An arm support device for hemodialysis

Abstract

The application discloses a hemodialysis arm supporting device, which comprises a clamping base, a lifting supporting mechanism, a posture adjusting seat and an arm supporting plate, wherein the arm supporting plate comprises a proximal end supporting part, a puncture avoiding window, a distal end supporting part and an avoiding frame surrounding the puncture avoiding window; a first constraint belt is arranged above the proximal end supporting part, a second constraint belt is arranged above the distal end supporting part, and an open area corresponding to the puncture avoiding window is formed between the first constraint belt and the second constraint belt; the first constraint belt and the second constraint belt are arranged on the proximal end side and the distal end side of the puncture avoiding window respectively, so that the constraint belts do not cross the puncture avoiding window, and the direct covering of the constraint belts on the puncture area is reduced; a hard ratchet connecting head is arranged at the end of the flexible fabric belt body, a backfolding belt passing window, a pressing cover, a pressing tooth and a hot riveting column are adopted to connect the flexible fabric belt body, and a relatively stable mechanical connecting structure is formed between the flexible fabric belt body and the ratchet segment.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and in particular to a hemodialysis arm support device. Background Technology

[0002] During hemodialysis, patients typically need to keep their puncture-side arm placed on one side of the dialysis bed or chair for an extended period so that medical staff can puncture, observe, and connect arteriovenous fistulas or vascular access. Because the dialysis process is lengthy, placing the patient's arm directly on the bed surface, armrest, or temporary pillow can easily cause discomfort due to height mismatch, unstable posture, or localized pressure. It also makes it difficult for medical staff to continuously observe the puncture site and the direction of the blood tubing.

[0003] Existing arm support structures used in dialysis or nursing settings typically include a clamping base, a lifting bracket, an arm support plate, and straps. Some structures also incorporate springs or cushioning pads under the support plate to improve arm support comfort. While these structures provide basic height adjustment and arm fixation, their support plates are often continuous surfaces, and the straps are typically horizontal, which can easily cover or be close to the puncture area during actual dialysis use, hindering the exposure and observation of the puncture site.

[0004] Meanwhile, dialysis tubing typically originates near the puncture site and extends to the dialysis machine. Existing support devices often only secure the arm, lacking tubing guidance structures associated with arm restraint movements. If the patient's arm moves slightly, or the tubing is pulled by clothing or bedside structures, external traction force can easily be transmitted along the tubing to the vicinity of the puncture site. Other devices, while equipped with individual tubing clamps, have independent clamping and strap fastening mechanisms, requiring healthcare workers to perform arm fixation and tubing management separately, resulting in a fragmented work area.

[0005] Furthermore, conventional straps often use flexible webbing such as nylon or polyester. If ratchet teeth are directly installed on the webbing or rigid fasteners are simply sewn or glued to the ends of the webbing, problems such as loosening of the connection, wear of the teeth, or insufficient assembly strength can easily occur after repeated fastening over a long period of time. Therefore, it is necessary to provide an arm support device that is more suitable for dialysis puncture scenarios, so that arm support, puncture avoidance, restraint fastening, and tubing guidance are more coordinated in structural layout. Summary of the Invention

[0006] The purpose of this application is to provide a hemodialysis arm support device to solve the technical problems of existing arm support devices, such as insufficient flexibility in height and posture adjustment, insufficient exposure of the puncture area, cumbersome restraint and fixation operation and difficulty in pressure control, and lack of reliable integrated solution for fixing dialysis tubing.

[0007] To achieve the above objectives, this application provides a hemodialysis arm support device, including a clamping base, a scissor-type lifting support mechanism, a posture adjustment seat, and an arm support plate; the clamping base is used to connect to the edge structure of a dialysis bed or dialysis chair; the scissor-type lifting support mechanism is mounted on the clamping base; the posture adjustment seat is mounted on the upper end of the scissor-type lifting support mechanism; the arm support plate is mounted on the posture adjustment seat, and the arm support plate sequentially forms a proximal support portion, a puncture avoidance window, and a distal support portion along the proximal to distal direction, wherein the puncture avoidance window is an open structure that extends vertically or a recessed groove lower than the support surfaces of the proximal and distal support portions.

[0008] In some embodiments, the clamping base includes a fixed clamping plate, a movable clamping plate, a locking knob, a threaded rod, and a support mounting plate; the fixed clamping plate and the movable clamping plate are disposed opposite to each other, forming a clamping gap between them for clamping the bed edge; the support mounting plate is fixedly connected to the fixed clamping plate and is located at the upper end of the fixed clamping plate; the threaded rod is fixed to the fixed clamping plate and extends toward the movable clamping plate, and the movable clamping plate is sleeved on the threaded rod through a guide hole; the locking knob is screwed onto the threaded rod and is located on the side of the movable clamping plate opposite to the fixed clamping plate. When the locking knob is rotated, the locking knob pushes the movable clamping plate closer to the fixed clamping plate to reduce the clamping gap.

[0009] In some embodiments, the scissor lift support mechanism includes a lower mounting base, an upper mounting base, a first scissor arm, a second scissor arm, a lower sliding seat, an upper sliding seat, an intermediate hinge shaft, and a lifting locking member. The lower mounting base is fixed on the clamping base and has a lower fixed hinge ear plate and a lower guide groove. The upper mounting base is disposed above the lower mounting base and has an upper fixed hinge ear plate and an upper guide groove. The first scissor arm and the second scissor arm are arranged crosswise and hinged at the middle through the intermediate hinge shaft. The lower end of the first scissor arm is hinged to the lower fixed hinge ear plate, and the upper end is hinged to the upper sliding seat, which is slidably disposed in the upper guide groove. The upper end of the second scissor arm is hinged to the upper fixed hinge ear plate, and the lower end is hinged to the lower sliding seat, which is slidably disposed in the lower guide groove. The lifting locking member is disposed on the lower mounting base and cooperates with the lower sliding seat to drive the lower sliding seat to move along the lower guide groove and lock it in a predetermined position.

[0010] In some embodiments, the lifting locking member includes an adjusting screw and an adjusting handwheel. The adjusting screw passes through the lower mounting seat along the length direction of the lower guide groove. When the adjusting handwheel is rotated, the adjusting screw pushes the lower sliding seat to move along the lower guide groove to a predetermined position and then locks it.

