Anticoagulation device and remaining needle comprising same

Abstract

The invention discloses an anticoagulation device and an indwelling needle comprising the same. The anticoagulation device comprises an extension catheter, a four-way extension tube seat and a flow adjusting device, the first end of the extension catheter can be communicated to the puncture needle head; the four-way extension tube seat is provided with a first through hole tube, a second through hole tube, a third through hole tube and a fourth through hole tube which are communicated with one another; the first through hole tube is communicated to the second end of the extension catheter, the second through hole tube is in sealed connection with the elastic vesicle, the third through hole tube is in sealed connection with the heparin cap, and the fourth through hole tube is in sealed connection with the plugging end cap; the flow adjusting device is arranged on the extension catheter and used for controlling the flow of the infusion channel in the extension catheter. The continuous or declining state of the positive pressure is judged by observing the bulging and shrinking states of the elastic vesicles, the declining condition of the positive pressure can be visually and directly judged and recognized, and the state can be monitored at any time and processed in time. By arranging the heparin cap, thrombus is avoided.

Description

[0001] This application is a divisional application of application No. "202211139944.8" with a filing date of "September 19, 2022" and an invention name of "An anticoagulant device and an indwelling needle comprising the same". TECHNICAL FIELD

[0002] The present application relates to the technical field of medical devices, in particular to an anticoagulant device and an indwelling needle comprising the same. BACKGROUND

[0003] The use of indwelling needles can reduce the pain and fear of repeated venipuncture in patients, alleviate the anxiety of family members, facilitate clinical medication, rescue medication for critically ill patients, reduce the workload of nurses, and reduce patient pain, so that intravenous indwelling needles are widely used in clinical practice.

[0004] The intravenous indwelling needle in the prior art is pulled off after infusion is completed. Since the human body has a certain blood pressure, the catheter is in a negative pressure state, and blood will flow back to the catheter. Over time, platelet deposition will occur, thereby promoting thrombus formation, or the thrombus may enter the patient's body with the liquid medicine during the next infusion, causing unnecessary medical accidents.

[0005] Therefore, it is an urgent problem to invent a continuous positive pressure intravenous indwelling needle with an anticoagulant device that can visually and intuitively identify the positive pressure dissipation condition during clinical application to ensure the continuity and observability of continuous positive pressure thrombus prevention. SUMMARY

[0006] The purpose of the present application is to provide an anticoagulant device and an indwelling needle comprising the same, which can visually and intuitively identify the positive pressure dissipation condition to ensure the continuity and observability of continuous positive pressure thrombus prevention, and solve the technical problems that the pressure state of the intravenous indwelling needle cannot be effectively observed and thrombus enters the patient's body with the liquid medicine, causing medical accidents.

[0007] In order to achieve the above-mentioned purpose, one embodiment of the present application provides an anticoagulant device, comprising an extension catheter, a four-way extension tube seat and a flow regulating device; the first end of the extension catheter is capable of being communicated to a puncture needle; the four-way extension tube seat is provided with a first through hole tube, a second through hole tube, a third through hole tube and a fourth through hole tube which are communicated with each other; the first through hole tube is communicated to the second end of the extension catheter, the second through hole tube is sealedly connected with an elastic blister, the third through hole tube is sealedly connected with a heparin cap, and the fourth through hole tube is sealedly connected with a plugging end cap; the flow regulating device is arranged on the extension catheter and used for controlling the flow size of the infusion channel in the extension catheter. The flow regulating device comprises a sealing pipe switch valve connected to the extension conduit; the sealing pipe switch valve comprises a front cover and a rear cover coaxially rotatably connected, and an elastic washer is further arranged between the front cover and the rear cover; the front cover is provided with a center bayonet, a first conduit joint and a first infusion channel, and the first conduit joint is connected to the first infusion channel; the elastic washer is provided with a center hole, a small directional groove, a large directional groove and a micro flow groove, the small directional groove and the large directional groove are arranged on the outer side of the annular side wall of the elastic washer, and the micro flow groove is arranged on one surface of the elastic washer; the rear cover is provided with a center shaft lock, a second conduit joint, a small directional boss, a large directional boss and a second infusion channel, the second conduit joint is connected to the second infusion channel, and the small directional boss and the large directional boss are arranged on the inner side of the annular side wall of the rear cover; the center hole of the elastic washer is interference-fitted with the center shaft lock on the rear cover, the surface of the elastic washer provided with the micro flow groove is arranged towards the rear cover, and the small directional groove and the large directional groove on the elastic washer are gap-fitted and directionally assembled with the small directional boss and the large directional boss on the rear cover respectively; the rear cover can drive the elastic washer to rotate by rotating, and the first infusion channel and the second infusion channel are connected in communication when they are correspondingly arranged, otherwise they are closed.

