Remaining needle for dialysis

Abstract

The invention provides an indwelling needle for dialysis, the indwelling needle for dialysis comprises a catheter assembly, a needle tube assembly and a protection assembly, the catheter assembly is provided with a liquid channel; the needle tube assembly is provided with a needle tube, and the needle tube is movably arranged in the liquid channel in a penetrating mode. The protection assembly is detachably connected with the catheter assembly, and the protection assembly is provided with a connecting port and a first channel communicated with the connecting port; at least part of the needle tube is located in the first channel; wherein the protection assembly is provided with a shielding part and a first inserting part, when the needle tube is arranged in the liquid channel in a penetrating mode, the shielding part avoids the connecting opening, and the first inserting part is connected with the outer wall of the catheter assembly; when the puncture end of the needle tube is limited in the first channel, the shielding part blocks the connecting opening, and the first inserting part is separated from the outer wall of the catheter assembly. The remaining needle for dialysis is simple in structure, convenient to operate and capable of effectively solving the technical problem that in the prior art, a remaining needle for dialysis has the risk that medical staff and patients are punctured after puncture.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to an indwelling needle for dialysis. Background Art

[0002] In the existing technology, dialysis indwelling needles have gradually been used as a substitute for traditional internal fistula needles (arteriovenous puncture devices) because of their advantages such as short blood access time, low risk of internal fistula complications, better patient comfort and mobility, and wide range of applications. This change not only reduces the operating risks of nurses, but also improves the treatment effect and the overall experience of patients.

[0003] However, there are still some problems with the dialysis catheters currently on the market. For example, medical staff are required to manually exhaust air after puncture, which reduces their work efficiency. There is also a risk of needle injuring medical staff and patients after puncture, which may lead to blood contamination and cause harm to the health of medical staff and patients. Summary of the invention

[0004] The purpose of the present invention is to overcome the above technical deficiencies and provide a dialysis indwelling needle to solve the technical problem that the dialysis indwelling needle in the prior art has the risk of needle sticking injuries to medical staff and patients after puncture.

[0005] To achieve the above technical objectives, according to one aspect of the present invention: a dialysis indwelling needle is provided, the dialysis indwelling needle comprises: a catheter assembly, a needle tube assembly and a protective assembly, the catheter assembly has a liquid channel; the needle tube assembly has a needle tube, and the needle tube is movably arranged in the liquid channel; the protective assembly is detachably connected to the catheter assembly, the protective assembly has a connecting port and a first channel connected to the connecting port; at least part of the needle tube is located in the first channel; wherein the protective assembly has a shielding portion and a first plug-in portion, when the needle tube is arranged in the liquid channel, the shielding portion avoids the connecting port, and the first plug-in portion is connected to the outer wall of the catheter assembly; when the puncture end of the needle tube is restricted in the first channel, the shielding portion blocks the connecting port, and the first plug-in portion is separated from the outer wall of the catheter assembly.

[0006] Furthermore, a limiting portion is provided in the first channel, the limiting portion is located at one end of the first channel away from the connecting port, and the limiting portion is arranged toward the axial direction of the needle tube; a protrusion is provided on the outer wall of the needle tube, the protrusion is close to the puncture end of the needle tube, and the protrusion is used to abut against the limiting portion; wherein, when the protrusion abuts against the limiting portion, the puncture end of the needle tube is restricted within the first channel.

[0007] Furthermore, the protection component also includes: a protection shell and a partition plate, the protection shell has a first installation cavity; the partition plate is arranged in the first installation cavity, so as to separate the first installation cavity into a first placement cavity and a first channel through the partition plate, and the first placement cavity is located at one end of the first channel close to the connecting port; a connecting port is provided on the partition plate, and the first channel is connected to the first placement cavity through the connecting port; the shielding part is located in the first channel; the first placement cavity is used to place the liquid inlet end of the catheter assembly; wherein, at least part of the first plug-in part is movably arranged in the first placement cavity, and when the liquid inlet end of the catheter assembly is located in the first placement cavity and the shielding part avoids the connecting port, the first plug-in part is connected to the outer wall of the catheter assembly.

[0008] Furthermore, the first channel includes a first lumen, a second lumen and a third lumen that are interconnected, and the first lumen, the second lumen and the third lumen are arranged in sequence, and one end of the first lumen is connected to the connecting port; the shielding portion is located in the first lumen; wherein the diameter of the second lumen is greater than the diameter of the third lumen; the end wall of the third lumen is close to one end of the second lumen to form a limiting portion, and when the protrusion abuts against the end wall of the third lumen close to one end of the second lumen, the puncture end of the needle tube is limited to the first lumen or the second lumen.

[0009] Furthermore, the protection component also includes: a connecting structure, the elastic part of the connecting structure is movably arranged in the first channel, and the elastic part is respectively connected to the shielding part and the first plug-in part; wherein the elastic part has a compression state and a recovery state, when the needle tube is inserted into the liquid channel, the elastic part is in a compression state, the elastic part drives the shielding part to avoid the connecting port, and the elastic part drives the first plug-in part to connect with the outer wall of the catheter assembly; when the puncture end of the needle tube is restricted in the first channel, the elastic part is in a recovery state, the elastic part drives the shielding part to block the connecting port, and the elastic part drives the first plug-in part to separate from the outer wall of the catheter assembly.

[0010] Furthermore, the connecting structure includes a first fixed plate, a first elastic plate, a second elastic plate, a third elastic plate and a connecting plate which are connected in sequence, the first fixed plate is fixed on the inner wall of the first channel, one end of the first fixed plate is connected to one end of the first elastic plate, the other end of the first elastic plate is connected to one end of the second elastic plate, the other end of the second elastic plate is connected to one end of the third elastic plate, the other end of the third elastic plate is connected to one end of the connecting plate, and the other end of the connecting plate is connected to the first plug-in portion through the partition plate; the shielding portion is arranged on the side wall of the third elastic plate, and the shielding portion is arranged in the direction of the first fixed plate; wherein, along the distribution direction of the first elastic plate and the second elastic plate, the second elastic plate is curved; an avoidance groove is provided on the partition plate, the avoidance groove is spaced apart from the connecting port, and one end of the connecting plate away from the third elastic plate is connected to the first plug-in portion through the avoidance groove; and at least a part of the connecting plate is movably arranged in the avoidance groove.

[0011] Furthermore, the catheter assembly includes: a catheter, a catheter seat, a clamping hose, a connector and a needle-free infusion connector connected in sequence along an extension direction from the liquid outlet end of the catheter assembly to the liquid inlet end of the catheter assembly, an end of the catheter away from the catheter seat to form the liquid outlet end of the catheter assembly, and an end of the needle-free infusion connector away from the connector to form the liquid inlet end of the catheter assembly; wherein the liquid channel includes a first liquid flow channel and a second liquid flow channel, the first liquid flow channel is located in the needle-free infusion connector; the needle-free infusion connector also has a gas flow channel spaced apart from the first liquid flow channel, and at least part of the first liquid flow channel and the gas flow channel are connected to the second liquid flow channel.

