CN215460961U - Pre-filled syringe - Google Patents

Abstract

The utility model provides a charging type injector which comprises a liquid storage container 1 and a one-way valve 2, wherein the liquid storage container 1 is provided with an injection port 10, the one-way valve 2 is arranged at one end of the injection port 10 of the liquid storage container 1, the one-way valve 2 comprises a valve body 21 and a flow blocking part 22, the valve body 21 is of a cylindrical structure with one closed end and the other open end, the open end of the valve body 21 is fixed or formed on the inner wall of the liquid storage container 1, the side wall of the valve body 21 is provided with at least one first liquid flow port 211, and the flow blocking part 22 covers the first liquid flow port 211.

Description

Pre-filled syringe

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a prefilled syringe for catheter flushing.

Background

The vein catheterization can reduce the pain of the patient caused by repeated venipuncture and the fear of the puncture, reduce the anxiety of the patient, facilitate clinical medication, help the critical patient to rescue the patient, reduce the workload of nurses and reduce the pain of the patient, so the vein catheterization is widely applied in clinic. In the using period of the vein catheterization, the probability of catheter blockage is high, wherein the catheter blockage is mainly caused by thrombus, the function of the placed catheter is lost due to serious catheter blockage, and the catheter has to be pulled out in advance, so that the labor intensity of medical personnel is increased, and extra pain and economic burden are caused to a patient. At present, the flushing pipe is clinically needed before and after each transfusion, after the high-viscosity flushing liquid is infused, between two flushing liquids with incompatibility and during the periodical maintenance of the intermittent transfusion period. The most common catheter flushing is a common syringe which comprises a syringe barrel, an injection needle, a piston rod and a rubber piston, wherein flushing liquid is pre-filled in the syringe barrel, the end part of the piston rod is fixedly provided with the rubber piston, and the piston rod pushes the rubber piston to freely slide in the syringe barrel. When the common syringe is applied to catheter flushing, a plurality of defects exist: 1. when the piston rod pushes the rubber piston to the bottom of the injection tube, blood flows back into the cavity of the catheter due to the rebound of the rubber piston, and the catheter is blocked; 2. the rubber piston is extruded by the inner wall of the injection tube for a long time, and the rubber piston can generate elastic fatigue, so that the sealing property between the rubber piston and the inner wall of the injection tube is reduced, and the problems of leakage of flushing liquid and pollution of the flushing liquid exist; 3. the common injector has complex integral structure, more parts, inconvenient operation and higher manufacturing cost, and can bring larger economic burden to patients.

Therefore, there is a need for a prefilled syringe that has a simple structure, is easy to operate, is inexpensive to manufacture, and is reliable in use.

Disclosure of Invention

The utility model provides a pre-filled syringe which has simple structure, convenient operation, lower cost and reliable use.

The present invention provides a prefilled syringe comprising: the injection device comprises a liquid storage container and a one-way valve, wherein the liquid storage container is provided with an injection port, and the one-way valve is arranged at one end of the injection port of the liquid storage container; the check valve includes valve body and choked flow part, the valve body is one end and seals, other end open-ended tubular structure, the open end of valve body fixed or be formed at stock solution container inner wall, the valve body lateral wall are provided with at least one first liquid circulation mouth, choked flow part cover in first liquid circulation mouth for prevent that the flush fluid from flowing back extremely stock solution container.

Preferably, the valve body is of a cylindrical structure or a conical head cylindrical structure with one closed end and an open other end, the valve body is arranged upright, the closed end of the valve body is close to or exceeds the injection port, the open end of the valve body is far away from the injection port and is sealed and fixed or formed on the inner wall of the liquid storage container, the first liquid circulation port is formed in the side wall of the valve body, and the flow resisting part covers the outer side wall of the valve body.

Preferably, the valve body is a cone-shaped structure with one closed end and an open other end, the valve body is vertically arranged, the closed end of the valve body is close to or exceeds the injection port, the open end of the valve body is far away from the injection port and is hermetically fixed on the inner wall of the liquid storage container, the first liquid circulation port is formed in the cone wall of the valve body, and the flow resisting part covers the outer side of the cone wall of the valve body.

Preferably, the valve body is of a cylindrical structure or a conical head cylindrical structure with one end closed and the other end open, the valve body is arranged in an inverted mode, the open end of the valve body is close to the injection port and is hermetically fixed on the inner wall of the liquid storage container, the closed end of the valve body is far away from the injection port, the first liquid circulation port is formed in the side wall of the valve body, and the flow resisting part covers the inner side wall of the valve body.

