A multifunctional auxiliary device for in-situ dialysis catheter replacement

Abstract

A multifunctional auxiliary device for in-situ dialysis catheter replacement. A guide wire sequentially passes through a puncture tube. As the sharp end of the puncture tube pierces through a blocking membrane, it passes through a guiding catheter, passes through a dialysis catheter connected to a connecting tube along the guiding catheter, and penetrates into the human body along the dialysis catheter. Compared with the prior art, the present invention has the following advantages: during the replacement of a hemodialysis catheter, when the guide wire enters the blood vessel, the blood leakage along the gaps between the guide wire and the catheter lumen in the catheter is significantly reduced; it avoids serious complications such as air embolism caused by air entering the body along the guide wire; it reduces the contact with the original catheter during the operation, making the sterile area in the operation process cleaner and reducing the infection incidence rate. The operator can also complete the operation calmly, relatively improving the safety of the newly placed catheter and the effect of the new catheter. In addition, the injection connecting tube connected to a syringe can be used for angiography through a side hole to distinguish the reasons for the poor function of the original catheter, evaluate the local vascular conditions, and help to propose a better catheter treatment plan.

Description

Technical Field

[0001] The present invention relates to the field of medical device supplies, and particularly to a multifunctional auxiliary device for in-situ replacement of dialysis catheters. Background Art

[0002] Hemodialysis, abbreviated as HD, is also commonly known as artificial kidney or kidney dialysis in popular terms. It is a type of blood purification technology. It uses the principle of semipermeable membrane to remove various harmful and excessive metabolic wastes and excessive electrolytes from the body through diffusion and convection, so as to achieve the purpose of purifying blood and correcting the balance of water, electrolytes and acid-base.

[0003] In clinical practice, hemodialysis catheters and guidewires are usually used in combination to complete the insertion of hemodialysis catheters. Hemodialysis catheters are used to create short-term venous access for hemodialysis, blood sampling, blood pressure measurement and fluid infusion; guidewires play roles of introduction, support, opening and exchange in vascular intervention. However, in actual use, due to the poor function of temporary dialysis catheters or the need to change to long-term dialysis catheters, the hemodialysis catheters in the body need to be replaced in situ. During the replacement process, when the guidewire is introduced into the human blood vessel, blood often leaks out due to the gap between the guidewire and the original catheter lumen, or air enters the human body through the guidewire, causing serious complications such as air embolism. During the operation, it is necessary to contact the original catheter to insert the guidewire, resulting in contamination of the sterile area (the external catheter is sterile, and direct contact with the external catheter reduces contamination). If it is necessary to insert the guidewire under intervention, it is necessary to first inject contrast agent from the catheter port using a syringe, and then remove the syringe and replace it with the guidewire. The operation process is complex, increasing the operation time and the risk of contamination. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to solve the problem that during the in-situ replacement of dialysis catheters, when the guidewire enters the blood vessel, a large amount of blood bleeds from the blood vessel and air enters the blood vessel, aggravating the condition.

[0005] A multifunctional auxiliary device for in-situ dialysis catheter replacement, comprising a guide wire, a dialysis catheter, and a replacement part movably connected to the dialysis catheter. Among them, the guide wire sequentially passes through the replacement part and enters the human body through the nozzle of the dialysis catheter; the replacement part includes a first replacement tube, a second replacement tube, a puncture tube, a guiding catheter, a blocking piece, and a blocking membrane. The first replacement tube includes a connecting tube and a dialysis connecting tube. The nozzle of the dialysis connecting tube is movably connected to the nozzle of the dialysis catheter, and the nozzle of the connecting tube is movably connected to one end nozzle of the second replacement tube. The puncture tube penetrates into the second replacement tube from the other end nozzle of the second replacement tube. The puncture tube is overall conical, and the sharp end of the puncture tube contacts the blocking membrane. The gentle end of the puncture tube is partially exposed outside the second replacement tube; the connecting tube is movably connected to the blocking piece at the edge of the nozzle connected to the second replacement tube. The blocking piece covers the nozzle of the connecting tube. The blocking membrane is arranged on the blocking piece and covers the opening formed at the center of the blocking piece; the guiding catheter is placed inside the connecting tube, and the nozzle at one end of the guiding catheter passes through the opening of the dialysis connecting tube and is placed in the dialysis connecting tube, and the nozzle at the other end contacts the blocking piece and surrounds the periphery of the blocking membrane. A plurality of catheter holes are formed along the length direction of the tube wall of the guiding catheter; the guide wire sequentially passes through the puncture tube, passes through the guiding catheter as the sharp end of the puncture tube pierces the blocking membrane, passes through the dialysis catheter connected to the connecting tube along the guiding catheter, and penetrates into the human body along the dialysis catheter.

