Dual-lumen hemodialysis catheter

Abstract

This utility model relates to the field of dialysis technology and discloses a dual-lumen hemodialysis catheter, including a tube body with a pointed end and a rounded end along its length. A first chamber is formed inside the pointed end, and the chamber wall of the first chamber extends into the rounded end. A second annular chamber is formed between the rounded end and the chamber wall of the first chamber. A venous return port is provided at the pointed end, connecting to the first chamber, and an arterial bleeding port is provided at the rounded end, connecting to the second chamber. The venous return port and the arterial bleeding port have the same diameter. By standardizing the diameter of the two lumens, the same cutting tool and processing parameters can be used to complete the dual-lumen incision, eliminating the need for frequent tool changes or process adjustments due to diameter differences. This significantly reduces equipment downtime, shortens cycle time, improves production efficiency, and avoids abnormal tool wear caused by switching between multiple tool sizes.

Description

Technical Field

[0001] This utility model relates to the field of vascular dialysis technology, and in particular to a dual-lumen hemodialysis catheter. Background Technology

[0002] Currently, the production of dual-lumen hemodialysis catheters generally employs traditional cutting processes to drill holes in the sidewalls of the two lumens. However, existing technologies have the following significant drawbacks: When drilling the side lumens, insufficient matching between the cutting tool and the material easily leads to hole diameters exceeding design tolerances, and the cutting tools experience severe wear during processing, significantly shortening their service life. Furthermore, the cutting process easily generates quality problems such as burrs and tube deformation, affecting the catheter's hydrodynamic performance and clinical safety. Existing technologies require inserting a tube into the lumen before drilling to provide support. This process necessitates additional equipment for tube extrusion, cutting, and plugging, increasing tube storage and management costs and extending the production process. Simultaneously, the plugging process may cause scratches to the catheter's inner wall, further impacting the finished product yield. Because the two lumens of a dual-lumen catheter have different functional requirements, their hole diameters and drilling depths differ, requiring separate processing with different cutting tools and process parameters. This results in high tool change frequency, extended cycle times, and low production efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a dual-lumen hemodialysis catheter that reduces equipment downtime, shortens process cycle time, improves production efficiency, and extends the service life of cutting tools.

[0004] To achieve the above objectives, this utility model provides a dual-lumen hemodialysis catheter, comprising a tube body with a pointed end and a rounded end at its two ends along its length. A first chamber is formed inside the pointed end, and the chamber wall of the first chamber extends into the rounded end. An annular second chamber is formed between the rounded end and the chamber wall of the first chamber. The pointed end has a venous return port communicating with the first chamber, and the rounded end has an arterial bleeding port communicating with the second chamber. The venous return port and the arterial bleeding port have the same diameter.

[0005] Compared with the prior art, the beneficial effects of this embodiment of the dual-lumen hemodialysis catheter are as follows: the catheter body is connected to the venous end blood return hole through the first chamber for venous blood return, and the arterial end bleeding hole through the second chamber for arterial blood transfusion. The venous end blood return hole and the arterial end bleeding hole are the same size. By unifying the diameter specifications of the two lumens, the same cutting tool and processing parameters can be used to complete the dual-lumen cutting, eliminating the need for frequent tool changes or process adjustments due to diameter differences. This significantly reduces equipment downtime, shortens the cycle time, and improves production efficiency. Moreover, the use of a single cutting tool to match the uniform diameter avoids the problem of abnormal tool wear caused by switching between multiple tool specifications. It also reduces the risk of edge chipping caused by parameter fluctuations during cutting, extending the tool's service life. In addition, the uniform diameter design can reduce problems such as diameter deviation, burrs, and tube deformation caused by differences in tool specifications or tool change errors, ensuring the dimensional accuracy and surface quality of the dual-lumen structure, and improving the catheter's fluid performance and clinical safety.

[0006] The dual-lumen hemodialysis catheter of this utility model embodiment has multiple venous return holes at its tip.

[0007] In this embodiment of the utility model, the two venous end blood return holes are arranged opposite each other to form a group of venous end blood return holes, and multiple groups of venous end blood return holes are arranged at intervals along the length of the tube body.

[0008] In this embodiment of the double-lumen hemodialysis catheter, the adjacent venous end blood return holes are staggered in the radial direction of the catheter body.

[0009] The dual-lumen hemodialysis catheter of this utility model embodiment has multiple arterial bleeding holes at its round end.

[0010] In this embodiment of the utility model, the two arterial bleeding holes are arranged opposite each other to form a group of arterial bleeding holes, and multiple groups of arterial bleeding holes are arranged at intervals along the length of the tube.

