A double-lumen central venous catheter with anti-adhesion and anticoagulant functions

Abstract

This utility model belongs to the field of medical device technology, specifically relating to a double-lumen central venous catheter with anti-wall adhesion and anticoagulation functions, including an extension tube, a double-lumen catheter, and a connector; the extension tube is connected to the double-lumen catheter through the connector; the double-lumen catheter is divided into two inlet lumens by a diaphragm, and the two inlet lumens are connected to two corresponding extension tubes; a side hole and a main hole are provided at the end of the double-lumen catheter, and the end of the double-lumen catheter has a C-shaped segment, with the side hole located on the concave side of the C-shaped segment, and the main hole located at the end of the double-lumen catheter. The C-shaped segment in this design reduces the occurrence of the side hole adhering to the blood vessel wall, reducing the probability of local coagulation and thrombosis when used for pediatric hemodialysis blood drainage; the biomimetic sharkskin microgrooves etched on the outside of the double-lumen catheter reduce resistance to blood flow and thrombus formation; the biomimetic sharkskin microgrooves can be filled with covalently grafted sulfonated heparin-hydrogel, continuously releasing anticoagulant factors, further reducing the formation of wall-attached thrombi.

Description

Technical Field

[0001] This utility model belongs to the field of medical supplies technology, specifically relating to a double-lumen central venous catheter with anti-wall adhesion and anticoagulation functions. Background Technology

[0002] Central venous catheters are important medical devices commonly used in clinical practice for monitoring and treatment. When in use, one end of a central venous catheter is inserted into a blood vessel, while the other end is placed outside the body. This allows for simple and painless intravenous drug therapy, rapid blood transfusion and volume therapy for intraoperative hemorrhagic shock, total parenteral central venous nutrition, blood transfusion and blood supplies, blood sample collection, monitoring of central venous pressure, and so on. Dual-lumen central venous catheters are a type of central venous catheter that can provide two independent infusion pathways simultaneously.

[0003] Existing double-lumen central venous catheters generally use a straight tube structure. After insertion into a blood vessel, the double-lumen catheter is prone to apposition to the vessel wall, meaning the catheter wall is in close proximity to the vessel wall over a large area. This not only affects blood flow and causes blockage of the upper side port of the double-lumen catheter, but also easily leads to coagulation in the area where apposition occurs for a prolonged period, increasing the probability of thrombosis. While used in pediatric hemodialysis, because children's blood vessels are relatively thin, the conventional catheter side port is extremely prone to apposition to the vessel wall, resulting in poor blood flow. Consequently, hemodialysis cannot proceed smoothly, requiring frequent catheter or hemodialysis consumable replacements, consuming significant manpower and resources.

[0004] Therefore, it is necessary to design a double-lumen central venous catheter with anti-wall adhesion and anticoagulation functions. Utility Model Content

[0005] To address the aforementioned problems in existing technologies, this solution provides a dual-lumen central venous catheter with anti-wall adhesion and anticoagulation functions.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A dual-lumen central venous catheter with anti-wall adhesion and anticoagulation functions includes an extension tube, a dual-lumen catheter, and a connector. The extension tube is connected to the dual-lumen catheter through the connector. A diaphragm is provided inside the dual-lumen catheter, which divides the lumen of the dual-lumen catheter into two inlet lumens, and the two inlet lumens are connected to the two extension tubes respectively. A side hole and a main hole are provided at the end of the dual-lumen catheter, and the side hole and the main hole are connected to the two inlet lumens respectively.

[0008] The end of the double-lumen catheter has a C-shaped section, which bends into a C shape in its natural state. The side hole is located on the concave side of the C-shaped section, and the main hole is located at the end of the double-lumen catheter.

[0009] As an alternative or supplement to the above scheme, the outer surface of the double-lumen catheter is provided with an anticoagulant layer.

[0010] As an alternative or supplement to the above solution, a biomimetic shark skin microgroove is laser-etched on the outside of the double-lumen catheter, and the biomimetic shark skin microgroove is filled with the anticoagulant blood layer.