[0008] Further, the transparent end cap is further fixed outside the elastic bubble, and the elastic bubble can be inflated and expanded or shrunk and deflated in the transparent end cap, so as to judge the positive pressure persistence or recession state by observing the expansion or deflation state of the elastic bubble in the transparent end cap.

[0009] Further, the second through-hole pipe is provided with a pipe mouth end face, and the outer surface of the second through-hole pipe is provided with a sealing ring adjacent to the position of the pipe mouth end face; the elastic bubble is provided with an elastic deformation sleeve, a first annular side wall and a second annular side wall, the first annular side wall is correspondingly arranged with the pipe mouth end face, and the second annular side wall is correspondingly arranged with the sealing ring; the transparent end cap is provided with a connecting part, an abutting boss and a transparent observation part; the diameter of the transparent observation part is smaller than the diameter of the connecting part, and the transparent observation part and the connecting part are connected through the abutting boss; the connecting part is connected with the outer surface of the second through-hole pipe, the transparent observation part is correspondingly arranged with the sealing ring adjacent to the inner side wall of the abutting boss, the second annular side wall and the sealing ring are interference-fitted to form an elastic linear seal, the first annular side wall is deformed to form a flat seal between the abutting boss and the pipe mouth end face, and the elastic deformation sleeve is arranged in the transparent observation part.

[0010] Further, the transparent observation part is provided with an exhaust hole.

[0011] The application also provides an indwelling needle comprising a puncture needle, a needle handle, a barrier plug, a catheter seat and the anticoagulation device described above; the needle handle is covered on the tail of the puncture needle; the barrier plug is arranged on the outer surface of the puncture needle and is arranged adjacent to the needle handle; the catheter seat is connected with the needle handle and is covered on the outer surface of the barrier plug and the middle part of the puncture needle; the catheter seat is provided with a bypass pipe connected to the puncture needle; and the bypass pipe is connected with the extension catheter in the anticoagulation device.

[0012] The application has the advantages that the anticoagulation device and the indwelling needle comprising the same are provided, the elastic bubble bag is arranged, the positive pressure is formed after the liquid medicine is filled in the elastic bubble bag, the positive pressure persistence or recession state is judged by observing the inflation or deflation state of the elastic bubble bag, the positive pressure recession condition can be directly judged and recognized visually, the state monitoring can be performed at any time and the state can be processed in time. The heparin cap is arranged to avoid the blood backflow caused by the micro-permeation formed when the flow adjusting device seals the tube, the blood accumulation formed in the flow adjusting device caused by the blood backflow and the thrombus. BRIEF DESCRIPTION OF DRAWINGS

[0013] The technical scheme and other advantages of the application will be presented by the following detailed description of the specific embodiments of the application in combination with the drawings.

[0014] Figure 1 The structure schematic diagram of the indwelling needle comprising the anticoagulation device provided by the embodiment of the application is shown.

[0015] Figure 2 The partial structure schematic diagram of the position of the four-way extension catheter seat provided by the embodiment of the application is shown.

[0016] Figure 3 The structure schematic diagram of the elastic bubble bag provided by the embodiment of the application is shown.

[0017] Figure 4 The structure schematic diagram of the transparent end cap provided by the embodiment of the application is shown.

[0018] Figure 5 The combined structure schematic diagram of the position of the four-way extension catheter seat provided by the embodiment of the application is shown.

[0019] Figure 6 The structure schematic diagram of the tube sealing clamp provided by the embodiment of the application is shown.