[0011] In some embodiments, the attitude adjustment seat includes a planar rotating seat, a pitch rotating seat, and a locking handle; the planar rotating seat includes a fixed seat plate, a rotating seat plate, and a vertical rotating shaft, the fixed seat plate is fixed to the upper end of the scissor lift support mechanism, and the rotating seat plate can rotate in a horizontal plane relative to the fixed seat plate around the vertical rotating shaft; the pitch rotating seat includes two support lugs, a transverse rotating shaft, and a connecting lug, the connecting lug is fixed to the lower surface of the arm support plate and extends between the two support lugs, and the transverse rotating shaft passes through the two support lugs and the connecting lug in sequence, so that the arm support plate can pitch rotate around the transverse rotating shaft; the locking handle includes a planar locking handle and a pitch locking handle, which are used to lock the adjusted attitude of the rotating seat plate and the arm support plate, respectively.

[0012] In some embodiments, the frame surrounding the puncture avoidance window forms an avoidance frame. First constraint mounting portions are provided on both proximal sides of the avoidance frame, and second constraint mounting portions are provided on both distal sides. A first constraint band spans above the proximal support portion, with its two ends connected to the two first constraint mounting portions. A second constraint band spans above the distal support portion, with its two ends connected to the two second constraint mounting portions. An open area corresponding to the vertical orientation of the puncture avoidance window is formed between the two constraint bands. In some embodiments, the constraint band includes a flexible webbing body and a rigid ratchet connector. The rigid ratchet connector includes a webbing connecting section and a ratchet mating section. The outer surface of the ratchet mating section forms a ratchet segment with a unidirectional ratchet structure arranged along the length direction of the constraint band.

[0013] In some embodiments, a pressure-limiting fastener is installed on the side of the avoidance frame. The pressure-limiting fastener includes a fastener seat, a hinge shaft, a bent fork-shaped rotating fastener arm, an elastic force-limiting plate, an unlocking rotating member, and a fastener arm return torsion spring. A sliding limiting groove is formed in the fastener seat, and the rigid ratchet connector can be inserted into the fastener seat along the sliding limiting groove. The bent fork-shaped rotating fastener arm is fixedly sleeved on the hinge shaft, and the fastener arm return torsion spring applies a return spring force toward the open position to the bent fork-shaped rotating fastener arm. The elastic force-limiting plate is fixed on the bent fork-shaped rotating fastener arm, with its meshing end facing the ratchet segment in the sliding limiting groove. When the bent fork-shaped rotating fastener arm rotates to the fastening position, the meshing end presses into the ratchet segment. The free end of the unlocking rotating member is located below the elastic force-limiting plate. When rotated by an external force, it pushes against the elastic force-limiting plate, causing the meshing end to disengage from the ratchet segment.

[0014] In some embodiments, the bent fork-shaped rotating buckle arm includes an operating handle, a downward connecting beam, a restraint strap buckle fork arm, and a tubing buckle fork arm. The restraint strap buckle fork arm and the tubing buckle fork arm are connected side-by-side to the lower end of the downward connecting beam, and the elastic force-limiting plate is fixed to the lower side of the restraint strap buckle fork arm. A tubing guide clamp is also installed on the side of the clearance frame, and the tubing buckle fork arm and the tubing guide clamp are vertically opposite each other. When the bent fork-shaped rotating buckle arm rotates to the buckling position, the restraint strap buckle fork arm drives the elastic force-limiting plate to press against the rigid ratchet connector, and the tubing buckle fork arm presses down synchronously to fix the dialysis blood tubing in the tubing guide clamp.

[0015] In some embodiments, the pipeline guide clamp includes a guide clamp seat, an elastic buckle, a buckle reset torsion spring, and a fixed reference floating pressure head; an arc-shaped guide groove is formed on the guide clamp seat, the elastic buckle is rotatably disposed on the guide clamp seat, and the buckle reset torsion spring drives the elastic buckle to remain in an open state; the fixed reference floating pressure head includes a fixed pressure head seat, a pressure head rod, and a force-limiting spring, the pressure head rod is slidably disposed in the fixed pressure head seat, and the force-limiting spring is disposed between the pressure head rod and the fixed pressure head seat; when the pipeline buckle fork arm presses down on the pressure head rod, the pressure head rod pushes the elastic buckle to close through the force-limiting spring, forming a pipeline accommodating gap between the elastic buckle and the arc-shaped guide groove, and the clamping force is limited to a safe range by the force-limiting spring.

[0016] Compared with the prior art, this application has the following beneficial effects: The arm support features a puncture avoidance window, ensuring the puncture site is fully exposed while the arm is supported and secured, facilitating puncture procedures and continuous observation by medical staff. The first and second restraint straps reliably secure the patient's forearm, with an open area between them ensuring the puncture site remains unobstructed. The restraint straps utilize a one-way ratchet structure for quick, one-way locking, simplifying operation. An elastic force limiter buffers and restricts the locking force through elastic deformation, preventing excessive pressure on the patient's limb. The unlocking rotating mechanism allows for rapid unlocking, and the buckle arm reset torsion spring automatically resets the bent fork-shaped rotating buckle arm. The linkage design between the restraint strap clamping fork arm and the tubing clamping fork arm allows for simultaneous restraint strap locking and dialysis tubing fixation in a single operation, significantly improving clinical efficiency. The elastic force-limiting spring in the fixed reference floating pressure head effectively controls the tubing clamping pressure, protecting the dialysis tubing from excessive clamping damage. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the hemodialysis arm support device provided in the embodiments of this application; Figure 2 yes Figure 1 Schematic diagram of the structure of the clamping base; Figure 3 yes Figure 1 Schematic diagram of the scissor lift support mechanism; Figure 4 yes Figure 3 A partial structural diagram of the cooperation between the middle lifting locking component and the lower sliding seat; Figure 5 yes Figure 1 Schematic diagram of the attitude adjustment seat; Figure 6 yes Figure 1 Schematic diagram of the structure of the mid-arm support plate; Figure 7 yes Figure 6 A schematic diagram of the installation and cooperation between the central avoidance frame and the first and second constraint bands; Figure 8 yes Figure 7 A schematic diagram of the structure of a medium-hard ratchet connector; Figure 9 yes Figure 7 A schematic diagram of the structure in which the middle pressure limiting fastener and the pipeline guide clamp are installed on the side of the clearance frame; Figure 10 yes Figure 9 A schematic diagram of the structure of the bent fork-shaped rotating buckle arm; Figure 11 yes Figure 9 A partial structural diagram illustrating the cooperation between the elastic force-limiting plate and the unlocking rotating component; Figure 12 yes Figure 9 A schematic diagram of the structure of the guide clamp for the central pipeline.

