A wrap-around waterproof closure protection device for a dialysis catheter

Abstract

The application discloses a wrapping waterproof sealing protection device for a dialysis catheter, and relates to the technical field of auxiliary devices for dialysis nursing, which comprises a protection device main body and a control system. The main body is provided with two groups of mounting frames, the inner side of the mounting frames is provided with detection assemblies, a wrapping structure is arranged between the two mounting frames, the inner side of the wrapping structure is provided with a monitoring assembly, the wrapping structure is connected with a tightening structure, and the wrapping structure can be inflated or inhaled to adhere to the skin to realize sealing and waterproofing. The monitoring assembly comprises a sliding piezoelectric film, can adhere to the skin to detect the pulse frequency, and is matched with a contraction structure. The pulling structure can be flexibly adjusted and self-adaptively kept in a position and tension of the piezoelectric film, ensures the monitoring accuracy, and realizes real-time sealing pressure monitoring of the detection assembly. The tightening structure is automatically adjusted and controlled in cooperation with the control system, so that the sealing effect is avoided from being affected by excessive compression or failure. The application has the functions of excellent waterproof sealing, self-adaptive wearing and real-time pulse monitoring, and significantly improves the safety, comfort and intelligent level of dialysis nursing.

Description

Technical Field

[0001] This invention relates to the field of assistive devices for dialysis care, specifically a wrap-around waterproof sealing protection device for dialysis catheters. Background Technology

[0002] Hemodialysis is a common renal replacement therapy for patients with acute and chronic renal failure. During dialysis treatment, vascular access is established through an indwelling catheter, and the catheter exit site is constantly exposed to the external environment. If this puncture site is contaminated with water, sweat, or bacteria, it can easily lead to catheter-related bloodstream infections, which can be life-threatening in severe cases. Therefore, patients must effectively waterproof and seal the catheter exit site during dialysis intervals and daily activities such as bathing.

[0003] Currently, the commonly used methods for protecting dialysis catheters in clinical practice mainly include traditional medical dressings and simple waterproof bags. However, these existing solutions have many limitations. First, traditional dressings are not waterproof and lose their protective function once they get wet. Simple bags are mostly fixed with elastic bands or Velcro, which have poor sealing performance and cannot completely prevent water from seeping in. Moreover, the fixing pressure is difficult to control. If it is too tight, it can compress the skin and blood vessels, affecting blood circulation. If it is too loose, it will lead to leakage or falling off.

[0004] Secondly, existing protective devices have a fixed structure and cannot be adaptively adjusted according to individual patient needs and catheter placement. They are not comfortable to wear and are prone to displacement due to movement, which can compromise their protective effect. More importantly, the protective devices currently on the market have a single function, serving only as a physical isolation barrier and lacking the ability to monitor the patient's vital signs. During dialysis, patients may experience acute complications such as hypotension and arrhythmia, and traditional devices cannot detect and warn of these abnormal conditions in time, leading to missed opportunities for optimal intervention.

[0005] Therefore, developing an intelligent protection device that integrates adaptive waterproof sealing, safety pressure regulation, and real-time pulse monitoring has significant clinical implications. Summary of the Invention

[0006] The purpose of this invention is to provide a wrap-around waterproof sealing protection device for dialysis catheters to solve the problems raised in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a wrap-around waterproof sealing protection device for dialysis catheters, comprising a protection device body and a control system. The protection device body includes at least one set of mounting frames, a detection component is disposed inside the mounting frames, a wrap-around structure is connected to the mounting frames, a monitoring component is disposed inside the wrap-around structure, a mating structure is disposed on the mounting frames, and a tightening structure is connected to the wrap-around structure. The tightening structure is used to adjust the wrap-around adhesion force of the wrap-around structure to the skin. The protection device body has any one of the following forms: a closed ring, a semi-closed ring, or a fully unfolded sheet, to adapt to the wrap-around sealing of different dialysis catheter insertion sites.

