Double-adjustment limb fixing device for hemodialysis

Abstract

The invention relates to the technical field of medical instruments, and discloses a hemodialysis double-adjustment limb fixing device which comprises a mounting frame, a limb fixing assembly is arranged on one side of the mounting frame, a support assembly is arranged between the mounting frame and the limb fixing assembly, and the limb fixing assembly comprises a fixing rod fixedly arranged on one side of the support assembly; a positioning rod is fixedly arranged at the upper end of the fixing rod, a plurality of sets of positioning bolts are arranged in the positioning rod in a threaded mode, a plurality of sets of clamping sleeves are fixedly arranged at the other end of the positioning rod, and a plurality of sets of arc-shaped supporting frames are movably arranged among the multiple sets of clamping sleeves. According to the double-adjustment limb fixing device for hemodialysis, the limb fixing assembly and the support assembly are used in cooperation, the multiple sets of arc-shaped supporting frames are arranged so that corresponding space-reserving adjustment can be conducted on different positions of a patient, and meanwhile the plasticity of an air bag is matched with arms of the patient with different figures for fixing.

Description

Technical Field

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

[0002] The use of dialysis machines is essential for hemodialysis. When the dialysis machine is working, it collects and manages the patient's medical data through the information management system, including the patient's molecular biological information analysis and processing, dialysis records, laboratory test reports, drug use, etc. And data is an important part of the medical health big data sharing platform, providing the platform with rich data resources. Generally, it often takes 3 hours depending on the severity of the patient's condition, while it may take 5 hours for severe cases. Therefore, it is necessary to fix the patient's limbs to avoid unconscious movement of the patient's limbs after falling asleep during hemodialysis, resulting in needle removal and other situations. In the face of patients of different body shapes, if the fixation equipment cannot match the patient's body shape, it will affect the fixation effect. And conventional limb fixation devices are mostly entrusted to the bottom of the limbs, and the position of the limbs that require hemodialysis is different. If the hemodialysis cannula is located on the lower side of the arm, it is easy to press the tube body if it is placed directly on the bed or fixed equipment, which will also affect hemodialysis. Summary of the invention

[0003] The main purpose of the present invention is to provide a double-adjustable limb fixation device for hemodialysis, which can effectively solve the problems in the background technology.

[0004] To achieve the above object, the technical solution adopted by the present invention is: A double-adjustable limb fixation device for hemodialysis comprises a mounting frame, a limb fixation assembly is arranged on one side of the mounting frame, a bracket assembly is arranged between the mounting frame and the limb fixation assembly, the limb fixation assembly comprises a fixing rod fixedly arranged on one side of the bracket assembly, a positioning rod is fixedly arranged on the upper end of the fixing rod, a plurality of positioning bolts are arranged on the internal thread of the positioning rod, a plurality of ferrules are fixedly arranged on the other end of the positioning rod, a plurality of arc-shaped support frames are movably arranged between the plurality of ferrules, slide grooves are provided on both sides of the plurality of arc-shaped support frames, air bags are fixedly provided on the inner sides of the plurality of slide grooves, pipe grooves are provided on the inner sides of the plurality of air bags, two groups of joints are fixedly provided on one side of the plurality of air bags, a plurality of tracheas are fixedly connected between the plurality of joints, a last group of the plurality of joints is fixedly connected to an inflated balloon, and a threaded cap is provided on the frontmost group of threads of the plurality of joints.

[0005] Preferably, an adjustment frame is provided at one end of the mounting frame, two groups of screws are movably provided on the upper side of the mounting frame, movable openings are opened on the lower side of the adjusting frame at positions corresponding to the two groups of screws, buttons are threadedly connected to one side of the two groups of screws, an upper jacket is fixedly provided at one end of the adjusting frame, a lower jacket is rotatably provided on the lower side of the upper jacket, a control panel is fixedly provided on one side of the lower jacket, and a spring is provided between the control panel and the adjusting frame.