[0019] In the diagram: 100-Hemodialysis arm support device; 10-Clamping base, 11-Fixed clamping plate, 12-Modible clamping plate, 13-Locking knob, 14-Anti-slip pad, 15-Threaded rod, 16-Support mounting plate; 20-Scissor-type lifting support mechanism, 21-Lower mounting base, 211-Bottom connecting plate, 212-Lower fixed hinge ear plate, 213-Lower guide groove, 22-Upper mounting base, 221-Top connecting plate, 222-Upper fixed hinge ear plate, 223-Upper guide groove, 23-First scissor arm, 24-The first scissor arm Two-scissor lift arm, 25-lower sliding seat, 26-upper sliding seat, 27-intermediate hinge shaft, 28-lifting locking component, 281-adjusting screw, 282-adjusting handwheel, 29-fastening bolt; 30-attitude adjustment seat, 31-plane rotating seat, 311-fixed seat plate, 312-rotating seat plate, 313-vertical rotating shaft, 32-pitch rotating seat, 321-support ear plate, 322-lateral rotating shaft, 323-connecting ear plate, 33-locking handle; 40-arm support plate, 41-proximal support part, 42-puncture avoidance 43-Window, 44-Far-end support, 45-Left side frame, 46-Right side frame, 47-Proximal connection edge, 48-Far-end connection edge, 49-Avoidance frame, 51-First restraint mounting part, 52-Second restraint mounting part, 53-First restraint strap, 54-Second restraint strap, 55-Flexible webbing body, 56-Hard ratchet connector, 561-Webbing connecting section, 562-Ratchet mating section, 563-Ratchet section; 60-Pressure limiting fastener, 61-Fastening seat, 62-Hinge shaft, 63- - Bending fork-shaped rotating buckle arm, 632- Operating handle, 633- Lowering connecting beam, 634- Restraint belt buckle fork arm, 635- Pipeline buckle fork arm, 64- Sliding limit groove, 65- Elastic force limiting plate, 66- Unlocking rotating component, 67- Buckle arm reset torsion spring; 70- Pipeline guide clamp, 71- Guide clamp seat, 72- Arc-shaped guide groove, 73- Buckle rotating shaft, 74- Elastic buckle, 75- Buckle reset torsion spring; 80- Fixed reference floating pressure head, 81- Fixed pressure head seat, 84- Pressure head rod, 85- Force limiting spring. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and technical features described in this application can be combined with each other. The application will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. The terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For ease of description and understanding, in this document, the side of the patient's arm closer to the elbow is referred to as the "proximal end," and the side closer to the wrist is referred to as the "distal end"; "left side" and "right side" refer to the two sides in the width direction of the arm support when viewed from the proximal to the distal end after the patient's arm is placed on the arm support; "above" and "below" are generally based on the orientation of the arm support when it is in use and are only used to illustrate the relative positional relationship between the components, and do not constitute a limitation on the scope of protection of this application.

[0022] Example 1 like Figure 1 As shown, this application embodiment provides a hemodialysis arm support device 100. The arm support device 100 can be installed on a dialysis bed, dialysis chair, or bedside support frame to support the patient's upper limb during hemodialysis. The arm support device 100 includes a clamping base 10, a scissor-type lifting support mechanism 20, a posture adjustment seat 30, and an arm support plate 40. The clamping base 10 is used to connect to the edge structure of the dialysis bed or dialysis chair. The scissor-type lifting support mechanism 20 is installed on the clamping base 10. The posture adjustment seat 30 is installed on the upper end of the scissor-type lifting support mechanism 20, and the arm support plate 40 is installed on the posture adjustment seat 30.

[0023] like Figure 2 As shown, in some embodiments, the clamping base 10 includes a fixed clamping plate 11, a movable clamping plate 12, a locking knob 13, an anti-slip pad 14, a threaded rod 15, and a support mounting plate 16; the fixed clamping plate 11 and the movable clamping plate 12 are arranged opposite to each other, forming a clamping gap between them for clamping the edge, railing, or side support frame of the dialysis bed; the support mounting plate 16 is integrally formed or fixedly connected to the fixed clamping plate 11, and the support mounting plate 16 is located at the upper end of the fixed clamping plate 11 and extends laterally along the side away from the movable clamping plate 12; The threaded rod 15 is fixed on the fixed clamping plate 11 and extends toward the movable clamping plate 12. The movable clamping plate 12 has a guide hole for the threaded rod 15 to pass through, and the movable clamping plate 12 is sleeved on the threaded rod 15 through the guide hole. The locking knob 13 is screwed onto the threaded rod 15 and is located on the side of the movable clamping plate 12 away from the fixed clamping plate 11. When the locking knob 13 is rotated, the locking knob 13 moves axially along the threaded rod 15 and pushes against the movable clamping plate 12, so that the movable clamping plate 12 is closer to the fixed clamping plate 11, thereby reducing the clamping gap. In some embodiments, the anti-slip pad 14 is disposed on the side of the fixed clamping plate 11 facing the movable clamping plate 12, or on the side of the movable clamping plate 12 facing the fixed clamping plate 11; thus, after the locking knob 13 is tightened, the fixed clamping plate 11 and the movable clamping plate 12 are clamped at the edge of the dialysis bed, and the support mounting plate 16 serves as the fixed mounting base for the scissor lift support mechanism 20.

[0024] like Figure 3 As shown, in some embodiments, the scissor lift support mechanism 20 includes a lower mounting base 21, an upper mounting base 22, a first scissor arm 23, a second scissor arm 24, a lower sliding base 25, an upper sliding base 26, an intermediate hinge shaft 27, and a lifting locking member 28; the lower mounting base 21 is fixed on the support mounting plate 16, and the lower mounting base 21 includes a bottom connecting plate 211, a lower fixed hinge ear plate 212, and a lower guide groove 213. The bottom connecting plate 211 is attached to the upper surface of the support mounting plate 16 and is fixedly connected to the support mounting plate 16 by fastening bolts 29; the lower fixed hinge ear plate 212... 12 is set at one end of the bottom connecting plate 211, and the lower guide groove 213 is set at the other end of the bottom connecting plate 211 along the length direction of the bottom connecting plate 211; the upper mounting seat 22 is set above the lower mounting seat 21, and the upper mounting seat 22 includes a top connecting plate 221, an upper fixed hinge ear plate 222 and an upper guide groove 223. The attitude adjustment seat 30 is fixed on the top connecting plate 221, the upper fixed hinge ear plate 222 is set at one end of the top connecting plate 221, and the upper guide groove 223 is set at the other end of the top connecting plate 221 along the length direction of the top connecting plate 221.

