Protective device for end of central venous catheter for hemodialysis

Abstract

According to the technical scheme, the protective device is characterized in that the protective device comprises a flexible fixing disc, a connecting port is formed in the top face of the flexible fixing disc, a protective cover is arranged on the top face of the connecting port, a groove is formed in the bottom face of the flexible fixing disc, and an adhesion patch is arranged in the groove; the clamping and fixing assembly is arranged on the inner circle wall face of the connecting port and used for clamping a catheter, by arranging a stirring gear, when medical staff need to fix the catheter, rotation of the stirring gear and the gear can be directly converted into linear motion of a toothed plate, switching between clamping and loosening is achieved, and when a fixing block makes contact with the catheter and continues to conduct clamping, the clamping and fixing assembly can be used for fixing the catheter. Elastic deformation of the spring can counteract part of clamping force, it is ensured that the fixing block is always in close contact with the outer wall of the catheter through resilience force of the spring, catheter displacement caused by too loose clamping is prevented, and follow-up hemodialysis treatment operation is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical equipment, in particular to a hemodialysis central venous catheter tip protection device. BACKGROUND

[0002] In hemodialysis treatment, the central venous catheter is the core access for establishing extracorporeal circulation for patients with end-stage renal disease, and its function stability and tip protection effect directly determine the safety and effectiveness of treatment. In China, about 35% of long-term hemodialysis patients rely on central venous catheters for dialysis, and the incidence of catheter-related complications (such as infection, thrombosis, and insufficient blood flow) is as high as 22%-38%, of which tip contamination and catheter displacement caused by fixed structure defects are one of the core causes.

[0003] The existing fixed structure mostly adopts a single elastic ring or a threaded tightening method, and the catheter is prone to displacement due to external force, inconvenient installation and removal, etc. When the catheter is inserted into the connection port of the protection device, if it is not fixed firmly, the catheter will displace, or the catheter will be clamped too much, and the drug flow in the catheter will be poor, affecting the subsequent hemodialysis treatment operation. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a hemodialysis central venous catheter tip protection device, which solves the problem of catheter insertion into the connection port of the protection device, which is not fixed firmly, which is prone to displacement, or which is clamped too much, which affects the subsequent hemodialysis treatment operation.

[0005] The above technical purpose of the present application is achieved by the following technical scheme: A hemodialysis central venous catheter tip protection device, comprising: a flexible fixing disc, the top surface of the flexible fixing disc is provided with a connection port, the top surface of the connection port is provided with a protection cover, the bottom surface of the flexible fixing disc is provided with a groove, and the inside of the groove is provided with an adhesive patch; a clamping and fixing assembly is arranged on the inner circular wall surface of the connection port for clamping the catheter.

[0006] By adopting the above technical scheme, the adhesive patch in the groove can be closely attached to the skin around the patient's catheter puncture point, which can fix the position of the entire device through adhesion, prevent the protection device from shifting or falling off, and form a preliminary seal with the skin on the edge of the adhesive patch to block external dust, sweat and other pollutants from entering the inside of the puncture point.

[0007] Preferably, the clamping and fixing assembly includes: two fixing blocks, both of which are disposed inside the connection port; two telescopic openings are formed on the inner circular wall of the connection port, the telescopic openings communicating with a cavity inside the connection port; a toothed plate is disposed inside the cavity; a limit block is fixedly installed on one side of the toothed plate; two mounting openings are formed on the top surface of the connection port; a toggle gear is rotatably mounted on one side of the mounting opening, the toggle gear meshing with the toothed plate; a connecting groove is formed on one side of the toothed plate; two springs are disposed inside the connecting groove; a telescopic plate is disposed inside the connecting groove, and one end of the telescopic plate is fixedly connected to the spring.

