Device for preventing peritoneal dialysis tunnel infection or peritonitis

Abstract

The invention relates to the field of medical instruments, in particular to a device for preventing peritoneal dialysis tunnel infection or peritonitis, which comprises an annular base, and a fixing mechanism for fixing the base on the body surface of a patient is arranged on the base; a cover plate is detachably connected to one side of the base, a through groove is formed in the cover plate, the through groove is used for coiling an external short tube for peritoneal dialysis, a plurality of clamping mechanisms are arranged on the side wall of the through groove in the circumferential direction, and the clamping mechanisms are used for clamping and fixing tube heads of the external short tube; the side, away from the base, of the cover plate is rotationally connected with a sealing cover. A quick driving mechanism is further arranged on the cover plate and used for driving the clamping mechanism to execute releasing, clamping and displacement actions. While pathogens are effectively isolated, the convenience of daily use of a patient is improved.

Description

Technical Field

[0001] This invention relates to the field of medical devices, specifically to a device for preventing peritoneal dialysis tunnel infection or peritonitis. Background Technology

[0002] Peritoneal dialysis is one of the most important renal replacement therapies for patients with end-stage renal disease. It relies on a long-term indwelling peritoneal dialysis catheter, using the peritoneum as a semipermeable membrane to remove metabolic waste and water. However, catheter-related infections, especially tunnel infections and peritonitis, remain major causes of technical failures, increased hospitalization rates, and patient mortality. Infections often occur due to pathogens entering the catheter lumen (procedural contamination) or outside the lumen (spread of infection from the tunnel and exit point). Therefore, effectively protecting the catheter exit point and subcutaneous tunnel is crucial for infection prevention.

[0003] Current routine clinical preventative measures mainly include: regular exit site care and application of antibacterial ointments; using tape, fixation straps, or other devices to secure the catheter and reduce traction and friction; and providing patients with rigorous aseptic technique training. While these methods are fundamental, they have significant shortcomings, particularly in terms of ease of use, during long-term home self-management by patients.

[0004] Traditional dressing changes are cumbersome, requiring one hand to hold the catheter and the other to disinfect, apply medication, and attach it, which demands a high level of operational skill.

[0005] Conventional adhesive tape is prone to falling off due to sweat or humid environments, and repeated tearing and pasting can damage the skin;

[0006] Most of the fixing devices only focus on physical fixation and lack continuous airtight protection for the exit and tunnel sections, making it difficult to isolate water, dust and microorganisms that are frequently encountered;

[0007] While some complex protective devices offer good protection, the steps involved in putting them on and taking them off are numerous, time-consuming, and labor-intensive, making them unsuitable for continuous daily use.

[0008] Given the shortcomings of existing technologies, there is an urgent need for a new type of protective device that can significantly improve the convenience of daily use for patients while ensuring effective isolation of pathogens. Summary of the Invention

[0009] To address the aforementioned problems, this invention provides a device for preventing peritoneal dialysis tunnel infection or peritonitis, which improves the convenience of daily use for patients while ensuring effective isolation of pathogens.

[0010] To achieve the above objectives, the technical solution of the present invention is as follows: A device for preventing peritoneal dialysis tunnel infection or peritonitis includes an annular base, on which a fixing mechanism for fixing the base to the patient's body surface is provided; a cover plate is detachably connected to one side of the base, and a through groove is provided in the cover plate for coiling the external short tube used for peritoneal dialysis; a plurality of clamping mechanisms are arranged circumferentially on the side wall of the through groove for clamping and fixing the tube head of the external short tube; a sealing cap is rotatably connected to the side of the cover plate away from the base;

[0011] The cover plate is also equipped with a quick drive mechanism, which is used to drive the clamping mechanism to perform release, clamping and displacement actions.

[0012] The technical principles of the above solution are as follows:

[0013] The base is stably attached to the patient's abdominal skin by a fixing mechanism. The peritoneal dialysis catheter outlet and subcutaneous tunnel section are located within the base ring. The external short tube coil is placed in the through groove of the cover plate, and its head is reliably held by a circumferentially arranged clamping mechanism. After the sealing cover is closed, the through groove forms a sealed cavity, completely isolating the outlet and external short tube from the external environment, effectively preventing the intrusion of water, dust, and microorganisms, and reducing the risk of tunnel infection and peritonitis.