[0025] The first scissor arm 23 and the second scissor arm 24 are arranged crosswise, and the middle parts of the first scissor arm 23 and the second scissor arm 24 are hinged together by an intermediate hinge shaft 27. The lower end of the first scissor arm 23 is hinged to the lower fixed hinge ear plate 212, and the upper end of the first scissor arm 23 is hinged to the upper sliding seat 26, which is slidably disposed in the upper guide groove 223. The upper end of the second scissor arm 24 is hinged to the upper fixed hinge ear plate 222, and the lower end of the second scissor arm 24 is hinged to the lower sliding seat 25, which is slidably disposed in the lower guide groove 213. Thus, the lower end of the first scissor arm 23 and the upper end of the second scissor arm 24 respectively form fixed hinge ends, and the upper end of the first scissor arm 23 and the lower end of the second scissor arm 24 respectively form sliding hinge ends.

[0026] The lifting locking member 28 is disposed on the lower mounting base 21 and cooperates with the lower sliding base 25. Exemplarily, the lifting locking member 28 may include an adjusting screw 281 and an adjusting handwheel 282. The adjusting screw 281 passes through the lower mounting base 21 along the length of the lower guide groove 213. The lower sliding base 25 is abutted against the adjusting screw 281. When the adjusting handwheel 282 is rotated, the adjusting screw 281 pushes the lower sliding base 25 to move along the lower guide groove 213. When the lower sliding base 25 approaches the lower fixed hinge ear plate 212, the included angle between the first scissor arm 23 and the second scissor arm 24 increases, and the upper mounting base 22 rises relative to the lower mounting base 21. When the lower sliding base 25 moves away from the lower fixed hinge ear plate 212, the included angle between the first scissor arm 23 and the second scissor arm 24 decreases, and the upper mounting base 22 lowers relative to the lower mounting base 21. After the lower sliding seat 25 moves to the predetermined position, adjust the handwheel 282 to press the adjusting screw 281 or press the lower sliding seat 25 to keep the lower sliding seat 25 in the current position in the lower guide groove 213.

[0027] In other embodiments, the lifting locking member 28 may also be a locking screw passing through the side wall of the lower mounting base 21, with the end of the locking screw abutting against the lower sliding seat 25; or, multiple positioning holes are spaced apart on the side wall of the lower guide groove 213, and an elastic positioning pin is provided on the lower sliding seat 25. When the elastic positioning pin is inserted into different positioning holes, the lower sliding seat 25 is positioned at positions corresponding to different heights. It should be noted that the lifting action of the scissor-type lifting support mechanism 20 is achieved by the lower sliding seat 25 and the upper sliding seat 26 moving along the lower guide groove 213 and the upper guide groove 223 respectively, and is not achieved by the four ends of the first scissor arm 23 and the second scissor arm 24 being fixedly hinged.

[0028] like Figure 5 As shown, the attitude adjustment seat 30 is disposed between the scissor lift support mechanism 20 and the arm support plate 40. The attitude adjustment seat 30 includes a planar rotating seat 31, a pitch rotating seat 32, and a locking handle; the planar rotating seat 31 is mounted on the top connecting plate 221 of the upper mounting base 22. The planar rotating seat 31 includes a fixed seat plate 311, a rotating seat plate 312, and a vertical rotating shaft 313. The fixed seat plate 311 is fixed on the top connecting plate 221, and the vertical rotating shaft 313 passes between the fixed seat plate 311 and the rotating seat plate 312. The rotating seat plate 312 can rotate in the horizontal plane relative to the fixed seat plate 311 around the vertical rotating shaft 313. The pitch rotating base 32 is mounted on the rotating base plate 312. The pitch rotating base 32 includes two spaced-apart support ears 321, a transverse rotating shaft 322, and a connecting ear plate 323. The two support ears 321 are fixed on the rotating base plate 312, and the connecting ear plate 323 is fixed on the lower surface of the arm support plate 40. The connecting ear plate 323 extends between the two support ears 321. The transverse rotating shaft 322 passes through one of the support ears 321, the connecting ear plate 323, and the other support ear plate 321 in sequence, so that the arm support plate 40 can pitch and rotate relative to the rotating base plate 312 around the transverse rotating shaft 322.

[0029] The locking handle 33 includes a planar locking handle and a pitch locking handle; the planar locking handle is mounted on the fixed base plate 311 or the rotating base plate 312, and the end of the planar locking handle can abut against the rotating base plate 312 or the fixed base plate 311 to restrict the rotating base plate 312 from rotating around the vertical axis 313; the pitch locking handle is mounted on the support ear plate 321, and the end of the pitch locking handle can abut against the connecting ear plate 323 or the transverse axis 322 to restrict the arm support plate 40 from rotating around the transverse axis 322.

[0030] In use, the rotating base plate 312 rotates around the vertical axis 313 to adjust the orientation of the arm support plate 40 in the horizontal plane; the arm support plate 40 rotates around the horizontal axis 322 to adjust its pitch angle. After the attitude adjustment is completed, tighten the plane locking handle and the pitch locking handle respectively to keep the rotating base plate 312 and the arm support plate 40 in the adjusted position.

[0031] like Figure 6 As shown, the arm support plate 40 is formed sequentially from proximal to distal along the direction of the arm support plate 40, comprising a proximal support portion 41, a puncture avoidance window 42, and a distal support portion 43. The proximal support portion 41 is used to support the forearm region near the elbow, and the distal support portion 43 is used to support the forearm region near the wrist. The puncture avoidance window 42 is located between the proximal support portion 41 and the distal support portion 43. The puncture avoidance window 42 is an open structure that extends vertically. In some embodiments, the puncture avoidance window 42 may also be a recessed groove that is lower than the support surfaces of the proximal support portion 41 and the distal support portion 43. When a through window is used, the puncture area can be observed from below or to the side of the arm support plate 40. When a recessed groove is used, a local avoidance space can be formed on the support surface.

[0032] The left and right sides of the puncture avoidance window 42 form a left frame edge 44 and a right frame edge 45, respectively. A proximal connecting edge 46 is formed on the proximal side of the puncture avoidance window 42, and a distal connecting edge 47 is formed on the distal side. The left frame edge 44, right frame edge 45, proximal connecting edge 46, and distal connecting edge 47 enclose and form an avoidance frame 48. The proximal connecting edge 46 connects to the proximal support portion 41, and the distal connecting edge 47 connects to the distal support portion 43. For example, the arm support plate 40 can be made of rigid medical plastic or aluminum alloy. A flexible support pad 49 can be provided on the upper surface of the proximal support portion 41 and the distal support portion 43. The flexible support pad 49 can be made of silicone, sponge, or medical polyurethane.