[0008] By adopting the above technical solution and setting a toggle gear, when medical staff need to fix the catheter, they can toggle the gear. Since the toggle gear meshes with the toothed plate in the cavity, the rotation of the gear will directly convert into the linear motion of the toothed plate. The movement of the toothed plate will directly push the fixing block closer to the catheter or away from the catheter, realizing the switching of clamping and releasing. When the fixing block contacts the catheter and continues to clamp it, the catheter will generate reverse pressure on the fixing block. At this time, the telescopic plate will retract into the connecting groove and squeeze the spring. The elastic deformation of the spring will offset part of the clamping force, forming a "flexible buffer": it can both avoid the deformation of the outer wall of the catheter due to excessive clamping force and ensure that the fixing block is always in close contact with the outer wall of the catheter through the rebound force of the spring, preventing the catheter from shifting due to excessive clamping and ensuring subsequent hemodialysis treatment operations.

[0009] Preferably, a rubber pad is fixedly adhered to the inner circular wall surface of the fixing block.

[0010] By adopting the above technical solution and setting a rubber pad, when the fixing block clamps the conduit, the rubber pad will deform slightly due to pressure, avoiding direct friction between the hard edge of the fixing block and the outer wall of the conduit, thus preventing the risk of scratching the conduit during clamping.

[0011] Preferably, the inner circular wall of the connection port has two mounting slots, a leak detector is fixedly installed inside the mounting slots, a micro controller is fixedly installed on the top surface of the connection port, an alarm is fixedly installed on the top surface of the connection port, and the micro controller is electrically connected to the alarm and the leak detector.

[0012] By adopting the above technical solution and setting up a leak detector, during hemodialysis treatment, leakage may occur at the connection between the connection port and the catheter tip due to sealing failure or catheter damage (such as cracks in the outer wall). Initially, the leakage amount is extremely small and easily covered by clothing or dressings. The leak detector can directly contact the potential leakage area at the connection point. When a small amount of leakage occurs, the detector can instantly capture the liquid signal and transmit the signal to the micro controller in real time. The micro controller immediately triggers the alarm, and the audible alarm can quickly attract the attention of medical staff, ensuring that the leakage is detected within 30 seconds after it occurs, thus gaining time for timely treatment.

[0013] Preferably, the bottom surface of the protective cover is provided with a magnetic groove, the top surface of the magnetic groove is fixedly installed with a permanent magnet, the top surface of the connection port is provided with a fixing groove, and the bottom surface of the fixing groove is fixedly installed with an adsorption ring.

[0014] By adopting the above technical solution, and by setting a permanent magnet, the magnetic force between the permanent magnet and the adsorption ring can automatically attract and align the protective cover. The magnetic force will guide the protective cover to quickly align with the position of the fixing groove, so that the top surface of the sealing surface of the protective cover is completely fitted, avoiding the local sealing gap caused by the misalignment of the traditional snap-on type.

[0015] Preferably, the top surface of the protective cover has an observation window.

[0016] By adopting the above technical solution and setting up an observation window, medical staff or patients can directly observe the real-time status of the catheter tip inside the protective cover without opening the magnetic protective cover. This reduces the number of times the protective cover is opened and closed by more than 90%, significantly reducing the chance of the catheter tip coming into contact with external contaminants and further reducing the risk of catheter-related infections.

[0017] Preferably, the bottom surface of the flexible fixing plate is provided with a disinfection cavity, the inside of the disinfection cavity is provided with an annular disinfection cotton, and the top surface of the annular disinfection cotton is provided with a slow-release disinfection sheet.

[0018] By adopting the above technical solution, and by setting up a ring-shaped disinfectant cotton, the slow-release disinfectant tablet slowly releases disinfectant factors, which penetrate into the ring-shaped disinfectant cotton, so that the disinfectant cotton maintains an effective disinfection concentration for a long time. The disinfectant cotton adheres to the skin around the puncture point, which can inhibit the growth of bacteria on the skin surface and block the spread of bacteria to the catheter tip or the inside of the puncture point, thereby reducing the risk of puncture point infection.

[0019] Preferably, the outer circular wall surface of the adhesive patch is provided with an ear piece.