[0012] Furthermore, the needle-free infusion connector includes: a first connector body, a first silicone valve, a first exhaust membrane and an exhaust structure, the first connector body has a second installation cavity, and the first connector body is provided with a first connecting port connected with the second liquid circulation channel and the second installation cavity respectively at one end close to the connector; a first vent is provided on the outer wall of the first connector body at one end away from the connector; the first silicone valve is at least partially arranged in the second installation cavity, and a first infusion channel which is in a closed state under normal conditions is provided in the first silicone valve, and a first exhaust channel is formed between the outer wall of the first silicone valve and the inner wall of the second installation cavity; the first exhaust channel is connected with the first vent; the first exhaust membrane is arranged in the second installation cavity, and the first exhaust membrane has a first breathable area and a circulation port for liquid circulation. At least part of the first air permeable area is connected to the first exhaust channel, the circulation port is respectively connected to the first communication port and the first infusion channel, and the first exhaust membrane is used to prevent liquid from entering the first exhaust channel; the exhaust structure is arranged in the second installation cavity; one end of the exhaust structure is connected to an end of the first silicone valve close to the first communication port, the other end of the exhaust structure is connected to the inner wall of the second installation cavity, and an installation groove is provided on the end of the other end of the exhaust structure, the first exhaust membrane is arranged in the installation groove, the exhaust structure has a second exhaust channel and a second infusion channel arranged at intervals, at least part of the first air permeable area is connected to the second exhaust channel, and the first exhaust channel is connected to at least part of the first air permeable area through the second exhaust channel; the second infusion channel is respectively connected to the circulation port and the first infusion channel.

[0013] Further, the needle-free infusion connector includes: a second connector body, a second silicone valve and a second exhaust membrane, wherein a fourth installation cavity and a fluid channel connected to each other are provided in the second connector body, and the fourth installation cavity and the fluid channel are sequentially arranged along the direction from the liquid inlet end of the catheter assembly to the liquid outlet end of the catheter assembly; a second connecting port connected to the second liquid circulation channel and the fourth installation cavity is provided on the end surface of the second connector body away from the fluid channel; a second vent connected to the fluid channel is provided on the outer wall of the second connector body close to the fluid channel; the second silicone valve is installed in the fourth installation cavity, and a third infusion channel in a closed state under normal conditions is provided in the second silicone valve; a third exhaust channel connected to the second connecting port and the fluid channel is formed between the outer wall of the second silicone valve and the inner wall of the fourth installation cavity; the second exhaust membrane is arranged in the fourth installation cavity, and the second exhaust membrane is sleeved on the second silicone valve; the outer wall of the second exhaust membrane abuts against the inner wall of the fourth installation cavity, and the second exhaust membrane is interference fit with the second silicone valve; the second exhaust membrane has a second air permeable area connected to the third exhaust channel, and the second air permeable area is used to block liquid from entering the third exhaust channel.

[0014] Furthermore, the needle tube assembly also includes: a needle seat and an exhaust member, the needle seat having a third installation cavity and a blood return cavity that are connected, at least a portion of the needle tube is inserted in the third installation cavity to connect the needle tube to the needle seat through the third installation cavity; one end of the exhaust member is inserted in the blood return cavity from the end of the needle seat away from the needle tube to seal the blood in the needle seat; and the exhaust member is used to exhaust the dialysis indwelling needle before the needle is removed.

[0015] Beneficial effects:

[0016] By applying the technical solution of the present invention, the indwelling needle for dialysis provided by the present invention is provided with a catheter assembly, a needle tube assembly and a protective assembly, and the needle tube in the needle tube assembly is at least partially located in the first channel in the protective assembly, and then the needle tube sequentially passes through the first channel and the connecting port and is movably arranged in the liquid channel. The protective assembly has a shielding portion and a first plug-in portion. When the needle tube is arranged in the liquid channel, the shielding portion avoids the connecting port. At the same time, the first plug-in portion is connected to the outer wall of the catheter assembly, and then the protective assembly is connected to the catheter assembly, and the first plug-in portion is used to improve the connection tightness between the protective assembly and the catheter assembly, ensuring that when the needle tube punctures the blood vessel, the protective assembly is firmly connected to the catheter assembly. At the same time, when the puncture end of the needle tube is limited in the first channel, the shielding portion blocks the connecting port, and at the same time, the first plug-in portion is separated from the outer wall of the catheter assembly. It can be seen that during the needle withdrawal process, when the puncture end of the needle moves into the first channel, the first plug-in portion is separated from the outer wall of the catheter assembly, so that the protective component and the catheter assembly can be disassembled, and when the shielding portion blocks the connection port, the puncture end of the needle can be restricted in the first channel, and the protective component forms a physical barrier to the puncture end of the needle, thereby effectively preventing the puncture end of the needle from contacting the external environment when withdrawing from the catheter assembly, reducing the risk of the puncture end of the needle stabbing medical staff and patients. And effectively limit the movement range of the puncture end of the needle and avoid the influence of external substances on the needle, thereby improving the safety of dialysis operations and reducing possible infection risks. In addition, by setting up a needle-free infusion connector, when the needle is removed, the air in the liquid channel will pass through the first connecting port, the first breathable area and the first exhaust channel in turn to reach the first vent, and be discharged through the first vent, thereby automatically completing the exhaust operation, thereby reducing the workload of medical staff and reducing the operational difficulty of pipeline connection during infusion therapy, improving the efficiency of pipeline connection during infusion therapy, and improving the work efficiency of medical staff. At the same time, the first exhaust membrane can block the liquid from flowing into the first exhaust channel, and can accurately control the flow of liquid, thereby ensuring the stability and accuracy of liquid delivery. In addition, when the needle-free infusion connector is connected to the infusion device, the first vent can be blocked by the shell of the infusion device, thereby preventing liquid leakage and air from entering during the infusion process. The dialysis indwelling needle has a simple structure and is easy to operate. It can effectively solve the technical problems in the prior art that the dialysis indwelling needle has the risk of injuring medical staff and patients after puncture, and the technical problem that the medical staff needs to manually exhaust the air after puncture, thereby reducing the work efficiency of the medical staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of an embodiment of a dialysis indwelling needle according to the present invention is shown;

[0018] Figure 2 A schematic structural diagram of an embodiment of a dialysis indwelling needle according to the present invention without a protective cover and butterfly wings is shown;

[0019] Figure 3 A schematic diagram showing a first viewing angle of a catheter assembly in an embodiment of a dialysis indwelling needle according to the present invention;

[0020] Figure 4 A schematic diagram from a second perspective of a catheter assembly in an embodiment of a dialysis indwelling needle according to the present invention is shown;

[0021] Figure 5 A schematic diagram showing the connection between the protection component and the needle tube component when the puncture end of the needle tube in the embodiment of the dialysis indwelling needle according to the present invention is located in the first channel;

[0022] Figure 6 A schematic structural diagram of a connection structure of an embodiment of a dialysis indwelling needle according to the present invention is shown;

[0023] Figure 7 A schematic diagram showing the shielding portion of the embodiment of the dialysis indwelling needle according to the present invention avoiding the connection port;

[0024] Figure 8 A schematic diagram showing the blocking portion of the embodiment of the dialysis indwelling needle according to the present invention blocking the connection port;

[0025] Fig. 9 A schematic structural diagram of a protective housing in an embodiment of a dialysis indwelling needle according to the present invention is shown;

[0026] Fig.10 A schematic structural diagram of a first embodiment of a needle-free infusion connector in an embodiment of a dialysis indwelling needle according to the present invention is shown;

[0027] Fig.11 A schematic diagram showing the structure of the third mounting cavity of the needle seat in the embodiment of the dialysis indwelling needle according to the present invention being blocked by needle glue;

[0028] Fig.12 A schematic structural diagram of a second embodiment of a needle-free infusion connector in an embodiment of a dialysis indwelling needle according to the present invention is shown.