[0020] Figure 7 The structure schematic diagram of the tube sealing clamp arranged on the extension catheter provided by the embodiment of the application is shown.

[0021] Figure 8 The cross-sectional view of the tube sealing clamp arranged on the extension catheter provided by the embodiment of the application is shown.

[0022] Figure 9A cross-sectional view of the tube sealing clamp provided by an embodiment of the present application is clamped on the extension catheter.

[0023] Figure 10 A cross-sectional view of the tube sealing clamp provided by an embodiment of the present application is clamped on the extension catheter.

[0024] Figure 11 A structure schematic view of the tube sealing switch valve provided by an embodiment of the present application.

[0025] Figure 12 A structure schematic view of the front cover provided by an embodiment of the present application from one perspective.

[0026] Figure 13 A structure schematic view of the front cover provided by an embodiment of the present application from another perspective.

[0027] Figure 14 A structure schematic view of the elastic gasket provided by an embodiment of the present application from one perspective.

[0028] Figure 15 A structure schematic view of the elastic gasket provided by an embodiment of the present application from another perspective.

[0029] Figure 16 A structure schematic view of the rear cover provided by an embodiment of the present application from one perspective.

[0030] Figure 17 A structure schematic view of the rear cover provided by an embodiment of the present application from another perspective.

[0031] Figure 18 A structure schematic view of the two-way switch valve provided by an embodiment of the present application.

[0032] Figure 19 A cross-sectional view of the valve seat provided by an embodiment of the present application.

[0033] Figure 20 A structure schematic view of the valve inner shaft provided by an embodiment of the present application.

[0034] Figure 21 A structure schematic view of the two-way switch valve provided by an embodiment of the present application when opening the normal infusion.

[0035] Figure 22 A structure schematic view of the two-way switch valve provided by an embodiment of the present application when opening the micro-flow channel.

[0036] Figure 23 A structure schematic view of the indwelling needle provided by an embodiment of the present application when opening the full-open channel by the tube sealing clamp.

[0037] Figure 24 A structure schematic view of the indwelling needle provided by an embodiment of the present application when opening the micro-flow channel by the tube sealing clamp.

[0038] Figure 25 The structure schematic diagram of the indwelling needle provided by the embodiment of the present application is shown in the following figure.

[0039] Figure 26 The structure schematic diagram of the indwelling needle provided by the embodiment of the present application is shown in the following figure.

[0040] Figure 27 The structure schematic diagram of the indwelling needle provided by the embodiment of the present application is shown in the following figure.

[0041] Figure 28 The structure schematic diagram of the indwelling needle provided by the embodiment of the present application is shown in the following figure. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person skilled in the art without any creative work fall within the protection scope of the present application.

[0043] In the description of the present application, it should be understood that the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0044] In the description of the present application, it should be noted that, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] Specifically, please refer to Figure 1 The present application provides an anticoagulant device, which comprises an extension catheter 3, a four-way extension pipe seat 5 and a flow regulating device.

[0046] The first end of the extension catheter 3 can be communicated to the puncture needle 1; the four-way extension tube seat 5 is provided with a first through hole tube 5.1, a second through hole tube 5.2, a third through hole tube 5.3 and a fourth through hole tube 5.4 which are communicated with each other; the first through hole tube 5.1 is communicated to the second end of the extension catheter 3, the second through hole tube 5.2 is sealedly connected with the elastic bubble 6, the third through hole tube 5.3 is sealedly connected with the heparin cap 8, and the fourth through hole tube 5.4 is sealedly connected with the blocking end cap 9; the flow regulating device is arranged on the extension catheter 3 and is used for controlling the flow size of the infusion channel in the extension catheter 3.

[0047] The elastic bubble 6 is arranged in the embodiment of the application, and after the drug liquid fills the elastic bubble 6, the positive pressure is formed to expand; the positive pressure disappearance condition can be directly judged and recognized by visually judging the bulging and deflating state of the elastic bubble 6, the state can be monitored at any time and handled in time.

