Hand fixing device for radiotherapy

Abstract

The invention discloses a hand fixing device for radiotherapy, belongs to the technical field of medical equipment, and aims to solve the problems of poor repeatability and large error during existing radiotherapy. The nursing bed comprises a bed board, a bed frame and a driving device used for driving the bed board to move in the length direction of the bed frame, and a hand fixing device is arranged on the bed board and comprises an air bag, an air storage box, an upper clamping plate and a lower clamping plate; the air storage box is arranged at the top of the bed board, a piston is arranged in the air storage box, a connecting rod is arranged at the top of the piston and connected with the lower clamping plate, and the upper clamping plate is supported above the lower clamping plate through a support; the air bag is arranged on one side of the bed board and communicated with the air storage box through the first communicating pipe, and the driving device can extrude the air bag when driving the bed board to move. In the invention, in the moving process of the bed plate, the gas is filled into the gas storage tank, so that the lower clamping plate and the upper clamping plate are gradually close to each other to fix the arm of the patient, the error increase caused by pulling the shoulder by moving the hand of the patient is avoided, and the consistency of the positioning repeatability can be ensured.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and specifically relates to a hand fixation device for radiotherapy. Background Technology

[0002] Head and neck tumors and thoracic and abdominal tumors are common malignant tumors in clinical practice, with high morbidity and mortality rates. Investigations have revealed that these diseases often lack typical clinical manifestations in their early stages, and due to their insidious onset, they are frequently discovered in the middle or late stages. Radiotherapy, as a local treatment method, includes preventative, radical, and palliative approaches, primarily using external beam radiation. As radiotherapy becomes more standardized and precise, the requirements for fixation techniques are becoming increasingly stringent. Domestic reports indicate that inaccurate positioning during radiotherapy significantly increases the recurrence rate in radiotherapy patients. Simultaneously, reports suggest that improved fixation accuracy can reduce the MPTV (maximum dynamic range) extrapolation in intensity-modulated radiotherapy (IMRT) plans, thereby reducing irradiation of normal tissues. Therefore, only precise fixation techniques can truly realize the dose advantages and quality assurance of IRT. During radiotherapy, unfavorable patient conditions often lead to increased errors and poorer treatment outcomes. The hand position is not fixed for head and neck tumors, which can lead to uncertain shoulder position, poor repeatability, and thus affect the accuracy of the target area. For chest and abdominal tumors, patients need to raise both hands. Traditionally, patients raise both hands, grasp their elbows, and then place them on their foreheads. Because the hand position is different each time, it can also lead to inconsistent traction on the chest and abdomen. If this is done for too long, patients will not have enough strength in their hands, and their hands will move up, down, left, and right, resulting in poor repeatability, increased error, and poor comfort. Summary of the Invention

[0003] In view of this, the present invention provides a hand fixation device for radiotherapy to solve the problem that in existing radiotherapy, if the treatment time is too long, the patient's hand strength will be insufficient, and the hand will move up, down, left and right, resulting in poor repeatability and increased error.

[0004] The technical solution adopted in this invention is as follows:

[0005] A hand immobilization device for radiotherapy includes a bed board, a bed frame, and a drive device for moving the bed board along the length of the bed frame. The hand immobilization device is provided on the bed board and includes an airbag, an air reservoir, an upper clamp, and a lower clamp. The air reservoir is located on the top of the bed board, and a piston is slidably embedded in the air reservoir. A connecting rod is provided on the top of the piston, and the top of the connecting rod extends out of the air reservoir and connects to the lower clamp. The upper clamp is supported above the lower clamp by a bracket. The airbag is located on one side of the bed board and is connected to the air reservoir through a first connecting pipe. When the drive device moves the bed board, it can compress the airbag.

[0006] In this technical solution, the hand fixation device is located on both sides and behind the pillow pad of the bed board (in the prior art, a positioning plate is installed on the top of the radiotherapy bed board, meaning the arm fixation device in this solution can also be installed on the positioning plate). When it is necessary to fix the patient's forearm, the patient lies flat on the bed board, raises both hands, bends the forearms backward, and places the forearms on the top of the lower splint. Then, the operator starts the drive device, which drives the bed board to move into the radiotherapy device. During the movement, the airbag is compressed, and the gas in the airbag is forced into the gas storage tank due to pressure. As the air pressure inside the gas chamber increases, it pushes the piston upward. The upward movement of the piston causes the connecting rod and the lower clamp to move upward. After the lower clamp moves upward, the distance between the lower clamp and the upper clamp gradually decreases, gradually clamping the patient's arm. Once clamped, the patient can receive radiotherapy. In summary, this invention can effectively fix the patient's hand. During the movement of the bed board, gas is filled into the gas storage box, causing the lower and upper clamps to gradually come together to fix the patient's arm. This prevents the patient's hand from pulling on the shoulder, which would increase the error, and ensures consistent and repeatable positioning.

