Needleless infusion connecting piece

Abstract

The utility model provides a needleless transfusion connecting piece which comprises a connecting piece body, a silica gel valve and an exhaust film, a mounting cavity is formed in the connecting piece body, and the connecting piece body is provided with a liquid inlet end and a liquid outlet end; a liquid outlet communicated with the mounting cavity is formed in the liquid outlet end; an air vent is formed in the outer wall, close to the liquid inlet end, of the connecting piece body; the silica gel valve is at least partially arranged in the mounting cavity, a first infusion channel which is in a closed state in a normal state is arranged in the silica gel valve, and a first exhaust channel is defined between the outer wall of the silica gel valve and the inner wall of the mounting cavity; the first exhaust channel is communicated with the air vent; the exhaust film is arranged in the installation cavity and provided with a ventilation area and a circulation opening used for liquid circulation. The needleless infusion connecting piece can effectively solve the technical problem that in the prior art, when a needleless infusion connecting piece is used for infusion, medical staff need to manually exhaust an infusion pipeline indwelling in a blood vessel through the needleless infusion connecting piece before infusion.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of infusion device, concretely relates to a needleless infusion connecting piece. BACKGROUND

[0002] In prior art, the infusion connector clinically used by medical institutions is divided into puncture type connecting piece (heparin cap) and needleless connecting piece, since the needleless connecting piece can avoid using puncture needle when connecting infusion device, avoid the risk of needle stick injury of medical staff, and can save the use of consumables (puncture needle), simplify the operation steps, save the medical expenses of patients and improve the work efficiency of medical staff, therefore, the needleless connecting piece has been widely used in clinic.

[0003] However, since some air may be stored in the cavity of the needleless connecting piece type infusion connector and the pipeline cavity of the instrument in the indwelling blood vessel, in order to ensure that air embolism or the risk of air entering the patient's body does not occur during infusion, when using the needleless connecting piece for infusion, the needleless connecting piece type infusion connector needs to be operated for air exhaust, and infusion is carried out after ensuring that there is no air in the cavity of the needleless connecting piece type infusion connector and the pipeline cavity of the instrument in the indwelling blood vessel. However, the current air exhaust operation needs to be manually performed by medical staff, and in clinical practice, different infusion conditions may require different air exhaust operations, thereby increasing the work burden and operation complexity of medical staff. At the same time, manual air exhaust operation may increase the operation time, thereby reducing the work efficiency of medical staff. SUMMARY

[0004] The utility model aims at overcoming the above technical defects, and provides a needleless infusion connecting piece to solve the technical problem that in prior art, medical staff needs to manually exhaust the infusion pipeline in the indwelling blood vessel through the needleless infusion connecting piece before infusion when using the needleless connecting piece for infusion.

[0005] In order to achieve the above technical purpose, according to one aspect of the utility model: a needleless infusion connecting piece is provided, which comprises: a connecting piece body, a silica gel valve and an air exhaust film, the connecting piece body has an installation cavity inside, and the connecting piece body has a liquid inlet end and a liquid outlet end; the liquid outlet end is provided with a liquid outlet opening communicated with the installation cavity; a vent opening is arranged on the outer wall of the connecting piece body close to the liquid inlet end; the silica gel valve is at least partially arranged in the installation cavity, and the silica gel valve is provided with a first infusion channel in a closed state under normal conditions, and a first air exhaust channel is formed between the outer wall of the silica gel valve and the inner wall of the installation cavity; the first air exhaust channel is communicated with the vent opening; the air exhaust film is arranged in the installation cavity, and the air exhaust film has a gas permeable area and a flow opening for liquid flow, at least part of the gas permeable area is communicated with the first air exhaust channel, the flow opening is connected with the liquid outlet opening and the first infusion channel respectively, and the air exhaust film is used for blocking the liquid from entering the first air exhaust channel.

[0006] Further, the needle-free infusion connector further comprises an exhaust structure arranged in the mounting cavity; one end of the exhaust structure is connected to the one end of the silica gel valve close to the liquid outlet end, the other end of the exhaust structure is connected to the inner wall of the mounting cavity, and an installation groove is arranged on the end of the other end of the exhaust structure, an exhaust film is arranged in the installation groove, the exhaust structure has a second exhaust passage and a second infusion passage arranged at intervals, at least part of the air permeable area is in communication with the second exhaust passage, and the first exhaust passage is in communication with at least part of the air permeable area through the second exhaust passage; the second infusion passage is connected to the first infusion passage and the flow passage respectively; wherein the liquid outlet and the flow passage are arranged at intervals along the extension direction of the liquid inlet end to the liquid outlet end.

[0007] Further, the exhaust structure comprises a first flow shell and a second flow shell, the first flow shell is an annular shell, and the first flow shell surrounds a first flow passage; the second flow shell is arranged at the end of the first flow shell away from the silica gel valve, the second flow shell is an annular shell, and the second flow shell surrounds a second flow passage; the second flow passage is in communication with the first flow passage, and the second flow passage and the first flow passage form a second infusion passage.

[0008] Further, the exhaust structure further comprises a third flow shell and a connecting block, the third flow shell is sleeved on the one end of the first flow shell away from the silica gel valve, the third flow shell is an annular shell, and the third flow shell and the second flow shell are arranged at intervals; the third flow shell is arranged outside the second flow shell, so that the second exhaust passage is surrounded between the first flow shell and the second flow shell; the connecting block is connected to the first flow shell and the third flow shell respectively, the connecting block is a plurality of, the plurality of connecting blocks are arranged at intervals along the circumferential direction of the first flow shell, and every two adjacent connecting blocks in the plurality of connecting blocks and the first flow shell and the third flow shell surround a first exhaust passage, and the second exhaust passage is in communication with the first exhaust passage through the first exhaust passage.