[0006] Preferably, the bracket assembly includes two groups of fixing seats fixedly arranged on the opposite side of the mounting frame and the fixing rod, a plurality of positioning holes are opened around the two groups of fixing seats, two groups of connecting rods are rotatably arranged on the upper side of the two groups of fixing seats, the inner sides of the four groups of connecting rods are threadedly connected with fixing bolts near the fixing seats, two groups of cross rods are rotatably arranged between the four groups of connecting rods, fixed shafts are fixedly arranged on the front and rear sides of the two groups of cross rods and the inside of the connecting rod connecting shaft, and two groups of double-hook springs are sleeved between the four groups of fixed shafts.

[0007] Preferably, the positioning bolt passes through the inside of the positioning rod and presses against one side of the arc-shaped support frame. The sliding grooves opened on both sides of the clamping sleeve and the arc-shaped support frame are slidingly arranged. Several groups of the arc-shaped support frames are evenly arranged, and two openings are arranged on the back of the arc-shaped support frame.

[0008] Preferably, the airbag is in a folded state, and several groups of the joints are connected to several groups of tracheas and the interior of the inflated airbag.

[0009] Preferably, the adjustment frame is sleeved on the outside of the two sets of screw rods, and the button block and the screw rods are locked to the mounting frame and the adjustment frame.

[0010] Preferably, the lower jacket and the control panel are an integrated structure, and the lower end of the spring sheet is in contact with the control panel, and the upper end is fixedly connected to the adjustment frame.

[0011] Preferably, the fixing bolt passes through the interior of the connecting rod and is inserted into the positioning hole, and the center positions of the two groups of cross rods are arranged to rotate crosswise.

[0012] Compared with the prior art, the present invention has the following beneficial effects: Press the control panel to squeeze the spring piece, driving the lower jacket to rotate and open to the size of the opening on one side of the upper jacket, making it convenient to clamp the whole on the bed, and then loosen the connection with the two sets of screws by turning the two sets of buttons, adjust the height of the limb fixation assembly and the bracket assembly of the mounting frame, and tighten and fix it to meet the patient's needs. Medical staff can adjust the height of several groups of arc-shaped support frames according to the position of the patient's arm that needs dialysis. For example, if the patient's arm needs an injection or the arm is bulging due to disease, the corresponding rotating arc-shaped support frame slides and moves along the sleeve to prevent the position from being squeezed. Similarly, if the position of the injection or the arm bulging due to disease is at the lower side of the arm, the corresponding arc-shaped support frame is rotated to the upper part of the arm. At this time, the position is suspended to avoid squeezing. After several groups of arc-shaped support frames are moved to the upper position, the arm will be wrapped, and the balloon will be inflated by squeezing, and the gas will be introduced into the interior of several groups of airbags through the trachea. After inflating, several groups of airbags will wrap the patient's arm and fix it in several groups of arc-shaped support frames. At the same time, the dialysis blood vessels can be placed in the tube groove to avoid pressure on the airbag after inflation, which will affect the patient's dialysis. The airbag can be deflated by rotating the threaded cap later. The setting of several groups of arc-shaped support frames can realize corresponding space adjustment for different positions of the patient. At the same time, the plasticity of the airbag can adapt to the arms of patients of different body shapes for fixation. According to the patient's dialysis status, such as when the patient is not conscious or is resting during dialysis, the limb fixation assembly on one side can be stretched so that the connecting rods and the two cross rods connected to the two sets of fixing seats can be rotated and stretched, so that the distance between the mounting frame and the limb fixation assembly can be stretched to adjust the length, and the mounting frame and the fixing rods can be changed in angle through the connection of the fixing seats respectively, completing double adjustment to meet the patient's arm placement requirements, and then rotating the four sets of fixing bolts spirally connected on the inner side of the four sets of connecting rods to move downward and insert them into the corresponding positioning holes, thereby fixing the telescopic position of the connecting rods and cross rods, and coordinating the use of the limb fixation assembly to prevent the patient's arm from unconsciously moving and affecting dialysis. When the patient is conscious, the four groups can be rotated upward to release the restrictions on the fixed seat. At this time, the patient's arm can change the angle through the connection between the connecting rod and the fixed seat, which is convenient for the patient to move properly. When the patient is accidentally pulled sharply, the elastic support of the two groups of double-hook springs will make the patient feel greater damping, reminding the patient to pay attention to the movement of his arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of a double-adjustable limb fixation device for hemodialysis of the present invention; Figure 2 It is a partial structural schematic diagram of a double-adjustable limb fixation device for hemodialysis of the present invention; Figure 3 This is a schematic structural diagram of a limb fixation component of a double-adjustable limb fixation device for hemodialysis of the present invention; Figure 4 It is a schematic side structural diagram of a limb fixation component of a double-adjustable limb fixation device for hemodialysis of the present invention; Figure 5It is a partial rotation schematic diagram of a limb fixation component of a double-adjustable limb fixation device for hemodialysis of the present invention; Figure 6 A double-adjustable limb fixation device for hemodialysis of the present invention Figure 5 A schematic diagram of the enlarged structure of the middle part A; Figure 7 It is a schematic diagram of a partially unfolded structure of a limb fixation component of a double-adjustable limb fixation device for hemodialysis of the present invention; Figure 8 The present invention is a schematic diagram of the structure of a bracket assembly of a double-adjustable limb fixation device for hemodialysis.