[0008] Furthermore, the monitoring component includes a rubber frame installed inside the wrapping structure. A groove is provided inside the rubber frame, and a piezoelectric film is slidably installed between the grooves. The output surface of the piezoelectric film is used to adhere to the skin and detect pulse signals. Pull-out structures are connected to both ends of the piezoelectric film, and the pull-out structures are used to adjust the position of the piezoelectric film within the grooves.

[0009] Furthermore, the pull-out structure includes a limiting cylinder and a pull bolt disposed within the limiting cylinder. The pull bolt has a retraction structure inside, which includes a retraction rod and two sets of springs. The springs are respectively connected to both ends of the retraction rod. One end of the spring is fixedly connected to the inner wall of the pull bolt, and the other end is fixedly connected to the retraction rod. A pull rope is connected to the outside of the retraction rod, and the other end of the pull rope is connected to the piezoelectric film.

[0010] Furthermore, the wrapping structure includes an airbag made of thermoplastic polyurethane, a connecting valve on the airbag, the connecting valve cooperating with the tightening structure, a plurality of memory metal wires inside the airbag, the memory metal wires being wrapped with a protective film, and the memory metal wires being equidistantly installed inside the airbag.

[0011] Furthermore, the mounting frame is made of rubber and contains memory metal wires inside. The wrapping structure, together with the mounting frame, forms a closed ring, a semi-closed ring, or a fully unfolded sheet. After inflation or inhalation, the airbag adapts to the skin contours of the arm, shoulder, neck, or abdomen via the memory metal wires.

[0012] Furthermore, the detection component includes strain gauges, which are equidistantly installed inside the mounting frame. The strain gauges are connected to the control system via wires to detect the contact pressure between the mounting frame and the skin in real time.

[0013] Furthermore, the tightening structure includes an air pump and a de-air pump, which are connected to the connection valve of the airbag via a connector. The air pump is equipped with a wireless connection module. The control system automatically controls the air pump or the de-air pump to inflate or de-air the airbag based on the pressure data fed back by the detection component.

[0014] Furthermore, when the wrapping structure is in the form of a fully unfolded sheet, its edges are provided with medical pressure-sensitive adhesive or elastic bandages to fix the wrapping structure to the surface of the abdominal skin; the wrapping structure has a catheter exit hole, and an annular sealing ring is provided around the catheter exit hole.

[0015] Furthermore, one or more piezoelectric films are provided, and when multiple films are provided, they form a piezoelectric film array, which is used to fit the arterial pulsation area corresponding to different catheter placement sites; the rubber frame is provided with an exhaust hole and a limiting plug for sealing the exhaust hole.

[0016] Furthermore, the control system is installed outside the wrapping structure, and the control system is equipped with a control panel. The control system is connected to the tightening structure via a wireless connection module, and the control system is electrically connected to the detection component and monitoring component via wires to receive pressure data and pulse signals and issue alarm prompts according to preset thresholds.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses a thermoplastic polyurethane airbag as the main body of the device, combined with memory metal wires arranged at equal intervals inside and a rubber mounting frame. This allows the device to adapt to the skin contours of different dialysis catheter placement sites such as the arm, shoulder, neck, and abdomen in three forms: a closed ring, a semi-closed ring, or a fully unfolded sheet. After inflation or inhalation, the device adapts to fit the skin and forms a continuous and uniform sealing band, effectively preventing external moisture from seeping into the puncture site, greatly reducing the risk of infection, and significantly improving the versatility and sealing stability of the device.

[0018] 2. This invention features a detection component consisting of strain gauges circumferentially arranged inside the mounting frame. This component can monitor the sealing pressure data exerted on the skin by the edge of the wrapping structure in real time and feed this data back to the control system. The control system automatically controls the air pump in the tightening structure to inflate or deflate the airbag according to a preset safety threshold range, so that the wrapping pressure is always maintained within the most reasonable range. This forms a dynamic closed-loop adjustment mechanism, effectively avoiding the risk of sealing failure due to excessively tight wrapping compressing blood vessels or excessively loose wrapping. This improves the safety, intelligence, and long-term comfort of the device.

