An improved anti-reflux peripherally inserted central venous catheter

Abstract

The invention discloses an improved anti-backflow peripherally inserted central venous catheter, which relates to the technical field of medical devices, including an extension pipe joint, an extension pipe, a connecting seat and a PICC catheter that are connected in sequence; a diversion valve, a silicone pad and an anti-backflow valve made of silicone are arranged in sequence in the extension pipe joint; an injector is inserted into the liquid inlet and the head of the diversion valve is pushed into the liquid control incision, so that the anti-backflow valve can be opened to form an infusion channel, thereby realizing infusion, blood transfusion and central venous pressure monitoring; when the injector is withdrawn, the silicone pad resets with its own elastic force to push the head of the diversion valve out of the liquid control incision, and the anti-backflow valve automatically closes the liquid control incision with its own elastic force to prevent blood backflow; it can effectively prevent blood backflow, reduce the risk of thrombosis in the infusion channel, and at the same time, the central venous pressure monitoring is supported by connecting the pressure measuring instrument through the diversion valve, thereby improving the applicability and safety of the central venous catheter; it solves the problem that the existing central venous catheter cannot take into account both blood backflow protection and central venous pressure monitoring.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an anti-reflux peripherally inserted central venous catheter. Background Art

[0002] A peripherally inserted central catheter (PICC) is a commonly used intravenous infusion tool, which is widely used in medium- to long-term intravenous infusion therapy in clinical practice. The PICC catheter is inserted through peripheral vein puncture, and the catheter tip is positioned in the superior vena cava, providing a safe, stable, and reusable infusion route for patients. However, the two common types of central venous catheters currently available are the front-end valve type and the front-end open type, but both of these two types of central venous catheters have their own deficiencies and cannot fully meet the clinical needs of patients. There is an urgent need for an improved anti-reflux central venous catheter to optimize performance.

[0003] Limitations of existing central venous catheters:

[0004] (1) The tip of the front-end valve type catheter is provided with a one-way valve, which can effectively prevent blood reflux and reduce the risk of thrombosis and catheter blockage. However, this design requires a certain pressure to open the valve, resulting in the following problems:

[0005] 1.1. Unable to monitor central venous pressure (CVP): The valve blocks the direct pressure conduction with the central vein, and the central venous pressure cannot be detected, making the front-end valve type catheter unable to be used to evaluate the hemodynamic status of patients.

[0006] 1.2. Usage limitations: For patients who require accurate central venous pressure monitoring (such as critically ill patients), this type of catheter cannot meet the needs.

[0007] (2) The front-end open type catheter is directly open at the catheter tip and can accurately monitor the central venous pressure, but its open design also brings the following hidden dangers:

[0008] 2.1. Blood reflux and thrombosis risk: Due to the lack of a reflux protection mechanism, changes in the patient's body position or catheter manipulation may cause blood reflux into the catheter lumen, increasing the risk of thrombosis.

[0009] 2.2. Catheter blockage problem: Once a thrombus forms, it may cause catheter blockage, affecting the continuity and safety of treatment, and even requiring catheter removal and reinsertion.

[0010] The existing central venous catheter structures and performances have certain functional advantages in different aspects, but they all have limitations and cannot simultaneously take into account the functions of blood reflux protection and central venous pressure monitoring. There is a technical gap and they cannot fully meet the clinical needs of patients.

[0011] Therefore, there is a need for technical improvements in central venous catheters, which can not only make up for the deficiencies of existing technologies, but also significantly improve the safety, effectiveness of clinical treatment and patient experience.

[0012] In summary, it is found that the existing technologies have at least the following technical problems:

[0013] The existing central venous catheters have the technical problem that they cannot take into account both blood backflow prevention and central venous pressure monitoring at the same time. Summary of the Invention

[0014] The purpose of the present invention is to provide an improved anti-reflux peripherally inserted central venous catheter to solve the technical problem that the existing central venous catheters cannot take into account both blood backflow prevention and central venous pressure monitoring at the same time.

[0015] The many technical effects that can be produced by the preferred technical solutions among the many technical solutions provided by the present invention are described in detail below.

