Needle-free closed infusion connector

Abstract

The utility model discloses a needleless closed infusion connector. The needleless closed infusion connector comprises a shell, wherein the shell is formed by connecting an upper shell and a lower shell; the rubber plug is of an elastic structure and is arranged in the upper shell, the top of a first annular protrusion in the middle of the rubber plug abuts against a first limiting face in the upper shell, an inserting hole is formed in the lower end of the rubber plug, a notch is formed in the top of the rubber plug, and the notch can be opened when the top of the notch is pressed. The check ring is arranged at the lower end of the rubber plug, and the top face of the check ring abuts against the first annular protrusion. The upper end of the spring is inserted into the check ring, and the lower end elastically abuts against the lower shell; the liquid guide rod is of a hard structure and is provided with a through liquid guide channel, the upper end of the liquid guide rod is inserted into the insertion hole, the lower portion of the liquid guide rod is inserted into the insertion groove in the lower shell, the diameter of the upper end of the liquid guide rod is smaller than that of the insertion hole, and a liquid outlet channel communicated with the liquid guide channel is formed in the bottom of the insertion groove; by the adoption of the technical scheme, the sealing performance of the needle-free closed infusion connector is guaranteed, gas or an external pollution source is prevented from entering the needle-free closed infusion connector, and the use safety of the needle-free closed infusion connector is improved.

Description

Technical Field

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

[0002] Needle-free infusion 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 infusion connectors are suitable for connecting blood transfusion and infusion lines, but existing needle-free infusion 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 tightness of needle-free sealed infusion connectors is particularly important. If the tightness 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. Utility Model Content

[0003] In order to overcome the existing technical defects and solve the technical problem of poor sealing of the existing needle-free infusion connector, the purpose of the utility model is to provide a needle-free closed infusion connector to solve the above technical problem.

[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 needle-free closed infusion connector is designed, comprising:

[0006] The shell is composed of an upper shell and a lower shell connected together;

[0007] The rubber plug is an elastic structure and is arranged in the upper shell, and the top of the first annular protrusion in the middle of the rubber plug abuts against the first limit surface in the upper shell. The lower end of the rubber plug is provided with a plug hole, and the top is provided with a cutout in a sealed state and extending to the top of the plug hole. When the top of the cutout is pressed, the cutout can be opened;

[0008] A retaining ring, which is arranged at the lower end of the rubber plug and has a top surface abutting against the first annular protrusion;

[0009] A spring, the upper end of which is inserted into the retaining ring and elastically abuts against the annular portion at the upper end of the retaining ring, and the lower end of which elastically abuts against the lower shell;

[0010] The liquid guiding rod is a hard structure and is provided with a penetrating liquid guiding channel. The upper end of the liquid guiding rod is inserted into the insertion hole, and the lower part is inserted into the slot on the lower shell. The diameter of the upper end of the liquid guiding rod is smaller than the diameter of the insertion hole, and the bottom of the slot is provided with a liquid outlet channel connected to the liquid guiding channel.

[0011] By adopting the above technical solution, when the needle-free sealed infusion connector is not in use, the incision is in a closed and sealed state. When the injection device (syringe, infusion set) is connected to the upper end of the needle-free sealed infusion connector for infusion, the liquid outlet end of the injection device is pressed against the incision position at the top of the rubber plug to open the incision, and then inserted into the jack for infusion. When the liquid outlet end of the injection device is pulled out, the incision is automatically closed due to the elastic structure of the rubber plug, thereby ensuring the sealing of the needle-free sealed infusion connector, preventing gas or external pollution sources from entering the interior, and improving the safety of its use.

[0012] In order to better solve the above technical defects, the utility model also has a better technical solution:

[0013] In some embodiments, a tapered surface is provided at the lower end of the jack. By providing the tapered surface, the end of the liquid guide rod is easily inserted into the jack during the assembly of the needle-free closed infusion connector, thereby improving the assembly efficiency.