Preferably, the valve body is a cone-shaped structure with one closed end and an open other end, the valve body is arranged in an inverted manner, the open end of the valve body is close to the injection port and is hermetically fixed on the inner wall of the liquid storage container, the closed end of the valve body is far away from the injection port, the first liquid circulation port is formed in the cone wall of the valve body, and the flow resisting part covers the inner side of the cone wall of the valve body.

Preferably, the wall thickness of the flow resisting part at the end close to the injection port is larger than that at the end far away from the injection port.

Preferably, the flow resisting part is in a diaphragm shape, and the flow resisting part is partially fixed on the periphery of the first liquid flow opening on the outer wall of the valve body; or the flow resisting part is annular and is sleeved on the outer wall of the valve body.

Preferably, the flow resisting part is in a diaphragm shape, and the flow resisting part is partially fixed on the periphery of the first liquid flow opening on the inner wall of the valve body; or the flow resisting part is annular and is sleeved on the inner wall of the valve body.

Preferably, the number of the first liquid circulation ports is two, and the first liquid circulation ports are symmetrically distributed on the side wall of the valve body; or, the first liquid circulation port is provided in plurality, and is uniformly distributed on the side wall of the valve body by taking the axis of the valve body as the center.

Preferably, the volume of the reservoir is compressible.

Preferably, the reservoir is a bellows that is compressible in a longitudinal direction; or the liquid storage container is a corrugated pipe capable of being compressed along the transverse direction; or the liquid storage container is a flexible container capable of being extruded and deformed.

Preferably, the outer side wall of the injection port of the liquid storage container extends outwards to form a locking joint matched with the positive pressure joint; or a locking joint is fixed on the injection port of the liquid storage container in a sealing manner.

A prefilled syringe, comprising: the locking device comprises a liquid storage container, a locking joint and a one-way valve, wherein the liquid storage container is provided with an injection port, and the locking joint is arranged at one end of the injection port of the liquid storage container; the check valve set up in the locking joint, the check valve includes valve body and choked flow part, the valve body is one end closed, other end open-ended tubular structure, the open end of valve body sealed fixed or be formed at the locking joint inner wall, the valve body lateral wall are provided with at least one first liquid circulation mouth, choked flow part cover in first liquid circulation mouth for prevent that the flush fluid from flowing back extremely the stock solution container.

Preferably, the outer side wall of one end of the injection port of the liquid storage container or the outer side wall of the locking joint is provided with a force application part.

A prefilled syringe, comprising: the injection device comprises a liquid storage container and a one-way valve, wherein the liquid storage container is provided with an injection port, and the one-way valve is arranged at one end of the injection port of the liquid storage container; the check valve includes valve body and choked flow part, the valve body is the disk form, the peripheral sealed fixed of valve body or be formed at stock solution container inner wall, the valve body is provided with at least one first liquid circulation mouth, choked flow part cover in first liquid circulation mouth is close to injection port one side for prevent that the flush fluid from flowing back extremely stock solution container.

Advantageous effects

First, the one-way valve of the prefilled syringe of the present invention can prevent the flushing fluid from flowing back to the inner cavity of the reservoir, and can prevent the compressed portion of the reservoir from rebounding, which causes the blood to flow back into the catheter cavity, resulting in the blockage of the catheter.

Secondly, the one-way valve has various forms, can be arranged at one end of the liquid storage container close to the injection port, has larger structural design space and is convenient to manufacture; or the one-way valve can be arranged in the locking joint, so that the locking joint has the advantages of few parts, simple structure, simple assembly process and low manufacturing cost.

Thirdly, the one-way valve can be in various specific shapes, the valve body can be in a disc-shaped structure, and one end of the valve body, which is close to the injection port, is covered with a sheet-shaped flow resisting part; or, the valve body can be a conical head cylindrical structure, and the side wall of the valve body is sleeved with an annular flow resisting part; or the valve body can be in a cone-shaped structure, the cone wall of the valve body is sleeved with an annular flow resisting part and the like, and the shape of the one-way valve can be flexibly designed according to specific use requirements.

Fourthly, the first liquid circulation port is formed in the end, far away from the injection port, of the valve body, the wall thickness of the flow blocking part covering the first liquid circulation port is thinned at the end, far away from the injection port, of the valve body, so that flushing liquid is injected from the end, far away from the injection port, of the check valve, and further gas remained between the outer side wall of the valve body and the inner wall of the liquid storage container is fully and thoroughly discharged, and therefore the clinical effect of the flushing liquid flushing guide pipe cannot be influenced.

