Positive pressure needle-free connector

Abstract

The present invention relates to a positive pressure needle-free connector, comprising a shell, an elastic deformable member and a puncture guide assembly, wherein the shell comprises an inner cavity and a catheter; the elastic deformable member is arranged in the inner cavity, and the elastic deformable member comprises a cavity; the puncture guide assembly is arranged in the cavity, and the puncture guide assembly comprises a puncture portion and a guide member, wherein the puncture portion is connected to the guide member, and the guide member is provided with a guide portion and a guide hole, wherein the guide portion and the guide hole are connected, and the guide hole and the elastic deformable member are in a close fit state in an initial state, and in the close fit state, the guide hole is not conductive. The present invention cooperates with the elastic deformable member and the puncture guide assembly, and when the needle-free syringe is separated from the elastic deformable member, a negative pressure state is instantly formed in the cavity of the elastic deformable member, and at this time, the elastic deformable member contracts and resets, so that the elastic deformable member and the guide portion are restored to the initial close fit state, that is, the guide portion is not conductive, and the injection liquid cannot flow back through the guide portion, thereby solving the problem that the needle-free connector in the prior art easily causes the liquid to flow back.

Description

Technical Field

[0001] The present invention relates to the technical field of needle-free connectors, and in particular to a positive-pressure needle-free connector. Background Art

[0002] Traditionally, injecting medication into a catheter or IV bottle typically involves using a syringe to inject the liquid into the catheter or IV bottle, allowing the liquid to flow through an infusion tube into the patient's body. Traditional syringes inevitably have a needle, and this design poses a risk of needlesticks to medical personnel. To mitigate this risk, various needle-free connectors have been developed. However, during use, the instantaneous negative pressure generated within the housing of existing needle-free connectors can easily lead to backflow of medication. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the needle-free connector in the prior art that it easily causes the backflow of the drug solution.

[0004] In order to solve the above technical problems, the present invention provides a positive pressure needle-free connector, comprising:

[0005] a housing comprising an inner cavity and a conduit;

[0006] an elastic deformable member, the elastic deformable member being disposed in the inner cavity and comprising a cavity;

[0007] a puncture guide assembly, the puncture guide assembly being disposed in the cavity, the puncture guide assembly comprising a puncture portion and a guide member, the puncture portion being connected to the guide member, the guide member comprising a guide portion penetrating the interior and exterior of the guide member, wherein the guide portion and the elastic deformable member are in a tightly fitted state in an initial state, and in the tightly fitted state, the guide portion is not conductive;

[0008] When a needle-free syringe is used to push against the elastic deformable member, the puncture portion punctures the elastic deformable member, and the injection liquid flows into the cavity. A positive pressure state is instantly formed in the cavity, and the elastic deformable member expands to make the guide part conductive. The injection liquid passes through the guide part from the outside of the guide part into the inside of the guide part and enters the catheter.

[0009] When the needle-free injection barrel is separated from the elastic deformation member, a negative pressure state is instantly formed in the cavity, and the elastic deformation member and the guide portion return to the initial close fitting state.

[0010] In one embodiment of the present invention, the elastic deformation member includes an elastic deformation portion and an elastic frame, the elastic deformation portion is connected to the elastic frame, and the conduction of the guide portion is achieved by expansion and resetting of the elastic deformation portion.

[0011] In one embodiment of the present invention, the other end of the elastic deformation part relative to the elastic frame is provided with an easy-to-puncture part. When a needle-free syringe is used to push against the elastic deformation part, the elastic deformation part moves accordingly so that the puncture part punctures the easy-to-puncture part.

[0012] In one embodiment of the present invention, a cap body is provided at the other end of the shell relative to the catheter, and the puncture-prone portion is accommodated in the cap body and can move within the cap body. When a needle-free syringe is used to push against the elastic deformation portion, the puncture-prone portion moves accordingly so that the puncture portion pierces the puncture-prone portion.