[0029] The above drawings include the following reference numerals:

[0030] 1. catheter assembly; 10. liquid channel; 101. first liquid circulation channel; 102. second liquid circulation channel; 103. liquid inlet end; 104. liquid outlet end; 11. catheter; 110. first circulation channel; 12. catheter seat; 120. second circulation channel; 13. clamping hose; 130. third circulation channel; 14. connector; 140. fourth circulation channel; 15. needleless infusion connector; 150. gas circulation channel; 151. first connector body; 1500. second mounting cavity; 1510. first communication port; 1511. first vent; 152, first silicone valve; 1520, first infusion channel; 1521, first exhaust channel; 153, first exhaust membrane; 1530, first air permeable area; 1531, circulation port; 154, exhaust structure; 1541, second exhaust channel; 1542, second infusion channel; 1543, first flow shell; 15420, fifth circulation channel; 1544, second flow shell; 15430, sixth circulation channel; 1540, mounting groove; 2, protection component; 20, connection port; 21, first channel; 211, first lumen; 212, second lumen; 213 , third tube cavity; 22, shielding part; 23, first plug-in part; 210, limit part; 24, protective shell; 240, first installation cavity; 2401, first placement cavity; 241, first shell; 242, second shell; 243, third shell; 2430, avoidance cavity; 25, partition plate; 251, avoidance groove; 26, connecting structure; 260, elastic part; 261, first fixing plate; 262, first elastic plate; 263, second elastic plate; 264, third elastic plate; 265, connecting plate; 266, second fixing plate; 27, support plate; 28, limit Part; 3, needle tube assembly; 31, needle tube; 310, puncture end; 311, protrusion; 313, side hole; 32, needle seat; 321, third installation cavity; 322, blood return cavity; 33, exhaust part; 4, needle glue; 5, protective cover; 6, butterfly wing; 160, second connecting part body; 1600, fourth installation cavity; 1601, fluid channel; 1602, second connecting port; 1603, second vent; 1605, third exhaust channel; 161, second silicone valve; 1610, third infusion channel; 162, second exhaust membrane; 1620, second breathable area. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0032] See also Figures 1 to 12 According to an embodiment of the present invention, a dialysis indwelling needle is provided, which includes: a catheter assembly 1, a needle tube assembly 3 and a protective assembly 2, wherein the catheter assembly 1 has a liquid channel 10; the needle tube assembly 3 has a needle tube 31, and the needle tube 31 is movably arranged in the liquid channel 10; the protective assembly 2 is detachably connected to the catheter assembly 1, and the protective assembly 2 has a connecting port 20 and a first channel 21 connected to the connecting port 20; at least part of the needle tube 31 is located in the first channel 21; wherein the protective assembly 2 has a shielding portion 22 and a first plug-in portion 23, when the needle tube 31 is arranged in the liquid channel 10, the shielding portion 22 avoids the connecting port 20, and the first plug-in portion 23 is connected to the outer wall of the catheter assembly 1; when the puncture end 310 of the needle tube 31 is restricted in the first channel 21, the shielding portion 22 blocks the connecting port 20, and the first plug-in portion 23 is separated from the outer wall of the catheter assembly 1.

[0033] It can be seen that the dialysis indwelling needle provided by the present invention is provided with a catheter assembly 1, a needle assembly 3 and a protective assembly 2, and the needle tube 31 in the needle assembly 3 is at least partially located in the first channel 21 in the protective assembly 2, and then the needle tube 31 sequentially passes through the first channel 21 and the connecting port 20 and is movably arranged in the liquid channel 10. At the same time, the protective assembly 2 has a shielding portion 22 and a first plug-in portion 23. When the needle tube 31 is arranged in the liquid channel 10, the shielding portion 22 avoids the connecting port 20. At the same time, the first plug-in portion 23 is connected to the outer wall of the catheter assembly 1, and then the protective assembly 2 is connected to the catheter assembly 1, and the connection tightness of the protective assembly 2 and the catheter assembly 1 is improved by the first plug-in portion, ensuring that when the needle tube punctures the blood vessel, the protective assembly 2 is firmly connected to the catheter assembly 1. In addition, when the puncture end 310 of the needle tube 31 is limited in the first channel 21, the shielding portion 22 blocks the connecting port 20, and at the same time, the first plug-in portion 23 is separated from the outer wall of the catheter assembly 1. It can be seen that during the needle withdrawal process, when the puncture end 310 of the needle tube 31 moves into the first channel 21, the first plug-in portion 23 is separated from the outer wall of the catheter assembly 1, so that the protective component 2 and the catheter assembly 1 can be disassembled, and when the shielding portion 22 blocks the connecting port 20, the puncture end 310 of the needle tube 31 can be limited to the first channel 21, and the protective component forms a physical barrier for the puncture end 310 of the needle tube 31, thereby effectively preventing the puncture end 310 of the needle tube 31 from contacting the external environment when withdrawing from the catheter assembly 1, reducing the risk of the puncture end 310 of the needle tube 31 stabbing medical staff and patients. And effectively limit the movement range of the puncture end 310 of the needle tube 31 and avoid the influence of external substances on the needle, thereby improving the safety of the dialysis operation and reducing the possible infection risk. The dialysis indwelling needle has a simple structure and is easy to operate, and can effectively solve the technical problem of the risk of the dialysis indwelling needle in the prior art that there is a risk of the needle stabbing medical staff and patients after puncture.

[0034] Specifically, when the dialysis indwelling needle is not in use, the liquid inlet end 103 of the catheter assembly 1 is connected to one end of the protection assembly 2, and the other end of the protection assembly 2 is connected to at least part of the needle assembly 3; the puncture end 310 of the needle tube 31 is inserted into the first channel 21 from the other end of the protection assembly 2, and passes through the first channel 21, the connecting port 20 and the liquid channel 10 in sequence, so that the puncture end 310 of the needle tube 31 protrudes from the liquid inlet end 103 of the catheter assembly 1. At the same time, the shielding part 22 abuts against the outer wall of the needle tube 31, so that the shielding part 22 avoids the connecting port 20, and at the same time, the first plug-in part 23 is connected to the outer wall of the catheter assembly 1 to ensure the firmness of the connection between the protection assembly 2 and the catheter assembly 1.

[0035] Specifically, when a puncture operation is required, the puncture end 310 of the needle tube 31 punctures into the patient's blood vessel and drives the liquid inlet end 103 of the catheter assembly 1 into the patient's blood vessel. After the puncture is completed, the needle is withdrawn.

[0036] When withdrawing the needle, first, the puncture end 310 of the needle tube 31 is withdrawn from the patient's blood vessel. At the same time, at least a portion of the needle tube assembly 3 is separated from the protective assembly 2. Then, the puncture end 310 of the needle tube 31 is withdrawn into the first channel 21 through the liquid channel 10 and the connecting port 20 in sequence. When the puncture end 310 of the needle tube 31 enters the first channel 21, the shielding portion 22 blocks the connecting port 20. At the same time, the first plug-in portion 23 is separated from the outer wall of the catheter assembly 1, thereby restricting the puncture end 310 of the needle tube 31 within the first channel 21 and separating the protective assembly 2 and the catheter assembly 1 to complete the needle withdrawal operation.