[0016] To solve the above technical problems, the present invention provides the following technical solutions:

[0017] The present invention provides an improved anti-reflux peripherally inserted central venous catheter, including an extension tube connector, with a liquid inlet and a liquid outlet provided at both ends of the extension tube connector; the liquid inlet is used to connect the injector to be connected; a valve chamber is provided inside the extension tube connector, and a diversion valve, a silica gel pad and an anti-reflux valve made of silica gel are sequentially installed in the valve chamber along the direction of the flowing-in liquid; wherein, a liquid control notch is provided on the anti-reflux valve, and the shape of the liquid control notch is a straight line; the head of the diversion valve faces the surface of the anti-reflux valve away from the liquid outlet, and the outer diameter of the head of the diversion valve is smaller than the length of the liquid control notch; the injector is inserted into the liquid inlet, and the head of the diversion valve is pushed into the anti-reflux valve to open the liquid control notch of the anti-reflux valve. At the same time, the injector is communicated with the tail of the diversion valve to form an infusion channel for infusion or blood transfusion and for detecting the central venous pressure; when the injector withdraws from the liquid inlet, the thrust of the diversion valve disappears, the silica gel pad restores its elastic deformation and pushes the head of the diversion valve out of the liquid control notch, and the elastic deformation of the anti-reflux valve restores to close the liquid control notch and close the infusion channel; and an extension tube, a connection seat and a PICC catheter that are sequentially communicated, the extension tube is communicated with the liquid outlet of the extension tube connector; and a catheter clamp, the catheter clamp is arranged on the extension tube, and the catheter clamp is used to cut off or open the channel of the extension tube.

[0018] In one embodiment, a limiting chamfer is provided at one end of the valve chamber adjacent to the liquid outlet to limit the opening angle of the anti-reflux valve and increase the number of opening and closing cycles of the anti-reflux valve.

[0019] In one embodiment, a guiding boss is provided between the head and the tail of the diversion valve; both end faces of the silica gel pad are respectively abutted against the guiding boss and the check valve; the surface of the guiding boss facing the liquid inlet is detachably abutted against the inner end face of the valve placement cavity adjacent to the liquid inlet; the circumferential curved surface of the guiding boss is slidably connected to the inner wall surface of the valve placement cavity and forms a seal.

[0020] In one embodiment, the tail of the diversion valve extends into the liquid inlet, and the circumferential curved surface of the tail of the diversion valve forms a seal at the junction of the valve placement cavity and the liquid inlet; an exhaust hole is provided on the extension pipe joint, and the exhaust hole communicates with the valve placement cavity to discharge the gas in the valve placement cavity when the diversion valve exits the liquid control notch.

[0021] In one embodiment, during the process of the head of the diversion valve being pushed into the liquid control notch, the surface of the guiding boss facing the liquid inlet is separated from the inner end face of the valve placement cavity adjacent to the liquid inlet to form an air cavity, and external gas enters the air cavity through the exhaust hole to form normal pressure, so as to reduce the resistance of compressing the silica gel pad; during the process of the diversion valve exiting the liquid control notch, the gas in the air cavity is discharged outside the extension pipe joint through the exhaust hole, so as to reduce the resistance of the silica gel pad to rebound.

[0022] In one embodiment, an exhaust groove is provided on the circumferential curved surface of the guiding boss, one side of the exhaust groove is flush with the surface of the guiding boss facing the liquid inlet, and the width of the exhaust groove is less than or equal to the diameter of the exhaust hole; the exhaust groove is used to provide an initial space in the valve placement cavity for the intake or exhaust of the exhaust hole.

[0023] In one embodiment, the head of the diversion valve is provided with a guiding taper; the guiding taper is used to gradually open or close the liquid control notch.

[0024] In one embodiment, a guiding fillet is provided at the end of the head of the diversion valve; the guiding fillet is used to guide the head of the diversion valve to enter the liquid control notch in a smooth contact manner.

[0025] In one embodiment, a rebound reinforcing rib is provided on the surface of the check valve facing the liquid outlet, and the rebound reinforcing rib is used to accelerate the closing of the liquid control notch; a rib groove corresponding to the position and shape of the rebound reinforcing rib is provided in the extension pipe joint, and the rib groove is arranged along the path of the straightening and bending of the rebound reinforcing rib, and is used to accommodate the rebound reinforcing rib when the check valve is closed or opened.

[0026] In one of the embodiments, a rubber ring accommodating groove is provided on the outer peripheral curved surface of the extension pipe joint, and the rubber ring accommodating groove is provided adjacent to the surface of the anti-return valve facing the liquid outlet; a guide through hole is provided in the tube wall of the extension tube, and the axis of the guide through hole is inclined toward the rebound reinforcement rib; both ends of the guide through hole are connected to the rubber ring accommodating groove and the rib groove; a guide column is slidably installed in the guide through hole, and the guide column is sealingly abutted against the hole wall of the guide through hole; a rebound rubber ring is installed in the rubber ring accommodating groove; both ends of the guide column are respectively abutted against the rebound reinforcement rib and the rebound rubber ring, and the elastic force of the rebound rubber ring drives the guide column to push the rebound reinforcement rib to accelerate the closing of the liquid control incision.

