An indwelling catheter with a valve core

Abstract

This invention relates to the field of medical device technology, specifically to an indwelling catheter with a valve core. The catheter includes a catheter, a catheter seat, an extension tube, and an infusion interface assembly connected to form a medication channel within the indwelling catheter. A valve core is installed within the channel, with its head fitted to and sealing the inner diameter of the catheter outlet. The valve core is placed in the extension tube of the medication channel, and a driving device pushes or pulls the valve core along the medication channel and guide channel. This invention innovatively applies different driving methods to drive the valve core within the channel, achieving the purpose of closing and opening the medication channel from within, preventing blood backflow into the catheter from the source, completely eliminating the core causes of catheter blockage and thrombosis, and significantly reducing the frequency of flushing and sealing. The valve core moves flexibly within the catheter, preventing contamination from external contact and avoiding increasing the size of the catheter seat, which would make it inconvenient to apply to the body during indwelling. This design directly solves the problems of traditional indwelling catheters that rely on frequent flushing and sealing, leading to blockage and thrombosis; it reduces the workload of medical staff and significantly lowers clinical risks.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to an indwelling catheter with a valve core. Background Technology

[0002] In clinical practice, indwelling catheters are widely used for intravenous infusions and establishing vascular access. When using traditional indwelling needle catheters, blood can easily flow back into the catheter and clot, forming a thrombus. This can not only block the catheter and affect infusion but also potentially cause complications. To avoid thrombosis, frequent flushing and sealing procedures are required, which increases the workload of medical staff, raises operational risks, and increases patient healthcare costs.

[0003] Meanwhile, other patents for anti-clogging indwelling catheters, such as the one published in CN109498897B, have the following drawbacks: First, the sealing tube enters through the isolation plug, resulting in high pushing and pulling forces. Second, the sealing tube moves through the needle channel rather than the medication channel, significantly increasing the overall size of the indwelling needle, making injection more difficult, and its position on the patient makes it easy to touch and move, causing the catheter to swing within the blood vessel, leading to discomfort and increasing the risk of phlebitis. Third, when the sealing tube partially exits the isolation plug, it is difficult to maintain a sealed state behind the plug; if exposed to outside air, it is at risk of contamination, affecting patient safety. These factors limit the indwelling time and cannot well meet the needs of patients requiring indwelling infusions. Therefore, there is an urgent need for an indwelling catheter that reduces the number of flushing and sealing cycles, has a long indwelling time, allows for closed movement, provides precise guidance, is easy to drive, and is highly safe to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide an indwelling catheter with a valve core, so as to solve the problem mentioned in the background art of the urgent need for an indwelling catheter that reduces the number of flushing and sealing cycles, has a long indwelling time, can be closed and moved, has precise guidance, is easy to drive, and has high safety.

[0005] To achieve the above objectives, the present invention provides an indwelling catheter with a valve core, comprising a catheter, the catheter being fixed to a catheter seat and left in a blood vessel after puncture, wherein the outlet of the catheter is adapted to and sealed with the head of the valve core.

[0006] A conduit holder, used to fix the conduit and connect the extension tube, is provided with a lateral connecting post channel;

[0007] The rivet is placed inside the conduit seat, with one end connected to the conduit and the other end provided with a flared guide structure, the inner cavity of which is connected to the conduit.

[0008] The catheter seat has a guide device inside, which is assembled inside the catheter seat and has a through-type double-end opening to form an axial channel and a side guide channel. The side guide channel is aligned with the side connecting column channel and the rivet cavity of the catheter seat to form a guide channel for the valve core.

[0009] An extension tube is provided, with one end connected to a catheter seat and the other end connected to an infusion interface assembly. The valve core is placed inside the drug channel, and a guide movement channel for the valve core is formed by a lateral connecting column channel, a side guide channel, and a rivet cavity.

[0010] The valve core has a head that matches the inner diameter of the outlet of the conduit to achieve a seal, and a tail that is connected to the valve core fixing seat.

[0011] The drive device is used to push or pull the valve core along the liquid channel and guide channel.

[0012] This setup, through the coordinated operation of various components, seals the valve core and catheter outlet to prevent blood backflow, and the precise guiding channel ensures the valve core moves within the catheter, thereby reducing the number of flushing attempts, preventing thrombosis, improving puncture success rate and usage stability, and making it suitable for indwelling catheter scenarios such as medical infusion.

[0013] As a preferred embodiment of the present invention, the side guide channel and the axial channel of the guide device work together to allow the valve core to slide within the guide tube.

[0014] This feature, with its specific structure of side guide channels working in conjunction with the axial channels, ensures that the valve core slides within the guide tube, further improving guidance accuracy and operational smoothness, and guaranteeing a tight seal between the valve core and the guide tube.

[0015] As a preferred embodiment of the present invention, the driving device forms a recess in the extension tube by physically pressing down the structure, and then drives the valve core to move by moving the physical driving structure. The minimum distance of the recess is less than that of the valve core fixing seat and greater than that of the valve core diameter. The extension tube increases in both directions at the recess to form a cavity, which facilitates the passage of the liquid medicine.

[0016] This design features a recessed area formed by physical pressure that fits the valve core and the fixed seat. The moving drive structure moves the valve core, and the cavities on both sides of the extension tube ensure smooth passage of the medicine, balancing sealing effect and infusion efficiency, making it highly efficient and practical to operate.

[0017] As a preferred embodiment of the present invention, the physical pressing structure and the flow stop clamp are designed as an integral part. The flow stop clamp has positioning holes at both ends, and the extension tube passes through the positioning holes. The inner side of the flow stop clamp is provided with a driving protrusion. The flow stop clamp is also provided with a pressure beam. The end of the flow stop clamp near the pressure beam is provided with a limiting surface. When the pressure beam is pressed down to the limiting surface, the driving protrusion is driven down to make the extension tube form a concave part.

[0018] This feature integrates the flow stop clamp with the physical pressure structure. The positioning hole ensures the straightness of the extension pipe, and the drive protrusion, pressure beam, and limiting surface work together to enable convenient pushing and pulling of the valve core, simplifying the operation process and improving ease of use.

[0019] As a preferred embodiment of the present invention, the limiting surface includes a first limiting surface and a second limiting surface, and the driving protrusion is configured as a double set.

[0020] This feature features dual-position limiting surfaces for precise control of the degree of concave formation in the extension tube, and dual sets of drive protrusions to enhance the fixing and driving effect. This ensures stable movement of the valve core and allows for quick closure of the pipeline to stop infusion, improving operational accuracy and scenario adaptability.