[0009] Further, the one end of the third flow shell close to the liquid outlet end protrudes from the one end of the second flow shell close to the liquid outlet end; the inner wall of the third flow shell and the end of the second flow shell close to the liquid outlet end surround an installation groove; and the one end of the third flow shell close to the liquid outlet end is connected to the inner wall of the mounting cavity.

[0010] Further, the end of the liquid inlet end is provided with a mounting port in communication with the mounting cavity; the silica gel valve comprises a valve body and a first connecting portion, the valve body is provided with a first infusion passage, the valve body is mounted at the mounting port, and at least part of the valve body is located in the mounting cavity; a third flow passage is surrounded between the outer wall of the valve body and the inner wall of the mounting cavity; the first connecting portion is connected to the one end of the valve body away from the exhaust structure, the first connecting portion protrudes from the peripheral edge of the one end of the valve body away from the exhaust structure, and the first connecting portion is overlapped on the end of the liquid inlet end.

[0011] Further, the silica gel valve further comprises a second connecting part, the second connecting part is connected to the valve body near the one end of the exhaust structure, and the second connecting part is arranged on the periphery of the end of the valve body near the exhaust structure; a fourth flow-through channel is formed between the outer wall of the second connecting part and the inner wall of the mounting cavity, the fourth flow-through channel is communicated with the third flow-through channel, and the fourth flow-through channel and the third flow-through channel form a first exhaust channel; wherein, a groove is arranged on the end of the second connecting part near the exhaust structure, the exhaust structure is inserted into the groove near the one end of the silica gel valve, and the second connecting part is fixedly connected with the exhaust structure.

[0012] Further, the connecting piece body comprises: a liquid inlet pipe body and a liquid outlet pipe body connected in sequence, the liquid inlet pipe body and the liquid outlet pipe body are arranged in sequence along the extension direction from the liquid inlet end to the liquid outlet end, the end of the liquid inlet pipe body away from the liquid outlet pipe body is the liquid inlet end, and the liquid inlet pipe body is internally provided with a first placement cavity; the outer wall of the liquid inlet pipe body is provided with a vent; the end of the liquid outlet pipe body away from the liquid inlet pipe body is the liquid outlet end, and the liquid outlet pipe body is internally provided with a second placement cavity; the first placement cavity and the second placement cavity form the mounting cavity.

[0013] Further, the liquid inlet pipe body comprises: a first connecting pipe body and a second connecting pipe body, the end of the first connecting pipe body away from the liquid outlet pipe body is the liquid inlet end, the outer wall of the first connecting pipe body is provided with a vent, and the first connecting pipe body is internally provided with a first mounting channel; at least part of the valve body is located in the first mounting channel, and a third flow-through channel communicated with the vent is formed between the outer wall of the valve body and the inner wall of the first mounting channel; the second connecting pipe body is connected to the end of the first connecting pipe body near the liquid outlet pipe body; the second connecting pipe body is internally provided with a second mounting channel, at least part of the first connecting pipe body is inserted into the second mounting channel, the second mounting channel is communicated with the first mounting channel; the second connecting part is located in the second mounting channel, and a fourth flow-through channel is formed between the inner wall of the second mounting channel and the outer wall of the second connecting part; the second mounting channel and the first mounting channel form the first placement cavity; wherein, the end of the first connecting pipe body located in the second mounting channel is connected to the end of the second connecting part away from the exhaust structure; a communication groove is arranged on the end of the first connecting pipe body located in the second mounting channel, a second exhaust opening is formed between the communication groove and the second connecting part, and the third flow-through channel is communicated with the fourth flow-through channel through the second exhaust opening.

[0014] Further, the liquid outlet pipe body comprises a third connecting pipe body, a fourth flow shell and a connecting shell, the third connecting pipe body is connected with the second connecting pipe body away from the first connecting pipe body, a second placing cavity is arranged in the third connecting pipe body, an exhaust structure is connected with the inner wall of the second placing cavity away from the silica gel valve, the fourth flow shell is arranged at the end of the third connecting pipe body away from the second connecting pipe body, the fourth flow shell is an annular shell, the fourth flow shell surrounds a third infusion channel, the third infusion channel is in communication with the flow passage and the liquid outlet respectively, the liquid outlet is arranged on the end of the fourth flow shell away from the third connecting pipe body, and the connecting shell is arranged at the end of the third connecting pipe body away from the second connecting pipe body, the connecting shell is an annular shell, so the fourth flow shell is arranged in the connecting shell, and the connecting shell is arranged outside the fourth flow shell, so that an annular connecting cavity is formed between the connecting shell and the fourth flow shell.

[0015] According to the technical scheme of the utility model, the needle-free infusion connecting piece provided by the utility model is simple in structure, convenient to operate, and can effectively solve the technical problem that medical staff needs to manually exhaust the infusion pipeline in the indwelling blood vessel through the needle-free infusion connecting piece before infusion when the needle-free connecting piece is used for infusion. In addition, when the liquid inlet end is connected with the infusion channel, the air vent can be blocked through the infusion channel, so that liquid leakage and air entry can be avoided during the infusion process, thereby ensuring the sealing and safety of the infusion process. The needle-free infusion connecting piece is simple in structure, convenient to operate, and can effectively solve the technical problem that medical staff needs to manually exhaust the infusion pipeline in the indwelling blood vessel through the needle-free infusion connecting piece before infusion when the needle-free connecting piece is used for infusion. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A perspective view of an embodiment of the needleless infusion connector according to the present application is shown.

[0017] Figure 2 A first perspective view of an embodiment of the needleless infusion connector according to the present application is shown.

[0018] Figure 3 A second perspective view of an embodiment of the needleless infusion connector according to the present application is shown.

[0019] Figure 4 A first perspective view of an embodiment of the needleless infusion connector according to the present application is shown.

[0020] Figure 5 A structure view of an exhaust structure of an embodiment of the needleless infusion connector according to the present application is shown.