[0048] The heparin cap 8 simulates the effect of the Remington principle on the vein indwelling needle tube sealing, so as to reduce the medical expenses of patients and improve the work efficiency of nurses. The heparin cap 8 is matched with the artery and vein indwelling needle, can be repeatedly punctured for infusion, is used for injecting drugs, has a standard locking connector, and can prevent blood reflux and coagulation after injecting heparin sodium. The heparin cap 8 is arranged to avoid the blood reflux caused by the micro-permeation formed when the flow regulating device seals the tube and the blood thrombus caused by the blood accumulation in the flow regulating device.

[0049] Please refer to Figure 1 The elastic bubble 6 is further fixed with a transparent end cap 7 outside, the elastic bubble 6 can be inflated and bulged or deflated and shrunk in the transparent end cap 7, and the bulging and deflating state of the elastic bubble 6 in the transparent end cap 7 is used to judge the positive pressure persistence or disappearance state. The four-way extension tube seat 5, the elastic bubble and the transparent end cap connection assembly form a visual effect. The transparent end cap 7 forms a large cavity, can make the elastic bubble 6 expand and deform, and guarantees sufficient drug flow and continuous positive pressure time.

[0050] Please refer to Figures 2 to 5, the second through-hole pipe 5.2 is provided with a pipe mouth end face 5.2.2, and an outer surface of the second through-hole pipe 5.2 is provided with a sealing ring 5.2.1 adjacent to the pipe mouth end face 5.2.2; the elastic bubble 6 is provided with an elastic deformation sleeve 6.3, a first annular side wall 6.1 and a second annular side wall 6.2, the first annular side wall 6.1 is arranged correspondingly to the pipe mouth end face 5.2.2, and the second annular side wall 6.2 is arranged correspondingly to the sealing ring 5.2.1; the transparent end cap 7 is provided with a connecting part 7.4, an abutting boss 7.3 and a transparent observation part 7.1; a diameter of the transparent observation part 7.1 is smaller than that of the connecting part 7.4, and the transparent observation part 7.1 and the connecting part 7.4 are connected through the abutting boss 7.3; the connecting part 7.4 is connected through thread locking with an outer thread 5.2.3 of the outer surface of the second through-hole pipe 5.2, and the transparent observation part 7.1 is arranged correspondingly to the sealing ring 5.2.1 adjacent to an inner side wall 7.2 of the abutting boss 7.3, so that the second annular side wall 6.2 and the sealing ring 5.2.1 are in interference fit to form an elastic linear seal, the first annular side wall 6.1 is deformed to form a flat seal between the abutting boss 7.3 and the pipe mouth end face 5.2.2, and the elastic deformation sleeve 6.3 is arranged in the transparent observation part 7.1.

[0051] Further, the transparent observation part 7.1 is provided with an exhaust hole. The exhaust hole makes the exhaust smooth when the elastic bubble 6 swells in the transparent end cap 7, and the positive pressure persistence or recession state can be judged by observing the swelling and deflating state of the elastic bubble 6 in the transparent end cap 7.

[0052] Please refer to Figure 1 , Figure 6 , Figure 7 , the extension conduit 3 is a flexible pipe, and the flow adjusting device comprises a pipe clamping clamp 4, and the pipe clamping clamp 4 is clamped on the extension conduit 3; the pipe clamping clamp 4 is provided with a pipe clamping protrusion 11 and an elastic plug 12 arranged oppositely, the pipe clamping protrusion 11 is provided with a pipe clamping end face 4.1 facing the extension conduit 3, the elastic plug 12 is provided with a plug end face 12.1 facing the extension conduit 3, and the extension conduit 3 is clamped between the pipe clamping end face 4.1 and the plug end face 12.1.

[0053] The pipe clamping clamp 4 clamps the extension conduit 3 to prevent the flow of the medicinal liquid, the clamping part of the extension conduit 3 is in a micro-flow and micro-permeation state in a flexible clamping mode, and the required medicinal liquid flow amount in the extension conduit 3 is maintained.

[0054] Further, the pipe clamp end face 4.1 is provided with a plurality of tooth-shaped grooves arranged at equal intervals; or the pipe clamp end face 4.1 is provided with a plurality of circular-arc grooves arranged at equal intervals; or the pipe clamp end face 4.1 is provided with a plurality of trapezoidal grooves arranged at equal intervals. The various forms of the pipe clamp end face 4.1 ensure the required flow amount of the liquid medicine in the pipe.

