Improved anti-reflux peripherally inserted central venous catheter

Abstract

The invention discloses an improved anti-reflux peripherally inserted central catheter, which relates to the technical field of medical instruments and comprises an extension tube joint, an extension tube, a connecting seat and a PICC (peripherally inserted central catheter) which are communicated in sequence, a diverter valve, a silica gel pad and a check valve made of silica gel are sequentially arranged in the extension pipe joint; the injector is inserted into the liquid inlet and pushes the head of the flow guide valve to enter the liquid control notch, the check valve can be opened to form an infusion channel, and infusion, blood transfusion and central venous pressure monitoring are achieved. When the injector withdraws, the silica gel pad resets by self-elasticity to push the head of the diverter valve to withdraw from the liquid control cut, and the check valve automatically closes the liquid control cut by self-elasticity to prevent blood from flowing back; blood backflow can be effectively prevented, the thrombus risk of an infusion channel is reduced, meanwhile, the flow guide valve is connected into a pressure measuring instrument to support central venous pressure monitoring, and the applicability and safety of the central venous catheter are improved; the problem that an existing central venous catheter cannot achieve blood countercurrent protection and central venous pressure monitoring at the same time is solved.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a peripherally inserted central venous catheter for preventing backflow. Background Art

[0002] Peripherally Inserted Central Catheter (PICC) is a commonly used intravenous infusion tool, widely used in clinical mid- to long-term intravenous infusion therapy. The PICC catheter is inserted through peripheral venous puncture, and the catheter tip is positioned in the superior vena cava, providing patients with a safe, stable, and reusable infusion route. However, the two common types of central venous catheters are front-end valve type and front-end opening type, but both types of central venous catheters have their own shortcomings and cannot fully meet the clinical needs of patients. An improved anti-reflux central venous catheter is urgently needed to optimize performance.

[0003] Limitations of existing central venous catheters: (1) A one-way valve is set at the tip of the front valve catheter, which can effectively prevent blood backflow and reduce the risk of thrombosis and tube blockage. However, this design requires a certain amount of pressure to open the valve, leading to the following problems: 1.1. Unable to monitor central venous pressure (CVP): The valve blocks direct pressure transmission with the central vein, and the central venous pressure cannot be detected, making the front-end valve catheter unable to be used to evaluate the patient's hemodynamic condition.

[0004] 1.2. Limitation of use: This catheter cannot meet the needs of patients who require accurate central venous pressure monitoring (such as intensive care patients).

[0005] (2) The front-end open-end catheter is directly open at the tip of the catheter, which can accurately monitor central venous pressure, but its open design also brings the following risks: 2.1. Risk of blood backflow and thrombosis: Since there is no backflow protection mechanism, changes in the patient's body position or catheter operation may cause blood to flow back into the catheter lumen, increasing the risk of thrombosis.

[0006] 2.2. Tube blockage problem: Once a blood clot is formed, it may cause catheter blockage, affecting the continuity and safety of treatment, and even requiring catheter removal and reinsertion.

[0007] The existing central venous catheter structure and performance have certain functional advantages in different aspects, but they all have limitations. They cannot take into account both blood backflow protection and central venous pressure monitoring functions at the same time. There are technical gaps and they cannot fully meet the clinical needs of patients.

[0008] Therefore, there is a need for technical improvements in central venous catheters, which can not only make up for the shortcomings of existing technologies, but also significantly improve the safety, effectiveness and patient experience of clinical treatment.

[0009] In summary, it is found that the prior art has at least the following technical problems: Existing central venous catheters have the technical problem of being unable to simultaneously take into account blood backflow protection and central venous pressure monitoring. Summary of the invention

[0010] The purpose of the present invention is to provide an improved anti-backflow peripherally inserted central venous catheter to solve the technical problem that the existing central venous catheter cannot take into account both blood backflow protection and central venous pressure monitoring at the same time.