[0013] In one embodiment of the present invention, the elastic frame includes a partition portion, which is arranged at the other end of the elastic frame away from the elastic deformation portion. The partition portion faces the catheter, and the circulation or isolation of the injection liquid is achieved by opening or closing the partition portion.

[0014] In one embodiment of the present invention, the partition portion includes a pair of valve flaps, one end of the valve flap is fixedly connected to the elastic frame, and the other end of the valve flap is opened or closed to achieve the circulation or isolation of the injection liquid.

[0015] In one embodiment of the present invention, the flow guide comprises a first flow channel and a second flow channel, the first flow channel and the second flow channel are respectively arranged outside and inside the flow guide, and the first flow channel and the second flow channel are connected through the flow guide portion.

[0016] In one embodiment of the present invention, the guide portion is a guide hole, which is arranged on the first flow channel. When the guide hole and the elastic deformation portion are in an initial tight fit state, the first flow channel and the second flow channel are not connected; when the elastic deformation portion expands, the first flow channel and the second flow channel are connected.

[0017] In one embodiment of the present invention, the housing includes a first housing and a second housing, and the first housing and the second housing are snap-connected.

[0018] In one embodiment of the present invention, the first shell and the second shell are provided with concave-convex ribs, and the end surfaces of the first shell and the second shell provided with the concave-convex ribs are oblique conical surfaces, and the first shell and the second shell are sealed and connected by the concave-convex ribs.

[0019] The above technical solution of the present invention has the following advantages over the prior art:

[0020] The present invention cooperates with the elastic deformable part and the puncture guide assembly. When the needle-free injection barrel is separated from the elastic deformable part, a negative pressure state is instantly formed in the cavity of the elastic deformable part. At this time, the elastic deformable part contracts and resets, so that the elastic deformable part and the guide part return to the initial tight state, that is, the guide hole is not conductive, and the injection liquid cannot flow back through the guide part, which effectively solves the problem that the needle-free connector in the prior art easily causes the backflow of the drug solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings, wherein

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 yes Figure 1 Top view of .

[0024] Figure 3 yes Figure 2 Schematic cross-section of upper AA.

[0025] Figure 4 yes Figure 2 Schematic cross-section of the upper BB.

[0026] Figure 5 It is a structural schematic diagram of the puncture diversion component of the present invention.

[0027] Figure 6 It is a structural schematic diagram of the elastic deformation part of the present invention.

[0028] Figure 7 It is a structural schematic diagram of the elastic frame of the present invention.

[0029] Explanation of the reference numerals in the specification: 110, first shell; 120, second shell; 130, inner cavity; 140, catheter; 150, cap body; 210, elastic deformation portion; 211, puncture-prone portion; 220, elastic frame; 221, valve flap; 230, cavity; 300, puncture guide assembly; 310, puncture portion; 320, guide member; 321, guide portion; 322, first flow channel; 323, second flow channel. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0031] Please refer to Figures 1 to 7 As shown, an embodiment of the present invention provides a positive pressure needle-free connector, including a shell, an elastic deformable member and a puncture guide component 300.

[0032] The housing includes a first housing 110 and a second housing 120, which are snap-fitted together. Preferably, concave and convex ribs may be provided on the first housing 110 and the second housing 120, and the end surfaces of the first housing 110 and the second housing 120 on which the concave and convex ribs are provided are oblique conical surfaces, so that the first housing 110 and the second housing 120 are sealed together by the concave and convex ribs.

[0033] The first shell 110 is provided with an inner cavity 130, which forms a cap body 150 at one end of the first shell 110, and the inner cavity 130 is used to accommodate the elastic deformation member; the second shell 120 is provided with a catheter 140, which is used to guide the injection liquid to be discharged.

[0034] The elastic deformation member is disposed in the inner cavity 130 , and the elastic deformation member includes a cavity 230 , and the cavity 230 is used to accommodate the puncture guide assembly 300 .

