Constant-pressure needleless infusion connector

Abstract

The utility model discloses a constant-pressure needleless infusion connector. The constant-pressure needleless infusion connector comprises a shell, wherein the shell is formed by connecting an upper shell and a lower shell; the top of the upper silica gel piece is provided with a sealing part with a notch, a conical cavity, a first through hole and a first channel which are communicated in sequence are arranged below the sealing part, and the notch can be opened when the top of the sealing part is pressed; a second through hole is formed in the top of the flow guide piece, a side through hole is formed in the side face, the upper end of the flow guide piece is inserted into the first channel, and multiple vertically-through flow guide notches are distributed in the periphery of the third annular part; the lower silica gel piece is arranged in the lower shell, a confluence groove is formed in the upper end of the lower silica gel piece, a liquid outlet through hole is formed in the lower end of the lower silica gel piece, the confluence groove is communicated with the side through hole through a flow guide notch, the liquid outlet through hole is communicated with a liquid outlet channel in the lower shell, and the fourth annular part is located between the second annular part and the top of the lower shell; by the adoption of the technical scheme, when the liquid outlet end of the injection device is pulled out, it is guaranteed that the automatic springback characteristic of the injection device is not affected, and it is guaranteed that the sealing performance of the needleless infusion connector is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field related to infusion connectors, in particular to a constant-pressure needle-free infusion connector. Background Art

[0002] Needle-free connectors have a long history of production and application internationally. Due to their ease of use, safety and reliability, they have been increasingly widely used in clinical practice. Needle-free connectors are suitable for connecting blood transfusion and infusion lines, but existing needle-free connectors are prone to leakage during the infusion process, and the internal structure often fails to close automatically after the infusion is completed. During use, the airtightness of the needle-free closed infusion connector is particularly important. If the airtightness is poor, it is easy for gas or external pollution sources to enter the human body, increasing the chance of gas embolism or bloodstream infection in the human body. The use of existing needle-free closed infusion connectors reduces the incidence of needlestick injuries, but their airtightness is still insufficient, and gas embolism and bloodstream infection are prone to occur during use. Utility Model Content

[0003] In order to overcome the existing technical defects and solve the technical problem that the existing needle-free sealed infusion connector has insufficient airtightness, the purpose of the utility model is to provide a constant pressure needle-free infusion connector to solve the above technical problems.

[0004] The technical solution adopted by the utility model to solve the technical problem is as follows:

[0005] According to one aspect of the utility model, a constant pressure needle-free infusion connector is designed, comprising:

[0006] A shell body, which is composed of an upper shell body and a lower shell body connected together;

[0007] An upper silicone member is arranged in the upper shell, the upper silicone member has a sealing portion with a cutout on the top, a first annular portion on the upper end, and a second annular portion on the lower end, a tapered cavity, a first through hole and a first channel connected in sequence are arranged below the sealing portion, a limiting step for limiting the upward movement of the first annular portion is arranged in the upper shell, and the cutout can be opened when the top of the sealing portion is pressurized;

[0008] A flow guide, with a second through hole on the top and a side through hole connected to the second through hole on the side, the upper end of the flow guide is inserted into the first channel, and the lower end has a third annular portion, and a plurality of vertically penetrating flow guide notches are distributed on the outer circumference of the third annular portion;

[0009] A lower silicone member is disposed in the lower shell body, wherein the upper end of the lower silicone member has a confluence groove inside and a fourth annular portion outside, and the lower end has a liquid outlet hole connected to the confluence groove, wherein the confluence groove is connected to the side through hole through the guide notch, and the liquid outlet through hole is connected to the liquid outlet channel on the lower shell body, and the fourth annular portion is located between the second annular portion and the top of the lower shell body.