[0014] In the figure: 1. mounting frame; 2. limb fixing assembly; 21. fixing rod; 22. positioning rod; 23. positioning bolt; 24. ferrule; 25. arc-shaped support frame; 26. slide groove; 27. air bag; 28. pipe groove; 29. ​​joint; 210. air pipe; 211. inflated air bag; 212. threaded cap; 3. bracket assembly; 31. fixing seat; 32. positioning hole; 33. connecting rod; 34. fixing bolt; 35. cross rod; 36. fixed shaft; 37. double hook spring; 4. adjustment frame; 5. screw; 6. movable mouth; 7. button block; 8. upper jacket; 9. lower jacket; 10. control panel; 11. shrapnel. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0016] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are relative relationships of directions or positions, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0017] See also Figure 1-Figure 8The present invention provides an embodiment: a double-adjustable limb fixation device for hemodialysis, comprising a mounting frame 1, a limb fixation assembly 2 is arranged on one side of the mounting frame 1, a bracket assembly 3 is arranged between the mounting frame 1 and the limb fixation assembly 2, the limb fixation assembly 2 comprises a fixing rod 21 fixedly arranged on one side of the bracket assembly 3, a positioning rod 22 is fixedly arranged on the upper end of the fixing rod 21, a plurality of groups of positioning bolts 23 are arranged on the internal thread of the positioning rod 22, a plurality of groups of ferrules 24 are fixedly arranged on the other end of the positioning rod 22, and a plurality of groups of ferrules 24 are fixedly arranged on the other end of the positioning rod 22. Several groups of arc-shaped support frames 25 are movably arranged in between, slide grooves 26 are provided on both sides of several groups of arc-shaped support frames 25, air bags 27 are fixedly arranged on the inner sides of several groups of slide grooves 26, pipe grooves 28 are provided on the inner sides of several groups of air bags 27, two groups of joints 29 are fixedly arranged on one side of several groups of air bags 27, several groups of air pipes 210 are fixedly connected between several groups of joints 29, the last group among several groups of joints 29 is fixedly connected with an inflated air bag 211, and the frontmost group of threads among several groups of joints 29 is provided with a threaded cap 212.

[0018] The positioning bolt 23 passes through the interior of the positioning rod 22 and presses against one side of the arc-shaped support frame 25. The sleeve 24 and the slide grooves 26 on both sides of the arc-shaped support frame 25 are slidingly arranged. Several groups of arc-shaped support frames 25 are evenly arranged. Two openings are provided on the back of the arc-shaped support frame 25. The airbag 27 is in a folded state. Several groups of joints 29 are connected with several groups of air pipes 210 and the inside of the inflated balloon 211.

