A flexible arm bracket for radiotherapy

Abstract

The present invention discloses a flexible arm bracket for radiotherapy, which relates to the technical field of radiotherapy. Specifically, the present invention includes a base, a cushion, and a support assembly. The cushion is disposed on the top of the support assembly. The support assembly includes a three-axis movement module, a controller, and a driving mechanism. The three-axis movement module is disposed on the top of the base. The cushion is connected to the three-axis movement module. The driving mechanism is drivably connected to the three-axis movement module. The three-axis movement module is used to move the spatial position of the cushion. The controller is electrically connected to the driving mechanism. The controller controls the driving mechanism according to the body type parameters, so that the driving mechanism drives the three-axis module to move the cushion to adjust the position of the cushion. The support assembly of the present invention adjusts the position of the cushion according to the body type parameters of the patient, without manual adjustment of the cushion position, improving the adjustment speed of the cushion position. The operator can fix the patient's arm more quickly, thereby improving the efficiency of the entire radiotherapy examination.

Description

Technical Field

[0001] The present invention relates to the technical field of radiotherapy, and specifically provides a flexible arm bracket for radiotherapy. Background Art

[0002] During the radiotherapy process, it is necessary to fix the patient's body and limbs to prevent the target area from shifting due to the change of the patient's posture during radiotherapy. When fixing the patient's body and limbs, the hospital will measure the patient's body size parameters and make a mold for fixing the patient according to the patient's body size parameters. During radiotherapy, the patient's torso and limbs are fixed by the mold. When irradiating certain parts of the patient, the arms cannot be bound in front of the chest, and at this time, the patient needs to raise the arms above the head. For example, when performing radiotherapy for breast cancer, in order to flatten the chest wall, reduce skin folds and overlap of breast tissue, so as to irradiate the target area more accurately. In this case, the patient's arms will be lifted, and the patient's arms are supported from below by an arm bracket. During the radiotherapy process, it is difficult for the patient's arms to maintain a fixed posture when they are suspended. When the posture of the patient's arms changes, the chest skin will be stretched and displaced. Therefore, it is necessary to support the patient's arms by an arm bracket so that the position and posture of the patient's arms can remain unchanged.

[0003] Since the body shapes of different patients are different, the posture positions of the arms when fixed are also different. For example, when the patient has a wider shoulder width, the width required for the arm bracket needs to be wider. Existing arm brackets usually include a cushion, a support rod and a base. The top of the support rod is connected to the cushion, and the cushion is used to support the patient's arm. There are several jacks for inserting the support rod on the base, and the bottom end of the support rod is inserted into one of the jacks to fix the position of the support rod. By inserting the support rod into different jacks, the position of the cushion can be changed to adapt the position of the cushion to the position of the patient's arm. At the same time, the support rod is an extension rod, so that the length of the support rod can be adjusted, and the height of the cushion is changed by adjusting the length of the support rod to adapt the height of the cushion to the position of the patient's arm.

[0004] However, when adjusting the position of the existing arm bracket, the patient needs to lie on the examination bed first, and the operator adjusts the position and length of the support rod according to the position of the patient's arm after lying down to fix the patient's arm. Each time the patient is examined, it is necessary to adjust the position of the arm bracket according to the patient's body shape, and it takes a lot of time to adjust the arm bracket, resulting in low efficiency of radiotherapy examination. Summary of the Invention

[0005] The present invention provides a flexible arm bracket for radiotherapy to solve the problem of low radiotherapy efficiency caused by the long time for adjusting the arm bracket.

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

[0007] A flexible arm bracket for radiotherapy, comprising a base, a cushion pad and a support assembly. The cushion pad is arranged on the top of the support assembly. The support assembly includes a three-axis movement module, a controller and a driving mechanism. The three-axis movement module is arranged on the top of the base. The cushion pad is connected to the three-axis movement module. The driving mechanism is drivably connected to the three-axis movement module. The three-axis movement module is used to move the spatial position of the cushion pad. The controller is electrically connected to the driving mechanism. The controller controls the driving mechanism according to the body shape parameters, so that the driving mechanism drives the three-axis module to move the cushion pad to adjust the position of the cushion pad.