[0021] Figure 6 A structure view of an infusion tube body of an embodiment of the needleless infusion connector according to the present application is shown.

[0022] Among the above drawings, the following reference signs are included:

[0023] 1, connector body; 10, mounting cavity; 101, first placement cavity; 102, second placement cavity; 11, liquid inlet end; 110, air vent; 12, liquid outlet end; 120, liquid outlet; 121, mounting port; 13, liquid inlet tube body; 131, first connecting tube body; 1310, first mounting channel; 132, second connecting tube body; 1320, second mounting channel; 1321, communication groove; 14, liquid outlet tube body; 141, third connecting tube body; 142, fourth flow shell; 1420, third infusion channel; 143, connecting shell; 1430, internal thread; 144, connecting cavity; 2, silica gel valve; 20, first infusion channel; 21, first exhaust channel; 211, third flow-through channel; 212, fourth flow-through channel; 22, valve body; 23, first connecting portion; 24, second connecting portion; 25, groove; 3, exhaust structure; 30, second exhaust channel; 31, second infusion channel; 32, first flow shell; 320, first flow-through channel; 33, second flow shell; 330, second flow-through channel; 34, third flow shell; 35, connecting block; 36, first exhaust port; 37, mounting groove; 4, exhaust membrane; 40, air-permeable region; 41, flow-through port. DETAILED DESCRIPTION

[0024] In order to enable personnel in the technical field to better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor should belong to the scope of protection of the present application.

[0025] Please refer to Figures 1 to 6 According to the embodiment of the present application, a needle-free infusion connecting piece is provided, which comprises a connecting piece body 1, a silica gel valve 2 and an exhaust membrane 4. The connecting piece body 1 has an installation cavity 10 therein. The connecting piece body 1 has a liquid inlet end 11 and a liquid outlet end 12. The liquid outlet end 12 is provided with a liquid outlet 120 which is in communication with the installation cavity 10. The connecting piece body 1 is provided with a vent 110 on the outer wall close to the liquid inlet end 11. The silica gel valve 2 is at least partially arranged in the installation cavity 10. The silica gel valve 2 is provided with a first infusion channel 20 which is in a closed state in a normal state. The outer wall of the silica gel valve 2 and the inner wall of the installation cavity 10 form a first exhaust channel 21 therebetween. The first exhaust channel 21 is in communication with the vent 110. The exhaust membrane 4 is arranged in the installation cavity 10. The exhaust membrane 4 has a gas permeable area 40 and a flow port 41 for liquid flow. At least part of the gas permeable area 40 is in communication with the first exhaust channel 21. The flow port 41 is connected with the liquid outlet 120 and the first infusion channel 20, respectively. The exhaust membrane 4 is used to block the liquid from entering the first exhaust channel 21.

[0026] It can be seen that the needleless infusion connecting piece provided by the utility model has the connecting piece body 1, the silica gel valve 2 and the exhaust membrane 4, the outer wall of the connecting piece body 1 close to the liquid inlet end 11 is provided with the air vent 110, the silica gel valve 2 is internally provided with the first infusion channel 20 in a closed state under normal conditions, the outer wall of the silica gel valve 2 and the inner wall of the mounting cavity 10 form the first exhaust channel 21, and the first exhaust channel 21 is communicated with the air vent 110. Further, before the infusion is carried out, when the needleless infusion connecting piece and the pipeline of the instrument in the indwelling blood vessel are in the connected state, the air remaining in the cavity of the needleless infusion connecting piece and the pipeline cavity of the instrument in the indwelling blood vessel can be automatically exhausted out of the needleless infusion connecting piece through the first exhaust channel 21 and the air vent 110, thereby reducing the work burden of the medical staff, reducing the operation difficulty of the pipeline connection in the infusion treatment process, improving the efficiency of the pipeline connection in the infusion treatment process and improving the work efficiency of the medical staff. At the same time, the exhaust membrane 4 has the air permeation area 40 and the flow-through port 41 for liquid flow, at least part of the air permeation area 40 is communicated with the first exhaust channel 21, and the flow-through port 41 is connected with the liquid outlet 120 and the first infusion channel 20 respectively. Further, when the needleless infusion connecting piece and the pipeline of the instrument in the indwelling blood vessel are in the connected state, the air in the pipeline cavity of the instrument in the indwelling blood vessel can be sequentially exhausted out of the needleless infusion connecting piece through the air permeation area 40 of the exhaust membrane 4, the first exhaust channel 21 and the air vent 110, at the same time, if liquid remains in the pipeline cavity of the instrument in the indwelling blood vessel, the exhaust membrane 4 can block the liquid from flowing into the first exhaust channel 21 and can accurately control the liquid flow, thereby ensuring the stability and accuracy of the liquid delivery. In addition, when the liquid inlet end 11 is connected with the infusion channel, the air vent 110 can be blocked through the infusion channel, thereby avoiding the leakage of the medicine liquid and the entry of air during the infusion process, thereby ensuring the sealing property and safety of the infusion process. The needleless infusion connecting piece has the advantages of simple structure, convenient operation and effective solution to the technical problem that the medical staff needs to manually exhaust the infusion pipeline in the indwelling blood vessel through the needleless infusion connecting piece before the infusion in the prior art.

[0027] The exhaust membrane 4 is usually made of a specific part of a membrane material to realize the air permeation function. The membrane material is usually a porous structure and has a specific air permeation capacity but can effectively prevent the liquid from passing through.

[0028] In the actual working process, the exhaust membrane 4 is a hydrophobic membrane and can realize the liquid blocking effect while exhausting air.

