve 8 is connected to the controller signal.

[0047] The fixing cavity 5 is provided with a plurality of rod assemblies for increasing the fixing effect as the sole of the patient contracts, and a rod frame assembly for changing the resistance according to the elastic deformation generated by the movement of the rod assembly and thereby measuring the size of the patient's sole. The rod frame assembly is fixed in the fixing cavity 5 and connected to the controller signal. One end of the rod assembly passes through the fixing cavity 5 and the rod frame assembly, extends to the outside of the sole fixing box 1, and is slidably connected to the sole fixing box 1.

[0048] The rod assemblies all include a plastic rod 12, one end of the plastic rod 12 located in the fixed cavity 5 is fixedly connected to a magnet block, the end of the magnet block away from the plastic rod 12 is fixedly connected to a plastic spring 10, and the end of the plastic spring 10 away from the magnet is fixedly connected to the electromagnet partition 4.

[0049] The rod frame assembly includes a plurality of rod frames and elastic conductive elements. Adjacent rod frames are fixedly connected. A plurality of first rod holes are opened on the rod frames. A plurality of second rod holes corresponding to the first rod holes are opened on the side of the sole fixing box 1 close to the fixing cavity 5. The other ends of the plastic rods 12 pass through the first rod holes and the second rod holes and extend to the outside of the sole fixing box 1. The elastic conductive elements are fixedly connected to the first rod holes and the second rod holes. The elastic conductive elements are connected to the controller signal. The end of the plastic rod 12 located outside the sole fixing box 1 is fixedly connected to a massage ball.

[0050] The sole fixing box 1 is provided with an air bag strap 16 that fits the shape of the patient's instep, and two ends of the air bag strap 16 are respectively connected to two sides of the air cavity 2.

[0051] The specific implementation process is as follows: before radiotherapy, it is usually necessary to simulate the positioning of the patient. The patient lies on the bed board 7 and places both legs in the leg fixing frame 11. When the treatment area is located on the left leg, during the positioning process, the patient places the right leg in the leg fixing frame 11, and the controller controls the first electric telescopic rod and the second electric telescopic rod to extend, and raise the leg fixing frame 11 where the right leg is placed, so that the patient's right leg is raised and avoids the position where the rays pass; when the patient needs to open his legs for treatment, the first electric telescopic rod is retracted from the locking hole to adjust the angle of the leg fixing frame 11. When the angle is fixed, the controller drives the first telescopic rod to extend into the locking hole to fix the leg fixing frame 11, and at this time the angle sensor obtains the angle of the rotating pin 17 and transmits it to the controller for recording, so that the same angle can be used for rapid fixation during subsequent radiotherapy.

[0052] Place the two sole fixing boxes 1 in the placement slot 14 and close to the sole of the patient's foot, adjust the position of the sole fixing box 1 according to the patient's leg length, record the position through the scale on one side of the buckle slot 15, and obtain or the length of the lower limb at the same time, so as to record the data for comparison when the patient's lower limb condition changes; the patient's sole contacts and squeezes the plastic rod 12 located outside the sole fixing box 1, and the plastic rod 12 is squeezed by pushing a part of the plastic rod 12 into the sole fixing box 1. The rod rack distribution in the sole fixing box 1 also divides the plastic rod 12 into different zones. When measuring the size of the patient's foot, the plastic rod 12 that can be pushed by different rod racks can be pushed. As the plastic rod 12 moves, the elastic conductive elements fixedly connected to the first rod hole and the second rod hole will be squeezed, thereby generating an electrical signal. The size of this electrical signal is proportional to the pressure applied to the elastic conductive element, so it can reflect the thrust of the sole of the foot on the plastic rod. When the pressure increases, the elastic conductive element will be squeezed. When the conductive element is stretched, the resistance inside the elastic conductive element increases, thereby changing the current or voltage in the circuit. The controller can receive and process these signals in real time. By analyzing the changes in the sliding elastic conductive element, the controller can calculate the thrust distribution of the sole of the foot on the plastic rod 12. Since different parts of the sole of the foot have different thrusts on the plastic rod 12, the approximate shape and size of the sole of the foot can be inferred by analyzing the thrust distribution. The controller can process these data into two-dimensional or three-dimensional graphical representations to record the condition of the patient's sole and compare and analyze the size of the patient's sole during multiple radiotherapy sessions. The pressure exerted by the plastic rod 12 on the patient's sole can be monitored in real time based on the deformation resistance of the elastic conductive element. Combined with the partitioned rod frame, the precise data of the patient's foot size can be further accurately obtained and recorded, and the line drawing method is used to perform laser positioning on the patient's lower limbs to facilitate subsequent radiotherapy.