[0014] The patient only needs to unscrew the sealing cap with one hand to activate the quick-drive mechanism. This mechanism drives the clamping mechanism to automatically move the external short catheter tip out of the dialysis slot and maintain it in a stable suspended state. The patient can directly remove the cap of the external short catheter and connect it to the peritoneal dialysis dual-line system. Throughout the process, the patient does not need to directly touch the catheter body or tip, greatly reducing the possibility of operational contamination. After dialysis, the reverse drive can retract the catheter tip and reseal it in the dialysis slot.

[0015] By releasing the clamping mechanism from the external connector using the quick-release drive mechanism, the entire cover can be removed from the base. Then, by releasing the fixing mechanism, the base can be removed for easy outlet care or device cleaning.

[0016] The above approach has the following beneficial effects:

[0017] 1. This solution achieves physical isolation of the catheter outlet and subcutaneous tunnel through a continuously sealed environment created by the through-channel and sealing cap, effectively blocking the invasion of pathogens along the external pathway of the lumen. During dialysis, mechanical actuation replaces hand contact with the external catheter tip, further reducing the risk of intraluminal contamination and enhancing infection prevention capabilities through a dual approach.

[0018] 2. This solution simplifies the traditional multi-step, two-handed operation into a single-handed capping and starting motion, significantly reducing the skill requirements for patients, and is especially suitable for patients with limited mobility or hand function. The automatic removal and retraction function of the clamping mechanism avoids repeated manual coiling and pulling of the catheter, reducing catheter damage or contamination caused by improper operation.

[0019] Furthermore, the fixing mechanism includes a first fixing unit and a second fixing unit; the first fixing unit includes a pair of straps, one end of which is fixedly connected to the base, and the other end of which is provided with Velcro; the second fixing unit includes a plurality of adsorption holes opened on the base, and each adsorption hole is connected to a negative pressure mechanism, which is used to generate negative pressure in the adsorption holes.

[0020] Beneficial effects: The straps provide overall macroscopic fixation, with adjustable tightness via Velcro to accommodate different waist sizes; negative pressure adsorption achieves microscopic localized adhesion, ensuring close adhesion between the base and the skin for "surface contact" fixation. This dual fixation mechanism effectively resists displacement or slippage caused by body movement, clothing friction, or damp environments, making it especially suitable for patients with frequent daily activities.

[0021] Negative pressure adsorption disperses the fixing pressure through evenly distributed adsorption pores, avoiding the skin redness, itching, or damage caused by concentrated force from traditional tapes or straps. Adsorption fixation eliminates the need for frequent removal and reapplying, reducing physical irritation and damage to the epidermal barrier and facilitating long-term wear.

[0022] Furthermore, the negative pressure mechanism includes a groove formed in the base, a piston that slides within the groove, and a first protrusion on one side of the piston; a cylinder is also rotatably connected to one side of the groove, and a first spiral groove is formed on the outer circumference of the cylinder, the first spiral groove slidingly engaging with the first protrusion; a first gear is coaxially fixedly connected to one end of the cylinder, the first gear is driven by a first ring, and the first ring is rotatably connected to the outer side of the base.

[0023] Beneficial effects: Users only need to rotate the first ring on the outer side of the base to drive the cylinder to rotate via the gear set. The engagement of the first helical groove and the first protrusion on the cylinder converts the rotational motion into the linear reciprocating motion of the piston. This design simplifies the complex negative pressure generation process into a natural twisting action, which can be easily completed by the patient with one hand, greatly improving the efficiency of wearing and removing the device.

[0024] Furthermore, the clamping mechanism includes a movable groove on the side wall of the through groove, in which a clamping pad is slidably fitted; a right-angle groove is provided on the side wall of the movable groove, in which a locking block and a slider are slidably fitted; the locking block is fixedly connected to the clamping pad; a connecting rod is provided between the slider and the clamping pad, with both ends of the connecting rod rotatably connected to the slider and the clamping pad respectively; and a quick drive mechanism is used to drive the slider to reciprocate.

