Medical connector assembly and venous indwelling device

Abstract

The invention relates to a medical connector assembly and a venous indwelling device, and belongs to the technical field of medical instruments. Comprising a first chamber and a second chamber which are not communicated with each other; the connecting end is screwed to the input end of the joint main body; the connecting end is provided with at least one input pipeline A and at least one input pipeline B; when the input pipeline B is located at a first axial position relative to the connecting end, the input pipeline A and the input pipeline B are in fluid communication with the first cavity; and when the input pipeline B is located at a second axial position relative to the connecting end, the input pipeline B is switched to be in fluid communication with the second cavity. The risk that the tube is disengaged when the needle head is detached is avoided, meanwhile, the hidden danger of occupational exposure of medical staff caused by the exposed needle head is also eliminated, and the safety and efficiency of clinical nursing are greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a medical connector assembly and an indwelling vein device. Background Technology

[0002] Indwelling intravenous catheters are a primary tool in clinical intravenous therapy, reducing patient discomfort from repeated punctures and lessening nurses' workload. To prevent blood backflow from causing catheter blockage, a positive pressure connector is typically attached to the end of the catheter.

[0003] Existing medical positive pressure connectors: For example, application number CN201620939165.X provides a continuous positive pressure connector, which provides a continuous positive pressure in the positive pressure chamber when the infusion set is removed, thus ensuring that blood does not flow back and form a thrombus; For example, application number CN201520233460.9 provides an integrated micro-resistance needleless anti-backflow positive pressure infusion connector, which can be adapted to different people and working environments.

[0004] However, the above-mentioned medical connector has the following problems when used: On the one hand, positive pressure connectors only have a single input port. However, in clinical settings such as ICUs, emergency rooms, or oncology departments, patients often require simultaneous infusion of multiple medications. Because the positive pressure connector has only one interface, healthcare workers must resort to workarounds to achieve multi-line infusion. Typically, a heparin cap is connected to the rear end of the positive pressure connector, and then multiple infusion needles are simultaneously inserted into the rubber stopper of the heparin cap. To prevent needle slippage, healthcare workers usually need to use tape to secure the needles. When one medication infusion is completed and the corresponding needle needs to be removed, the adhesive tape can easily cause other infusion needles to be accidentally pulled out or loosened, resulting in extravasation or interruption of the infusion. More seriously, in the chaotic process of removing the tape and removing the needles, exposed needles can easily prick the fingers of healthcare workers, posing a risk of occupational exposure and cross-infection.

[0005] On the other hand, for special drugs requiring precise dosage control (such as vasoactive drugs, insulin, and chemotherapy drugs), microinfusion pumps are often used clinically for administration. To achieve positive pressure sealing and prevent backflow, the valve core inside the positive pressure connector is typically held firmly by an elastic element, resulting in a high opening pressure. This high-resistance structure has little impact on large-volume infusions that rely on gravity, but it poses a significant obstacle for microinfusion pumps with extremely slow flow rates and limited thrust. The high opening pressure often causes the microinfusion pump to detect high pressure in the tubing, frequently triggering a blockage alarm and preventing normal infusion. Summary of the Invention

[0006] To address the aforementioned problems in the prior art, the present invention provides a medical connector assembly and a vein indwelling device.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A medical connector assembly is provided, comprising: The connector body has a first chamber and a second chamber that are not interconnected. Connect the end cap and screw it onto the input end of the connector body; The connection end has at least one input pipe A and at least one input pipe B; Furthermore, the input pipe B is movably disposed at the connection end and is capable of axial displacement relative to the connection end; When the input pipe B is in the first axial position relative to the connection end, the input pipe A and the input pipe B are in fluid communication with the first chamber; Furthermore, when the input pipe B is in the second axial position relative to the connection end, the input pipe B is switched to fluid communication with the second chamber; Furthermore, the first chamber is connected to the first output pipeline, the second chamber is connected to the second output pipeline, and the first output pipeline and the second output pipeline are coaxially connected and isolated from each other.

[0008] Preferably, it includes: A positive pressure piston structure, the positive pressure piston structure including a piston body capable of moving axially and an elastic element for resetting; The piston body is provided with a partition wall to define the first chamber and the second chamber inside the piston body; The inlet end of the first output pipe extends into the first chamber, and the outer wall of the first output pipe is in sliding sealing fit with the piston body; The inlet end of the second output pipe extends into the second chamber, and the outer wall of the second output pipe is in sliding sealing fit with the piston body.