[0037] Specifically, the liquid inlet end 103 of the catheter assembly 1 has a second plug-in portion adapted to the first plug-in portion 23 , and when the shielding portion 22 avoids the connecting port 20 , the first plug-in portion is plug-fitted with the second plug-in portion.

[0038] Specifically, a limiting portion 210 is provided in the first channel 21, the limiting portion 210 is located at one end of the first channel 21 away from the connecting port 20, and the limiting portion 210 is arranged toward the axial direction of the needle tube 31; a protrusion 311 is provided on the outer wall of the needle tube 31, the protrusion 311 is close to the puncture end 310 of the needle tube 31, and the protrusion 311 is used to abut against the limiting portion 210; wherein, when the protrusion 311 abuts against the limiting portion 210, the puncture end 310 of the needle tube 31 is restricted in the first channel 21. With such a structural arrangement, when the needle tube 31 continues to move in a direction away from the catheter assembly 1, the puncture end 310 of the needle tube 31 can be prevented from being separated from the protective assembly 2, further reducing the risk of the puncture end 310 of the needle tube 31 stabbing medical staff and patients.

[0039] In this embodiment, the protection component 2 also includes: a protection shell 24 and a partition plate 25, the protection shell 24 has a first installation cavity 240; the partition plate 25 is arranged in the first installation cavity 240, so as to separate the first installation cavity 240 into a first placement cavity 2401 and a first channel 21 through the partition plate 25, and the first placement cavity 2401 is located at one end of the first channel 21 close to the connection port 20; the partition plate 25 is provided with a connection port 20, and the first channel 21 is connected to the first placement cavity 2401 through the connection port 20; the shielding portion 22 is located in the first channel 21; the first placement cavity 2401 is used to place the liquid inlet end 103 of the catheter assembly 1; wherein, at least part of the first plug-in portion 23 is movably arranged in the first placement cavity 2401, and when the liquid inlet end 103 of the catheter assembly 1 is located in the first placement cavity 2401 and the shielding portion 22 avoids the connection port 20, the first plug-in portion 23 is connected to the outer wall of the catheter assembly 1.

[0040] Specifically, the first channel 21 includes a first tubular cavity 211, a second tubular cavity 212 and a third tubular cavity 213 which are interconnected. The first tubular cavity 211, the second tubular cavity 212 and the third tubular cavity 213 are arranged in sequence, and one end of the first tubular cavity 211 is connected to the connecting port 20; the shielding portion 22 is located in the first tubular cavity 211; wherein the diameter of the second tubular cavity 212 is greater than the diameter of the third tubular cavity 213; the end wall of the third tubular cavity 213 at one end close to the second tubular cavity 212 is used to form a limiting portion 210, and when the protrusion 311 abuts against the end wall of the third tubular cavity 213 at one end close to the second tubular cavity 212, the puncture end 310 of the needle tube 31 is limited to the first tubular cavity 211 or the second tubular cavity 212.

[0041] Specifically, depending on the setting position of the protrusion 311 and the actual operation conditions, when the protrusion 311 abuts against the end wall of the third lumen 213 close to the second lumen 212, the puncture end 310 of the needle tube 31 may be located in the first lumen 211 or in the second lumen 212.

[0042] Specifically, there are at least two protrusions 311, and the plurality of protrusions 311 are arranged at intervals along the circumferential direction of the needle tube 31. Preferably, there are two protrusions 311, and the two protrusions 311 are arranged correspondingly.

[0043] Specifically, the protective shell 24 includes: a first shell 241 and a second shell 242 connected in sequence, the first shell 241 is located at a side of the partition plate 25 away from the catheter assembly 1, and the second shell 242 is located at a side of the partition plate 25 close to the catheter assembly 1.

[0044] Specifically, the first housing 241 has a second tube cavity 212 and a third tube cavity 213 that are interconnected. The second housing 242 has a first accommodating cavity, and at least part of the partition plate 25 is disposed in the first accommodating cavity, so that the first accommodating cavity is separated into a first cavity and a second cavity by the partition plate 25. The second cavity forms a first placement cavity 2401.

[0045] Specifically, Figure 2 , Figures 5 to 9 As shown, the protective shell 24 also includes: a third shell 243, the third shell 243 is located on the outer wall of the second shell 242, and the third shell 243 has a second accommodating cavity, and the second accommodating cavity is respectively connected to the first accommodating cavity. One side of the partition plate 25 extends toward the second accommodating cavity, so that the second accommodating cavity is divided into a third cavity and a fourth cavity through the partition plate 25. An observation portion is provided on one side of the third shell 243 away from the outer wall of the second shell 242, so as to observe whether the puncture end 310 of the needle tube 31 reaches the first tube cavity 211 during the needle withdrawal process, and whether the shielding portion 22 blocks the connecting port 20.

[0046] Specifically, the first cavity and the third cavity form a first tubular cavity 211 , and the fourth cavity is an avoidance cavity 2430 .

[0047] In this embodiment, if Figure 2 , Figures 5 to 9 As shown, the protection component 2 also includes: a connecting structure 26, an elastic portion 260 of the connecting structure 26 is movably arranged in the first channel 21, and the elastic portion 260 is respectively connected to the shielding portion 22 and the first plug-in portion 23; wherein the elastic portion 260 has a compressed state and a restored state, when the needle tube 31 is inserted into the liquid channel 10, the elastic portion 260 is in a compressed state, the elastic portion 260 drives the shielding portion 22 to avoid the connecting port 20, and the elastic portion 260 drives the first plug-in portion 23 to connect with the outer wall of the catheter component 1; when the puncture end 310 of the needle tube 31 is restricted in the first channel 21, the elastic portion 260 is in a restored state, the elastic portion 260 drives the shielding portion 22 to block the connecting port 20, and the elastic portion 260 drives the first plug-in portion 23 to separate from the outer wall of the catheter component 1.

[0048] Specifically, when the needle tube 31 is inserted into the liquid channel 10, the needle tube 31 applies a certain force to the elastic part 260, so that the elastic part 260 is squeezed, and the elastic part 260 is in a compressed state. When the elastic part 260 is in a compressed state, at least part of the elastic part 260 abuts against the outer wall of the needle tube 31, and the elastic part 260 drives the shielding part 22 to move away from the connecting port 20, so that the shielding part 22 avoids the connecting port 20, and at the same time, the elastic part 260 also drives the first plug part 23 to connect with the outer wall of the catheter assembly 1.

[0049] Specifically, the elastic part 260 is in the recovery state when the puncture end 310 of the needle tube 31 is confined in the first channel 21, and the force applied by the needle tube 31 to the elastic part 260 disappears, so that the elastic part 260 recovers according to its own recovery elastic force. During the recovery process of the elastic part 260, the elastic part 260 drives the shielding part 22 to move toward the direction close to the connecting port 20, so that the shielding part 22 blocks the connecting port 20, and at the same time, the elastic part 260 also drives the first plug part 23 to separate from the outer wall of the catheter assembly 1.