Fifthly, at least part of the container wall of the liquid storage container is a corrugated container wall capable of stretching, namely the corrugated container wall is squeezed by hands to be compressed and deformed, so that the volume of the inner cavity of the liquid storage container is changed, and then flushing liquid in the inner cavity of the liquid storage container is injected to flush the catheter; or at least part of the container wall of the liquid storage container is a flexible container wall capable of being extruded and deformed, namely the flexible container wall is extruded by hands to be extruded and deformed, so that the volume of the inner cavity of the liquid storage container is changed, and then the flushing liquid in the inner cavity of the liquid storage container is injected to flush the catheter. The pre-filled syringe can be integrally formed, has few parts, extremely simple structure, easy operation, simple assembly process, low manufacturing cost, easy realization of batch production, and is airtight, and the problems of poor sealing, leakage of flushing fluid and pollution of the flushing fluid cannot occur.

Sixthly, the liquid storage container is provided with the force application part which is convenient to hold by a hand, the force application part has enough strength, can be prevented from being extruded and deformed by the hand, and is convenient to hold by the hand and connected with the locking joint.

Seventh, the locking joint of the present invention has an auxiliary pressing member for assisting the hand to press the liquid storage container, and the auxiliary pressing member can assist the hand to press the liquid storage container to be compressed and deformed.

Drawings

FIG. 1: the full-section exploded view of the prefilled syringe in the first embodiment of the utility model;

FIG. 2: the full section view of the prefilled syringe of the first embodiment of the present invention;

FIG. 3: the prefilled syringe of the first embodiment of the present invention is connected with a full sectional view of a sealing member;

FIG. 4: the half section view of the one-way valve in the prefilled syringe of the first embodiment of the present invention;

FIG. 5: a full sectional view of the prefilled syringe according to the second embodiment of the present invention;

FIG. 6: the prefilled syringe of the third embodiment of the present invention is connected with a full sectional view of the sealing member;

FIG. 7: the prefilled syringe of the third embodiment of the present invention is heat-sealed with a full sectional view of the sealing member;

FIG. 8: a full sectional view of the prefilled syringe according to the fourth embodiment of the present invention;

FIG. 9: in the prefilled syringe of the fourth embodiment of the present invention, the liquid storage container is a structure diagram of a bellows-shaped bellows;

FIG. 10: the one-way valve of the prefilled syringe is positioned in a full sectional view in the locking joint;

FIG. 11: the liquid storage container in the prefilled syringe disclosed by the embodiment of the utility model is a full sectional view of the flexible bag body.

1. A reservoir; 10. an injection port; 11. a container inner cavity; 111. a container neck; 12. a container sidewall; 13. a container bottom wall; 14. a force application member; 141. an annular reinforcing rib; 142. a reinforcing member; 143. axial reinforcing ribs; 15. a container wall; 2. a one-way valve; 21. a valve body; 210. a valve body chamber; 211. a first liquid flow port; 212. a second liquid flow port; 213. a valve body side wall; 2131. the valve body is clamped and convex; a valve body top wall 214; 215. a valve body cavity wall; 216. a tip; 22. a flow-impeding component; 3. locking the joint; 31. an infusion tube; 310. the inner cavity of the infusion tube; 311. a liquid inlet; 312. a liquid outlet; 313. a side wall of the infusion tube; 3131. an infusion tube clamping groove; 32. a collar; 321. an internal thread; 33. an extrusion auxiliary member; 4. a sealing member; 5. a seal ring; 6. a limiting groove.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the claims.

The present invention provides a prefilled syringe, and a first embodiment of the prefilled syringe provided by the present invention is described below.

