Spiral tip hemodialysis catheter

Abstract

A spiral end head hemodialysis catheter comprises a catheter body, a partition, a venous lumen, an arterial lumen, and side openings at one end of the venous lumen and the arterial lumen, a spiral plate body is arranged at the distal end of the partition, both sides of the spiral plate body are integrally connected with the inner side of the catheter body, and venous spiral cavities and arterial spiral cavities are formed at the end of the catheter body; spiral side holes are arranged on the side walls of the catheter body at the inner ends of the two side cuts, and the two spiral side holes are respectively communicated with the venous lumen and the arterial lumen; the spiral plate body forms a spiral support structure on the inner wall of the catheter, increases the support area of the partition on the inner wall of the catheter, improves the kink resistance and fracture strength of the catheter tip, and makes the catheter have stronger stability in the vein; the spiral side holes arranged at the venous lumen and the arterial lumen form a long opening structure, improve the blood flowability, and the spiral side holes can produce spiral guiding effect, reduce blood accumulation, make blood inflow and outflow more smooth, and effectively reduce thrombus formation.

Description

Technical Field

[0001] This utility model relates to the field of medical catheters, and in particular to a hemodialysis catheter with a spiral tip. Background Technology

[0002] In recent years, the number of people requiring long-term hemodialysis has been increasing, and the durability and stability of long-term dialysis catheters have made them a popular choice for a considerable number of patients.

[0003] These patients often have to use catheter-based dialysis due to depletion of vascular resources or the inability to undergo peritoneal dialysis or kidney transplantation. As the indwelling time of the dialysis catheter increases, the probability of serious complications such as infection, thrombosis, catheter fibrin sheath formation, central venous stenosis or occlusion increases. Furthermore, issues such as catheter displacement and apposition to the wall during use also necessitate catheter replacement later on. Long-term dialysis catheters, often used for more than six months, cause varying degrees of damage to the central vein, and central venous stenosis and thrombosis reduce the effective volume of the catheter lumen.

[0004] Currently, long-term dialysis catheters used clinically are mainly classified into the following types based on their tips: 1. Split-tip type: This type requires more space and may cause more damage to the venous intima; 2. Stepped-tip type: This type has strict requirements for placement and the tip strength is relatively weak; 3. Symmetrical spiral Z-type: When the catheter adheres to the wall, it affects blood flow through the side holes, and thrombosis is prone to occur at the tip. At the same time, these types of tips have poor support stability for the catheter in the vein. Utility Model Content

[0005] To address the aforementioned problems, this invention proposes a spiral-ended hemodialysis catheter.

[0006] The technical solution of this utility model is: a helical-tipped hemodialysis catheter, including a catheter body, a septum, a venous lumen, an arterial lumen, and side openings at one end of the venous and arterial lumen. The catheter body is made of TPU or silicone material and has a certain degree of flexibility. A helical plate is provided at the distal end of the septum. The helical plate and the septum are integrally formed and tangentially connected to form a smoothly transitioned plate structure. Both sides of the helical plate are integrally connected to the inner side of the catheter body. A venous helical cavity and an arterial helical cavity are formed at the end of the catheter body. The venous helical cavity and the arterial helical cavity have the same volume and size.

[0007] Preferably, the inner ends of the catheter body on both sides are provided with spiral side holes, which are respectively connected to the venous lumen and the arterial lumen. The two openings are arranged in opposite directions, and the spiral directions of the two spiral side holes are arranged in opposite directions. The edges of the spiral side holes and the two side openings are provided with rounded corners, and the edges of the port of the catheter body are provided with rounded corners.

[0008] Preferably, the side wall of the conduit body at the side opening is a spiral wall, and the spiral side hole is integrally spirally connected to the spiral wall, so that the side opening and the spiral side hole are connected.

[0009] Preferably, the spiral tube wall and the spiral side hole together have 1-3 spiral turns.

[0010] Preferably, the spiral plate has 1-3 spiral turns, and the inner end of the spiral plate and the inner end of the spiral side hole are located in the same radial plane.

[0011] Preferably, the other end of the catheter body is provided with a double-lumen tube seat, both sides of the double-lumen tube seat are provided with fixing wings, two extension tubes are connected to the double-lumen tube seat, the outer end of the extension tube is provided with an adapter, and the extension tube is provided with a buckle.

[0012] Preferably, the catheter body is provided with a polyester sleeve.

[0013] The beneficial technical effects of this utility model are: (1) The septum at the tip of the catheter is designed as a spiral plate, which forms a spiral support structure on the inner wall of the catheter, increases the support area of ​​the septum on the inner wall of the catheter, improves the kink resistance and fracture strength of the catheter tip, and makes the catheter more stable in the vein.

[0014] (2) The spiral side holes set at the venous lumen and arterial lumen form a long opening structure, which improves the flow of blood. The spiral side holes can also produce a spiral guiding effect, reduce blood accumulation, make the inflow and outflow smoother, and effectively reduce the formation of thrombi.

[0015] (3) The integrated connection of the side opening and the spiral side hole increases the opening of the side opening, which helps to reduce the occurrence of blockage caused by blood clots in the dialysis catheter. Attached Figure Description

[0016] Figure 1 This is one of the three-dimensional structural schematic diagrams of this utility model; Figure 2 This is the second three-dimensional structural schematic diagram of this utility model; Figure 3 This is a side view structural diagram of the present invention; Figure 4 yes Figure 3 A schematic diagram of the AA-direction cross-section structure; Figure 5 yes Figure 4 A magnified view of a portion of the image; Figure 6 yes Figure 5 Schematic diagram of the BB-direction cross-section structure; Figure 7This is a schematic diagram of the structure after rounding the corners on the main body of the catheter; Figure 8 This is a schematic diagram of the catheter body without spiral side holes.