[0019] 3. This invention innovatively integrates a monitoring component inside the wrapping structure. This component includes a piezoelectric film that can slide within a groove. Through the synergistic action of the pull-out and contraction structures, the piezoelectric film can flexibly adjust according to the patient's arterial pulsation position. Furthermore, during limb movement, the spring and contraction rod can adaptively buffer the pulling force, maintaining a stable fit between the film and the skin, thereby continuously and accurately capturing the pulse signal. The control system analyzes this signal in real time and immediately issues an alarm when abnormal pulse fluctuations occur, upgrading the traditional passive protective device into an active monitoring terminal, thus gaining valuable time for the rescue of sudden complications.

[0020] 4. This invention is also applicable to the fixation and care of indwelling catheters in different locations during long-term dialysis. Whether it is radial artery catheterization in the forearm, brachial artery catheterization in the upper arm, temporary catheterization in the neck, long-term catheterization under the clavicle, or peritoneal dialysis catheterization in the abdomen, the invention can achieve a stable fit and seal with the skin at the catheterization site by adjusting the inflation volume of the wrapping structure and the curvature of the matching structure. This will not cause excessive pressure on the catheter itself, while maintaining an effective waterproof seal. It is suitable for the protection needs of long-term dialysis patients in their daily activities, and can maintain stable protection and monitoring functions without frequent device replacement, reducing the cost and inconvenience of long-term care. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main structure of the protective device of the present invention; Figure 2 This is a schematic diagram of the curved structure of the main body of the protective device of the present invention; Figure 3 This is a cross-sectional structural diagram of the main body of the protective device of the present invention; Figure 4 This is a cross-sectional view of the pull-out structure and the retractable structure of the present invention; Figure 5 This is a schematic diagram of the tightening structure of the present invention; Figure 6 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 7 For the present invention Figure 3 Enlarged view of point B in the middle; Figure 8 For the present invention Figure 4 Enlarged view of point C in the middle; Figure 9 This is a schematic diagram illustrating the application of the present invention to the shoulder. Figure 10 This is a schematic diagram of the state of the present invention used in the arm; Figure 11 This is a schematic diagram of the state in which the present invention is used on the neck; Figure 12This is a schematic diagram of the unfolded structure of the present invention in the abdominal position; In the diagram: 1. Main body of the protective device; 11. Mounting frame; 12. Tightening structure; 2. Detection component; 21. Strain gauge; 3. Wrapping structure; 31. Airbag; 4. Monitoring component; 41. Rubber frame; 411. Slide groove; 42. Piezoelectric film; 5. Fitting structure; 6. Pull-out structure; 61. Limiting cylinder; 62. Pull bolt; 7. Retraction structure; 71. Retraction rod; 72. Spring; 73. Pull-out rope; 8. Control system; 81. Control panel. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1: As Figures 1-8 and Figure 10 As shown, the present invention provides a wrap-around waterproof sealing protection device for dialysis catheters, including a protection device body 1 and a control system 8. The protection device body 1 includes two sets of mounting frames 11, a detection component 2 is provided inside the mounting frames 11, a wrapping structure 3 is provided between the mounting frames 11, a monitoring component 4 is provided inside the wrapping structure 3, a mating structure 5 is provided on the mounting frames 11, and a tightening structure 12 is connected to the wrapping structure 3. The tightening structure 12 is used to adjust the circumferential wrapping force of the wrapping structure 3 on the skin of the arm.