[0008] In this solution, the controller can control the three-axis movement module according to the body shape parameters of the patient, so that the three-axis movement module adjusts and changes the position of the cushion pad, and moves the position of the cushion pad to a position suitable for fixing the arm. It is not necessary for the operator to manually adjust the position of the cushion pad, and the position of the cushion pad can be adjusted quickly, reducing the time for adjusting the position of the cushion pad, thereby improving the inspection efficiency.

[0009] Preferably, the three-axis movement module is a module composed of cylinders, and the driving mechanism is used to supply air to the three-axis movement module.

[0010] In this solution, the cylinder can be elongated by inflating the cylinder, which can achieve the effects of streamlining the structure and reducing the volume.

[0011] Preferably, the driving mechanism includes an air pump and an air inlet pipe. The air pump is connected to the air inlet pipe. The air inlet pipe is connected to the cylinder. The air pump supplies air to each cylinder through the air inlet pipe. The air inlet pipe is provided with a stop valve.

[0012] In this solution, the air pump supplies air to the cylinder through the air inlet pipe to make the cylinder elongate. After the cylinder elongates to a position suitable for supporting the patient's arm, the air inlet pipe is cut off by the stop valve, so that the cylinder remains at a fixed length, so that the position of the cushion pad remains unchanged and the position of the patient's arm is stable and unchanged.

[0013] The stroke accuracy of the cylinder is difficult to control after inflation, resulting in inaccurate position of the cushion pad. To solve this technical problem, the cylinder includes a telescopic rod and a cylinder body. The driving mechanism further includes a limit cable. One end of the limit cable is connected to the telescopic rod. The limit cable is used to limit the stroke of the cylinder.

[0014] In this solution, a limit cable is set to limit the stroke of the cylinder, so that the elongation amount of the cylinder can be controlled each time, ensuring that the elongation amount of the cylinder is accurate and reliable each time, so that the cushion pad can stay at an accurate position and improve the accuracy of the cushion pad.

[0015] Preferably, a wire tube is sleeved on the limit cable. The limit cable is slidably passed through the wire tube. One end of the wire tube is fixedly connected to the cylinder block of the cylinder, and the other end of the wire tube is fixed to the base. An adjusting assembly for adjusting the limit cable is arranged on the base. The adjusting assembly is used to adjust the length of the limit cable so as to control the stroke of the cylinder.

[0016] In this solution, an adjusting assembly is provided to control the adjusting cable, and the adjusting assembly is arranged on the base, which is convenient for the operator to control the adjusting cable.

[0017] When the patient's arm is raised above the head, in order to make the patient's arm in a comfortable and relaxed state, the patient's arm is usually bent inward. When supporting the patient's arm, it is necessary to support the upper arm and the forearm respectively. Therefore, usually four pads are provided to support the patient's arm respectively. When supporting the patient's arm, it is necessary to adjust the position of each pad respectively, and the operation is cumbersome. For this reason, the pad includes a first support portion and a second support portion. One end of the first support portion is hinged to one end of the second support portion. The first support portion is used to support the patient's upper arm, the second support portion is used to support the patient's forearm, and the three-axis moving module is connected to the first support portion.

[0018] In this solution, the second support portion for supporting the forearm is hinged to the first support portion for supporting the upper arm, which can fix the patient's forearm and upper arm in a bent state. When the first support portion is connected to the second support portion, when adjusting the position of the pad, only the position of the first support portion needs to be adjusted. After the position of the first support portion is adjusted, the position of the second support portion will move along with the movement of the first support portion. Therefore, this solution is equivalent to only needing to adjust the positions of two pads, and only three-axis moving modules need to be provided for these two pads, achieving the effect of streamlining the structure and reducing costs.