[0027] The beneficial effects of the present invention are as follows:

[0028] In order to improve the safety and applicability of clinical use, it is necessary to improve the technical improvement of central venous catheters, which can improve the applicability of central venous catheters and achieve the performance of preventing blood backflow and supporting central venous pressure monitoring. The structure of the improved anti-backflow peripherally inserted central venous catheter provided by the present invention solves the technical problem that blood backflow protection and central venous pressure monitoring cannot be taken into account at the same time in the prior art, which is specifically embodied in:

[0029] (1) Blood backflow protection: By setting an anti-return valve with a straight-line liquid control incision in the extension tube connector, combined with the elastic deformation and elastic force of the silicone pad, the automatic closing function of the infusion channel is realized; when the liquid inlet of the extension tube connector is not inserted into the injector, the anti-return valve made of silicone relies on its own elastic force and self-tightness to tightly close the liquid control incision, which can effectively prevent blood backflow, reduce the risk of thrombosis and tube blockage, and significantly improve patient safety and treatment effects.

[0030] (2) Supporting central venous pressure monitoring: The anti-reverse valve and diversion valve combination structure is set in the extension tube connector of the extension tube at the end of the PICC catheter to prevent blood backflow. At the same time, the anti-reverse valve is opened through the diversion valve, and the central venous pressure can be monitored during normal infusion. It not only meets the needs of routine infusion and blood transfusion, but can also be connected to pressure measuring instruments such as monitors to achieve accurate monitoring of central venous pressure through pressure conduction, providing key hemodynamic data for clinical treatment.

[0031] (3)Improved operational convenience and safety: When the injector is inserted into the liquid inlet, the head of the diversion valve presses into the anti-reflux valve, expanding the liquid control incision and automatically opening the infusion channel; when the injector is withdrawn from the liquid inlet, the elastic deformation of the silicone pad recovers and pushes the diversion valve to reset, causing the head of the diversion valve to push out of the liquid control incision, and the elastic deformation of the anti-reflux valve recovers to automatically close the liquid control incision, thus closing the infusion channel. This design avoids the operational risks of manually closing the infusion channel, is simple and efficient in operation, and can reduce the probability of medical staff's misoperation, thereby effectively preventing blood backflow and further reducing the risks of thrombus formation and catheter blockage.

[0032] (4)Wide applicability: The improved anti-reflux peripherally inserted central venous catheter of the present invention is connected to the PICC catheter through the extension tube joint, extension tube, and connection seat, and is applicable to various intravenous infusion scenarios and multiple clinical scenarios for accurate monitoring of central venous pressure, enhancing the applicability of the central venous catheter, including for general infusion treatment and intensive care needs, and improving the clinical versatility and operational convenience of the central venous catheter.

[0033] (5)Safety guarantee of the catheter clamp: The catheter clamp provided on the extension tube further improves the controllability of the channel, facilitates manually opening or closing the channel of the extension tube in special cases, enhances the safety and flexibility of the overall improved anti-reflux peripherally inserted central venous catheter, and has the emergency performance for handling sudden situations such as blood backflow and anti-reflux valve failure.

[0034] In summary, the present invention realizes the dual functions of anti-reflux and central venous pressure monitoring, effectively improves the performance of the PICC catheter, expands and enhances the applicability of the PICC catheter, and provides a safer, more reliable and efficient solution for clinical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0036] Figure 1 is a top view schematic diagram of the anti-reflux peripherally inserted central venous catheter according to the first embodiment of the present invention;

[0037] Figure 2 is a cross-sectional structural schematic diagram of the extension tube joint according to the first embodiment of the present invention;

[0038] Figure 3 is a front view structural schematic diagram of the anti-reflux valve according to the first embodiment of the present invention;

[0039] Figure 4 isFigure 2 Partial enlarged structural schematic diagram of part A;

[0040] Figure 5 Is the sectional structural schematic diagram of the diversion valve of the first embodiment of the present invention;

[0041] Figure 6 Is the sectional schematic diagram of the extension tube, extension tube joint and injector combination of the first embodiment of the present invention;

[0042] Figure 7 Is the front view structural schematic diagram of the check valve of the second embodiment of the present invention;

[0043] Figure 8 Is the sectional structural schematic diagram of the extension tube joint of the second embodiment of the present invention;

[0044] Figure 9 Is the sectional structural schematic diagram of the extension tube joint of the third embodiment of the present invention;

[0045] Figure 10 Is the sectional schematic diagram of the extension tube joint, resilient rubber ring and guide post of the third embodiment of the present invention.