[0024] In use, the two mounting frames 11 are first fixed to the skin of the arm on both sides of the dialysis catheter. Then, the wrapping structure 3 is adjusted to completely cover the exposed area of ​​the dialysis catheter. Subsequently, the tightening structure 12 is operated to inflate or de-inflate the wrapping structure 3, making it fit tightly against the arm skin, achieving complete sealing and waterproofing of the dialysis catheter. During use, the monitoring component 4 on the inside continuously collects pulse rate data at the wearing site, and the detection component 2 simultaneously detects the sealing pressure at the contact point between the wrapping structure 3 and the skin. The data is transmitted to the control system 8 in real time. When the wrapping loosens or the pressure becomes abnormal due to limb movement, the control system 8 can automatically adjust the tightening structure 12 to compensate, ensuring sealing stability and wearing comfort.

[0025] The monitoring component 4 includes a rubber frame 41, which is installed inside the wrapping structure 3. A groove 411 is provided inside the rubber frame 41, and a thin film is placed between the grooves 411. A piezoelectric thin film 42 is slidably installed between the rubber frames 41, with its output surface in contact with the skin. A pull-out structure 6 is installed at each end of the piezoelectric thin film 42. The piezoelectric thin film 42 can adhere to the skin surface of the arm to sense pressure changes caused by pulse and convert these pressure changes into electrical signals that are transmitted to the control system 8. The pull-out structure 6 includes a limiting cylinder 61 and a pull bolt 62. The limiting cylinder 61 is installed on the mounting frame 11, and the pull bolt 62 is located inside the limiting cylinder 61. A retraction structure 7 is provided inside the pull bolt 62. The contraction structure 7 includes a contraction rod 71 and two sets of springs 72. Springs 72 are installed at both ends of the contraction rod 71. One end of each spring 72 is fixedly connected to the inner wall of the pull bolt 62, and the other end is fixedly connected to the contraction rod 71. A pull rope 73 is installed on the outside of the contraction rod 71, and the other end of the pull rope 73 is connected to the piezoelectric film 42. Pulling the pull bolt 62 outward adjusts the position of the piezoelectric film 42 within the groove 411, aligning it with the point where the arterial pulsation is most pronounced. When released, the springs 72 push the contraction rod 71 to apply a constant preload via the pull rope 73, maintaining the tension and adhesion of the piezoelectric film 42.

[0026] The wrapping structure 3 includes an airbag 31 made of thermoplastic polyurethane. One end of the airbag 31 has an air vent and a connecting valve, which cooperates with the tightening structure 12. Several memory metal wires are installed inside the airbag 31, each wrapped with a protective film and equidistantly positioned within the airbag 31. The mounting frame 11 is made of rubber and also contains memory metal wires. When the airbag 31 is inflated or deflated, it adapts to the contours of the arm with the memory metal wires, forming a uniform annular sealing band.

[0027] The detection component 2 includes strain gauges 21, which are equidistantly mounted inside the mounting frame 11 and connected to the control system 8 via wires. The tightening structure 12 includes an air pump and a suction pump, which are connected to a connecting valve via connectors. The air pump contains a wireless connection module. Based on the pressure data fed back by the strain gauges 21, the control system 8 automatically controls the air pump or suction pump to inflate or deflate the airbag 31, maintaining the sealing pressure within a preset safety threshold. The control system 8 is installed outside the airbag 31 and has a control panel 81. It is connected to the suction pump via a wireless connection module and to the detection component 2 and monitoring component 4 via wires for receiving pressure data and pulse signals and issuing alarm prompts based on preset thresholds.

[0028] Example 2: Figure 9As shown, based on Embodiment 1, the difference in this embodiment is that: the main body 1 of the protective device is an arc-shaped semi-closed ring structure adapted to the curve of the shoulder, used for long-term dialysis catheter placement in the shoulder and subclavian region; the mounting frame 11 is made of silicone and is a curved strip that matches the clavicle and deltoid muscle region; the fitting structure 5 includes a memory alloy wire embedded in the mounting frame 11, so that the mounting frame 11 can adaptively bend and shape according to the height and undulation of the patient's trapezius muscle and clavicle; the airbag 31 has a thickness gradient zone in the corresponding supraclavicular fossa and acromion region to adapt to the pressure distribution of the uneven surface of the shoulder; the airbag 31 has an arc-shaped incision on the side near the axilla to avoid excessive compression of the axillary blood vessels and lymphatic tissue; the groove 411 in the rubber frame 41 is arc-shaped, and its curvature matches the course of the subclavian artery; the piezoelectric film 42 slides along the arc-shaped groove 411 to fit the pulsating area of ​​the subclavian artery; the remaining structure and connection relationship are the same as in Embodiment 1.