[0011] The various technical effects that can be produced by the preferred technical solutions among the various technical solutions provided by the present invention are described in detail below.

[0012] In order to solve the above technical problems, the present invention provides the following technical solutions: The present invention provides an improved anti-reverse flow peripherally inserted central venous catheter, comprising an extension pipe joint, wherein 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; wherein a liquid control incision is provided on the anti-reverse valve, and the shape of the liquid control incision is a straight line; the head of the guide valve faces the surface of the anti-reverse valve away from the liquid outlet, and the outer peripheral diameter of the head of the guide valve is smaller than the length of the liquid control incision; the injector is inserted into the liquid inlet, and the head of the guide valve is pushed into the The anti-return valve has a liquid control incision for opening the anti-return valve, and at the same time, the injector is connected to the tail of the diversion valve to form an infusion channel for infusion or blood transfusion and central venous pressure detection; the injector withdraws from the liquid inlet, the thrust of the diversion valve disappears, the silicone pad restores its elastic deformation to push the head of the diversion valve to withdraw from the liquid control incision, and the elastic deformation of the anti-return valve is restored to close the liquid control incision and the infusion channel; and an extension tube, a connecting seat and a PICC catheter connected in sequence, the extension tube is connected to the liquid outlet of the extension tube joint; 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.

[0013] In one of the embodiments, the valve cavity is provided with a limiting chamfer at one end adjacent to the liquid outlet, so as to limit the opening angle of the anti-return valve and increase the number of cycles of opening and closing the anti-return valve.

[0014] In one of the embodiments, the guide valve is provided with a guide boss between the head and the tail; the two end surfaces of the silicone pad are respectively abutted against the guide boss and the anti-return valve; the surface of the guide boss facing the liquid inlet is abutted against 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 to the inner wall surface of the valve cavity to form a seal.

[0015] In one of the embodiments, the tail of the guide valve is extended into the liquid inlet, and the circumferential curved surface of the tail of the guide valve forms a seal with the junction of the valve cavity and the liquid inlet; an exhaust hole is provided on the extension pipe joint, and the exhaust hole is connected with the valve cavity to discharge the gas in the valve cavity when the guide valve exits the liquid control incision.

[0016] In one of the embodiments, 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 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.

[0017] In one of the embodiments, 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 air intake or exhaust of the exhaust hole.

[0018] In one of the embodiments, 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.

[0019] In one of the embodiments, 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.

[0020] In one of the embodiments, 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 incision; 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, so as to accommodate the rebound reinforcement rib when the anti-return valve is closed or opened.

[0021] 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.

[0022] The beneficial effects of the present invention are as follows: 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: (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.

[0023] (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.

[0024] (3) Convenient operation and improved safety: When the injector is inserted into the liquid inlet, the head of the diversion valve pushes into the anti-return valve, stretches the liquid control incision, and automatically opens 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, so that the head of the diversion valve is pushed out of the liquid control incision, and the elastic deformation of the anti-return valve recovers to automatically close the liquid control incision, thereby closing the infusion channel; this design avoids the operational risks of manually closing the infusion channel, is simple and efficient to operate, and can reduce the probability of misoperation by medical staff, thereby effectively preventing blood backflow and further reducing the risk of thrombosis and tube blockage.

[0025] (4) Wide applicability: The improved anti-backflow peripherally inserted central catheter of the present invention is connected to the PICC catheter through an extension tube connector, an extension tube, and a connecting seat. It is suitable for various intravenous infusion scenarios and a variety of clinical scenarios for accurate monitoring of central venous pressure, which enhances the applicability of central venous catheters, including for general infusion therapy and intensive care needs, and improves the clinical versatility and ease of operation of central venous catheters.

[0026] (5) Safety guarantee of catheter clamp: The catheter clamp installed on the extension tube further improves the controllability of the channel, making it convenient to manually open or close the channel of the extension tube under special circumstances, enhancing the safety and flexibility of the overall improved anti-reflux peripherally inserted central venous catheter, and has emergency performance to deal with sudden situations such as blood reflux and anti-reflux valve failure.