[0009] Preferably, the top of the second chamber has an opening, and the opening is provided with an elastic sealing element; In the first axial position, the input pipe B does not abut against the elastic sealing member, and the elastic sealing member closes the opening; Furthermore, in the second axial position, the input conduit B passes through or pushes open the elastic seal, causing the elastic seal to open the opening to connect the input conduit B with the second chamber.

[0010] Preferably, the outer wall of the input pipe B is provided with an adjusting thread, and the connecting end is provided with a threaded mounting hole that mates with the adjusting thread; The input pipe B is configured to generate the axial displacement relative to the connection end by rotation; and the top end of the input pipe B is provided with an operating part for applying rotational torque.

[0011] Preferably, the connector body includes a housing and a base; The first output pipe and the second output pipe are integrally formed on the base and extend upward into the internal space of the outer shell; One end of the elastic element abuts against the base, and the other end abuts against the bottom surface of the piston body; The piston body has an upward reset tendency under the action of the elastic element, so as to close the input end of the connector body when the connection end is removed.

[0012] Preferably, the elastic sealing element is a self-sealing valve disposed on the piston body partition wall; In the first axial position, the end of the input pipe B is suspended above the self-sealing valve, which closes due to its own elasticity. In the second axial position, the end of the input pipe B is inserted into the opening and opens the self-sealing valve.

[0013] Preferably, the outer wall of the piston body is provided with an annular sealing portion; The inner wall surface of the connector body is provided with a sealing section; In the initial state, the annular sealing part abuts against the sealing section, blocking the flow path of the first chamber; When the connecting end is screwed into the connector body and the piston body is pushed down to the preset position, the annular sealing part moves away from the sealing section.

[0014] Preferably, the input pipe B or the connecting end is provided with a limiting structure; The limiting structure is used to limit the maximum stroke of the input pipe B relative to the connection end.

[0015] Preferably, the input pipe B has an identification structure for visually distinguishing the input pipe B from the input pipe A, or for indicating the current axial position of the input pipe B.

[0016] A venous indwelling device is provided, comprising: Indwelling needle; The medical connector assembly as described in any of the above technical solutions is connected to the indwelling needle.

[0017] This invention provides a medical connector assembly and an indwelling venous catheter device. The beneficial effects of this invention are as follows: This embodiment utilizes the axial displacement of the input line B to achieve a physical switch in the flow path. When the input line B is adjusted to the second axial position, it directly connects to the second chamber and outputs independently via the second output line, thus creating a physically isolated independent channel within the assembly. This allows the micro-pump medication to enter the body through a direct path formed by the input line B, without needing to overcome the high opening pressure or fluid resistance of the first chamber (involving the positive pressure valve mechanism of the connector body). This low-flow-resistance physical connection eliminates the micro-pump blockage problem caused by excessive back pressure, ensuring smooth pumping of high-precision medication.

[0018] Secondly, addressing the risks of needlestick injuries and catheter dislodgement during multi-pathway infusion, this embodiment integrates input tubing A and input tubing B at the connecting end, achieving multi-pathway input functionality on a single component. During clinical multi-drug infusions, medical staff no longer need to connect an additional heparin cap and use multiple needles for puncture and fixation; instead, they can directly connect different infusion lines using the multiple input interfaces of this component. This not only avoids the cumbersome operation of using tape to secure the needle but also fundamentally eliminates the risk of catheter dislodgement during needle removal. It also eliminates the occupational exposure (needlestick injury) hazard to medical staff caused by exposed needles, greatly improving the safety and efficiency of clinical nursing. Attached Figure Description

[0019] Figure 1 This is one of the existing medical positive pressure connectors; Figure 2 This is the second type of medical positive pressure connector in the existing technology; Figure 3 This is one of the cross-sectional views (initial state) of the medical connector assembly proposed in this invention. Figure 4 This is a second cross-sectional view (first axial position) of the medical connector assembly proposed in this invention. Figure 5 This is one of the cross-sectional views (second axial position) of the medical connector assembly proposed in this invention. Figure 6 for Figure 5 A magnified view of a portion at point A; Figure 7 This is a schematic diagram of the intravenous indwelling device proposed in this invention.