[0021] As a preferred embodiment of the present invention, the physical drive structure is fixed on an independent driver, and the independent driver has a protrusion on its inner side, and the protrusion is configured as a double group or a single group.

[0022] This feature features an independent actuator with a raised section, offering flexible operation and stable drive performance. The extended tubing cavity ensures drug flow, improves sealing, reduces the number of flushing cycles, and enhances operational reliability, making it suitable for various clinical scenarios.

[0023] As a preferred embodiment of the present invention, the valve core is made of medical polymer material or medical metal material, and the cross-sectional shape of the valve core fixing seat is any one of spherical, cylindrical, elliptical, square, triangular, rectangular or plum blossom shape, and its maximum size is smaller than the inner diameter of the extension tube. The inner core necking diameter of the valve core is smaller than the valve core head diameter, which increases flexibility and facilitates steering.

[0024] The valve core material is designed to meet medical application requirements, and the valve core mounting base features a variety of shapes to ensure stable installation and smooth movement.

[0025] As a preferred embodiment of the present invention, the valve core fixing seat has one or more through grooves on its maximum outer periphery.

[0026] This feature, which involves creating a through-groove, increases the cross-sectional area for the drug to pass through, thereby improving the infusion flow rate.

[0027] As a preferred embodiment of the present invention, the driving device is a magnetically driven structure, including a magnetic block. The valve core fixing seat is made of a magnetically conductive material. The magnetic block guides the valve core fixing seat of the magnetically conductive material through the action of a magnetic field, thereby realizing the reciprocating movement of the valve core.

[0028] This feature uses magnetic drive to enable non-contact reciprocating movement of the valve core, making operation convenient, and it works in conjunction with the sealing and guiding structure.

[0029] In a preferred embodiment of the present invention, the magnetic block is fixed to the flow stop clamp.

[0030] This design integrates the magnetic block and the flow stop clamp, simplifying the structural layout and allowing for simultaneous flow stop and valve core actuation during operation, thus improving operational flexibility.

[0031] As a preferred embodiment of the present invention, the magnetic block is fixed on an independent driver, and the magnetic block is arranged on one or both sides.

[0032] This feature allows the magnetic block to be fixed to an independent driver and supports different layouts, adapting to more clinical operation scenarios and enhancing the effect of reducing flushing times and operational adaptability.

[0033] As a preferred embodiment of the present invention, the driving device drives the valve core to move through a friction driving structure, which is fixed on the extension tube or the guide seat, and drives the valve core to move axially.

[0034] This design features a recessed area formed by physical pressure that fits the valve core and the fixed seat. The moving drive structure moves the valve core, and the cavities on both sides of the extension tube ensure smooth passage of the medicine, balancing sealing effect and infusion efficiency, making it highly efficient and practical to operate.

[0035] As a preferred embodiment of the present invention, the friction drive structure includes a connecting seat, a cover plate, a driving wheel assembly, a driven wheel assembly, a knob, and a sealing ring. The connecting seat has an inner cavity in the middle, the bottom of which is closed and the top is open. The periphery of the inner cavity is adapted to fit the cover plate. The inner cavity has two positioning holes for assembling the driving wheel pin and the driven wheel pin, respectively. The connecting seat has a fixing hole and a through hole at both ends. The fixing hole is used to connect the extension tube or the lateral connection port of the guide tube seat, and the through hole forms an axial liquid channel and a valve core channel. The driving wheel assembly includes a driving wheel and a driving wheel pin. The driving wheel has a mounting hole in the center, through which it is fixedly connected to the driving wheel pin. The outer periphery of the driving wheel is a straight structure or has anti-slip teeth. The two ends of the driving wheel pin rotate with the positioning hole of the connecting seat and the through hole of the cover plate, respectively. The active wheel pin is fixedly connected to the knob at one end and to the active wheel at the other end. An annular groove is provided on the outer circumference of the active wheel pin, and the sealing ring is fitted into this groove to seal the gap between the active wheel pin and the cover plate. The passive wheel assembly includes a passive wheel and a passive wheel pin. A mounting hole is provided in the center of the passive wheel, through which it is fixedly connected to the passive wheel pin. The outer circumference of the passive wheel is a straight structure or has anti-slip teeth. Both ends of the passive wheel pin are rotatably engaged with the positioning hole of the connecting seat and the blind hole of the cover plate, respectively. The passive wheel pin and the passive wheel are fixedly connected, and the active wheel and the passive wheel are arranged opposite each other and pre-pressed onto the valve core surface. The knob is fixedly connected to the end of the active wheel pin away from the active wheel. Rotating the knob can drive the active wheel pin and the active wheel to rotate synchronously, driving the valve core to move axially through the friction between the active wheel and the valve core.

[0036] This setting uses friction drive to control the axial movement of the valve core via a knob, ensuring precise and controllable operation. All components are well-sealed, guaranteeing drive stability, making it suitable for long-term infusion scenarios, and improving safety during use.

[0037] As a preferred embodiment of the present invention, the connecting seat, driving wheel, driving wheel pin, cover plate, driven wheel, driven wheel pin, and knob are made of polymer material or metal material.

[0038] As a preferred embodiment of the present invention, the driving device drives the valve core to move through a telescopic driving structure. The inner wall of the driving device is provided with a protrusion that engages with the valve core fixing seat. The device includes a telescopic guide tube. The original state of the telescopic guide tube is an extended state. When compressed forward, it generates displacement and drives the valve core to move to the outlet of the guide tube to achieve sealing.

[0039] This feature allows the valve core to move and seal when the telescopic conduit is compressed. The protrusion on the inner wall of the drive device engages with the valve core fixing seat to ensure synchronization. It is easy to operate, enhances sealing reliability, and helps extend the conduit's dwell time.

[0040] As a preferred embodiment of the present invention, it further includes a limiting plate, one end of which is rotatably connected to the driving device via a hinge, and the other end is used to limit the end of the telescopic conduit.

[0041] This feature includes a limit plate that secures the end of the telescopic conduit via a hinge to prevent rebound in the sealed state, ensuring a continuous seal and further improving the efficiency of reducing the number of flushing cycles and enhancing operational stability.

[0042] As a preferred embodiment of the present invention, when used for open indwelling needles, it further includes a first positioning sleeve, which is adapted to be installed on the inner side of the tail end of the catheter seat. The outer side of the tail end of the catheter seat is connected to a vent plug seat through a Luer cone. A vent plug is installed at the end of the vent plug seat. A spiral cap is installed on the outside of the vent plug. A second positioning sleeve is installed on the outer side of the valve core near the catheter seat. A fixing seat is also installed at the tail end of the extension tube.

