CN215537103U

CN215537103U - Special needleless connector for central venous catheter

Info

Publication number: CN215537103U
Application number: CN202121258053.5U
Authority: CN
Inventors: 朱礼阳; 鲁美苏; 王红林; 杨瑾; 赵占正
Original assignee: First Affiliated Hospital of Zhengzhou University
Current assignee: First Affiliated Hospital of Zhengzhou University
Priority date: 2021-06-07
Filing date: 2021-06-07
Publication date: 2022-01-18
Anticipated expiration: 2031-06-07

Abstract

The utility model discloses a special needleless connector for a central venous catheter, which comprises a shell, a needle and a needle, wherein the shell is provided with an inner cavity; the first connecting end is arranged at one end of the shell, a first cavity channel is arranged on the inner side of the first connecting end, a connecting external thread is arranged on the outer side of the first connecting end, and the first cavity channel is a conical cavity channel and is communicated with the inner cavity of the shell; the elastic sealing valve core is arranged in the inner cavity of the shell, extends to the outer port of the first cavity channel, and is provided with a valve core channel which has a conduction state and a closing state; the second connecting end is arranged at the other end of the shell and is internally provided with a second cavity, and a connecting internal thread is arranged in the second cavity; and the butt joint channel is arranged in the second cavity channel, one end of the butt joint channel is communicated with the inner cavity of the shell, and the other end of the butt joint channel is in butt joint communication with the central venous catheter connecting pipe. The utility model has the advantages of improving the matching degree with the central venous catheter, the extracorporeal circulation pipeline for dialysis and the injector, and forming the needleless connector special for the central venous catheter.

Description

Special needleless connector for central venous catheter

Technical Field

The utility model relates to the technical field of hemodialysis, in particular to a needleless connector special for a central venous catheter used in hemodialysis.

Background

A hemodialysis patient needs to use a central venous catheter to be placed into a central vein to form a vascular access; the existing central venous catheter is formed by connecting a Y-shaped tee joint with a puncture tube with a puncture needle and two thicker and heavier connecting tubes, wherein the puncture tube penetrates into the body of a patient, and the two connecting tubes are left outside the body surface of the patient and are used for being connected with an extracorporeal circulation pipeline for dialysis or being butted with an injector for filling medicines.

When the central venous catheter connecting pipe is connected with an extracorporeal circulation pipeline for dialysis or an injector, blood loss caused by infection and poor connection is a common complication of the connecting pipe, so that in order to avoid blood loss caused by poor connection and reduce the occurrence of catheter infection, a needleless connector is required to be installed at the outer ends of the two connecting pipes of the central venous catheter in advance so as to be in threaded connection with the extracorporeal circulation pipeline for dialysis or in adaptive splicing communication with the injector.

However, no needle-free connector dedicated to the central venous catheter is available on the market, and most hospitals use a conventional needle-free infusion connector (as shown in fig. 1) as an alternative; the needleless infusion joint is used for ordinary infusion, liquid but not blood flows through the joint, unidirectional inflow is realized, and the flow rate is slow; when hemodialysis treatment is performed, the liquid flowing through the joint is the blood of a patient, the flow rate is high (generally 100-400 ml/min), and the liquid needs to flow in two directions. Therefore, in the using process, the needleless infusion connector can be easily screwed on the threaded connector at the outer end of the connecting pipe and can be easily connected with an extracorporeal circulation pipeline or an injector for dialysis, but the tightness of the injector in the inserting and connecting process is poor, the phenomena of connection loosening and disconnection are easily caused after repeated inserting and pulling, blood is splashed, and after long-time use, the phenomenon of thermal expansion and cold contraction can be caused in an internal cavity of the needleless infusion connector due to the fact that the blood has a certain temperature, and at the moment, the inserting and connecting end of the injector is more easily loosened and disconnected; meanwhile, because the length of the threaded connector end of the existing central venous catheter connecting pipe and the length of the threaded connector end of the extracorporeal circulation pipeline for dialysis are both longer, and the length of the two butt ends of the existing needle-free infusion connector is shorter, the needle-free infusion connector cannot form closed seamless butt joint with the central venous catheter connecting pipe and the extracorporeal circulation pipeline for dialysis, so that the joint is difficult to disinfect and bacteria are easy to breed; in addition, because the inside chamber of current needleless infusion joint says for zero pressure, consequently can't prevent effectively that tube sealing liquid from spilling over, especially after using a period, the elastic seal case in the needleless infusion joint easily takes place expend with heat and contract with cold, leads to the case passageway closed not tight, can't play good tube sealing protection effect, can only seal the pipe through the mode of changing the heparin cap, and the operation process is troublesome relatively, and the disinfection of being not convenient for, easily leads to the blood outflow pollution patient's gown in the small part connecting tube during the change.

Disclosure of Invention

The utility model aims to provide a special needleless connector for a central venous catheter.