[0029] Example 3: As Figure 11 As shown, based on Embodiment 1, the difference in this embodiment is that: the main body 1 of the protective device is a C-shaped non-closed ring structure adapted to the physiological curvature of the neck, used for short-term dialysis catheter placement in the neck; the two sets of mounting frames 11 correspond to the anterior and lateral regions of the neck; the inner arc surface of the airbag 31 is provided with an anti-slip textured layer to prevent the device from rotating or sliding longitudinally on the neck skin; the airbag 31 is embedded with a memory metal wire extending longitudinally along the cervical spine, and the memory metal wire is distributed in a wave shape to guide the airbag 31 to expand evenly towards the center of the neck during inflation, avoiding local point pressure on the carotid sinus and trachea; the piezoelectric film 42 can slide in the groove 411 along the direction of the carotid artery, so that it fits against the neck skin and detects the carotid artery pulsation frequency; the two ends of the mounting frame 11 are provided with rounded corner buffer pads to prevent the C-shaped opening end from damaging the neck skin when the patient's head is turned; the remaining structure and connection relationship are the same as in Embodiment 1.

[0030] Example 4: Figure 12As shown, based on Embodiment 1, the difference in this embodiment is that: the main body 1 of the protective device is a fully unfoldable, flexible, sheet-like, non-closed structure for peritoneal dialysis catheter placement; the wrapping structure 3 includes a flexible thermoplastic polyurethane base membrane and an airbag layer disposed on the base membrane; the airbag layer is composed of multiple interconnected honeycomb-shaped air chambers; after inflation, the honeycomb-shaped air chambers form a flexible sealing pad covering the catheter outlet area; the outer periphery of the base membrane is provided with medical pressure-sensitive adhesive or elastic bandage for temporarily fixing the wrapping structure 3 to the abdominal skin surface; the wrapping structure 3... The device includes a catheter exit hole with an annular sealing ring around it. The annular sealing ring contracts towards the center after the air bladder is inflated to grip the outer wall of the dialysis catheter. The monitoring component 4 includes a piezoelectric film array embedded in the inner side of the base membrane. The piezoelectric film array includes multiple sets of piezoelectric sensing units arranged along the direction of the rectus abdominis muscle to detect the pulsation signal of the superficial abdominal wall artery or the micro-vibration signal caused by changes in intra-abdominal pressure. The tightening structure 12 includes an external micro air pump that is detachably connected to the air inlet valve of the honeycomb air chamber through a flexible air guide tube. The remaining structure and connection relationship are the same as in Embodiment 1.