[0006] In the technical solution of the present invention, during the replacement process, the guide wire sequentially passes through the puncture tube, passes through the guiding catheter as the sharp end of the puncture tube pierces the blocking membrane, passes through the dialysis catheter connected to the connecting tube along the guiding catheter, and penetrates into the human body along the dialysis catheter, avoiding the problem that the guide wire cannot be inserted into the human body at one time or requires a long time due to the manipulation method and the characteristics of the guide wire itself, resulting in a large amount of bleeding at the puncture site or air entering the body along with the guide wire.

[0007] Preferably, an injection connecting tube for connecting a syringe is arranged on the tube wall of the dialysis connecting tube, and a water stop valve for blocking the injection liquid of the syringe is arranged on the injection connecting tube.

[0008] In the technical solution of the present invention, arranging the injection connecting tube facilitates connecting the syringe. The syringe is connected to the dialysis catheter to avoid secondary puncture, and then liquid can be injected into the body. The arranged water stop valve facilitates opening the valve during use for the syringe to inject liquid, and closing the valve when not in use to prevent the liquid in the syringe from entering the human body.

[0009] Preferably, the connecting tube is provided with a blocking block for blocking the nozzle of the guiding catheter placed inside the connecting tube. An opening for the blocking block to enter and exit is formed on the tube wall of the connecting tube. Symmetrical protrusions are arranged on the two side surfaces of the blocking block in contact with the tube wall, and the diameter of the blocking block is larger than the diameter of the nozzle of the guiding catheter.

[0010] In the technical solution of the present invention, the blocking block blocks the nozzle of the guiding catheter to avoid the reverse flow situation during syringe injection, and the protrusions arranged on the blocking block can limit the position of the blocking block.

[0011] Preferably, a multifunctional auxiliary device for in-situ dialysis catheter replacement further includes a support portion for strengthening the connection between the reinforcement syringe and the replacement portion. The support portion includes a first pipe clamp, a second pipe clamp, and a support rod. Among them, the first pipe clamp is clamped on the injection pipe of the syringe and locked and fixed by a fastener. The second pipe clamp is clamped on the first replacement pipe and locked and fixed by a fastener. The two pipe clamps are respectively hinged to one end of the support rod and fixed by nuts to strengthen the connection between the reinforcement syringe and the replacement portion.

[0012] In the technical solution of the present invention, the support portion can strengthen the connection between the syringe and the replacement portion. The two pipe clamps are respectively clamped on the syringe body and the first replacement pipe body and fixed by fasteners, which is convenient for disassembly and assembly. Moreover, the two pipe clamps are hinged to the support rod and can also be adjusted according to needs.

[0013] Preferably, the nozzle diameter of the guiding catheter is larger than the diameter of the covering partition film. In the technical solution of the present invention, the nozzle diameter of the guiding catheter is larger than the diameter of the covering partition film, so that the guide wire will extend along the guiding of the guiding catheter when it extends out of the partition film.

[0014] Preferably, the connection between the first replacement pipe and the second replacement pipe is provided with an external thread, and the second replacement pipe is provided with a corresponding internal thread. The first replacement pipe and the second replacement pipe are connected by threads. In the technical solution of the present invention, the threaded connection is convenient for combination and the operation is simple.

