A patient position fixing device for tumor radiotherapy

Abstract

The patent application discloses a patient position fixing device for tumor radiotherapy, and particularly relates to the field of position fixing device. The device comprises a bed body, a groove is formed in the bed body, a support plate is arranged in the groove, an air pipe is slidably connected between the bed body and the support plate, an inflation pump is arranged in the middle of the air pipe, a gas guide cylinder is connected to the same air pipe, a fixed main pipe is connected to the gas guide cylinder, a fixed branch pipe is connected to the fixed main pipe, a first push rod is slidably and sealingly connected in the fixed main pipe and the fixed branch pipe, a flexible pad is arranged on the fixed main pipe and the fixed branch pipe, and an auxiliary fixing assembly is arranged to fix the arms or legs. The device solves the problem that the existing patient position fixing device for tumor radiotherapy cannot be reused, and is beneficial to fixing the patient position and reducing the treatment cost.

Description

Technical Field

[0001] This invention relates to the field of body positioning devices, and particularly to a body positioning device for patients undergoing radiotherapy for tumors. Background Technology

[0002] As a core component of modern comprehensive cancer treatment, the precision of radiotherapy is directly related to the stability of patient positioning. During radiotherapy, radiation must be precisely focused on the tumor target area while minimizing radiation damage to surrounding normal tissues. This places extremely high demands on the accuracy of repeated patient positioning. Currently, thermoplastic films are widely used for local fixation in clinical practice, but this method has significant limitations: although thermoplastic films can be shaped and conform to the patient's body contours through heating, their standardized production process makes it difficult to adapt the film thickness, elasticity, and fit to individual anatomical differences. This is especially true for obese, thin, or patients with complex body contours, often resulting in concentrated local pressure or insufficient fit. This not only increases the risk of pressure sores but also causes positioning errors exceeding clinical tolerances due to displacement of surface markers, directly affecting the accuracy of radiotherapy dose distribution. Furthermore, because thermoplastic films are molded in a single process, their structure is fixed and cannot be reshaped and reused, indirectly increasing the patient's treatment costs. Summary of the Invention

[0003] The present invention aims to provide a patient positioning fixation device for tumor radiotherapy, which solves the problem that existing patient positioning fixation devices for tumor radiotherapy cannot be reused.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: A patient positioning fixation device for tumor radiotherapy, comprising:

[0005] The bed frame has grooves formed on it;

[0006] A support plate, wherein the support plate is disposed within the groove;

[0007] Multiple ventilation pipes are slidably connected between the bed body and the support plate;

[0008] Multiple air pumps are provided, and each of the multiple air pumps is respectively located in the middle of a corresponding air pipe;

[0009] Multiple air guide tubes, with each pair of air guide tubes connected to the two ends of the same air pipe;

[0010] Multiple fixed main pipes, each of which is connected to a corresponding air guide tube;

[0011] Multiple fixed branch pipes, with every two fixed branch pipes connected to the same fixed main pipe;

[0012] Multiple first push rods are slidably and sealingly connected to the corresponding fixed main pipe and fixed branch pipe respectively;

[0013] Multiple flexible pads are respectively disposed on the fixed main pipe and two fixed branch pipes on the corresponding fixed main pipe;

[0014] Multiple auxiliary fixing components are respectively disposed on the fixing main tube, and the auxiliary fixing components are capable of keeping the arm or leg fixed.

[0015] Furthermore, the auxiliary fixing component includes a first connecting plate disposed on the fixing main tube, a connecting spring disposed on the first connecting plate, a second connecting plate disposed at the other end of the connecting spring, an elastic cloth connected between the second connecting plate and the first connecting plate, and two through holes opened on the first connecting plate, the two through holes being respectively located on the movement trajectory of the corresponding first push rod.

[0016] With the above setup, after the patient's arm or leg is placed on the elastic fabric, the elastic fabric moves downward under pressure to achieve a semi-coverage design for the arm or leg. At this time, under the action of the main fixing tube, the first connecting plate and the second connecting plate move towards the patient's body and make contact fixation. Simultaneously, under the action of the first push rod in the fixing branch tube, the corresponding first push rod uses the elastic fabric to make contact fixation between the patient's arm or leg and the second connecting plate, thereby achieving limb fixation and ensuring the fixation effect of the body position.

