Pre-filled catheter flusher

Abstract

The utility model provides a pre-filled catheter flusher which comprises a liquid storage container 1, an injection head 3, a locking connector 6 and an elastic pressure valve 2, flushing liquid is stored in the liquid storage container 1, the injection head 3 is connected to the liquid storage container 1, the locking connector 6 is connected to the injection head 3, the elastic pressure valve 2 is connected between the injection head 3 and the locking connector 6, and one end of the injection head 3 is communicated with an inner cavity of the liquid storage container 1. The other end of the connecting rod is communicated with the inner cavity of the locking joint 6; a buffering mechanism 5 is arranged between the end, away from the injection head 3, of the locking connector 6 and the elastic pressure valve 2, the buffering mechanism 5 is an elastic component, when flushing fluid flows from the injection head 3 to the locking connector 6, the buffering mechanism 5 is compressed, and when the flushing fluid stops flowing, the buffering mechanism 5 is partially or completely restored to the original shape. And the flushing fluid is pushed to flow from the injection head 3 to the locking connector 6, so that the flushing fluid backflow caused by micro deformation of the elastic pressure valve 2 to one end of the liquid storage container 1 is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, concretely relates to the pre-filled catheter flusher for catheter flushing. BACKGROUND

[0002] The venous catheterization can reduce the pain and the fear of needle puncture caused by repeated venous puncture, alleviate the anxious mood of the patient, facilitate clinical medication, reduce the workload of the nurse, and reduce the pain of the patient, so the venous catheterization is widely used in the clinic. During the use cycle of the venous catheterization, the probability of catheter blockage is very high, and the main reason is the catheter blockage caused by thrombus. Serious catheter blockage will cause the loss of function of the placed catheter, and the catheter has to be pulled out in advance, which not only increases the workload of the medical staff, but also causes additional pain and economic burden to the patient. In order to avoid the above problems, the catheter needs to be flushed before and after each infusion, after the infusion of high viscosity flushing liquid, between two flushing liquids with compatibility contraindication, and during the periodic maintenance of the infusion interval. The most commonly used catheter flushing is a common syringe. When flushing, the nurse uses a disposable sterile syringe to aspirate physiological saline in a large package or an independent package to prepare a catheter sealing liquid. Since the catheter sealing liquid needs to be prepared in advance, the operation is complex, the risk of infection is high, and another way is to use a pre-filled catheter flusher. The existing pre-filled catheter flusher adopts a similar structure of a traditional syringe, and the rubber piston needs to be coated with silicone oil, which can cause high insoluble particle content in the flushing liquid. In addition, since the piston rod can move forward and backward, the open area in the backward pulling process can cause pollution. Patent (publication number CN 203802807 U) discloses a backflow prevention plastic ampoule for catheter sealing / flushing of a retention needle. The ampoule includes an ampoule body and a nipple part connected to the top of the ampoule body. The nipple part is in communication with the inside of the ampoule body, and the connection part of the nipple part and the ampoule body is provided with a one-way valve for one-way conduction of the nipple part. When the retention needle is sealed / flushed, the device can ensure that the flushing liquid can only flow out in one direction and cannot backflow, thereby preventing blood backflow. Compared with the existing pre-filled catheter flusher, the device does not need to be siliconized, but when the device stops sealing / flushing the retention needle, the ampoule body rebounds, a negative pressure is formed in the inside of the ampoule body, the one-way valve is still slightly deformed in the direction of one end of the ampoule body under the action of the negative pressure, and the flushing liquid backflows, so that the phenomenon of catheter blockage caused by blood backflow cannot be avoided. In addition, when it is necessary to confirm whether the retention needle is blocked by backflow, since the one-way valve of the above-mentioned device only allows the flushing liquid to flow out from the inside of the ampoule body, the needle tube cannot be identified whether it backflows by backflow.

[0003] Therefore, the technical personnel in the field urgently need to develop a pre-filled catheter flusher with simple structure and convenient operation, which can not only prevent the backflow of the flushing liquid when the retention needle is sealed / flushed, but also resist the slight deformation of the elastic pressure valve to cause the backflow of the flushing liquid when the sealing / flushing of the retention needle is stopped, and can identify whether the needle tube backflows by backflow. SUMMARY

[0004] The pre-filled catheter flusher has the advantages that the structure is simple, the operation is convenient, the backflow of the flushing liquid can be prevented when the catheter is sealed and flushed, the backflow of the flushing liquid caused by the slight deformation of the elastic pressure valve can be prevented when the sealing and flushing of the catheter is stopped, and the pre-filled catheter flusher can identify whether the needle tube is backfilled by back-pumping.

[0005] The pre-filled catheter flusher has the advantages that the structure is simple, the operation is convenient, the backflow of the flushing liquid can be prevented when the catheter is sealed and flushed, the backflow of the flushing liquid caused by the slight deformation of the elastic pressure valve can be prevented when the sealing and flushing of the catheter is stopped, and the pre-filled catheter flusher can identify whether the needle tube is backfilled by back-pumping.