[0020] By adopting the above technical solution and setting an ear piece, the adhesive patch can be easily peeled off from the skin surface by prying it off from the edge, which is cumbersome and time-consuming. The ear piece protrudes from the outside of the adhesive patch, and medical staff or patients can simply pinch the ear piece with their fingers and gently pull it upward or tear it outward to easily peel the edge of the adhesive patch off from the skin surface without having to repeatedly pry for the edge. In summary, the present invention mainly has the following beneficial effects: By setting up a toggle gear, when medical staff need to fix the catheter, they can toggle the gear. Since the toggle gear meshes with the toothed plate inside the cavity, the rotation of the gear is directly converted into the linear motion of the toothed plate. The movement of the toothed plate directly pushes the fixing block closer to the catheter or away from the catheter, realizing the switching between clamping and releasing. When the fixing block contacts the catheter and continues to clamp it, the catheter will generate reverse pressure on the fixing block. At this time, the telescopic plate will retract into the connecting groove and squeeze the spring. The elastic deformation of the spring will offset part of the clamping force, forming a "flexible buffer": it can both avoid the deformation of the outer wall of the catheter due to excessive clamping force and ensure that the fixing block is always in close contact with the outer wall of the catheter through the rebound force of the spring, preventing the catheter from shifting due to excessive clamping and ensuring subsequent hemodialysis treatment operations.

[0021] By setting up a leak detector, during hemodialysis treatment, leakage may occur at the connection between the connection port and the catheter tip due to seal failure or catheter damage (such as cracks in the outer wall). Initially, the leakage amount is extremely small and easily concealed by clothing or dressings. The leak detector can directly contact the potential leakage area at the connection point: when a small amount of leakage occurs, the detector can instantly capture the liquid signal and transmit the signal to the micro controller in real time. The micro controller immediately triggers the alarm, and the audible alarm can quickly attract the attention of medical staff, ensuring that the leakage is detected within 30 seconds after it occurs, thus gaining time for timely treatment. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the adhesive patch structure of the present invention; Figure 3 This is a schematic diagram of the fixing block structure of the present invention; Figure 4 This is a cross-sectional plan view of the connection port of the present invention; Figure 5 This is a schematic cross-sectional view of the toothed plate structure of the present invention; Figure 6 This is a schematic diagram of the protective cover structure of the present invention; Figure 7 This is a schematic diagram of the disinfection chamber structure of the present invention.

[0023] Reference numerals: 1. Flexible fixing plate; 2. Connection port; 3. Protective cover; 4. Groove; 5. Adhesive patch; 6. Fixing block; 7. Telescopic opening; 9. Toothed plate; 10. Limiting block; 11. Cavity; 12. Mounting port; 13. Actuating gear; 14. Connecting groove; 15. Spring; 16. Telescopic plate; 17. Rubber pad; 18. Magnetic groove; 19. Permanent magnet; 20. Fixing groove; 21. Adsorption ring; 22. Observation window; 23. Disinfection chamber; 24. Annular disinfection cotton; 25. Slow-release disinfection tablet; 26. Mounting groove; 27. Leakage detector; 28. Microcontroller; 29. ​​Alarm; 30. Ear plate. Detailed Implementation