[0017] Furthermore, a slide rail is fixedly connected to the first connecting plate, and a slide rod is slidably connected within the slide rail. The two slide rods are fixedly connected to the second connecting plate, and the slide rods will never slip out of the slide rail during operation.

[0018] With the above configuration, the slide bar and slide rail can provide a certain support force for the second connecting plate, while maintaining the stability of the second connecting plate during its movement.

[0019] Furthermore, the connecting spring is located below the slide rail.

[0020] The above settings prevent the elastic fabric from deforming and interfering with the connecting spring, thus maintaining the stability of this solution.

[0021] Furthermore, each of the vent pipes is slidably sealed with two sealing plates, which are respectively located on both sides of the air pump; a return spring is connected between each sealing plate and the inner wall of the corresponding vent pipe; a limit hole is opened in the middle of each sealing plate; two limit rods are slidably connected in the limit hole; a compression spring is connected between the two limit rods; and the width of the air guide tube is greater than the width of the vent pipe.

[0022] With the above settings, after the sealing plate slides into the air guide cylinder, it can be locked at the end of the air pipe by means of the limiting rod and the compression spring. The sealing plate seals the air pipe, which can keep the air inside the air guide cylinder sealed while allowing air to pass through. This can maintain the thrust of the first push rod unchanged and enhance the reliability of this solution.

[0023] Furthermore, the air guide cylinder has a through hole, and a second push rod is slidably and sealingly connected inside the through hole, with the limiting rod located on the movement trajectory of the second push rod.

[0024] With the above setup, the limiting rod can be pushed back into the limiting hole with the help of the second push rod, so that the sealing plate can be reset under the action of the reset spring. At the same time, the second push rod can also be used to exhaust the air tube, which is beneficial to quickly release the fixation effect on the patient's body position after radiotherapy.

[0025] Furthermore, each of the fixed branch pipes is equipped with a solenoid valve, and the corresponding positions of the flexible plate and the second connecting plate are provided with a first pressure sensor electrically connected to the solenoid valve. When the first pressure sensor reaches a preset pressure value, it controls the solenoid valve to close via an electrical signal. The air guide cylinder is provided with a second pressure sensor electrically connected to the corresponding air pump.

[0026] With the above settings, the thrust of the first push rod inside the fixed branch pipe can be controlled by the first pressure sensor, while the corresponding air pump can be shut off by the second pressure sensor.

[0027] Furthermore, the bottom of the support plate is provided with a sliding groove, and a roller is slidably connected in each of the sliding grooves. The diameter of the roller is greater than the depth of the sliding groove. A rotating shaft passes through between two rollers. A connecting rod is provided between the rotating shaft and the corresponding vent pipe. The connecting rod is rotatably connected to the rotating shaft and fixedly connected to the vent pipe.

[0028] With the above setup, the position of the ventilation tube and air delivery tube can be easily adjusted using the rollers, allowing for adjustments based on different body types and patient positions, thus improving efficiency.

[0029] Compared with existing technologies, the beneficial effects of this solution are:

[0030] 1. This design utilizes a sliding groove, rollers, and connecting rods to move the ventilation tube, thereby enabling adjustment of the flexible pad and auxiliary fixation components. This allows for flexible placement of fixation points based on the patient's height, weight, and surface curvature, effectively addressing the issue of insufficient fit for patients with specific body types (such as obesity, thinness, or spinal deformities). This dynamic adaptation design not only reduces the risk of pressure sores caused by concentrated local pressure but also enhances positioning stability through multi-point uniform support, providing structural assurance for the precision of radiotherapy dose distribution.

[0031] 2. This solution uses an air pump to regulate the internal air pressure of the air delivery cylinder, main fixing tube, and branch fixing tube, thereby controlling the thrust of the first push rod and achieving coordinated fixation of multiple sites. For example, the auxiliary fixation component, through the linkage design of the elastic cloth and the second push rod, achieves semi-coverage fixation of the arm or leg. Simultaneously, the relative movement of the first and second connecting plates forms a three-dimensional support, effectively suppressing minor displacements caused by muscle fatigue or respiratory movements during treatment. This combination of overall stability and local flexibility significantly reduces repetitive positioning errors and avoids the risk of missed irradiation of the target area or overdose of normal tissue due to insufficient local fixation.