[0006] In the embodiments of the present application, the buffer mechanism is a flexible part provided on the inner wall of the locking joint, such as a part of the inner wall made of elastic material. When the flushing liquid flows from the injection head to the locking joint, the flexible part is compressed. When the flushing liquid stops flowing, the flexible part partially or completely restores to its original state and pushes the flushing liquid to flow from the injection head to the locking joint, thereby resisting the slight deformation of the elastic pressure valve in the direction of the end of the liquid storage container, which causes the backflow of the flushing liquid. In another embodiment, the buffer mechanism is an elastic membrane provided on the inner wall of the locking joint and a first buffer cavity provided on the inner wall of the locking joint to limit the deformation of the elastic membrane. When the flushing liquid flows from the injection head to the locking joint, the elastic membrane is compressed, and the first buffer cavity buffers the compression deformation of the elastic membrane. When the flushing liquid stops flowing, the elastic membrane partially or completely restores to its original state and pushes the flushing liquid to flow from the injection head to the locking joint, thereby resisting the slight deformation of the elastic pressure valve in the direction of the end of the liquid storage container, which causes the backflow of the flushing liquid. In another embodiment, the buffer mechanism is an elastic protrusion provided on the inner wall of the locking joint. When the flushing liquid flows from the injection head to the locking joint, the elastic protrusion is compressed. When the flushing liquid stops flowing, the elastic protrusion partially or completely restores to its original state and pushes the flushing liquid to flow from the injection head to the locking joint, thereby resisting the slight deformation of the elastic pressure valve in the direction of the end of the liquid storage container, which causes the backflow of the flushing liquid. In another embodiment, the buffer mechanism is a non-enclosed air chamber provided on the inner wall of the locking joint. When the flushing liquid flows from the injection head to the locking joint, the air in the air chamber is compressed. When the flushing liquid stops flowing, the air in the air chamber partially or completely diffuses and pushes the flushing liquid to flow from the injection head to the locking joint, thereby resisting the slight deformation of the elastic pressure valve in the direction of the end of the liquid storage container, which causes the backflow of the flushing liquid.

[0007] The elastic pressure valve is a component that can implement pressure and has elastic deformation. The elastic pressure valve allows the flushing liquid to flow from the injection head to the outside while effectively preventing the backflow of the flushing liquid into the cavity of the container by elastic deformation. In the embodiments of the present application, the elastic pressure valve is duckbill-shaped, the elastic pressure valve is located at the end of the locking joint and is folded into a flat valve port, and the elastic pressure valve is located at the end of the injection head and is in a cylindrical shape. The outer periphery of the cylindrical opening is tightly pressed between the locking joint and the injection head. In another embodiment, the elastic pressure valve includes a valve seat and an elastic sheet, the valve seat is fixed between the locking joint and the injection head, the elastic sheet is fixed to the end of the valve seat close to the locking joint, and the valve seat is provided with a through hole allowing the flushing liquid to flow. In another embodiment, the elastic pressure valve is in the form of a diaphragm, the elastic pressure valve is provided with a crack, and the elastic pressure valve is tightly pressed between the locking joint and the injection head. However, those skilled in the art can know that other components with other shapes that can achieve the function of the elastic pressure valve can also be used in the present application.

[0008] The elastic pressure valve is provided with a resistance increasing mechanism between the elastic pressure valve and the injection head, and the resistance increasing mechanism can increase the resistance of the elastic pressure valve to open to the one end of the liquid storage container.

[0009] In the embodiments of the present application, the resistance increasing mechanism is a component that can limit the deformation space of the elastic pressure valve to the one end of the liquid storage container. In another embodiment, the resistance increasing mechanism is a component that can apply a force to the elastic pressure valve to resist the deformation of the elastic pressure valve.

[0010] In the embodiments of the present application, the resistance increasing mechanism is a hollow elastic sheet. In another embodiment, the resistance increasing mechanism is one or more elastic strips, preferably a plurality of elastic strips. In another embodiment, the resistance increasing mechanism is a component with a variable cross-sectional area. However, those skilled in the art can know that other components with other shapes that can achieve the resistance increasing function can also be used in the present application.

[0011] Preferably, the resistance increasing mechanism is a component with a variable cross-sectional area. Further preferably, the component with a variable cross-sectional area is a ring-shaped component, a semi-ring-shaped component or other irregular cross-sectional components.

[0012] The above-mentioned component with a variable cross-sectional area is an independent component fixedly connected to the inner periphery of the injection head, or the component with a variable cross-sectional area is a component integrally formed with the injection head.

[0013] When the pre-filled catheter flusher provided by the present application is used to seal and flush the indwelling needle, the resistance increasing mechanism of the flusher can increase the resistance of the elastic pressure valve to open to the one end of the liquid storage container, effectively preventing the backflow of the flushing liquid and avoiding the blockage of the catheter caused by the backflow of blood. When it is necessary to confirm whether the indwelling needle is blocked by backflow, the liquid storage container is stretched to form a negative pressure in the inner cavity thereof, and whether the flushing liquid backflows under the action of the negative pressure is judged, and then the backflow of blood is identified.

[0014] The locking connector is an independent component connected to the end of the injection head away from the liquid storage container, and the elastic pressure valve is compressed between the locking connector and the injection head.

[0015] The locking connector not only facilitates the connection of the pre-filled catheter flusher with the infusion connector, but also facilitates the compression and sealing of the elastic pressure valve in the injection head, so as to avoid the leakage of the flushing liquid along the connection between the elastic pressure valve and the injection head and the locking connector to the inner cavity of the container, and the leakage of the flushing liquid along the connection between the elastic pressure valve and the injection head and the locking connector.

[0016] The outer side wall of the locking connector is provided with an extrusion auxiliary component extending outward, which can assist the hand to extrude the liquid storage container to be compressed and deformed.

[0017] The pre-filled catheter flusher further comprises a sealing component, the sealing component is used for plugging the locking joint, preventing the flushing liquid in the container cavity from flowing out of the locking joint to the outside, the sealing component can be a sealing cap, and the sealing cap is in sealing connection with the locking joint; the sealing component is part of the locking joint, and a flat head is formed by heat sealing the end of the locking joint away from the injection head; the sealing component is a heat sealing film, and the heat sealing film is heat sealed with the end of the locking joint away from the injection head.