[0043] This new feature is designed to accommodate open-type indwelling needles. After puncture and needle removal, when no infusion is being administered, blood flows from the catheter into the extension tube. Therefore, a positioning sleeve is placed between the extension tube and the catheter seat. The outer diameter of the sleeve seals with the side post of the catheter seat, and the inner hole engages with the valve core to prevent blood and medication from flowing into the extension tube. The vent plug facilitates confirmation of successful puncture, and the spiral cap ensures a tight seal. Together with the core structure, this design reduces the number of flushing attempts, prevents thrombosis, and improves puncture accuracy and safety.

[0044] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0045] 1. In this indwelling catheter with a valve core, the valve core head precisely matches and seals with the inner diameter of the catheter outlet, preventing blood reflux into the catheter from the source, completely eliminating the core cause of thrombosis, and greatly reducing the frequency of flushing. This design directly solves the pain point of traditional indwelling catheters relying on frequent flushing: it reduces the daily workload of medical staff, avoids catheter blockage and thrombosis, and saves on flushing consumable costs, significantly reducing the medical and economic burden on patients. The valve core of this patent is placed inside the medication channel, without increasing the external dimensions of existing indwelling needle products, maintaining the existing operating techniques of medical staff, facilitating fixation at the patient's injection site, and its shape is almost identical to that of indwelling catheters widely used in clinical practice, causing no discomfort. The valve core is sealed inside the medication channel, preventing contact with the outside world and eliminating the risk of exposure. When the valve core is open, medication is delivered through the medication channel. When the valve core is closed, the medication channel is shut off, preventing blood reflux.

[0046] 2. In this indwelling catheter with a valve core, the guiding device features a through-type double-ended opening design, forming an axial channel and a side guiding channel. It precisely aligns with the lateral connecting column channel of the catheter seat and the inner cavity of the rivet. Combined with the flared guiding arc surface and guiding angle of the rivet, a precise guiding path is constructed for sliding within the catheter. This structure ensures smooth and unobstructed needle puncture and valve core push / pull-back processes, significantly improving the puncture success rate. Simultaneously, it ensures a tight seal between the valve core and the catheter outlet, preventing seal failure due to positioning deviations and further guaranteeing reliability for clinical use.

[0047] 3. In this indwelling catheter with a valve core, the patent provides four driving solutions to suit different scenarios: magnetic drive, physical pressure drive, friction drive, and telescopic drive. Magnetic drive (integrated flow stop clamp / independent actuator single-sided / double-sided layout) enables non-contact operation and is suitable for aseptic scenarios where tubing contact needs to be minimized. Physical pressure drive (integrated flow stop clamp with double protrusions / independent actuator) drives the valve core through pressing and sliding, making it convenient to operate and suitable for rapid sealing requirements. Friction drive (active wheel-passive wheel-knob structure) controls the movement of the valve core through rotation, while telescopic drive (telescopic catheter) achieves sealing through compression displacement.

[0048] 4. In this indwelling catheter with valve core, the extension tube recess forms cavities on both sides when the valve core is driven, ensuring that the drug infusion is not obstructed; the axial through groove design of the valve core fixing seat increases the cross-sectional area through which the drug passes, improves the infusion flow rate, and meets the infusion needs of different rates in clinical practice. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0050] Figure 2 This is one of the schematic diagrams illustrating the operation of the present invention;

[0051] Figure 3 This is a second schematic diagram of the operation of the present invention;

[0052] Figure 4 For the present invention Figure 3 A magnified view of a portion of point A in the middle;

[0053] Figure 5 This is a schematic diagram of the catheter seat structure in this invention;

[0054] Figure 6 This is a schematic diagram of the rivet structure in this invention;

[0055] Figure 7 This is a schematic diagram of Embodiment 2 of the present invention;

[0056] Figure 8 This is a schematic diagram of Embodiment 3 of the present invention;

[0057] Figure 9 This is a schematic diagram of Embodiment 4 of the present invention;

[0058] Figure 10 This is a schematic diagram of Embodiment 5 of the present invention;

[0059] Figure 11 This is a schematic diagram of the cavity in Embodiment 5 of the present invention;

[0060] Figure 12 This is a schematic diagram of Embodiment 6 of the present invention;

[0061] Figure 13 This is a schematic diagram of Embodiment 7 of the present invention;

[0062] Figure 14 This is a schematic diagram of Embodiment 8 of the present invention;

[0063] Figure 15 This is one of the schematic diagrams of Embodiment 9 of the present invention;

[0064] Figure 16 This is a second schematic diagram of Embodiment 9 of the present invention;

[0065] Figure 17 This is a second schematic diagram of Embodiment 10 of the present invention;

[0066] Figure 18 This is a schematic diagram of Embodiment 11 of the present invention;

[0067] Figure 19 This is a schematic diagram of Embodiment 12 of the present invention;

[0068] Figure 20 This is a schematic diagram of Embodiment 13 of the present invention;

[0069] The meanings of the labels in the diagram are as follows:

[0070] 1. Steel needle; 2. Guide tube; 2.1. Outlet; 3. Guide tube seat; 3.1. Lateral connecting column channel; 3.2. Lateral connector; 4. Rivet; 4.1. Rivet inner cavity; 4.2. Trumpet-shaped guide structure; 5. Needle handle; 6. Isolation plug; 7. Guide device; 7.1. Side guide channel; 7.2. Axial channel; 8. Extension tube; 8.1. Recess; 8.2. Cavity; 8.3. Telescopic guide tube; 9. Valve core; 9.1. Valve core head; 9.2. Valve core fixing seat; 9.3. Inner core; 10. Flow stop clamp; 10.1. Drive protrusion; 10.2. Pressure beam; 10.3. 10.4 First limiting surface; 11. Second limiting surface; 12. Infusion interface assembly; 13. Independent driver; 14.1 Protrusion; 15.2 Hinge; 16. Magnetic block; 17. First positioning sleeve; 18. Vent plug seat; 19. Screw cap; 20. Vent plug; 21. Second positioning sleeve; 22. Fixing seat; 23. Connecting seat inner cavity; 24. Fixing hole; 25. Through hole; 26. Knob; 27. Driven wheel; 28. Driven wheel pin; 29. ​​Cover plate; 20. Driven wheel; 20. Driven wheel pin; 21. Sealing ring; 22. Limiting plate. Detailed Implementation

[0071] 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.