[0020] Figures 3 to 7 Explanation of reference numerals in the attached figures: 1. Connector body; 101. First chamber; 102. Second chamber; 103. Input end; 104. Outer shell; 105. Base; 2. Connecting end; 201. Input pipe A; 202. Input pipe B; 301. First output pipe; 302. Second output pipe; 401. Piston body; 402. Elastic element; 501. Opening; 502. Elastic sealing element; 601. Annular sealing part; 602. Sealing section; 7. Indwelling needle. Detailed Implementation

[0021] 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.

[0022] Please see Figures 1-7 As shown, the specific embodiments provided by the present invention are as follows: like Figures 1 to 6 As shown, embodiments of the present invention provide a medical connector assembly, the purpose of which is to solve the problems in the prior art (such as application number CN201620939165.X, see reference). Figure 1 For example, if the application number is CN201520233460.9, please refer to [the relevant documentation]. Figure 2 The single port problem of the positive pressure connector and the blockage problem of the micro pump.

[0023] The medical connector assembly mainly consists of two parts: the connector body 1 and the connecting end 2.

[0024] The internal space of the connector body 1 is divided into a first chamber 101 and a second chamber 102, which are structurally independent and not interconnected. To drain the liquid from the first chamber 101 and the second chamber 102, the first chamber 101 is connected to a first output pipe 301, and the second chamber 102 is connected to a second output pipe 302. Furthermore, the first output pipe 301 and the second output pipe 302 are coaxially connected, meaning one pipe is located inside the other, and they are isolated from each other, thus forming an independent outflow channel at the output end.

[0025] The connecting end 2 is installed on the input end 103 of the connector body 1, and the two are connected and fixed by screwing. The connecting end 2 is provided with an input pipeline for connecting to liquid, specifically including at least one input pipeline A201 and at least one input pipeline B202. The input pipeline A201 can be a fixedly installed channel or a channel formed on the connecting end 2.

[0026] Furthermore, the input conduit B202 is not statically fixed to the connection end 2, but is movably disposed on the connection end 2 and is configured to be able to undergo axial displacement relative to the connection end 2. This means that, through operation, the input conduit B202 can extend or move along the axial direction on the connection end 2, thereby changing its depth position inside the component.

[0027] Based on this mobility of the input conduit B202, the medical connector assembly has two different operating states, corresponding to two different axial positions of the input conduit B202 relative to the connecting end 2: like Figure 2 As shown, when the input pipe B202 is in the first axial position relative to the connecting end 2, the component is in the first connected state. In this state, liquid injected through both the input pipe A201 and the input pipe B202 will flow into the first chamber 101 of the connector body 1. At this time, both the input pipes A201 and B202 are in fluid communication with the first chamber 101, and the first chamber 101, as a common confluence space, guides the liquid to the first output pipe 301 for discharge.

[0028] like Figure 3 As shown, when the input pipe B202 is adjusted to displace relative to the connecting end 2 and reach the second axial position, the component switches to the second communication state. In this state, the communication path of the input pipe B202 changes; it is no longer connected to the first chamber 101, but instead switches to fluid communication with the second chamber 102 of the connector body 1. At this time, the liquid in the input pipe B202 will directly enter the second chamber 102 and be independently discharged through the second output pipe 302, thereby achieving the independence and isolation of the flow path of the input pipe B202.

[0029] Based on the above structure, the medical connector assembly of this embodiment can significantly solve the problems existing in the prior art: Firstly, addressing the issue of difficulty in pumping medication into the micro-infusion pump, this embodiment utilizes the axial displacement of the input line B202 to achieve a physical switch in the flow path. When the input line B202 is adjusted to the second axial position, it directly connects to the second chamber 102 and outputs independently via the second output line 302, thus creating a physically isolated independent channel within the assembly. This allows the micro-infusion pump medication to enter the body without overcoming the high opening pressure or fluid resistance of the first chamber 101 (involving the positive pressure valve mechanism of the connector body 1), instead entering through the direct path formed by the input line B202. This low-flow-resistance physical connection eliminates the micro-infusion pump blockage problem caused by excessive back pressure, ensuring smooth pumping of high-precision medication.

[0030] Secondly, addressing the risks of needlestick injuries and catheter dislodgement during multi-pathway infusion, this embodiment integrates input tubing A201 and input tubing B202 on the connecting end 2, achieving multi-pathway input functionality on a single component. During clinical multi-drug infusions, medical staff no longer need to connect an additional heparin cap and use multiple needles for puncture and fixation; instead, they can directly connect different infusion lines using the multiple input interfaces of this component. This not only avoids the cumbersome operation of using tape to secure the needle but also fundamentally eliminates the risk of catheter dislodgement during needle removal. It also eliminates the occupational exposure (needlestick injury) hazard to medical staff caused by exposed needles, greatly improving the safety and efficiency of clinical nursing.