[0018] The locking joint wall has a shoulder portion, which facilitates the injection head to press and seal the elastic pressure valve at one end of the locking joint.

[0019] Preferably, the inner wall of the shoulder portion is provided with a limiting table extending to one end of the elastic pressure valve, and the elastic pressure valve is pressed between the limiting table and the injection head.

[0020] Further preferably, the inner wall of the shoulder portion inside the limiting table is further provided with a limiting protrusion extending to one end of the elastic pressure valve, and the elastic pressure valve is pressed between the limiting table, the limiting protrusion and the injection head.

[0021] In order to fully utilize the flushing liquid in the liquid storage container to seal and flush the catheter and to facilitate the test of whether blood returns, the liquid storage container can adopt a cavity with a variable volume, preferably a bellows that can stretch and contract in the longitudinal direction. In another embodiment, the liquid storage container is a squeezable liquid storage bag, and at least part of the wall of the liquid storage bag is elastic.

[0022] In order to facilitate the use of the operator, the diameter of the liquid storage container away from the injection head is greater than the diameter of the liquid storage container close to the injection head in the embodiment of the utility model. In another embodiment, a pull ring is arranged at the end of the liquid storage container away from the injection head to facilitate the force of the hand.

[0023] In the embodiment of the utility model, the liquid storage container is provided with a container port, and the injection head is fixedly connected with the container port and connected through threads, welding, adhesion and the like. In another embodiment, the injection head is part of the peripheral wall of the container port.

[0024] Advantages

[0025] Firstly, the pre-filled catheter flusher provided by the utility model is simple in structure compared with a traditional syringe, does not need to be siliconized, and effectively reduces the soluble particulate matter in the flushing liquid. In addition, the pre-filled catheter flusher provided by the utility model is provided with a buffer mechanism between the end of the locking joint away from the injection head and the elastic pressure valve, the buffer mechanism is a component with elasticity, the buffer mechanism is compressed when the flushing liquid flows from the injection head to the locking joint, and when the flushing liquid stops flowing, the buffer mechanism partially or completely restores to the original state and pushes the flushing liquid to flow from the injection head to the locking joint, thereby resisting the slight deformation of the elastic pressure valve in the direction of the end of the liquid storage container to cause the backflow of the flushing liquid.

[0026] Second, the pre-filled catheter flusher provided by the utility model sets a resistance increasing mechanism between the elastic pressure valve and the injection head, the resistance increasing mechanism can increase the resistance of the elastic pressure valve opening to the one end of the liquid storage container by limiting the deformation space of the elastic pressure valve to the one end of the liquid storage container or by applying a force against the deformation of the elastic pressure valve, effectively prevents the reflux of the flushing liquid, and avoids the catheter blockage caused by the blood reflux.

[0027] Third, the injection head of the utility model can be integrally formed with the liquid storage container, has few parts and simple structure; or the injection head can also be separately formed with the liquid storage container, facilitating product processing and manufacturing.

[0028] Fourth, the locking connector of the utility model not only facilitates the connection of the pre-filled catheter flusher and the infusion connector, but also is beneficial to the compression sealing of the elastic pressure valve in the injection head, guarantees that the flushing liquid is completely injected to the outside through the crack, avoids the sealing failure between the elastic pressure valve and the injection head and the locking connector, and causes the reflux of the flushing liquid to the inner cavity of the container along the connection between the elastic pressure valve and the injection head and the locking connector and the leakage of the flushing liquid along the connection between the elastic pressure valve and the injection head and the locking connector. The locking connector can be provided with a shoulder, the shoulder facilitates the compression sealing of the elastic pressure valve in one end of the locking connector, the inner wall of the shoulder can be provided with a limiting table, the limiting table enhances the sealing between the elastic pressure valve and the locking connector and the injection head through linear sealing. In order to further enhance the sealing between the elastic pressure valve and the locking connector and the injection head, the inner wall of the shoulder located inside the limiting table is provided with a limiting protrusion, realizing the double linear sealing of the limiting table and the limiting protrusion. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 : full disassembly view of the pre-filled catheter flusher of the utility model embodiment;

[0030] Figure 2 : full cross-sectional view of the pre-filled catheter flusher of the utility model embodiment;

[0031] Figure 3 : full cross-sectional view of the liquid storage container provided with a pull ring in the pre-filled catheter flusher of the utility model embodiment;

[0032] Figure 4 : full cross-sectional view of the liquid storage container in the pre-filled catheter flusher of the utility model embodiment;

[0033] Figure 5 : structure diagram of the air cavity chamber in the pre-filled catheter flusher of the utility model embodiment;

[0034] Figure 6 The structure diagram of the liquid storage container in the pre-filled catheter flusher is in the shape of a liquid storage bag;

[0035] Figure 7 The structure diagram of the cross-sectional area changing component in the pre-filled catheter flusher is in the shape of a ring;

[0036] Figure 8 The structure diagram of the cross-sectional area changing component in the pre-filled catheter flusher is in the shape of a semi-ring;

[0037] Figure 9 The structure diagram of the cross-sectional area changing component in the pre-filled catheter flusher is in the shape of an irregular shape;

[0038] Figure 10 The structure diagram of the pre-filled catheter flusher in the pre-filled catheter flusher is in the shape of a hollow elastic sheet;