[0032] 3. This solution utilizes a sealing plate and a return spring to dynamically maintain and rapidly release the air pressure within the air delivery cylinder. Before treatment, the internal pressure can be adjusted using an air pump; after treatment, the second push rod releases the seal and vents the gas, restoring the device to its initial state for future use. This design not only enables the reuse of the fixation device, reducing treatment costs for patients, but also achieves automated control of the fixed pressure through the intelligent linkage of the solenoid valve and pressure sensor, reducing the complexity of manual adjustments. Attached Figure Description

[0033] Figure 1 This is an isometric view of a patient positioning fixation device for tumor radiotherapy according to the present invention;

[0034] Figure 2 This is a top view of a patient positioning fixation device for tumor radiotherapy according to the present invention;

[0035] Figure 3 yes Figure 2 Sectional view of AA;

[0036] Figure 4 yes Figure 2 Sectional view of BB;

[0037] Figure 5 yes Figure 2 Sectional view of CC;

[0038] Figure 6 This is a front view of a patient positioning fixation device for tumor radiotherapy according to the present invention;

[0039] Figure 7 yes Figure 6 A sectional view of DD.

[0040] The reference numerals in the accompanying drawings of the instruction manual include: bed body 1, support plate 2, roller 3, rotating shaft 4, sleeve 5, connecting rod 6, T-slot 7, slider 8, air pipe 9, fixing plate 10, air hole 11, return spring 12, sealing plate 13, limit rod 14, compression spring 15, guide groove 16, second push rod 17, air pump 18, diverter block 19, controller 20, air guide tube 21, fixed main pipe 22, fixed pipe 23, fixed branch pipe 24, first push rod 25, flexible pad 26, first connecting plate 27, connecting spring 28, second connecting plate 29, elastic cloth 30, slide rail 31, solenoid valve 32, first pressure sensor 33, and second pressure sensor 34. Detailed Implementation

[0041] The present invention will be further described in detail below through specific embodiments:

[0042] Example

[0043] like Figures 1 to 7 As shown, a patient positioning device for tumor radiotherapy includes:

[0044] The bed body 1 has a groove in the middle. The bed body 1 can be a fixed bed body 1 as in this embodiment, or a bed body 1 with lifting function.

[0045] A support plate 2 is positioned within a groove. Slide grooves are formed on both sides of the bottom of the support plate 2, each groove penetrating two opposite sidewalls. Rollers 3 are slidably connected within each groove; the diameter of the rollers 3 is greater than the depth of the groove and the height of the ventilation tube 9, thus providing support for the support plate 2 and the ventilation tube 9, facilitating adjustment of the ventilation tube 9's position. A rotating shaft 4 passes through the center of the two rollers 3, with a sleeve 5 covering the middle of the shaft 4. A connecting rod 6 is fixedly connected between the sleeve 5 and the corresponding ventilation tube 9. A T-slot 7 is also formed at the bottom center of the support plate 2, with a slider 8 fixedly connected to each sleeve 5. The slider 8 slidably connects within the T-slot 7, ensuring that the rotating shaft 4, rollers 3, and support plate 2 function as a single unit during operation, guaranteeing the stability of the device. In this embodiment, the number of rollers 3 is twice the number of ventilation tubes 9, with the appropriate number of tubes 9 selected based on the patient's actual need for fixation.

[0046] Multiple vent pipes 9 are slidably connected between the bed body 1 and the support plate 2. In this embodiment, each vent pipe 9 is fixedly connected to two fixing plates 10 located on both sides of the air pump 18. Each fixing plate 10 has a vent hole 11 in its center and a return spring 12 connected to each fixing plate 10. The free end of the return spring 12 is fixedly connected to a sealing plate 13 that is slidably sealed to the inner wall of the vent pipe 9. Each sealing plate 13 has a limiting hole in the middle of its upper side wall. The limiting hole penetrates two opposite side walls of the sealing plate 13. Two limiting rods 14 are slidably connected in the limiting hole. A compression spring 15 is connected between the two limiting rods 14. When the two limiting rods 14 are simultaneously inside the sealing plate 13, the compression spring 15 is in a compressed state. The elastic force of the compression spring 15 can keep the ends of the two limiting rods 14 simultaneously outside the sealing plate 13. The width of the air guide cylinder 21 is greater than the width of the air pipe 9. Each air guide cylinder 21 has two symmetrical guide grooves 16 on its lower side, and the guide grooves 16 are located on the movement trajectory of the limiting rod 14. A through hole is opened on the guide groove 16, penetrating the side wall of the air guide cylinder 21. A second push rod 17 is slidably and sealed in the through hole, and the limiting rod 14 is located on the movement trajectory of the second push rod 17.