[0010] By adopting the above technical scheme, when the injection device (syringe, infusion set) is connected to the needle-free infusion connector for infusion, the liquid outlet end of the injection device is pressed against the sealing part on the top of the upper silicone liquid part to open the incision, and then inserted into the interior for infusion. When the liquid outlet end of the injection device is pulled out, due to the elastic properties of the silicone, the sealing part automatically rebounds and resets to a closed state, thereby ensuring the sealing of the needle-free infusion connector and preventing air embolism and bloodstream infection during use; by providing a conical cavity below the sealing part, when the sealing part is pressed and deformed downward, it can contact the conical surface of the conical cavity to limit its deformation, and when the liquid outlet end of the injection device is pulled out, its automatic rebound characteristics are not affected, thereby ensuring the sealing of the needle-free infusion connector is not affected; by providing a plurality of guide notches on the circumference of the guide member to connect the side through holes with the confluence groove, smooth flow of liquid can be ensured.

[0011] In order to better solve the above technical defects, the utility model also has a better technical solution:

[0012] In some embodiments, a slot and a plug-in portion are provided in the lower shell, the lower end of the lower silicone member is plugged into the slot, the plug-in portion is plugged into the liquid outlet through hole, and a connecting hole is provided on the plug-in portion to connect the liquid outlet through hole with the liquid outlet channel, so as to ensure a stable connection between the lower silicone member and the lower shell.

[0013] In some embodiments, the lower end periphery of the lower silicone member has a first annular protrusion with a conical structure.

[0014] In some embodiments, a first conical surface and a second conical surface are provided in the confluence groove, the third annular portion contacts the first conical surface, and an extension portion extending below the third annular portion contacts the second conical surface.

[0015] In some embodiments, the outer periphery of the lower silicone member has a second annular protrusion with a semicircular cross-section.

[0016] In some embodiments, the upper shell is provided with an external thread.

[0017] In some embodiments, the lower shell is provided with an internal thread. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1A structural schematic diagram of a constant pressure needle-free infusion connector according to an embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of a constant pressure needle-free infusion connector;

[0020] Figure 3 It is a schematic diagram of the explosion structure of the constant pressure needle-free infusion connector;

[0021] Figure 4 for Figure 3 A schematic diagram of the structure from another perspective;

[0022] Reference numerals:

[0023] 1. Shell; 11. Upper shell; 110. External thread; 111. Limiting step; 12. Lower shell; 120. Internal thread; 121. Liquid outlet channel; 122. Slot; 123. Plug-in portion; 1231. Connecting hole; 2. Upper silicone member; 21. Sealing portion; 210. Incision; 22. First annular portion; 23. Second annular portion; 24. Conical cavity; 25. First through hole; 26. First channel; 3. Guide member; 31. Second through hole; 32. Side through hole; 33. Third annular portion; 34. Guide notch; 35. Extension portion; 4. Lower silicone member; 41. Confluence groove; 42. Fourth annular portion; 43. Liquid outlet through hole; 44. First annular protrusion; 45. First conical surface; 46. Second conical surface; 47. Second annular protrusion. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0025] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0027] refer to Figures 1 to 4 As shown, the utility model provides a constant pressure needle-free infusion connector, comprising: a housing 1, an upper silicone member 2, a flow guide member 3, and a lower silicone member 4.

[0028] The housing 1 is composed of an upper housing 11 and a lower housing 12. The upper housing 11 is provided with an external thread 110, and the lower housing 12 is provided with an internal thread 120.

[0029] The upper silicone member 2 is made of elastic silicone material. The upper silicone member 2 is arranged in the upper shell 11. A sealing portion 21 is provided at the top of the upper silicone member 2. A cutout 210 is provided on the sealing portion 21. The cutout 210 passes through the sealing portion 21 from top to bottom. The upper end of the upper silicone member 2 has a first annular portion 22, and the lower end has a second annular portion 23. A conical cavity 24, a first through hole 25 and a first channel 26 that are connected in sequence are provided below the sealing portion 21. A limiting step 111 is provided in the upper shell 11 to limit the upward movement of the first annular portion 22. When the top of the sealing portion 21 is pressurized, the cutout 210 can be opened. When the pressure disappears, the cutout 210 automatically closes.