[0033] See Figure 6 and Figure 7 In some embodiments, first constraint mounting portions 51 are respectively provided on both sides of the proximal end of the avoidance frame 48, and second constraint mounting portions 52 are respectively provided on both sides of the distal end of the avoidance frame 48; the two ends of the first constraint band 53 are respectively connected to the two first constraint mounting portions 51, and the two ends of the second constraint band 54 are respectively connected to the two second constraint mounting portions 52; the first constraint band 53 spans above the proximal support portion 41, and the second constraint band 54 spans above the distal support portion 43, forming an open area between the first constraint band 53 and the second constraint band 54 corresponding vertically to the puncture avoidance window 42; thus, the first constraint band 53, the second constraint band 54, and the puncture avoidance window 42 are arranged with the avoidance frame 48 as the installation reference.

[0034] See Figure 8 The rigid ratchet connector 56 includes a webbing connecting section 561 and a ratchet mating section 562. The webbing connecting section 561 is fixedly connected to the end of the flexible webbing body 55. The outer surface of the ratchet mating section 562 forms a ratchet section 563. The ratchet section 563 is a unidirectional ratchet structure arranged along the length of the constraint band, used to mate with the elastic force limiting piece 65 in the pressure limiting fastener 60. The end of the flexible webbing body 55 can be fixedly connected to the webbing connecting section 561 by sewing, pressing, riveting, hot pressing, or injection molding.

[0035] See Figure 9In some embodiments, a pressure-limiting fastener 60 is installed on the outer side of the right frame edge 45 of the clearance frame 48, and a pipe guide clamp 70 is installed on the outer side of the right frame edge 45 and positioned close to the pressure-limiting fastener 60; in other embodiments, the pressure-limiting fastener 60 and the pipe guide clamp 70 may also be mirror-image positioned on the outer side of the left frame edge 44; the pressure-limiting fastener 60 includes a fastener seat 61, which is fixed to the side of the clearance frame 48, and a sliding limiting groove 64 is formed in the fastener seat 61, into which the hard ratchet connector 56 is inserted. The buckle seat 61 is inserted and can slide in the sliding limiting groove 64 in the insertion and withdrawal directions; the hinge shaft 62 is installed in a groove on the buckle seat 61, which is located above the sliding limiting groove 64; the bent fork-shaped rotating buckle arm 63 is fixedly sleeved on the hinge shaft 62; the buckle arm return torsion spring 67 is sleeved on the hinge shaft 62; one end of the buckle arm return torsion spring 67 abuts against the buckle seat 61, and the other end abuts against the bent fork-shaped rotating buckle arm 63, for applying a return spring force to the bent fork-shaped rotating buckle arm 63 to rotate toward the open position.

[0036] See Figure 10 The bent fork-shaped rotating buckle arm 63 includes a bushing portion sleeved on the hinge shaft 62, an operating handle portion 632 connected to the bushing portion, and a downward pressing connecting beam 633. A constraint strap buckle fork arm 634 and a pipeline buckle fork arm 635 are connected side by side to the lower end of the downward pressing connecting beam 633. The constraint strap buckle fork arm 634 is vertically opposite to the sliding limiting groove 64, and the pipeline buckle fork arm 635 is vertically opposite to the pipeline guide clamp 70. When the operating handle portion 632 drives the bushing portion to rotate around the hinge shaft 62, the downward pressing connecting beam 633 drives the constraint strap buckle fork arm 634 and the pipeline buckle fork arm 635 to press down synchronously.

[0037] See Figure 11 The elastic force limiting piece 65 is fixed to the lower side of the restraint belt clamping fork arm 634. The free end of the elastic force limiting piece 65 forms a meshing end, which is set towards the hard ratchet connector 56 in the sliding limiting groove 64. When the restraint belt clamping fork arm 634 is pressed down, the elastic force limiting piece 65 moves down synchronously with the restraint belt clamping fork arm 634, and the meshing end is pressed into the ratchet section 563 of the hard ratchet connector 56. When the hard ratchet connector 56 is pushed in along the insertion direction, the ratchet section 563 pushes against the meshing end, causing the elastic force limiting piece 65 to bend and make room, so that the hard ratchet connector 56 can be pushed in along the sliding limiting groove 64. The unlocking rotating piece 66 is rotatably mounted on the buckle seat 61 based on the pin shaft, and the free end of the unlocking rotating piece 66 is located below the elastic force limiting piece 65. When the unlocking rotating piece 66 is rotated by an external force, the unlocking rotating piece 66 pushes and lifts the elastic force limiting piece 65 so that it leaves the ratchet section 563.

[0038] See Figure 12 The pipeline guide clamp 70 includes a guide clamp seat 71, a snap-fit ​​rotating shaft 73, an elastic snap-fit ​​74, a snap-fit ​​reset torsion spring 75, and a fixed reference floating pressure head 80. The guide clamp 71 is fixed to the side of the clearance frame 48. An arc-shaped guide groove 72 is formed on the guide clamp 71. The snap fastener shaft 73 is rotatably installed in an installation port on the guide clamp 71. One end of the elastic snap fastener 74 is sleeved on the snap fastener shaft 73, and the other end is a free end located above the groove opening of the arc-shaped guide groove 72. The snap fastener reset torsion spring 75 is sleeved on the snap fastener shaft 73. One end of the snap fastener reset torsion spring 75 is fixed to the guide clamp 71, and the other end of the snap fastener reset torsion spring 75 abuts against the elastic snap fastener 74. When the elastic snap fastener 74 is rotated to the closed position, a tubing accommodating gap is formed between the elastic snap fastener 74 and the arc-shaped guide groove 72 for the dialysis blood tubing to pass through.

[0039] A fixed reference floating pressure head 80 is mounted on a guide clamp 71 and located above the free end of the elastic snap fastener 74. The fixed reference floating pressure head 80 includes a fixed pressure head seat 81, a pressure head rod 84, and a force-limiting spring 85. The fixed pressure head seat 81 is fixed on the guide clamp 71, the pressure head rod 84 is slidably disposed within the fixed pressure head seat 81, and the force-limiting spring 85 is disposed between the pressure head rod 84 and the fixed pressure head seat 81. The upper end of the pressure head rod 84 is located below the pipe snap fastener fork arm 635, and the lower end of the pressure head rod 84 is opposite to the free end of the elastic snap fastener 74.