As shown in fig. 1, a prefilled syringe includes a reservoir 1 whose inner cavity is prefilled with a washing solution, and a check valve 2 for preventing the washing solution from flowing back to the inner cavity of the reservoir 1. The reservoir 1 is preferably a compressible bellows, comprising a reservoir side wall 12 and a reservoir bottom wall 13, which reservoir side wall 12 and reservoir bottom wall 13 enclose a reservoir interior 11, which reservoir interior 11 is prefilled with an irrigation liquid. One end of the liquid storage container 1 is provided with an injection port 10 for injecting the flushing liquid, and the one-way valve 2 is arranged in the injection port 10. In order to prevent the liquid storage container 1 from being distorted in the compression process, the outer diameter of the corrugated pipe is gradually increased or decreased from one end far away from the injection port 10 to one end close to the injection port 10, and the liquid storage container 1 is made of medical plastic materials through blow molding. Check valve 2 includes valve body 21 and choked flow part 22, valve body 21 adopts the medical plastics material to mould plastics and makes, and valve body 21 is one end closed, other end open-ended tubular structure, and valve body 21 just sets up immediately, and the open end of valve body 21 is sealed fixed or be formed with 1 inner wall of stock solution container, the lateral wall of valve body 21 are provided with at least one first liquid circulation mouth 211, choked flow part 22 adopts medical rubber or silica gel material to make, and choked flow part 22 covers in first liquid circulation mouth 211, this check valve 2 can allow the flush fluid of container inner chamber 11 to inject from injection port 10, prevents simultaneously that the flush fluid from flowing back to container inner chamber 11 to and prevent that stock solution container 1 from being rebound by the compression part, lead to blood to flowing back in the pipe intracavity, the phenomenon of pipe jam appears. Specifically, the valve body 21 is a conical-head cylindrical structure, the valve body 21 has a cylindrical valve body side wall 213, a conical valve body top wall 214 and a second liquid flow port 212, the conical valve body top wall 214 is a closed end of the valve body 21, and the second liquid flow port 212 is an open end of the valve body 21. The valve body side wall 213 and the valve body top wall 214 enclose a valve body chamber 210, the valve body side wall 213 being provided with at least one first liquid flow opening 211 extending through the valve body side wall 213. The conical valve body top wall 214 is disposed adjacent to the injection port 10, and the conical valve body top wall 214 reduces the resistance to the flow of the flushing fluid, facilitating the flow of the flushing fluid from the first fluid communication port 211 to the injection port 10. The second fluid passage 212 is far away from the injection port 10 and is hermetically fixed on the inner wall of the liquid storage container 1, and the second fluid passage 212 is communicated with the first fluid passage 211 through the valve body cavity 210. The first liquid circulation port 211 is covered with a flow blocking part 22 for preventing the flushing liquid from flowing back to the container inner cavity 11, the flow blocking part 22 is annular, and the flow blocking part 22 is sleeved outside the valve body side wall 213. The valve body side wall 213 is provided with a limiting groove 6 which limits the flow resisting part 22 on the outer side of the valve body side wall 213, so that the phenomena of washing liquid backflow and rebound of a compressed part of the liquid storage container 1 caused by the fact that the flow resisting part 22 slips due to loose connection are avoided. In addition, the depth of the limiting groove 6 is greater than the thickness of the choke part 22, so that the limiting groove 6 has enough space to allow the choke part 22 to expand outwards, and further, a sufficient gap is left between the choke part 22 and the valve body side wall 213 after the limiting groove is opened to allow the flushing liquid to flow out. When the prefilled flushing liquid needs to be injected, the liquid storage container 1 is squeezed by hand to be compressed and deformed, at this time, the pressure in the container inner cavity 11 is increased, and the flushing liquid in the container inner cavity 11 is pushed to open the flow blocking part 22 covering the first liquid through hole 211, so that the flushing liquid flows from the first liquid through hole 211 to the injection port 10. The outer side wall of the valve body 21 is connected with the inner wall of the liquid storage container 1 in a sealing mode through the sealing ring 5, and the problems that flushing liquid is not easy to leak in a sealing mode and the pollution of the flushing liquid is effectively avoided. The outer wall of the valve body side wall 213 is provided with a valve body clamping protrusion 2131 protruding outwards, the inner wall of the liquid storage container 1 is provided with an inward-recessed container clamping groove 111, and the problem that the one-way valve 2 falls off due to insecure connection is effectively solved by mutually clamping the valve body clamping protrusion 2131 and the container clamping groove 111. After the injection of the flushing liquid, the compressed and deformed liquid storage container 1 gradually extends by the elasticity of itself, at the moment, a negative pressure is formed in the container inner cavity 11, and the flow blocking part 22 is tightly attached to the outer side of the valve body side wall 213 under the action of negative pressure suction, so that the flushing liquid is prevented from flowing back to the container inner cavity 11. The liquid storage container 1 is a corrugated tube which can be compressed along the longitudinal direction. Specifically, the end of the liquid storage container 1 far from the injection port 10 is pressed by hand in the direction close to the end of the injection port 10, so that the container side wall 12 is compressed and deformed, and the container inner cavity 11 is pressed to inject the flushing liquid through the second liquid flow port 212, the valve body cavity 210, the first liquid flow port 211 and the injection port 10 in sequence.

As shown in fig. 1, a locking joint 3 is hermetically fixed to an injection port 10 of the liquid storage container 1, the locking joint 3 is made of medical plastic by injection molding, and the locking joint 3 includes an infusion tube 31 passing through the hollow cavity and a collar 32 disposed outside the infusion tube 31. Specifically, the infusion tube 31 has a flared infusion tube sidewall 313, the infusion tube sidewall 313 encloses to form an infusion tube inner cavity 310, one end of the infusion tube inner cavity 310 is provided with a liquid inlet 311 communicated with the injection port 10, and the other end is provided with a liquid outlet 312 for injecting the flushing liquid. The outer wall of the infusion tube 31 is provided with a collar 32 extending to the end of the liquid outlet 312 along the axial direction of the infusion tube 31, and an internal thread 321 matched with the positive pressure joint is arranged in the collar 32.