[0031] In a preferred embodiment, the medical connector assembly further includes a positive pressure piston structure. This positive pressure piston structure mainly consists of a piston body 401 capable of reciprocating along the axial direction, and an elastic element 402 (e.g., a compression spring) for driving the piston body 401 to return to its original position.

[0032] Specifically, a partition wall is provided inside the piston body 401 to physically separate the internal space of the piston body 401 into two independent parts, which are respectively defined as the first chamber 101 and the second chamber 102. That is to say, in this embodiment, the first chamber 101 and the second chamber 102 are actually accommodating spaces located inside the piston body 401 and capable of moving with the piston body 401.

[0033] To drain the liquid from the two dynamic chambers and accommodate the axial movement of the piston body 401, the first output pipe 301 and the second output pipe 302 are fitted together with the piston body 401. Specifically, the inlet end of the first output pipe 301 extends upward and penetrates into the first chamber 101 inside the piston body 401, and a sliding seal is formed between the outer wall of the first output pipe 301 and the inner wall of the first chamber 101 (i.e., part of the inner wall of the piston body 401). Similarly, the inlet end of the second output pipe 302 also extends upward and penetrates into the second chamber 102 inside the piston body 401, and a sliding seal is also formed between the outer wall of the second output pipe 302 and the inner wall of the second chamber 102.

[0034] When the piston body 401 moves axially under the push of the connecting end 2 or under the reset action of the elastic element 402, the piston body 401 can slide along the outer wall of the fixed first output pipe 301 and second output pipe 302. During this process, the sliding seal ensures that the first chamber 101 and the second chamber 102 are always sealed and connected to the corresponding output pipes, which not only prevents liquid cross-flow between the two chambers, but also ensures the sealing reliability during piston movement.

[0035] In a preferred embodiment, the top entrance of the second chamber 102 is provided with an opening 501, and an elastic sealing member 502 is disposed at the opening 501.

[0036] Specifically, the working state of the elastic sealing element 502 is entirely controlled by the axial position of the input pipe B202: When the inlet pipe B202 is in the first axial position relative to the connection end 2, the end of the inlet pipe B202 is suspended above the elastic sealing member 502, without contacting the elastic sealing member 502 or applying sufficient opening pressure. At this time, the elastic sealing member 502 maintains a naturally closed state by relying on its own elastic restoring force, tightly sealing the opening 501 of the second chamber 102. This ensures that, in the first connection position, the liquid medicine in the first chamber 101 cannot enter the second chamber 102, thereby ensuring the sterility and isolation of the second chamber 102 when it is not in use.

[0037] When the input pipe B202 is adjusted to generate axial displacement and reach the second axial position, the end of the input pipe B202 moves downward and contacts the elastic seal 502. As the displacement continues, the rigid end of the input pipe B202 will physically pass through (for slit valves) or mechanically push open (for duckbill valves or check valves) the elastic seal 502. Through this mechanically forced opening, the closed state of the elastic seal 502 is broken, thereby establishing direct fluid communication between the input pipe B202 and the second chamber 102. At this time, the outer wall of the input pipe B202 usually forms a tight interference fit with the opened elastic seal 502 to prevent the liquid from flowing back into the first chamber 101.

[0038] In a preferred embodiment, the outer wall surface of the input pipe B202 is machined with adjusting threads (i.e., external threads), while a corresponding threaded mounting hole with internal threads is provided on the connecting end 2. The input pipe B202 passes through the threaded mounting hole and forms a threaded engagement with it. This structure utilizes the principle of helical transmission to convert the rotational motion of the input pipe B202 into linear motion along the axial direction.

[0039] To facilitate the application of force by medical personnel during clinical procedures, the top end of the input conduit B202 (i.e., the end furthest from the connector body 1) is also provided with an operating part for applying rotational torque. This operating part can be an enlarged knob, a wing structure, or a grip with an anti-slip texture.