[0017] In the diagram, 1. Catheter body, 11. Venous lumen, 111. Venous spiral lumen, 12. Arterial lumen, 121. Arterial spiral lumen, 13. Septum, 131. Spiral plate, 14. Side opening, 15. Spiral side hole, 16. Spiral tube wall, 17. Rounded corner, 21. Double lumen seat, 22. Extension tube, 23. Snap fastener, 24. Polyester sleeve. Detailed Implementation

[0018] Example 1, see appendix Figure 1-2 8. A helical-tipped hemodialysis catheter includes a catheter body 1, a septum 13, a venous lumen 11, an arterial lumen 12, and side openings 14 at one end of the venous lumen 11 and the arterial lumen 12. The venous lumen 11 and the arterial lumen 12 have the same cross-sectional dimensions. A helical plate 131 is provided at the distal end of the septum 13. Both sides of the helical plate 131 are integrally connected to the inner surface of the catheter body 1, forming a venous helical cavity 111 and an arterial helical cavity 121 at the end of the catheter body 1. The helical plate 131 forms a helical support structure on the inner wall of the catheter, increasing the support area of ​​the septum 13 on the inner wall of the catheter, improving the kink resistance and fracture strength of the catheter tip, and making the catheter more stable in the vein.

[0019] The other end of the catheter body 1 is provided with a double-lumen tube seat 21. Both sides of the double-lumen tube seat 21 are provided with fixing wings, each with a suture hole for sewing onto the skin during initial catheter placement to secure the catheter body 1. Two extension tubes 22 are connected to the double-lumen tube seat 21. The ends of the extension tubes 22 are equipped with Luer connectors for easy matching with heparin caps, syringes, and dialysis tubing. The extension tubes 22 are also equipped with clips 23 to prevent backflow of blood or other fluids and to avoid air embolism.

[0020] The catheter body 1 is provided with a polyester sleeve 24, which is tightly fitted onto the outer side of the catheter body 1.

[0021] Example 2, see appendix Figure 1-6 This embodiment is basically the same as Embodiment 1, and the similarities will not be repeated. The difference is that the inner end of the catheter body 1 on both sides is provided with a spiral side hole 15. The two spiral side holes 15 are respectively connected to the venous lumen 11 and the arterial lumen 12. The spiral side holes 15 form a long opening structure, which improves the flow of blood. In addition, the spiral side holes 15 can generate a spiral guiding effect, reduce blood accumulation, make the inflow and outflow smoother, and effectively reduce the formation of thrombi.

[0022] The side wall of the catheter body 1 at the side opening 14 is a spiral tube wall 16. The spiral side hole 15 is integrally spirally connected to the spiral tube wall 16. The integral connection between the side opening 14 and the spiral side hole 15 increases the opening of the side opening, which helps to reduce the occurrence of blood clots causing blockage in the dialysis catheter.

[0023] The spiral wall 16 and spiral side hole 15 have 1-3 spiral turns as a whole, and the spiral plate 131 has 1-3 spiral turns. Different models of dialysis catheters are formed by setting different numbers of spiral plate 131 and spiral side hole 15, which can be selected for patients with different conditions.

[0024] Example 3, see appendix Figure 7 This embodiment is basically the same as embodiment two, and the similarities will not be repeated. The difference is that the spiral side hole 15 and the edges on both sides of the lateral opening are provided with rounded corners 17. At the same time, the edge of the port of the catheter body 1 is provided with rounded corners 17 to reduce the damage to blood cells caused by sharp edges.

Claims

1. A spiral-tipped hemodialysis catheter, comprising a catheter body, a septum, a venous lumen, an arterial lumen, and lateral openings at one end of the venous and arterial lumens, characterized in that: The distal end of the septum is provided with a spiral plate, both sides of which are integrally connected to the inner side of the catheter body, forming a venous spiral cavity and an arterial spiral cavity at the end of the catheter body.

2. The helical-tipped hemodialysis catheter according to claim 1, characterized in that: The catheter body has spiral side holes on the inner walls of both openings, which are connected to the venous lumen and the arterial lumen, respectively.

3. The spiral-tipped hemodialysis catheter according to claim 2, characterized in that: The edges of the spiral side hole and the side opening on both sides are rounded, and the edge of the port of the conduit body is also rounded.

4. The spiral-tipped hemodialysis catheter according to claim 2, characterized in that: The side wall of the conduit body at the side opening is a spiral wall, and the spiral side hole is integrally spirally connected to the spiral wall.

5. A spiral-tipped hemodialysis catheter according to claim 4, characterized in that: The spiral tube wall and spiral side hole together have 1-3 spiral turns.

6. A spiral-tipped hemodialysis catheter according to claim 5, characterized in that: The spiral plate has 1-3 spiral turns.

7. The helical-tipped hemodialysis catheter according to claim 1, characterized in that: The other end of the catheter body is provided with a double-lumen tube seat, and two extension tubes are connected to the double-lumen tube seat. The extension tubes are provided with buckles.

8. The spiral-tipped hemodialysis catheter according to claim 1, characterized in that: The catheter body is provided with a polyester sleeve.

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