[0039] Figure 11 The structure diagram of the pre-filled catheter flusher in the pre-filled catheter flusher is in the shape of an elastic strip;

[0040] Figure 12 The structure diagram of the pre-filled catheter flusher in the pre-filled catheter flusher is in the shape of a duckbill-shaped elastic pressure valve;

[0041] Figure 13 The structure diagram of the pre-filled catheter flusher in the pre-filled catheter flusher is in the shape of an elastic sheet and a valve seat cooperating structure.1. Liquid storage container; 10. Container port; 11. Container inner cavity; 12. Container side wall; 13. Container bottom wall; 2. Elastic pressure valve; 21. Crack; 22. Valve port; 23. Opening; 24. Valve seat; 241. Through hole; 25. Elastic sheet; 3. Injection head; 4. Resistance increasing mechanism; 41. Hollow elastic sheet; 42. Elastic strip; 43. Cross-sectional area changing component; 5. Buffer mechanism; 51. Elastic membrane; 52. First buffer cavity; 53. Elastic protrusion; 54. Air cavity; 541. Air cavity port; 6. Locking joint; 60. Joint inner cavity; 61. Joint side wall; 611. Extrusion auxiliary component; 62. Liquid inlet; 63. Liquid outlet; 64. Retaining ring; 641. Internal thread; 65. Shoulder; 651. Limiting table; 652. Limiting protrusion; 7. Pull ring; 8. Sealing component. DETAILED DESCRIPTION

[0042] The exemplary embodiments will be described in detail herein with reference to the accompanying drawings. In the following description, like reference numerals refer to like elements throughout the description. The following exemplary embodiments described herein represent illustrations only. They are not meant to be limiting in any respect. Rather, they are merely to exemplify apparatuses and methods consistent with some aspects of the present disclosure as set forth in the claims.

[0043] The utility model provides a pre -filled catheter flusher, below introduce the first embodiment of pre -filled catheter flusher that the utility model provides.

[0044] As Figure 1 As shown in a kind of pre-filled catheter flusher, the pre-filled catheter flusher includes liquid storage container 1, the injection head 3 of allowing flush liquid injection to outside and the elastic pressure valve 2 of preventing flush liquid backflow into the liquid storage container 1 inner cavity, which is pre-filled with flush liquid. The liquid storage container 1 is preferably telescopic bellows, made of medical plastic material blow molding, including container mouth 10, container side wall 12 and container bottom wall 13, the container side wall 12 and the container bottom wall 13 are enclosed to form container inner cavity 11, and the container inner cavity 11 is pre-filled with flush liquid. The injection head 3 is communicated with liquid storage container 1, and the injection head 3 is formed by the outer wall of the container mouth 10, which is integrally formed with the liquid storage container 1, has few components, simple structure and is sealed, not only easy to operate, but also simple assembly process, easy to realize mass production. In order to make full use of flush liquid in liquid storage container 1 to seal / flush pipe, the liquid storage container 1 is a bellows that can be telescoped along the longitudinal direction, and the container mouth 10 is arranged at the top end of the liquid storage container 1.

[0045] With reference to Figure 1 , in order to facilitate the device to be connected with infusion connector, the injection head 3 is sealingly fixed with locking connector 6, which is made of medical plastic material injection molding, and the locking connector 6 includes connector side wall 61, liquid inlet 62 and liquid outlet 63, the connector side wall 61 is enclosed to form connector inner cavity 60, the connector inner cavity 60 is provided with liquid inlet 62 at one end, which is communicated with the injection head 3, and is provided with liquid outlet 63 at the other end for flush liquid injection. The outer wall of the connector side wall 61 has a collar 64 extending to the end of the liquid outlet 63 along the axial direction of the locking connector 6, and the collar 64 is provided with internal threads 641 matched with the infusion connector.