[0027] In summary, the present invention realizes the dual functions of anti-backflow and central venous pressure monitoring, effectively improves the performance of PICC catheters, expands and enhances the applicability of PICC catheters, and provides a safer, more reliable and efficient solution for clinical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 is a top view schematic diagram of a peripherally inserted central venous catheter for preventing backflow according to a first embodiment of the present invention; Figure 2 is a schematic cross-sectional view of the extension pipe joint according to the first embodiment of the present invention; Figure 3 1 is a front view structural diagram of the anti-reverse valve according to the first embodiment of the present invention; Figure 4 yes Figure 2 A schematic diagram of the partially enlarged structure of part A; Figure 5 is a schematic cross-sectional structural diagram of a diverter valve according to a first embodiment of the present invention; Figure 6 is a cross-sectional schematic diagram of a combination of an extension pipe, an extension pipe joint and an injector according to a first embodiment of the present invention; Figure 7 1 is a front view structural diagram of an anti-reverse valve according to a second embodiment of the present invention; Figure 8 is a schematic cross-sectional view of an extension pipe joint according to a second embodiment of the present invention; Fig. 9 is a schematic cross-sectional view of an extension pipe joint according to a third embodiment of the present invention; Fig.10 It is a cross-sectional schematic diagram of an extended pipe joint, a rebound rubber ring and a guide column according to a third embodiment of the present invention.

[0030] The reference numerals are as follows: 00. Anti-reflux peripherally inserted central venous catheter; 1. Extension pipe joint; 11. Joint upper cover; 111. Liquid inlet; 112. Exhaust hole; 12. Joint lower cover; 121. Liquid outlet; 122. Rib groove; 123. Rubber ring receiving groove; 124. Guide through hole; 125. Guide column; 126. Rebound rubber ring; 13. Valve cavity; 131. Limit chamfer; 132. Air cavity; 2. Anti-reverse valve; 21. Liquid control cutout; 22. Rebound reinforcement rib; 3. diversion valve; 31. head; 311. guide taper; 312. guide fillet; 32. guide boss; 321. exhaust groove; 33. tail; 34. infusion channel; 4. Silicone pad; 5. Extension tube; 6. Connecting seat; 7. PICC catheter; 8. Catheter clamp; 9. Injector. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] The extension pipe joint 1 comprises a joint upper cover 11 and a joint lower cover 12 , wherein the liquid inlet 111 is located on the joint upper cover 11 , and the liquid outlet 121 is located on the joint lower cover 12 .

[0035] Specifically, the injector 9 includes a syringe or an infusion set and a connector for monitoring and pressure measuring instruments, and is used for infusion or blood transfusion therapy and central venous pressure detection.

[0036] During 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 diverter valve 3 and pushes the diverter valve 3, so that the head 31 of the diverter valve 3 is pushed into the anti-return valve 2, and the liquid control incision 21 of the anti-return valve 2 opens with the entry of the diverter valve 3. At the same time, the injector 9 is connected to the tail 33 of the diverter valve 3 to form an infusion channel 34. The infusion channel 34 is formed for infusion or blood transfusion, and is connected to pressure measuring instruments such as a monitor, thereby monitoring the central venous pressure.

[0037] 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 diverter valve 3 disappears, the silicone pad 4 recovers its deformation and pushes the diverter valve 3 toward the liquid inlet 111 with its own elastic force, the head 31 of the diverter valve 3 withdraws from the liquid control incision 21, and the anti-return valve 2 recovers its deformation and closes the liquid control incision 21 with its own elastic force as the head 31 of the diverter valve 3 withdraws, thereby closing the infusion channel 34 to prevent blood reflux.