[0011] As an alternative or supplement to the above solution, the biomimetic shark skin microgroove creates strip-shaped protrusions on the outside of the double-lumen catheter.

[0012] As an alternative or supplement to the above scheme, the anticoagulated blood layer uses heparin.

[0013] As an alternative or supplement to the above scheme, the width of the biomimetic shark skin microgroove is 20μm±1μm and the depth is 10μm±1μm.

[0014] As an alternative or supplement to the above scheme, before the double-lumen central venous catheter is inserted into the blood vessel, a guidewire is inserted into the insertion lumen. The guidewire can keep the double-lumen catheter in a straight tube shape and can be withdrawn from the extension tube.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. In this design, the end of the double-lumen catheter is C-shaped, which reduces the likelihood of the side hole being too close to the blood vessel wall. When used for blood drainage in pediatric hemodialysis, this reduces the incidence of poor drainage and the probability of local coagulation and thrombosis.

[0017] 2. In addition, the biomimetic shark skin microgrooves laser-etched on the outer silicone surface of the double-lumen catheter can reduce resistance to blood flow, reduce blood component adhesion to the wall, and reduce the formation of catheter wall thrombi. The biomimetic shark skin microgrooves can be filled with covalently grafted sulfonated heparin-hydrogel, which continuously releases anticoagulant factors, further reducing the formation of wall thrombi. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this scheme or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0019] Figure 1 This is a diagram showing the usage status of the dual-lumen central venous catheter in this plan;

[0020] Figure 2 This is a structural diagram of the double-lumen central venous catheter in this scheme;

[0021] Figure 3 This is a cross-sectional view of the C-shaped section;

[0022] Figure 4 This is an enlarged structural diagram of the biomimetic shark skin microgrooves and strip-shaped protrusions.

[0023] In the diagram: 1-Double-lumen catheter; 2-Connector; 3-September; 4-Side hole; 5-Main hole; 6-Bionic sharkskin microgroove; 7-Strip protrusion; 8-Extension tube; 9-C-shaped segment; 10-Vein. Detailed Implementation

[0024] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only a part of the embodiments, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in this solution without creative effort are within the protection scope of this solution.

[0025] Example 1

[0026] like Figures 1 to 3 As shown, this embodiment designs a double-lumen central venous catheter with anti-wall adhesion and anticoagulation functions, including components such as an extension tube 8, a double-lumen catheter 1, and a connector 2.

[0027] The extended tube 8 is connected to the double-lumen catheter 1 via the connecting seat 2; there are two extended tubes 8, the connecting seat 2 is a three-way structure, and a diaphragm 3 is provided inside the double-lumen catheter 1, which separates the lumen of the double-lumen catheter 1 into two inlet cavities, which are connected to the two extended tubes 8 respectively. Different drugs can be injected into different inlet cavities through different extended tubes 8, thereby achieving the addition of different drugs.

[0028] The double-lumen catheter 1 has several side holes 4 and main holes 5 on its wall, which are connected to the two inlet lumens respectively. The medication in the inlet lumens can be delivered into the vein 10 through the side holes 4 and main holes 5.

[0029] The distal end of the double-lumen catheter 1 has a C-shaped segment 9, and the section between the C-shaped segment 9 and the connecting seat 2 is a straight tube. The C-shaped segment 9 bends into a C-shape in its natural state. In this design, when the double-lumen catheter 1 is inserted into a blood vessel, it will contact the blood vessel wall at the convex curved surface of the C-shaped segment 9, thereby reducing the risk of the double-lumen catheter 1 being in close contact with the blood vessel wall over a large area. That is, it does not affect blood flow, is less likely to cause blockage of the side holes 4 and the main hole 5, and is less likely to affect the delivery of medication.

[0030] After the double-lumen catheter 1 is inserted into the blood vessel, since the side hole 4 is located on the concave side of the C-shaped segment 9 and the main hole 5 is located at the end of the double-lumen catheter 1, the main hole and the side hole will not be directly attached to the blood vessel wall, thereby reducing the probability of blockage of the side hole 4 and the main hole 5.