[0025] Beneficial effects: The sliding path design of the locking block within the right-angle groove allows it to slide into the horizontal locking section of the right-angle groove when the slider drives the clamping pad to the clamping position. This structure creates a mechanical self-locking mechanism, effectively resisting external vibrations or tension, ensuring that the external short pipe will never accidentally loosen in a sealed or moving state, greatly improving the reliability of the protection.

[0026] When the tube head needs to be released, the drive slider moves in the opposite direction, and the connecting rod first drives the locking block to exit from the horizontal locking section, releasing the self-locking, and then smoothly retracts the clamping pad.

[0027] Furthermore, the quick drive mechanism includes a second ring, which is rotatably connected to the outer side of the cover plate. The second ring is driven by a second gear, which is coaxially fixedly connected to a rotating shaft. The rotating shaft has a second helical groove circumferentially open, and the second helical groove is slidably fitted with a second protrusion, which is fixedly connected to the slider.

[0028] Beneficial effects: Users only need to rotate the second ring to automatically complete the entire process of unlocking, displacing (removing the tube head) or resetting and locking (retracting the tube head) of the clamping mechanism through the transmission of the second gear, rotating shaft and second spiral groove. This unifies the operation that may have involved multiple steps (such as pressing, flicking, and pulling) into an intuitive rotational action, which is particularly beneficial to patients with limited hand strength or dexterity, and significantly reduces the operation threshold and the risk of error.

[0029] Furthermore, a marking plate is detachably connected inside the base, and an opening is provided on one side of the marking plate.

[0030] Beneficial effects: The marking plate allows for permanent or semi-permanent marking on the skin surface using a medical marker to determine the course of the subcutaneous tunnel of the catheter, the surface projection of the deep cuff (polyester sheath), and the location of the exit point. This enables quick and accurate alignment using this "map" each time the base is changed or exit care is performed, ensuring that disinfection, dressing coverage, and device fixation always completely cover the entire high-risk tunnel area and exit, eliminating local exposure or blind spots in care caused by positioning errors.

[0031] Furthermore, the base is circumferentially provided with several first tenons and several first mortises, and the cover plate is circumferentially provided with several second tenons and several second mortises. The first tenons and second mortises correspond one-to-one, and the first mortises and second tenons correspond one-to-one. A first semicircle is rotatably connected inside any one of the first tenons, and a second semicircle is rotatably connected inside the corresponding second tenon. A torsion spring is axially provided inside the first semicircle. When the first tenon approaches the second mortise, the second tenon presses against the first semicircle, and the first semicircle rotates against the torsion force of the torsion spring. When the first tenon and the second mortise are mortised and tenoned, the first semicircle returns to its original position under the action of the torsion spring.

[0032] Beneficial effects: During connection, the user only needs to roughly align the cover plate with the base and press lightly. The tenon automatically yields by pressing against the other's semi-circular structure during contact, and automatically resets and locks itself at the moment of engagement using the force of the torsion spring, accompanied by a clear "click" tactile or audible feedback. The entire process requires no precise alignment, rotation, or complex operations, truly achieving "one-click engagement," greatly reducing the difficulty of operation, especially suitable for patients with poor hand dexterity. Once the tenon and tenon are engaged, the first and second semi-circles (or structural walls) reset under the action of the torsion spring form a mechanical interlock, effectively resisting axial tension and lateral torsion. This positive locking mechanism ensures that the cover plate will not accidentally loosen during daily activities or friction from clothing, maintaining the continuous airtightness of the protective cavity and fundamentally guaranteeing the core isolation and protection functions.

[0033] Furthermore, a pull wire is provided tangentially in the second semicircle.

[0034] Beneficial effects: Users do not need tools or to find specific points of force to pry open the second semicircle; they only need to gently pull the cable to directly drive the second semicircle to rotate, thereby releasing the interlock with the first semicircle. This design simplifies the unlocking action to the extreme, especially solving the practical difficulties for patients with weak hand strength, short nails, or severely limited finger dexterity, enabling barrier-free operation for all people.

[0035] Furthermore, an elastic layer is provided on the inner side of each clamping pad.