[0050] Specifically, the connection structure 26 includes a first fixing plate 261, a first elastic plate 262, a second elastic plate 263, a third elastic plate 264 and a connecting plate 265 which are connected in sequence. The first fixing plate 261 is fixed to the inner wall of the first channel 21, one end of the first fixing plate 261 is connected to one end of the first elastic plate 262, the other end of the first elastic plate 262 is connected to one end of the second elastic plate 263, the other end of the second elastic plate 263 is connected to one end of the third elastic plate 264, the other end of the third elastic plate 264 is connected to one end of the connecting plate 265, and the other end of the connecting plate 265 It passes through the partition plate 25 and is connected to the first plug-in portion 23; the shielding portion 22 is arranged on the side wall of the third elastic plate 264, and the shielding portion 22 is arranged in the direction of the first fixed plate 261; wherein, along the distribution direction of the first elastic plate 262 and the second elastic plate 263, the second elastic plate 263 is curved; an avoidance groove 251 is provided on the partition plate 25, and the avoidance groove 251 is spaced apart from the connecting port 20, and one end of the connecting plate 265 away from the third elastic plate 264 passes through the avoidance groove 251 and is connected to the first plug-in portion 23; and at least a part of the connecting plate 265 is movably arranged in the avoidance groove 251.

[0051] Specifically, the avoidance groove 251 is communicated with the first placement cavity 2401 and the first channel 21 respectively.

[0052] Specifically, a side of the partition plate 25 close to the third shell 243 is provided with an avoidance groove 251, and the avoidance groove and the inner wall of the third shell 243 form an avoidance through hole. The avoidance through hole is respectively connected to the avoidance cavity 2430 and the first channel 21 (i.e., the first tube cavity 211). One end of the connecting plate 265 away from the third elastic plate 264 passes through the avoidance through hole and is located in the avoidance cavity 2430 of the third shell 243. The avoidance cavity 2430 is used to avoid the first plug-in portion 23 and the connecting plate 265, so as to facilitate the movement of the first plug-in portion 23 and the connecting plate 265.

[0053] Specifically, the first elastic plate 262 , the second elastic plate 263 , and the third elastic plate 264 form the elastic portion 260 , and the elastic portion 260 is connected to the first plug-in portion 23 via the connecting plate 265 .

[0054] Specifically, the connecting structure 26 also includes a second fixing plate 266 , two ends of which are respectively connected to one end of the first elastic plate 262 and one end of the first elastic plate 262 , and one end of the first fixing plate 261 is connected to one end of the first elastic plate 262 through the second fixing plate 266 .

[0055] Specifically, the protective component 2 also includes: a support plate 27 located on the inner wall of the first tube cavity 211, the support plate 27 and the inner wall form an insertion groove, the first fixing plate 261 is inserted in the insertion groove, and the first fixing plate 261 is fixed on the inner wall of the first tube cavity 211 (ie, the first channel 21).

[0056] Specifically, the first fixing plate 261 and the second fixing plate 266 are vertically arranged, and a slot is formed between the first fixing plate 261, the second fixing plate 266 and the first elastic plate 262, and the slot is clamped on the support plate 27; a first groove is formed between the first elastic plate 262, the second elastic plate 263 and the third elastic plate 264, and the slot and the first groove are in opposite directions.

[0057] Specifically, the protection assembly 2 further includes: a limiting member 28 disposed on the inner wall of the first channel 21, and the limiting member 28 is located on a side of the third elastic plate 264 away from the first elastic plate 262. With such a structural arrangement, the limiting member 28 is used to limit the deformation of the third elastic plate 264, so that the shielding portion 22 can completely block the connecting port 20 through the limiting member 28.

[0058] In this embodiment, if Figures 1 to 4 and Fig.11 As shown, the catheter assembly 1 includes: a catheter 11, a catheter seat 12, a clamping hose 13, a connector 14 and a needle-free infusion connector 15 which are connected in sequence along the extension direction from the liquid outlet 104 of the catheter assembly 1 to the liquid inlet 103 of the catheter assembly 1, the catheter 11 is away from the end of the catheter seat 12 to form the liquid outlet 104 of the catheter assembly 1, and the needle-free infusion connector 15 is away from the end of the connector 14 to form the liquid inlet 103 of the catheter assembly 1; wherein, the liquid channel 10 includes a first liquid circulation channel 101 and a second liquid circulation channel 102, and the first liquid circulation channel 101 is located in the needle-free infusion connector 15; the needle-free infusion connector 15 also has a gas circulation channel 150 which is spaced apart from the first liquid circulation channel 101, and at least part of the first liquid circulation channel 101 and the gas circulation channel 150 are both connected to the second liquid circulation channel 102.

[0059] Specifically, the catheter 11 has a first circulation channel 110, the catheter seat 12 has a second circulation channel 120, the clamping hose 13 has a third circulation channel 130, and the connector 14 has a fourth circulation channel 140. The first circulation channel 110, the second circulation channel 120, the third circulation channel 130 and the fourth circulation channel 140 are interconnected, and the first circulation channel 110, the second circulation channel 120, the third circulation channel 130 and the fourth circulation channel 140 form a second liquid circulation channel 102.

[0060] In the first embodiment of the needle-free infusion connector in the dialysis indwelling needle provided by the present invention, Fig.10 As shown, the needle-free infusion connector 15 includes: a first connector body 151, a first silicone valve 152 and a first exhaust membrane 153. The first connector body 151 has a second installation cavity 1500. The first connector body 151 is provided with a first communication port 1510 at one end close to the connector 14, which is connected to the second liquid circulation channel 102 and the second installation cavity 1500 respectively. A first vent 1511 is provided on the outer wall of the end of the first connector body 151 away from the connector 14. The first silicone valve 152 is at least partially disposed in the second installation cavity 1500. The first silicone valve 152 is provided with a first infusion passage 1511 which is in a closed state under normal conditions. Channel 1520, the outer wall of the first silicone valve 152 and the inner wall of the second installation cavity 1500 form a first exhaust channel 1521; the first exhaust channel 1521 is connected to the first vent 1511; the first exhaust membrane 153 is arranged in the second installation cavity 1500, the first exhaust membrane 153 has a first air permeable area 1530 and a flow port 1531 for liquid circulation, at least part of the first air permeable area 1530 is connected to the first exhaust channel 1521, the flow port 1531 is respectively connected to the first connecting port 1510 and the first infusion channel 1520, and the first exhaust membrane 153 is used to block liquid from entering the first exhaust channel 1521. With such a structural arrangement, after the needle is withdrawn, the air in the liquid channel 10 will sequentially pass through the first connecting port 1510, the first air permeable area 1530 and the first exhaust channel 1521 to reach the first vent 1511, and be discharged through the first vent 1511, thereby automatically completing the exhaust operation, thereby reducing the workload of medical staff and reducing the operational difficulty of connecting the pipeline during infusion therapy, improving the efficiency of connecting the pipeline during infusion therapy, and improving the work efficiency of medical staff. At the same time, the first exhaust membrane 153 can block the liquid from flowing into the first exhaust channel 1521, and can accurately control the flow of liquid, thereby ensuring the stability and accuracy of liquid delivery. In addition, when the needle-free infusion connector 15 is connected to the infusion device, the first vent 1511 can be blocked by the shell of the infusion device, thereby preventing liquid leakage and air from entering during the infusion process.

[0061] Specifically, when the catheter assembly 1 is connected to the protective assembly 2, one end of the needle-free infusion connector 15 having the first vent 1511 is inserted into the first placement cavity 2401 to block the first vent 1511 through the inner wall of the first placement cavity 2401 to prevent air from entering.