[0031] Before inserting the double-lumen central venous catheter into the blood vessel, the outer end of the guidewire is inserted into the inlet lumen through the main hole 5. The guidewire enables the double-lumen catheter 1 to maintain a straight tube shape. The double-lumen central venous catheter is gradually inserted into the vein 10 along the guidewire, and then the guidewire is pulled out from the extension tube 8. After the guidewire is pulled out, the end of the double-lumen catheter 1 can change into a complete shape.

[0032] Example 2

[0033] like Figures 1 to 4 As shown, based on the structure of Example 1, the outer surface of the double-lumen catheter 1 is provided with an anticoagulant layer, which can be heparin. Bionic sharkskin microgrooves 6 are laser-etched on the outside of the double-lumen catheter 1. The width of the bionic sharkskin microgrooves 6 can be 20μm±1μm, and the depth can be 10μm±1μm. The bionic sharkskin microgrooves 6 are filled by the anticoagulant layer, thereby reducing the rate of heparin degradation over time and mitigating the problems of decreased anticoagulant effect and easy thrombosis after long-term placement of the double-lumen catheter 1.

[0034] The biomimetic shark skin microgroove 6 forms strip-shaped protrusions 7 on the outside of the double-lumen catheter 1. The two ends of the strip-shaped protrusions 7 are conical. Each strip-shaped protrusion 7 is separated by the biomimetic shark skin microgroove 6 and they do not connect. This makes the biomimetic shark skin microgroove 6 have both longitudinal and transverse parts, thereby reducing the resistance of the protrusions to blood and ensuring normal blood flow.

[0035] The above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation; it is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom remain within the scope of this technology.

Claims

1. A double-lumen central venous catheter with anti-wall adhesion and anticoagulant functions, characterized in that: It includes an extended tube (8), a double-lumen conduit (1), and a connecting seat (2); the extended tube (8) is connected to the double-lumen conduit (1) through the connecting seat (2); a diaphragm (3) is provided inside the double-lumen conduit (1), the diaphragm (3) divides the lumen of the double-lumen conduit (1) into two inlet cavities, and the two inlet cavities are connected to the two extended tubes (8); a side hole (4) and a main hole (5) are provided at the end of the double-lumen conduit (1), and the side hole (4) and the main hole (5) are connected to the two inlet cavities. The end of the double-lumen catheter (1) has a C-shaped section (9), which is bent into a C shape in its natural state. The side hole (4) is located on the concave side of the C-shaped section (9), and the main hole (5) is located at the end of the double-lumen catheter (1).

2. The dual lumen central venous catheter with anti-adhesion and anti- coagulation functions according to claim 1, characterized in that: The outer surface of the double-lumen catheter (1) is provided with an anticoagulant layer.

3. The dual lumen central venous catheter with anti-adhesion and anti- coagulation functions according to claim 2, characterized in that: The outside of the double-lumen catheter (1) is laser-etched with biomimetic shark skin microgrooves (6), which are filled with the anticoagulant layer.

4. The dual lumen central venous catheter with anti -sticking and anti -clotting functions according to claim 3, characterized in that: The biomimetic shark skin microgroove (6) creates strip-shaped protrusions (7) on the outside of the double-lumen catheter (1).

5. The dual lumen central venous catheter with anti -sticking and anti -clotting functions according to claim 4, characterized in that: The anticoagulant layer is made of heparin.

6. The dual lumen central venous catheter with anti -sticking and anti -clotting functions according to claim 3, characterized in that: The width of the biomimetic shark skin microgroove (6) is 20μm±1μm and the depth is 10μm±1μm.

7. The dual lumen central venous catheter with anti-adhesion and anti- coagulation functions according to any one of claims 1-6, characterized in that: Before the double-lumen central venous catheter is inserted into a blood vessel, a guidewire is inserted into the inlet lumen. The guidewire can keep the double-lumen catheter (1) in a straight tube shape and can be withdrawn from the extension tube (8).

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