[0036] Beneficial effects: The elastic layer (such as medical silicone or elastomer) can form a buffer and fit between the rigid clamping mechanism and the catheter tip. When the clamping mechanism is driven, the elastic layer deforms, making the clamping force distribution more uniform and gentle. This avoids the risk of indentation, wear, or even rupture on the catheter surface caused by excessive local pressure, greatly extending the service life of expensive dialysis catheters and eliminating the potential for leakage or infection.

[0037] Furthermore, the clamping pad includes three operating states: release, clamping, and displacement.

[0038] When the clamping pad is in the released state, the slider and the clamping pad move in the same direction; when the clamping pad is in the clamped state, the slider and the clamping pad move in different directions; when the clamping pad is in the displacement state, the slider and the clamping pad move in different directions.

[0039] Beneficial effects: Released state: The slider and clamping pad are aligned, and the mechanism is in the unlocked position, allowing the catheter to be freely inserted or removed, facilitating initial placement or thorough cleaning.

[0040] Clamping state: Through the abrupt change in the direction of movement (such as a right-angle groove structure), the mechanism enters the self-locking position, forming a firm mechanical lock to ensure that the conduit is absolutely fixed during daily protection.

[0041] Displacement state: The slider and the clamping pad move in opposite directions, realizing the overall translation (moving out or retracting) of the catheter in the clamping state, which is a key action to connect the dialysis operation.

[0042] The three states are clearly defined and the transition paths are clear. The mechanical structure ensures the stability of each state and effectively prevents accidental state switching caused by vibration or accidental touch during use. Attached Figure Description

[0043] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the device for preventing peritoneal dialysis tunnel infection or peritonitis according to the present invention;

[0044] Figure 2 for Figure 1 A top view of a device for preventing peritoneal dialysis tunnel infection or peritonitis;

[0045] Figure 3 for Figure 2 Sectional view along the AA direction;

[0046] Figure 4 for Figure 3 Enlarged view of a portion of point M in the middle;

[0047] Figure 5 for Figure 4 A magnified view of a portion of point N in the middle.

[0048] The reference numerals in the accompanying drawings include: 1. Strap; 2. Base; 3. Cover plate; 4. Sealing cover; 5. Marking plate; 201. Adsorption hole; 202. Slide groove; 203. Piston; 204. Cylinder; 205. First spiral groove; 206. First ring; 207. First gear; 301. Through groove; 302. Movable groove; 303. Right angle groove; 304. Clamping pad; 305. Connecting rod; 306. Slider; 307. Rotating shaft; 308. Second protrusion; 309. Second ring; 310. Second gear; 311. First semicircle; 312. Second semicircle; 313. Pull wire; 501. Opening. Detailed Implementation

[0049] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0050] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0052] The following detailed description illustrates the specific implementation method:

[0053] Example:

[0054] As attached Figure 1 -Appendix Figure 5 The image shows a device for preventing peritoneal dialysis tunnel infection or peritonitis, comprising an annular base 2. A silicone layer, made of medical-grade silicone, is adhered to the side of the base 2 that contacts the patient's skin, providing a comfortable application experience. Preferably, a slot is formed on the inner wall of the base 2, and a marking plate 5 is detachably connected to the slot. An opening 501 is formed on one side of the marking plate 5. The marking plate 5 allows for permanent or semi-permanent marking of the direction of the subcutaneous catheter tunnel, the surface projection of the deep cuff (polyester sheath), and the location of the exit point on the skin using a medical marker. Simultaneously, the marking plate 5 also isolates the dressing from the patient's skin, further reducing the risk of infection.

[0055] The base 2 is provided with a fixation mechanism for fixing the base 2 to the patient's body surface; specifically, the fixation mechanism includes a first fixation unit and a second fixation unit; the first fixation unit includes a pair of straps 1, one end of each strap 1 is adhesively fixed to both sides of the base 2, and the other end of each strap 1 is adhesively fixed with Velcro; the second fixation unit includes a plurality of suction holes 201 opened on the base 2, each suction hole 201 being connected to a negative pressure mechanism, which is used to generate negative pressure within the suction holes 201. Specifically, in conjunction with the attached... Figure 3 Appendix Figure 4 and attached Figure 5As shown, the negative pressure mechanism includes a groove 202 formed in the base 2, a piston 203 slidably fitted in the groove 202, and a first protrusion (not shown in the figure) integrally formed on one side of the piston 203; a cylinder 204 is also rotatably connected to one side of the groove 202, and a first spiral groove 205 is formed on the outer circumference of the cylinder 204, the first spiral groove 205 slidably fitted with the first protrusion; a first gear 207 is coaxially fixedly connected to one end of the cylinder 204, the first gear 207 is drivenly connected to a first ring 206, a gear ring is coaxially fixedly connected to the first ring 206, the first ring 206 meshes with the first gear 207 through the gear ring, thereby realizing power transmission, and the first ring 206 is rotatably connected to the outer side of the base 2.