[0046] Among them, the reference numerals are as follows:

[0047] 00, Anti-reflux flow through the peripheral placement of the central venous catheter;

[0048] 1. Extension tube joint; 11. Upper cover of the joint; 111. Liquid inlet; 112. Vent hole; 12. Lower cover of the joint; 121. Liquid outlet; 122. Rib groove; 123. Rubber ring accommodation groove; 124. Guide through hole; 125. Guide post; 126. Resilient rubber ring; 13. Valve placement cavity; 131. Limit chamfer; 132. Air cavity;

[0049] 2. Check valve; 21. Liquid control notch; 22. Resilient reinforcing rib;

[0050] 3. Diversion valve; 31. Head; 311. Guide taper; 312. Guide fillet; 32. Guide boss; 321. Exhaust groove; 33. Tail; 34. Infusion channel;

[0051] 4. Silicone pad;

[0052] 5. Extension tube;

[0053] 6. Connection seat;

[0054] 7. PICC catheter;

[0055] 8. Catheter clamp;

[0056] 9. Injector. Detailed implementation manners

[0057] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0058] In a specific embodiment, an improved anti-backflow peripherally inserted central venous catheter is provided, including an extension tube joint, an extension tube, a connecting seat and a PICC catheter connected in sequence; a diversion valve, a silicone pad and an anti-backflow valve made of silicone are arranged in sequence in the extension tube joint; an injector is inserted into the liquid inlet and the head of the diversion valve is pushed into the liquid control incision, so that the anti-backflow valve can be opened to form an infusion channel, thereby realizing infusion, blood transfusion and central venous pressure monitoring; when the injector is withdrawn, the silicone pad resets with its own elastic force to push the head of the diversion valve out of the liquid control incision, and the anti-backflow valve automatically closes the liquid control incision with its own elastic force to prevent blood backflow; it can effectively prevent blood backflow and reduce the risk of thrombosis in the infusion channel. At the same time, the central venous pressure monitoring is supported by connecting the pressure measuring instrument through the diversion valve, thereby improving the applicability and safety of the central venous catheter; it effectively solves the technical problem of the existing central venous catheter that it cannot take into account both blood backflow protection and central venous pressure monitoring at the same time.

[0059] The first implementation of an improved anti-reflux peripherally inserted central catheter Figures 1 to 6 As shown, it includes an extension pipe joint 1, and both ends of the extension pipe joint 1 are provided with a liquid inlet 111 and a liquid outlet 121; the liquid inlet 111 is used to connect the injector 9 to be connected; a valve cavity 13 is provided in the extension pipe joint 1, and a guide valve 3, a silicone pad 4 and an anti-return valve 2 made of silicone are installed in sequence in the valve cavity 13 along the direction of the inflowing liquid; wherein, a liquid control cutout 21 is provided on the anti-return valve 2, and the shape of the liquid control cutout 21 is a straight line; the anti-return valve 2 is adjacent to the liquid outlet 121, and the guide valve 3 is adjacent to the liquid inlet 111; the head 31 of the guide valve 3 faces the surface of the anti-return valve 2 away from the liquid outlet 121, and the outer diameter of the head 31 of the guide valve 3 is smaller than the length of the liquid control cutout 21; the injector 9 is inserted into the liquid inlet 111, and pushes the guide valve The head 31 of 3 is pushed into the anti-return valve 2 to open the liquid control incision 21 of the anti-return valve 2, and at the same time, the injector 9 is connected with the tail 33 of the diverter valve 3 to form an infusion channel 34 for infusion or blood transfusion and central venous pressure detection; the injector 9 withdraws from the liquid inlet 111, the thrust of the diverter valve 3 disappears, the silicone pad 4 restores its elastic deformation to push the head 31 of the diverter valve 3 to withdraw from the liquid control incision 21, the elastic deformation of the anti-return valve 2 is restored to close the liquid control incision 21, and the infusion channel 34 is closed; and the extension tube 5, the connecting seat 6 and the PICC catheter 7 are connected in sequence, the extension tube 5 is connected with the liquid outlet 121 of the extension tube joint 1; and the catheter clamp 8, the catheter clamp 8 is arranged on the extension tube 5, and the catheter clamp 8 is used to cut off or open the channel of the extension tube 5.