[0047] Multiple air pumps 18 are provided, the number of which is the same as the number of air pipes 9. Each air pump 18 is positioned in the middle of its corresponding air pipe 9. The air inlet of each air pump 18 is connected to the outside, and the air outlet faces the middle of the inner top wall of the air pipe 9. A triangular diverter block 19 is located in the middle of the inner top wall of the air pipe 9, which helps to evenly distribute air to the air guide cylinders 21 on both sides. All air pumps 18 are electrically connected to a controller 20, which is mounted on the bed body 1. The controller 20 controls the opening and closing of each air pump 18.

[0048] Multiple air guide tubes 21 are provided, with the number of air guide tubes 21 being twice the number of air pipes 9. Each pair of air guide tubes 21 is connected to the two ends of the same air pipe 9. Air outlets are provided on opposite sides of each pair of air guide tubes 21.

[0049] Multiple fixed main pipes 22, the number of which is twice the number of vent pipes 9, are connected to the air outlets on the corresponding air guide tubes 21.

[0050] Multiple fixed branch pipes 24, the number of fixed branch pipes 24 being four times the number of ventilation pipes 9, each pair of fixed branch pipes 24 being connected to the corresponding fixed main pipe 22 through a fixed pipe 23, the two fixed branch pipes 24 and the corresponding fixed main pipe 22 being located in the same plane and parallel to each other.

[0051] Multiple first push rods 25, the number of which is six times the number of vent pipes 9, are slidably and sealingly connected to the corresponding fixed main pipe 22 and fixed branch pipe 24.

[0052] Multiple flexible pads 26, the number of which is twice the number of ventilation tubes 9, are respectively installed on the fixed main pipe 22 and two fixed branch pipes 24 on the fixed main pipe 22.

[0053] Multiple auxiliary fixing components are respectively installed on the main fixing tube 22 to keep the arm or leg fixed. In this embodiment, the auxiliary fixing components include a first connecting plate 27 installed on the main fixing tube 22. Two connecting springs 28 are symmetrically arranged on both sides of the lower part of the first connecting plate 27, and each connecting spring 28 is located below the slide rail 31. The other ends of the two connecting springs 28 are connected to a second connecting plate 29. The second connecting plate 29 is made of flexible material. An elastic cloth 30 is connected between the upper part of the second connecting plate 29 and the upper part of the first connecting plate 27. Two through holes are opened on the first connecting plate 27, and the two through holes are respectively located on the movement trajectory of the corresponding first push rod 25. In this embodiment, two slide rails 31 are also fixedly connected to the lower middle part of the first connecting plate 27. A slide rod is slidably connected in each slide rail 31. The two slide rods are fixedly connected to the second connecting plate 29, and the slide rods will never slip out of the slide rails 31 during operation.

[0054] In this embodiment, each fixed branch pipe 24 is equipped with a solenoid valve 32 electrically connected to the controller 20. The corresponding positions of the flexible plate and the second connecting plate 292 are provided with a first pressure sensor 33 electrically connected to the solenoid valve 32. When the first pressure sensor 33 reaches the preset pressure value, it controls the solenoid valve 32 to close through an electrical signal. The air guide cylinder 21 is provided with a second pressure sensor 34 electrically connected to the corresponding air pump 18.