[0029] In the specific implementation process, the one end of the silica gel valve 2 away from the exhaust structure 3 protrudes from the liquid inlet end, and the one end of the silica gel valve 2 away from the exhaust structure 3 overlaps on the end of the liquid inlet end, the one end of the silica gel valve 2 away from the exhaust structure 3 is the liquid inlet of the first liquid delivery channel 20, the liquid inlet of the first liquid delivery channel 20 is in a closed state in a normal state, and the liquid inlet of the first liquid delivery channel 20 and the liquid outlet of the first liquid delivery channel 20 are both in a "one" shape or a "cross" shape in the normal state. With such a structure, when the infusion device is inserted into the first liquid delivery channel 20, the first liquid delivery channel 20 can be more uniformly squeezed, thereby improving the service life of the silica gel valve 2 while enabling the liquid to smoothly pass through the first liquid delivery channel.

[0030] In actual work process, the silica gel valve 2 is a separation membrane.

[0031] In actual work process, the liquid outlet 120 of the connector body 1 of the needleless infusion connector is connected with the pipeline of the device in the indwelling blood vessel, after the connection, the air in the pipeline of the device in the indwelling blood vessel enters the mounting cavity 10 through the liquid outlet 120, and then the air in the mounting cavity 10 and the air in the pipeline of the device in the indwelling blood vessel are sequentially discharged out of the needleless infusion connector through the air-permeable area 40 of the exhaust membrane 4, the first exhaust channel 21 and the vent 110, when the exhaust is completed, the infusion device is sleeved on the needleless infusion connector, the vent 110 is blocked, at the same time, the infusion pipeline in the infusion device is inserted into the first liquid delivery channel 20 through the liquid inlet of the first liquid delivery channel 20, so that the first liquid delivery channel 20 is in a conductive state from a closed state, and the liquid in the infusion pipeline of the infusion device flows into the pipeline of the device in the indwelling blood vessel through the first liquid delivery channel 20, the flow-through opening 41 and the liquid outlet 120.

[0032] In the specific implementation process, as shown in Figures 1 to 4 The needleless infusion connector further comprises: an exhaust structure 3, the exhaust structure 3 is arranged in the mounting cavity 10; one end of the exhaust structure 3 is connected with the one end of the silica gel valve 2 close to the liquid outlet end 12, the other end of the exhaust structure 3 is connected with the inner wall of the mounting cavity 10, and the end of the other end of the exhaust structure 3 is provided with a mounting groove 37, the exhaust membrane 4 is arranged in the mounting groove 37, the exhaust structure 3 has a second exhaust channel 30 and a second liquid delivery channel 31 arranged at intervals, at least part of the air-permeable area 40 is communicated with the second exhaust channel 30, and the first exhaust channel 21 is communicated with at least part of the air-permeable area 40 through the second exhaust channel 30; the second liquid delivery channel 31 is connected with the first liquid delivery channel 20 and the flow-through opening 41 respectively; wherein the liquid outlet 120 and the flow-through opening 41 are arranged at intervals along the extension direction of the liquid inlet end 11 to the liquid outlet end 12.

[0033] In actual working process, the infusion pipeline in the infusion device is inserted into the first infusion channel 20 through the liquid inlet of the first infusion channel 20, so that the first infusion channel 20 is in the open state from the closed state, at this time, the first infusion channel 20 is in communication with the second infusion channel 31, and the first infusion channel 20 is in communication with the flow-through port 41 and the liquid outlet 120 through the second infusion channel 31.

[0034] In actual working process, the silica gel valve 2, the exhaust structure 3 and the exhaust film 4 are sequentially arranged along the extension direction from the liquid inlet end 11 to the liquid outlet end 12, and at least part of the silica gel valve 2, the exhaust structure 3 and the exhaust film 4 are located in the mounting cavity 10, the end of the exhaust structure 3 away from the silica gel valve 2 has a mounting groove 37 matched with the exhaust film 4, the exhaust film 4 is arranged in the mounting groove 37, and the exhaust film 4 is connected with the exhaust structure 3, and at the same time, the end of the exhaust structure 3 away from the silica gel valve 2 is connected with the mounting cavity 10.

[0035] In actual working process, the exhaust film 4 and the exhaust structure are connected by ultrasonic welding.

[0036] In the specific implementation process, as shown in Figures 2 to 5 , the exhaust structure 3 includes: a first flow shell 32 and a second flow shell 33, the first flow shell 32 is an annular shell, and the first flow shell 32 surrounds a first flow-through channel 320; the second flow shell 33 is arranged at the end of the first flow shell 32 away from the silica gel valve 2, the second flow shell 33 is an annular shell, and the second flow shell 33 surrounds a second flow-through channel 330; the second flow-through channel 330 is in communication with the first flow-through channel 320, and the second flow-through channel 330 and the first flow-through channel 320 form the second infusion channel 31.

[0037] In actual working process, the flow-through area of the first flow-through channel 320 gradually decreases along the extension direction from the liquid inlet end 11 to the liquid outlet end 12. Thus, the flow of liquid in the channel is accurately controlled, and the speed and distribution of the fluid are adjusted.

[0038] In the specific implementation process, as shown in Figures 2 to 5 , the exhaust structure 3 further includes: a third flow shell 34 and a connecting block 35, the third flow shell 34 is sleeved on the end of the first flow shell 32 away from the silica gel valve 2, the third flow shell 34 is an annular shell, and the third flow shell 34 and the second flow shell 33 are arranged at intervals; the third flow shell 34 is arranged outside the second flow shell 33, so that the first flow shell 32 and the second flow shell 33 surround the second exhaust channel 30; the connecting block 35 is connected with the first flow shell 32 and the third flow shell 34, respectively, the connecting block 35 is a plurality of, the plurality of connecting blocks 35 are arranged at intervals along the circumferential direction of the first flow shell 32, every two adjacent connecting blocks 35 in the plurality of connecting blocks 35 and the first flow shell 32 and the third flow shell 34 surround the first exhaust port 36, and the second exhaust channel 30 is in communication with the first exhaust channel 21 through the first exhaust port 36.