[0055] As shown in Figure 8 , the plug end face 12.1 is a circular end face for accommodating the extension catheter 3; or as shown in Figure 9 , the plug end face 12.1 is an arc-shaped end face for accommodating the extension catheter 3; or as shown in Figure 10 , the plug end face 12.1 is a flat end face abutting against the extension catheter 3. The various forms of the plug end face 12.1 ensure the required flow amount of the liquid medicine in the pipe.

[0056] As shown in Figures 11 to 17As shown, the flow regulating device comprises a sealing pipe switch valve 13 connected to the extension pipe 3; the sealing pipe switch valve 13 comprises a front cover 13.1 and a rear cover 13.2 coaxially rotatably connected, and an elastic washer 13.3 is further arranged between the front cover 13.1 and the rear cover 13.2; the front cover 13.1 is provided with a center bayonet 13.1.1, a first pipe joint 13.1.2 and a first infusion channel 13.1.3, the first pipe joint 13.1.2 is connected to the first infusion channel 13.1.3; the elastic washer 13.3 is provided with a center hole 13.3.2, a small directional groove 13.3.1, a large directional groove 13.3.3 and a micro flow groove 13.3.4, the small directional groove 13.3.1 and the large directional groove 13.3.3 are arranged on the outside of the annular side wall of the elastic washer 13.3, and the micro flow groove 13.3.4 is arranged on one surface of the elastic washer 13.3; the rear cover 13.2 is provided with a center shaft lock 13.2.1, a second pipe joint 13.2.2, a small directional boss 13.2.3, a large directional boss 13.2.4 and a second infusion channel 13.2.5, the second pipe joint 13.2.2 is connected to the second infusion channel 13.2.5, and the small directional boss 13.2.3 and the large directional boss 13.2.4 are arranged on the inside of the annular side wall of the rear cover 13.2; the center hole 13.3.2 of the elastic washer 13.3 is interference-fitted with the center shaft lock 13.2.1 on the rear cover 13.2, the surface of the micro flow groove 13.3.4 of the elastic washer 13.3 is arranged towards the rear cover 13.2, and the small directional groove 13.3.1 and the large directional groove 13.3.3 on the elastic washer 13.3 are gap-fitted and directionally assembled with the small directional boss 13.2.3 and the large directional boss 13.2.4 on the rear cover 13.2 respectively; the rear cover 13.2 can drive the elastic washer 13.3 to rotate by rotating, when the first infusion channel 13.1.3 and the second infusion channel 13.2.5 are correspondingly arranged, the two are connected in communication, otherwise the two are closed.

[0057] The flow size of the infusion channel is controlled by rotating the rear cover 13.2 to adjust the distance of the micro flow groove 13.3.4 from the flow channel space; when the rear cover 13.2 is screwed to the bottom in the right direction, the first infusion channel 13.1.3 and the second infusion channel 13.2.5 are correspondingly arranged; when the rear cover 13.2 is screwed to the first infusion channel 13.1.3 and the second infusion channel 13.2.5 misaligned, the two are closed, i.e. the infusion micro flow state.

[0058] As Figures 18 to 22As shown, the flow regulating device includes a two-way switching valve 14, which is connected to the extension conduit 3. The two-way switching valve 14 includes a valve seat 14.1 and a valve inner shaft 14.2 rotatably disposed within the valve seat 14.1. The valve inner shaft 14.2 has a handle 14.2.1 at its top and a buckle 14.2.2 at its bottom. The valve inner shaft 14.2 extends into the middle of the valve seat 14.1 and has intersecting channels 14.2.3 and microflow channels 14.2.4. The diameter of the microflow channels 14.2.4 is smaller than that of the channels 14. The diameter is 2.3; the valve seat 14.1 is provided with two pipe joints 14.1.2 connected to the extension conduit 3, the upper surface of the valve seat 14.1 is provided with a stop 14.1.1 arranged around the valve inner shaft 14.2, the valve seat 14.1 is provided with a limiting ring 14.1.3 corresponding to the buckle 14.2.2, the buckle 14.2.2 has a taper and is interference-fitted with the limiting ring 14.1.3, and the two pipe joints 14.1.2 can be connected through the channel 14.2.3 or the microflow channel 14.2.4 by turning the handle 14.2.1.