[0015] Preferably, the connection between the puncture pipe and the second replacement pipe is provided with an external thread, and the second replacement pipe is provided with a corresponding internal thread. The puncture pipe and the second replacement pipe are connected by threads. The puncture pipe rotates along the thread towards the partition film direction, and the sharp end of the puncture pipe rotates through the partition film. In the technical solution of the present invention, the threaded connection between the puncture pipe and the second replacement pipe is convenient for combination, and the puncture pipe can also rotate along the thread direction to penetrate the partition film.

[0016] Preferably, the partition piece is provided with a block corresponding to and engaging with the card slot at the edge of the nozzle of the first replacement pipe. The partition piece and the first replacement pipe are fixedly engaged by the block being engaged into the card slot. In the technical solution of the present invention, the partition piece and the first replacement pipe are engaged and connected, which is simple and easy to operate.

[0017] Preferably, both the first replacement pipe and the second replacement pipe are made of transparent PVC material, and the puncture pipe is also made of transparent PVC material. In the technical solution of the present invention, using transparent PVC material is convenient for observing the situation inside the pipe.

[0018] Preferably, the dialysis connection pipe is threadedly connected to the dialysis catheter, and the injection connection pipe is threadedly connected to the syringe. In the technical solution of the present invention, the threaded connection is not only convenient for connection but also simple in operation.

[0019] The beneficial effects of the present invention compared with the prior art are as follows: The guide wire sequentially passes through the puncture tube, pierces through the baffle film with the sharp end of the puncture tube and then passes through the guiding catheter, and then passes through the dialysis catheter connected to the connecting tube along the guiding catheter, and penetrates into the human body along the dialysis catheter. During the replacement process of the hemodialysis catheter, the guide wire enters the blood vessel, significantly reducing the leakage of blood in the catheter along the gaps between the guide wire and the catheter lumen; avoiding serious complications such as air embolism caused by air entering the body along the guide wire; reducing the contact with the original catheter during the operation, making the sterile area during the operation cleaner, reducing the incidence of infection, and allowing the operator to complete the operation calmly, relatively improving the safety of the newly placed catheter and the effect of the new catheter. In addition, the injection connecting tube connected to the syringe can be used for contrast imaging through the side hole to distinguish the reasons for the poor function of the original catheter, evaluate the local blood vessel conditions, and help propose a better catheter treatment plan. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a schematic diagram of the overall structure of the present invention (hiding the syringe and the support part).

[0021] Figure 2 FIG. is a schematic diagram of the tube body structure of the replacement part of the present invention.

[0022] Figure 3 FIG. is a schematic diagram of the tube body structure of the replacement part of the present invention (hiding the second replacement tube).

[0023] Figure 4 FIG. is a schematic cross-sectional view of the tube body of the replacement part of the present invention.

[0024] Figure 5 FIG. is a front view of the tube body of the replacement part of the present invention.

[0025] Figure 6 FIG. is a schematic diagram of the overall structure of the present invention.

[0026] Figure 7 FIG. is a schematic cross-sectional view of the overall structure of the present invention.

[0027] Figure 8 FIG. is a schematic diagram of the structure of the support part of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] The following will combine the attached drawings in the embodiments of the present invention Figure 1-8 to describe the technical solutions in the embodiments of the present invention in detail.

[0029] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention. In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The guide wire, syringe, dialysis catheter, etc. mentioned in the technical solution of the present invention are all prior arts, and their operation and usage methods are well known to those of ordinary skill in the art and the general public.

[0031] Embodiment 1

[0032] As Figure 1-3 shown, a multifunctional auxiliary device for in-situ dialysis catheter replacement includes a guide wire 2, a dialysis catheter 5, and a replacement part 1 threadedly connected to the dialysis catheter 5. Among them, the guide wire 2 sequentially passes through the replacement part 1 and enters the human body through the orifice of the dialysis catheter 5; the replacement part 1 includes a first replacement tube 1a, a second replacement tube 1b, a puncture tube 1c, a guiding catheter 1d, a blocking piece 1e, and a blocking membrane 1f. Both the first replacement tube 1a and the second replacement tube 1b are made of transparent PVC material, and the puncture tube 1c is also made of transparent PVC material; the first replacement tube 1a includes a connecting tube 1j and a dialysis threaded connecting tube 1j. The orifice of the dialysis connecting tube 1k is threadedly connected to the orifice of the dialysis catheter 5. An injection connecting tube 1g for connecting a syringe 4 is provided on the wall of the dialysis connecting tube 1k, and a water stop valve 1h for blocking the injection of liquid by the syringe 4 is provided on the injection connecting tube 1g.