[0053] During the subsequent radiotherapy, when the patient lies on the bed board 7 again, the placement position of the foot fixation box 1 can be accurately and quickly found and locked according to the scale position of the buckle groove 15, thereby preventing the foot fixation box 1 from loosening or shifting due to the patient's movement or adjustment of position during radiotherapy. The laser locator will present multiple points on the rod assembly of the foot fixation box 1 according to the two-dimensional graphic outline of the patient's foot size recorded for the first time. The patient places the foot on the corresponding plastic rod 12 position according to the located point, and pushes this part of the plastic rod 12 into the foot fixation box 1 again to achieve rapid positioning. By comparing the previous foot position record, the lower limb placement position during simulated positioning can be accurately found, and the plastic rod 12 that has not been pushed into the foot fixation box 1 acts as a limiter for the patient's foot.

[0054] In the case of long-term treatment, if the patient feels discomfort in the legs, the soles of the feet and legs will be unconsciously displaced. At this time, the movement of the soles of the feet of the plastic rod 12 can squeeze and deform the elastic conductive element. At this time, the elastic conductive element transmits the data to the controller according to the change of its internal resistance. The controller starts the electromagnet partition 4. The magnetic poles of the electromagnet partition 4 close to the side of the fixed cavity 5 repel each other with the magnet block, thereby squeezing the plastic rod 12 to keep the patient's soles in place at all times, thereby reinforcing the patient's soles. The material of the plastic rod 12 ensures that the radiotherapy equipment is not affected during radiotherapy. When the patient's soles are unconsciously displaced, the massage ball rolls on the plastic rod 12 with the patient's slight movement, producing a gentle massage effect on the soles of the feet and surrounding muscles, which helps to relax tense muscles and reduce discomfort during radiotherapy.

[0055] At the same time, the magnetic pole of the electromagnet partition 4 close to the air cavity 2 and the magnetic plate 3 also repel each other, and the magnetic plate 3 pushes the air in the air cavity 2. When the air in the air cavity 2 is discharged into the air inlet pipe 6, the controller opens the valve 8. When the patient's foot is fixed, the instep fits the concave part of the airbag strap 9. When the gas enters the airbag 9, the airbag 9 can fully expand and fit the patient's leg tightly. The valve 8 is closed to provide the patient with a more stable and uniform fixing force, and the inflation part of the airbag 9 will be adjusted according to the change of the patient's leg shape. After inflation, the airbag 9 can fit the patient's leg curve to reduce discomfort. At the same time, the softness of the airbag 9 can also adapt to the leg pressure and comfort requirements of different patients, improve the comfort of treatment and the patient's acceptance. After sensing that the patient's foot is no longer displaced, the controller opens the valve 8 again and discharges part of the gas in the airbag 9 to reduce the squeezing of the airbag 9 on the patient.

[0056] In addition, when the magnetic plate 3 and the electromagnet partition 4 in the air cavity 2 repel each other, another part of the air in the air cavity 2 enters the airbag strap 16, and a certain pressure is generated by inflating the two ends. Since the instep of the patient's foot fits the concave part of the airbag strap 12 when the patient's foot is fixed, after inflation, the airbag strap 16 tightly connects the foot fixing box 1 with the patient's foot, thereby improving the stability of the foot fixing box 1 to the patient's foot. In addition, the airbag strap 16 plays a limiting role when the patient's foot is pushed and squeezed by the plastic rod 12, so that the foot will not be displaced due to the push of the plastic rod 12, further fixing the patient's lower limbs. At the same time, the airbag strap 16 also gently massages the instep of the patient during the inflation process, which helps to promote blood circulation and relieve muscle fatigue. This can alleviate the foot discomfort caused by long-term fixation for patients who need to make their feet perpendicular to the bed board 7 for long-term radiotherapy.

[0057] When the resistance data obtained by the elastic conductive element approaches the data during simulation positioning, the electromagnet partition 4 stops squeezing, so that the sole fixing box 1 and the leg fixing frame 11 reset the patient's fixed state. After the patient's treatment is completed, the plastic spring 10 resets the squeezed plastic rod 12.

