A needle-free connector

Abstract

The present invention discloses a needle-free connector, comprising a shell, comprising a first shell and a second shell, the first shell and the second shell are snap-connected; a catheter is accommodated in the first shell, for guiding the injection liquid to be discharged; an elastic frame is accommodated in the second shell, the elastic frame comprises a fixed part, a movable part and a partition part, the fixed part is fixedly connected to the movable part and the fixed part is fixedly arranged on the inner side wall of the second shell, the partition part is connected to the fixed part, and the circulation or partition of the injection liquid is realized by opening or closing the partition part; a puncture tube is accommodated in the elastic frame, the puncture tube comprises a guide part and a puncture head, and the puncture head is connected with the guide part. The present invention has a simple and compact structure, and the puncture head punctures the silicone on the needle-free injection cylinder through the movement of the elastic frame, and the abutment effect is significant and does not leak liquid, and a pair of valve flaps that automatically open or close are provided, and when the needle-free injection cylinder is separated from the movable part of the elastic frame, the pair of valve flaps are instantly closed, effectively avoiding the problem of injection liquid reflux due to the shell being in a negative pressure state for a moment.

Description

Technical Field

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

[0002] Traditionally, if you want to inject liquid medicine into a catheter or an IV bottle, you usually use a syringe to inject the liquid medicine in the syringe into the catheter or the IV bottle, so that the liquid medicine flows into the patient's body through an infusion tube. Traditional syringes must be equipped with a needle. Due to the design of the needle, medical staff may be at risk of being pricked by the needle. In order to avoid this risk, different styles of needle-free connectors have been developed.

[0003] The invention patent needle-free connector with the prior art authorization announcement number CN203090116U discloses a needle-free connector for connecting a catheter, the needle-free connector comprising: a shell, comprising a first shell and a first clamping portion, the first shell is coupled to the catheter; an elastic frame body is accommodated in the shell, the elastic frame body comprises a first stop portion, a second stop portion, a second clamping portion and a third clamping portion, wherein the second clamping portion is used to clamp the first clamping portion; a rod body is accommodated in the elastic frame body, the rod body comprises a second shell, a clamping ring, a baffle ring and a solid portion, wherein the second shell is sleeved in the first shell, the clamping ring is sleeved on the third clamping portion and abuts against the first stop portion, and the baffle ring abuts against the second stop portion; and a cap body, coupled to the shell, for accommodating the solid portion. The needle-free connector provided by the present invention has a light structure, is inexpensive to manufacture, is not technically difficult, and can produce a good sealing effect, preventing liquid from leaking out. However, in actual use, the medicine follows the cross indentation, passes through the slit, along the transverse through hole, the second shell, and then flows through the first shell, the external catheter, and finally enters the patient's body. When the needle-free syringe leaves the solid part, a negative pressure state is instantly generated in the shell, which can easily cause the injection liquid to reflux. Therefore, the needle-free connector of the prior art has the problem of negative pressure reflux.

[0004] Therefore, in order to solve the above-mentioned technical problems, the present invention provides a needle-free connector, which has a simple and compact structure, a significant abutment effect and no liquid leakage, and is provided with a pair of valve flaps that automatically open or close, thereby effectively avoiding the problem of backflow of injected liquid due to the shell being in a negative pressure state instantaneously, and is convenient and practical. Summary of the invention

[0005] The present invention provides a needle-free connector, comprising:

[0006] The housing comprises a first housing and a second housing, wherein the first housing and the second housing are connected by snap-fit;

[0007] A catheter, contained in the first shell, for guiding the injection liquid to be discharged;

[0008] An elastic frame is accommodated in the second shell, the elastic frame includes a fixed part, a movable part and a partition part, the fixed part is fixedly connected to the movable part and the fixed part is fixedly arranged on the inner side wall of the second shell, the partition part is connected to the fixed part, and the flow or partition of the injection liquid is realized by opening or closing the partition part;

[0009] A puncture tube is accommodated in the elastic frame, and the puncture tube includes a flow guide portion and a puncture head, and the puncture head is connected to the flow guide portion;

[0010] When a needle-free syringe is used to push against the movable part of the elastic frame, the elastic frame moves accordingly so that the puncture head pierces the movable part and the silicone on the needle-free syringe, and the injection liquid passes through the partition part in a straight line along the guide part into the catheter and is discharged;

[0011] When the needle-free injection cylinder leaves the movable portion of the elastic frame, the elastic frame and the housing return to a tightly fitted state.