[0062] Specifically, the needle-free infusion connector also includes: an exhaust structure 154, which is arranged in the second installation cavity 1500; one end of the exhaust structure 154 is connected to one end of the first silicone valve 152 close to the first connecting port 1510, and the other end of the exhaust structure 154 is connected to the inner wall of the second installation cavity 1500, and an installation groove 1540 is provided on the end of the other end of the exhaust structure 154, and the first exhaust membrane 153 is arranged in the installation groove 1540, and the exhaust structure 154 has a second exhaust channel 1541 and a second infusion channel 1542 arranged at intervals, at least a portion of the first breathable area 1530 is connected to the second exhaust channel 1541, and the first exhaust channel 1521 is connected to at least a portion of the first breathable area 1530 through the second exhaust channel 1541; the second infusion channel 1542 is respectively connected to the circulation port 1531 and the first infusion channel 1520.

[0063] Specifically, one end of the first silicone valve 152 away from the exhaust structure 154 is protruded from one end of the needleless infusion connector 15 away from the connector 14, and one end of the first silicone valve 152 away from the exhaust structure 154 is overlapped on the end of the needleless infusion connector 15 away from the connector. One end of the first silicone valve 152 away from the exhaust structure 154 is the inlet of the first infusion channel 1520. The inlet of the first infusion channel 1520 is in a closed state under normal conditions, and the inlet of the first infusion channel 1520 and the outlet of the first infusion channel 1520 are both in a "one" shape or a "cross shape" under normal conditions. With such a structural arrangement, when the infusion device is inserted into the first infusion channel 1520, the first infusion channel 1520 can be squeezed more evenly, thereby increasing the service life of the first silicone valve 152 and allowing the liquid to pass through the first infusion channel smoothly.

[0064] Specifically, the exhaust structure 154 includes: a first flow shell 1543 and a second flow shell 1544, the first flow shell 1543 is an annular shell, and the first flow shell 1543 surrounds a fifth circulation channel 15420; the second flow shell 1544 is arranged at the end of the first flow shell 1543 away from the first silicone valve 152, the second flow shell 1544 is an annular shell, and the second flow shell 1544 surrounds a sixth circulation channel 15430; the sixth circulation channel 15430 is connected to the fifth circulation channel 15420, and the sixth circulation channel 15430 and the fifth circulation channel 15420 are connected to form a second infusion channel 1542.

[0065] In the second embodiment of the needle-free infusion connector in the dialysis indwelling needle provided by the present invention, Fig.12 As shown, the needle-free infusion connector 15 includes: a second connector body 160, a second silicone valve 161 and a second exhaust membrane 162, the second connector body 160 is provided with a fourth installation cavity 1600 and a fluid channel 1601 which are interconnected, and the fourth installation cavity 1600 and the fluid channel 1601 are sequentially arranged along the direction from the liquid inlet end 103 of the catheter assembly 1 to the liquid outlet end 104 of the catheter assembly 1; a second connecting port 1602 which is respectively connected to the second liquid circulation channel 102 and the fourth installation cavity 1600 is provided on the end surface of the second connector body 160 away from the fluid channel 1601; a second vent 1603 which is connected to the fluid channel 1601 is provided on the outer wall of the end of the second connector body 160 close to the fluid channel 1601; the second silicone valve 161 is installed on the fourth installation cavity 1600, and the ... second connector body 160 close to the fluid channel 1601; the second silicone valve 161 is installed on the fourth installation cavity 1600, and the second vent 1603 which is connected to the fluid channel 1601 is provided on the outer wall of the second connector body 160 close to the fluid channel 1601; the second silicone valve 161 is installed on the fourth installation cavity 1600, and the second vent 1603 which is connected to the fluid channel 1601 is provided on the outer wall of the second connector body 160 In the cavity 1600, the second silicone valve 161 is provided with a third infusion channel 1610 which is in a closed state under normal conditions; the outer wall of the second silicone valve 161 and the inner wall of the fourth installation cavity 1600 form a third exhaust channel 1605 which is respectively connected to the second connecting port 1602 and the fluid channel 1601; the second exhaust membrane 162 is arranged in the fourth installation cavity 1600, and the second exhaust membrane 162 is sleeved on the second silicone valve 161; the outer wall of the second exhaust membrane 162 abuts against the inner wall of the fourth installation cavity 1600, and the second exhaust membrane 162 and the second silicone valve 161 have an interference fit; the second exhaust membrane 162 has a second air permeable area 1620 which is connected to the third exhaust channel 1605, and the second air permeable area 1620 is used to prevent liquid from entering the third exhaust channel 1605.

[0066] Furthermore, when the infusion device passes through the fluid channel 1601 and is inserted into the third infusion channel 1610, the infusion device will open the liquid inlet of the third infusion channel 1610 close to the second connecting port 1602, thereby switching the third infusion channel 1610, which is in a closed state under normal circumstances, to a conducting state, thereby connecting the second connecting port 1602 with the third infusion channel 1610.

[0067] Furthermore, the second exhaust membrane 162 is a tubular ePTFE expanded body, and an insertion groove is provided in the middle of the second exhaust membrane 162. The second exhaust membrane 162 is sleeved on the second silicone valve 161 through the insertion groove. A second breathable area 1620 is provided between the insertion groove and the outer wall of the second exhaust membrane 162. The outer wall of the second exhaust membrane 162 abuts against the inner wall of the fourth installation cavity 1600 to achieve an interference fit with the second silicone valve 161 through radial pressure, thereby achieving sealing, so that liquid will not flow out from between the second exhaust membrane 162 and the second silicone valve 161.

[0068] In actual operation, during the exhaust process, the gas will enter the fourth installation cavity 1600 through the second connecting port 1602, and then pass through the second air permeable area 1620 of the second exhaust membrane 162 and the third exhaust channel 1605 to enter the fluid channel 1601, and finally be discharged from the second vent 1603.

[0069] In the first embodiment of the needle tube assembly 3 provided in the embodiment of the present invention, as Figure 5 As shown, the needle tube assembly 3 further includes: a needle seat 32 and an exhaust member 33. The needle seat 32 has a third installation cavity 321 and a blood return cavity 322 that are connected. At least part of the needle tube 31 is inserted into the third installation cavity 321, so that the needle tube 31 is connected to the needle seat 32 through the third installation cavity 321; one end of the exhaust member 33 is inserted into the blood return cavity 322 away from the end of the needle seat 32 away from the needle tube 31, so as to seal the blood in the needle seat 32. The exhaust member 33 is used to exhaust the dialysis indwelling needle before the needle is withdrawn.

[0070] In the second embodiment of the needle tube assembly 3 provided in the embodiment of the present invention, Fig.11 As shown, the needle tube assembly 3 also includes: a needle seat 32, the needle seat 32 has a third installation cavity 321, at least part of the needle tube 31 is inserted in the third installation cavity 321, so that the needle tube 31 is connected to the needle seat 32 through the third installation cavity 321; the needle glue 4 is poured into the third installation cavity 321, so that one end of the needle tube located in the third installation cavity 321 and the third installation cavity 321 are blocked by the needle glue 4 to prevent blood from entering the third installation cavity 321. At the same time, a side hole 313 is opened on the side wall of the needle tube 31, and blood flows into the second circulation channel 120 through the side hole 313; wherein the second circulation channel 120 forms a blood return cavity.