[0011] In this embodiment of the dual-lumen hemodialysis catheter, the adjacent arterial end bleeding holes are staggered in the radial direction of the catheter body.

[0012] In this embodiment of the dual-lumen hemodialysis catheter, both the venous end blood return hole and the arterial end bleeding hole are circular holes.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the structure of the dual-lumen hemodialysis catheter according to an embodiment of the present invention;

[0015] Figure 2 This is a schematic cross-sectional view of the dual-lumen hemodialysis catheter according to an embodiment of the present invention;

[0016] In the diagram, 1 is the tube body; 11 is the tip; 12 is the round end; 2 is the first chamber; 21 is the first chamber; 22 is the chamber wall; 3 is the second chamber; and 32 is the bleeding hole at the arterial end. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0018] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0020] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0021] like Figure 1 and Figure 2As shown, a preferred embodiment of the present invention provides a dual-lumen hemodialysis catheter, comprising a tube body 1, with a pointed end 11 and a rounded end 12 at its two ends along its length. A first chamber 2 is formed inside the pointed end 11, which communicates with a vein. The chamber wall 22 of the first chamber 2 extends into the rounded end 12. An annular second chamber 3 is formed between the rounded end 12 and the chamber wall 22 of the first chamber 2, and the second chamber 3 communicates with an artery. The first chamber 2 and the second chamber 3 are completely separated and do not communicate with each other. The pointed end 11 has a venous return port 21 communicating with the first chamber 2, and the rounded end 12 has an arterial bleeding port 32 communicating with the second chamber 3. The venous return port 21 and the arterial bleeding port 32 have the same diameter.

[0022] The tube body 1 is connected to the venous end blood return port 21 through the first chamber 2 for venous blood return, and the arterial end bleeding port 32 connected to the second chamber 3 for arterial blood transfusion. The venous end blood return port and the arterial end bleeding port 32 are the same size. By unifying the orifice specifications of the two chambers, the same tool and processing parameters can be used to complete the double-lumen cutting. There is no need to frequently change tools or adjust the process due to differences in orifice size, which significantly reduces equipment downtime, shortens the cycle time, and improves production efficiency. Moreover, the single tool matched with the uniform orifice size avoids the problem of abnormal tool wear caused by switching between multiple tool specifications. At the same time, it reduces the risk of edge chipping caused by parameter fluctuations during the cutting process and extends the tool life. In addition, the uniform orifice design can reduce problems such as orifice size deviation, burrs and tube body 1 deformation caused by differences in tool specifications or tool change errors, ensuring the dimensional accuracy and surface quality of the double-lumen orifice structure, and improving the fluid performance and clinical safety of the catheter.

[0023] In some embodiments of this invention, the tip 11 has multiple venous return holes 21. By providing multiple venous return holes 21, the fluid pressure during blood return can be dispersed, avoiding excessive local negative pressure or blood cell damage caused by concentrated drainage from a single hole. Simultaneously, it enhances the uniformity of blood flow, reduces turbulence, and thus optimizes the catheter's hydrodynamic performance. Furthermore, the total flow area of ​​the multiple small-diameter return holes is similar to that of a single large hole, but the dispersed design reduces stress concentration at the edge of a single hole, lowering the risk of tube deformation and cracking due to stress concentration during processing or use, further ensuring the stability of the catheter structure. During processing, the multi-hole design allows for batch processing using uniform tool parameters, avoiding the problem of increased tool load caused by excessively large single-hole sizes. It also reduces burr defects caused by material accumulation during cutting, improving processing accuracy and yield.

[0024] Understandably, a multi-hole, dispersed layout can also reduce the probability of complete blockage of a single hole due to thrombosis or tissue coverage. Even if some holes are blocked, the remaining holes can still maintain effective blood return function, thereby improving the reliability of the catheter in clinical use.

[0025] In some embodiments of this utility model, two venous return ports 21 are arranged opposite each other to form a group of venous return ports 21. Multiple groups of venous return ports 21 are arranged at intervals along the length of the tube body 1. By distributing multiple groups of venous return ports 21 opposite each other along the length of the tube body 1, a uniform blood return path is formed, reducing local flow velocity differences and reducing damage to blood cells from turbulence and shear stress. At the same time, it avoids the problem of tube body 1 vibration or displacement caused by concentrated blood return at a single point, improving the stability of catheter use. Multiple groups of return ports form redundant channels. Even if one group of ports is partially blocked by thrombus or tissue adhesion, other groups of ports can still maintain effective blood return function, significantly reducing the risk of complete blockage and extending the clinical service life of the catheter.