[0060] Among them, the extension pipe joint 1 is composed of an upper joint cover 11 and a lower joint cover 12. The liquid inlet 111 is on the upper joint cover 11, and the liquid outlet 121 is on the lower joint cover 12.

[0061] Specifically, the above-mentioned injector 9 includes a syringe or an infusion device and a connector for a monitoring and pressure measuring instrument, and is used for infusion or blood transfusion treatment and central venous pressure detection.

[0062] When in use, when the injector 9 is inserted into the liquid inlet 111, the head 31 of the injector 9 is connected to the tail 33 of the flow guiding valve 3 and pushes the flow guiding valve 3, so that the head 31 of the flow guiding valve 3 is pushed into the anti-reflux valve 2. The liquid control notch 21 of the anti-reflux valve 2 is opened following the entry of the flow guiding valve 3. At the same time, the injector 9 is communicated with the tail 33 of the flow guiding valve 3 to form an infusion channel 34. The formation of the infusion channel 34 is used for infusion or blood transfusion, and is communicated with a pressure measuring instrument such as a monitor, so as to realize the monitoring of the central venous pressure.

[0063] At the moment when the injector 9 is disconnected from the extension pipe joint 1, the injector 9 withdraws from the liquid inlet 111, the thrust of the flow guiding valve 3 disappears, and the silica gel pad 4 restores its deformation and pushes the flow guiding valve 3 towards the liquid inlet 111 with its own elastic force. The head 31 of the flow guiding valve 3 withdraws from the liquid control notch 21, and the anti-reflux valve 2 restores its deformation and closes the liquid control notch 21 following the withdrawal of the head 31 of the flow guiding valve 3 with its own elastic force, thereby closing the infusion channel 34 to prevent blood backflow.

[0064] By arranging an anti-reflux valve 2 with a linear liquid control notch 21 in the extension pipe joint 1, combined with the elastic deformation and its own elastic force of the silica gel pad 4, the automatic closing function of the infusion channel 34 is realized; when the liquid inlet 111 of the extension pipe joint 1 is not inserted into the injector 9, the anti-reflux valve 2 made of silica gel relies on its own elastic force and self-sealing property to tightly close the liquid control notch 21, which can effectively prevent blood backflow, reduce the risk of thrombus formation and catheter blockage, and significantly improve the safety and treatment effect of patients.

[0065] Through the combined structure of the anti-reflux valve 2 and the flow guiding valve 3, which is arranged in the extension pipe joint 1 of the extension pipe 5 at the end of the PICC catheter 7, blood backflow can be prevented; at the same time, by opening the anti-reflux valve 2 through the flow guiding valve 3, the central venous pressure can be monitored while normal infusion is carried out. It not only meets the requirements of conventional infusion and blood transfusion, but also can be connected to a pressure measuring instrument such as a monitor, and through pressure conduction, the accurate monitoring of the central venous pressure can be realized, providing key hemodynamic data for clinical treatment.

[0066] When the injector 9 is inserted into the liquid inlet 111, the head 31 of the diverter valve 3 pushes into the anti-return valve 2, stretches the liquid control incision 21, and automatically opens the infusion channel 34; when the injector 9 withdraws from the liquid inlet 111, the elastic deformation of the silicone pad 4 recovers and pushes the diverter valve 3 to reset, so that the head 31 of the diverter valve 3 is pushed out of the liquid control incision 21, and the elastic deformation of the anti-return valve 2 is recovered to automatically close the liquid control incision 21, thereby closing the infusion channel 34; this design avoids the operational risk of manually closing the infusion channel 34, is simple and efficient to operate, and can reduce the probability of misoperation by medical personnel, thereby effectively preventing blood backflow and further reducing the risk of thrombosis and tube blockage.

[0067] The improved anti-backflow peripherally inserted central venous catheter 00 of the present invention has a structure connected to the PICC catheter 7 through an extension tube connector 1, an extension tube 5, and a connecting seat 6. It is suitable for various intravenous infusion scenarios and a variety of clinical scenarios for accurate monitoring of central venous pressure, and enhances the applicability of central venous catheters, including for general infusion therapy and intensive care needs, improves the clinical versatility and operational convenience of central venous catheters, thereby expanding the applicability of central venous catheters.