[0071] In this embodiment, the dialysis indwelling needle further includes a protective cover 5 , which is sleeved on the catheter assembly 1 to protect the needle tube 31 and the catheter 11 .

[0072] In this embodiment, the dialysis indwelling needle further includes a butterfly wing 6 , which is disposed on the outer wall of the catheter assembly 1 to fix the catheter assembly 1 .

[0073] The present invention provides an indwelling needle for dialysis, which comprises: a catheter assembly 1, a needle tube assembly 3 and a protection assembly 2, wherein the catheter assembly 1 has a liquid channel 10; the needle tube assembly 3 has a needle tube 31, and the needle tube 31 is movably arranged in the liquid channel 10; the protection assembly 2 is detachably connected to the catheter assembly 1, and the protection assembly 2 has a connecting port 20 and a first channel 21 connected to the connecting port 20; at least part of the needle tube 31 is located in the first channel 21; wherein the protection assembly 2 has a shielding portion 22 and a first plug-in portion 23, when the needle tube 31 is arranged in the liquid channel 10, the shielding portion 22 avoids the connecting port 20, and the first plug-in portion 23 is connected to the outer wall of the catheter assembly 1; when the puncture end 310 of the needle tube 31 is restricted in the first channel 21, the shielding portion 22 blocks the connecting port 20, and the first plug-in portion 23 is separated from the outer wall of the catheter assembly 1.

[0074] It can be seen that the dialysis indwelling needle provided by the present invention is provided with a catheter assembly 1, a needle assembly 3 and a protective assembly 2, and the needle tube 31 in the needle assembly 3 is at least partially located in the first channel 21 in the protective assembly 2, and then the needle tube 31 sequentially passes through the first channel 21 and the connecting port 20 and is movably arranged in the liquid channel 10. At the same time, the protective assembly 2 has a shielding portion 22 and a first plug-in portion 23. When the needle tube 31 is arranged in the liquid channel 10, the shielding portion 22 avoids the connecting port 20. At the same time, the first plug-in portion 23 is connected to the outer wall of the catheter assembly 1, and then the protective assembly 2 is connected to the catheter assembly 1, and the connection tightness of the protective assembly 2 and the catheter assembly 1 is improved by the first plug-in portion, ensuring that when the needle tube punctures the blood vessel, the protective assembly 2 is firmly connected to the catheter assembly 1. In addition, when the puncture end 310 of the needle tube 31 is limited in the first channel 21, the shielding portion 22 blocks the connecting port 20, and at the same time, the first plug-in portion 23 is separated from the outer wall of the catheter assembly 1. It can be seen that during the needle withdrawal process, when the puncture end 310 of the needle tube 31 moves into the first channel 21, the first plug-in portion 23 is separated from the outer wall of the catheter assembly 1, so that the protective component 2 and the catheter assembly 1 can be disassembled, and when the shielding portion 22 blocks the connecting port 20, the puncture end 310 of the needle tube 31 can be limited to the first channel 21, and the protective component forms a physical barrier for the puncture end 310 of the needle tube 31, thereby effectively preventing the puncture end 310 of the needle tube 31 from contacting the external environment when withdrawing from the catheter assembly 1, reducing the risk of the puncture end 310 of the needle tube 31 stabbing medical staff and patients. And effectively limit the movement range of the puncture end 310 of the needle tube 31 and avoid the influence of external substances on the needle, thereby improving the safety of the dialysis operation and reducing the possible infection risk. The dialysis indwelling needle has a simple structure and is easy to operate, and can effectively solve the technical problem of the risk of the dialysis indwelling needle in the prior art that there is a risk of the needle stabbing medical staff and patients after puncture.

[0075] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0076] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0077] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0078] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0079] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A dialysis indwelling needle, characterized in that: The dialysis indwelling needle comprises: A catheter assembly (1), the catheter assembly (1) having a liquid channel (10); A needle tube assembly (3), the needle tube assembly (3) comprising a needle tube (31), the needle tube (31) being movably arranged in the liquid channel (10); A protection component (2), the protection component (2) being detachably connected to the catheter component (1), the protection component (2) comprising a connection port (20) and a first channel (21) communicating with the connection port (20); at least a portion of the needle tube (31) is located in the first channel (21); The protective component (2) comprises a shielding portion (22) and a first plug-in portion (23); when the needle tube (31) is inserted into the liquid channel (10), the shielding portion (22) avoids the connecting port (20), and the first plug-in portion (23) is connected to the outer wall of the catheter component (1); when the puncture end (310) of the needle tube (31) is restricted in the first channel (21), the shielding portion (22) blocks the connecting port (20), and the first plug-in portion (23) is separated from the outer wall of the catheter component (1).

2. The dialysis indwelling needle according to claim 1, characterized in that: A limiting portion (210) is provided in the first channel (21), the limiting portion (210) is located at an end of the first channel (21) away from the connecting port (20), and the limiting portion (210) is arranged toward the axial direction of the needle tube (31); A protrusion (311) is provided on the outer wall of the needle tube (31), the protrusion (311) is close to the puncture end (310) of the needle tube (31), and the protrusion (311) is used for abutting against the limiting portion (210); When the protruding portion (311) abuts against the limiting portion (210), the puncture end (310) of the needle tube (31) is restricted within the first channel (21).

3. The dialysis indwelling needle according to claim 2, characterized in that: The protection component (2) further comprises: A protective shell (24) and a partition plate (25), wherein the protective shell (24) has a first installation cavity (240); the partition plate (25) is arranged in the first installation cavity (240) so as to separate the first installation cavity (240) into a first placement cavity (2401) and the first channel (21) through the partition plate (25); the first placement cavity (2401) is located at one end of the first channel (21) close to the connecting port (20); the partition plate (25) is provided with a connecting port (20), and the first channel (21) is connected to the first placement cavity (2401) through the connecting port (20); the shielding portion (22) is located in the first channel (21); the first placement cavity (2401) is used for placing the liquid inlet end (103) of the catheter assembly (1); At least part of the first plug-in portion (23) is movably arranged in the first placement cavity (2401); when the liquid inlet end (103) of the catheter assembly (1) is located in the first placement cavity (2401) and the shielding portion (22) avoids the connecting port (20), the first plug-in portion (23) is connected to the outer wall of the catheter assembly (1).

4. The dialysis indwelling needle according to claim 3, characterized in that: The first channel (21) comprises a first tube cavity (211), a second tube cavity (212) and a third tube cavity (213) which are interconnected, the first tube cavity (211), the second tube cavity (212) and the third tube cavity (213) being arranged in sequence, one end of the first tube cavity (211) being connected to the connecting port (20); the shielding portion (22) is located in the first tube cavity (211); The diameter of the second lumen (212) is greater than the diameter of the third lumen (213); the end wall of the third lumen (213) close to one end of the second lumen (212) forms the limiting portion (210); when the protruding portion (311) abuts against the end wall of the third lumen (213) close to one end of the second lumen (212), the puncture end (310) of the needle tube (31) is limited within the first lumen (211) or the second lumen (212).