[0055] The working process of this embodiment is as follows:

[0056] Preoperative preparation: Medical staff select an appropriate number of ventilation tubes 9 and rollers 3 based on the patient's height, weight, and body surface characteristics. While providing support for the support plate 2, the position of the ventilation tubes 9 is adjusted by sliding the rollers 3 within the grooves. Because the rollers 3 lift the ventilation tubes 9 off the bed 1, the position of the ventilation tubes 9 can be adjusted even when the patient is lying on the support plate 2, thus ensuring precise alignment of the ventilation tubes 9 with the areas of the patient's body surface to be fixed (such as the trunk and limbs). At the same time, the rollers 3 and ventilation tubes 9 corresponding to the auxiliary fixation components are adjusted to the patient's limbs. At this time, the elastic fabric 30 is in a relaxed state, facilitating subsequent limb placement.

[0057] After the patient lies supine on the support plate 2 within the groove of the bed 1, medical staff assist in adjusting the ventilation tube 9 to the required treatment position (such as supine or lateral), ensuring the approximate position is correct. Then, the air pump 18 within the corresponding ventilation tube 9 is activated via the controller 20. The air pump 18 draws outside air into the ventilation tube 9 and flows through the diverter block 19 to the air guide tubes 21 on both sides of the ventilation tube 9, before being diverted to the main pipe 22 and the branch pipe 24. As the air pressure in the main pipe 22 and the branch pipe 24 increases, the first push rod 25 slides within the main pipe 22 and the branch pipe, pushing the flexible pad 26 towards the patient. Utilizing the bending, deforming, and stretching properties of the flexible pad 26, it evenly conforms to the curved surface of the patient's torso or limbs, eliminating localized pressure concentration. When the pressure of the flexible pad 26 in contact with the patient's body surface reaches the preset threshold of the first pressure sensor 33, the solenoid valve 32 automatically closes, thereby maintaining the stable air pressure in the fixed branch pipe 24 and maintaining the pushing force of the first push rod 25 on the patient's body with the help of the flexible pad 26 in the fixed branch pipe 24.

[0058] When immobilizing the patient's limbs, after the patient's arms or legs are placed on the elastic fabric 30 of the second connecting plate 29, the elastic fabric 30 is pressed down by gravity, causing the second connecting plate 29 to move towards the first connecting plate 27. At this time, the first push rod 25 in the main fixing tube 22 pushes the first connecting plate 27 to move the second connecting plate 29 towards the patient's body. After the second connecting plate 292 comes into contact with the patient's body or the limbs come into contact with the body, the first push rods 25 in the two fixing branch tubes 24 on both sides of the main fixing tube 22 will press the limbs together through the first connecting plate 27, thereby completing the immobilization of the limbs. During this process, the slide rod slides along the slide rail 31 to ensure the smooth movement of the second connecting plate 29, while the connecting spring 28 helps to maintain the clamping effect between the first connecting plate 27 and the second connecting plate 29.

[0059] During the inflation process using the air pump 18, the air pressure pushes the sealing plate 13 to overcome the elastic force of the return spring 12 and slide into the air guide cylinder 21. The limiting rod 14, under the action of the compression spring 15, pops out and engages in the guide groove 16, preventing the sealing plate 13 from rebounding into the air pipe 9. Simultaneously, the air pressure also helps to continuously supply air into the air guide cylinder 21 by pushing the sealing plate 13, ensuring stable air pressure within the air guide cylinder 21. The second pressure sensor 34 inside the air guide cylinder 21 can monitor the internal air pressure in real time. When the preset pressure value is reached, the corresponding air pump 18 is shut off to maintain the stability of the fixed system.

[0060] During radiotherapy, this device uses multi-point uniform support (flexible trunk pad 26, limb auxiliary fixation components) to suppress minor displacements caused by the patient's breathing or muscle fatigue. The surface markers are fixed by uniform pressure, significantly reducing positioning errors and ensuring precise focusing of radiation on the tumor target area.

[0061] After treatment, push the second push rod 17 on the air delivery tube 21 to press the limiting rod 14 into the limiting hole of the sealing plate 13. Under the action of the return spring 12, the sealing plate 13 retracts into the air tube 9, and the air delivery tube 21 is connected to the outside to expel the air inside the air delivery tube 21. At this time, the internal air pressure of the fixed main tube 22 and the fixed branch tube 24 decreases, the first push rod 25 retracts, and the flexible pad 26 relaxes to release the fixation of the patient's position, allowing the patient to move freely.