[0046] With reference to Figure 1The elastic pressure valve 2 is a component that can apply pressure and has elastic deformation. The elastic pressure valve 2 allows the flushing liquid to flow from the injection head 3 to the outside through elastic deformation, and can also apply pressure to effectively prevent the flushing liquid from flowing back into the container cavity 11. The elastic pressure valve 2 is in the shape of a diaphragm and is made of medical silicone. The elastic pressure valve 2 is arranged between the locking joint 6 and the injection head 3. The elastic pressure valve 2 is provided with a crack 21. The crack 21 is in a straight, cross or T-shaped shape. In the natural state, it is in a closed state. When subjected to a certain pressure, the crack 21 is opened. In order to facilitate the elastic pressure valve 2 to be pressed and sealed to the injection head 3, the side wall 61 of the joint has a shoulder 65. The elastic pressure valve 2 is pressed and sealed between the shoulder 65 and the injection head 3. Furthermore, the inner wall of the shoulder 65 is provided with a limit platform 651 extending to one end of the elastic pressure valve 2. The limit platform 651 enhances the sealing between the elastic pressure valve 2 and the locking joint 6 and the injection head 3 through linear sealing. Furthermore, the inner wall of the shoulder 65, located inside the stop platform 651, is provided with a stop protrusion 652 extending to one end of the elastic pressure valve 2. The double linear seal of the stop platform 651 and the stop protrusion 652 further strengthens the sealing between the elastic pressure valve 2, the locking joint 6, and the injection head 3. The sealed connection between the outer periphery of the elastic pressure valve 2, the port of the injection head 3, and the locking joint 6 prevents flushing liquid from flowing back into the container cavity 11 along the connection between the outer periphery of the elastic pressure valve 2, the port of the injection head 3, and the locking joint 6, and prevents flushing liquid from leaking along the connection between the outer periphery of the elastic pressure valve 2, the port of the injection head 3, and the locking joint 6. Furthermore, a resistance-increasing mechanism 4 is provided between the elastic pressure valve 2 and the injection head 3, which increases the resistance of the elastic pressure valve 2 to opening toward one end of the liquid storage container 1. When injecting the flushing liquid, the liquid storage container 1 is squeezed by hand to be compressed and deformed. At this time, the pressure in the container cavity 11 increases, and the flushing liquid in the container cavity 11 is pushed to open the crack 21 of the elastic pressure valve 2, so that the flushing liquid flows from the container cavity 11 through the injection head 3 to the locking joint 6. When the injection of the flushing liquid is stopped, the liquid storage container 1 rebounds to form a negative pressure in its cavity. In order to prevent the elastic pressure valve 2 from deforming toward one end of the liquid storage container 1 under the action of negative pressure, the resistance-increasing mechanism 4 increases the resistance of the elastic pressure valve 2 to open toward one end of the liquid storage container 1, and prevents the elastic pressure valve 2 from deforming toward one end of the liquid storage container 1, thereby preventing the flushing liquid from flowing back, and further avoiding the phenomenon of blood backflow causing the catheter to be blocked. When it is necessary to confirm whether the catheter is blocked by backdrawing, the liquid storage container 1 is stretched to generate a negative pressure in its cavity. Under the action of the negative pressure, the elastic pressure valve 2 overcomes the resistance applied by the resistance-increasing mechanism 4 and opens toward one end of the liquid storage container 1. The flushing liquid backflow is used to identify whether the needle is bleeding, and further identify whether the needle is blocked. Figure 4As shown, in order to facilitate stretching the liquid storage container 1, the diameter of the liquid storage container 1 at the end far from the injection head 3 is greater than the diameter of the liquid storage container 1 at the end close to the injection head 3, which has the effect of assisting the hand force to stretch the liquid storage container 1. As shown in Figure 3 As shown, optionally, the liquid storage container 1 at the end far from the container port 10 is provided with a pull ring 7, which has the effect of assisting the hand force to stretch the liquid storage container 1.

[0047] As shown in Figure 6 Optionally, the liquid storage container 1 is a squeezable liquid storage bag. When the wall of the liquid storage container 1 is at least partially elastic, when it is necessary to confirm whether the needle tube is blocked by backflow, the elastic part of the liquid storage container 1 is stretched outward to generate negative pressure in the inner cavity, under the action of the negative pressure, the elastic pressure valve 2 overcomes the resistance exerted by the resistance increasing mechanism 4 and opens in the direction of the end of the liquid storage container 1, and the backflow of the flushing liquid is used to identify whether the needle tube is blocked by blood, and further identify whether the needle tube is blocked.

[0048] In this embodiment, the resistance increasing mechanism 4 can also be selected as other mechanical structures, as long as it can increase the resistance of the elastic pressure valve 2 to open in the direction of the end of the liquid storage container 1.

[0049] Continuing to refer to Figure 1 , the resistance increasing mechanism 4 can exert a force against the deformation of the elastic pressure valve 2, and increase the resistance of the elastic pressure valve 2 to open in the direction of the end of the liquid storage container 1. As shown in Figure 10 Specifically, the resistance increasing mechanism 4 is a hollow elastic sheet 41 provided between the elastic pressure valve 2 and the injection head 3, which is made of medical silicone material, and the hollow elastic sheet 41 is attached to the elastic pressure valve 2 at the end of the liquid storage container 1. The hollow elastic sheet 41 exerts a force against the deformation of the elastic pressure valve 2, and the outer periphery of the hollow elastic sheet 41 is fixedly connected to the inner periphery of the port of the injection head 3. When the flushing liquid is injected, the flushing liquid flows through the hollow elastic sheet 41 to open the crack 21 of the elastic pressure valve 2, so that the flushing liquid flows from the inner cavity 11 of the container to the locking connector 6 through the injection head 3. When the injection of the flushing liquid is stopped, the hollow elastic sheet 41 increases the resistance of the elastic pressure valve 2 to open in the direction of the end of the liquid storage container 1, and prevents the elastic pressure valve 2 from deforming in the direction of the end of the liquid storage container 1, thereby preventing the backflow of the flushing liquid and avoiding the phenomenon of catheter blockage caused by the backflow of blood. Further, the elasticity of the hollow elastic sheet 41 is greater than the elasticity of the elastic pressure valve 2, which effectively increases the resistance of the elastic pressure valve 2 to open in the direction of the end of the liquid storage container 1; or the hardness of the hollow elastic sheet 41 is greater than the hardness of the elastic pressure valve 2, which also effectively increases the resistance of the elastic pressure valve 2 to open in the direction of the end of the liquid storage container 1.

[0050] As shown in Figure 2 and Figure 11As shown, optionally, the resistance increasing mechanism 4 is an elastic strip 42 provided between the elastic pressure valve 2 and the injection head 3. The elastic strip 42 is a single strip, and the elastic strip 42 is in contact with the elastic pressure valve 2 at one end of the liquid storage container 1. The elastic strip 42 applies a force to resist the deformation of the elastic pressure valve 2, increases the resistance of the elastic pressure valve 2 to opening toward the end of the liquid storage container 1, and prevents the elastic pressure valve 2 from deforming toward the end of the liquid storage container 1, thereby preventing the backflow of the flushing liquid, and further preventing the backflow of blood from causing the catheter to be blocked. Preferably, the resistance increasing mechanism 4 is a plurality of elastic strips 42, and the elastic strips 42 are arranged crosswise, transversely spaced, or longitudinally spaced. The elastic strips 42 apply a force to resist the deformation of the elastic pressure valve 2, increases the resistance of the elastic pressure valve 2 to opening toward the end of the liquid storage container 1, and prevents the elastic pressure valve 2 from deforming toward the end of the liquid storage container 1, thereby preventing the backflow of the flushing liquid, and further preventing the backflow of blood from causing the catheter to be blocked.