[0033] As Figure 1-7As shown in the figure, an external thread is provided at the connection between the first replacement tube 1a and the second replacement tube 1b, and a corresponding internal thread is provided on the second replacement tube 1b. The first replacement tube 1a and the second replacement tube 1b are connected by threads; the puncture tube 1c penetrates into the second replacement tube 1b from the other end of the second replacement tube 1b. A tube opening through which the guide wire 2 passes is provided on the puncture tube 1c. The puncture tube 1c is generally conical in shape. The sharp end of the puncture tube 1c contacts the blocking membrane 1f, and the gentle end of the puncture tube 1c is partially exposed outside the second replacement tube 1b. An external thread is provided at the connection between the puncture tube 1c and the second replacement tube 1b, and a corresponding internal thread is provided on the second replacement tube 1b. The puncture tube 1c and the second replacement tube 1b are connected by threads. The puncture tube 1c rotates in the direction of the blocking membrane 1f along the threads, and then the sharp end of the puncture tube 1c rotates through the blocking membrane 1f. The connecting tube 1j is movably connected to the blocking piece 1e at the edge of the tube opening connected to the second replacement tube 1b. The blocking piece 1e is provided with a clamping block corresponding to and engaging with the clamping groove at the edge of the tube opening of the first replacement tube 1a. The blocking piece 1e and the first replacement tube 1a are clamped and fixed by the clamping block engaging into the clamping groove. The blocking piece 1e covers the tube opening of the connecting tube 1j. The blocking membrane 1f is adhered or pressed on the blocking piece 1e and covers the opening provided at the center of the blocking piece 1e. The guiding catheter 1d is placed in the connecting tube 1j, and one end of the guiding catheter 1d passes through the opening of the dialysis connecting tube 1k and is placed in the dialysis connecting tube 1k, and the other end of the tube opening contacts the blocking piece 1e. The diameter of the tube opening of the guiding catheter 1d is larger than the diameter of the covered blocking membrane 1f. The tube opening of the guiding catheter 1d surrounds the periphery of the blocking membrane 1f. When the guide wire 2 passes through the blocking membrane 1f, it will follow the guiding of the guiding catheter 1d and pass through the dialysis connecting tube 1k, and then penetrate into the human body through the dialysis catheter 5.

[0034] As Figure 1-7 shown, a plurality of catheter holes are provided along the length direction of the wall of the guiding catheter 1d. For example, two catheter holes are provided. The connecting tube 1j is provided with a blocking block 1i that blocks the tube opening of the guiding catheter 1d placed in the connecting tube 1j. An opening for the blocking block 1i to enter and exit is provided on the wall of the connecting tube 1j. Symmetrical protrusions are provided on the two side surfaces of the blocking block 1i in contact with the tube wall. The diameter of the blocking block 1i is larger than the diameter of the tube opening of the guiding catheter 1d. The guide wire 2 sequentially passes through the puncture tube 1c, passes through the guiding catheter 1d as the sharp end of the puncture tube 1c pierces through the blocking membrane 1f, passes through the dialysis catheter 5 connected to the connecting tube 1j along the guiding catheter 1d, and penetrates into the human body along the dialysis catheter 5.

[0035] As Figure 4-8As shown in the figure, the in-situ dialysis catheter replacement device 5 further includes a support part 3 that strengthens the connection between the reinforcing syringe 4 and the replacement part 1. The support part 3 includes a first pipe clamp 3a, a second pipe clamp 3b, and a support rod 3c. Among them, the first pipe clamp 3a is clamped on the injection pipe of the syringe 4 and locked and fixed by a fastener. The second pipe clamp 3b is clamped on the first replacement pipe 1a and locked and fixed by a fastener. The two pipe clamps are respectively hinged to one end of the support rod 3c and fixed by nuts to strengthen the connection between the syringe 4 and the replacement part 1.