[0039] In actual work, the cross-sectional area of the flow-through port 41 is the same as that of the second flow-through channel 330, and at least part of the end of the second flow shell 33 away from the first flow shell 32 abuts at least part of the air-permeable area of the air exhaust film 4. With such a structure, when liquid flows from the second flow-through channel 330 to the flow-through port 41, it will not flow into the second air exhaust channel 30 through the gap between the air exhaust film 4 and the second flow shell 33.

[0040] In actual work, the first air exhaust channel 21 and the second air exhaust channel 30 are both annular channels, and the first air exhaust channel 21 communicates with the second air exhaust channel 30 through a plurality of first air exhaust ports 36.

[0041] In actual work, the air vent 110 is a plurality of air vents, and the plurality of air vents 110 are arranged at intervals along the circumferential direction of the connecting member body 1. Each air vent 110 communicates with the first air exhaust channel 21.

[0042] Preferably, the air vent 110 is 2.

[0043] In specific implementation, as shown in Figure 2 and Figure 4 , the third flow shell 34 protrudes from the end of the second flow shell 33 close to the liquid outlet 120; the inner wall of the third flow shell 34 and the end of the second flow shell 33 close to the liquid outlet 120 form an installation groove 37; and the end of the third flow shell 34 close to the liquid outlet 120 is connected to the inner wall of the installation cavity 10.

[0044] In actual work, the end of the third flow shell 34 close to the liquid outlet 120 is connected to the inner wall of the installation cavity 10 by adhesion or ultrasonic welding.

[0045] In this embodiment, as shown in Figures 1 to 4 , the end of the liquid inlet end 11 is provided with an installation port 121 communicating with the installation cavity 10; the silica gel valve 2 comprises a valve body 22 and a first connecting portion 23, the valve body 22 is provided with a first liquid delivery channel 20, the valve body 22 is installed at the installation port 121, and at least part of the valve body 22 is located in the installation cavity 10; the outer wall of the valve body 22 and the inner wall of the installation cavity 10 form a third flow-through channel 211; the first connecting portion 23 is connected to the end of the valve body 22 away from the air exhaust structure 3, the first connecting portion 23 protrudes from the peripheral edge of the end of the valve body 22 away from the air exhaust structure 3, and the first connecting portion 23 is lapped on the end of the liquid inlet end 11.

[0046] In actual work process, the installation port 121 is in interference fit with the valve body 22, so that a certain pressure can be applied to the outer wall of the valve body through the installation port 121, thereby the clamping effect on the valve body 22 can be achieved, so as to improve the self-sealing property of the silica gel valve 2, prevent gas from entering the second infusion channel 31 from the first infusion channel 20 when the needleless infusion connector is not connected with the infusion device, and at the same time, prevent bacteria from entering.

[0047] In the specific implementation process, as shown in Figures 1 to 4 , the silica gel valve 2 further comprises: a second connecting portion 24 connected with the valve body 22 near one end of the exhaust structure 3, the second connecting portion 24 is protrudingly arranged on the periphery of the end of the valve body 22 near the exhaust structure 3; a fourth flow-through channel 212 is formed between the outer wall of the second connecting portion 24 and the inner wall of the installation cavity 10, the fourth flow-through channel 212 is in communication with the third flow-through channel 211, and the fourth flow-through channel 212 and the third flow-through channel 211 form the first exhaust channel 21; wherein, a groove 25 is arranged on the end of the second connecting portion 24 near the exhaust structure 3, one end of the exhaust structure 3 near the silica gel valve 2 is inserted into the groove 25, and the second connecting portion 24 is fixedly connected with the exhaust structure 3.

[0048] In actual work process, the end of the valve body 22 near the exhaust structure 3 is located in the second infusion channel, and the end face of the end of the exhaust structure 3 away from the exhaust membrane 4 is fixedly bonded with the end face of the silica gel valve 2 (i.e. the end face of the end of the exhaust structure 3 away from the exhaust membrane 4 and the inner wall of the groove 25) by medical-grade glue, so that when the first infusion channel 20 is in the conducting state, the liquid flowing out of the first infusion channel 20 can smoothly enter the second infusion channel 31. At the same time, by arranging the end of the valve body 22 near the exhaust structure 3 in the second infusion channel 31, the clamping effect on the valve body 22 can be achieved, so as to improve the self-sealing property of the silica gel valve 2, prevent gas from entering the second infusion channel 31 from the first infusion channel 20 when the needleless infusion connector is not connected with the infusion device, and at the same time, prevent bacteria from entering.

[0049] In the embodiment, as shown in Figures 1 to 4 , the connector body 1 comprises: a liquid inlet pipe body 13 and a liquid outlet pipe body 14 connected in sequence, the liquid inlet pipe body 13 and the liquid outlet pipe body 14 are arranged in sequence along the extension direction of the liquid inlet end 11 to the liquid outlet end 12, the end of the liquid inlet pipe body 13 away from the liquid outlet pipe body 14 is the liquid inlet end 11, and the first placement cavity 101 is arranged in the liquid inlet pipe body 13; the outer wall of the liquid inlet pipe body 13 is provided with a vent 110; the end of the liquid outlet pipe body 14 away from the liquid inlet pipe body 13 is the liquid outlet end 12, and the second placement cavity 102 is arranged in the liquid outlet pipe body 14; the first placement cavity 101 and the second placement cavity 102 form the installation cavity 10.

[0050] In actual work, the first connecting pipe body 131 is connected with the second connecting pipe body 132.

[0051] In actual work, the first connecting pipe body 131 is connected with the second connecting pipe body 132.

[0052] In actual work, the first connecting pipe body 131 is connected with the second connecting pipe body 132.

[0053] In actual work, the first connecting pipe body 131 is connected with the second connecting pipe body 132. Figures 1 to 4 Figure 6 In actual work, the first connecting pipe body 131 is connected with the second connecting pipe body 132.