[0056] A cover plate 3 is detachably connected to one side of the base 2. In this embodiment, the base 2 and the cover plate 3 are detachably connected by mortise and tenon joints. Specifically, refer to the attached... Figure 5 As shown, the base 2 is circumferentially provided with a plurality of first tenons and a plurality of first mortises, the first tenons being integrally formed with the base 2. The cover plate 3 is circumferentially provided with a plurality of second tenons and a plurality of second mortises, the second tenons being integrally formed with the cover plate 3. The first tenons and second mortises correspond one-to-one, and the first mortises and second tenons correspond one-to-one. A first semicircle 311 is rotatably connected within any one of the first tenons, and a second semicircle 312 is rotatably connected within the corresponding second tenon. The first semicircle 311 and the second semicircle 312 form a complete circle. In some other embodiments, the first semicircle 311 and the second semicircle 312 may also adopt a hemispherical structure. A torsion spring is axially installed within the first semicircle 311, the torsion spring providing torque for the first semicircle 311 to return to its original position. When the first tenon approaches the second mortise, the second tenon presses against the first semicircle 311, and the first semicircle 311 rotates against the torsion spring torque. When the first tenon and the second mortise are mortised and tenoned together, the first semicircle 311 returns to its original position under the action of the torsion spring.

[0057] The cover plate 3 has a through groove 301 for storing the external short tube used for peritoneal dialysis. Several clamping mechanisms are circumferentially arranged on the side wall of the through groove 301 for clamping and fixing the tube head of the external short tube; specifically, refer to the attached... Figure 3 and attached Figure 4 As shown, the clamping mechanism includes a movable groove 302 formed on the side wall of the through groove 301. A clamping pad 304 is slidably fitted in the movable groove 302, and an elastic layer is bonded and fixed to the inner side of the clamping pad 304. A right-angle groove 303 is formed on the side wall of the movable groove 302. A locking block and a slider 306 are slidably fitted in the right-angle groove 303. The locking block is fixedly connected to the clamping pad 304. A connecting rod 305 is provided between the slider 306 and the clamping pad 304. The two ends of the connecting rod 305 are rotatably connected to the slider 306 and the clamping pad 304, respectively. Preferably, the corner of the right-angle groove 303 is also rounded to facilitate the switching of the moving direction of the locking block within the right-angle groove 303.

[0058] Specifically, as the card block changes its direction of movement within the right-angle slot 303, the clamping pad 304 experiences three operating states: release, clamping, and displacement.

[0059] When the clamping pad 304 is in the released state, the slider 306 and the clamping pad 304 move in the same direction. At this time, both the locking block and the slider 306 are located in the vertical section of the right-angle groove 303. When the clamping pad 304 is in the clamping state, the moving directions of the slider 306 and the clamping pad 304 change abruptly. At this time, the locking block switches from the vertical section to the horizontal section at the corner of the right-angle groove 303. When the clamping pad 304 is in the displacement state, the moving directions of the slider 306 and the clamping pad 304 are different. At this time, the locking block is displaced in the horizontal section of the right-angle groove 303, and the slider 306 is displaced in the vertical section of the right-angle groove 303.

[0060] A sealing cover 4 is rotatably connected to the side of the cover plate 3 away from the base 2, and the sealing cover 4 isolates the through groove 301 from the outside.