[0040] When the bent fork-shaped rotating buckle arm 63 is in the open position, the constraint strap buckle fork arm 634 disengages from the hard ratchet connector 56, the pipeline buckle fork arm 635 disengages from the pressure head rod 84, and the elastic buckle 74 disengages from the slot of the arc-shaped guide groove 72 under the action of the buckle reset torsion spring 75. When the bent fork-shaped rotating buckle arm 63 rotates from the open position to the closed position, the constraint strap buckle fork arm 634 drives the elastic force limiting piece 65 to press against the hard ratchet connector 56, and the pipeline buckle fork arm 635 simultaneously presses down on the pressure head rod 84. The pressure head rod 84 pushes the elastic buckle 74 to the slot of the arc-shaped guide groove 72 through the force limiting spring 85. When unlocking, the unlocking rotating part 66 pushes the elastic force limiting piece 65 away from the ratchet section 563, the buckle arm reset torsion spring 67 drives the bent fork-shaped rotating buckle arm 63 back to the open position, and the buckle reset torsion spring 75 drives the elastic buckle 74 to disengage from the slot of the arc-shaped guide groove 72.

[0041] The working principle of this invention is as follows: In use, the clamping base 10 is installed on the edge of the dialysis bed or dialysis chair. The clamping gap between the fixed clamping plate 11 and the movable clamping plate 12 is fastened onto the bed edge, bed rail, or bedside support frame. The locking knob 13 is rotated, and the locking knob 13 is pushed axially along the threaded rod 15, driving the movable clamping plate 12 to move towards the fixed clamping plate 11, so that the two plates clamp the bed edge structure. The anti-slip pads 14 on the fixed clamping plate 11 and the movable clamping plate 12 further enhance the clamping friction and prevent the device from shifting. The support mounting plate 16 serves as the fixed base for subsequent mechanisms, bears the load of the overall device, and transmits it to the edge of the bed.

[0042] Subsequently, the support height of the arm support plate 40 is adjusted via the scissor lift support mechanism 20. Rotating the adjusting handwheel 282 causes the adjusting screw 281 to push the lower sliding seat 25 along the length of the lower guide groove 213. When the lower sliding seat 25 moves downwards towards the fixed hinge plate 212, the angle between the first scissor arm 23 and the second scissor arm 24 increases, and the upper mounting seat 22 rises relative to the lower mounting seat 21. Conversely, when the lower sliding seat 25 moves away from the lower fixed hinge plate 212, the angle between the two scissor arms decreases, and the upper mounting seat 22 descends. After adjusting to the desired height, the adjusting handwheel 282 presses the adjusting screw 281 or the lower sliding seat 25, locking the lower sliding seat 25 in its current position within the lower guide groove 213, and the upper mounting seat 22 remains at the corresponding height.

[0043] The posture adjustment seat 30 allows for adjustment of the arm support plate 40 in two dimensions: horizontal rotation and pitch angle. Loosening the planar locking handle allows the rotating seat plate 312 to rotate horizontally around the vertical axis 313, thereby adjusting the orientation of the arm support plate 40 to match the natural placement of the patient's arm. Loosening the pitch locking handle allows the connecting ear plate 323 to rotate the arm support plate 40 around the horizontal axis 322, adjusting the fore-and-aft tilt angle of the support plate to ensure the patient's forearm is in a comfortable supported position. After posture adjustment, tightening the planar locking handle and the pitch locking handle simultaneously locks the posture in both directions by abutting against the rotating seat plate 312 and the connecting ear plate 323 at their ends.

[0044] After the patient's arm is placed on the arm support plate 40, the proximal support part 41 supports the forearm near the elbow, and the distal support part 43 supports the forearm near the wrist. The puncture area is aligned with the puncture avoidance window 42 to fully expose the puncture site, facilitating operation and observation by medical staff. The first restraint band 53 is positioned above the proximal support part 41, and the second restraint band 54 is positioned above the distal support part 43. The rigid ratchet connectors 56 at both ends of the flexible webbing body 55 are inserted into the sliding limiting grooves 64 of the corresponding pressure limiting fasteners 60. During insertion, the ratchet segment 563 pushes against the meshing end of the elastic force limiting piece 65, causing the elastic force limiting piece 65 to bend and allow the rigid ratchet connector 56 to smoothly advance along the insertion direction, achieving a step-by-step locking of the one-way anti-retraction structure, thereby fixing the restraint band to a tightness adapted to the thickness of the patient's arm.

[0045] Pressing the operating handle 632 of the bent fork-shaped rotating buckle arm 63 causes the bushing to rotate around the hinge shaft 62 towards the buckling position. Simultaneously, the downward-pressing connecting beam 633 drives the constraint strap buckle fork arm 634 and the pipe buckle fork arm 635 to move downwards. On one side of the constraint strap buckle fork arm 634, the elastic force-limiting plate 65 presses down, pressing the meshing end into the ratchet section 563 of the hard ratchet connector 56, restricting the ratchet connector 56 from moving in the withdrawal direction. The constraint strap thus remains in its current position. The length is locked; on one side of the tubing clamp fork arm 635, the fork arm presses down on the pressure head rod 84. The pressure head rod 84 transmits force to the free end of the elastic clamp 74 through the force-limiting spring 85, pushing the elastic clamp 74 to rotate into the arc-shaped guide groove 72, forming a tubing accommodating gap between the clamp and the arc-shaped guide groove 72, thus clamping and fixing the dialysis blood tubing; the single clamping action of the bending fork-shaped rotating clamp arm 63 simultaneously completes the two operations of locking the restraint strap and fixing the dialysis tubing, improving operational efficiency. The force-limiting spring 85 keeps the clamping force on the tubing within a safe range, avoiding damage to the dialysis tubing.

[0046] When it is necessary to release the fixation, the unlocking rotating part 66 is turned, and its free end pushes against the elastic force limiting piece 65 to lift up, so that the meshing end disengages from the ratchet section 563; then, the buckle arm reset torsion spring 67 drives the bent fork-shaped rotating buckle arm 63 to return to the open position, the restraint strap buckle fork arm 634 and the tubing buckle fork arm 635 lift up synchronously, the downward pressure on the pressure head rod 84 is eliminated, the buckle reset torsion spring 75 drives the elastic buckle 74 to rotate back to its original position and leave the arc-shaped guide groove 72; the hard ratchet connector 56 exits from the sliding limiting groove 64, the restraint strap is loosened, the dialysis tubing is released, and the patient's arm can be freely removed.