[0019] After the patient's arm moves onto the pad, in order to prevent the patient's arm from leaving the pad actively during radiotherapy, the operator also needs to use a strap to fix the patient's arm to the pad. Using a strap to fix it is likely to have problems such as the strap being too tight or too loose. If the strap is too tight, it will compress the patient's arm and cause discomfort to the patient's arm. If the strap is too loose, the patient's arm may move during radiotherapy. For this reason, the first support portion and the second support portion are frame structures with a U-shaped cross-section, and pressing air bags are respectively arranged on two inner side surfaces of the U-shaped frame structure. After the pressing air bags are inflated, they are used to press the arm inside the frame structure from the upper side.

[0020] In this solution, pressing air bags are provided to press the patient's arm. After the pressing air bags are inflated, the contact area with the patient's arm is large and will not cause discomfort to the patient's arm. And the pressing air bags can continuously apply pressure to the patient's arm, so that the patient's arm can be stably fixed.

[0021] To improve the stability of the connection between the first support part and the second support part. For this purpose, one side of the first support part and the second support part is hinged, a sleeve is arranged on the other side of the first support part, a flexible connecting rod is arranged at a position corresponding to the sleeve on the second support part, and the end of the flexible connecting rod is slidably inserted into the sleeve.

[0022] In this solution, both sides of the second support part are connected to the first support part, so that both sides of the second support part can be supported, improving the stability of the second support part.

[0023] To solve the problem that the swinging of the forearm during radiotherapy of a patient causes muscle activity and affects radiotherapy. For this purpose, a positioning airbag is arranged at one end of the flexible connecting rod inserted into the sleeve. After the positioning airbag is inflated, it adheres to the inner side wall of the sleeve and prevents the flexible connecting rod from moving relative to the sleeve through friction.

[0024] In this solution, after the patient's arm swings to a comfortable position, the relative position of the first support part and the second support part can be fixed by the cooperation of the positioning airbag at the end of the flexible connecting rod and the sleeve, preventing the second support part from swinging relative to the first support part.

[0025] Preferably, the positioning airbag and the pressing airbag are communicated with each other.

[0026] In this solution, the positioning airbag and the pressing airbag are communicated, and the two airbags can be supplied with air through one air inlet pipe, reducing the number of air inlet pipes to be arranged and making the structure of the entire arm bracket more concise.

[0027] Advantages of the present invention:

[0028] The support component of the present invention adjusts the position of the cushion according to the body size parameters of the patient, eliminating the need for manual adjustment of the cushion position, improving the adjustment speed of the cushion position, enabling the operator to fix the patient's arm more quickly, and thus improving the efficiency of the entire radiotherapy examination. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solution of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0030] Figure 1 It is a top view of the present invention;

[0031] Figure 2 It is a schematic structural diagram of the three-axis moving module and the base of the present invention;

[0032] Figure 3 The front view of the first support part of the present invention in the state where the pressing airbag is not inflated;

[0033] Figure 4 The front view of the first support part of the present invention in the state where the pressing airbag is inflated;

[0034] Figure 5 The top view of the supporting pad of the present invention;

[0035] Figure 6 The partial cross-sectional view of the flexible connecting rod, sleeve and positioning airbag of the present invention;

[0036] Figure 7 The top view of the first cylinder of the present invention in the connected state with the limiting cable and the wire tube;

[0037] Figure 8 The top view of the adjusting assembly of the present invention;

[0038] Figure 9 The partial cross-sectional view of the damping block, winding drum and fixed seat of the present invention.

[0039] In the above-mentioned drawings, the corresponding reference numerals are shown as follows:

[0040] 1. Base; 2. Three-axis moving module; 3. Supporting pad; 4. Limiting cable; 5. Wire tube; 6. Fixed seat; 7. Winding drum; 8. Damping block; 9. Motor; 21. First cylinder; 22. Second cylinder; 23. Third cylinder; 24. First sliding table; 25. Second sliding table; 31. First support part; 32. Pressing airbag; 33. Second support part; 34. Flexible connecting rod; 35. Sleeve; 36. Positioning airbag. Detailed implementation manners

[0041] Combined with the drawings, through the specific implementation manners of the embodiments of the present invention, the technical solutions of the present invention are clearly and completely described.