[0061] The cover plate 3 is also equipped with a quick-drive mechanism, which is used to drive the clamping mechanism to perform release, clamping, and displacement actions. Specifically, the quick-drive mechanism includes a second ring 309, which is rotatably connected to the outside of the cover plate 3. The second ring 309 is driven by a second gear 310, and a gear ring is also coaxially fixedly connected to the second ring 309. The second ring 309 meshes with the second gear 310 through the gear ring. The second gear 310 is coaxially fixedly connected to a rotating shaft 307. The rotating shaft 307 has a second spiral groove (not shown in the figure) circumferentially opened. The second spiral groove is slidably fitted with a second protrusion 308, which is fixedly connected to a slider 306. Preferably, a pull wire 313 is tangentially bound to the second semicircle 312. The other end of the pull wire 313 (i.e., the end away from the second semicircle 312) passes through the cover plate 3 and extends to the surface of the cover plate 3, so that the patient can unlock the locking of the first semicircle 311 and the second semicircle 312 by pulling the wire 313.

[0062] The specific implementation process is as follows:

[0063] Perform routine cleaning and disinfection of the patient's abdominal catheter exit site and surrounding skin, and allow it to dry. Remove the marking plate 5 from the base 2, and use a medical marker to clearly mark the precise location of the patient's subcutaneous tunnel, the deep Cuff surface projection point, and the catheter exit point on the surface of the marking plate 5. Then, insert the marking plate 5 into the slot of the base 2 for fixation.

[0064] Preliminary positioning: Hold the base 2 and align its annular center with the catheter outlet, and ensure that the markings on the marking plate 5 completely coincide with the actual anatomical location on the patient's body surface.

[0065] Negative pressure adsorption: The first ring 206 on the outer side of the rotating base 2 drives the cylinder 204 to rotate through the meshing of the gear ring and the first gear 207. The first spiral groove 205 on the cylinder 204 engages with the first protrusion on the piston 203, driving the piston 203 to slide outward in the groove 202, thereby generating negative pressure in all the connected adsorption holes 201, so that the base 2 is tightly and stably adsorbed onto the skin.

[0066] Reinforcement with strap 1: Wrap a pair of straps 1 around the patient's waist or abdomen, and adjust the tightness using Velcro to complete the auxiliary fixation of the base 2. At this time, the catheter outlet and tunnel section are located within the ring of the base 2, and the external short tube is led out through the opening 501 of the marking plate 5.

[0067] The external short tube is coiled and placed in the through groove 301 of the cover plate 3. The cover plate 3 is roughly aligned with the base 2, and light pressure is applied to align the tenons and mortises. During the pressing process, the second tenon will press the first semicircle 311 inside the first tenon, causing it to rotate and make room against the torsion spring force; when the tenon and mortise are fully engaged, the first semicircle 311 quickly returns to its original position under the action of the torsion spring, forming a mechanical interlock with the second semicircle 312 (or structure), and the cover plate 3 is firmly locked onto the base 2.

[0068] Clamping and sealing:

[0069] Initial release state: At this time, the clamping block and slider 306 of the clamping mechanism are located in the vertical section of the right angle groove 303, and the clamping pad 304 is in the open (released) state, which is convenient for inserting the external short pipe head.

[0070] To switch to the clamping state: Rotate the second ring 309 on the cover plate 3 clockwise. This drives the rotating shaft 307 to rotate via gear transmission. The second helical groove on the rotating shaft 307 drives the cooperating second protrusion 308, causing the slider 306 to move downwards in the vertical section of the right-angle groove 303. The slider 306, through the connecting rod 305, drives the clamping pad 304 to move inwards, clamping the end of the external short tube. Simultaneously, the connecting rod 305 pushes the locking block to the corner of the right-angle groove 303.

[0071] As the second ring 309 continues to rotate, the slider 306 continues to move downwards a preset distance (e.g., 1 cm). At this time, the connecting rod 305 pushes the locking block from the vertical section of the right-angle slot 303 into the horizontal section. This process forces the clamping pad 304 to produce a slight displacement, allowing its inner elastic layer to fully adhere to the tube head and apply a stable clamping force. After the locking block slides into the horizontal section, it forms a self-locking mechanism, and the tube head is reliably fixed.

[0072] Rotate the sealing cap 4 to completely cover the through groove 301. At this time, the external short pipe is in a closed and dry environment formed by the base 2, the cover plate 3 and the sealing cap 4, effectively isolated from the outside world.