Claims

1. A hemodialysis arm support device, characterized in that, It includes a clamping base (10), a scissor lift support mechanism (20), a posture adjustment seat (30), and an arm support plate (40). The clamping base (10) is used to connect to the edge structure of the dialysis bed or dialysis chair; The scissor lift support mechanism (20) is mounted on the clamping base (10); The attitude adjustment seat (30) is installed at the upper end of the scissor lift support mechanism (20); The arm support plate (40) is installed on the posture adjustment seat (30). The arm support plate (40) is formed in sequence from the proximal end to the distal end as a proximal support part (41), a puncture avoidance window (42) and a distal support part (43). The puncture avoidance window (42) is an open structure that runs through the top and bottom or a recessed groove that is lower than the support surface of the proximal support part (41) and the distal support part (43).

2. The hemodialysis arm support device according to claim 1, characterized in that, The clamping base (10) includes a fixed clamping plate (11), a movable clamping plate (12), a locking knob (13), a threaded rod (15), and a support mounting plate (16). The fixed clamping plate (11) and the movable clamping plate (12) are arranged opposite to each other, and a clamping gap is formed between them for clamping the edge, railing or side support frame of the dialysis bed; The support mounting plate (16) is fixedly connected to the fixed clamping plate (11). The support mounting plate (16) is located at the upper end of the fixed clamping plate (11) and extends laterally along the side away from the movable clamping plate (12). The threaded rod (15) is fixed on the fixed clamping plate (11) and extends toward the movable clamping plate (12). The movable clamping plate (12) has a guide hole for the threaded rod (15) to pass through. The movable clamping plate (12) is sleeved on the threaded rod (15) through the guide hole. The locking knob (13) is screwed onto the threaded rod (15) and is located on the side of the movable clamping plate (12) away from the fixed clamping plate (11). When the locking knob (13) is rotated, the locking knob (13) moves axially along the threaded rod (15) and pushes the movable clamping plate (12) closer to the fixed clamping plate (11) to reduce the clamping gap.

3. The hemodialysis arm support device according to claim 1, characterized in that, The scissor lift support mechanism (20) includes a lower mounting base (21), an upper mounting base (22), a first scissor arm (23), a second scissor arm (24), a lower sliding base (25), an upper sliding base (26), an intermediate hinge shaft (27), and a lift locking component (28). The lower mounting base (21) is fixed on the clamping base (10), and the lower mounting base (21) is provided with a lower fixed hinge ear plate (212) and a lower guide groove (213); the upper mounting base (22) is disposed above the lower mounting base (21), and the upper mounting base (22) is provided with an upper fixed hinge ear plate (222) and an upper guide groove (223). The first scissor arm (23) and the second scissor arm (24) are arranged crosswise, and the middle parts of the first scissor arm (23) and the second scissor arm (24) are hinged through the intermediate hinge shaft (27); the lower end of the first scissor arm (23) is hinged to the lower fixed hinge ear plate (212), and the upper end of the first scissor arm (23) is hinged to the upper sliding seat (26), and the upper sliding seat (26) is slidably disposed in the upper guide groove (223); the upper end of the second scissor arm (24) is hinged to the upper fixed hinge ear plate (222), and the lower end of the second scissor arm (24) is hinged to the lower sliding seat (25), and the lower sliding seat (25) is slidably disposed in the lower guide groove (213); The lifting locking member (28) is disposed on the lower mounting base (21) and cooperates with the lower sliding base (25) to drive the lower sliding base (25) to move along the lower guide groove (213) and lock the lower sliding base (25) in the current position.

4. The hemodialysis arm support device according to claim 3, characterized in that, The lifting locking component (28) includes an adjusting screw (281) and an adjusting handwheel (282). The adjusting screw (281) passes through the lower mounting base (21) along the length direction of the lower guide groove (213). The lower sliding seat (25) is abutted against the adjusting screw (281). When the adjusting handwheel (282) is rotated, the adjusting screw (281) pushes the lower sliding seat (25) to move along the lower guide groove (213). After the lower sliding seat (25) moves to a predetermined position, the adjusting handwheel (282) presses the adjusting screw (281) or the lower sliding seat (25) to keep the lower sliding seat (25) in its current position in the lower guide groove (213).

5. The hemodialysis arm support device according to claim 1, characterized in that, The attitude adjustment seat (30) includes a plane rotating seat (31), a pitch rotating seat (32), and a locking handle (33). The planar rotating seat (31) includes a fixed seat plate (311), a rotating seat plate (312), and a vertical rotating shaft (313). The fixed seat plate (311) is fixed to the upper end of the scissor lift support mechanism (20). The vertical rotating shaft (313) passes between the fixed seat plate (311) and the rotating seat plate (312). The rotating seat plate (312) can rotate in the horizontal plane relative to the fixed seat plate (311) around the vertical rotating shaft (313). The pitch rotating base (32) includes two spaced-apart support ears (321), a transverse rotating shaft (322), and a connecting ear (323). The two support ears (321) are fixed on the rotating base plate (312), and the connecting ear (323) is fixed on the lower surface of the arm support plate (40). The connecting ear (323) extends between the two support ears (321). The transverse rotating shaft (322) passes through one of the support ears (321), the connecting ear (323), and the other support ear (321) in sequence, so that the arm support plate (40) can pitch and rotate relative to the rotating base plate (312) around the transverse rotating shaft (322). The locking handle (33) includes a planar locking handle and a pitch locking handle. The planar locking handle is mounted on the fixed base plate (311) or the rotating base plate (312). The end of the planar locking handle can abut against the rotating base plate (312) or the fixed base plate (311) to restrict the rotating base plate (312) from rotating around the vertical axis (313). The pitch locking handle is mounted on the support ear plate (321). The end of the pitch locking handle can abut against the connecting ear plate (323) or the transverse axis (322) to restrict the arm support plate (40) from rotating around the transverse axis (322).