[0024] 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. Example

[0025] refer to Figures 1-7A protective device for the tip of a central venous catheter used in hemodialysis includes: a flexible fixing plate 1, a connection port 2 on the top surface of the flexible fixing plate 1, a protective cover 3 on the top surface of the connection port 2, a groove 4 on the bottom surface of the flexible fixing plate 1, and an adhesive patch 5 disposed inside the groove 4; and a clamping and fixing assembly disposed on the inner circular wall of the connection port 2 for clamping the catheter. By using the adhesive patch 5, the catheter tip passes through the connection port 2, and the adhesive patch 5 inside the groove 4 can tightly adhere to the skin around the patient's catheter puncture point, thus fixing the entire device in place through adhesiveness. The protective cover 3 is positioned to prevent the protective device from shifting or falling off. On the other hand, the edge of the adhesive patch 5 can form a preliminary seal with the skin, preventing external dust, sweat, and other contaminants from entering the puncture point. A magnetic groove 18 is provided on the bottom surface of the protective cover 3, and a permanent magnet 19 is fixedly installed on the top surface of the magnetic groove 18. A fixing groove 20 is provided on the top surface of the connection port 2, and an adsorption ring 21 is fixedly installed on the bottom surface of the fixing groove 20. By setting the permanent magnet 19, the magnetic force between the permanent magnet 19 and the adsorption ring 21 automatically attracts and aligns them. The magnetic force guides the protective cover 3 to quickly align with the position of the fixing groove 20, so that the sealing surface of the protective cover 3 is aligned with the connection port 2. The top surface of the protective cover 3 fits perfectly, avoiding localized sealing gaps caused by misalignment in traditional snap-on designs. An observation window 22 is provided on the top surface of the protective cover 3. Through this window, medical staff or patients can directly observe the real-time status of the catheter tip inside the protective cover 3 without opening the magnetic protective cover 3, reducing the number of times the cover 3 is opened and closed by more than 90%. This significantly reduces the chance of the catheter tip coming into contact with external contaminants, further reducing the risk of catheter-related infections. A disinfection chamber 23 is provided on the bottom surface of the flexible fixing plate 1. An annular disinfection cotton 24 is placed inside the disinfection chamber 23, and a slow-release disinfection sheet 25 is placed on the top surface of the annular disinfection cotton 24. The slow-release disinfectant pad 25 slowly releases disinfectant factors, which penetrate into the ring-shaped disinfectant cotton 24, maintaining an effective disinfection concentration for a long time. The disinfectant cotton adheres to the skin around the puncture site, inhibiting bacterial growth on the skin surface and preventing the spread of bacteria to the catheter tip or puncture site, thus reducing the risk of puncture site infection. The outer circular wall of the adhesive patch 5 is provided with ear pieces 30. Because of the ear pieces 30, the adhesive patch 5 needs to be pried off from the edge when it is removed, which is cumbersome and time-consuming. The ear pieces 30 protrude from the outside of the adhesive patch 5. Medical staff or patients can simply pinch the ear pieces 30 with their fingers and gently pull upwards or tear outwards to easily peel the edge of the adhesive patch 5 off the skin surface without having to repeatedly pry the edge. Example

[0026] Based on the above embodiment 1, refer to Figure 1 , Figure 4 and Figure 5The clamping and fixing assembly includes two fixing blocks 6, both of which are disposed inside the connection port 2. Two telescopic openings 7 are formed on the inner circular wall of the connection port 2, connecting to a cavity 11 inside the connection port 2. A toothed plate 9 is disposed inside the cavity 11, and a limit block 10 is fixedly installed on one side of the toothed plate 9. Two mounting openings 12 are formed on the top surface of the connection port 2, and a turning gear 13 is rotatably mounted on one side of the mounting opening 12, meshing with the toothed plate 9. A connecting groove 14 is formed on one side of the toothed plate 9, containing two springs 15 and a telescopic plate 16. The telescopic plate 16 is fixedly connected to one end of each spring 15. By setting the turning gear 13, when medical personnel need to fix the catheter, turning the gear 13 directly converts the rotation of the gear into rotation of the toothed plate 9 because the turning gear 13 meshes with the toothed plate 9 inside the cavity 11. The linear motion of the toothed plate 9 directly pushes the fixing block 6 towards the catheter or away from the catheter, switching between clamping and releasing. When the fixing block 6 contacts the catheter and continues to clamp it, the catheter will exert reverse pressure on the fixing block 6. At this time, the telescopic plate 16 will retract into the connecting groove 14 and squeeze the spring 15. The elastic deformation of the spring 15 will offset part of the clamping force, forming a "flexible buffer": it avoids deformation of the outer wall of the catheter due to excessive clamping force, and ensures that the fixing block 6 is always in close contact with the outer wall of the catheter through the rebound force of the spring 15, preventing the catheter from shifting due to loose clamping and ensuring subsequent hemodialysis treatment. A rubber pad 17 is fixedly adhered to the inner circular wall of the fixing block 6. By setting the rubber pad 17, when the fixing block 6 clamps the catheter, the rubber pad 17 will undergo slight deformation due to pressure, avoiding the hard edge of the fixing block 6 directly rubbing against the outer wall of the catheter, and preventing the risk of scratching the catheter during clamping. Example