[0072] Example 1

[0073] This invention provides an indwelling catheter with a valve core, such as... Figures 1-6As shown, the device includes a steel needle 1 connected to a needle handle 5, passing through an isolation plug 6 and placed inside a catheter 2, with the needle tip extending out of the catheter 2 for puncturing blood vessels; a catheter 2 fixed to a catheter seat 3, left in the blood vessel after puncture, with the outlet 2.1 of the catheter 2 fitted and sealed to the valve head 9.1; a catheter seat 3 for fixing the catheter 2 and connecting an extension tube 8, and having a lateral connection post channel 3.1; a rivet 4 placed inside the catheter seat 3, one end connected to the catheter 2, and the other end having a flared guide structure 4.2, the inner cavity 4.1 of which communicates with the catheter 2; and a guide device 7 assembled on the catheter. Inside seat 3, there is a through-type double-ended opening, forming an axial channel 7.2 and a side guide channel 7.1. The side guide channel 7.1 is precisely aligned with the lateral connecting column channel 3.1 and the rivet inner cavity 4.1 of the catheter seat 3, forming the guide channel of valve core 9. Extension tube 8 is connected to the catheter seat 3 at one end and to the infusion interface assembly 11 at the other end. Valve core 9 is placed inside the drug channel. Valve core 9 has its head fitted with the inner diameter of the outlet 2.1 of the catheter 2 to achieve a seal, and its tail is connected to the valve core fixing seat 9.2. A drive device is used to push or pull the valve core 9 along the drug channel and the guide movement channel.

[0074] In this embodiment, the side guide channel 7.1 and the axial channel 7.2 of the guide device 7 work together to allow the valve core 9 to slide within the guide tube.

[0075] The steel needle 1, catheter 2, catheter seat 3, rivet 4, guide device 7 and other components work together. The axial channel 72 of the guide device 7 is precisely aligned with the side guide channel 71 and the side connecting column channel 31 of the catheter seat 3 and the inner cavity 41 of the rivet, so that the valve core 9 can slide in the catheter. This ensures that the valve core head 91 and the outlet 2.1 of the catheter 2 are sealed, preventing blood from entering, eliminating thrombosis, greatly reducing the frequency of flushing and sealing the catheter, improving the puncture success rate and device stability, and making it suitable for medical infusion scenarios.

[0076] Example 2

[0077] Based on Example 1, such as Figure 7 As shown, the valve core 9 is made of medical-grade polymer material or medical-grade metal material. The cross-sectional shape of the valve core fixing seat 9.2 can be any one of spherical, cylindrical, elliptical, square, triangular, rectangular, or plum blossom shape, and its maximum size is smaller than the inner diameter of the extension tube 8. The diameter of the inner core neck 9.3 of the valve core 9 is smaller than the diameter of the valve core 9 head, increasing flexibility and facilitating steering. The valve core 9 is made of medical-grade polymer or metal material, and the valve core fixing seat 92 has various cross-sectional shapes and its maximum size is adapted to the inner diameter of the extension tube 8.

[0078] Example 2.1

[0079] Furthermore, the valve core mounting seat 9.2 has one or more through grooves on its maximum outer periphery. The through grooves on its axial outer periphery increase the cross-sectional area for the liquid to pass through, thereby increasing the infusion flow rate. At the same time, they ensure that the valve core 9 is installed securely and moves smoothly. Combined with the sealing design, this further enhances the effect of reducing the number of flushing cycles and improving the reliability of use.

[0080] Example 3

[0081] Based on Example 1, such as Figure 8 As shown, the driving device is a magnetic drive structure, including a magnetic block 13. The valve core fixing seat 9.2 is made of magnetic material. The magnetic block 13 guides the valve core fixing seat 9.2 of the magnetic material through the magnetic field, realizing the reciprocating movement of the valve core 9. The magnetic block 13 is fixed to the flow stop clamp 10.

[0082] The magnetic block 13 is fixed to the flow stop clamp 10, and the valve core fixing seat 92 is made of magnetic material. The valve core fixing seat 92 is guided by the magnetic field in a non-contact manner to realize the reciprocating movement of the valve core 9. The operation is convenient and avoids touching the pipeline, which is combined with the sealing and guiding structure.

[0083] Example 4

[0084] Based on Example 1, such as Figure 9 As shown, the drive device is a magnetic drive structure, including a magnetic block 13. The valve core fixing seat 9.2 is made of magnetic material. The magnetic block 13 guides the valve core fixing seat 9.2 of the magnetic material through the magnetic field, realizing the reciprocating movement of the valve core 9. The magnetic block 13 is fixed on the independent driver 12, and the magnetic block 13 is arranged on one side or both sides.

[0085] The magnetic block 13 is fixed to the independent actuator 12, which can be arranged on one or both sides. The magnetic field guides the valve core fixing seat 92 to move the valve core 9. The independent actuator 12 is suitable for more operating scenarios. With the precise guidance and sealing structure, it enhances the effect of reducing the number of flushing times and improves the flexibility of operation and clinical adaptability.

[0086] Example 5

[0087] Based on Example 1, such as Figure 10 , Figure 11 As shown, the driving device uses a physical pressing structure to form a recess 8.1 in the extension tube 8, and then moves the valve core 9 by moving the physical driving structure. The minimum distance of the recess 8.1 is less than that of the valve core fixing seat 9.2 and greater than that of the valve core 9. The extension tube 8 increases in both directions at the recess to form a cavity 8.2, which facilitates the passage of liquid medicine.

[0088] Furthermore, the physical pressure structure is integrated with the flow stop clamp 10. The flow stop clamp 10 has positioning holes at both ends, through which the extension tube 8 passes. The inner side of the flow stop clamp 10 is provided with a driving protrusion 10.1. The flow stop clamp 10 is also provided with a pressure beam 10.2. A limiting surface is provided at one end of the flow stop clamp 10 near the pressure beam 10.2. When the pressure beam 10.2 is pressed down to the limiting surface, it drives the driving protrusion 10.1 to press down, causing the extension tube 8 to form a recess 8.1.

[0089] The drive unit physically presses down to form a recess 81 in the extension tube 8. The size of the recess 81 is adapted to the valve core 9 and the valve core fixing seat 92. The moving drive structure drives the valve core 9 to move, and cavities 82 are formed on both sides of the recess in the extension tube 8 to ensure the passage of liquid medicine. The flow stop clamp 10 is integrated with the physical pressing structure. The drive protrusion 101, the pressure beam 102 and the limiting surface cooperate to realize convenient pushing / pulling of the valve core 9, which is efficient in operation and takes into account both sealing and smooth infusion.

[0090] Example 6

[0091] Based on Example 4, such as Figure 12 As shown, the limiting surface includes a first limiting surface 10.3 and a second limiting surface 10.4, and the driving protrusion 10.1 is set as a double group.