As shown in fig. 2, the one-way valve 2 may also be arranged in the locking nipple 3. Specifically, the one-way valve 2 is disposed at one end of the locking connector 3 close to the injection port 10, the valve body top wall 214 is disposed close to the liquid outlet 312, and the second liquid flow port 212 is disposed away from the liquid outlet 312 and is sealingly fixed to the inner wall of the infusion tube inner cavity 310. Specifically, an infusion tube clamping groove 3131 surrounding the periphery of the infusion tube side wall 313 is formed in one end, close to the liquid inlet 311, of the infusion tube side wall 313, the valve body clamping protrusion 2131 is clamped with the infusion tube clamping groove 3131, the outer wall of the valve body 21 is in sealing connection with the inner wall of the infusion tube 31 through a sealing ring 5, and therefore the valve body 21 is fixed to one end, close to the liquid inlet 311, of the infusion tube inner cavity 310 in a sealing mode.

As shown in fig. 10, optionally, the one-way valve 2 may also be disposed at an end of the locking joint 3 away from the injection port 10. Specifically, the valve body 21 is a cylindrical structure with one end closed and the other end open, the valve body 21 has a cylindrical valve body side wall 213, a circular valve body top wall 214 and a second liquid flow port 212, the circular valve body top wall 214 is a closed end of the valve body 21, and the second liquid flow port 212 is an open end of the valve body 21. The circular valve top wall 214 is disposed near or beyond the liquid outlet 312, the second liquid passage 212 is formed on the inner wall of the infusion tube inner cavity 310, the flow blocking member 22 is annular, and the flow blocking member 22 is sleeved on the outer side of the valve side wall 213. The one-way valve 2 and the locking joint 3 are integrally formed, so that product parts are saved, the manufacturing cost of the product is reduced, and the assembly process of the product is simplified. With reference to fig. 10, the connection between the injection port 10 of the liquid storage container 1 and the liquid inlet 311 of the locking joint 3 is sealed and fixedly connected through an injection-blowing integrated process, which not only effectively improves the product quality, reduces the product manufacturing cost, but also saves the product manufacturing time. With continued reference to fig. 10, the outer wall of the infusion tube 31 has an outward-extending pressing auxiliary member 33 near the middle position, and the pressing auxiliary member 33 is used for assisting the hand to press the container bottom wall 13 of the liquid storage container 1 far from the end of the injection port 10 in the direction near the end of the injection port 10, so as to press the flushing liquid in the container inner cavity 11 to be injected from the injection port 10.

Preferably, the first fluid communication ports 211 are provided in two, symmetrically distributed on the side wall 213 of the valve body, so that the washing fluid can be uniformly and dispersedly injected from the fluid outlet 312 for sufficiently and thoroughly washing the catheter.

As shown in fig. 3, preferably, the outer wall of the valve body side wall 213 is provided with an annular sealing protrusion protruding outward, the inner wall of the infusion tube 31 is provided with an annular sealing groove recessed inward, and the valve body 21 and the infusion tube 31 are hermetically connected by the concave-convex matching of the sealing protrusion and the sealing groove, so that product parts are saved, the manufacturing cost of the product is reduced, and the product assembly process is simplified. With continued reference to fig. 3, the device further includes a sealing member 4, the sealing member 4 is in a cap shape and made of medical plastic material, in order to enhance the connection firmness between the sealing member 4 and the locking joint 3, the sealing member 4 is in threaded connection with the internal thread 321 of the collar 32, and the sealing member 4 is end-face sealed with the liquid outlet 312, so as to prevent the pre-filled washing liquid in the liquid storage container 1 from flowing out from the liquid outlet 312, thereby ensuring that the pre-filled washing liquid of the pre-filled syringe has no leakage before use. Fig. 3 is a schematic view only, and it is actually necessary to remove closure member 4 from collar 32 during the injection of the flushing liquid.

As shown in fig. 11, optionally, the liquid storage container 1 may also be a flexible container capable of being squeezed and deformed, and is in a bag structure, the container wall 15 of the liquid storage container 1 is at least partially a flexible container wall capable of being squeezed and deformed, and the flexible container wall is squeezed and deformed by hand, so as to change the volume of the container inner cavity 11, and then inject the flushing liquid in the container inner cavity 11 to complete the catheter flushing.