[0019] Medical staff can adjust the height of several groups of arc-shaped support frames 25 according to the position of the patient's arm that needs dialysis, such as the position where the patient's arm needs to be pierced with an injection or the arm is swollen due to a disease, and the corresponding rotating arc-shaped support frame 25 slides and moves along the card sleeve 24 (such as Figure 5 ), to prevent the possibility of squeezing of this position. Similarly, if the arm swelling caused by acupuncture or disease is at the lower side of the arm, rotate the corresponding arc-shaped support frame 25 to the upper side of the arm. At this time, the position is suspended to avoid squeezing. After several groups of arc-shaped support frames 25 are moved to the upper side, the arm will be wrapped. By squeezing and inflating the balloon 211, the gas is introduced into the interior of several groups of airbags 27 by the trachea 210. The inflated several groups of airbags 27 will wrap the patient's arm and fix it in several groups of arc-shaped support frames 25. At the same time, the tube groove 28 can be used to place the dialysis blood vessel therein to avoid the airbag 27 from being compressed after inflation and affecting the patient's dialysis. Subsequently, the threaded cap 212 can be rotated to open the airbag 27 to deflate the airbag. The setting of several groups of arc-shaped support frames 25 can realize corresponding space adjustment for different positions of the patient. At the same time, the plasticity of the airbag 27 can adapt to the arms of patients with different body shapes for fixation.

[0020] An adjusting frame 4 is provided at one end of the mounting frame 1, two groups of screw rods 5 are movably provided on the upper side of the mounting frame 1, movable openings 6 are provided on the lower side of the adjusting frame 4 corresponding to the positions of the two groups of screw rods 5, buttons 7 are threadedly connected to one side of the two groups of screw rods 5, an upper jacket 8 is fixedly provided at one end of the adjusting frame 4, a lower jacket 9 is rotatably provided on the lower side of the upper jacket 8, a control panel 10 is fixedly provided on one side of the lower jacket 9, and a spring piece 11 is provided between the control panel 10 and the adjusting frame 4.

[0021] The adjusting frame 4 is sleeved on the outside of the two sets of screw rods 5, the button block 7 and the screw rods 5 lock the mounting frame 1 and the adjusting frame 4, the lower jacket 9 and the control board 10 are an integrated structure, and the lower end of the spring piece 11 fits the upper end of the control board 10 and is fixedly connected to the adjusting frame 4.

[0022] Press the control panel 10 to squeeze the spring piece 11, driving the lower jacket 9 to rotate and open to the size of the opening on one side of the upper jacket 8, so as to facilitate clamping the whole on the bed, and then loosen the connection with the two sets of screws 5 by turning the two sets of button blocks 7, adjust the height of the limb fixing component 2 and the bracket component 3 of the mounting frame 1, and tighten and fix them after adapting to the patient's needs.

[0023] The bracket assembly 3 includes two groups of fixing seats 31 fixedly arranged on the opposite side of the mounting frame 1 and the fixing rod 21, and a plurality of positioning holes 32 are opened around the two groups of fixing seats 31. Two groups of connecting rods 33 are rotatably arranged on the upper side of the two groups of fixing seats 31. The inner sides of the four groups of connecting rods 33 are threadedly connected with fixing bolts 34 near the fixing seats 31. Two groups of cross rods 35 are rotatably arranged between the four groups of connecting rods 33. Fixed shafts 36 are fixedly arranged on the front and rear sides of the two groups of cross rods 35 and the inside of the connecting shafts of the connecting rods 33. Two groups of double-hook springs 37 are sleeved between the four groups of fixed shafts 36.

[0024] The fixing bolt 34 passes through the interior of the connecting rod 33 and is inserted into the positioning hole 32 . The center positions of the two groups of cross rods 35 are arranged to rotate crosswise.

[0025] According to the patient's state during dialysis, such as when the patient's consciousness is not very good or when the patient is resting during dialysis, the limb fixing component 2 on one side can be stretched, so that the connecting rod 33 and the two groups of cross rods 35 connected to the two groups of fixing seats 31 can be rotated and stretched, so as to achieve the distance stretching between the mounting frame 1 and the limb fixing component 2 for length adjustment, and the mounting frame 1 and the fixing rod 21 can change the angle through the connection of the fixing seat 31 respectively, so as to complete the double adjustment to meet the patient's arm placement requirements, and then rotate the four groups of fixing bolts 34 spirally connected to the inner side of the four groups of connecting rods 33 to move downward and insert them into the corresponding positioning holes 32, so as to fix the telescopic position of the connecting rod 33 and the cross rod 35, cooperate with the use of the limb fixing component 2, prevent the patient's arm from unconsciously moving and affecting dialysis, and when the consciousness is awake, the four groups can be rotated upward to release the restriction on the fixing seat 31, at this time, the patient's arm can change the angle through the connection between the connecting rod 33 and the fixing seat 31, so as to facilitate the patient's appropriate activities, and when the patient is pulled unexpectedly and greatly, due to the elastic holding of the two groups of double hook springs 37, the patient will feel a large damping, reminding the patient to pay attention to the movement of his arm.