[0092] Based on Example 4, the limiting surface includes a first limiting surface 103 and a second limiting surface 104. The dual-drive protrusion 101 design allows the downward pressure beam 102 to precisely control the degree of formation of the recess 81 in the extension tube 8. This ensures stable movement of the valve core 9 and allows the extension tube 8 to be quickly closed by the second limiting surface 104, stopping the delivery of the liquid medicine and improving operational accuracy and scenario adaptability.

[0093] Example 7

[0094] Based on Example 1, such as Figure 13 As shown, the driving device uses a physical pressing structure to form a recess 8.1 in the extension tube 8, and then moves the valve core 9 by moving the physical driving structure. The minimum distance of the recess 8.1 is less than that of the valve core fixing seat 9.2 and greater than that of the valve core 9. The extension tube 8 increases in both directions at the recess to form a cavity 8.2, which facilitates the passage of liquid medicine.

[0095] Example 7.1

[0096] Furthermore, such as Figure 13 As shown, the physical drive structure is fixed on the independent driver 12. The independent driver 12 has a protrusion 12.1 on its inner side, and the protrusion 12.1 is set as a single group. The valve core 9 has two valve core fixing seats 9.2. The protrusion 12.1 is located between the two valve core fixing seats 9.2, making it easier for the valve core 9 to move.

[0097] Example 7.2

[0098] Furthermore, such as Figure 13 As shown, the physical drive structure is fixed on the independent driver 12. The independent driver 12 has a protrusion 12.1 on its inner side, and the protrusion 12.1 is set in two groups.

[0099] The physical drive structure is fixed to the independent actuator 12. The double sets of protrusions 12.1 press down on the extension tube 8 to form a recess 81. The size of the recess 81 is adapted to ensure the movement of the valve core 9, and the cavity 82 ensures the passage of the drug solution. The independent actuator 12 is flexible in operation, and the double sets of protrusions 12.1 enhance the fixing and driving effect, making the movement of the valve core 9 more stable, improving the reliability of sealing and reducing the number of flushing operations, and adapting to various clinical scenarios.

[0100] Example 8

[0101] Based on Example 1, such as Figure 14 As shown, the driving device drives the valve core 9 to move through the friction drive structure, which is fixed on the extension tube 8 and drives the valve core to move axially.

[0102] Example 8.1

[0103] Furthermore, the friction drive structure includes a connecting seat 20, a cover plate 24, a driving wheel assembly, a driven wheel assembly, a knob 21, and a sealing ring 27. The connecting seat 20 has an inner cavity 20.1 in the middle, which is closed at the bottom and open at the top. The inner cavity 20.1 is adapted to fit the cover plate 24. The inner cavity 20.1 has two positioning holes, which are used to assemble the driving wheel pin 23 and the driven wheel pin 26, respectively. The connecting seat 20 has a fixing hole 20.2 and a through hole 20.3 at both ends. The fixing hole 20.2 is used to connect the extension tube 8 or the lateral connection port of the guide tube seat. The through hole 20.3 forms the axial liquid channel and the valve core channel. The driving wheel assembly includes a driving wheel 22 and a driving wheel pin 23. The driving wheel 22 has a mounting hole in the center, which is used to fix it to the driving wheel pin 23. The outer periphery of the driving wheel 22 is a straight structure or has anti-slip teeth. The two ends of the driving wheel pin 23 are respectively connected to the positioning hole of the connecting seat 20 and the through hole of the cover plate 24. The active wheel pin 23 is fixedly connected to the knob 21 at one end and to the active wheel 22 at the other end. The active wheel pin 23 has an annular groove on its outer circumference, and the sealing ring 27 is assembled in the groove to seal the gap between the active wheel pin 23 and the cover plate 24. The passive wheel assembly includes a passive wheel 25 and a passive wheel pin 26. The passive wheel 25 has a mounting hole in its center, through which it is fixedly connected to the passive wheel pin 26. The outer circumference of the passive wheel 25 is a straight structure or has anti-slip teeth. The two ends of the passive wheel pin 26 are respectively rotated and engaged with the positioning hole of the connecting seat 20 and the blind hole of the cover plate 24. The passive wheel pin 26 is fixedly connected to the passive wheel 25, and the active wheel 22 is arranged opposite to the passive wheel 25 and pre-pressed on the surface of the valve core 9. The knob 21 is fixedly connected to the end of the active wheel pin 23 away from the active wheel 22. Rotating the knob 21 can drive the active wheel pin 23 and the active wheel 22 to rotate synchronously. The friction between the active wheel 22 and the valve core 9 drives the valve core 9 to move axially.

[0104] Furthermore, the connecting seat 20, the driving wheel 22, the driving wheel pin 23, the cover plate 24, the driven wheel 25, the driven wheel pin 26, and the knob 21 are made of polymer materials or metal materials and have sterilization and bacteriostatic functions.

[0105] The friction-driven structure uses a driving wheel 22 and a driven wheel 25 to preload the valve core 9. Rotating the knob 21 drives the driving wheel 22 to move the valve core 9 axially through friction, resulting in precise and controllable operation. The connecting seat 20, driving wheel 22, and other components are made of compatible materials, and the sealing ring 27 ensures a tight seal. This not only achieves stable driving of the valve core 9 but also reduces the risk of infection, enhancing safety by minimizing the number of flushing cycles and improving long-term safety.

[0106] Example 9

[0107] Furthermore, such as Figure 15 , 16As shown, the friction drive structure is independently designed and fixed on the extension tube 8 or on the guide tube seat 3. When fixed on the guide tube seat 3, the lateral connecting column channel 3.1 on one side of the guide tube seat 3 becomes a lateral connector 3.2, which is fixedly connected to one side of the friction drive structure through the lateral connector 3.2, and the other side of the friction drive structure is connected to the extension tube 8.

[0108] The friction drive structure can be independently fixed to the extension tube 8 or the catheter seat 3. When fixed to the catheter seat 3, it is connected via the lateral connector 32, adapting to different installation requirements and improving the flexibility of device layout. The friction drive ensures stable movement of the valve core 9, and together with the sealing and guiding structure, maintains the effect of reducing the number of flushing cycles and ensuring safety in use, thus broadening the clinical application scenarios.

[0109] Example 10

[0110] Based on Example 1, such as Figure 17 As shown, the drive device moves the valve core 9 through a telescopic drive structure. The inner wall of the drive device is provided with a protrusion 12.1 that engages with the valve core fixing seat 9.2. The drive device includes a telescopic guide tube 8.3. The telescopic guide tube 8.3 is originally in an extended state. When compressed forward, it generates displacement and drives the valve core 9 to move to the outlet 2.1 of the guide tube 2 to achieve sealing.