[0012] With the above technical solution, the movable part of the elastic frame is provided with an easy-to-puncture part at the other end relative to the fixed part. When a needle-free syringe is used to push against the movable part of the elastic frame, the elastic frame moves accordingly so that the puncture head punctures the easy-to-puncture part.

[0013] By adopting the above technical solution, the second shell includes a cap body, and the puncture-prone portion is accommodated in the cap body and can move inside the cap body. When a needle-free syringe is used to push against the movable part of the elastic frame body, the puncture-prone portion moves accordingly so that the puncture head punctures the puncture-prone portion.

[0014] With the above technical solution, the puncture-prone portion is a silicone portion. When a needle-free syringe is used to push against the movable portion of the elastic frame, the silicone portion moves accordingly so that the puncture head punctures the silicone portion.

[0015] By adopting the above technical scheme, an elastic part is provided in the middle of the movable part included in the elastic frame. When a needle-free syringe is used to push against the movable part of the elastic frame, the elastic part on the movable part is compressed so that the puncture head pierces the puncture-prone part. When the needle-free syringe leaves the movable part of the elastic frame, the elastic part resets and drives the elastic frame and the shell to return to a tight state.

[0016] With the above technical solution, the partition part is arranged at the other end of the puncture tube opposite to the puncture head and directly facing the catheter part, and the circulation or isolation of the injection liquid is achieved by opening or closing the partition part.

[0017] With the above technical solution, the partition part includes a pair of valve flaps, one end of the pair of valve flaps is fixedly connected to the fixed part of the elastic frame, and the other end of the pair of valve flaps is opened or closed to achieve the circulation or partition of the injection liquid.

[0018] With the above technical solution, the general structure of the pair of valve flaps is funnel-shaped. The pair of funnel-shaped valve flaps are in an open state when subjected to the squeezing force of the puncture tube. When the squeezing force of the puncture tube disappears, the pair of valve flaps return to a closed state.

[0019] By adopting the above technical solution, a plurality of filter membranes are arranged between the conduit and a pair of valve flaps.

[0020] According to the above technical solution, 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 cone surfaces, and the first shell and the second shell are sealed and connected by the concave-convex ribs.

[0021] Beneficial effects of the present invention:

[0022] 1. The structure of the present invention is simple and compact. The puncture head punctures the silicone on the needle-free syringe through the movement of the elastic frame, and the sticking effect is significant without leakage. In addition, a pair of valve flaps that automatically open or close are provided. When the needle-free syringe is separated from the movable part of the elastic frame, the pair of valve flaps are instantly closed, effectively avoiding the problem of injection liquid backflow due to the shell being in a negative pressure state for a moment;

[0023] 2. When the puncture head of the puncture tube of the present invention punctures the easily punctured part, the injection liquid directly enters the guide part, and the injection liquid passes through the partition part in a straight line along the guide part into the catheter and is discharged, so that the flow path of the injection liquid is a straight line, which can effectively prevent the problem of the injection liquid remaining everywhere in the elastic frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention.

[0025] Figure 2 yes Figure 1 main view.

[0026] Figure 3 yes Figure 1 Top view of the .

[0027] Figure 4 yes Figure 1 Bottom view of .

[0028] Figure 5 yes Figure 4 Schematic diagram of the cross section of upper AA.

[0029] Figure 6 yes Figure 5 A partial enlarged schematic diagram of part B above.

[0030] Explanation of the numbers in the figure: 1. Shell; 11. First shell; 12. Second shell; 13. Cap; 2. Conduit; 3. Elastic frame; 31. Fixed part; 311. Valve flap; 32. Movable part; 321. Puncture-prone part; 322. Elastic part; 4. Puncture tube; 41. Guide part; 42. Puncture head; 5. Filter membrane. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements including the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0033] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must include a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Reference Figures 1 to 6As shown, the present invention provides a needle-free connector, comprising a shell 1, comprising a first shell 11 and a second shell 12, the first shell and the second shell are snap-connected, for example, 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 cone surfaces, the first shell and the second shell are sealed and connected through the concave-convex ribs, the first shell 11 contains a catheter 2 to guide the injection liquid to be discharged, the second shell 12 contains an elastic frame 3, more specifically, the elastic frame 3 includes a fixed portion 31, a movable portion 32 and a partition portion, the fixed portion 31 is fixedly connected to the movable portion 32 and the fixed portion 31 is fixedly arranged on the inner side of the second shell 12 The wall and the partition part are connected to the fixed part 31, and the fixed part 31 is fixedly arranged at the other end of the second shell 12 relative to the cap body 13. When the elastic frame 3 is subjected to force, the fixed part 31 does not move, and the movable part 32 realizes the movement of the elastic frame 3 in the second shell 12 by telescoping. The second shell 12 includes a cap body 13, and the cap body 13 contains the puncture-prone part 321 of the elastic frame 3. The puncture-prone part 321 is arranged at the other end of the movable part 32 relative to the fixed part 31, and is used to abut against the silicone port of a needle-free syringe (not shown in the figure), and when a needle-free syringe (not shown in the figure) is used to push against the puncture-prone part 321, the puncture-prone part 321 is subjected to force and moves in the cap body 13.