[0038] By arranging an anti-return valve 2 with a straight-line liquid control incision 21 in the extension pipe joint 1, combined with the elastic deformation of the silicone pad 4 and its own elastic force, the automatic closing function of the infusion channel 34 is achieved; when the liquid inlet 111 of the extension pipe joint 1 is not inserted into the injector 9, the anti-return valve 2 made of silicone relies on its own elastic force and self-tightness to tightly close the liquid control incision 21, which can effectively prevent blood backflow, reduce the risk of thrombosis and tube blockage, and significantly improve the patient's safety and treatment effect.

[0039] Through the combined structure of the anti-reverse valve 2 and the diversion valve 3, which is arranged in the extension tube joint 1 of the extension tube 5 at the end of the PICC catheter 7, blood backflow can be prevented; at the same time, the anti-reverse valve 2 is opened through the diversion valve 3, and the central venous pressure can be monitored during normal infusion, which not only meets the needs of conventional infusion and blood transfusion, but also can be connected to pressure measuring instruments such as monitors, and accurate monitoring of central venous pressure can be achieved through pressure conduction, providing key hemodynamic data for clinical treatment.

[0040] 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.

[0041] 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.

[0042] As one of the optional implementations 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.

[0043] 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.

[0044] 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.

[0045] Further, such as Figure 5 As shown, the head 31 of the guide valve 3 is provided with a guide taper 311 .

[0046] During application, when the guide valve 3 is pushed forward or withdrawn toward the anti-return valve 2, the guide taper 311 is used to gradually open or close the liquid control cutout 21.

[0047] Furthermore, Figure 5 As shown, a guide fillet 312 is provided at the end of the head 31 of the diverter valve 3 ; the guide fillet 312 is used to guide the head 31 of the diverter valve 3 to enter the liquid control cutout 21 with smooth contact.

[0048] During use, when the head 31 of the diverter valve 3 is pushed into the liquid control cutout 21, the sharp corners at the end of the head 31 of the diverter valve 3 are prevented from piercing the valve body of the anti-return valve 2, which would reduce the self-tightness of the liquid control cutout 21 of the anti-return valve 2. At the same time, the axis of the diverter valve 3 is guided to coincide with the axis of the liquid control cutout 21 to maintain automatic centering, so that the liquid control cutout 21 opens evenly, avoiding uneven deformation due to local uneven force, and reducing the self-tightness of the anti-return valve 2.

[0049] In order to avoid the problem that the sealing performance of the anti-return valve 2 is reduced due to trapped air in the valve cavity 13 when the guide valve 3 is pushed into or out of the control cutout 21 of the anti-return valve 2, this embodiment Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, the tail portion 33 of the guide valve 3 is extended into the liquid inlet 111, and the circumferential curved surface of the tail portion 33 of the guide valve 3 forms a seal with the junction of the valve cavity 13 and the liquid inlet 111; an exhaust hole 112 is provided on the extension pipe joint 1, and the exhaust hole 112 is connected to the valve cavity 13, and the gas in the valve cavity 13 is discharged when the guide valve 3 exits the liquid control incision 21.

[0050] When the head 31 of the guide valve 3 is pushed into the liquid control incision 21, the surface of the guide boss 32 facing the liquid inlet 111 is separated from the inner end surface of the valve cavity 13 adjacent to the liquid inlet 111 to form an air cavity 132, and external gas enters the air cavity 132 through the exhaust hole 112 to form normal pressure, which is used to reduce the resistance of the compressed silicone pad 4; when the guide valve 3 is withdrawn from the liquid control incision 21, the gas in the air cavity 132 is discharged to the outside of the extension pipe joint 1 through the exhaust hole 112, which is used to reduce the resistance of the silicone pad 4 to rebound.

[0051] During application, the exhaust hole 112 is used to prevent the guide valve 3 from being trapped in the valve cavity 13, thereby weakening the rebound of the silicone pad 4, causing the anti-return valve 2 to rebound in time, and causing the liquid control incision 21 to close in time, thereby preventing liquid reflux.