[0042] Embodiment 1:

[0043] As Figure 1As shown in the figure, Embodiment 1 of the present invention provides a flexible arm bracket for radiotherapy, which includes a base 1, a cushion 3 and a support assembly. The support assembly is used to support the cushion 3. The support assembly includes a three-axis movement module 2, a controller and a driving mechanism. Among them, the three-axis movement module 2 is fixed on the top of the base 1, and the top of the three-axis movement module 2 is connected to the cushion 3. The controller is electrically connected to the driving mechanism. The controller is configured with an input end for inputting the body shape parameters of the patient. The controller controls the driving mechanism according to the body shape parameters of the patient, so that the driving mechanism drives the three-axis movement module 2 to move, thereby achieving the position of the cushion 3 according to the body shape parameters of the patient, so that the position of the cushion 3 can be accurately moved to a position suitable for the patient's arm placement each time, reducing the time required to fix the patient's arm before radiotherapy and improving the radiotherapy efficiency.

[0044] It should be noted that since radiotherapy requires a customized mold for the patient to fix the patient's body. Therefore, the body shape parameters of the patient will be collected when making the mold. Therefore, when adjusting the position of the cushion 3, the body shape parameters collected when making the mold can be directly used, and there is no need to separately collect the body shape parameters of the patient again before radiotherapy. The body shape parameters of the patient can be stored in the patient's case. When radiotherapy is required, the body shape parameters can be retrieved from the patient's case and input into the controller.

[0045] As Figure 2 shown in the figure, the three-axis movement module 2 includes three cylinders and two sliders. The telescopic direction of any one of the three cylinders is perpendicular to the telescopic directions of the other two cylinders. To facilitate the distinction between the three cylinders and the two sliders, the three cylinders are divided into a first cylinder 21, a second cylinder 22 and a third cylinder 23, and the two sliders are respectively a first slider 24 and a second slider 25. The cylinder includes a cylinder body and a telescopic rod. The cylinder body of the first cylinder 21 is fixedly connected to the base 1, and the connection method can be bonding, bolt connection, etc. The telescopic rod of the first cylinder 21 is connected to the first slider 24. The telescopic direction of the first cylinder 21 is parallel to the top surface of the base 1, and the top surface of the base 1 is parallel to the horizontal plane. The first cylinder 21 is used to drive the first slider 24 to reciprocate linearly. The cylinder body of the second cylinder 22 is fixedly connected to the first slider 24, and the telescopic rod of the second cylinder 22 is connected to the second slider 25. The telescopic direction of the second cylinder 22 is parallel to the top surface of the base 1 and perpendicular to the telescopic direction of the first cylinder 21. The second cylinder 22 is used to drive the second slider 25 to reciprocate linearly. The cylinder body of the third cylinder 23 is fixedly connected to the second slider 25, and the telescopic rod of the third cylinder 23 is fixedly connected to the cushion 3. The telescopic direction of the third cylinder 23 is the vertical direction. The combined action of the first cylinder 21, the second cylinder 22 and the third cylinder 23 can achieve the effect of changing the spatial position of the cushion 3.

[0046] The third cylinder 23 can be a two-axis cylinder or a three-axis cylinder. It should be noted that a two-axis cylinder refers to a cylinder with two telescopic rods, and a three-axis cylinder refers to a cylinder with three telescopic rods. Using a two-axis cylinder or a three-axis cylinder can prevent the telescopic rod from rotating relative to the cylinder body.

[0047] The controller controls the three-axis moving module 2 according to the patient's body parameters, and can obtain the extension of the second cylinder 22 according to the patient's shoulder width. When the patient raises his arm, the angle of the arm relative to the bed surface of the examination bed is usually within a fixed range, such as 20°-40°, and the angle of the arm relative to the bed surface of the examination bed is usually an intermediate value of 30°. When the arm is supported by the support pad 3, the arm, the bed surface and the third cylinder 23 form a triangle, and the third cylinder 23 is always in a vertical state. The controller can obtain the extension of the first cylinder 21 and the third cylinder 23 in combination with the patient's arm length.