[0007] Preferably, both sides of the bed board in the width direction are provided with sliding grooves that slide with the bed frame; the driving device includes a gear, a rack and a motor, the rack is located in the sliding groove, the gear is rotatably connected to the bed frame, and the motor is located on the bed frame to drive the gear to rotate; the airbag is fixedly located on the bed frame and located in the sliding groove, and the airbag is located on one side in the length direction of the rack; a pressure plate is provided on the side of the rack facing the airbag.

[0008] In this technical solution, the drive device specifically includes a gear, a rack, and a motor. When it is necessary to drive the bed board to move, the motor is started, and the motor drives the gear to rotate. After the gear rotates, it drives the rack that meshes with it to move along the length of the bed board. Since the rack is connected to the bed board, the rack will drive the bed board to move. During the movement, the pressure plate on the rack will squeeze the air bag, thereby squeezing the gas in the air bag into the air exchange box.

[0009] Preferably, the gas storage tank has a conversion box and a temporary storage box on one side. The conversion box has a first through hole and a second through hole through its side wall. The conversion box has a valve for opening and closing the first through hole and the second through hole. A connecting rod is provided on one side of the valve, and the top of the connecting rod slides out of the conversion box. The end of the first connecting pipe away from the air bag is connected to the air exchange box. A second connecting pipe is provided at the first through hole and connected to the gas storage tank. A second connecting pipe is provided at the second through hole and connected to the temporary storage box. It also includes an automatic closing device. When the upper clamp and the lower clamp clamp the arm, the automatic closing device will drive the connecting rod to move, so that the valve closes the first through hole and opens the second through hole.

[0010] In this technical solution, it should be noted that since each patient's arm size is different, for patients with larger arms, only a small upward movement of the lower splint is needed to clamp them with the upper and lower splints. However, for patients with smaller arms, a larger upward movement of the lower splint is required to clamp them. During the movement of the bed board, the airbag is continuously compressed, causing the lower splint to rise continuously. But if it rises too far, it may pinch the patient's arm. Therefore, to solve this problem, this solution is equipped with an automatic closing device. In the initial state, the valve is located at the second through hole, at which time the second through hole is closed and the first through hole is open. When the patient's arm is clamped, the automatic closing device can drive the connecting rod to move downward, causing the valve to close the first through hole and open the second through hole. At this time, even if the bed board continues to move, the gas squeezed out of the airbag will enter the storage box through the second through hole, and the air pressure in the storage box remains consistent, so that the clamping force between the upper and lower splints remains constant, preventing injury to the patient.

[0011] Preferably, the support includes a top plate and a vertical rod, the top plate being positioned above the upper clamping plate, one end of the vertical rod being connected to the top plate, and the other end sliding through the upper clamping plate and connecting to the bed board, a first rubber airbag being provided between the top plate and the upper clamping plate; a groove being provided on one side of the connecting rod, the groove being located above the air exchange box; the automatic sealing device includes a transmission rod and a limiting block;

[0012] The limiting block is located in the groove. One end of the limiting block is elastically connected to the bottom of the groove through a second rubber airbag, and the other end extends out of the groove. The end of the limiting block away from the bottom of the groove has a notch. The top of the notch is inclined downward and the bottom is inclined upward. The transmission rod is located on one side of the upper clamping plate. The bottom of the transmission rod is rotatably connected to a pulley, which is located in the notch.