As shown in fig. 4, optionally, the flow blocking part 22 is in a membrane shape, a portion of the flow blocking part 22 is fixed to the periphery of the first liquid circulation port 211 at the outer side of the valve body side wall 213, and the fixed connection manner between the flow blocking part 22 and the periphery of the first liquid circulation port 211 may be a welding manner, a medical adhesive bonding manner, or a snap-fit manner, so that the material for manufacturing the product is saved, and the production cost of the product is reduced. Preferably, the fixed connection position of the flow resisting part 22 and the periphery of the first liquid circulation port 211 is closer to one end of the injection port 10, which is more beneficial to prevent the flushing liquid from flowing back to the inner cavity 11 of the container.

Referring to fig. 5, the second embodiment of the prefilled syringe provided by the present invention has substantially the same structure as the first embodiment, and the difference therebetween is that:

as shown in fig. 5, the liquid storage container 1 is a bellows that can be compressed in the lateral direction. Specifically, the injection port 10 is disposed at a position approximately in the middle of the container side wall 12, and the container cavity 11 is squeezed by pressing the two ends of the liquid storage container 1 by hand in a direction close to one end of the injection port 10, so as to inject the flushing liquid from the injection port 10. With continued reference to fig. 5, the valve body 21 is of a conical cylindrical configuration, the valve body 21 having a conical valve body cavity wall 215 and a second fluid communication port 212, the valve body cavity wall 215 enclosing a valve body cavity 210. The conical valve body cavity wall 215 further reduces the resistance to the flowing-out of the flushing liquid, and is more favorable for the flowing-out of the flushing liquid from the first liquid flow port 211 to the injection port 10, the valve body cavity wall 215 is provided with at least one first liquid flow port 211 penetrating through the valve body cavity wall 215, the valve body cavity wall 215 is provided with a tip 216, the tip 216 is arranged close to the injection port 10, the second liquid flow port 212 is far away from the injection port 10 and is hermetically fixed on the inner wall of the liquid storage container 1, and the second liquid flow port 212 is communicated with the first liquid flow port 211 through the valve body cavity 210. The connection between one end of the outer wall of the valve body 21 close to the second liquid circulation port 212 and the inner wall of the liquid storage container 1 is fixed and hermetically connected in a welding mode or a medical adhesive bonding mode. With reference to fig. 5, the distance from the center of the first liquid flow port 211 to the end of the valve body 21 close to the injection port 10 along the axial direction of the valve body 21 is greater than the distance from the center of the first liquid flow port 211 to the end of the valve body 21 far from the injection port 10 along the axial direction of the valve body 21, the flow blocking part 22 is made of medical polyurethane, the wall thickness of the end of the flow blocking part 22 close to the injection port 10 is greater than the wall thickness of the end far from the injection port 10, the first liquid flow port 211 is disposed at the end of the valve body 21 far from the injection port 10, and the wall thickness of the end of the flow blocking part 22 far from the injection port 10 is reduced, so that the flushing liquid is injected from the end of the valve body 21 far from the injection port 10, and the gas remained between the outer wall of the valve body 21 and the inner wall of the liquid storage container 1 is fully injected, And the flushing fluid is thoroughly discharged, so that the clinical effect of flushing the catheter by the flushing fluid is avoided being influenced.

With continued reference to fig. 5, the peripheral wall of the injection port 10 is extended outward to form a force application member 14 for facilitating hand holding, and the force application member 14 is provided with a reinforcing member 142 for enhancing the strength thereof. Specifically, the reinforcing member 142 is annular and made of a medical metal material, and the reinforcing member 142 is embedded in the wall of the force application member 14. When the force application part 14 is held by hands to be connected with the positive pressure joint, the problem that the force application part 14 is extruded and deformed to cause the flushing liquid to be extruded is effectively avoided.

Referring to fig. 6 and 7, a third embodiment of the prefilled syringe according to the present invention has substantially the same structure as the second embodiment, except that:

as shown in fig. 6, the sealing member 4 is connected to the liquid outlet 312 in a plugging manner, and the outer sidewall of the sealing member 4 is sealed with the inner sidewall of the liquid outlet 312 in an interference fit manner, so as to prevent the pre-filled flushing liquid in the liquid storage container 1 from flowing out to the outside through the liquid outlet 312, thereby ensuring that the pre-filled flushing liquid of the pre-filled syringe has no leakage before use. As shown in fig. 6 and 7, the valve body 21 is disposed upside down, the second liquid passage 212 is close to the injection port 10 and is hermetically fixed to the inner wall of the liquid storage container 1, the conical valve body top wall 214 is disposed away from the injection port 10, the flow blocking member 22 is in a diaphragm shape, and a portion of the flow blocking member 22 is fixed to the periphery of the first liquid passage 211 inside the valve body side wall 213. When the flushing liquid injection device is used, one end of the liquid storage container 1, which is far away from the injection port 10, is pressed by hand along the direction close to one end of the injection port 10, so that the container side wall 12 is compressed and deformed, and then the container inner cavity 11 is pressed, so that flushing liquid passes through the first liquid circulation port 211, the valve body cavity 210, the second liquid circulation port 212 and is injected from the liquid outlet 312 in sequence. As shown in fig. 7, the choke part 22 is annular, and the choke part 22 is sleeved on the inner side of the valve sidewall 213, so that the choke effect is good and the fixing is convenient. In order to facilitate product processing, assembly and reduce processing cost, the sealing component 4 is a part of the liquid outlet 312, and a flat sealing head is formed by thermally sealing the port of the liquid outlet 312, so that pre-filled flushing liquid in the liquid storage container 1 is prevented from flowing out to the outside from the liquid outlet 312.

Referring to fig. 8 and 9, the fourth embodiment of the prefilled syringe according to the present invention has substantially the same structure as the third embodiment, except that:

as shown in fig. 8, the valve body 21 is in a shape of a circular disc, the periphery of the valve body 21 is hermetically and fixedly connected with the inner wall of the liquid storage container 1 at one end close to the injection port 10, the valve body 21 is provided with at least one first liquid through hole 211 penetrating through two ends of the valve body 21 along the axial direction, and the choke portion 22 covers one side of the valve body 21 close to the injection port 10. Preferably, the first liquid circulation ports 211 are provided in plural numbers, and are uniformly distributed on the valve body 21 with the axis of the valve body 21 as the center.

With continued reference to fig. 8, the peripheral wall of the injection port 10 has an easy-to-hold force application part 14 extending in the axial direction of the liquid storage container 1 away from the container cavity 11, the wall thickness of the force application part 14 is greater than that of the part of the liquid storage container 1 except the force application part 14, and when the force application part 14 is held by hand and connected with the positive pressure joint, the problem that the force application part 14 is squeezed and deformed to cause the flushing liquid to be squeezed out is effectively avoided by increasing the strength of the force application part 14.

As shown in fig. 9, optionally, the liquid storage container 1 is a folding fan-shaped cylindrical structure with one end being unfolded and the other end being folded, and the injection port 10 is disposed at the folded end of the liquid storage container 1. In use, the extended end of the container sidewall 12 is manually squeezed inwardly to cause the container sidewall 12 to be compressively deformed, thereby squeezing the container interior 11 to inject the flushing fluid through the second fluid communication port 212, the valve body chamber 210, the first fluid communication port 211, and the fluid outlet 312 in sequence. With continued reference to fig. 9, optionally, an annular rib 141 or an axial rib 143 protruding outward is provided on the outer wall of the force application part 14, and the annular rib 141 or the axial rib 143 increases the strength of the force application part 14, so as to not only avoid the force application part 14 from being deformed by extrusion, but also save production materials and reduce the manufacturing cost of the product.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the utility model and are not to be construed as limiting the utility model. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims (15)

1. A prefilled syringe, comprising: the injection device comprises a liquid storage container (1) and a one-way valve (2), wherein the liquid storage container (1) is provided with an injection port (10), and the one-way valve (2) is arranged at one end of the injection port (10) of the liquid storage container (1); its characterized in that, check valve (2) include valve body (21) and choked flow part (22), valve body (21) are one end closed, other end open-ended tubular structure, the open end of valve body (21) is fixed or be formed at stock solution container (1) inner wall, valve body (21) lateral wall are provided with at least one first liquid circulation mouth (211), choked flow part (22) cover in first liquid circulation mouth (211) for prevent that the flush fluid from flowing back extremely stock solution container (1).

2. A prefilled syringe as set forth in claim 1, wherein the valve body (21) is a cylindrical structure or a conical cylindrical structure with an open end, the valve body (21) is disposed upright, the closed end of the valve body (21) is disposed close to or beyond the injection port (10), the open end of the valve body (21) is away from the injection port (10) and is sealingly fixed or formed on the inner wall of the liquid storage container (1), the first liquid passage opening (211) is disposed on the side wall of the valve body (21), and the flow blocking member (22) covers the outer side wall of the valve body (21).

3. A pre-filled syringe as set forth in claim 1, wherein the valve body (21) has a tapered cylindrical structure with an open end, the valve body (21) is disposed upright, the closed end of the valve body (21) is disposed close to or beyond the injection port (10), the open end of the valve body (21) is away from the injection port (10) and is sealingly fixed to the inner wall of the reservoir (1), the first liquid passage opening (211) is formed in the tapered wall of the valve body (21), and the flow blocking member (22) covers the outer side of the tapered wall of the valve body (21).