[0048] After the patient has undergone the first radiotherapy, the data of the cylinder extension of the three-axis movable module 2 can be recorded in the patient's medical record. During subsequent radiotherapy, the data of the cylinder extension can be directly obtained from the patient's medical record. The controller directly controls the three-axis movable module 2 to adjust the position of the support pad 3 based on this data, thereby reducing the time for adjusting the support pad.

[0049] The driving mechanism includes an air pump and an air intake pipe for conveying gas, wherein the output end of the air pump is connected to the air intake pipe, and the other end of the air intake pipe is connected to the cylinder. The three cylinders are respectively provided with air intake pipes, and air is supplied to the three cylinders through the three air intake pipes.

[0050] A flow meter and a stop valve can be provided on each air inlet pipe, and the controller is electrically connected to the flow meter, the stop valve and the air pump. After the controller obtains the patient's body parameters, it can determine the distance that each cylinder needs to be extended, thereby determining the distance that each cylinder needs to be extended. The distance that each cylinder needs to be extended is related to the gas delivery volume, and the controller can calculate the gas delivery volume of each cylinder. Therefore, when the controller controls the air pump to deliver gas to the cylinder, the gas delivery volume is determined by the flow meter, and the controller controls the stop valve according to the flow information of the flow meter. When the gas delivery volume reaches a certain value, the controller closes the stop valve, so that there is no gas exchange between the cylinder and the outside world, so that the expansion and contraction volume of the cylinder remains unchanged. When the gas delivery volume of each cylinder reaches the calculated gas delivery volume, the stop valves on each air inlet pipe are in a closed state.

[0051] It should be noted that the cylinder adopts an automatic reset cylinder. When the radiotherapy is over, the controller opens each stop valve, and the telescopic rod of each cylinder automatically retracts into the cylinder body. The use of an automatic reset cylinder facilitates the controller to calculate the gas delivery volume each time. The automatic reset cylinder is a common product on the market, and its specific structure and principle will not be repeated.

[0052] The controller can be a PLC, a single-chip microcomputer, etc.

[0053] As Figure 5 shown, the supporting pad 3 includes a first supporting portion 31 and a second supporting portion 33. The first supporting portion 31 is a U-shaped frame structure, and the second supporting portion 33 is also a U-shaped frame structure. One end of the side wall of the first supporting portion 31 is hinged to one end of the side wall of the second supporting portion 33, so that the first supporting portion 31 and the second supporting portion 33 can rotate relative to each other.

[0054] The first supporting portion 31 is used to support the patient's arm, while the second supporting portion 33 is used to support the patient's forearm. The U-shaped frame structure restricts the position of the patient's arm. The opening of the U-shaped frame structure faces upward, and the patient's arm is placed from the upper side of the U-shaped frame structure. The U-shaped frame structure restricts the position of the patient's arm from the lower side and the left and right sides.

[0055] As Figure 3 and Figure 4 shown, pressing air bags 32 are further arranged on the two inner side walls of the U-shaped frame structure. After the patient's arm is placed in the U-shaped frame structure, inflating the pressing air bags 32 can cause the pressing air bags 32 to expand. After the pressing air bags 32 expand, they will press the patient's arm from the side above, so that the patient's arm is fixed. The pressing air bags 32 can be communicated with an air pump through an air delivery pipeline, and the air pump delivers air to the pressing air bags 32.

[0056] Pressing air bags 32 are arranged on both the first supporting portion 31 and the second supporting portion 33. The patient's forearm and arm are fixed by the pressing air bags 32 to prevent the patient's arm from moving towards the opening direction of the U-shaped frame structure.