[0059] The handle 14.2.1 is turned to set the connection status of the pipe joint 14.1.2 with the channel 14.2.3 and the micro-flow channel 14.2.4 respectively through the gear position 14.1.1, thereby limiting the flow space and controlling the flow rate of the infusion channel. Figure 21 The state is open when the handle 14.2.1 is parallel to the extension tube 3. Figure 22 The state is that the handle 14.2.1 is perpendicular to the extension catheter 3, which is the closed state, i.e., the state of infusion microflow.

[0060] like Figure 1 , Figures 23 to 28 As shown, this application also provides an indwelling needle suitable for veins or arteries. The indwelling needle includes a puncture needle 1, a needle handle 10, an isolation plug 11, a catheter seat 2, and the anticoagulant device described above; the needle handle 10 covers the tail of the puncture needle 1; the isolation plug 11 is disposed on the outer surface of the puncture needle 1 and adjacent to the needle handle 10; the catheter seat 2 is connected to the needle handle 10 and covers the isolation plug 11 and the outer surface of the middle part of the puncture needle 1; the catheter seat 2 is provided with a bypass tube communicating with the puncture needle 1; the bypass tube is connected to the extension catheter 3 in the anticoagulant device.

[0061] like Figure 23 , Figure 24 As shown, when the sealing clamp 4 is clamped in a microfluidic state, the pressure inside the indwelling needle is determined by observing the expansion and contraction of the elastic air bladder 6 to determine whether the pressure is in a positive pressure state or a receding state.

[0062] like Figure 25, Figure 26 As shown, the rear cover 13.2 of the rotatable sealing valve 13 can be turned to adjust the drug infusion flow rate. The pressure inside the indwelling needle can be judged by observing the expansion and collapse of the elastic air bladder 6.

[0063] like Figure 27 , Figure 28 As shown, the handle 14.2.1 of the rotatable sealing valve 14 can be used to adjust the drug infusion flow rate. The pressure inside the indwelling needle can be determined by observing the expansion and contraction of the elastic air bladder 6.

[0064] The beneficial effects of this invention are that it provides an anticoagulant device and an indwelling needle containing it. By setting an elastic vesicle 6, positive pressure is formed and the vesicle expands after the medication fills it. By observing the bulging and collapsing state of the elastic vesicle (6), the positive pressure can be visually judged and identified directly, allowing for real-time monitoring and timely handling. By setting a heparin cap 8, it avoids blood backflow caused by micro-permeability during the sealing of the flow regulating device, which can lead to blood accumulation and thrombus formation in the flow regulating device.