In order to achieve the purpose, the utility model can adopt the following technical scheme:

the utility model discloses a special needleless connector for a central venous catheter, which comprises:

a housing having an interior cavity;

the first connecting end is arranged at one end of the shell, a first cavity channel which is used for being in adaptive insertion connection with the injector is arranged on the inner side of the first connecting end, a connecting external thread which is used for being in adaptive threaded connection with an extracorporeal circulation pipeline for dialysis is arranged on the outer side of the first connecting end, and the first cavity channel is a conical cavity channel with the inner diameter gradually reduced from the outside and is communicated with the inner cavity of the shell;

the elastic sealing valve core is arranged in the inner cavity of the shell, extends to the outer port of the first cavity channel, and is provided with a valve core channel which is in a conducting state when the extracorporeal circulation pipeline or the injector for dialysis is pressed and in a closed state when no pressing is performed;

the second connecting end is arranged at the other end of the shell opposite to the first connecting end, a second cavity matched and screwed with the central venous catheter connecting pipe is formed in the second connecting end, and a connecting internal thread is arranged in the second cavity; and

and the butt-joint channel is arranged in the second cavity channel, one end of the butt-joint channel is communicated with the inner cavity of the shell, and the other end of the butt-joint channel is in butt-joint communication with the central venous catheter connecting pipe inserted into the second cavity channel.

Furthermore, the length of the first connecting end is 0.5-0.6 cm, and the length of the second connecting end is 1-1.2 cm.

Furthermore, the diameter of the outer end of the first cavity is 0.4cm, and the diameter of the inner end of the first cavity is 0.35 cm.

Furthermore, an annular sealing rubber gasket tightly attached to the outer wall of the shell is sleeved at the inner end of the outer wall of the first connecting end.

Further, the internal connecting thread is located near the inner end of the second cavity.

Furthermore, a flexible sealing rubber gasket of a thin structure is arranged at the outer port of the second connecting end, and a penetrating port is formed in the flexible sealing rubber gasket.

The utility model has the advantages that the connection between the central venous catheter and the extracorporeal circulation pipeline or the injector for dialysis is realized by arranging the first connecting end and the second connecting end which are opposite to each other on the shell, and the elastic sealing valve core arranged in the shell can realize the conduction when the extracorporeal circulation pipeline or the injector for dialysis is connected and the closing when the extracorporeal circulation pipeline or the injector for dialysis is not connected, thereby ensuring that the extracorporeal circulation pipeline or the injector for dialysis can be easily butted and conducted with the central venous catheter and ensuring the sterility of the central venous catheter; in addition, the first cavity channel with the conical structure in the first connecting end can be tightly matched with the syringe inserted in the first cavity channel, so that the phenomenon of connection loosening or disconnection is reduced, and blood splashing is prevented; whole needleless connector can effectively avoid the tube sealing liquid to spill over, ensures good tube sealing protection effect, avoids sealing the pipe through the mode of changing the heparin cap, reduces the operation degree of difficulty, and the disinfection of being convenient for avoids blood reflux to cause the vascular access jam that founds or pollutes patient's gown, promotes the degree of matching with central ductus venosus, for dialysis extracorporeal circulation pipeline and syringe greatly, forms the needleless connector who is exclusively used in central ductus venosus.

Drawings

Fig. 1 is a structural schematic diagram of a prior needleless infusion joint.

Fig. 2 is a schematic structural diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the description in the present invention as referring to "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

As shown in fig. 2, the needleless connector for central venous catheter of the present invention comprises a housing 1, a first connection end 2, an elastic sealing valve core 3, a second connection end 4 and a docking channel 5.

Specifically, the shell 1 is internally provided with an inner cavity; the first connecting end 2 is arranged at one end of the shell 1, the length of the first connecting end is 0.5-0.6 cm and is matched with the length of a connecting end of an existing dialysis extracorporeal circulation pipeline which is common on the market, the outer side of the first connecting end 2 is provided with a connecting external thread 6 which is used for being in threaded connection with the dialysis extracorporeal circulation pipeline in a matching mode, the inner side of the first connecting end 2 is provided with a first cavity channel 7 which is used for being in plug-in connection with an injector in a matching mode, and the first cavity channel 7 is communicated with an inner cavity of the shell 1; in order to ensure that the injector inserted into the first cavity 7 can be tightly connected with the first cavity, the first cavity 7 is a conical cavity with gradually reduced inner diameter from outside to inside, the diameter of the outer end of the conical cavity is 0.4cm and is matched with the outer diameter of the injection head end of the conventional injector, and the diameter of the inner end of the conical cavity is 0.35cm, so that the injection head end of the injector can be gradually clamped, the injector is tightly matched and connected with the first cavity 7, the phenomenon that the injector and the first cavity 7 are loosened or disconnected is effectively reduced, and blood is prevented from being splashed outwards from the disconnected part in the using process. In addition, in order to enable the extracorporeal circulation pipeline for dialysis to be seamlessly connected to the first connecting end 2, the inner end of the outer wall of the first connecting end 2 is sleeved with an annular sealing rubber gasket 8 tightly attached to the outer wall of the shell 1, when the connecting end of the extracorporeal circulation pipeline for dialysis is in screwed connection with the first connecting end 2 in a matching mode, the end of the extracorporeal circulation pipeline for dialysis just abuts against the annular sealing rubber gasket 8, effective sealing is formed, the connecting end of the extracorporeal circulation pipeline for dialysis can be in seamless butt joint with the first connecting end 2, and meanwhile bacterial growth is effectively prevented.