[0014] In some embodiments, an annular groove is provided on the upper portion of the lower shell, and the lower end of the spring is inserted into the annular groove.

[0015] In some embodiments, the upper end of the liquid-conducting channel is provided with a tapered slope, which facilitates the liquid entering the insertion hole to flow into the liquid-conducting channel.

[0016] In some embodiments, the upper end of the liquid guiding rod is inserted into the middle of the insertion hole.

[0017] In some embodiments, a second annular protrusion is provided at the lower end of the liquid guiding rod, and the second annular protrusion contacts the second limiting surface in the lower shell.

[0018] In some embodiments, a gap is maintained between the outer wall of the lower end of the plug and the inner wall of the upper shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a needle-free sealed infusion connector according to an embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the cross-sectional structure of a needle-free closed infusion connector;

[0021] Figure 3 It is a schematic diagram of the explosion structure of the needle-free closed infusion connector;

[0022] Reference numerals:

[0023] 1. Shell; 11. Upper shell; 111. First limiting surface; 12. Lower shell; 121. Annular groove; 122. Liquid outlet channel; 123. Second limiting surface; 2. Rubber plug; 21. First annular protrusion; 22. Insertion hole; 23. Conical surface; 24. Cutout; 3. Retaining ring; 31. Annular portion; 4. Spring; 5. Liquid guiding rod; 51. Liquid guiding channel; 52. Conical inclined surface; 53. 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, and fixing 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 3 As shown, the utility model provides a needle-free closed infusion connector, comprising: a housing 1, a rubber plug 2, a retaining ring 3, a spring 4 and a liquid guiding rod 5.

[0028] The housing 1 is composed of an upper shell 11 and a lower shell 12 connected together, wherein the upper shell 11 and the lower shell 12 are ultrasonically welded. The upper end of the upper shell 11 has an external thread, and the lower shell 12 has an internal thread.

[0029] The rubber plug 2 is an elastic structure, wherein the material of the rubber plug 2 is silicone or silicone rubber. The rubber plug 2 is arranged in the upper shell 11, and a gap is maintained between the outer wall of the lower end of the rubber plug 2 and the inner wall of the upper shell 11. A first annular protrusion 21 is provided in the middle of the rubber plug 2, and the top of the first annular protrusion 21 abuts against the first limiting surface 111 in the upper shell 11. A plug hole 22 is provided at the lower end of the rubber plug 2. The plug hole 22 is a blind hole structure, and a conical surface 23 is provided at the lower end of the plug hole 22. A cut 24 is provided at the top of the rubber plug 2, which is in a sealed state and extends to the top of the plug hole 22. When the top of the cut 24 is pressurized, the cut 24 can be opened.

[0030] The retaining ring 3 is arranged at the lower end of the rubber plug 2, and the top surface of the retaining ring 3 abuts against the bottom of the first annular protrusion 21. The retaining ring 3 is made of stainless steel, aluminum alloy, hard plastic, etc. The retaining ring 3 is an annular structure, and an annular portion 31 is provided on the inner side wall of the upper end. The upper end of the spring 4 is inserted into the retaining ring 3, and the upper end of the spring 4 elastically abuts against the annular portion 31 of the upper end of the retaining ring 3. The upper part of the lower shell 12 is provided with an annular groove 121, and the lower end of the spring 4 is inserted into the annular groove 121 and elastically abuts against the lower shell 12. The retaining ring 3 is provided to prevent the upper end of the spring 4 from elastically abutting against the rubber plug 2 directly, because there is a gap between the outer side wall of the lower end of the rubber plug 2 and the inner side wall of the upper shell 11. If the upper end of the spring 4 elastically abuts against the rubber plug 2 directly, when the top of the rubber plug 2 is compressed, its lower part may enter the spring 4, that is, the upper part of the spring 4 is placed in the gap between the rubber plug and the upper shell, resulting in the rubber plug 2 being unable to reset.