[0030] A second through hole 31 is provided on the top of the guide member 3, and a side through hole 32 is provided on the side. The side through hole 32 is connected to the second through hole 31. The upper end of the guide member 3 is inserted into the first channel 26, and its outer side wall abuts against the side wall of the first channel 26. The lower end of the guide member 3 has a third annular portion 33, and a plurality of vertically penetrating guide notches 34 are distributed on the outer circumference of the third annular portion 33.

[0031] The lower silicone member 4 is made of elastic silicone material and is arranged in the lower shell body 12. The upper end of the lower silicone member 4 has a confluence groove 41 inside, and the upper end of the lower silicone member 4 has a fourth annular portion 42 outside. The lower end of the lower silicone member 4 has a liquid outlet hole 43 connected to the confluence groove 41. The confluence groove 41 is connected to the side through hole 32 through the guide notch 34. The liquid outlet through hole 43 is connected to the liquid outlet channel 121 on the lower shell body 12. The fourth annular portion 42 is located between the second annular portion 23 and the top of the lower shell body 12.

[0032] The lower housing 12 is provided with a slot 122 and a plug-in portion 123. The slot 122 is an annular structure. The lower end of the lower silicone member 4 is plugged into the slot 122. The plug-in portion 123 is plugged into the liquid outlet through hole 43. The plug-in portion 123 is provided with a connecting hole 1231 that connects the liquid outlet through hole 43 with the liquid outlet channel 121. The lower end of the lower silicone member 4 has a first annular protrusion 44 with a conical structure.

[0033] The confluence groove 41 is provided with a first conical surface 45 and a second conical surface 46. The third annular portion 33 contacts the first conical surface 45, and the extension portion 35 extending below the third annular portion 33 contacts the second conical surface 46. The lower silicone member 4 has a second annular protrusion 47 with a semicircular cross section at the periphery of the middle portion.

[0034] The above are only some embodiments of the present invention. For ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A constant pressure needle-free infusion connector, characterized in that: include: A shell body, which is composed of an upper shell body and a lower shell body connected together; An upper silicone member is arranged in the upper shell, the upper silicone member has a sealing portion with a cutout on the top, a first annular portion on the upper end, and a second annular portion on the lower end, a tapered cavity, a first through hole and a first channel connected in sequence are arranged below the sealing portion, a limiting step for limiting the upward movement of the first annular portion is arranged in the upper shell, and the cutout can be opened when the top of the sealing portion is pressurized; A flow guide, with a second through hole on the top and a side through hole connected to the second through hole on the side, the upper end of the flow guide is inserted into the first channel, and the lower end has a third annular portion, and a plurality of vertically penetrating flow guide notches are distributed on the outer circumference of the third annular portion; A lower silicone member is disposed in the lower shell body, wherein the upper end of the lower silicone member has a confluence groove inside and a fourth annular portion outside, and the lower end has a liquid outlet hole connected to the confluence groove, wherein the confluence groove is connected to the side through hole through the guide notch, and the liquid outlet through hole is connected to the liquid outlet channel on the lower shell body, and the fourth annular portion is located between the second annular portion and the top of the lower shell body.

2. A constant pressure needle-free infusion connector according to claim 1, characterized in that: The lower shell body is provided with a slot and an inserting part, the lower end of the lower silicone member is inserted into the slot, the inserting part is inserted into the liquid outlet through hole, and the inserting part is provided with a connecting hole for connecting the liquid outlet through hole with the liquid outlet channel.

3. A constant pressure needle-free infusion connector according to claim 1 or 2, characterized in that: The lower end periphery of the lower silicone member is provided with a first annular protrusion of a conical structure.

4. A constant pressure needle-free infusion connector according to claim 1 or 2, characterized in that: A first conical surface and a second conical surface are provided in the confluence groove, the third annular portion contacts the first conical surface, and an extension portion extending below the third annular portion contacts the second conical surface.

5. The constant pressure needle-free infusion connector according to claim 1, characterized in that: The outer periphery of the lower silicone member is provided with a second annular protrusion with a semicircular cross section.

6. The constant pressure needle-free infusion connector according to claim 1, characterized in that: The upper shell is provided with external threads.

7. The constant pressure needle-free infusion connector according to claim 1, characterized in that: The lower shell body is provided with an internal thread.

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