[0111] Furthermore, it also includes a limiting plate 28, one end of which is rotatably connected to the drive device via a hinge 12.2, and the other end is used to limit the end of the telescopic conduit 8.3.

[0112] The telescopic conduit 83 initially extends, and upon compression, it moves the valve core 9 to the outlet 2.1 of the conduit 2 for sealing. The protrusion 121 on the inner wall of the drive device engages with the valve core fixing seat 92 to ensure synchronous movement. The limiting plate 28 limits the end of the telescopic conduit 83 through the hinge 122, fixing the sealing state. This simplifies operation, enhances sealing reliability, and further ensures the reduction of flushing times and the extension of retention time.

[0113] Example 11

[0114] When used for open-type indwelling needles, such as Figure 18 As shown, it also includes a first positioning sleeve 14, which is adapted to be installed on the inner side of the tail end of the conduit seat 3. The outer side of the tail end of the conduit seat 3 is connected to a vent plug seat 15 through a Luer cone. A vent plug 17 is installed at the end of the vent plug seat 15. A spiral cap 16 is installed on the outside of the vent plug 17. A second positioning sleeve 18 is installed on the outer side of the valve core 9 near the conduit seat 3. A fixing seat 19 is also installed at the tail end of the extension tube 8.

[0115] The open-type indwelling needle is equipped with a first positioning sleeve 14, a vent plug seat 15, a vent plug 17, a spiral cap 16, a second positioning sleeve 18, and a fixing seat 19. The second positioning sleeve 18 prevents blood backflow, the vent plug 17 facilitates observation of blood return to determine successful puncture, and the spiral cap 16 ensures a seal. All components work together with the core structure to reduce the number of flushing cycles, prevent thrombosis, and improve puncture accuracy and safety of use.

[0116] Example 12

[0117] When the drive unit is behind the infusion interface assembly 11, such as Figure 19 As shown, a second positioning sleeve 18 is installed on the outer side of the valve core 9 near the guide seat 3, and a fixing seat 19 is also installed at the tail end of the extension tube 8.

[0118] The drive unit is located behind the infusion interface assembly 11. A second positioning sleeve 18 is installed on the outer side of the valve core 9 near the catheter seat 3. A fixing seat 19 is installed at the tail end of the extension tube 8. The second positioning sleeve 18 prevents blood backflow, and the fixing seat 19 ensures the stability of the drive unit during operation. Together with the sealing, guiding and drive structure, it maintains the effect of reducing the number of flushing times, adapts to specific pipeline layout requirements, and improves the reliability of use.

[0119] Example 13

[0120] When used in a midline catheter, such as Figure 20 As shown, the extension tube 8 consists of two parallel tubes, one end of which is connected to the catheter seat 3. The other end is connected to the infusion interface assembly 11. A second positioning sleeve 18 is installed on the outer side of the valve core 9 near the catheter seat 3.

[0121] In the midline catheter scenario, two extension tubes 8 are connected in parallel to the catheter seat 3 and the infusion interface assembly 11. A second positioning sleeve 18 is installed on the outer side of the valve core 9 near the catheter seat 3. The dual extension tubes 8 improve the efficiency of drug infusion and provide redundancy protection. The second positioning sleeve 18 prevents blood backflow. Together with the core sealing, guiding and driving structure, the midline catheter can reduce the number of flushing times, prevent thrombosis, and meet the needs of long-term intravenous infusion.

[0122] When using the indwelling catheter with valve core of the present invention, the steps are as follows:

[0123] I. Puncture Preparation Stage

[0124] Assembly device: Complete the component assembly according to the corresponding embodiment, ensuring that the steel needle 1 is fixedly connected to the needle handle 5, passes through the isolation plug 6 and is placed inside the catheter 2, with the needle tip protruding from the catheter 2; the catheter 2 and the catheter seat 3 are fixed by rivets 4, with the flared guide structure 4.2 of the rivet 4 facing the inside of the catheter seat 3; the catheter seat 3 has a guide device 7, which is assembled inside the catheter seat 3, and its side guide channel 7.1 is precisely aligned with the side connecting column channel 3.1 and the inner cavity 4.1 of the catheter seat 3, forming the guide channel of the valve core 9; one end of the extension tube 8 is connected to the catheter seat 3, and the other end is connected to the infusion interface assembly 11. The valve core 9 is placed inside the extension tube 8, and its tail is connected to the valve core fixing seat 9.2.

[0125] Drive device reset: Adjust the initial state according to the drive type - magnetic drive (Examples 3, 4) to make the magnetic block 13 and the valve core fixing seat 9.2 in the initial downward alignment; physical downward drive (Examples 5, 6, 7) to make the drive protrusion 10.1 of the stop clamp 10 or independent driver 12 press down the extension tube 8; friction drive (Examples 8, 9) to rotate the knob 21 to make the driving wheel 22 and the driven wheel 25 in the downward state; telescopic drive (Example 10) to keep the telescopic guide tube 8.3 in the downward state.

[0126] Preparation for open-type indwelling needle (Example 11): Install the first positioning sleeve 14 on the inner side of the tail end of the catheter seat 3, connect the vent plug seat 15 to the outer side of the tail end of the catheter seat 3 through the Luer cone, assemble the vent plug 17 on the end of the vent plug seat 15, and tighten the spiral cap 16; install the second positioning sleeve 18 on the outer side of the valve core 9 near the catheter seat 3, and install the fixing seat 19 at the tail end of the extension tube 8.

[0127] Special preparation for the midline catheter (Example 13): Connect the two extension tubes 8 in parallel to the catheter seat 3 and the infusion interface assembly 11, and install the second positioning sleeve 18 on the outer side of the valve core 9 near the catheter seat 3.

[0128] II. Puncture and Catheter Placement Stage

[0129] Puncture procedure: The medical staff holds the needle handle 5 and punctures the target blood vessel. During the puncture, the blood return is observed through the vent plug 17 (Example 11) to determine that the steel needle 1 has been successfully punctured (for non-open indwelling needles, the blood return is observed by observing the blood return. The blood returns through the needle tip into the inner hole of the steel needle, then through the side hole on the steel needle, into the catheter, and then into the catheter seat).

[0130] Closed-loop indwelling needle catheter placement: After successful puncture, fix the catheter seat 3, slowly pull out the steel needle 1, and the isolation plug 6 automatically seals the inside of the catheter seat 3 to form a closed space. The catheter 2 is placed in the blood vessel, and the outlet 2.1 of the catheter 2 is located in the blood vessel, ready for drug infusion.