[0013] In this technical solution, it should be noted that when the upper clamp is pushed upward by the lower clamp a certain distance, that is, after the first rubber airbag is compressed to a certain length, it is considered that the patient's arm has been clamped. During the compression of the first rubber airbag, the transmission rod will rise, which will drive the pulley to rise. The rising pulley will squeeze the first inclined surface at the top of the notch of the limiting block, causing the limiting block to retract into the groove. After the limiting block retracts into the groove, the connecting rod is no longer limited and will descend due to gravity, causing the connecting rod to drive the valve downward to the first through hole, thus closing the first through hole and opening the second through hole. The gas squeezed out of the airbag enters the temporary storage box through the second through hole. During resetting, the second inclined surface at the bottom of the notch can be used to make the limiting block cooperate with the top wall of the air exchange box and retract into the groove again.

[0014] Preferably, the bottom of the connecting rod is provided with a mounting base, and a third rubber airbag is sleeved on the connecting rod. One end of the third rubber airbag is connected to the mounting base, and the other end is connected to the top of the inner cavity of the air exchange box.

[0015] In this technical solution, a third rubber airbag can provide elasticity to the connecting rod.

[0016] Preferably, a limiting plate is provided at the top of the connecting rod.

[0017] In this technical solution, the connecting rod can be limited by the setting of the limiting plate.

[0018] Preferably, a one-way valve is provided at the connection between the first connecting pipe and the air exchange box.

[0019] In this technical solution, a one-way valve is installed to prevent the gas in the gas storage tank from flowing back when the bed plate stops moving.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0021] In this invention, the patient's hand can be effectively fixed. During the movement of the bed board, gas is filled into the gas storage box, causing the lower and upper clamps to gradually come together to fix the patient's arm. This prevents the patient's hand from pulling on the shoulder and causing larger errors, and ensures consistent positioning repeatability. Attached Figure Description

[0022] The present invention will be described by way of example and with reference to the accompanying drawings, wherein:

[0023] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0024] Figure 2 This is a three-dimensional structural diagram of the bed board and bed frame of the present invention;

[0025] Figure 3 This is a three-dimensional structural diagram of the bed board and bed frame after cutting according to the present invention;

[0026] Figure 4 yes Figure 3 A side-view three-dimensional structural diagram;

[0027] Figure 5 This is the invention Figure 3 A schematic diagram of a partial three-dimensional structure;

[0028] Figure 6 This is a cross-sectional perspective view of the ventilation box of the present invention.

[0029] Figure Labels

[0030] 10-Radiotherapy device, 20-Bed frame, 21-Bed board, 211-Slide groove, 30-Hand fixation device, 31-Lower clamp, 32-Upper clamp, 33-Top plate, 331-Vertical rod, 332-First rubber airbag, 40-Air tank, 41-Piston, 42-Connecting rod, 50-Airbag, 51-Rack, 511-Pressure plate, 52-Gear, 53-First connecting pipe, 54-Air exchange box, 541-Second Connecting pipe, 542-Second through hole, 543-First through hole, 55-Temporary storage box, 551-Third connecting pipe, 56-Transmission rod, 561-Pulley, 57-Connecting rod, 571-Second rubber airbag, 572-Mounting base, 573-Limiting plate, 574-Groove, 575-Third rubber airbag, 576-Limiting block, 577-Notch, 578-First inclined surface, 579-Second inclined surface, 58-Valve. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0037] Example

[0038] like Figure 1-6 As shown in the figure, an embodiment of the present invention discloses a hand fixation device 30 for radiotherapy, including a bed board 21, a bed frame 20, and a driving device for driving the bed board 21 to move along the length direction of the bed frame 20. The hand fixation device 30 is provided on the bed board 21. The hand fixation device 30 includes an airbag 50, an air storage box 40, an upper clamping plate 32, and a lower clamping plate 31. The air storage box 40 is located on the top of the bed board 21. A piston 41 is slidably embedded in the air storage box 40. A connecting rod 42 is provided on the top of the piston 41. The top of the connecting rod 42 extends out of the air storage box 40 and connects to the lower clamping plate 31. The upper clamping plate 32 is supported above the lower clamping plate 31 by a bracket. The airbag 50 is located on one side of the bed board 21 and is connected to the air storage box 40 through a first connecting pipe 53. When the driving device drives the bed board 21 to move, it can compress the airbag 50. The hand fixation device 30 is located on both sides of the back of the pillow pad of the bed board 21. When it is necessary to fix the patient's forearm, the patient lies flat on the bed board 21, raises both hands, bends the forearms backward, and places the forearms on the top of the lower clamp 31. Then, the staff starts the drive device, which drives the bed board 21 to move into the radiotherapy device 10. During the movement, the airbag 50 is compressed, and the gas in the airbag 50 is squeezed into the gas storage box 40 due to the pressure. The gas pressure in the gas storage box 40 increases, pushing the piston 41 to move upward. The upward movement of the piston 41 drives the connecting rod 42 and the lower clamp 31 to move upward. After the lower clamp 31 moves upward, the distance between the lower clamp 31 and the upper clamp 32 gradually decreases, and the patient's arm is gradually clamped. After clamping, the patient can be given radiotherapy.