[0068] As an optional implementation method

[0069] Regarding the specific structure of the valve cavity 13 of the extension pipe joint 1, this embodiment is as follows: Figure 2 and Figure 6 As shown, the valve cavity 13 is provided with a limiting chamfer 131 at one end adjacent to the liquid outlet 121, which is used to limit the opening angle of the anti-return valve 2 and increase the number of cycles of opening and closing the anti-return valve 2.

[0070] When in use, the setting of the limit chamfer 131 prevents the liquid control cutout 21 of the anti-return valve 2 from being excessively squeezed by the head 31 of the guide valve 3, causing the silicone material of the anti-return valve 2 to be excessively flexed and stretched and exceed its elastic range, thereby improving the durability of the anti-return valve 2.

[0071] Regarding the specific structure of the diverter valve 3, this embodiment Figure 2 , Figure 5 and Figure 6 As shown, the guide valve 3 is provided with a guide boss 32 between the head 31 and the tail 33; the two end surfaces of the silicone pad 4 are respectively abutted against the guide boss 32 and the anti-return valve 2; the surface of the guide boss 32 facing the liquid inlet 111 is abutted against the inner end surface of the valve cavity 13 adjacent to the liquid inlet 111 in a detachable manner; the circumferential curved surface of the guide boss 32 is slidably connected to the inner wall surface of the valve cavity 13 to form a seal.

[0072] Further, such as Figure 5 As shown, the head 31 of the guide valve 3 is provided with a guide taper 311 .

[0073] During application, when the diversion valve 3 advances or retracts from the check valve 2, the guiding taper 311 is used to gradually open or close the liquid control notch 21.

[0074] Furthermore, as Figure 5 shown, a guiding fillet 312 is provided at the end of the head 31 of the diversion valve 3; the guiding fillet 312 is used to guide the head 31 of the diversion valve 3 to enter the liquid control notch 21 in a smooth contact.

[0075] During application, when the head 31 of the diversion valve 3 is inserted into the liquid control notch 21, it is to avoid the sharp corner at the end of the head 31 of the diversion valve 3 from piercing the valve body of the check valve 2, resulting in a reduction in the self-sealing property of the liquid control notch 21 of the check valve 2. At the same time, it guides the axis of the diversion valve 3 to coincide with the axis of the liquid control notch 21 moderately, maintaining automatic centering, so that the liquid control notch 21 opens evenly, avoiding uneven local stress and resulting in inconsistent deformation, and reducing the self-sealing property of the check valve 2.

[0076] To avoid the problem that the sealing performance of the check valve 2 is reduced due to trapped air in the valve chamber 13 when the diversion valve 3 advances or retracts from the liquid control notch 21 of the check valve 2, in this embodiment, as Figure 2 、 Figure 4 、 Figure 5 and Figure 6 shown, the tail 33 of the diversion valve 3 extends into the liquid inlet 111, and the circumferential surface of the tail 33 of the diversion valve 3 forms a seal with the junction of the valve chamber 13 and the liquid inlet 111; an exhaust hole 112 is provided on the extended pipe joint 1, and the exhaust hole 112 is communicated with the valve chamber 13 to discharge the gas in the valve chamber 13 when the diversion valve 3 retracts from the liquid control notch 21.

[0077] During the process of the head 31 of the diversion valve 3 being inserted into the liquid control notch 21, the surface of the guiding boss 32 facing the liquid inlet 111 is separated from the inner end surface of the valve chamber 13 adjacent to the liquid inlet 111 to form an air chamber 132. External gas enters the air chamber 132 through the exhaust hole 112 to form normal pressure, which is used to reduce the resistance of the compression silica gel pad 4; during the process of the diversion valve 3 retracting from the liquid control notch 21, the gas in the air chamber 132 is discharged to the outside of the extended pipe joint 1 through the exhaust hole 112, which is used to reduce the resistance of the silica gel pad 4 to rebound.

[0078] During application, the exhaust hole 112 is used to avoid the weakening of the rebound of the silica gel pad 4 due to trapped air in the valve chamber 13 of the diversion valve 3, resulting in a delayed rebound of the check valve 2, a delayed closing of the liquid control notch 21, and preventing liquid backflow.

[0079] Regarding the specific structure of the cooperation between the above-mentioned diversion valve 3 and the exhaust hole 112, in this embodiment, as Figure 2 、 Figure 4 、 Figure 5 and Figure 6As shown, an exhaust groove 321 is provided on the circumferential curved surface of the guiding boss 32. One side of the exhaust groove 321 is flush with the surface of the guiding boss 32 facing the liquid inlet 111, and the width of the exhaust groove 321 is less than or equal to the diameter of the exhaust hole 112. The exhaust groove 321 is used to provide an initial space in the valve chamber 13 for the intake or exhaust of the exhaust hole 112.