[0026] Working principle: When in use, first press the control panel 10 to squeeze the spring sheet 11, drive the lower jacket 9 to rotate and open the size of the opening on one side of the upper jacket 8, so as to clamp the whole on the bed, and then loosen the connection with the two sets of screws 5 by rotating the two sets of button blocks 7, adjust the height of the limb fixing component 2 and the bracket component 3 of the mounting frame 1, and tighten and fix them after adapting to the needs of the patient; secondly, the medical staff can adjust the height of several groups of arc-shaped support frames 25 according to the position of the patient's arm that needs dialysis, such as the position where the patient's arm needs to be pierced with an acupuncture needle or the arm is swollen due to the disease, and the corresponding rotating arc-shaped support frame 25 slides and moves along the clamping sleeve 24 (such as Figure 5), to prevent the possibility of squeezing the position. Similarly, if the arm swelling caused by acupuncture or disease is at the lower side of the arm, rotate the corresponding arc support frame 25 to the upper side of the arm. At this time, the position is suspended to avoid squeezing. After several groups of arc support frames 25 are moved to the upper side, the arm will be wrapped. By squeezing and inflating the balloon 211, the gas is introduced into the interior of several groups of air bags 27 by the trachea 210. The inflated several groups of air bags 27 will wrap the patient's arm and fix it in several groups of arc support frames 25. At the same time, the tube groove 28 can be set to place the dialysis blood vessel therein to avoid the air bag 27 being compressed after inflation and affecting the patient's dialysis. Subsequently, the air bag 27 can be deflated by rotating the threaded cap 212. The setting of several groups of arc support frames 25 can realize corresponding space adjustment for different positions of the patient. At the same time, the plasticity of the air bag 27 can adapt to the arms of patients of different body shapes for fixation. In addition, according to the patient's state during dialysis, such as when the patient's consciousness is not very good or when the patient is resting during dialysis, one side can be stretched The limb fixing assembly 2 allows the connecting rod 33 and the two groups of cross rods 35 connected to the two groups of fixing seats 31 to rotate and stretch, so that the distance between the mounting frame 1 and the limb fixing assembly 2 is stretched to adjust the length, and the mounting frame 1 and the fixing rod 21 are respectively connected through the fixing seat 31 to change the angle, so as to complete the double adjustment to meet the patient's arm placement requirements, and then the four groups of fixing bolts 34 spirally connected to the inner side of the four groups of connecting rods 33 are rotated to move downward and inserted into the corresponding positioning holes 32, so as to fix the telescopic position of the connecting rod 33 and the cross rod 35, and cooperate with the use of the limb fixing assembly 2 to prevent the patient's arm from unconsciously moving and affecting dialysis. When the consciousness is in a clear state, the four groups can be rotated upward to release the restriction on the fixing seat 31. At this time, the patient's arm can be changed in angle through the connection between the connecting rod 33 and the fixing seat 31, which is convenient for the patient to move appropriately. When the patient is pulled unexpectedly and greatly, due to the elastic holding of the two groups of double hook springs 37, the patient will feel a large damping, reminding the patient to pay attention to the movement of his arm.