[0051] like Figure 6 As shown, optionally, since the elastic pressure valve 2 needs space to deform during the opening process, the larger the space, the easier it is to deform, and the smaller the force required to open it. Therefore, the boosting mechanism 4 can increase the resistance of the elastic one-way valve 2 to opening toward one end of the liquid storage container 1 by limiting the space for the elastic one-way valve 2 to deform toward one end of the liquid storage container 1. Figure 7 As shown, specifically, the resistance increasing mechanism 4 is a component 43 with a changing cross-sectional area provided between the elastic pressure valve 2 and the injection head 3, and the component 43 with a changing cross-sectional area is provided on the inner side of the port of the injection head 3, and the component 43 with a changing cross-sectional area fits the elastic pressure valve 2 at one end of the liquid storage container 1, and the component 43 with a changing cross-sectional area is fixedly connected to the inner side of the port of the injection head 3, and the component 43 with a changing cross-sectional area is an annular component, and the component 43 with a changing cross-sectional area limits the space for the elastic pressure valve 2 to deform toward one end of the liquid storage container 1, and increases the resistance of the elastic pressure valve 2 to open toward one end of the liquid storage container 1, thereby preventing the backflow of the flushing liquid and avoiding the phenomenon of blood backflow leading to catheter blockage. Furthermore, the component 43 with a changing cross-sectional area is integrally formed with the injection head 3, and has a simple structure, is easy to implement, and reduces product production costs. As shown Figure 8 and Figure 9 As shown, optionally, the component 43 with a changing cross-sectional area may also be a semi-annular component or other irregular cross-sectional components, as long as the space for the elastic pressure valve 2 to deform toward one end of the liquid storage container 1 can be reduced.

[0052] When the injection of the flushing liquid is stopped, the reservoir 1 is reset to form a negative pressure in the inner cavity 11 of the reservoir, at this time the elastic pressure valve 2 is still subject to the negative pressure to cause a slight deformation in the direction of the end of the reservoir 1. In order to resist the slight deformation of the elastic pressure valve 2 in the direction of the end of the reservoir 1 to cause the backflow of the flushing liquid, the device further comprises a buffer mechanism 5 located on the joint side wall 61 between the liquid outlet 63 of the locking joint 6 and the elastic pressure valve 2, the buffer mechanism 5 is a flexible part provided on the inner wall of the locking joint 6, and the flexible part is made of an elastic material. When the flushing liquid is injected, the flushing liquid flows from the injection head 3 to the locking joint 6, and the flexible part is compressed by the flushing liquid; when the injection of the flushing liquid is stopped, the reservoir 1 is reset to form a negative pressure in the inner cavity 11 of the reservoir, and the flexible part is restored to the original state by relying on the elasticity of the flexible part and the negative pressure in the inner cavity 11 of the reservoir, and the flushing liquid is pushed to flow from the injection head 3 to the locking joint 6, thereby preventing the backflow of the flushing liquid, and further avoiding the phenomenon that the blood backflow causes the catheter to be blocked.

[0053] As shown in Figure 12 , optionally, the elastic pressure valve 2 of the device is in the shape of a duckbill, the elastic pressure valve 2 is located at the valve port 22 in the flat shape at one end of the locking joint 6, and the elastic pressure valve 2 is located at the cylindrical opening 23 in the shape of a barrel at one end of the injection head 3, and the outer periphery of the cylindrical opening 23 is tightly sealed between the locking joint 6 and the injection head 3. When the flushing liquid is injected, the reservoir 1 is squeezed by hand to be compressed and deformed, at this time the pressure in the inner cavity 11 of the reservoir is increased, and the flushing liquid in the inner cavity 11 of the reservoir pushes open the valve port 22 of the elastic pressure valve 2 to flow from the inner cavity 11 of the reservoir to the locking joint 6; when the injection of the flushing liquid is stopped, the valve port 22 of the elastic pressure valve 2 is closed by relying on the elasticity of the elastic pressure valve 2, which effectively prevents the backflow of the flushing liquid and avoids the phenomenon that the blood backflow causes the catheter to be blocked.

[0054] As shown in Figure 13 , optionally, the elastic pressure valve 2 of the device comprises a valve seat 24 and an elastic sheet 25, the valve seat 24 is tightly sealed between the locking joint 6 and the injection head 3, the elastic sheet 25 is fixed to one end of the valve seat 24 close to the locking joint 6, and the valve seat 24 is provided with a through hole 241 allowing the flushing liquid to pass through. When the flushing liquid is injected, the reservoir 1 is squeezed by hand to be compressed and deformed, at this time the pressure in the inner cavity 11 of the reservoir is increased, and the flushing liquid in the inner cavity 11 of the reservoir pushes open the elastic sheet 25 through the through hole 241 to flow from the inner cavity 11 of the reservoir to the locking joint 6; when the injection of the flushing liquid is stopped, the elastic sheet 25 is rebounded to be attached to the valve seat 24 by relying on the elasticity of the elastic sheet 25, which prevents the backflow of the flushing liquid by plugging the through hole 241, and avoids the phenomenon that the blood backflow causes the catheter to be blocked.