[0036] In this embodiment, refer to Figure 5 and Figure 6 As shown, a puncture tube 4 is placed in the elastic frame 3, and the puncture tube 4 includes a guide part 41 and a puncture head 42. The puncture head 42 is connected with the guide part 41. When a needle-free syringe (not shown in the figure) is used to push against the movable part 32 of the elastic frame 3, the elastic frame 3 moves accordingly so that the puncture head 42 pierces the movable part 32 and pierces the silicone on the needle-free syringe (not shown in the figure), and the injection liquid enters the catheter 2 along the guide part 41 and is discharged. When the needle-free syringe (not shown in the figure) leaves the movable part 32 of the elastic frame 3, the elastic frame 3 and the housing 1 return to a close state.

[0037] In a preferred solution of the present embodiment, the puncture tube 4 is cross-shaped, and the outer side wall of the cross-shaped puncture tube 4 is fixed on the fixing portion 31 of the elastic frame 3. Of course, the structure of the puncture tube can also be T-shaped, etc. The present invention is not limited thereto. As long as the puncture tube can achieve the same functional role as the present invention, any deformation of the puncture tube in shape falls within the protection scope of the present invention.

[0038] In this embodiment, the puncture-prone portion 321 is accommodated in the cap body 13 and can move within the cap body 13. The puncture-prone portion 321 is preferably a silicone portion. When a needle-free syringe (not shown in the figure) is used to push against the movable portion 32 of the elastic frame 3, the silicone portion moves accordingly so that the puncture head 42 pierces the silicone portion. Of course, it can also be other puncture-prone portions 321 that can be pierced by the puncture head 42, and this embodiment is not limited to this.

[0039] In this embodiment, refer to Figure 6 As shown, an elastic part 322 is provided in the middle of the movable part 32 included in the elastic frame 3, and the elastic part 322 is preferably a spring. When a needle-free syringe (not shown in the figure) is used to push against the movable part 32 of the elastic frame 3, the spring on the movable part 32 is compressed so that the puncture head 42 pierces the easy-to-puncture part 321. When the needle-free syringe (not shown in the figure) leaves the movable part 32 of the elastic frame 3, the spring resets and drives the elastic frame 3 and the shell 1 to return to a tight state. Of course, it can also be other elastic parts 322 that can realize the movement of the elastic frame 3, and this embodiment is not limited to this.

[0040] In this embodiment, refer to Figure 6 As shown, the elastic frame 3 includes a partition portion, which is arranged at the other end of the puncture tube 4 relative to the puncture head 42 and directly facing the catheter 2, and the flow or isolation of the injection liquid is achieved by opening or closing the partition portion;

[0041] More specifically, the partition portion includes a pair of valve flaps 311, one end of the pair of valve flaps 311 is fixedly connected to the fixed portion 31 of the elastic frame 3, and the other end of the pair of valve flaps 311 is opened or closed to realize the circulation or partition of the injection liquid. The general structure of the pair of valve flaps 311 is funnel-shaped. The funnel-shaped pair of valve flaps 311 is in an open state when subjected to the squeezing force of the puncture tube 4. When the squeezing force of the puncture tube 4 disappears, the pair of valve flaps 311 returns to a closed state. The pair of valve flaps 311 is opened or closed. The principle is as follows: when the puncture head 42 punctures the puncture-prone portion 321 of the elastic frame 3, according to the principle of action and reaction, the puncture-prone portion 321 applies an equal downward force to the puncture tube 4 so that the pair of valve flaps 311 are squeezed by the puncture tube 4. The pair of valve flaps 311 are in an open state when squeezed by the puncture tube 4. When the squeezing of the puncture tube 4 disappears, the pair of valve flaps 311 return to a closed state, effectively avoiding the problem of reflux of the injected liquid due to the shell 1 being in a negative pressure state for a moment.

[0042] In this embodiment, refer to Figure 6 As shown, a multi-layer filter membrane 5 is arranged between the catheter 2 and a pair of valve flaps 311 to filter the injection liquid. The number of layers of the filter membrane 5 is selected according to actual usage requirements. For example, it can be 7 layers, 8 layers, 13 layers, 14 layers, or 17 layers or 18 layers. This embodiment is not limited to this.