4. A prefilled syringe as set forth in claim 1, wherein said valve body (21) has a cylindrical structure or a conical cylindrical structure with one open end, said valve body (21) is disposed in an inverted state, the open end of said valve body (21) is close to said injection port (10) and is sealingly fixed to the inner wall of said liquid storage container (1), the closed end of said valve body (21) is disposed away from said injection port (10), said first liquid passage port (211) is opened in the side wall of said valve body (21), and said flow blocking member (22) covers the inner side wall of said valve body (21).

5. A pre-filled syringe as set forth in claim 1, wherein the valve body (21) has a tapered cylindrical structure with an open end, the valve body (21) is disposed in an inverted state, the open end of the valve body (21) is close to the injection port (10) and is sealingly fixed to the inner wall of the liquid storage container (1), the closed end of the valve body (21) is disposed away from the injection port (10), the first liquid passage port (211) is formed in a tapered wall of the valve body (21), and the flow blocking member (22) covers the inner side of the tapered wall of the valve body (21).

6. A prefilled syringe according to claim 1, wherein the wall thickness of said flow blocking member (22) at an end close to said injection port (10) is larger than the wall thickness at an end remote from said injection port (10).

7. A prefilled syringe according to claim 2 or 3, wherein said flow blocking member (22) is in the form of a diaphragm, and the flow blocking member (22) is fixed to the periphery of the first liquid passage port (211) at a portion of the outer wall of said valve body (21); or the choke part (22) is annular, and the choke part (22) is sleeved on the outer wall of the valve body (21).

8. A prefilled syringe according to claim 4 or 5, wherein said flow blocking member (22) is in the form of a diaphragm, and the flow blocking member (22) is fixed to the periphery of the first liquid passage port (211) at a portion of the inner wall of said valve body (21); or the choke part (22) is annular, and the choke part (22) is sleeved on the inner wall of the valve body (21).

9. A pre-filled syringe as set forth in claim 1, wherein said first liquid communication port (211) is provided in two, symmetrically distributed on a side wall of said valve body (21); alternatively, the first liquid circulation ports (211) are provided in plurality and are uniformly distributed on the side wall of the valve body (21) with the axis of the valve body (21) as the center.

10. A pre-filled syringe as set forth in claim 1, wherein the volume of the reservoir (1) is compressible.

11. A prefilled syringe as set forth in claim 10, wherein said reservoir (1) is a bellows compressible in the longitudinal direction; or the liquid storage container (1) is a corrugated pipe capable of being compressed along the transverse direction; or the liquid storage container (1) is a flexible container capable of being extruded and deformed.

12. A pre-filled syringe as set forth in claim 1, wherein the outer side wall of the injection port (10) of the liquid storage container (1) is extended outwardly to form a locking joint (3) which is engaged with the positive pressure joint; or the injection port (10) of the liquid storage container (1) is hermetically fixed with a locking joint (3).

13. A prefilled syringe, comprising: the liquid storage device comprises a liquid storage container (1), a locking connector (3) and a one-way valve (2), wherein the liquid storage container (1) is provided with an injection port (10), and the locking connector (3) is arranged at one end of the injection port (10) of the liquid storage container (1); its characterized in that, check valve (2) set up in locking joint (3), check valve (2) include valve body (21) and choked flow part (22), valve body (21) are one end closed, other end open-ended tubular structure, the open end of valve body (21) sealed fixed or be formed with locking joint (3) inner wall, valve body (21) lateral wall are provided with at least one first liquid circulation mouth (211), choked flow part (22) cover first liquid circulation mouth (211) for prevent that the flush fluid from flowing back extremely stock solution container (1).

14. A pre-filled syringe as set forth in claim 1 or 13, wherein a force applying member (14) for facilitating gripping and applying force is provided on an outer side wall of one end of the injection port (10) of the liquid storage container (1) or an outer side wall of the locking joint (3).

15. A prefilled syringe, comprising: the injection device comprises a liquid storage container (1) and a one-way valve (2), wherein the liquid storage container (1) is provided with an injection port (10), and the one-way valve (2) is arranged at one end of the injection port (10) of the liquid storage container (1); the check valve (2) comprises a valve body (21) and a flow blocking part (22), wherein the valve body (21) is in a wafer shape, the periphery of the valve body (21) is sealed and fixed or formed on the inner wall of the liquid storage container (1), the valve body (21) is provided with at least one first liquid flow opening (211), and the flow blocking part (22) covers the first liquid flow opening (211) close to one side of the injection opening (10) and is used for preventing flushing liquid from flowing back to the liquid storage container (1).

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