[0131] Open indwelling needle catheter placement: After successful puncture, fix the catheter seat 3, slowly pull out the steel needle 1, and leave the catheter 2 in the blood vessel. The outlet 2.1 of the catheter 2 is located in the blood vessel, ready for drug infusion.

[0132] III. Valve Core Sealing Drive Stage

[0133] According to the driving method corresponding to the embodiment, the valve core 9 is driven to move along the guide channel to the liquid outlet 2.1 of the conduit 2 to achieve sealing:

[0134] Magnetic drive (Examples 3 and 4): The magnetic block 13, which is fixed to the flow stop clamp 10 (Example 3) or the independent driver 12 (Example 4, single / double magnetic block 13 layout), is moved and guided by the magnetic field to guide the valve core fixing seat 9.2 of the magnetic material, thereby driving the valve core 9 to slide along the guide channel. The valve core head 9.1 is precisely sealed with the liquid outlet 2.1 of the conduit 2.

[0135] Physical pressure drive (Examples 5, 6, 7):

[0136] Integrated flow stop clamp (Examples 5 and 6): Press down the pressure beam 102 to the first limit surface 103 (Example 6 can be switched to the second level), drive the protrusion 101 (double set / single set) to press down the extension tube 8 to form a recess 8.1, move the flow stop clamp 10 along the axial direction of the extension tube 8, and drive the valve core 9 to move to the sealing position through the recess 8.1. Cavities 8.2 are formed on both sides of the recess of the extension tube 8 to facilitate the passage of liquid medicine.

[0137] Independent actuator type (Example 7): Since it is initially in a depressed state, the dual-set drive protrusion 101 presses down the extension tube 8 to form a recess 8.1, and the actuator moves along the extension tube 8 to drive the valve core 9 to complete the sealing.

[0138] Friction drive (Examples 8 and 9): Rotate knob 21 to drive drive pin 23 and drive wheel 22 to rotate synchronously. Drive wheel 22 and driven wheel 25 pre-press valve core 9, and drive valve core 9 to move axially to the sealing position through friction. If the friction drive structure is fixed to guide seat 3 (Example 9), the driving force is transmitted through side joint 3.2.

[0139] Telescopic drive (Example 10): The telescopic conduit 8.3 is compressed forward, and its displacement drives the valve core fixing seat 9.2 through the protrusion 12.1 on the inner wall of the drive device, so that the valve core 9 moves to the sealing position. The limit plate 28 is rotated to limit the end of the telescopic conduit 8.3 through the hinge 12.2 to fix the sealing state.

[0140] Special operation of the drive device after the infusion interface assembly 11: The drive device is located behind the infusion interface assembly 11. The valve core 9 is sealed by moving the drive device. The fixed seat 19 ensures the stability of operation. The second positioning sleeve 18 prevents blood backflow.

[0141] IV. Drug Infusion Stage

[0142] Connect the infusion device: Connect the infusion device to the infusion interface assembly 11 and confirm that there are no bends or leaks in the tubing.

[0143] Infusion regulation: The infusion rate is adjusted according to clinical needs. The drug solution enters the blood vessel through the extension tube 8, catheter seat 3, rivet lumen 4.1, and outlet 2.1 of catheter 2. The axial through groove of valve core fixing seat 9.2 (Example 2) increases the cross-sectional area through which the drug solution passes, thereby increasing the infusion flow rate.

[0144] Emergency stop operation (Example 6): When it is necessary to suspend the infusion, press down the pressure beam 102 to the second limit surface 104, quickly close the extension tube 8, and stop the delivery of the medicine.

[0145] V. Subsequent Operation Stage

[0146] Sealing adjustment: When the seal needs to be released, reverse the operation of the corresponding drive device - the magnetic drive moves the magnetic block 13 in the opposite direction, the physical drive pulls back the flow stop clamp 10 or the driver, the friction drive rotates the knob 21 in the opposite direction, the telescopic drive releases the limit plate 28 and extends the telescopic guide tube 8.3, and drives the valve core 9 to pull back and disengage from the outlet 2.1 of the guide tube 2.

[0147] Conduit maintenance: Reduce flushing, regularly check the sealing condition and pipeline patency, and fine-tune the valve core 9 position through the drive device to ensure sealing effect and extend the dwell time.

[0148] Catheter removal: After confirming that no indwelling is needed, hold the catheter hub 3 and slowly pull out the catheter 2. Wrap the needle tip with the safety device to prevent accidental puncture.

[0149] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An indwelling catheter with a valve core, characterized in that: include A steel needle (1) is connected to a needle handle (5), passes through an isolation plug (6) and is placed inside a catheter (2), with the needle tip extending out of the catheter (2) for puncturing blood vessels; The catheter (2) is fixed to the catheter seat (3) and left in the blood vessel after puncture. The outlet (2.1) of the catheter (2) is adapted to seal the valve core head (9.1). The catheter seat (3) is used to fix the catheter (2) and connect the extension tube (8), and is provided with a lateral connection column channel (3.1). Rivet (4), the rivet (4) is placed in the conduit seat (3), one end is connected to the conduit (2), and the other end is provided with a trumpet-shaped guide structure (4.2), the inner cavity (4.1) of which is connected to the conduit (2); The catheter seat (3) has a guide device (7) inside. The guide device (7) is assembled inside the catheter seat (3) and has a through double-ended opening to form an axial channel (7.2) and a side guide channel (7.1). The side guide channel (7.1) is aligned with the side connecting column channel (3.1) and the rivet cavity (4.1) of the catheter seat (3) to form the guide channel of the valve core (9). Extension tube (8), one end of the extension tube (8) is connected to the catheter seat (3), and the other end is connected to the infusion interface assembly (11). The valve core (9) is placed inside the drug channel, and the valve core (9) is guided to move through the lateral connecting column channel (3.1), the side guide channel (7.1) and the rivet cavity (4.1). The valve core (9) has its head fitted with the inner diameter of the outlet (2.1) of the conduit (2) to achieve a seal, and its tail is connected to the valve core fixing seat (9.2). When the valve core is open, it enables the delivery of medicine through the medicine channel. When the valve core is closed, it enables the closure of the medicine channel and prevents blood backflow. The driving device is used to push or pull the valve core (9) along the liquid channel and the guide channel. The side guide channel (7.1) and the axial channel (7.2) of the guide device (7) work together to make the valve core (9) slide in the guide tube.

2. The indwelling catheter with valve core according to claim 1, characterized in that: The drive device uses a physical pressing structure to form a recess (8.1) in the extension tube (8), and then uses a moving physical drive structure to move the valve core (9). The minimum distance of the recess (8.1) is less than that of the valve core fixing seat (9.2) and greater than that of the valve core (9). The extension tube (8) increases in both directions at the recess to form a cavity (8.2), which facilitates the passage of the liquid medicine.