[0031] like Figures 1-12 As shown, the basic workflow of the device of the present invention when applied to different dialysis catheter insertion sites is as follows: First, depending on the patient's specific catheter placement site (arm, shoulder, neck, or abdomen), select the appropriate form of the protective device body 1—a closed ring, a semi-closed ring, or a fully unfolded sheet. Place or cover the protective device body 1 over the exposed area of ​​the dialysis catheter, so that the wrapping structure 3 covers the catheter outlet and the surrounding skin, and position the mounting frame 11 on the skin surface on both sides of the catheter. Next, the tightening structure 12 is activated. The tightening structure 12 inflates the airbag 31 of the wrapping structure 3 with air through an air pump, or extracts the air from the airbag 31 with an air pump. The airbag 31 is made of thermoplastic polyurethane, which has good elasticity and waterproof properties. During inflation or deflation, the memory metal wires equidistantly arranged inside it bend and deform adaptively along the skin contour of the patient's catheter insertion site, causing the airbag 31 and the rubber mounting frame 11 connected to it to fit tightly and flatly against the skin surface. The memory metal wires embedded in the mounting frame 11 in the structure 5 bend and shape synchronously, so that the mounting frame 11 always maintains uniform adhesion to the edge of the skin, thereby forming a continuous and complete annular or circumferential sealing band around the catheter outlet, achieving complete isolation from external moisture. During the tightening process, the detection component 2 installed inside the mounting frame 11—namely, the equally spaced strain gauges 21—detects the pressure data at the contact point between the mounting frame 11 and the skin in real time and transmits this pressure data to the control system 8. The control system 8 compares the real-time pressure value with the internally preset safe pressure threshold range. When the pressure value is lower than the lower limit of the safe threshold, there is a risk of seal failure. The control system 8 instructs the air pump in the tightening structure 12 to replenish the airbag 31 with air through the wireless connection module, increasing the wrapping and fitting force. When the pressure value is higher than the upper limit of the safe threshold, there is a risk of excessive compression. The control system 8 instructs the air pump to extract some gas from the airbag 31, reducing the wrapping and fitting force. Through this dynamic closed-loop adjustment mechanism, the device always maintains the sealing pressure within a reasonable range that ensures waterproof sealing effect without compressing the patient's blood vessels and affecting blood circulation. Simultaneously, the monitoring component 4, located inside the wrapping structure 3, is activated. The user pulls the pull plug 62 outward through the pull-out structure 6, causing the piezoelectric film 42 to slide within the groove 411 of the rubber frame 41 via the pull rope 73. This ensures that the output surface of the piezoelectric film 42 is precisely aligned with the most prominent arterial pulsation near the insertion site. After releasing the pull plug 62, the spring 72 in the contraction structure 7 pushes the contraction rod 71, continuously applying a constant preload force to the piezoelectric film 42 via the pull rope 73. This ensures that the output surface is stably attached to the skin and also buffers the traction disturbance caused by the patient's limb movements. When the artery undergoes periodic pressure changes with the heartbeat, the piezoelectric film 42 is compressed, generating a corresponding electrical signal. This electrical signal is transmitted to the control system 8 via wires, and after analysis and processing, the pulse frequency and waveform are displayed in real time. Throughout the dialysis and daily protection process, the control system 8 continuously receives and processes the sealing pressure data fed back by the detection component 2 and the pulse signal collected by the monitoring component 4. When the sealing pressure deviates from the preset safety threshold, or when the pulse signal shows abnormal fluctuations such as a heart rate that is too fast, too slow, or irregular, the control system 8 issues an alarm through the audible and visual alarm module to remind the patient or medical staff to intervene in a timely manner. At the same time, the control system 8 stores all monitoring data in its internal memory and can send it to a remote monitoring terminal through the wireless data transmission module for medical staff to view at any time. Thus, the device of the present invention provides reliable waterproof sealing protection while realizing continuous and intelligent monitoring and early warning of the vital signs of patients at different dialysis catheter placement sites.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A wrap-around waterproof sealing protection device for dialysis catheters, comprising a protection device body (1) and a control system (8), characterized in that: The main body (1) of the protective device includes at least one set of mounting frames (11), a detection component (2) is provided inside the mounting frame (11), a wrapping structure (3) is connected to the mounting frame (11), a monitoring component (4) is provided inside the wrapping structure (3), a mating structure (5) is provided on the mounting frame (11), and a tightening structure (12) is connected to the wrapping structure (3). The tightening structure (12) is used to adjust the wrapping force of the wrapping structure (3) on the skin. The main body (1) of the protective device has any one of the following forms: closed ring, semi-closed ring or fully unfolded sheet, to adapt to the wrapping and sealing of different dialysis catheter placement sites.