[0035] The elastic deformation member includes an elastic deformation portion 210 and an elastic frame 220 . The elastic deformation portion 210 and the elastic frame 220 are accommodated in the inner cavity 130 of the first shell 110 , and the elastic deformation portion 210 is connected to the elastic frame 220 .

[0036] The other end of the elastic deformation portion 210 relative to the elastic frame 220 is provided with an easy-to-puncture portion 211, which is accommodated in the cap body 150 and can move in the cap body 150. The easy-to-puncture portion 211 is preferably made of silicone material. When a needle-free syringe (not shown in the figure) is used to push against the elastic deformation portion 210, the easy-to-puncture portion 211 made of silicone material moves accordingly so that the puncture portion 310 punctures the easy-to-puncture portion 211. Of course, it can also be other easy-to-puncture portions 211 that can be punctured, and this embodiment is not limited to this.

[0037] The elastic frame 220 includes a partition portion, which is arranged at the other end of the elastic frame 220 away from the elastic deformation portion 210. The partition portion faces the catheter 140, and the flow or isolation of the injection liquid is achieved by opening or closing the partition portion.

[0038] More specifically, the barrier portion includes a pair of valve flaps 221, one end of which is fixedly connected to the elastic frame 220, and the other end of which opens or closes to allow or block the flow of the injection liquid. The valve flaps 221 are in an open state when subjected to the compressive force of the flow guide 320. When the compressive force of the flow guide 320 disappears, the valve flaps 221 return to a closed state. The principle of opening or closing the valve flaps 221 is as follows: when the puncture portion 310 pierces the puncture-prone portion 211 of the elastically deformable portion 210, based on the principle of action and reaction, the puncture-prone portion 211 exerts an equal downward force on the puncture portion 310 (i.e., the flow guide 320), causing the valve flaps 221 to open when squeezed. When the squeezing force disappears, the valve flaps 221 return to a closed state, effectively preventing the problem of injection liquid backflow caused by the housing being in a momentary negative pressure state.

[0039] The puncture guide assembly 300 is arranged in the cavity 230. The puncture guide assembly 300 includes a puncture portion 310 and a guide member 320. The puncture portion 310 is connected to the guide member 320. The guide member 320 includes a guide portion 321 that passes through the inside and outside of the guide member 320. The guide portion 321 and the elastic deformation portion 210 are in a tight fit in the initial state. In the tight fit state, the guide portion 321 is not conductive.

[0040] The flow guide 320 includes a first flow channel 322 and a second flow channel 323, which are disposed on the outside and inside of the flow guide 320, respectively. The first flow channel 322 and the second flow channel 323 are connected via a flow guide portion 321. The flow guide portion 321 is a flow guide hole disposed on the first flow channel 322. When the flow guide hole and the elastic deformation portion 210 are in an initial, tightly fitted state, the first flow channel 322 and the second flow channel 323 are disconnected. When the elastic deformation portion 210 expands, the first flow channel 322 and the second flow channel 323 become connected.

[0041] The working principle of the present invention is as follows: when a needle-free syringe is used to push against the puncture-prone portion 211 of the elastic deformation portion 210, the elastic deformation portion 210 is compressed and moves accordingly, so that the puncture portion 310 pierces the puncture-prone portion 211, and the puncture portion 310 pierces the silicone on the needle-free syringe (not shown in the figure), and the injection liquid flows into the cavity 230. A positive pressure state is instantly formed in the cavity 230, and the elastic deformation portion 210 expands to connect the guide hole, that is, the first flow channel 322 and the second flow channel 323 are connected, and the injection liquid is discharged from the first flow channel 322 to the second flow channel 323. The flow channel 322 enters the second flow channel 323 through the guide hole, and enters the catheter 140 along the second flow channel 323; when the needle-free syringe is separated from the elastic deformation part 210, a negative pressure state is instantly formed in the cavity 230, and the elastic deformation part 210 and the guide hole return to the initial tight state, and the guide hole is not conductive, that is, the first flow channel 322 and the second flow channel 323 are not conductive, and the injection liquid in the second flow channel 323 cannot flow back through the guide hole, which effectively solves the problem of the needle-free connector in the prior art that easily causes the liquid to flow back.