[0054] In actual work, the first connecting pipe body 131 is connected with the second connecting pipe body 132.

[0055] ​In actual work process, the second connecting pipe body 132 is an annular pipe body, and the plurality of communication grooves 1321 are arranged at intervals along the circumferential direction of the second connecting pipe body 132. Each communication groove 1321 and the second connecting portion 24 form a second exhaust port, and the third flow passage 211 communicates with the fourth flow passage 212 through the plurality of second exhaust ports.

[0056] In the specific implementation process, as shown in Figures 1 to 4 The liquid outlet pipe body 14 includes a third connecting pipe body 141, a fourth flow shell 142, and a connecting shell 143. The third connecting pipe body 141 is connected to the end of the second connecting pipe body 132 away from the first connecting pipe body 131, and the second placing cavity 102 is arranged in the third connecting pipe body 141. The end of the exhaust structure 3 away from the silica gel valve 2 is connected to the inner wall of the second placing cavity 102. The fourth flow shell 142 is arranged at the end of the third connecting pipe body 141 away from the second connecting pipe body 132. The fourth flow shell 142 is an annular shell, and the third infusion passage 1420 is formed in the fourth flow shell 142. The third infusion passage 1420 communicates with the flow port 41 and the liquid outlet 120, respectively. The liquid outlet 120 is arranged at the end of the fourth flow shell 142 away from the third connecting pipe body 141. The connecting shell 143 is arranged at the end of the third connecting pipe body 141 away from the second connecting pipe body 132. The connecting shell 143 is an annular shell, so the fourth flow shell 142 and the connecting shell 143 are arranged at intervals. The connecting shell 143 is arranged outside the fourth flow shell 142, so that the annular connecting cavity 144 is formed between the connecting shell 143 and the fourth flow shell 142.

[0057] In actual work process, the third connecting pipe body 141 is provided with a second plug-in portion.

[0058] In actual work process, the shell of the connector of the vascular indwelling device is inserted into the connecting cavity 144, and the infusion pipeline in the connector of the vascular indwelling device is inserted into the third infusion passage 1420.

[0059] In the specific implementation process, as shown in Figure 4 The inner wall of the connecting shell 143 is provided with an internal thread 1430 for threadedly connecting with the connector of the vascular indwelling device.

[0060] In actual work process, the end of the fourth flow shell 142 away from the liquid inlet pipe body 13 protrudes from the end of the connecting shell 143 away from the liquid inlet pipe body 13. The fourth flow shell 142 is used for being inserted into the pipeline of the vascular indwelling device. The connecting shell 143 is sleeved on the connector of the vascular indwelling device, and is threadedly connected with the external thread of the connector of the vascular indwelling device, so as to be locked and fixed.

[0061] The exhaust process and the infusion process of the needleless infusion connector are as follows:

[0062] Exhaust process: the needleless infusion connector is first connected with the connector of the device left in the blood vessel, the fourth flow shell 142 is first inserted into the pipeline of the blood vessel left device from the end of the liquid inlet pipe body 13, the outer thread of the connector of the blood vessel left device is screwed with the inner thread 1430, so as to be locked and fixed, then the air in the pipeline of the device left in the blood vessel after connection enters the third infusion channel 1420 through the liquid outlet, then enters the second exhaust channel 30 through the air permeable area of the exhaust membrane 4, then enters the first exhaust channel 21 through the plurality of first exhaust ports 36, and is discharged through the air vent 110 until the exhaust action is completed.

[0063] Infusion process: after the exhaust is completed, the infusion device is sleeved on the first connecting pipe body 131 (i.e. the connector body 1), the air vent 110 is blocked, at the same time, the infusion pipeline of the infusion device is inserted into the first infusion channel 20 through the liquid inlet of the first infusion channel 20, so that the first infusion channel 20 is in a conductive state from a closed state, and the liquid in the infusion pipeline of the infusion device flows into the pipeline of the device left in the blood vessel in sequence through the first infusion channel 20, the second infusion channel 31, the flow port 41, the third infusion channel 1420 and the liquid outlet 120.

[0064] The needleless infusion connector provided by the utility model, the needleless infusion connector comprises a connector body 1, a silica gel valve 2 and an exhaust membrane 4, the connector body 1 has an installation cavity 10, the connector body 1 has a liquid inlet end 11 and a liquid outlet end 12, the liquid outlet end 12 is provided with a liquid outlet 120 in communication with the installation cavity 10, the outer wall of the connector body 1 close to the liquid inlet end 11 is provided with an air vent 110, the silica gel valve 2 is at least partially arranged in the installation cavity 10, the silica gel valve 2 is provided with a first infusion channel 20 in a closed state in a normal state, a first exhaust channel 21 is formed between the outer wall of the silica gel valve 2 and the inner wall of the installation cavity 10, the first exhaust channel 21 is in communication with the air vent 110, the exhaust membrane 4 is arranged in the installation cavity 10, the exhaust membrane 4 has an air permeable area 40 and a flow port 41 for liquid flow, at least part of the air permeable area 40 is in communication with the first exhaust channel 21, the flow port 41 is connected with the liquid outlet 120 and the first infusion channel 20 respectively, and the exhaust membrane 4 is used for blocking the liquid from entering the first exhaust channel 21.