[0057] As Figure 6 shown, the hinged position of the first supporting portion 31 and the second supporting portion 33 is located on the side. A flexible connecting rod 34 is arranged on the side of the first supporting portion 31 opposite to the hinged position. The flexible connecting rod 34 is a bendable plastic rod. A sleeve 35 is arranged at the position of the second supporting portion 33 corresponding to the flexible connecting rod 34. One end of the flexible connecting rod 34 is slidably inserted into the sleeve 35. The axis of the sleeve 35 is parallel to the length direction of the second supporting portion 33. A positioning air bag 36 is arranged at the end of the flexible connecting rod 34. The positioning air bag 36 is located in the sleeve 35. When the positioning air bag 36 is inflated, the positioning air bag 36 abuts against the inner wall of the sleeve 35. After the positioning air bag 36 is inflated, it cannot move relative to the inner wall of the sleeve 35, so that the flexible connecting rod 34 cannot move relative to the sleeve 35. The flexible connecting rod 34 is fixedly connected to the sleeve 35, which can keep the angles of the first supporting portion 31 and the second supporting portion 33 unchanged, so that the bending amplitude of the patient's arm is fixed, and it can prevent the patient's forearm from swinging relative to the arm during radiotherapy and causing traction of the body muscles.

[0058] When the support pad 3 is in use, the entire arm bracket is placed at the head position of the examination bed, so that the base 1 is in contact with the bed surface. The position of the support pad 3 is moved by the three-axis movement module 2. After the patient lies on the examination bed, the arm is lifted and enters into the first support part 31 and the second support part 33. After the patient places the arm in a comfortable position, the pressing airbag 32 and the positioning airbag 36 are inflated. The pressing airbag 32 fixes the patient's arm in the first support part 31 and the second support part 33, and the positioning airbag 36 fixes the relative angle between the first support part 31 and the second support part 33. Subsequently, radiotherapy is performed while the patient's torso is fixed by the mold.

[0059] Both arms of the patient need to be fixed. Therefore, the arm bracket is provided with two support pads 3, and the two support pads 3 are respectively configured with two three-axis movement modules 2. The two three-axis movement modules 2 can be supplied with air by one air pump.

[0060] Since the fixed positions of the two arms of the patient are symmetrical to each other, therefore, the two first sliders 24 can be connected to each other, or rather, the two three-axis movement modules 2 share a first slider 24.

[0061] The bottom of the first support part 31 and the second support part 33 can be padded with cushion materials such as sponge and sterile cloth to improve the comfort of the patient.

[0062] The flexible connecting rod 34 can be a hollow rod. One end of the hollow rod is communicated with the pressing airbag 32, and the other end is communicated with the positioning airbag 36. When the air pump inflates the pressing airbag 32, the positioning airbag 36 will be inflated at the same time. As an alternative embodiment, a communication pipeline can be provided between the flexible connecting rod 34 and the pressing airbag 32. The gas in the pressing airbag 32 can enter into the flexible connecting rod 34 from the communication pipeline, and then enter into the positioning airbag 36 from the flexible connecting rod 34.

[0063] The support pad 3 is connected to the third cylinder 23. Since the angles of the arms of different patients will be different when they are lifted, and the corresponding support pad 3 needs to support the patient's arm, the angle of the support pad 3 also needs to be adjusted. Therefore, the support pad 3 and the third cylinder can be connected by a ball hinge structure. Or, the support pad 3 and the third cylinder can be connected by an elastic rubber pad. After the patient's arm is pressed by the pressing airbag 32, the patient's arm, the support pad 3, the third cylinder 23 and the base are equivalent to forming a triangle. According to the characteristic that a triangle has stability, once the position of the three-axis movement module 2 remains unchanged, the angle of the patient's arm will no longer change.

[0064] Embodiment 2:

[0065] The second embodiment provides a flexible arm support for radiotherapy. The difference from the first embodiment is that the method of controlling the extension and contraction amount of the cylinder in the second embodiment is different. The second embodiment does not need to set a flow meter and a stop valve on the air inlet pipe of the cylinder.

[0066] like Figure 7 As shown, in the second embodiment, the driving mechanism also includes a limit rope 4 for limiting the extension and contraction amount of the cylinder and a wire tube 5 wrapped around the limit rope 4, and the limit rope 4 is slidably connected to the wire tube 5. One end of the limit rope 4 extends from the end of the wire tube 5 and is connected to the telescopic rod of the cylinder, and the end of the wire tube 5 close to the telescopic rod is connected to the cylinder body of the cylinder. The other end of the wire tube 5 is fixed to the base 1, and the other end of the limit rope 4 is connected to an adjustment component, which is used to tighten or release the limit rope 4. When the cylinder is extended, the movement of the telescopic rod will pull the limit rope 4 to move. When the limit ropes 4 at both ends of the wire tube 5 are straightened, the telescopic rod of the cylinder will be affected by the limit rope 4 and cannot move, thereby achieving the effect of limiting the extension and contraction amount of the cylinder, that is, limiting the maximum stroke of the cylinder.