[0027] Based on the above embodiment 1 or 2, refer to Figure 4 , Figure 5 and Figure 6Two mounting slots 26 are provided on the inner circular wall of the connection port 2. A leak detector 27 is fixedly installed inside the mounting slot 26. A microcontroller 28 and an alarm 29 are fixedly installed on the top surface of the connection port 2. The microcontroller 28 is electrically connected to the alarm 29 and the leak detector 27. By setting the leak detector 27, during hemodialysis treatment, the connection between the connection port 2 and the catheter tip may leak due to seal failure or catheter damage (such as cracks in the outer wall). The initial leakage amount is extremely small and easily covered by clothing or dressings. The leak detector 27 can directly contact the potential leakage area at the connection. When a small amount of leakage occurs, the detector can instantly capture the liquid signal and transmit the signal to the microcontroller 28 in real time. The microcontroller 28 immediately triggers the alarm 29. The sound alarm can quickly attract the attention of medical staff and ensure that the leakage is detected within 30 seconds after it occurs, thus gaining time for timely treatment.

[0028] Working principle: Please refer to Figures 1-7 As shown, when using this hemodialysis central venous catheter tip protection device, the device is first initially fixed to the patient through the adhesive patch 5 in the groove 4 on the bottom surface of the flexible fixing plate 1. The adhesive patch 5 is tightly attached to the skin around the catheter puncture point, and its edge forms a preliminary seal with the skin. This can prevent the device from shifting or falling off, and also prevent external dust, sweat and other contaminants from entering the puncture point. If the adhesive patch 5 needs to be replaced later, medical staff or patients can directly pinch the ear piece 30 on the outer circular wall of the adhesive patch 5 and gently pull it upward or tear it outward to quickly peel the patch off the skin. There is no need to repeatedly pick at the edge, making the operation convenient and reducing skin damage. Next, precise clamping and fixation of the catheter is performed: After the tip of the hemodialysis central venous catheter is passed through connection port 2, it is securely clamped by the clamping and fixation components within connection port 2. Medical staff manually move gear 13 through the mounting port 12 on the top surface of connection port 2. Because gear 13 meshes with the toothed plate 9 within cavity 11, the rotation of the gear is converted into linear movement of the toothed plate 9 along cavity 11, which in turn drives the limiting block 10 and fixing block 6 on one side of the toothed plate 9 to move synchronously, causing the two fixing blocks 6 to move closer to the catheter; when the inner side of the fixing block 6... When the rubber pad 17 contacts and continuously clamps the outer wall of the catheter, the reverse pressure generated by the catheter on the fixing block 6 will push the telescopic plate 16 to retract into the connecting groove 14 of the toothed plate 9, while squeezing the spring 15 in the connecting groove 14. The elastic deformation of the spring 15 will offset part of the clamping force, forming a flexible buffer. This avoids the outer wall of the catheter from being deformed and the inner lumen from being obstructed due to excessive clamping, and also ensures that the fixing block 6 is in close contact with the outer wall of the catheter through the spring rebound force, preventing the catheter from shifting due to excessive clamping, and ensuring the stability and flow of the catheter during subsequent hemodialysis treatment. After the catheter is clamped, the protective cover 3 is closed to achieve a tight seal at the end: the permanent magnet 19 in the magnetic groove 18 on the bottom of the protective cover 3 attracts the adsorption ring 21 in the fixing groove 20 on the top of the connection port 2. The magnetic force guides the protective cover 3 to automatically and accurately align and fit against the top of the connection port 2, so that the sealing surface of the protective cover 3 fits completely against the connection port 2, avoiding the local sealing gap caused by the misalignment of the traditional snap-fit ​​type, and completely isolating the external contaminants from contact with the catheter end. During non-dialysis treatment periods, medical staff or patients can directly observe the real-time status of the internal catheter end through the observation window 22 on the top of the protective cover 3 without opening the protective cover 3.