[0036] The operation principle and process of the present invention: When a patient needs to replace the dialysis catheter 5 regularly during hemodialysis to avoid infection, when replacing the dialysis catheter 5, first inject a sealing liquid into the first replacement pipe 1a, then snap the baffle piece 1e into the card slot of the first replacement pipe 1a to seal the first replacement pipe 1a. Then connect the first replacement pipe 1a to the second replacement pipe 1b. Then pull out the plug of the dialysis connection pipe 1k of the first replacement pipe 1a and connect it to the dialysis catheter 5. Then rotate and push the puncture tube 1c along the thread from the bottom pipe orifice of the second replacement pipe 1b. The sharp end of the puncture tube 1c pierces the baffle membrane 1f. The guide wire 2 sequentially passes through the puncture tube 1c, passes through the guiding catheter 1d placed in the second replacement pipe 1b, passes through the first replacement pipe 1a, then passes through the dialysis catheter 5, and penetrates into the human body along the dialysis catheter 5 for in-situ replacement. The guide wire 2 sequentially passes through the puncture tube 1c, passes through the guiding catheter 1d along with the sharp end of the puncture tube 1c piercing the baffle membrane 1f, passes through the dialysis catheter 5 connected to the connecting pipe 1j along the guiding catheter 1d, and penetrates into the human body along the dialysis catheter 5. During the replacement process of the dialysis catheter 5, the guide wire 2 enters the blood vessel, significantly reducing the leakage of blood in the catheter along the gap between the guide wire 2 and the catheter lumen; avoiding serious complications such as air embolism caused by air entering the body along the guide wire; reducing the contact with the original catheter during the operation, making the sterile area during the operation cleaner, reducing the incidence of infection, and the operator can also complete the operation calmly, relatively improving the safety of the newly placed catheter and the effect of the new catheter.

[0037] According to needs, a syringe 4 filled with a contrast agent or other liquid can also be connected to the injection connection pipe 1g of the first replacement pipe 1a to inject the corresponding liquid into the human body to distinguish the reasons for the malfunction of the original catheter and evaluate the local vascular conditions, which helps to propose a better catheter treatment plan. When injecting the liquid with the syringe 4, to avoid the liquid flowing back into the first replacement pipe 1a, the blocking block 1i can be used to block the pipe orifice of the guiding catheter 1d located in the first replacement pipe 1a.

[0038] The above embodiments are only used to illustrate the technical idea of the present invention and cannot limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention fall within the protection scope of the present invention.