[0067] Therefore, when the controller can calculate the extension amount of the cylinder according to the patient's body parameters, the length of the limit rope 4 that the adjustment component should release can be obtained according to the extension amount of the cylinder. Therefore, when radiotherapy is needed, the limit rope 4 is first released by the adjustment component, the length of the cylinder is constrained by the limit rope 4, and then the air pump is used to supply air to the cylinder. When the cylinder is extended to the maximum under the constraint of the limit rope 4, the support pad 3 reaches the position expected by the controller.

[0068] The advantage of the second embodiment is that the air pump can continuously supply air to the cylinder, so that the expansion and contraction amount of the cylinder can remain unchanged, which is used to solve the problem of poor accuracy of the expansion and contraction amount of the cylinder due to the easy compression of gas.

[0069] like Figure 8 As shown, since the two three-axis mobile modules 2 include a total of six cylinders, each cylinder needs to be equipped with a limiting rope 4. Therefore, the adjustment component includes an adjustment part and a driving part. The adjustment part includes a fixed seat 6 and six reels 7, each positioning rope is connected to a reel 7 respectively, each positioning is coiled on the circumferential surface of the reel 7, and each reel 7 is rotatably connected to the fixed seat 6. The driving part includes six motors 9, each motor 9 is connected to the fixed seat 6, the six reels 7 are arranged in a straight line, and the six motors 9 of the driving part are also arranged in a straight line. The output shafts of the six motors 9 are respectively connected to the six reels 7 in transmission connection, and the six motors 9 are respectively used to drive the six reels 7 to rotate. The six motors 9 all use servo motors 9, which is convenient for accurately controlling the rotation angle.

[0070] The forward and reverse rotations of the reel 7 can release or wind up the limit cable 4. Before radiotherapy, the cylinder is shortened to the shortest state, and then the motor 9 is controlled to drive the reel head to wind up the limit cable 4. After all the limit cables 4 are wound up to the taut state, the controller then controls the motor 9 according to the body shape parameters of the patient, so that each reel 7 releases the limit cable 4, and the length of the limit cable 4 released by each reel 7 corresponds to the elongation of the cylinder corresponding to each limit cable 4. Then, the cylinder air pump can be used to inflate the cylinder to make the cylinder elongate to the specified length, achieving the effect of quickly and accurately controlling the position of the cushion 3.

[0071] As Figure 9 shown, to prevent the reel 7 from rotating when the cylinder elongates by pulling the limit cable 4, a damping block 8 can be provided on one side of the reel 7, and the damping block 8 is moved away when the motor 9 drives the rotation to prevent the damping block 8 from preventing the reel 7 from rotating. After the motor 9 stops rotating, the damping block 8 is inserted between the reel 7 and the fixed seat 6, and the friction between the damping block 8 and the reel 7 is used to prevent the reel 7 from rotating.

[0072] As an alternative implementation, the adjustment assembly may not be fixed to the base 1. The adjustment assembly and the air pump can be fixed to the end of the examination bed or other positions, and only the wire tube 5 needs to be extended to the position of the adjustment assembly. For example, the end of the wire tube 5 away from the cylinder is fixed to the fixed seat 6 of the adjustment assembly, and the adjustment assembly is placed on the ground at the end of the examination bed. Similarly, the air pump is connected to the cylinder through the air inlet pipe and is connected to the pressing airbag 32 through the air delivery pipe. The air inlet pipe and the air delivery pipe can be extended so that the air pump can be placed in other positions.