[0062] This device solves the problems of poor fit and high cost of traditional thermoplastic films by dynamically adapting to patients of different body types and through pressure control and a reusable air pressure system, significantly improving the accuracy of radiotherapy positioning and the safety of treatment.

[0063] The above are merely embodiments of the present invention, and common knowledge such as specific structures and / or characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A patient positioning fixation device for tumor radiotherapy, characterized in that, include: The bed body (1) has a groove provided on it; Support plate (2), the support plate (2) is disposed in the groove; Multiple ventilation pipes (9) are slidably connected between the bed body (1) and the support plate (2); Multiple air pumps (18) are respectively arranged in the middle of the corresponding air pipes (9); Multiple air guide tubes (21), with each pair of air guide tubes (21) connected to the two ends of the same air pipe (9); Multiple fixed main pipes (22) are connected to corresponding air guide tubes (21); Multiple fixed branch pipes (24), with every two fixed branch pipes (24) connected to the same fixed main pipe (22); Multiple first push rods (25) are slidably and sealingly connected to the corresponding fixed main pipe (22) and fixed branch pipe (24); Multiple flexible pads (26) are respectively installed on the fixed main pipe (22) and two fixed branch pipes (24) on the corresponding fixed main pipe (22); Multiple auxiliary fixing components are respectively disposed on the fixing main tube (22), and the auxiliary fixing components are capable of keeping the arm or leg fixed; The auxiliary fixing component includes a first connecting plate (27) set on the fixing main tube (22), a connecting spring (28) is provided on the first connecting plate (27), a second connecting plate (29) is provided at the other end of the connecting spring (28), an elastic cloth (30) is connected between the second connecting plate (29) and the first connecting plate (27), and two through holes are opened on the first connecting plate (27), and the two through holes are respectively located on the movement trajectory of the corresponding first push rod (25).

2. The patient positioning fixation device for tumor radiotherapy according to claim 1, characterized in that: A slide rail (31) is fixedly connected to the first connecting plate (27), and a slide rod is slidably connected in the slide rail (31). The two slide rods are fixedly connected to the second connecting plate (29), and the slide rods will never slip out of the slide rail (31) during operation.

3. The patient positioning fixation device for tumor radiotherapy according to claim 2, characterized in that: The connecting spring (28) is located below the slide (31).

4. The patient positioning fixation device for tumor radiotherapy according to claim 1, characterized in that: Each of the vent pipes (9) is slidably sealed with two sealing plates (13), which are located on both sides of the air pump (18). Each sealing plate (13) is connected to the inner wall of the corresponding vent pipe (9) with a return spring (12). Each sealing plate (13) has a limit hole in the middle, and two limit rods (14) are slidably connected in the limit hole. A compression spring (15) is connected between the two limit rods (14). The width of the air guide tube (21) is greater than the width of the vent pipe (9).

5. A patient positioning fixation device for tumor radiotherapy according to claim 4, characterized in that: The air guide tube (21) has a through hole, and a second push rod (17) is slidably and sealed inside the through hole. The limiting rod (14) is located on the movement trajectory of the second push rod (17).

6. A patient positioning device for tumor radiotherapy according to any one of claims 2-5, characterized in that: Each of the fixed branch pipes (24) is equipped with a solenoid valve (32). The flexible pad (26) and the corresponding part of the second connecting plate (29) are provided with a first pressure sensor (33) electrically connected to the solenoid valve (32). When the first pressure sensor (33) reaches the preset pressure value, it controls the solenoid valve (32) to close through an electrical signal. The air guide cylinder (21) is provided with a second pressure sensor (34) electrically connected to the corresponding air pump (18).

7. A patient positioning device for tumor radiotherapy according to claim 6, characterized in that: The bottom of the support plate (2) is provided with a sliding groove, and a roller (3) is slidably connected in each of the sliding grooves. The diameter of the roller (3) is greater than the depth of the sliding groove. A rotating shaft (4) is provided between two rollers (3). A connecting rod (6) is provided between the rotating shaft (4) and the corresponding air pipe (9). The connecting rod (6) is rotatably connected to the rotating shaft (4) and fixedly connected to the air pipe (9).

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