6. The hemodialysis arm support device according to claim 1, characterized in that, The left and right sides of the puncture avoidance window (42) form a left frame edge (44) and a right frame edge (45) respectively. The proximal side of the puncture avoidance window (42) forms a proximal connecting edge (46) and the distal side forms a distal connecting edge (47). The left frame edge (44), the right frame edge (45), the proximal connecting edge (46) and the distal connecting edge (47) together form an avoidance frame (48). The avoidance frame (48) has a first constraint mounting part (51) on each side of its proximal end and a second constraint mounting part (52) on each side of its distal end. The two ends of the first constraint band (53) are connected to the two first constraint mounting parts (51) respectively, and the two ends of the second constraint band (54) are connected to the two second constraint mounting parts (52) respectively. The first constraint band (53) spans above the proximal support part (41), and the second constraint band (54) spans above the distal support part (43). An open area corresponding to the puncture avoidance window (42) is formed between the first constraint band (53) and the second constraint band (54).

7. The hemodialysis arm support device according to claim 6, characterized in that, The first constraint band (53) or the second constraint band (54) includes a flexible webbing body (55) and a rigid ratchet connector (56). The rigid ratchet connector (56) includes a webbing connecting section (561) and a ratchet mating section (562). The webbing connecting section (561) is fixedly connected to the end of the flexible webbing body (55). The outer surface of the ratchet mating section (562) forms a ratchet section (563). The ratchet section (563) is a unidirectional ratchet structure arranged along the length direction of the constraint band.

8. The hemodialysis arm support device according to claim 7, characterized in that, The side of the avoidance frame (48) is equipped with a pressure limiting fastener (60), which includes a fastener seat (61), a hinge shaft (62), a bent fork-shaped rotating fastener arm (63), an elastic force limiting piece (65), an unlocking rotating piece (66), and a fastener arm reset torsion spring (67). The buckle (61) is fixed to the side of the avoidance frame (48), and a sliding limiting groove (64) is formed in the buckle (61). The hard ratchet connector (56) can be inserted into the buckle (61) along the sliding limiting groove (64) and slide in the sliding limiting groove (64) along the insertion direction and the withdrawal direction. The hinge shaft (62) is mounted on the buckle seat (61), and the bent fork-shaped rotating buckle arm (63) is fixedly sleeved on the hinge shaft (62); the buckle arm return torsion spring (67) is sleeved on the hinge shaft (62), and the two ends of the buckle arm return torsion spring (67) abut against the buckle seat (61) and the bent fork-shaped rotating buckle arm (63) respectively, for applying a return spring force to the bent fork-shaped rotating buckle arm (63) to rotate toward the open position; The elastic force limiting piece (65) is fixed on the bent fork-shaped rotating buckle arm (63). The free end of the elastic force limiting piece (65) forms a toothed end, which is positioned towards the ratchet segment (563) in the sliding limiting groove (64). When the bent fork-shaped rotating buckle arm (63) rotates from the open position to the locked position, the elastic force limiting piece (65) moves down synchronously with the bent fork-shaped rotating buckle arm (63), and the toothed end presses into the ratchet segment (563). When the hard ratchet connector (56) is pushed in along the insertion direction, the ratchet segment (563) pushes against the toothed end, causing the elastic force limiting piece (65) to bend and make room. The unlocking rotating member (66) is rotatably mounted on the buckle (61) based on the pin. The free end of the unlocking rotating member (66) is located below the elastic force limiting piece (65). When the unlocking rotating member (66) is rotated by an external force, it pushes and lifts the elastic force limiting piece (65), causing the meshing end to leave the ratchet section (563).

9. The hemodialysis arm support device according to claim 8, characterized in that, The bent fork-shaped rotating buckle arm (63) includes a bushing portion sleeved on the hinge shaft (62), an operating handle portion (632) connected to the bushing portion, a lower pressure connecting beam (633), a constraint strap buckle fork arm (634), and a pipeline buckle fork arm (635). The constraint strap buckle fork arm (634) and the pipeline buckle fork arm (635) are connected side by side to the lower end of the lower pressure connecting beam (633). The constraint strap buckle fork arm (634) is vertically opposite to the sliding limiting groove (64). The elastic force limiting piece (65) is fixed to the lower side of the constraint strap buckle fork arm (634). The side of the avoidance frame (48) is also equipped with a pipeline guide clamp (70). The pipeline guide clamp (70) is arranged adjacent to the pressure limiting fastener (60). The pipeline clamping fork arm (635) is vertically opposite to the pipeline guide clamp (70). When the bent fork rotating buckle arm (63) rotates from the open position to the fastening position, the constraint belt buckle fork arm (634) drives the elastic force limiting piece (65) to press the hard ratchet connector (56). The pipeline clamping fork arm (635) presses down synchronously to fix the dialysis blood pipeline in the pipeline guide clamp (70).

10. The hemodialysis arm support device according to claim 9, characterized in that, The pipeline guide clamp (70) includes a guide clamp seat (71), a snap-fit ​​rotating shaft (73), an elastic snap-fit ​​(74), a snap-fit ​​reset torsion spring (75), and a fixed reference floating pressure head (80). The guide clamp (71) is fixed to the side of the clearance frame (48), and an arc-shaped guide groove (72) is formed on the guide clamp (71); the snap fastener shaft (73) is rotatably mounted on the guide clamp (71), one end of the elastic snap fastener (74) is sleeved on the snap fastener shaft (73), and the other end is a free end located above the opening of the arc-shaped guide groove (72); the snap fastener reset torsion spring (75) is sleeved on the snap fastener shaft (73), one end of the snap fastener reset torsion spring (75) is fixed to the guide clamp (71), and the other end abuts against the elastic snap fastener (74), which is used to drive the elastic snap fastener (74) to remain in the open position away from the opening of the arc-shaped guide groove (72); The fixed reference floating pressure head (80) is installed on the guide clamp (71) and located above the free end of the elastic buckle (74). The fixed reference floating pressure head (80) includes a fixed pressure head seat (81), a pressure head rod (84) and a force limiting spring (85). The fixed pressure head seat (81) is fixed on the guide clamp (71). The pressure head rod (84) is slidably disposed in the fixed pressure head seat (81). The force limiting spring (85) is disposed between the pressure head rod (84) and the fixed pressure head seat (81). The upper end of the pressure head rod (84) is located below the pipe buckle fork arm (635), and the lower end of the pressure head rod (84) is opposite to the free end of the elastic buckle (74). When the fork arm (635) of the tubing clamp presses down on the pressure head rod (84), the pressure head rod (84) pushes the elastic clamp (74) to turn into the slot of the arc-shaped guide groove (72) through the force limiting spring (85). When the elastic clamp (74) is closed, a tubing accommodating gap is formed between the elastic clamp (74) and the arc-shaped guide groove (72) for the dialysis blood tubing to pass through.

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