The elastic sealing valve core 3 is arranged in the inner cavity of the shell 1 and extends to the outer port of the first cavity channel 7 (namely the elastic sealing valve core 3 is filled in the inner cavity of the shell 1 and the first cavity channel 7 of the first connecting end 2 and is matched with the shapes of the inner cavity of the shell 1 and the first cavity channel 7), the elastic sealing valve core 3 is provided with a valve core channel 9, the valve core channel 9 has a conducting state and a closed state, when the first connecting end 2 is connected with an extracorporeal circulation pipeline or an injector for dialysis, the elastic sealing valve core 3 is extruded, the valve core channel 9 is in the conducting state, when the first connecting end 2 is not connected, the elastic sealing valve core 3 is not extruded, the valve core channel 9 is in the closed state, the structure of the valve core is the same as that of the inner valve core of the conventional needleless infusion connector, and the central venous catheter connecting pipe X1 connected with the valve core can be protected, rendering it sterile.

The second connecting end 4 is arranged at the other end of the shell 1 opposite to the first connecting end 2, a second cavity 10 which is in matched threaded connection with the central venous catheter connecting pipe X1 is arranged in the second connecting end 4, and a connecting internal thread 11 is arranged in the second cavity 10; the length of the upper connecting section of the screwed joint X1.1 at the outer end of the central venous catheter connecting pipe X1 is about 1cm, so that the length of the second connecting end 4 is 1-1.2 cm, and the connecting section of the screwed joint X1.1 can be completely covered; in addition, because the thread on the screw joint X1.1 is arranged close to the outer side, the internal connecting thread 11 on the second connecting end 4 is correspondingly positioned close to the inner end of the second cavity 10, so that the second connecting end 4 can be in full-adapted seamless butt joint with the screw joint X1.1, and at this time, since a small gap is generated between the outer end of the second connecting end 4 and the screw joint X1.1, therefore, a flexible sealing rubber gasket 12 with a thin structure can be arranged at the outer port of the second connecting end 4, a through port 13 is arranged on the flexible sealing rubber gasket 12, thereby make spiro union joint X1.1 can shore flexible sealed cushion 12 when penetrating in second link 4, with flexible sealed cushion 12 pressfitting on the inner wall of second chamber 10, form further sealed protection, when guaranteeing second link 4 and spiro union joint X1.1 seamless butt joint, can effectively prevent bacterial growing.

The butt joint channel 5 is arranged in the second cavity 10, the butt joint channel 5 is coaxially arranged with the inner cavity of the shell 1, the first cavity 7, the elastic sealing valve core 3 and the second cavity 10, one end of the butt joint channel 5 is communicated with the inner cavity of the shell 1, and the other end of the butt joint channel is in butt joint communication with a central venous catheter connecting pipe X1 inserted into the second cavity 10. During the use, only need with this application needleless connector directly twist soon on central venous catheter, later alright light spiro union for dialysis external circulation pipeline or direct grafting syringe can effectively avoid sealing the pipe liquid and spill over when the operation of managing, ensures good tub protection effect of sealing, need not to adopt the mode of changing the heparin cap again to seal the pipe, reduces the operation degree of difficulty, and the disinfection of being convenient for avoids blood backward flow to cause the vascular access jam that founds, or blood outflow pollution patient's gown.

Claims

1. The special needleless connector for the central venous catheter is characterized in that: comprises that

A housing having an interior cavity;

the first connecting end is arranged at one end of the shell, a first cavity channel which is used for being in adaptive insertion connection with the injector is arranged at the inner side of the first connecting end, a connecting external thread which is used for being in adaptive threaded connection with the extracorporeal circulation pipeline connecting pipe for dialysis is arranged at the outer side of the first connecting end, and the first cavity channel is a conical cavity channel with the inner diameter gradually reduced from the outside and is communicated with the inner cavity of the shell;

2. The needleless connector for central venous catheters according to claim 1, wherein: the length of the first connecting end is 0.5-0.6 cm, and the length of the second connecting end is 1-1.2 cm.

3. The needleless connector for central venous catheters according to claim 2, wherein: the diameter of the outer end of the first cavity is 0.4cm, and the diameter of the inner end of the first cavity is 0.35 cm.

4. The needleless connector for the central venous catheter according to claim 2 or 3, wherein: and an annular sealing rubber gasket tightly attached to the outer wall of the shell is sleeved at the inner end of the outer wall of the first connecting end.

5. The needleless connector for the central venous catheter according to claim 2 or 3, wherein: the connecting internal thread is positioned at the position, close to the inner end, of the second cavity.

6. The needleless connector for central venous catheters according to claim 5, wherein: the outer port of the second connecting end is provided with a flexible sealing rubber mat with a thin structure, and a penetrating port is formed in the flexible sealing rubber mat.