[0065] It can be seen that the needleless infusion connecting piece provided by the utility model has the following advantages: the connecting piece body 1, the silica gel valve 2 and the exhaust membrane 4 are simply arranged, the outer wall of the connecting piece body 1 close to the liquid inlet end 11 is provided with the air vent 110, the silica gel valve 2 is internally provided with the first infusion channel 20 in a closed state under normal conditions, and the outer wall of the silica gel valve 2 and the inner wall of the mounting cavity 10 form the first exhaust channel 21; the first exhaust channel 21 is communicated with the air vent 110. Furthermore, before infusion is carried out, and when the needleless infusion connecting piece and the pipeline of the instrument in the indwelling blood vessel are in a connected state, the air remaining in the cavity of the needleless infusion connecting piece and the pipeline cavity of the instrument in the indwelling blood vessel can be automatically exhausted out of the needleless infusion connecting piece from the first exhaust channel 21 and the air vent 110, thereby reducing the work burden of medical staff and reducing the operation difficulty of pipeline connection in the infusion treatment process, improving the efficiency of pipeline connection in the infusion treatment process, and improving the work efficiency of medical staff. At the same time, the exhaust membrane 4 has the air permeation area 40 and the flow-through port 41 for liquid flow, at least part of the air permeation area 40 is communicated with the first exhaust channel 21, and the flow-through port 41 is connected with the liquid outlet 120 and the first infusion channel 20 respectively. Furthermore, when the needleless infusion connecting piece and the pipeline of the instrument in the indwelling blood vessel are in a connected state, the air in the pipeline cavity of the instrument in the indwelling blood vessel can be sequentially exhausted out of the needleless infusion connecting piece through the air permeation area 40 of the exhaust membrane 4, the first exhaust channel 21 and the air vent 110, and at the same time, if liquid remains in the pipeline cavity of the instrument in the indwelling blood vessel, the exhaust membrane 4 can block the liquid from flowing into the first exhaust channel 21, and the liquid flow can be accurately controlled, thereby ensuring the stability and accuracy of liquid delivery. In addition, when the liquid inlet end 11 is connected with the infusion channel, the air vent 110 can be blocked through the infusion channel, and during the infusion process, liquid leakage and air entry can be avoided, thereby ensuring the sealing property and safety of the infusion process. The needleless infusion connecting piece has simple structure and convenient operation, and can effectively solve the technical problem that medical staff needs to manually exhaust the infusion pipeline in the indwelling blood vessel through the needleless infusion connecting piece before infusion in the prior art.

[0066] It should be noted that the terms "first", "second" and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the use of these terms is interchangeable under appropriate circumstances such that the descriptive

[0067] Optionally, the specific examples in the embodiments can refer to the examples described in the above embodiments, and the embodiments will not be described here again.

[0068] The sequence numbers of the above-described embodiments of the present application are only for description, and do not represent the advantages or disadvantages of the embodiments.

[0069] In the above-described embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0070] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A needleless infusion connector comprising: The needleless infusion connector comprises: a connector body (1) having a mounting cavity (10) therein, the connector body (1) having a liquid inlet end (11) and a liquid outlet end (12); a liquid outlet (120) is arranged at the liquid outlet end (12) and communicates with the mounting cavity (10); a vent hole (110) is arranged on the outer wall of the connector body (1) close to the liquid inlet end (11); a silica gel valve (2) arranged at least partially in the mounting cavity (10), the silica gel valve (2) having a first infusion passage (20) in a closed state in a normal state, a first exhaust passage (21) being formed between the outer wall of the silica gel valve (2) and the inner wall of the mounting cavity (10); the first exhaust passage (21) communicates with the vent hole (110); an exhaust membrane (4) arranged in the mounting cavity (10), the exhaust membrane (4) having a gas-permeable area (40) and a flow-through opening (41) for liquid flow, at least part of the gas-permeable area (40) communicating with the first exhaust passage (21), the flow-through opening (41) being connected with the liquid outlet (120) and the first infusion passage (20) respectively, the exhaust membrane (4) being arranged to block the liquid from entering the first exhaust passage (21).

2. The needle-free infusion connector of claim 1, wherein, The needleless infusion connector further comprises an exhaust structure (3) arranged in the mounting cavity (10); one end of the exhaust structure (3) is connected with the end of the silica gel valve (2) close to the liquid outlet end (12), the other end of the exhaust structure (3) is connected with the inner wall of the mounting cavity (10), and an installation groove (37) is arranged on the end of the other end of the exhaust structure (3), the exhaust membrane (4) is arranged in the installation groove (37), the exhaust structure (3) has a second exhaust passage (30) and a second infusion passage (31) arranged at intervals, at least part of the gas-permeable area (40) communicates with the second exhaust passage (30), the first exhaust passage (21) communicates with at least part of the gas-permeable area (40) through the second exhaust passage (30); the second infusion passage (31) is connected with the first infusion passage (20) and the flow-through opening (41) respectively; wherein the liquid outlet (120) and the flow-through opening (41) are arranged at intervals along the extension direction from the liquid inlet end (11) to the liquid outlet end (12).

3. The needle-free infusion connector of claim 2, wherein, The exhaust structure (3) comprises: a first flow shell (32) which is an annular shell, the first flow shell (32) forming a first flow-through passage (320); A second flow shell (33) is arranged at an end of the first flow shell (32) away from the silica gel valve (2), the second flow shell (33) is an annular shell, and the second flow shell (33) surrounds a second flow passage (330); the second flow passage (330) communicates with the first flow passage (320), and the second flow passage (330) and the first flow passage (320) form the second infusion passage (31).

4. The needle-free infusion connector of claim 3, wherein, The exhaust structure (3) further comprises: A third flow shell (34) is sleeved on an end of the first flow shell (32) away from the silica gel valve (2), the third flow shell (34) is an annular shell, and the third flow shell (34) and the second flow shell (33) are arranged at intervals; the third flow shell (34) is arranged outside the second flow shell (33) to surround the second exhaust passage (30) between the first flow shell (32) and the second flow shell (33); A connecting block (35) is connected with the first flow shell (32) and the third flow shell (34) respectively, the connecting block (35) is a plurality of connecting blocks (35) arranged at intervals along the circumferential direction of the first flow shell (32), and every two adjacent connecting blocks (35) in the plurality of connecting blocks (35) surround a first exhaust port (36) between the first flow shell (32) and the third flow shell (34), and the second exhaust passage (30) communicates with the first exhaust passage (21) through the first exhaust port (36).