5. The dialysis indwelling needle according to claim 3, characterized in that: The protection component (2) further comprises: a connection structure (26), an elastic portion (260) of the connection structure (26) being movably disposed in the first channel (21), and the elastic portion (260) being respectively connected to the shielding portion (22) and the first plug-in portion (23); The elastic part (260) has a compressed state and a restored state. When the needle tube (31) is inserted into the liquid channel (10), the elastic part (260) is in a compressed state, the elastic part (260) drives the shielding part (22) to avoid the connecting port (20), and the elastic part (260) drives the first plug-in part (23) to connect with the outer wall of the catheter assembly (1); when the puncture end (310) of the needle tube (31) is restricted in the first channel (21), the elastic part (260) is in a restored state, the elastic part (260) drives the shielding part (22) to block the connecting port (20), and the elastic part (260) drives the first plug-in part (23) to separate from the outer wall of the catheter assembly (1).

6. The dialysis indwelling needle according to claim 5, characterized in that: The connection structure (26) comprises a first fixing plate (261), a first elastic plate (262), a second elastic plate (263), a third elastic plate (264) and a connecting plate (265) which are connected in sequence, the first fixing plate (261) being fixed on the inner wall of the first channel (21), one end of the first fixing plate (261) being connected to one end of the first elastic plate (262), the other end of the first elastic plate (262) being connected to one end of the second elastic plate (263), the other end of the second elastic plate (263) being connected to one end of the third elastic plate (264), the other end of the third elastic plate (264) being connected to one end of the connecting plate (265), and the other end of the connecting plate (265) passing through the partition plate (25) and being connected to the first plug-in portion (23); the shielding portion (22) being arranged on the side wall of the third elastic plate (264), and the shielding portion (22) being arranged in the direction of the first fixing plate (261); Among them, along the distribution direction of the first elastic plate (262) and the second elastic plate (263), the second elastic plate (263) is curved; the partition plate (25) is provided with an avoidance groove (251), the avoidance groove (251) is spaced apart from the connecting port (20), and one end of the connecting plate (265) away from the third elastic plate (264) passes through the avoidance groove (251) and is connected to the first plug-in portion (23); and at least a part of the connecting plate (265) is movably arranged in the avoidance groove (251).

7. The dialysis indwelling needle according to claim 1, characterized in that: The catheter assembly (1) comprises: a catheter (11), a catheter seat (12), a clamping hose (13), a connector (14) and a needle-free infusion connector (15) which are sequentially connected along an extending direction from a liquid outlet (104) of the catheter assembly (1) to a liquid inlet (103) of the catheter assembly (1), wherein one end of the catheter (11) away from the catheter seat (12) forms the liquid outlet (104) of the catheter assembly (1), and one end of the needle-free infusion connector (15) away from the connector (14) forms the liquid inlet (103) of the catheter assembly (1); The liquid channel (10) comprises a first liquid circulation channel (101) and a second liquid circulation channel (102), wherein the first liquid circulation channel (101) is located in the needle-free infusion connector (15); the needle-free infusion connector (15) also comprises a gas circulation channel (150) spaced apart from the first liquid circulation channel (101), and at least a portion of the first liquid circulation channel (101) and the gas circulation channel (150) are connected to the second liquid circulation channel (102).

8. The dialysis indwelling needle according to claim 7, characterized in that: The needle-free infusion connector (15) comprises: A first connector body (151), wherein the first connector body (151) has a second installation cavity (1500) therein, and a first communication port (1510) is provided at one end of the first connector body (151) close to the connector (14) and is communicated with the second liquid circulation channel (102) and the second installation cavity (1500) respectively; and a first vent (1511) is provided on an outer wall of one end of the first connector body (151) away from the connector (14); a first silicone valve (152), at least a portion of the first silicone valve (152) being disposed in the second installation cavity (1500), a first infusion channel (1520) being in a closed state under normal conditions being disposed in the first silicone valve (152), a first exhaust channel (1521) being formed between an outer wall of the first silicone valve (152) and an inner wall of the second installation cavity (1500); the first exhaust channel (1521) being in communication with the first vent (1511); a first exhaust membrane (153), arranged in the second installation cavity (1500), the first exhaust membrane (153) having a first air permeable area (1530) and a flow port (1531) for liquid flow, at least a portion of the first air permeable area (1530) being in communication with the first exhaust channel (1521), the flow port (1531) being respectively connected to the first communication port (1510) and the first liquid infusion channel (1520), the first exhaust membrane (153) being used to prevent the liquid from entering the first exhaust channel (1521); An exhaust structure (154) is arranged in the second installation cavity (1500); one end of the exhaust structure (154) is connected to one end of the first silicone valve (152) close to the first connecting port (1510), and the other end of the exhaust structure (154) is connected to the inner wall of the second installation cavity (1500), and an installation groove (1540) is provided on the end of the other end of the exhaust structure (154), and the first exhaust membrane (153) is arranged in the installation groove (1540). The structure (154) comprises a second exhaust channel (1541) and a second infusion channel (1542) which are arranged at intervals; at least a portion of the first air permeable area (1530) is connected to the second exhaust channel (1541); the first exhaust channel (1521) is connected to at least a portion of the first air permeable area (1530) through the second exhaust channel (1541); and the second infusion channel (1542) is respectively connected to the circulation port (1531) and the first infusion channel (1520).

9. The dialysis indwelling needle according to claim 7, characterized in that: The needle-free infusion connector (15) comprises: A second connector body (160), wherein a fourth installation cavity (1600) and a fluid channel (1601) are provided in the second connector body (160), and the fourth installation cavity (1600) and the fluid channel (1601) are arranged in sequence along the direction from the liquid inlet end (103) of the catheter assembly (1) to the liquid outlet end (104) of the catheter assembly (1); a second communication port (1602) is provided on an end surface of an end of the second connector body (160) away from the fluid channel (1601), and is respectively communicated with the second liquid circulation channel (102) and the fourth installation cavity (1600); and a second vent port (1603) is provided on an outer wall of an end of the second connector body (160) close to the fluid channel (1601), and is communicated with the fluid channel (1601); a second silicone valve (161), the second silicone valve (161) being installed in the fourth installation cavity (1600), the second silicone valve (161) being provided with a third infusion channel (1610) which is in a closed state under normal conditions; a third exhaust channel (1605) which is respectively connected to the second communication port (1602) and the fluid channel (1601) is formed between the outer wall of the second silicone valve (161) and the inner wall of the fourth installation cavity (1600); The second exhaust membrane (162) is arranged in the fourth installation cavity (1600), and the second exhaust membrane (162) is sleeved on the second silicone valve (161); the outer wall of the second exhaust membrane (162) abuts against the inner wall of the fourth installation cavity (1600), and the second exhaust membrane (162) and the second silicone valve (161) are interference fit; the second exhaust membrane (162) has a second air permeable area (1620) connected to the third exhaust channel (1605), and the second air permeable area (1620) is used to block the liquid from entering the third exhaust channel (1605).

10. The dialysis indwelling needle according to claim 1, characterized in that: The needle tube assembly (3) further comprises: A needle seat (32), wherein the needle seat (32) has a third installation cavity (321) and a blood return cavity (322) that are connected to each other, and at least a portion of the needle tube (31) is inserted into the third installation cavity (321) so as to connect the needle tube (31) to the needle seat (32) through the third installation cavity (321); An exhaust member (33), one end of which is inserted into the blood return chamber (322) from the end of the needle seat (32) away from the needle tube (31) to seal the blood in the needle seat (32); and the exhaust member (33) is used to exhaust the dialysis indwelling needle before the needle is withdrawn.

Images