[0040] In actual use, medical staff only need to pinch the operating part and rotate the infusion tubing B202 clockwise (or counterclockwise, depending on the thread direction) to control the depth of downward movement of the infusion tubing B202. This ensures that the infusion tubing B202 passes through the elastic sealing member 502 and is aligned with the second chamber 102, avoiding affecting the sealing effect due to excessive or shallow insertion; and relying on the friction between the threads, the infusion tubing B202 can stably maintain its current position after adjustment, and will not accidentally retract due to the hydraulic reaction force inside the tubing, thus ensuring the stability of independent infusion.

[0041] In a preferred embodiment, the connector body 1 is assembled from two parts: a housing 104 and a base 105. The housing 104 forms the main outline of the connector and the input end 103, while the base 105 is responsible for sealing the bottom of the housing 104 and providing pipeline support.

[0042] The first output pipe 301 and the second output pipe 302 can be integrally molded (e.g., integral injection molding) and directly manufactured onto the base 105. Furthermore, to achieve an automatic sealing function, an elastic element 402 (typically a medical-grade stainless steel coil spring) is provided between the base 105 and the piston body 401. The lower end of the elastic element 402 abuts against the base 105 (or a spring seat provided on the base 105), and the upper end abuts against the bottom surface of the piston body 401.

[0043] The elastic element 402 is in a pre-compressed state after assembly, thus continuously giving the piston body 401 an upward reset tendency. Its working principle is as follows: When the connecting end 2 is screwed in, it overcomes the elastic force of the elastic element 402 and pushes the piston body 401 downward, opening the flow path. When the infusion ends and the connecting end 2 is unscrewed and removed from the input end 103 of the connector body 1, the external force is removed, and the piston body 401 quickly rebounds upward under the restoring force of the elastic element 402 until its top tightly fills and seals the opening 501 of the input end 103 of the connector body 1. This reset action not only achieves automatic sealing of the connector, preventing external bacteria from entering, but also displaces the fluid in the tubing during the piston's upward movement, generating positive pressure at the catheter tip, effectively preventing blood backflow and thrombus formation.

[0044] In a preferred embodiment, the resilient sealing element 502 is configured as a self-sealing valve disposed on the partition wall of the piston body 401.

[0045] In one embodiment, the self-sealing valve is made of medical-grade silicone and can be in the form of a duckbill valve, a cross-cut valve, or a slotted valve.

[0046] In another embodiment, the self-sealing valve may be an elastic sealing plate structure with a torsion spring structure, with a pair of elastic sealing plate structures arranged opposite each other to form a door-like form.

[0047] The self-sealing valve automatically switches its operating state according to the axial position of the input pipeline B202: When the inlet pipe B202 is in the first axial position, the end of the inlet pipe B202 does not contact the self-sealing valve, but is suspended above the self-sealing valve, maintaining a certain axial distance between them. In this state, the self-sealing valve is not subjected to external force and relies on the elastic restoring force of the silicone material itself to maintain a naturally closed state. This closed state effectively cuts off the connection between the first chamber 101 and the second chamber 102 at this point, preventing the liquid medicine flowing into the first chamber 101 (from the inlet pipe A201 or B) from accidentally leaking into the second chamber 102, ensuring the isolation of the second chamber 102 in the non-independent infusion mode.

[0048] When independent infusion is required (e.g., via a micro-pump) and the inlet line B202 is adjusted to the second axial position, the rigid end of the inlet line B202 moves downward and directly inserts into the through hole in the partition wall of the piston body 401, physically opening the elastic valve or slit of the self-sealing valve. At this time, the self-sealing valve is forcibly opened, and the end of the inlet line B202 passes through the self-sealing valve into the second chamber 102 (or directly connects to the second outlet line 302). The elastic valve of the opened self-sealing valve, under its own rebound force, tightly wraps around the outer wall of the inlet line B202, forming an interference seal. This not only establishes a physical channel from the inlet line B202 to the second chamber 102 but also prevents the medication from flowing back into the first chamber 101 during infusion.

[0049] In a preferred embodiment, a protruding annular sealing portion 601 is provided around the outer side wall of the piston body 401. This annular sealing portion 601 is typically made of a material with good resilience (such as silicone) and can be integrally injection molded with the piston body 401, or it can be a separate O-ring fitted into a groove in the piston body 401. Correspondingly, on the inner wall surface of the connector body 1, a region is defined whose inner diameter matches that of the annular sealing portion 601 (typically slightly smaller than the outer diameter of the annular sealing portion 601 to form an interference fit); this region is referred to as the sealing section 602.