[0073] dialysis procedure

[0074] Preparation: After the patient cleans their hands, unscrew the sealing cap 4.

[0075] Remove the conduit: After the sealing cap 4 is opened, continue to rotate the second ring 309 in the same direction (clockwise). The continuous rotation of the shaft 307 drives the second protrusion 308 that cooperates with it through the second spiral groove on it, causing the slider 306 to continue to move downward along the vertical section of the right angle groove 303.

[0076] At this point, the locking block is located in the horizontal section of the right-angle slot 303 (the locked state for normal protection). The continued downward movement of the slider 306 pushes the locking block forward (away from the base 2) along the horizontal section of the right-angle slot 303 via the connecting rod 305. This action forces the external short pipe head, which is already fixed by the clamping pad 304, to smoothly slide out of the through slot 301 until it reaches a position convenient for connection. Throughout the process, the pipe head remains clamped (i.e., in a displacement state), ensuring its stability and preventing wobbling.

[0077] At this point, the catheter tip has been safely and stably removed. The patient simply removes the cap from the external short catheter tip and connects it to the sterile interface of the dual peritoneal dialysis system to begin peritoneal dialysis treatment. The entire procedure does not require direct hand contact with the external short catheter.

[0078] After dialysis treatment, the patient should first disconnect the sterile interface of the peritoneal dialysis dual-connection system from the external short tube tip. Then, immediately replace the sterile cap on the external short tube tip.

[0079] Rotate the second ring 309 counterclockwise. The rotating shaft 307 then reverses direction, driving the second protrusion 308 through the second spiral groove, which in turn causes the slider 306 to move upward along the vertical section of the right-angle groove 303.

[0080] The upward movement of slider 306 first drives the locking block to move back (towards the base 2) along the horizontal section of right-angle groove 303 via connecting rod 305, thereby causing the tube head fixed by clamping pad 304 to retract smoothly into through groove 301 (the reverse process of displacement state).

[0081] Stop rotating the second ring 309 once the end of the external short pipe has completely retracted into the through groove 301. Then rotate the sealing cap 4 to completely cover the through groove 301. The device returns to its normal sealed state, providing continuous protection for the outlet and conduit.

[0082] Disassembly and cleaning of the device (e.g., when outlet care is required):

[0083] Unlock cover 3: When it is necessary to open the device for outlet care or cleaning of components, continue to rotate the second ring 309 counterclockwise, the slider 306 continues to move upward, pushing the block from the horizontal section to the vertical section, thereby freeing the clamping pad 304 from the constraint of the external short tube.

[0084] The patient can gently pull the pull wire 313 exposed on the surface of the cover plate 3. The pull wire 313 tangentially pulls the second semicircle 312, causing it to rotate, thereby releasing the mechanical interlock with the first semicircle 311.

[0085] After the lock is released, the cover plate 3 can be easily lifted upwards to separate it from the base 2 (all tenons disengage from the mortises).

[0086] First, unfasten the Velcro on the strap 1 to release its fixation. Then, rotate the first ring 206 on the outer side of the base 2 in the opposite direction. This operation drives the piston 203 to slide outward, releasing the negative pressure in the suction hole 201, causing the base 2 to loosen from the skin, and then the base 2 can be removed.

[0087] Follow the standard procedure to care for the patient's catheter exit site. Once the skin is completely dry, reinsert the device.

[0088] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A device for preventing peritoneal dialysis tunnel infection or peritonitis, comprising an annular base (2), wherein the base (2) is provided with a fixing mechanism for fixing the base (2) to the patient's body surface; characterized in that, A cover plate (3) is detachably connected to one side of the base (2). A through groove (301) is provided in the cover plate (3). The through groove (301) is used to hold the external short tube used for peritoneal dialysis. Several clamping mechanisms are arranged circumferentially on the side wall of the through groove (301). The clamping mechanisms are used to clamp and fix the tube head of the external short tube. A sealing cover (4) is rotatably connected to the side of the cover plate (3) away from the base (2). The cover plate is also equipped with a quick drive mechanism, which is used to drive the clamping mechanism to perform release, clamping and displacement actions.