[0029] Simultaneously, the device can also achieve long-term disinfection of the puncture site and real-time early warning of leakage: the slow-release disinfectant pad 25 in the disinfection chamber 23 on the bottom surface of the flexible fixing plate 1 slowly releases disinfectant factors, which penetrate into the annular disinfectant cotton 24, keeping the disinfectant cotton at an effective disinfection concentration for a long time. The annular disinfectant cotton 24 adheres to the skin around the puncture site, which can inhibit the growth of bacteria on the skin surface and block the spread of bacteria to the catheter tip or the interior of the puncture site, reducing the risk of infection at the puncture site; while the leakage detector 27 in the groove 26 on the inner circular wall of the connection port 2 continuously monitors the connection between the connection port 2 and the catheter tip. If a small amount of leakage occurs due to seal failure, catheter damage, or other reasons, the leakage detector 27 will instantly capture the liquid signal and transmit it to the microcontroller 28. After the microcontroller 28 confirms a valid leakage by comparing it with a preset threshold, it will immediately trigger the alarm 29 on the top of the connection port 2. The dual sound and light alarm will quickly attract the attention of medical staff and ensure that the leakage is detected within 30 seconds. This will buy time for timely handling (such as resealing or replacing the catheter) and avoid problems such as blood loss, infection, or treatment interruption caused by leakage, thus comprehensively ensuring the safety and continuity of hemodialysis treatment. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A protective device for the tip of a central venous catheter used in hemodialysis, characterized in that, include: A flexible fixing plate (1) is provided with a connection port (2) on its top surface and a protective cover (3) on its top surface. A groove (4) is provided on the bottom surface of the flexible fixing plate (1) and an adhesive patch (5) is provided inside the groove (4). A clamping and fixing component is disposed on the inner circular wall of the connection port (2) for clamping the conduit.

2. The protective device for the tip of a central venous catheter used for hemodialysis according to claim 1, characterized in that, The clamping and fixing assembly includes: Two fixing blocks (6) are set inside the connection port (2). Two telescopic openings (7) are opened on the inner circular wall of the connection port (2). The telescopic openings (7) are connected to the cavity (11) inside the connection port (2). A toothed plate (9) is set inside the cavity (11). A limit block (10) is fixedly installed on one side of the toothed plate (9). Two mounting openings (12) are opened on the top surface of the connection port (2). A toggle gear (13) is rotatably installed on one side of the mounting opening (12). The toggle gear (13) meshes with the toothed plate (9). A connecting groove (14) is opened on one side of the toothed plate (9). Two springs (15) are set inside the connecting groove (14). A telescopic plate (16) is set inside the connecting groove (14). The telescopic plate (16) is fixedly connected to one end of the spring (15).

3. The protective device for the tip of a central venous catheter used for hemodialysis according to claim 2, characterized in that, A rubber pad (17) is fixedly adhered to the inner circular wall surface of the fixing block (6).

4. The protective device for the tip of a central venous catheter used for hemodialysis according to claim 1, characterized in that, The inner circular wall of the connection port (2) has two mounting slots (26). A leak detector (27) is fixedly installed inside the mounting slot (26). A micro controller (28) is fixedly installed on the top surface of the connection port (2). An alarm (29) is fixedly installed on the top surface of the connection port (2). The micro controller (28) is electrically connected to the alarm (29) and the leak detector (27).

5. A protective device for the tip of a central venous catheter used for hemodialysis according to claim 1, characterized in that, The bottom surface of the protective cover (3) is provided with a magnetic suction groove (18), and a permanent magnet (19) is fixedly installed on the top surface inside the magnetic suction groove (18). The top surface of the connection port (2) is provided with a fixing groove (20), and an adsorption ring (21) is fixedly installed on the bottom surface inside the fixing groove (20).

6. A protective device for the tip of a central venous catheter used for hemodialysis according to claim 5, characterized in that, The top surface of the protective cover (3) is provided with an observation window (22).

7. A protective device for the tip of a central venous catheter used for hemodialysis according to claim 1, characterized in that, The bottom surface of the flexible fixed plate (1) is provided with a disinfection cavity (23), and the inside of the disinfection cavity (23) is provided with an annular disinfection cotton (24), and the top surface of the annular disinfection cotton (24) is provided with a slow-release disinfection sheet (25).

8. A protective device for the tip of a central venous catheter used for hemodialysis according to claim 1, characterized in that, The outer circular wall surface of the adhesive patch (5) is provided with an ear piece (30).

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