[0065] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0066] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An anticoagulant device, characterized in that, include: The first end of the extension catheter (3) is connected to the puncture needle (1). The four-way extension tube seat 5 is provided with a first through-hole tube (5.1), a second through-hole tube (5.2), a third through-hole tube (5.3) and a fourth through-hole tube (5.4) that are interconnected; the first through-hole tube (5.1) is connected to the second end of the extension catheter (3), the second through-hole tube (5.2) is sealed to the elastic vesicle (6), the third through-hole tube (5.3) is sealed to the heparin cap 8, and the fourth through-hole tube (5.4) is sealed to the sealing end cap (9); as well as A flow regulating device is installed on the extension catheter (3) to control the flow rate of the infusion channel within the extension catheter (3); The flow regulating device includes a sealing valve (13), which is connected to the extension conduit (3); The sealing valve (13) includes a front cover (13.1) and a rear cover (13.2) that can be rotatably connected coaxially, and an elastic washer (13.3) is provided between the front cover (13.1) and the rear cover (13.2). The front cover (13.1) is provided with a central bayonet (13.1.1), a first catheter connector (13.1.2) and a first infusion channel (13.1.3), wherein the first catheter connector (13.1.2) is connected to the first infusion channel (13.1.3); The elastic washer (13.3) is provided with a central hole (13.3.2), a small directional groove (13.3.1), a large directional groove (13.3.3), and a micro-flow groove (13.3.4). The small directional groove (13.3.1) and the large directional groove (13.3.3) are disposed on the outer side of the annular sidewall of the elastic washer (13.3), and the micro-flow groove (13.3.4) is disposed on one surface of the elastic washer (13.3). The rear cover (13.2) is provided with a central shaft lock (13.2.1), a second catheter connector (13.2.2), a small directional boss (13.2.3), a large directional boss (13.2.4), and a second infusion channel (13.2.5). The second catheter connector (13.2.2) is connected to the second infusion channel (13.2.5). The small directional boss (13.2.3) and the large directional boss (13.2.4) are located on the inner side of the annular sidewall of the rear cover (13.2). The center hole (13.3.2) of the elastic washer (13.3) and the center shaft latch on the rear cover (13.2) 13.2.1) Interference fit: The surface of the elastic washer (13.3) with the microfluidic groove (13.3.4) faces the rear cover (13.2), and the small directional groove (13.3.1) and large directional groove (13.3.3) on the elastic washer (13.3) are respectively clearance fit and oriented assembly with the small directional boss (13.2.3) and large directional boss (13.2.4) on the rear cover (13.2); by rotating the rear cover (13.2), the elastic washer (13.3) can be driven to rotate. When the first infusion channel (13.1.3) and the second infusion channel (13.2.5) are correspondingly set, the two are connected; otherwise, the two are closed.

2. The anticoagulant device according to claim 1, characterized in that, A transparent end cap (7) is fixed outside the elastic vesicle (6). The elastic vesicle (6) can expand and bulge or contract and deflate inside the transparent end cap (7) to determine the positive pressure status by observing the bulging or deflation state of the elastic vesicle (6) inside the transparent end cap (7).

3. The anticoagulant device according to claim 2, characterized in that, The second through-hole pipe (5.2) is provided with a pipe end face (5.2.2), and a sealing ring (5.2.1) is provided on the outer surface of the second through-hole pipe (5.2) near the pipe end face (5.2.2). The elastic vesicle (6) is provided with an elastic deformation sleeve (6.3), a first annular sidewall (6.1) and a second annular sidewall (6.2). The first annular sidewall (6.1) is correspondingly provided with the end face of the tube (5.2.2), and the second annular sidewall (6.2) is correspondingly provided with the sealing ring (5.2.1). The transparent end cap (7) is provided with a connecting part (7.4), an abutting boss (7.3) and a transparent observation part (7.1); the diameter of the transparent observation part (7.1) is smaller than the diameter of the connecting part (7.4), and the transparent observation part (7.1) and the connecting part (7.4) are connected by the abutting boss (7.3); The connecting part (7.4) is connected to the outer surface of the second through-hole pipe (5.2). The inner sidewall 7.2 of the transparent observation part (7.1) adjacent to the abutment boss (7.3) is correspondingly arranged with the sealing ring (5.2.1), so that the second annular sidewall (6.2) and the sealing ring (5.2.1) are interference-fitted to form an elastic linear seal. The first annular sidewall (6.1) is squeezed and deformed between the abutment boss (7.3) and the pipe end face (5.2.2) to form a planar seal. The elastic deformation sleeve (6.3) is placed inside the transparent observation part (7.1).

4. The anticoagulant device according to claim 3, characterized in that, The transparent observation section (7.1) is provided with an exhaust port.

5. An indwelling needle, characterized in that, include: Puncture needle (1); The needle handle (10) covers the tail of the puncture needle (1); An isolation plug (11) is disposed on the outer surface of the puncture needle (1) and adjacent to the needle handle (10); A catheter seat (2) is connected to the needle handle (10) and covers the outer surface of the middle part of the isolation plug (11) and the puncture needle (1); the catheter seat (2) is provided with a bypass tube communicating with the puncture needle (1); and The anticoagulation device according to any one of claims 1 to 4, wherein the bypass tube is connected to the extension catheter (3) in the anticoagulation device.

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