[0039] like Figure 2-3As shown, in one embodiment, the bed board 21 has sliding grooves 211 on both sides in the width direction that slide with the bed frame 20; the driving device includes a gear 52, a rack 51 and a motor, the rack 51 is disposed in the sliding groove 211, the gear 52 is rotatably connected to the bed frame 20, and the motor is disposed on the bed frame 20 to drive the gear 52 to rotate; the airbag 50 is fixedly disposed on the bed frame 20 and located in the sliding groove 211, and the airbag 50 is located on one side in the length direction of the rack 51; a pressure plate 511 is provided on the side of the rack 51 facing the airbag 50. The drive unit specifically includes a gear 52, a rack 51, and a motor. When it is necessary to drive the bed plate 21 to move, the motor is started, and the motor drives the gear 52 to rotate. After the gear 52 rotates, it drives the rack 51, which meshes with it, to move along the length of the bed plate 21. Since the rack 51 is connected to the bed plate 21, the rack 51 will drive the bed plate 21 to move. During the movement, the pressure plate 511 on the rack 51 will squeeze the air bag 50, thereby squeezing the gas in the air bag 50 into the air exchange box 54.

[0040] like Figure 3 , Figure 5 and Figure 6As shown, in one embodiment, the gas storage tank 40 is provided with a conversion box and a temporary storage box 55 on one side. The conversion box has a first through hole 543 and a second through hole 542 through its side wall. The conversion box is provided with a valve 58 for opening and closing the first through hole 543 and the second through hole 542. A connecting rod 57 is provided on one side of the valve 58, and the top of the connecting rod 57 slides out of the conversion box. The end of the first connecting pipe 53 away from the airbag 50 is connected to the air exchange box 54. A second connecting pipe 541 connected to the gas storage tank 40 is provided at the first through hole 543, and a second connecting pipe 541 connected to the temporary storage box 55 is provided at the second through hole 542. It also includes an automatic closing device. When the upper clamp 32 and the lower clamp 31 clamp the arm, the automatic closing device will drive the connecting rod 57 to move, so that the valve 58 closes the first through hole 543 and opens the second through hole 542. It should be noted that, since each patient's arm size is different, for patients with larger arms, only a small upward movement of the lower splint 31 is needed to clamp them between the upper splint 32 and the lower splint 31. However, for patients with smaller arms, a larger upward movement of the lower splint 31 is required to clamp them. During the movement of the bed board 21, the airbag 50 is continuously compressed, causing the lower splint 31 to rise continuously. However, if it rises too far, it may pinch the patient's arm. Therefore, to solve this problem, this solution includes an automatic closure mechanism. In the initial state, valve 58 is located at the second through hole 542, at which time the second through hole 542 is closed and the first through hole 543 is open. When the patient's arm is clamped, the automatic closing device can drive the connecting rod 57 to move downward, so that valve 58 closes the first through hole and the second through hole 542 opens. At this time, even if the bed board 21 continues to move, the gas squeezed out of the airbag 50 will enter the temporary storage box 55 through the second through hole 542, and the air pressure in the storage box remains consistent, so that the clamping force between the upper clamp 32 and the lower clamp 31 remains constant, and the patient will not be injured.