[0055] Continued with reference to Figure 1The outer wall of the joint side wall 61 has an outwardly extending extrusion auxiliary part 611 near the middle position, which is used to assist the hand to extrude the liquid storage container 1 away from the container bottom wall 13 of the injection head 3 end, and then extrude the flushing liquid in the container cavity 11 from the locking joint 6.

[0056] Continuing to refer to Figure 2 , the device further comprises a sealing part 8 for plugging the locking joint 6 to prevent the flushing liquid in the container cavity 11 from leaking from the locking joint 6 before use of the device. Optionally, the sealing part 8 is a sealing cap in sealing connection with the locking joint 6; or, continuing to refer to Figure 6 , the sealing part 8 is part of the locking joint 6, and the locking joint 6 is heat-sealed to form a flat head at the end away from the injection head 3; or, continuing to refer to Figure 1 , the sealing part 8 is a heat-sealed film heat-sealed to the end of the locking joint 6 away from the injection head 3. The sealing part 8 shown in the above Figure 1 、 Figure 2 and Figure 6 is only a schematic diagram, and in actual use, the sealing part 8 needs to be removed from the locking joint 6.

[0057] Referring to Figure 1 , the second embodiment of the flushing syringe provided by the utility model has basically the same structure as the first embodiment, and the difference between the two is that:

[0058] As shown in Figure 1 , the buffer mechanism 5 is provided with an elastic film 51 on the inner wall of the joint side wall 61 and a first buffer cavity 52 for the deformation of the elastic film 51 on the inner wall of the joint side wall 61. The elastic film 51 is made of elastic material. When the flushing liquid is injected, the flushing liquid flows from the injection head 3 to the locking joint 6, and the elastic film 51 is compressed by the extrusion of the flushing liquid. At this time, the first buffer cavity 52 buffers the compression deformation of the elastic film 51; when the injection of the flushing liquid is stopped, the liquid storage container 1 is reset to form a negative pressure in the container cavity 11, and the elastic film 51 restores to its original state by its own elasticity and the negative pressure in the container cavity 11, and pushes the flushing liquid to flow from the injection head 3 to the locking joint 6, thereby preventing the backflow of the flushing liquid and avoiding the phenomenon of catheter blockage caused by the backflow of blood.

[0059] Referring to Figure 2 , the third embodiment of the flushing syringe provided by the utility model has basically the same structure as the first embodiment, and the difference between the two is that:

[0060] As shown in Figure 2As shown, the buffer mechanism 5 comprises an elastic protrusion 53 provided on the inner wall of the connector side wall 61. The elastic protrusion 53 is made of an elastic material. When the flushing fluid is injected, the flushing fluid flows from the injection head 3 toward the locking connector 6, and the elastic protrusion 53 is compressed by the flushing fluid. When the flushing fluid injection stops, the liquid storage container 1 returns to its original position, creating a negative pressure in the container cavity 11. The elastic protrusion 53, relying on its own elasticity and the negative pressure in the container cavity 11, partially or completely returns to its original shape, simultaneously pushing the flushing fluid from the injection head 3 toward the locking connector 6, thereby preventing backflow of the flushing fluid and avoiding blood backflow that could cause catheter blockage.

[0061] refer to Figure 5 As shown, the fourth embodiment of the flushing syringe provided by the present invention has basically the same structure as the first embodiment, and the difference between the two is that:

[0062] like Figure 5 As shown, the buffer mechanism 5 is an air chamber 54 provided on the inner wall of the connector side wall 61. The air chamber 54 is enclosed by the elastic pressure valve 2 and the groove formed between the limit platform 651 and the limit protrusion 652. The air chamber 54 is provided with an air chamber opening 541 that communicates with the connector inner cavity 60. Air is reserved in the air chamber 54. When the flushing liquid is injected, the flushing liquid flows from the injection head 3 toward the locking connector 6, and the air in the air chamber 54 is squeezed and compressed by the flushing liquid. When the flushing liquid injection stops, the liquid storage container 1 is reset to form a negative pressure in the container inner cavity 11. The air in the air chamber 54 partially or completely diffuses due to its repulsive force and the negative pressure of the container inner cavity 11, and pushes the flushing liquid from the injection head 3 toward the locking connector 6, thereby preventing the flushing liquid from flowing back and thus avoiding the phenomenon of blood backflow causing catheter blockage. Preferably, the air chamber 54 has a gas passage with a constant inner diameter located at one end of the air cavity opening 541, and the inner diameter of the gas passage is 1 mm to 3 mm, ensuring that the flushing liquid can completely block the air cavity opening 541 and compress the gas in the air chamber 54 along the gas passage, effectively preventing the air reserved in the air chamber 54 from being compressed and discharged, thereby ensuring sufficient air diffusion to push the flushing liquid to flow from the injection head 3 to the locking joint 6.

[0063] It should be understood that the above-described specific embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the scope of protection of the present invention. In addition, the appended claims of the present invention are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A prefilled catheter flusher comprising: A liquid storage container (1) capable of storing flushing liquid, an injection head (3) connected to the liquid storage container (1), a locking joint (6) connected to the injection head (3), and an elastic pressure valve (2) connected between the injection head (3) and the locking joint (6), wherein one end of the injection head (3) is connected to the inner cavity of the liquid storage container (1), and the other end is connected to the inner cavity of the locking joint (6); characterized in that a buffer mechanism (5) is provided between the end of the locking joint (6) away from the injection head (3) and the elastic pressure valve (2), and the buffer mechanism (5) is an elastic component, and when the flushing liquid flows from the injection head (3) to the locking joint (6), the buffer mechanism (5) is compressed; when the flushing liquid stops flowing, the buffer mechanism (5) partially or completely returns to its original state.