5. The needle-free infusion connector of claim 4, wherein, An end of the third flow shell (34) close to the liquid outlet (120) protrudes from an end of the second flow shell (33) close to the liquid outlet (120); an inner wall of the third flow shell (34) and an end of the second flow shell (33) close to the liquid outlet (120) surround the mounting groove (37); and an end of the third flow shell (34) close to the liquid outlet (120) is connected with an inner wall of the mounting cavity (10).

6. The needle-free infusion connector of claim 3, wherein, An end of the liquid inlet end (11) is provided with a mounting port (121) communicating with the mounting cavity (10); the silica gel valve (2) comprises: A valve body (22) is provided with the first infusion passage (20), the valve body (22) is mounted at the mounting port (121), and at least part of the valve body (22) is located in the mounting cavity (10); an outer wall of the valve body (22) and an inner wall of the mounting cavity (10) surround a third flow passage (211); A first connecting portion (23) is connected with an end of the valve body (22) away from the exhaust structure (3), the first connecting portion (23) protrudes from the periphery of the end of the valve body (22) away from the exhaust structure (3), and the first connecting portion (23) is overlapped on the end of the liquid inlet end (11).

7. The needle-free infusion connector of claim 6, wherein, The silica gel valve (2) further comprises a second connecting part (24) connected to one end of the valve body (22) close to the exhaust structure (3), the second connecting part (24) is arranged protruding from the periphery of the end of the valve body (22) close to the exhaust structure (3); a fourth flow passage (212) is formed between the outer wall of the second connecting part (24) and the inner wall of the mounting cavity (10), the fourth flow passage (212) communicates with the third flow passage (211), and the fourth flow passage (212) and the third flow passage (211) form the first exhaust passage (21); Wherein, the second connecting part (24) is provided with a groove (25) on the end close to the exhaust structure (3), the exhaust structure (3) is inserted into the groove (25) close to one end of the silica gel valve (2), and the second connecting part (24) is fixedly connected with the exhaust structure (3).

8. The needle-free infusion connector of claim 7, wherein, The connecting piece body (1) comprises: a liquid inlet pipe body (13) and a liquid outlet pipe body (14) connected in sequence, the liquid inlet pipe body (13) and the liquid outlet pipe body (14) are arranged in sequence along the extension direction from the liquid inlet end (11) to the liquid outlet end (12), one end of the liquid inlet pipe body (13) away from the liquid outlet pipe body (14) is the liquid inlet end (11), and the liquid inlet pipe body (13) is provided with a first placement cavity (101); the outer wall of the liquid inlet pipe body (13) is provided with the air vent (110); one end of the liquid outlet pipe body (14) away from the liquid inlet pipe body (13) is the liquid outlet end (12), and the liquid outlet pipe body (14) is provided with a second placement cavity (102); the first placement cavity (101) and the second placement cavity (102) form the mounting cavity (10).

9. The needle-free infusion connector of claim 8, wherein, The liquid inlet pipe body (13) comprises: A first connecting pipe body (131), one end of the first connecting pipe body (131) away from the liquid outlet pipe body (14) is the liquid inlet end (11), the outer wall of the first connecting pipe body (131) is provided with the air vent (110), and the first connecting pipe body (131) is provided with a first mounting passage (1310); at least part of the valve body (22) is located in the first mounting passage (1310), and the outer wall of the valve body (22) and the inner wall of the first mounting passage (1310) form the third flow passage (211) communicating with the air vent (110); A second connecting pipe body (132) is connected to the first connecting pipe body (131) near one end of the liquid outlet pipe body (14); a second mounting channel (1320) is arranged in the second connecting pipe body (132), at least part of the first connecting pipe body (131) is arranged in the second mounting channel (1320), the second mounting channel (1320) is in communication with the first mounting channel (1310); the second connecting part (24) is arranged in the second mounting channel (1320), the fourth flow channel (212) is formed between the inner wall of the second mounting channel (1320) and the outer wall of the second connecting part (24); the second mounting channel (1320) and the first mounting channel (1310) form the first placing cavity (101); The end of the first connecting pipe body (131) arranged in the second mounting channel (1320) is connected to the end of the second connecting part (24) away from the exhaust structure (3); the end of the first connecting pipe body (131) arranged in the second mounting channel (1320) is provided with a communication groove (1321), the second exhaust port is formed between the communication groove (1321) and the second connecting part (24), the third flow channel (211) is in communication with the fourth flow channel (212) through the second exhaust port.

10. The needle-free infusion connector of claim 9, wherein, The liquid outlet pipe body (14) comprises: A third connecting pipe body (141) is connected to the second connecting pipe body (132) away from the first connecting pipe body (131), the second placing cavity (102) is arranged in the third connecting pipe body (141); the end of the exhaust structure (3) away from the silica gel valve (2) is connected to the inner wall of the second placing cavity (102); A fourth flow shell (142) is arranged at the end of the third connecting pipe body (141) away from the second connecting pipe body (132), the fourth flow shell (142) is a ring-shaped shell, the fourth flow shell (142) forms a third infusion channel (1420), the third infusion channel (1420) is in communication with the flow port (41) and the liquid outlet (120) respectively; the fourth flow shell (142) is provided with the liquid outlet (120) at the end thereof away from the third connecting pipe body (141); A connecting shell (143) is arranged at the end of the third connecting pipe body (141) away from the second connecting pipe body (132), the connecting shell (143) is a ring-shaped shell, so the fourth flow shell (142) and the connecting shell (143) are arranged at intervals, the connecting shell (143) is arranged on the outer side of the fourth flow shell (142), so that the connecting shell (143) and the fourth flow shell (142) form a ring-shaped connecting cavity (144).

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