[0026] In some embodiments of this utility model, the adjacent venous end blood return holes 21 are arranged in an alternating manner in the radial direction of the tube body 1. The radially alternating arrangement of adjacent hole groups can disperse the local impact force of blood return, avoid the turbulence superposition effect caused by the superposition of multiple holes in the same straight direction, improve the symmetry of the flow field distribution, reduce the risk of blood cells rupture due to shear stress concentration, and improve the safety of dialysis.

[0027] In some embodiments of this utility model, the round end 12 is provided with multiple arterial bleeding holes 32. The multi-hole distributed arterial bleeding hole 32 layout can reduce the problem of concentrated blood flow pressure in a single hole, making the blood flow velocity more uniform during output, reducing turbulence and shear stress on the blood vessel wall, and reducing the risk of hemolysis. The multi-hole distribution forms redundant blood flow channels. Even if some holes are temporarily blocked by thrombus, the remaining holes can still maintain effective blood output function, reducing the risk of complete occlusion. The regular multi-hole design can achieve batch processing through preset hole spacing parameters, reducing the complex positioning adjustment required for traditional irregular hole processing, and improving production efficiency and hole diameter consistency.

[0028] In some embodiments of this invention, two arterial bleeding holes 32 are arranged opposite each other to form a group of arterial bleeding holes 32, and multiple groups of arterial bleeding holes 32 are arranged at intervals along the length of the tube body 1. In some embodiments of this invention, adjacent groups of arterial bleeding holes 32 are staggered in the radial direction of the tube body 1. The staggered and uniformly arranged arterial bleeding holes 32 function similarly to the venous return holes 21, which can form a uniform blood return path, reduce local flow velocity differences, significantly reduce the risk of complete blockage, extend the clinical life of the catheter, and improve dialysis safety.

[0029] In some embodiments of this invention, both the venous return orifice 21 and the arterial bleeding orifice 32 are circular orifices. The smooth edges of the circular orifices significantly reduce the turbulence intensity when blood flows through the orifice, minimizing sudden changes in local shear stress caused by irregular orifice shapes, thereby reducing the risk of mechanical hemolysis of red blood cells. Simultaneously, the circular orifice cross-section provides a more uniform flow velocity distribution, improving the exchange efficiency between blood and dialysate.

[0030] In summary, this utility model provides a dual-lumen hemodialysis catheter that eliminates the need for frequent tool replacements or process adjustments due to differences in orifice diameter, significantly reducing equipment downtime, shortening cycle time, improving production efficiency, avoiding abnormal tool wear, and extending tool life. Furthermore, the standardized orifice diameter design reduces issues such as orifice diameter deviations, burrs, and tube deformation caused by differences in tool specifications or tool replacement errors, ensuring the dimensional accuracy and surface quality of the dual-lumen structure, and improving catheter fluid performance and clinical safety.

[0031] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.

Claims

1. A double-lumen hemodialysis catheter, characterized in that: The device includes a tube with a pointed end and a rounded end at its two ends along its length. A first chamber is formed inside the pointed end, and the wall of the first chamber extends into the rounded end. An annular second chamber is formed between the rounded end and the wall of the first chamber. The pointed end has a venous return port that communicates with the first chamber, and the rounded end has an arterial bleeding port that communicates with the second chamber. The venous return port and the arterial bleeding port have the same diameter.

2. The dual-lumen hemodialysis catheter according to claim 1, characterized in that: The tip has multiple venous return holes.

3. The dual-lumen hemodialysis catheter according to claim 2, characterized in that: Two venous return holes are arranged opposite each other to form a group of venous return holes, and multiple groups of venous return holes are arranged at intervals along the length of the tube.

4. The dual-lumen hemodialysis catheter according to claim 3, characterized in that: The adjacent venous end blood return holes are staggered in the radial direction of the tube body.

5. The dual-lumen hemodialysis catheter according to claim 1, characterized in that: The round end has multiple bleeding holes at the arterial end.

6. The dual-lumen hemodialysis catheter according to claim 5, characterized in that: Two arterial bleeding holes are arranged opposite each other to form a group of arterial bleeding holes, and multiple groups of arterial bleeding holes are arranged at intervals along the length of the tube.

7. The dual-lumen hemodialysis catheter according to claim 6, characterized in that: The adjacent arterial end bleeding holes are staggered in the radial direction of the tube body.

8. The dual-lumen hemodialysis catheter according to claim 1, characterized in that: Both the venous end blood return hole and the arterial end bleeding hole are circular holes.

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