[0027] The airbag 27 and the inflated airbag 211 in the present invention are common knowledge in the art, and their working principles are already known technologies, and the models are selected according to actual use, so they will not be explained in detail.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dual-adjustable limb fixation device for hemodialysis, comprising a mounting frame (1), characterized in that: A limb fixing assembly (2) is arranged on one side of the mounting frame (1), a bracket assembly (3) is arranged between the mounting frame (1) and the limb fixing assembly (2), the limb fixing assembly (2) comprises a fixing rod (21) fixedly arranged on one side of the bracket assembly (3), a positioning rod (22) is fixedly arranged on the upper end of the fixing rod (21), a plurality of groups of positioning bolts (23) are arranged on the internal thread of the positioning rod (22), a plurality of groups of clamping sleeves (24) are fixedly arranged on the other end of the positioning rod (22), and a plurality of groups of arc-shaped support frames (25) are movably arranged between the plurality of groups of clamping sleeves (24). Several groups of arc-shaped support frames (25) are provided with slide grooves (26) on both sides, several groups of slide grooves (26) are fixedly provided with air bags (27) on the inner sides, several groups of air bags (27) are provided with tube grooves (28) on the inner sides, several groups of air bags (27) are fixedly provided with two groups of joints (29) on one side, several groups of air pipes (210) are fixedly connected between the several groups of joints (29), the last group of the several groups of joints (29) is fixedly connected with an inflatable air bag (211), and the frontmost group of threads of the several groups of joints (29) is provided with a threaded cap (212).

2. A dual-adjustable limb fixation device for hemodialysis according to claim 1, characterized in that: An adjustment frame (4) is provided at one end of the mounting frame (1), two groups of screw rods (5) are movably provided on the upper side of the mounting frame (1), movable openings (6) are provided on the lower side of the adjustment frame (4) at positions corresponding to the two groups of screw rods (5), and buttons (7) are threadedly connected to one side of the two groups of screw rods (5), an upper jacket (8) is fixedly provided at one end of the adjustment frame (4), a lower jacket (9) is rotatably provided on the lower side of the upper jacket (8), a control panel (10) is fixedly provided on one side of the lower jacket (9), and a spring sheet (11) is provided between the control panel (10) and the adjustment frame (4).

3. A dual-adjustable limb fixation device for hemodialysis according to claim 1, characterized in that: The bracket assembly (3) comprises two groups of fixing seats (31) fixedly arranged on the side opposite to the mounting frame (1) and the fixing rod (21); a plurality of positioning holes (32) are formed around the two groups of fixing seats (31); two groups of connecting rods (33) are rotatably arranged on the upper sides of the two groups of fixing seats (31); fixing bolts (34) are threadedly connected to the inner sides of the four groups of connecting rods (33) near the fixing seats (31); two groups of cross rods (35) are rotatably arranged between the four groups of connecting rods (33); fixing shafts (36) are fixedly arranged on the front and rear sides of the two groups of cross rods (35) and the interior of the connecting shafts of the connecting rods (33); and two groups of double-hook springs (37) are sleeved between the four groups of fixing shafts (36).

4. A dual-adjustable limb fixation device for hemodialysis according to claim 1, characterized in that: The positioning bolt (23) passes through the interior of the positioning rod (22) and is pressed against one side of the arc-shaped support frame (25). The sleeve (24) and the slide grooves (26) provided on both sides of the arc-shaped support frame (25) are arranged for sliding. A plurality of groups of the arc-shaped support frames (25) are evenly arranged, and two openings are provided on the back of the arc-shaped support frame (25).

5. The dual-adjustable limb fixation device for hemodialysis according to claim 1, characterized in that: The airbag (27) is in a folded state, and a plurality of groups of joints (29) are in communication with a plurality of groups of air tubes (210) and the interior of the inflated airbag (211).

6. A dual-adjustable limb fixation device for hemodialysis according to claim 2, characterized in that: The adjusting frame (4) is sleeved on the outside of the two sets of screw rods (5), and the button block (7) and the screw rods (5) lock the mounting frame (1) and the adjusting frame (4).

7. A dual-adjustable limb fixation device for hemodialysis according to claim 2, characterized in that: The lower jacket (9) and the control panel (10) are an integrated structure, and the lower end of the spring sheet (11) is in contact with the control panel (10) and the upper end is fixedly connected to the adjustment frame (4).

8. The dual-adjustable limb fixation device for hemodialysis according to claim 3, characterized in that: The fixing bolt (34) passes through the interior of the connecting rod (33) and is inserted into the positioning hole (32). The center positions of the two groups of cross rods (35) are arranged to rotate crosswise.

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