[0052] Regarding the specific structure of the above-mentioned guide valve 3 and the exhaust hole 112, this embodiment is as follows: Figure 2 , Figure 4 , Figure 5 and Figure 6As shown, an exhaust groove 321 is provided on the circumferential curved surface of the guide boss 32, one side of the exhaust groove 321 is flush with the surface of the guide 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 cavity 13 for the intake or exhaust of the exhaust hole 112.

[0053] During application, when the surface of the guide boss 32 facing the liquid inlet 111 abuts against the inner end surface of the valve cavity 13 adjacent to the liquid inlet 111, the guide valve 3 is located at the initial position in the valve cavity 13, and the exhaust groove 321 is within the coverage range of the exhaust hole 112, providing an initial space in the valve cavity 13 for the intake or exhaust of the exhaust hole 112, so as to prevent the circumferential curved surface of the guide boss 32 from blocking the exhaust hole 112.

[0054] A second embodiment of an improved anti-reflux peripherally inserted central catheter Figure 7 and Figure 8 As shown, the difference between this embodiment and the first embodiment is that a rebound reinforcement rib 22 is provided on the surface of the anti-return valve 2 facing the liquid outlet 121, and the rebound reinforcement rib 22 is used to accelerate the closing of the liquid control incision 21; a rib groove 122 corresponding to the position and shape of the rebound reinforcement rib 22 is provided in the extension pipe joint 1, and the rib groove 122 is arranged along the straightening and bending path of the rebound reinforcement rib 22, and is used to accommodate the rebound reinforcement rib 22 when the anti-return valve 2 is closed or opened.

[0055] When in use, the rebound reinforcement rib 22 can, on the one hand, increase the thrust of the guide valve 3 received by the anti-return valve 2, and on the other hand, after the liquid control incision 21 of the anti-return valve 2 is opened, the rebound reinforcement rib 22 can not only increase the rebound force of the valve body of the anti-return valve 2 itself, but also do not need to increase the overall thickness of the valve body of the anti-return valve 2, so that the deformation recovery speed of the liquid control incision 21 of the anti-return valve 2 is accelerated, thereby reducing the closing time of the liquid control incision 21, and further reducing the idle time of the liquid control incision 21 when closing.

[0056] A third embodiment of the improved anti-reflux peripherally inserted central catheter is Fig. 9 and Fig.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.

[0057] 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.

[0058] 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; 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 guide valve is provided with a guide boss between the head and the tail; the two end surfaces of the silicone pad are respectively abutted against the guide boss and the anti-return valve; the surface of the guide boss facing the liquid inlet is abutted against 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 to the inner wall surface of the valve cavity to form a seal.

4. The improved anti-reflux peripherally inserted central venous catheter according to claim 3, characterized in that: The tail of the diverter valve extends 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 guide valve exits the liquid control incision.

5. The improved anti-reflux peripherally inserted central venous catheter according to claim 4, characterized in that: When the head of the guide valve is pushed into the liquid control cutout, 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 cutout, the gas in the air cavity is discharged to the outside of the extension pipe joint through the exhaust hole, so as to reduce the resistance of the silicone pad to rebound.

6. The improved anti-reflux peripherally inserted central venous catheter according to claim 5, characterized in that: An exhaust groove is arranged 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 air intake or exhaust of the exhaust hole.

7. 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.

8. The improved anti-reflux peripherally inserted central venous catheter according to claim 7, 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.

9. The improved anti-reflux peripherally inserted central venous catheter according to claim 1, characterized in that: 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 incision; A rib groove corresponding to the position and shape of the rebound reinforcement rib is arranged in the extension pipe joint. The rib groove is arranged along the straightening and bending path of the rebound reinforcement rib to accommodate the rebound reinforcement rib when the anti-return valve is closed or opened.

10. The improved anti-reflux peripherally inserted central venous catheter according to claim 9, 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.

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