Claims

1. A flexible arm bracket for radiotherapy, characterized in that: The invention comprises a base (1), a support pad (3) and a support assembly, wherein the support pad (3) is arranged on the top of the support assembly, and the support assembly comprises a three-axis movable module (2), a controller and a driving mechanism, wherein the three-axis movable module (2) is arranged on the top of the base (1), the support pad (3) is connected to the three-axis movable module (2), the driving mechanism is connected to the three-axis movable module (2) in a transmission manner, the three-axis movable module (2) is used to move the spatial position of the support pad (3), the controller is electrically connected to the driving mechanism, and the controller moves the support pad (3) according to the body The driving mechanism is controlled by a parameter so that the driving mechanism drives the three-axis module to move the support pad (3) to adjust the position of the support pad (3); the three-axis moving module (2) is a module composed of a cylinder; the driving mechanism is used to supply air to the three-axis moving module (2); the cylinder comprises a telescopic rod and a cylinder body; the driving mechanism also comprises a limit rope (4); one end of the limit rope (4) is connected to the telescopic rod; the limit rope (4) is used to limit the stroke of the cylinder; a wire tube (5) is sleeved on the limit rope (4); the limit rope (4) can be slidably passed through a wire tube (5), one end of the wire tube (5) is fixedly connected to the cylinder body of the cylinder, and the other end of the wire tube (5) is fixed to the base (1), and the base (1) is provided with an adjustment component for adjusting the limit rope (4), and the adjustment component is used to adjust the length of the limit rope (4), so as to control the stroke of the cylinder, and the adjustment component includes an adjustment part and a driving part, and the adjustment part includes a fixed seat (6) and six reels (7), each limit rope (4) is connected to a reel (7), and each limit rope The utility model is wound on the circumferential surface of the reel (7), each reel (7) is rotatably connected to the fixing seat (6), the driving part comprises six motors (9), each motor (9) is connected to the fixing seat (6), the six reels (7) are arranged in a straight line, the six motors (9) of the driving part are also arranged in a straight line, the output shafts of the six motors (9) are respectively connected to the six reels (7), the six motors (9) are respectively used to drive the six reels (7) to rotate, and the forward and reverse rotation of the reel (7) can release the limit rope (4) or reel in the limit rope (4).

2. A flexible arm bracket for radiotherapy according to claim 1, characterized in that: The driving mechanism comprises an air pump and an air intake pipe, wherein the air pump is connected to the air intake pipe, and the air intake pipe is connected to the cylinder. The air pump supplies air to each cylinder through the air intake pipe, and the air intake pipe is provided with a stop valve.

3. A flexible arm bracket for radiotherapy according to claim 1, characterized in that: The support pad (3) comprises a first support portion (31) and a second support portion (33); one end of the first support portion (31) is hinged to one end of the second support portion (33); the first support portion (31) is used to support the patient's arm; the second support portion (33) is used to support the patient's forearm; and the three-axis movable module (2) is connected to the first support portion (31).

4. A flexible arm bracket for radiotherapy according to claim 3, characterized in that: The first support part (31) and the second support part (33) are frame structures with a U-shaped cross section, and two inner side surfaces of the U-shaped frame structure are respectively provided with compression airbags (32). After the compression airbags (32) are inflated, they are used to compress the arm in the frame structure from the upper side.

5. A flexible arm bracket for radiotherapy according to claim 4, characterized in that: One side of the first supporting portion (31) and the second supporting portion (33) are hinged, a sleeve (35) is provided on the other side of the first supporting portion (31), a flexible connecting rod (34) is provided at a position of the second supporting portion (33) corresponding to the sleeve (35), and an end of the flexible connecting rod (34) can be slidably inserted into the sleeve (35).

6. A flexible arm bracket for radiotherapy according to claim 5, characterized in that: One end of the flexible connecting rod (34) inserted into the sleeve (35) is provided with a positioning airbag (36). After being inflated, the positioning airbag (36) adheres to the inner wall of the sleeve (35) and prevents the flexible connecting rod (34) from moving relative to the sleeve (35) through friction.

7. A flexible arm bracket for radiotherapy according to claim 6, characterized in that: The positioning airbag (36) and the pressing airbag (32) are in communication.

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