2. The device for preventing peritoneal dialysis tunnel infection or peritonitis according to claim 1, characterized in that, The fixing mechanism includes a first fixing unit and a second fixing unit; the first fixing unit includes a pair of straps (1), one end of each strap (1) is fixedly connected to the base (2), and the other end of each strap (1) is provided with Velcro; the second fixing unit includes a plurality of adsorption holes (201) opened on the base (2), each adsorption hole (201) is connected to a negative pressure mechanism, which is used to generate negative pressure in the adsorption hole (201).

3. The device for preventing peritoneal dialysis tunnel infection or peritonitis according to claim 2, characterized in that, The negative pressure mechanism includes a slide groove (202) opened in the base (2), a piston (203) is slidably fitted in the slide groove (202), and a first protrusion is provided on one side of the piston (203); a cylinder (204) is also rotatably connected to one side of the slide groove (202), and a first spiral groove (205) is opened in the outer circumference of the cylinder (204), and the first spiral groove (205) is slidably fitted with the first protrusion; a first gear (207) is coaxially fixedly connected to one end of the cylinder (204), and the first gear (207) is driven by a first ring (206), and the first ring (206) is rotatably connected to the outer side of the base (2).

4. The device for preventing peritoneal dialysis tunnel infection or peritonitis according to claim 3, characterized in that, The clamping mechanism includes a movable groove (302) opened on the side wall of the through groove (301), and a clamping pad (304) is slidably fitted in the movable groove (302); a right-angle groove (303) is opened on the side wall of the movable groove (302), and a locking block and a slider (306) are slidably fitted in the right-angle groove (303). The locking block is fixedly connected to the clamping pad (304), and a connecting rod (305) is provided between the slider (306) and the clamping pad (304). The two ends of the connecting rod (305) are rotatably connected to the slider (306) and the clamping pad (304) respectively; a quick drive mechanism is used to drive the slider (306) to move back and forth.

5. The device for preventing peritoneal dialysis tunnel infection or peritonitis according to claim 4, characterized in that, The quick drive mechanism includes a second ring (309), which is rotatably connected to the outer side of the cover plate. The second ring (309) is connected to a second gear (310) for transmission. The second gear (310) is coaxially fixedly connected to a rotating shaft (307). The rotating shaft (307) has a second spiral groove circumferentially opened. The second spiral groove is slidably fitted with a second protrusion (308). The second protrusion (308) is fixedly connected to a slider (306).

6. The device for preventing peritoneal dialysis tunnel infection or peritonitis according to claim 5, characterized in that, A marking plate (5) is detachably connected inside the base (2), and an opening (501) is provided on one side of the marking plate (5).

7. The device for preventing peritoneal dialysis tunnel infection or peritonitis according to claim 6, characterized in that, The base (2) is provided with several first tenons and several first mortises in the circumferential direction, and the cover plate (3) is provided with several second tenons and several second mortises in the circumferential direction. The first tenons and second mortises correspond one-to-one, and the first mortises and second tenons correspond one-to-one. A first semicircle (311) is rotatably connected inside any one of the first tenons, and a second semicircle (312) is rotatably connected inside the corresponding second tenon. A torsion spring is axially provided inside the first semicircle (311). When the first tenon approaches the second mortis, the second tenon presses the first semicircle (311), and the first semicircle (311) rotates against the torsion force of the torsion spring. When the first tenon is mortised and tenoned with the second mortis, the first semicircle (311) is reset under the action of the torsion spring.

8. The device for preventing peritoneal dialysis tunnel infection or peritonitis according to claim 7, characterized in that, The second semicircle (312) is tangentially provided with a pull line (313).

9. The device for preventing peritoneal dialysis tunnel infection or peritonitis according to claim 8, characterized in that, An elastic layer is provided on the inner side of the clamping pad (304).

10. The device for preventing peritoneal dialysis tunnel infection or peritonitis according to claim 9, characterized in that, The clamping pad (304) includes three operating states: release, clamping, and displacement. When the clamping pad (304) is in the released state, the slider (306) and the clamping pad (304) are in the same moving direction; when the clamping pad (304) is in the clamping state, the moving direction of the slider (306) and the clamping pad (304) changes abruptly; when the clamping pad (304) is in the displacement state, the moving direction of the slider (306) and the clamping pad (304) is different.

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