[0041] like Figure 5 , Figure 6As shown, in one embodiment, the support includes a top plate 33 and a vertical rod 331. The top plate 33 is positioned above the upper clamping plate 32. One end of the vertical rod 331 is connected to the top plate 33, and the other end slides through the upper clamping plate 32 and connects to the bed board 21. A first rubber airbag 332 is provided between the top plate 33 and the upper clamping plate 32. A groove 574 is provided on one side of the connecting rod 57, and the groove 574 is located above the ventilation box 54. The automatic sealing device includes a transmission rod 56 and a limiting block 576. The positioning block 576 is located in the groove 574. One end of the positioning block 576 is elastically connected to the bottom of the groove 574 through the second rubber airbag 571, and the other end extends out of the groove 574. The end of the positioning block 576 away from the bottom of the groove 574 is provided with a notch 577. The top of the notch 577 is inclined downward and its bottom is inclined upward. The transmission rod 56 is located on one side of the upper clamping plate 32. The bottom of the transmission rod 56 is rotatably connected to a pulley 561, which is located in the notch 577. It should be noted that when the upper clamp 32 is pushed upward by the lower clamp 31 a certain distance, that is, when the first rubber airbag 332 is compressed to a certain length, it is considered that the patient's arm has been clamped. During the compression of the first rubber airbag 332, the transmission rod 56 will rise. The rise of the transmission rod 56 will drive the pulley 561 to rise. The rise of the pulley 561 will squeeze the first inclined surface 578 at the notch 577 of the limiting block 576, causing the limiting block 576 to retract into the groove 574. After the limiting block 576 retracts into the groove 574, the connecting rod 57 is no longer limited and will descend due to gravity. This will cause the connecting rod 57 to drive the valve 58 to move downward to the first through hole 543 and close the first through hole 543, while the second through hole 542 will open. The gas squeezed out of the airbag 50 will enter the temporary storage box 55 through the second through hole. When resetting, the limiting block can be retracted into the groove again by the second inclined surface 579 at the bottom of the notch, which will cooperate with the top wall of the air exchange box.

[0042] like Figure 6 As shown, in one embodiment, the bottom of the connecting rod 57 is provided with a mounting base 572, and a third rubber airbag 575 is sleeved on the connecting rod 57. One end of the third rubber airbag 575 is connected to the mounting base 572, and the other end is connected to the top of the inner cavity of the air exchange box 54. The third rubber airbag 575 can provide elasticity to the connecting rod 57.

[0043] like Figure 6 As shown, in one embodiment, a limiting plate 573 is provided at the top of the connecting rod 57. The limiting plate 573 can limit the movement of the connecting rod 57.

[0044] In one embodiment, a one-way valve is provided at the connection between the first connecting pipe 53 and the air exchange box 54. The one-way valve can prevent the backflow of gas in the air storage box 40 when the bed board 21 stops moving.

[0045] The working principle of this embodiment is as follows:

[0046] When it is necessary to fix the patient's forearm, the patient lies flat on the bed board 21, raises both hands, bends the forearms backward, and places the forearms on the top of the lower clamp 31. Then, the operator starts the motor, which drives the gear 52 to rotate. After the gear 52 rotates, it drives the rack 51 that meshes with it to move along the length of the bed board 21. Since the rack 51 is connected to the bed board 21, the rack 51 will drive the bed board 21 to move towards the radiotherapy device 10. During the movement, the pressure plate 511 on the rack 51 will squeeze the air bag 50, thereby squeezing the gas in the air bag 50 into the air exchange box 54. Since the valve 58 in the air exchange box 54 closes the second through hole 542 and opens the first through hole 543, the gas will enter the gas storage box 40 through the first through hole 543. The gas pressure in the gas storage box 40 increases, pushing the piston 41 to move upward. The upward movement of the piston 41 drives the connecting rod 42 and the lower clamp 31 to move upward. The lower clamp 31 moves upward. Then, the distance between the lower clamp 31 and the upper clamp 32 gradually decreases, and the patient's arm is gradually clamped. When the clamping force of the two clamps reaches a certain level, the first rubber airbag 332 is compressed to a certain length. During the compression of the first rubber airbag 332, the transmission rod 56 will rise. The rise of the transmission rod 56 drives the pulley 561 to rise. The rise of the pulley 561 will squeeze the first inclined surface 578 at the notch 577 of the limiting block 576, causing the limiting block 576 to retract into the groove 574. After the limiting block 576 retracts into the groove 574, the connecting rod 57 is no longer limited. It will descend due to gravity and the elastic force of the third rubber airbag 575, causing the connecting rod 57 to drive the valve 58 to move downward to the first through hole 543 and close the first through hole 543, while the second through hole 542 opens. The gas squeezed out of the airbag 50 enters the temporary storage box 55 through the second through hole. The temporary storage box 55 can be equipped with an exhaust port for exhaust.