2. The encapsulated waterproof sealing protection device for dialysis catheters according to claim 1, characterized in that: The monitoring component (4) includes a rubber frame (41), which is installed inside the wrapping structure (3). A groove (411) is provided inside the rubber frame (41), and a piezoelectric film (42) is slidably installed between the grooves (411). The output surface of the piezoelectric film (42) is used to adhere to the skin and detect pulse signals. A pull-out structure (6) is connected to both ends of the piezoelectric film (42), and the pull-out structure (6) is used to adjust the position of the piezoelectric film (42) in the groove (411).

3. A wrap-around waterproof sealing protection device for dialysis catheters according to claim 2, characterized in that: The pull-out structure (6) includes a limiting cylinder (61) and a pull bolt (62) disposed inside the limiting cylinder (61). The pull bolt (62) is provided with a shrinking structure (7). The shrinking structure (7) includes a shrinking rod (71) and two sets of springs (72). The springs (72) are respectively connected to both ends of the shrinking rod (71). One end of the spring (72) is fixedly connected to the inner wall of the pull bolt (62), and the other end is fixedly connected to the shrinking rod (71). A pull rope (73) is connected to the outside of the shrinking rod (71), and the other end of the pull rope (73) is connected to the piezoelectric film (42).

4. A wrap-around waterproof sealing protection device for dialysis catheters according to claim 1, characterized in that: The wrapping structure (3) includes an airbag (31) made of thermoplastic polyurethane. A connecting valve is provided on the airbag (31), which cooperates with the tightening structure (12). Several memory metal wires are provided inside the airbag (31), and the memory metal wires are wrapped with a protective film. The memory metal wires are installed at equal intervals inside the airbag (31).

5. A wrap-around waterproof sealing protection device for dialysis catheters according to claim 4, characterized in that: The mounting frame (11) is made of rubber and has memory metal wires inside. The wrapping structure (3) works with the mounting frame (11) to form a closed ring, a semi-closed ring, or a fully unfolded sheet. The airbag (31) adapts to the skin contour of the arm, shoulder, neck, or abdomen after inflation or inhalation through the memory metal wires.

6. A wrap-around waterproof sealing protection device for dialysis catheters according to claim 1, characterized in that: The detection component (2) includes strain gauges (21), which are equidistantly installed inside the mounting frame (11). The strain gauges (21) are connected to the control system (8) via wires and are used to detect the contact pressure between the mounting frame (11) and the skin in real time.

7. A wrap-around waterproof sealing protection device for dialysis catheters according to claim 4, characterized in that: The tightening structure (12) includes an air pump and a vacuum pump. The air pump and the vacuum pump are connected to the connection valve of the airbag (31) through a connector. The air pump is equipped with a wireless connection module. The control system (8) automatically controls the air pump or the vacuum pump to inflate or de-inflate the airbag (31) according to the pressure data fed back by the detection component (2).

8. A wrap-around waterproof sealing protection device for dialysis catheters according to claim 1, characterized in that: When the wrapping structure (3) is in the form of a fully unfolded sheet, its edge is provided with a medical pressure-sensitive adhesive or elastic bandage to fix the wrapping structure (3) to the surface of the abdominal skin; the wrapping structure (3) is provided with a catheter outlet hole, and an annular sealing ring is provided around the catheter outlet hole.

9. A wrap-around waterproof sealing protection device for dialysis catheters according to claim 2, characterized in that: One or more piezoelectric films (42) are provided. When multiple films are provided, they form an array of piezoelectric films (42) for fitting the arterial pulsation area corresponding to different catheter placement sites. The rubber frame (41) is provided with an exhaust hole and a limiting plug for sealing the exhaust hole.

10. A wrap-around waterproof sealing protection device for dialysis catheters according to claim 1, characterized in that: The control system (8) is installed outside the wrapping structure (3). The control system (8) is equipped with a control panel (81). The control system (8) is connected to the tightening structure (12) via a wireless connection module. The control system (8) is electrically connected to the detection component (2) and the monitoring component (4) via wires. It is used to receive pressure data and pulse signals and issue alarm prompts according to preset thresholds.

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