3. The indwelling catheter with valve core according to claim 2, characterized in that: The physical pressure structure is integrated with the flow stop clamp (10). The flow stop clamp (10) has positioning holes at both ends. The extension tube (8) passes through the positioning holes. The inner side of the flow stop clamp (10) is provided with a driving protrusion (10.1). The flow stop clamp (10) is also provided with a pressure beam (10.2). The end of the flow stop clamp (10) near the pressure beam (10.2) is provided with a limiting surface. When the pressure beam (10.2) is pressed down to the limiting surface, the driving protrusion (10.1) is driven down to make the extension tube (8) form a concave part (8.1).

4. The indwelling catheter with valve core according to claim 3, characterized in that: The limiting surface includes a first limiting surface (10.3) and a second limiting surface (10.4), and the driving protrusion (10.1) is set as a double group.

5. The indwelling catheter with valve core according to claim 2, characterized in that: The physical drive structure is fixed on the independent driver (12), and the independent driver (12) has a protrusion (12.1) on its inner side, and the protrusion (12.1) is configured as a double group or a single group.

6. The indwelling catheter with valve core according to claim 1, characterized in that: The valve core (9) is made of medical polymer material or medical metal material. The cross-sectional shape of the valve core fixing seat (9.2) is any one of spherical, cylindrical, elliptical, square, triangular, rectangular or plum blossom shape. Its maximum size is smaller than the inner diameter of the extension tube (8). The diameter of the inner core neck (9.3) of the valve core (9) is smaller than the diameter of the valve core (9) head, which increases flexibility and facilitates steering.

7. The indwelling catheter with valve core according to claim 6, characterized in that: The valve core fixing seat (9.2) has one or more through grooves on its outermost periphery.

8. The indwelling catheter with valve core according to claim 1, characterized in that: The driving device is a magnetic drive structure, including a magnetic block (13). The valve core fixing seat (9.2) is made of magnetic material. The magnetic block (13) pulls the magnetic material valve core fixing seat (9.2) through the magnetic field, realizing the reciprocating movement of the valve core (9).

9. The indwelling catheter with valve core according to claim 8, characterized in that: The magnetic block (13) is fixed to the flow stop clamp (10).

10. The indwelling catheter with valve core according to claim 8, characterized in that: The magnetic block (13) is fixed on the independent driver (12), and the magnetic block (13) is arranged on one side or both sides.

11. The indwelling catheter with valve core according to claim 1, characterized in that: The driving device drives the valve core (9) to move through a friction driving structure. The friction driving structure is fixed on the extension tube (8) or the guide seat (3) to drive the valve core (9) to move axially.

12. The indwelling catheter with valve core according to claim 11, characterized in that: The friction drive structure includes a connecting seat (20), a cover plate (24), a driving wheel assembly, a driven wheel assembly, a knob (21), and a sealing ring (27). The connecting seat (20) has an inner cavity (20.1) in the middle. The bottom of the inner cavity (20.1) is closed and the top is open. The inner cavity (20.1) is adapted to fit the cover plate (24) around its perimeter. The inner cavity (20.1) has two positioning holes, which are used to assemble the driving wheel pin (23) and the driven wheel pin (26), respectively. The connecting seat (20) has a fixing hole (20.2) and a through hole (26) at both ends, respectively. 0.3), the fixing hole (20.2) is used to connect the extension tube (8) or the lateral connection port of the guide tube seat, and the through hole (20.3) forms the axial liquid channel and the valve core channel; the drive wheel assembly includes a drive wheel (22) and a drive wheel pin (23), the drive wheel (22) has a mounting hole in the center, and is fixedly connected to the drive wheel pin (23) through the mounting hole, the outer periphery of the drive wheel (22) is a straight structure or has anti-slip teeth; the two ends of the drive wheel pin (23) are respectively rotatably engaged with the positioning hole of the connecting seat (20) and the through hole of the cover plate (24), One end of the drive pin (23) is fixedly connected to the knob (21), and the other end is fixedly connected to the drive wheel (22). The drive pin (23) has an annular groove on its outer periphery. The sealing ring (27) is assembled in the groove to seal the gap between the drive pin (23) and the cover plate (24). The driven wheel assembly includes a driven wheel (25) and a driven pin (26). The driven wheel (25) has a mounting hole in its center, through which it is fixedly connected to the driven pin (26). The outer periphery of the driven wheel (25) is a straight structure or has anti-slip teeth. The driven pin (22) 26) The two ends are respectively rotated and engaged with the positioning hole of the connecting seat (20) and the blind hole of the cover plate (24). The passive wheel pin (26) is fixedly connected with the passive wheel (25), and the driving wheel (22) is arranged opposite to the passive wheel (25) and pre-pressed on the surface of the valve core (9). The knob (21) is fixedly connected with the end of the driving wheel pin (23) away from the driving wheel (22). Rotating the knob (21) can drive the driving wheel pin (23) and the driving wheel (22) to rotate synchronously. The valve core (9) is driven to move axially by the friction between the driving wheel (22) and the valve core (9).

13. The indwelling catheter with valve core according to claim 12, characterized in that: The connecting seat (20), driving wheel (22), driving wheel pin (23), cover plate (24), passive wheel (25), passive wheel pin (26), and knob (21) are made of polymer or metal materials.

14. The indwelling catheter with valve core according to claim 1, characterized in that: The drive device moves the valve core (9) through a telescopic drive structure. The inner wall of the drive device is provided with a protrusion (12.1) that engages with the valve core fixing seat (9.2). It includes a telescopic conduit (8.3). The telescopic conduit (8.3) is originally in an extended state. When it is compressed forward, it generates displacement and drives the valve core (9) to move to the outlet (2.1) of the conduit (2) to achieve sealing.

15. The indwelling catheter with valve core according to claim 14, characterized in that: It also includes a limiting plate (28), one end of which is rotatably connected to the driving device via a hinge (12.2), and the other end is used to limit the end of the telescopic conduit (8.3).

16. The indwelling catheter with valve core according to claim 1, characterized in that: When used for open indwelling needles, it also includes a first positioning sleeve (14), which is adapted to be installed on the inner side of the tail end of the catheter seat (3). The outer side of the tail end of the catheter seat (3) is connected to a vent plug seat (15) through a Luer cone. A vent plug (17) is installed at the end of the vent plug seat (15). A spiral cap (16) is installed on the outside of the vent plug (17). A second positioning sleeve (18) is installed on the outer side of the valve core (9) near the catheter seat (3). A fixing seat (19) is also installed at the tail end of the extension tube (8).

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