[0043] The working principle of the present invention is as follows: when a needle-free syringe is used to push against the movable part 32 of the elastic frame 3, the elastic part 322 is compressed and moves along the trend so that the puncture head 42 pierces the easy-to-puncture part 321 and pierces the silicone on the needle-free syringe (not shown in the figure). At the same time, the downward squeezing force of the puncture tube 4 on the partition part causes the pair of valve flaps 311 to open, and the injection liquid flows through the guide part 41 and enters the catheter 2 through the opened valve flap 311, and flows out along the catheter 2; when the needle-free syringe (not shown in the figure) leaves the movable part 32 of the elastic frame 3, the elastic part 322 of the movable part 32 is reset to drive the elastic frame 3 to move along the trend so that the puncture head 42 is separated from the easy-to-puncture part 321, and at the same time, the squeezing force of the puncture tube 4 on the partition part disappears, and the pair of valve flaps 311 are closed, so as to avoid the injection liquid from flowing back due to the shell 1 being in a negative pressure state for a moment.

[0044] The beneficial effects of the present invention: The present invention provides a needle-free connector with a simple and compact structure, a significant sticking effect and no liquid leakage, and a pair of valve flaps that automatically open or close, which effectively avoids the problem of backflow of injected liquid due to the shell being in a negative pressure state instantaneously, and is convenient and practical.

[0045] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A needle-free connector, characterized in that: include: The housing comprises a first housing and a second housing, wherein the first housing and the second housing are connected by snap-fit; A catheter, contained in the first shell, for guiding the injection liquid to be discharged; An elastic frame is accommodated in the second shell, the elastic frame includes a fixed part, a movable part and a partition part, the fixed part is fixedly connected to the movable part and the fixed part is fixedly arranged on the inner side wall of the second shell, the partition part is connected to the fixed part, and the flow or partition of the injection liquid is realized by opening or closing the partition part; A puncture tube is accommodated in the elastic frame, and the puncture tube includes a flow guide portion and a puncture head, and the puncture head is connected to the flow guide portion; When a needle-free syringe is used to push against the movable part of the elastic frame, the elastic frame moves accordingly so that the puncture head pierces the movable part and the silicone on the needle-free syringe, and the injection liquid passes through the partition part in a straight line along the guide part into the catheter and is discharged; When the needle-free injection barrel leaves the movable portion of the elastic frame, the elastic frame and the housing return to a close fitting state; The movable part of the elastic frame is provided with an easy-to-pierce part at the other end relative to the fixed part, and the easy-to-pierce part is used to abut against the silicone port of the needle-free syringe. When a needle-free syringe is used to push against the movable part of the elastic frame, the elastic frame moves accordingly so that the puncture head pierces the easy-to-pierce part and the silicone on the needle-free syringe.

2. The needle-free connector according to claim 1, characterized in that: The second shell includes a cap body, and the puncture-prone portion is accommodated in the cap body and can move in the cap body. When a needle-free syringe is used to push against the movable part of the elastic frame body, the puncture-prone portion moves accordingly so that the puncture head punctures the puncture-prone portion.

3. A needle-free connector according to claim 1 or 2, characterized in that: The puncture-prone part is a silicone part. When a needle-free syringe is used to push against the movable part of the elastic frame, the silicone part moves accordingly so that the puncture head punctures the silicone part.

4. The needle-free connector according to claim 1, characterized in that: An elastic part is provided in the middle of the movable part included in the elastic frame. When a needle-free syringe is used to push against the movable part of the elastic frame, the elastic part on the movable part is compressed so that the puncture head pierces the puncture-prone part. When the needle-free syringe leaves the movable part of the elastic frame, the elastic part is reset to drive the elastic frame and the shell to return to a tight state.

5. The needle-free connector according to claim 1, characterized in that: The partition part is arranged at the other end of the puncture tube opposite to the puncture head and directly facing the catheter part, and the circulation or partition of the injection liquid is achieved by opening or closing the partition part.

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

7. The needle-free connector according to claim 6, characterized in that: The general structure of the pair of valve flaps is funnel-shaped. The pair of funnel-shaped valve flaps are in an open state when subjected to the squeezing force of the puncture tube. When the squeezing force of the puncture tube disappears, the pair of valve flaps return to a closed state.

8. The needle-free connector according to claim 1 or 7, characterized in that: A plurality of filter membranes are arranged between the conduit and a pair of valve flaps.

9. The needle-free connector according to claim 1, 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 cone surfaces, and the first shell and the second shell are sealed and connected via the concave-convex ribs.

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