[0047] The circuits, electronic components, and modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The scope of protection of this invention does not involve any improvement to the software and methods.

[0048] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0049] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hand fixation device for radiotherapy, comprising a bed board (21), a bed frame (20), and a driving device for driving the bed board (21) to move along the length of the bed frame (20), characterized in that, The bed board (21) is provided with a hand fixing device (30), which includes an airbag (50), an air storage box (40), an upper clamp (32) and a lower clamp (31); The air storage box (40) is located on the top of the bed board (21). A piston (41) is slidably embedded in the air storage box (40). A connecting rod (42) is provided on the top of the piston (41). The top of the connecting rod (42) extends out to the outside of the air storage box (40) and connects to the lower clamping plate (31). The upper clamping plate (32) is supported above the lower clamping plate (31) by a bracket. The airbag (50) is located on one side of the bed board (21) and is connected to the air storage box (40) through the first connecting pipe (53). When the driving device drives the bed board (21) to move, it can squeeze the airbag (50).

2. The hand fixation device for radiotherapy according to claim 1, characterized in that, The bed board (21) is provided with sliding grooves (211) on both sides in the width direction, which are slidably engaged with the bed frame (20); The drive device includes a gear (52), a rack (51) and a motor. The rack (51) is located in a slide groove (211). The gear (52) is rotatably connected to the bed frame (20). The motor is located on the bed frame (20) and is used to drive the gear (52) to rotate. The airbag (50) is fixed on the bed frame (20) and located in the slide groove (211). The airbag (50) is located on one side of the rack (51) along its length.

3. A hand fixation device for radiotherapy according to claim 2, characterized in that, The rack (51) has a pressure plate (511) on the side facing the airbag (50).

4. A hand fixation device for radiotherapy according to claim 1, characterized in that, The gas storage box (40) is provided with a conversion box and a temporary storage box (55) on one side. The conversion box has a first through hole (543) and a second through hole (542) through it on the side wall. The conversion box is provided with a valve (58) for opening and closing the first through hole (543) and the second through hole (542). A connecting rod (57) is provided on one side of the valve (58). The top of the connecting rod (57) slides out of the conversion box. The end of the first connecting pipe (53) away from the airbag (50) is connected to the air exchange box (54). A second connecting pipe (541) connected to the air storage box (40) is provided at the first through hole (543). A second connecting pipe (541) connected to the temporary storage box (55) is provided at the second through hole (542). It also includes an automatic closing device. When the upper clamp (32) and lower clamp (31) clamp the arm, the automatic closing device will drive the connecting rod (57) to move, so that the valve (58) closes the first through hole (543) and opens the second through hole (542).

5. A hand fixation device for radiotherapy according to claim 4, characterized in that, The support includes a top plate (33) and a vertical rod (331). The top plate (33) is located above the upper clamping plate (32). One end of the vertical rod (331) is connected to the top plate (33), and the other end slides through the upper clamping plate (32) and is connected to the bed board (21). A first rubber airbag (332) is provided between the top plate (33) and the upper clamping plate (32). The connecting rod (57) has a groove (574) on one side, and the groove (574) is located above the air exchange box (54); The automatic sealing device includes a transmission rod (56) and a limiting block (576); The limiting block (576) is located in the groove (574). One end of the limiting block (576) is elastically connected to the bottom of the groove (574) through the second rubber airbag (571), and the other end extends out of the groove (574). The end of the limiting block (576) away from the bottom of the groove (574) is provided with a notch (577). The top of the notch (577) is inclined downward and its bottom is inclined upward. The transmission rod (56) is located on one side of the upper clamping plate (32), and a pulley (561) is rotatably connected to the bottom of the transmission rod (56), and the pulley (561) is located in the notch (577).

6. A hand fixation device for radiotherapy according to claim 5, characterized in that, The bottom of the connecting rod (57) is provided with a mounting base (572), and a third rubber airbag (575) is sleeved on the connecting rod (57). One end of the third rubber airbag (575) is connected to the mounting base (572), and the other end is connected to the top of the inner cavity of the air exchange box (54).

7. A hand fixation device for radiotherapy according to claim 4, characterized in that, The top of the connecting rod (57) is provided with a limiting plate (573).

8. A hand fixation device for radiotherapy according to claim 4, characterized in that, A one-way valve is provided at the connection between the first connecting pipe (53) and the air exchange box (54).

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