[0050] In the initial state (i.e., when the connecting end 2 is not connected or not screwed in), the piston body 401 is in a high-position reset state, supported by the bottom elastic element 402. At this time, the annular sealing part 601 on the piston body 401 is precisely aligned with and tightly fitted against the inner wall of the sealing section 602 of the connector body 1. The interference fit formed between the two constitutes a reliable sealing interface. When the medical staff screws the connecting end 2 into the input end 103 of the connector body 1, the connecting end 2 will press the piston body 401 downward. As the piston body 401 overcomes the resistance of the elastic element 402 and moves down to the preset position, the annular sealing part 601 on its outer wall will undergo axial displacement. When the sealing part moves downward and slides out of the range of the sealing section 602 (i.e., "away from the sealing section 602"), it will usually enter the preset expansion area, variable diameter section, or guide groove area below the connector body 1. As the space in this area increases, the annular sealing part 601 no longer forms a complete circumferential seal with the inner wall, thereby opening a physical gap or bypass channel on the side of the piston body 401. The drug can flow into the first chamber 101 through this physical gap or bypass channel and flow smoothly into the first output pipeline 301, thus realizing the conduction of the flow path.

[0051] In a preferred embodiment, to prevent damage to internal components due to excessive operation and to ensure accurate docking of the input pipe B202 with the second chamber 102, a limiting structure is provided on the input pipe B202 or the connecting end 2. This limiting structure limits the maximum stroke of the input pipe B202 relative to the connecting end 2, causing axial displacement.

[0052] Specifically, the limiting structure can be constructed as a radial flange (or limiting step) provided on the outer wall of the input pipeline B202, and a mating shoulder provided in the inner hole of the connecting end 2.

[0053] During the downward movement of the input pipe B202, when the end of the input pipe B202 passes through the elastic seal 502 and inserts into the second chamber 102 to a predetermined depth, the radial flange on the input pipe B202 physically abuts against the mating shoulder of the connecting end 2. This rigid mechanical obstruction prevents the input pipe B202 from moving further downward, thus limiting its maximum downward movement distance.

[0054] In a preferred embodiment, in order to further improve the safety and convenience of clinical operation and prevent medical staff from confusing the pipeline or misjudging the working status of the connector, the input pipeline B202 is specially provided with an identification structure.

[0055] First, the identification structure visually distinguishes between inlet tubing B202 and inlet tubing A201. Considering that inlet tubing B202 is a dedicated interface for microinfusion pumps with a special independent flow channel, while inlet tubing A201 is a conventional infusion interface, their clinical uses differ significantly. Therefore, the identification structure can be manifested by inlet tubing B202 being made of a different material than inlet tubing A201 (usually transparent or white), such as blue or green medical-grade plastic, or by coating the operating part of inlet tubing B202 with a prominent colored ring. This allows healthcare personnel to easily identify, even during busy nursing work, which tubing is the adjustable inlet tubing B202 used to connect to the microinfusion pump, thus preventing the mistaken connection of ordinary medication to the microinfusion pump channel or vice versa.

[0056] Secondly, the marking structure can be used to indicate the current axial position of the input conduit B202. Since the axial displacement of the input conduit B202 determines the connectivity of its internal flow channels, clear position feedback is crucial. The marking structure can be specifically constructed as etched or printed scale lines, position markers, or text markings on the outer wall of the input conduit B202. When the input conduit B202 is in the first axial position, a specific mark (such as a green ring) is fully exposed above the connection end 2, indicating to the operator that the current mode is normal. When the operator adjusts the input conduit B202 downwards to the second axial position, as it moves downwards, the mark gradually sinks into the mounting hole of the connection end 2 until it disappears, or a specific positioning scale line becomes flush with the upper surface of the connection end 2. Through this visual position reference, medical personnel can accurately determine whether the input conduit B202 has been adjusted to the correct position without relying on guesswork or memory, ensuring the reliability of flow channel switching.

[0057] like Figure 7 As shown, an embodiment of the present invention further provides a vein indwelling device, which includes an indwelling needle 7 assembly and a medical connector assembly as described in any of the foregoing embodiments.

[0058] The indwelling needle 7 assembly typically includes a soft catheter implanted in the human body, a catheter hub fixed to the end of the soft catheter, and an optional extension tube. The medical connector assembly is located at the flow path end of the indwelling needle 7 assembly (e.g., directly screwed onto the Luer connector of the catheter hub, or connected to the end interface of the extension tube), forming fluid communication with the indwelling needle 7.