[0031] The liquid-guiding rod 5 is a hard structure, and the material of the liquid-guiding rod 5 is stainless steel or aluminum alloy or hard plastic or ceramic, etc. The liquid-guiding rod 5 is provided with a penetrating liquid-guiding channel 51, and the upper end of the liquid-guiding channel 51 is provided with a conical inclined surface 52. The liquid-guiding rod 5 is arranged in the spring 4, and the upper end of the liquid-guiding rod 5 is inserted into the middle of the plug hole 22, and the lower part of the liquid-guiding rod 5 is inserted into the slot on the lower shell 12. The diameter of the upper end of the liquid-guiding rod 5 is smaller than the diameter of the plug hole 22, thereby ensuring that the liquid-guiding rod 5 is in sealed contact with the rubber plug 2 to prevent the liquid from flowing out from the connection position between the two during infusion. A liquid outlet channel 122 connected to the liquid-guiding channel 51 is provided at the bottom of the slot.

[0032] A second annular protrusion 53 is provided at the lower end of the liquid guiding rod 5 , and the second annular protrusion 53 contacts the second limiting surface 123 in the lower shell 12 .

[0033] When the top of the incision 24 is pressurized, the incision 24 can be opened. After the incision 24 is opened, the incision 24, the insertion hole 22, the liquid guide channel 51 and the liquid outlet channel 122 form a connected straight-through structure, which is conducive to the smooth transportation of liquid during infusion.

[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 needle-free closed infusion connector, characterized in that: include: The housing (1) is composed of an upper housing (11) and a lower housing (12) connected together; The rubber plug (2) is an elastic structure and is arranged in the upper shell (11), and the top of the first annular protrusion (21) in the middle of the rubber plug (2) abuts against the first limit surface (111) in the upper shell (11). The lower end of the rubber plug (2) is provided with an insertion hole (22), and the top is provided with a cutout (24) in a sealed state and extending to the top of the insertion hole (22). When the top of the cutout (24) is pressurized, the cutout (24) can be opened; A retaining ring (3) is arranged at the lower end of the rubber plug (2), and its top surface abuts against the first annular protrusion (21); A spring (4), the upper end of which is inserted into the retaining ring (3) and elastically abuts against the annular portion (31) at the upper end of the retaining ring (3), and the lower end of which elastically abuts against the lower shell (12); The liquid guiding rod (5) is a hard structure and is provided with a penetrating liquid guiding channel (51). The upper end of the liquid guiding rod (5) is inserted into the insertion hole (22), and the lower part is inserted into the slot on the lower shell (12). The diameter of the upper end of the liquid guiding rod (5) is smaller than the diameter of the insertion hole (22), and the bottom of the slot is provided with a liquid outlet channel (122) connected with the liquid guiding channel (51).

2. The needle-free sealed infusion connector according to claim 1, characterized in that: The lower end of the insertion hole (22) is provided with a tapered surface (23).

3. A needle-free sealed infusion connector according to claim 1 or 2, characterized in that: The upper part of the lower shell (12) is provided with an annular groove (121), and the lower end of the spring (4) is inserted into the annular groove (121).

4. A needle-free sealed infusion connector according to claim 1 or 2, characterized in that: The upper end of the liquid guiding channel (51) is provided with a conical inclined surface (52).

5. A needle-free sealed infusion connector according to claim 1 or 2, characterized in that: The upper end of the liquid guiding rod (5) is inserted into the middle of the insertion hole (22).

6. A needle-free sealed infusion connector according to claim 1 or 2, characterized in that: A second annular protrusion (53) is provided at the lower end of the liquid-guiding rod (5), and the second annular protrusion (53) is in contact with a second limiting surface (123) in the lower shell (12).

7. A needle-free sealed infusion connector according to claim 1 or 2, characterized in that: A gap is maintained between the outer wall of the lower end of the rubber plug (2) and the inner wall of the upper shell (11).

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