Claims

1. A multifunctional auxiliary device for in-situ dialysis catheter replacement, comprising a guide wire (2) and a dialysis catheter (5). Characterized in that: It further comprises a replacement part (1) movably connected to the dialysis catheter (5), wherein the guide wire (2) sequentially passes through the replacement part (1) and the orifice of the dialysis catheter (5) and enters the human body. The replacement part (1) comprises a first replacement tube (1a), a second replacement tube (1b), a puncture tube (1c), a guiding catheter (1d), a blocking piece (1e) and a blocking membrane (1f). The first replacement tube (1a) comprises a connecting tube (1j) and a dialysis connecting tube (1k). The orifice of the dialysis connecting tube (1k) is movably connected to the orifice of the dialysis catheter (5). The orifice of the connecting tube (1j) is movably connected to one end orifice of the second replacement tube (1b). The puncture tube (1c) penetrates into the second replacement tube (1b) from the other end orifice of the second replacement tube (1b). The puncture tube (1c) is generally conical in shape. The sharp end of the puncture tube (1c) contacts the blocking membrane (1f), and the gentle end part of the puncture tube (1c) is exposed outside the second replacement tube (1b). The connecting tube (1j) is movably connected to the blocking piece (1e) at the edge of the orifice connected to the second replacement tube (1b). The blocking piece (1e) covers the orifice of the connecting tube (1j). The blocking membrane (1f) is arranged on the blocking piece (1e) and covers the opening formed at the center of the blocking piece (1e). The guiding catheter (1d) is placed inside the connecting tube (1j). One end orifice of the guiding catheter (1d) passes through the opening of the dialysis connecting tube (1k) and is placed inside the dialysis connecting tube (1k). The other end orifice contacts the blocking piece (1e) and surrounds the periphery of the blocking membrane (1f). A plurality of catheter holes are formed in the guiding catheter (1d) along the length direction of the tube wall. The guide wire (2) sequentially passes through the puncture tube (1c), penetrates through the guiding catheter (1d) as the sharp end of the puncture tube (1c) pierces through the blocking membrane (1f), passes through the dialysis catheter (5) connected to the connecting tube (1j) along the guiding catheter (1d), and penetrates into the human body along the dialysis catheter (5). An injection connecting tube (1g) for connecting a syringe (4) is arranged on the tube wall of the dialysis connecting tube (1k). A water stop valve (1h) for blocking the injection of liquid by the syringe (4) is arranged on the injection connecting tube (1g). The connecting tube (1j) is provided with a blocking block (1i) for blocking the orifice of the guiding catheter (1d) placed inside the connecting tube (1j). An opening for the entry and exit of the blocking block (1i) is formed on the tube wall of the connecting tube (1j). Symmetric protrusions are arranged on the two side surfaces of the blocking block (1i) in contact with the tube wall. The diameter of the blocking block (1i) is larger than the diameter of the orifice of the guiding catheter (1d).

2. The multifunctional auxiliary device for in-situ dialysis catheter replacement according to claim 1, Characterized in that: A multifunctional auxiliary device for in-situ dialysis catheter replacement also includes a support part (3) for reinforcing the connection between a syringe (4) and a replacement part (1), the support part (3) comprising a first tube clamp (3a), a second tube clamp (3b) and a support rod (3c), wherein the first tube clamp (3a) is clamped on the injection tube of the syringe (4) and is locked and fixed by a fastener, and the second tube clamp (3b) is clamped on the first replacement tube (1a) and is locked and fixed by a fastener, and the two tube clamps are respectively hinged to one end of the support rod (3c) and fixed by a nut to reinforce the connection between the syringe (4) and the replacement part (1).

3. A multifunctional auxiliary device for in situ dialysis catheter replacement according to claim 1, Features: The diameter of the tube opening of the guide catheter (1d) is larger than the diameter of the covering barrier film (1f).

4. A multifunctional auxiliary device for in situ dialysis catheter replacement according to claim 1, Features: An external thread is provided at the connection between the first displacement tube (1a) and the second displacement tube (1b), and the second displacement tube (1b) is provided with a corresponding internal thread. The first displacement tube (1a) and the second displacement tube (1b) are connected via threads.

5. A multifunctional auxiliary device for in situ dialysis catheter replacement according to claim 1, Features: An external thread is provided at the connection between the puncture tube (1c) and the second replacement tube (1b), and the second replacement tube (1b) is provided with a corresponding internal thread. The puncture tube (1c) and the second replacement tube (1b) are connected via the thread. The puncture tube (1c) rotates along the thread in the direction of the blocking membrane (1f), and the sharp end of the puncture tube (1c) rotates to penetrate the blocking membrane (1f).

6. A multifunctional auxiliary device for in situ dialysis catheter replacement according to claim 1, Features: The blocking piece (1e) is provided with a clamping block that is correspondingly engaged with a clamping groove at the edge of the tube opening of the first replacement tube (1a); the blocking piece (1e) and the first replacement tube (1a) are clamped and fixed by the clamping block being engaged in the clamping groove.

7. A multifunctional auxiliary device for in situ dialysis catheter replacement according to claim 1, Features: The first replacement tube (1a) and the second replacement tube (1b) are both made of transparent PVC material, and the puncture tube (1c) is also made of transparent PVC material.

8. A multifunctional auxiliary device for in situ dialysis catheter replacement according to claim 1, Features: The dialysis connecting tube (1k) is threadedly connected to the dialysis catheter (5), and the injection connecting tube (1g) is threadedly connected to the syringe (4).

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