2. The prefilled catheter flusher according to claim 1, characterized in that The buffer mechanism (5) is an elastic portion provided on the inner wall of the locking joint (6); or, the buffer mechanism (5) is an elastic membrane (51) provided on the inner wall of the locking joint (6), and a first buffer cavity (52) for deformation of the buffer elastic membrane (51) provided on the inner wall of the locking joint (6); or, the buffer mechanism (5) is an elastic protrusion (53) provided on the inner wall of the locking joint (6); or, the buffer mechanism (5) is a non-enclosed air chamber (54) provided on the inner wall of the locking joint (6).

3. The prefilled catheter flusher according to claim 1 or 2, characterized in that: The elastic pressure valve (2) is in a duckbill shape, and is located at a valve opening (22) that is flattened at one end of the locking joint (6). The elastic pressure valve (2) is located at a cylindrical opening (23) at one end of the injection head (3), and the outer periphery of the cylindrical opening (23) is pressed tightly between the locking joint (6) and the injection head (3); or, the elastic pressure valve (2) includes a valve seat (24) and an elastic sheet (25), and the valve seat (24) is fixed between the locking joint (6) and the injection head (3), and the elastic sheet (25) is fixed to one end of the valve seat (24) close to the locking joint (6), and the valve seat (24) is provided with a through hole (241) that allows the flushing liquid to flow; or, the elastic pressure valve (2) is in a diaphragm shape, and is provided with a crack (21), and the elastic pressure valve (2) is pressed tightly between the locking joint (6) and the injection head (3).

4. The prefilled catheter flusher according to claim 1 or 2, characterized in that: A resistance increasing mechanism (4) is provided between the elastic pressure valve (2) and the injection head (3), and the resistance increasing mechanism (4) increases the resistance of the elastic pressure valve (2) when it opens toward one end of the liquid storage container (1).

5. The prefilled catheter flusher according to claim 4, characterized in that The resistance increasing mechanism (4) limits the deformation space of the elastic pressure valve (2) toward one end of the liquid storage container (1); or, the resistance increasing mechanism (4) applies a force to the elastic pressure valve (2) to resist the deformation of the elastic pressure valve (2).

6. The prefilled catheter flusher according to claim 5, characterized in that The resistance increasing mechanism (4) is a hollow elastic sheet (41); or, the resistance increasing mechanism (4) is an elastic strip (42); or, the resistance increasing mechanism (4) is a component (43) with a variable cross-sectional area.

7. The prefilled catheter flusher according to claim 6, characterized in that The resistance increasing mechanism (4) is a component (43) with a variable cross-sectional area.

8. The prefilled catheter flusher according to claim 7, characterized in that The component (43) with a changing cross-sectional area is an annular component, a semi-annular component or a component with an irregular cross-sectional shape.

9. The prefilled catheter flusher according to any one of claims 6 to 8, characterized in that: The component (43) with a changing cross-sectional area is an independent component fixedly connected to the injection head (3); or, the component (43) with a changing cross-sectional area is a component integrally formed with the injection head (3).

10. The prefilled catheter flusher according to any one of claims 1-2 and 5-8, characterized in that: The locking joint (6) wall has a shoulder (65), and the elastic pressure valve (2) is compressed between the shoulder (65) and the injection head (3).

11. The prefilled catheter flusher according to claim 10, wherein: The inner wall of the shoulder (65) is provided with a limiting platform (651) extending to one end of the elastic pressure valve (2), and the elastic pressure valve (2) is pressed tightly between the limiting platform (651) and the injection head (3).

12. The prefilled catheter flusher according to claim 11, wherein: The inner wall of the shoulder (65) located inside the limiting platform (651) is also provided with a limiting protrusion (652) extending to one end of the elastic pressure valve (2), and the elastic pressure valve (2) is pressed between the limiting platform (651), the limiting protrusion (652) and the injection head (3).

13. The prefilled catheter flusher according to any one of claims 1-2, 5-8, 11, and 12, characterized in that: The outer side wall of the locking joint (6) is provided with an outwardly extending extrusion auxiliary component (611).

14. The prefilled catheter flusher according to any one of claims 1-2, 5-8, 11, and 12, characterized in that: It also comprises a sealing component (8), and the sealing component (8) is used to seal the locking joint (6).

15. The prefilled catheter flusher according to any one of claims 1-2, 5-8, 11, and 12, characterized in that: The volume of the liquid storage container (1) can be changed.

16. The prefilled catheter flusher according to any one of claims 1-2, 5-8, 11, and 12, characterized in that: The liquid storage container (1) is a bellows that can be expanded and contracted along the longitudinal direction; or, the liquid storage container (1) is a liquid storage bag that can be squeezed and deformed.

17. The prefilled catheter flusher according to any one of claims 1-2, 5-8, 11, and 12, characterized in that: The diameter of the end of the liquid storage container (1) away from the injection head (3) is larger than the diameter of the end close to the injection head (3); or, the end of the liquid storage container (1) away from the injection head (3) is provided with a pull ring (7) for facilitating hand force application.

18. The prefilled catheter flusher according to any one of claims 1-2, 5-8, 11, and 12, characterized in that: The liquid storage container (1) is provided with a container opening (10), and the injection head (3) is fixedly connected to the container opening (10); or, the injection head (3) is an extension of the peripheral wall of the container opening (10).

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