[0058] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A lower limb fixation device for radiotherapy, comprising a hollow bed board (7) and a symmetrically arranged leg fixation frame (11), characterized in that: The leg fixing frames (11) are all slidably connected to the bed board (7), the top of the bed board (7) is provided with a plurality of locking holes, the bottom of the leg fixing frames (11) are all fixedly connected with a plurality of first electric telescopic rods, the leg fixing frames (11) and the bed board (7) are fixedly connected through the first electric telescopic rods and the locking holes, an airbag assembly is arranged in the leg fixing frames (11), a symmetrical placement groove (14) is arranged on one side of the bed board (7) close to the leg fixing frames (11), a foot fixing box (1) is placed in the placement groove (14), and the bed board (7) is away from the leg fixing frames (11). A placement hole (18) is provided on one side of the placement slot (14), a second electric telescopic rod is rotatably connected in the placement hole (18), a rotation pin (17) is fixedly connected to the top of the second electric telescopic rod, a side wall of the rotation pin (17) is fixedly connected to the leg fixing frame (11), an angle sensor is provided in the rotation pin (17), and the angle sensor signal is connected to the controller, a laser locator is detachably connected to the side of the bed board (7) away from the placement slot (14), and the laser locator, the first electric telescopic rod and the second electric telescopic rod are all connected to the controller signal; The foot fixing box (1) is fixedly connected with an electromagnet partition (4) having magnetism on both sides. The electromagnet partition (4) is connected to a controller signal. The electromagnet partition (4) divides the foot fixing box (1) into an air chamber (2) and a fixing chamber (5). The air chamber (2) is provided with a sliding assembly for compressing air to an air bag assembly. An air inlet pipe (6) is connected between the air chamber (2) and the air bag assembly. The fixing chamber (5) is provided with a plurality of rod assemblies for increasing the fixing effect as the foot of the patient contracts and a rod frame assembly for changing resistance according to elastic deformation generated by the movement of the rod assemblies and thereby measuring the size of the foot of the patient. The rod frame assembly is fixed in the fixing chamber (5) and connected to the controller signal. One end of the rod assembly passes through the fixing chamber (5) and the rod frame assembly, extends to the outside of the foot fixing box (1), and is slidably connected to the foot fixing box (1).

2. The lower limb fixation device for radiotherapy according to claim 1, characterized in that: The airbag components all include airbag grooves (13) arranged on both sides of a leg fixing frame (11), the airbag grooves (13) are fixedly connected to a placement groove (14), an airbag (9) that fits the contour of a patient's leg is fixedly connected to the inner wall of the airbag groove (13), the airbag (9) is connected to the air cavity (2) through an air inlet pipe (6), a valve (8) is connected between the airbag (9) and the air inlet pipe (6), and the valve (8) is connected to a controller signal.

3. The lower limb fixation device for radiotherapy according to claim 2, characterized in that: The inner side wall of the placement groove (14) is fixedly connected with a plurality of buckle grooves (15), buckles corresponding to the buckle grooves (15) are provided on both sides of the sole fixing box (1), and a scale is marked on one side of the placement groove (14) close to the buckle groove (15).

4. The lower limb fixation device for radiotherapy according to claim 3, characterized in that: The sliding assembly comprises a magnetic plate (3), the top and bottom of the magnetic plate (3) are respectively fixedly connected with sliding blocks, the inner top wall and the inner bottom wall of the air cavity (2) are respectively provided with sliding grooves corresponding to the sliding blocks, and the side walls of the magnetic plate (3) are ring-shaped with sealing rings for reducing air circulation on both sides of the magnetic plate (3).

5. The lower limb fixation device for radiotherapy according to claim 4, characterized in that: The rod assemblies all include a plastic rod (12), one end of the plastic rod (12) located in the fixed cavity (5) is fixedly connected to a magnet block, one end of the magnet block away from the plastic rod (12) is fixedly connected to a plastic spring (10), and one end of the plastic spring (10) away from the magnet block is fixedly connected to an electromagnet partition (4).

6. The lower limb fixation device for radiotherapy according to claim 5, characterized in that: The rod frame assembly comprises a plurality of rod frames and elastic conductive elements. Adjacent rod frames are fixedly connected. A plurality of first rod holes are formed on the rod frames. A plurality of second rod holes are formed on a side of the sole fixing box (1) close to the fixing cavity (5). The other end of the plastic rod (12) passes through the first rod hole and the second rod hole and extends to the outside of the sole fixing box (1).

7. The lower limb fixation device for radiotherapy according to claim 6, characterized in that: One end of the plastic rod (12) located outside the sole fixing box (1) is fixedly connected to a massage ball.

8. The lower limb fixation device for radiotherapy according to claim 7, characterized in that: The elastic conductive elements are fixedly connected to the first rod hole and the second rod hole, and the elastic conductive elements are connected to the controller signal.

9. The lower limb fixation device for radiotherapy according to claim 8, characterized in that: The outer shell of the sole fixing box (1) is made of tungsten alloy.

10. The lower limb fixation device for radiotherapy according to claim 9, characterized in that: An air bag bandage (16) that fits the shape of the patient's instep is provided on the sole fixing box (1), and two ends of the air bag bandage (16) are respectively connected to two sides of the air cavity (2).

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