[0059] In clinical applications, particularly for intensive care (ICU) or chemotherapy patients, this device allows healthcare professionals to flexibly switch between or simultaneously administer high-dose fluid resuscitation (via inlet line A201 into the first chamber 101) and high-precision micro-infusion pump infusion (via inlet line B202 independently connecting to the second chamber 102) without changing the indwelling needle 7 or frequently disconnecting the connection. This integration not only greatly simplifies bedside tubing management and reduces the risk of catheter-related bloodstream infections caused by repeated connection operations, but also ensures that emergency or high-risk medications can enter the patient's body through this indwelling venous device with minimal flow resistance.

[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A medical connector assembly, characterized in that, include: The connector body has a first chamber and a second chamber that are not interconnected. Connect the end cap and screw it onto the input end of the connector body; The connection end has at least one input pipe A and at least one input pipe B; Furthermore, the input pipe B is movably disposed at the connection end and is capable of axial displacement relative to the connection end; When the input pipe B is in the first axial position relative to the connection end, the input pipe A and the input pipe B are in fluid communication with the first chamber; Furthermore, when the input pipe B is in the second axial position relative to the connection end, the input pipe B is switched to fluid communication with the second chamber; Furthermore, the first chamber is connected to the first output pipeline, the second chamber is connected to the second output pipeline, and the first output pipeline and the second output pipeline are coaxially connected and isolated from each other.

2. The medical connector assembly according to claim 1, characterized in that, include: A positive pressure piston structure, the positive pressure piston structure including a piston body capable of moving axially and an elastic element for resetting; The piston body is provided with a partition wall to define the first chamber and the second chamber inside the piston body; The inlet end of the first output pipe extends into the first chamber, and the outer wall of the first output pipe is in sliding sealing fit with the piston body; The inlet end of the second output pipe extends into the second chamber, and the outer wall of the second output pipe is in sliding sealing fit with the piston body.

3. The medical connector assembly according to claim 2, characterized in that, The top of the second chamber has an opening, and the opening is provided with a resilient sealing element; In the first axial position, the input pipe B does not abut against the elastic sealing member, and the elastic sealing member closes the opening; Furthermore, in the second axial position, the input conduit B passes through or pushes open the elastic seal, causing the elastic seal to open the opening to connect the input conduit B with the second chamber.

4. The medical connector assembly according to claim 3, characterized in that, The outer wall of the input pipe B is provided with an adjusting thread, and the connection end is provided with a threaded mounting hole that mates with the adjusting thread; The input pipe B is configured to generate the axial displacement relative to the connection end by rotation; and the top end of the input pipe B is provided with an operating part for applying rotational torque.

5. The medical connector assembly according to claim 2, characterized in that, The connector body includes a housing and a base; The first output pipe and the second output pipe are integrally formed on the base and extend upward into the internal space of the outer shell; One end of the elastic element abuts against the base, and the other end abuts against the bottom surface of the piston body; The piston body has an upward reset tendency under the action of the elastic element, so as to close the input end of the connector body when the connection end is removed.

6. The medical connector assembly according to claim 3, characterized in that, The elastic sealing element is a self-sealing valve disposed on the piston body partition wall; In the first axial position, the end of the input pipe B is suspended above the self-sealing valve, which closes due to its own elasticity. In the second axial position, the end of the input pipe B is inserted into the opening and opens the self-sealing valve.

7. The medical connector assembly according to claim 2, characterized in that, The outer wall of the piston body is provided with an annular sealing part; The inner wall surface of the connector body is provided with a sealing section; In the initial state, the annular sealing part abuts against the sealing section, blocking the flow path of the first chamber; When the connecting end is screwed into the connector body and the piston body is pushed down to the preset position, the annular sealing part moves away from the sealing section.

8. The medical connector assembly according to claim 1, characterized in that, The input pipe B or the connection end is provided with a limiting structure; The limiting structure is used to limit the maximum stroke of the input pipe B relative to the connection end.

9. The medical connector assembly according to claim 1, characterized in that, The input pipe B has an identification structure that is used to visually distinguish the input pipe B from the input pipe A, or to indicate the current axial position of the input pipe B.

10. A venous indwelling device, characterized in that, include: Indwelling needle; The medical connector assembly as described in any one of claims 1 to 9 is in communication with the indwelling needle.

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