[0080] During application, when the surface of the guiding boss 32 facing the liquid inlet 111 abuts against the inner end surface of the valve chamber 13 adjacent to the liquid inlet 111, the diversion valve 3 is in the initial position within the valve chamber 13, and the exhaust groove 321 is within the coverage range of the exhaust hole 112, providing an initial space in the valve chamber 13 for the intake or exhaust of the exhaust hole 112 to prevent the circumferential curved surface of the guiding boss 32 from blocking the exhaust hole 112.

[0081] The second embodiment of the improved anti-reflux peripherally inserted central venous catheter is as Figure 7 and Figure 8 As shown, the difference between this embodiment and the first embodiment is that a rebound reinforcing rib 22 is provided on the surface of the anti-reflux valve 2 facing the liquid outlet 121. The rebound reinforcing rib 22 is used to accelerate the closing of the liquid control notch 21. A rib groove 122 corresponding to the position and shape of the rebound reinforcing rib 22 is provided in the extension tube joint 1. The rib groove 122 is arranged along the straightening and bending path of the rebound reinforcing rib 22 and is used to accommodate the rebound reinforcing rib 22 when the anti-reflux valve 2 is closed or opened.

[0082] During application, on the one hand, the rebound reinforcing rib 22 can improve the thrust of the anti-reflux valve 2 receiving the diversion valve 3. On the other hand, after the liquid control notch 21 of the anti-reflux valve 2 is opened, the rebound reinforcing rib 22 can not only improve the resilience of the body of the anti-reflux valve 2 itself, but also without increasing the overall thickness of the body of the anti-reflux valve 2, so that the deformation recovery speed of the liquid control notch 21 of the anti-reflux valve 2 is accelerated, thereby reducing the closing time of the liquid control notch 21 and further reducing the idle time when the liquid control notch 21 is closed.

[0083] The third embodiment of the improved anti-reflux peripherally inserted central venous catheter is as Figure 9 and Figure 10As shown, the difference between this embodiment and the first embodiment lies in that a rubber ring accommodating groove 123 is provided on the outer peripheral curved surface of the extension pipe joint 1, and the rubber ring accommodating groove 123 is provided adjacent to the surface of the anti-return valve 2 facing the liquid outlet 121; a guide through hole 124 is provided in the tube wall of the extension tube 5, and the axis of the guide through hole 124 is inclined toward the rebound reinforcement rib 22; the two ends of the guide through hole 124 are connected to the rubber ring accommodating groove 123 and the rib groove 122; a guide column 125 is slidably installed in the guide through hole 124, and the guide column 125 is sealed and abutted with the hole wall of the guide through hole 124; a rebound rubber ring 126 is installed in the rubber ring accommodating groove 123; the two ends of the guide column 125 are respectively abutted with the rebound reinforcement rib 22 and the rebound rubber ring 126, and the elastic force of the rebound rubber ring 126 drives the guide column 125 to push the rebound reinforcement rib 22 to accelerate the closing of the liquid control incision 21.

[0084] During application, when the liquid control incision 21 is opened, the rebound reinforcement rib 22 pushes the guide column 125 to extend outward, and the rebound rubber ring 126 is expanded and stored by the guide column 125; when the liquid control incision 21 is closed, the rebound rubber ring 126 shrinks into the rubber ring accommodating groove 123 and pushes the guide column 125, and the guide column 125 pushes the rebound reinforcement rib 22 to accelerate the closing of the liquid control incision 21, thereby further reducing the closing time of the liquid control incision 21 and reducing the idle time of the liquid control incision 21 when closing.

[0085] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described.