[0042] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A positive pressure needle-free connector, characterized in that: include: a housing comprising an inner cavity and a conduit; an elastic deformable member, the elastic deformable member being disposed in the inner cavity and comprising a cavity; a puncture guide assembly, the puncture guide assembly being disposed in the cavity, the puncture guide assembly comprising a puncture portion and a guide member, the puncture portion being connected to the guide member, the guide member comprising a guide portion penetrating the interior and exterior of the guide member, wherein the guide portion and the elastic deformable member are in a tightly fitted state in an initial state, and in the tightly fitted state, the guide portion is not conductive; The flow guide comprises a first flow channel and a second flow channel, the first flow channel and the second flow channel being respectively arranged on the outside and inside of the flow guide, and the first flow channel and the second flow channel being connected via the flow guide portion; the flow guide portion is a flow guide hole, and the flow guide hole is arranged on the first flow channel. When the flow guide hole and the elastic deformation portion are in an initial tight fit state, the first flow channel and the second flow channel are not connected; when the elastic deformation portion expands, the first flow channel and the second flow channel are connected; When a needle-free syringe is used to push against the elastic deformable member, the puncture portion punctures the elastic deformable member, and the injection liquid flows into the cavity. A positive pressure state is instantly formed in the cavity, and the elastic deformable member expands to make the guide part conductive. The injection liquid passes through the guide part from the outside of the guide part into the inside of the guide part and enters the catheter. When the needle-free injection barrel is separated from the elastic deformation member, a negative pressure state is instantly formed in the cavity, and the elastic deformation member and the guide portion return to the initial close fitting state; The elastic deformation member includes an elastic deformation portion and an elastic frame, wherein the elastic deformation portion is connected to the elastic frame, and the conduction of the guide portion is achieved by expansion and reset of the elastic deformation portion.

2. The positive pressure needle-free connector according to claim 1, characterized in that: The other end of the elastic deformation part relative to the elastic frame is provided with an easy-to-puncture part. When a needle-free syringe is used to push against the elastic deformation part, the elastic deformation part moves accordingly so that the puncture part punctures the easy-to-puncture part.

3. The positive pressure needle-free connector according to claim 1, characterized in that: The shell is provided with a cap body at the other end opposite to the catheter. The puncture-prone portion is accommodated in the cap body and can move within the cap body. When a needle-free syringe is used to push against the elastic deformation portion, the puncture-prone portion moves accordingly so that the puncture portion punctures the puncture-prone portion.

4. The positive pressure needle-free connector according to claim 1, wherein: The elastic frame includes a partition portion, which is arranged at the other end of the elastic frame away from the elastic deformation portion. The partition portion faces the catheter, and the circulation or isolation of the injection liquid is achieved by opening or closing the partition portion.

5. The positive pressure needle-free connector according to claim 4, characterized in that: The partition part includes a pair of valve flaps, one end of the valve flap is fixedly connected to the elastic frame, and the other end of the valve flap is opened or closed to achieve the circulation or isolation of the injection liquid.

6. The positive pressure needle-free connector according to claim 1, characterized in that: The housing comprises a first housing and a second housing, and the first housing and the second housing are connected by snap-fitting.

7. The positive pressure needle-free connector according to claim 6, characterized in that: The first shell and the second shell are provided with concave-convex ribs, and the end surfaces of the first shell and the second shell provided with the concave-convex ribs are oblique conical surfaces. The first shell and the second shell are sealed and connected by the concave-convex ribs.

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