Claims

1. An improved anti-backflow peripherally inserted central venous catheter, characterized in that: It comprises an extension pipe joint, and both ends of the extension pipe joint are provided with a liquid inlet and a liquid outlet; the liquid inlet is used to connect the injector to be connected; a valve cavity is provided in the extension pipe joint, and a guide valve, a silicone pad and an anti-reverse valve made of silicone are installed in sequence in the valve cavity along the direction of the inflowing liquid; The anti-return valve is provided with a liquid control cutout, and the shape of the liquid control cutout is a straight line; the head of the diverter valve faces the surface of the anti-return valve away from the liquid outlet, and the outer diameter of the head of the diverter valve is smaller than the length of the liquid control cutout; The injector is inserted into the liquid inlet, and pushes the head of the diversion valve into the anti-return valve to open the liquid control incision of the anti-return valve. At the same time, the injector is connected with the tail of the diversion valve to form an infusion channel for infusion or blood transfusion and detection of central venous pressure. The injector exits the liquid inlet, the thrust of the diverter valve disappears, the silicone pad recovers its elastic deformation to push the head of the diverter valve out of the liquid control incision, and the anti-return valve recovers its elastic deformation to close the liquid control incision, thereby closing the infusion channel; The flow guide valve is provided with a guide boss between the head and the tail; the two end surfaces of the silicone pad are respectively in contact with the guide boss and the anti-return valve; the surface of the guide boss facing the liquid inlet is in contact with the inner end surface of the valve cavity adjacent to the liquid inlet in a detachable manner; the circumferential curved surface of the guide boss is slidably connected with the inner wall surface of the valve cavity to form a seal; The tail of the diverter valve is extended into the liquid inlet, and the circumferential curved surface of the tail of the diverter valve forms a seal with the junction of the valve cavity and the liquid inlet; the extension pipe joint is provided with an exhaust hole, which is communicated with the valve cavity, and the gas in the valve cavity is exhausted when the diverter valve exits the liquid control incision; When the head of the guide valve is pushed into the liquid control incision, the surface of the guide boss facing the liquid inlet is separated from the inner end surface of the valve cavity adjacent to the liquid inlet to form an air cavity, and external gas enters the air cavity through the exhaust hole to form a normal pressure, which is used to reduce the resistance of compressing the silicone pad; when the guide valve is withdrawn from the liquid control incision, the gas in the air cavity is discharged to the outside of the extension pipe joint through the exhaust hole, which is used to reduce the resistance of the silicone pad to rebound; An exhaust groove is provided on the circumferential curved surface of the guide boss, one side of the exhaust groove is flush with the surface of the guide boss facing the liquid inlet, and the width of the exhaust groove is less than or equal to the diameter of the exhaust hole; the exhaust groove is used to provide an initial space in the valve cavity for the intake or exhaust of the exhaust hole; A rebound reinforcement rib is provided on the surface of the anti-return valve facing the liquid outlet, and the rebound reinforcement rib is used to accelerate the closing of the liquid control cutout; a rib groove corresponding to the position and shape of the rebound reinforcement rib is provided in the extension pipe joint, and the rib groove is arranged along the straightening and bending path of the rebound reinforcement rib, and is used to accommodate the rebound reinforcement rib when the anti-return valve is closed or opened; and an extension tube, a connection seat and a PICC catheter which are connected in sequence, wherein the extension tube is connected to a liquid outlet of the extension tube joint; And a catheter clamp, which is arranged on the extension tube and is used to cut off or open the channel of the extension tube.

2. The improved anti-reflux peripherally inserted central venous catheter according to claim 1, characterized in that: The valve cavity is provided with a limiting chamfer at one end adjacent to the liquid outlet, which is used to limit the opening angle of the anti-return valve and increase the number of cycles of opening and closing the anti-return valve.

3. The improved anti-reflux peripherally inserted central venous catheter according to claim 1, characterized in that: The head of the diverter valve is provided with a guide taper; the guide taper is used to gradually open or close the liquid control incision.

4. The improved anti-reflux peripherally inserted central venous catheter according to claim 3, characterized in that: A guide fillet is provided at the end of the head of the diverter valve; the guide fillet is used to guide the head of the diverter valve to enter the liquid control incision with smooth contact.

5. The improved anti-reflux peripherally inserted central venous catheter according to claim 1, characterized in that: A rubber ring receiving groove is provided on the outer peripheral curved surface of the extension pipe joint, and the rubber ring receiving groove is provided adjacent to the surface of the anti-reverse valve facing the liquid outlet; A guide through hole is provided in the tube wall of the extension tube, the axis of the guide through hole is inclined toward the rebound reinforcement rib; two ends of the guide through hole are connected to the rubber ring accommodating groove and the rib groove; A guide post is slidably installed in the guide through hole, and the guide post is in sealing contact with the hole wall of the guide through hole; a rebound rubber ring is installed in the rubber ring receiving groove; The two ends of the guide column are respectively in contact with the rebound reinforcement rib and the rebound rubber ring, and the elastic force of the rebound rubber ring drives the guide column to push the rebound reinforcement rib to accelerate the closing of the liquid control incision.

Images