Three-cavity micro catheter for coronary heart disease surgery

Abstract

The invention discloses a three-cavity micro catheter for coronary heart disease surgery, and relates to the technical field of medical equipment. Comprising a microcatheter body, and a first through cavity and a second through cavity are formed in the microcatheter body; a micro-catheter front end is arranged at the head end of the micro-catheter body; the first through cavity penetrates through the front end of the microcatheter and forms a first cavity opening, and the first through cavity penetrates through the tail end of the microcatheter body and is provided with a first cavity tube; the second through cavity penetrates through the front end of the micro catheter and forms a second cavity opening, and the second through cavity penetrates through the tail end of the micro catheter body and is provided with a second cavity tube; the front end of the micro-catheter is provided with a third cavity tube adjacent to the second through cavity, a third through cavity is arranged in the third cavity tube, the third through cavity penetrates through the third cavity tube, the head end of the third through cavity is provided with a third through cavity outlet, the head end of the third cavity tube is longer than the second cavity opening, and the third through cavity is provided with a third through cavity inlet at the joint of the third cavity tube and the front end of the micro-catheter. According to the three-cavity microcatheter, a clear contrast image can be obtained with a small amount of contrast agent, the advancing direction of the guide wire can be guided at any time, and efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to a three-lumen microcatheter for coronary artery disease surgery. Background Technology

[0002] Coronary artery disease (CAD), a serious cardiovascular disease threatening human health, has a persistently high incidence and mortality rate. Chronic total occlusion (CTO) of the coronary arteries is one of the more challenging types of CAD, accounting for about one-third of all coronary angiography cases, but less than 8% of these patients undergo percutaneous coronary intervention (PCI), representing approximately 15% to 30% of all PCI cases. Interventional treatment of CTO lesions faces numerous challenges, with the difficulty of successfully traversing the lesion and entering the true lumen being one of the biggest obstacles.

[0003] In interventional coronary intervention (ACT) procedures, dual-lumen microcatheters play a crucial role. However, existing dual-lumen microcatheters have several drawbacks, leading to poor efficacy in treating complex lesions. The tip of current dual-lumen microcatheters is typically rounded, a shape that is not ideal for guiding, protecting, and intervening with the guidewire, making it difficult to accurately control the guidewire's direction of advancement. For complex CTO lesions and bifurcation lesions, such as those with angular tortuosity or calcified occlusion of the side branches, existing dual-lumen microcatheters often fail to allow the guidewire to pass through, significantly reducing the effectiveness of the intervention.

[0004] Existing dual-lumen microcatheters typically have rounded tips, which are less than ideal for guiding, protecting, and intervening with guidewires, making it difficult to accurately control the guidewire's direction. Their rounded tips also hinder the rapid entry of the guidewire into the side branches for protection and intervention, increasing both procedure time and operational risk. For complex CTO lesions and bifurcation lesions (with angular tortuosity or calcified occlusion of side branches), existing dual-lumen microcatheters cannot accommodate guidewires, resulting in poor interventional outcomes and further increasing procedure time and risk. Furthermore, existing dual-lumen microcatheters have limitations in visualization, making it difficult to clearly show the catheter's position and trajectory during the procedure, which is detrimental to accurate manipulation by the physician. Summary of the Invention

[0005] The purpose of this invention is to provide a three-lumen microcatheter for coronary artery disease surgery to solve the above-mentioned problems. It enables the use of less contrast agent to obtain clear angiographic images, provides real-time guidance for guidewire advancement, and improves efficiency.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a three-lumen microcatheter for coronary artery disease surgery, comprising a microcatheter body, wherein the microcatheter body has a first lumen and a second lumen inside; the microcatheter body has a microcatheter tip at its head end; the first lumen penetrates the microcatheter tip and forms a first port, the first lumen penetrates the tail end of the microcatheter body and forms a first tube; the second lumen penetrates the microcatheter tip and forms a second port, the second lumen penetrates the tail end of the microcatheter body and forms a second tube; the microcatheter tip is adjacent to the second lumen and has a third tube, the third tube has a third lumen inside, the third lumen penetrates the third tube and has a third lumen outlet at its head end, the head end of the third tube extends beyond the second port, and the third lumen has a third lumen inlet at the connection between the third tube and the microcatheter tip.

[0007] The present invention is further configured such that the tip of the microcatheter is a streamlined cone shape.

[0008] The present invention is further configured such that: the first cavity is located on the side of the front end of the microcatheter; and the second cavity is located at the end of the front end of the microcatheter.

[0009] The present invention is further configured such that the distance between the first cavity and the second cavity is 1mm-5mm.

[0010] The present invention is further configured such that the distance between the outlet of the third cavity and the outlet of the second cavity is 1mm-5mm.

[0011] The present invention is further configured such that: the inner diameter of the first through cavity is 0.75mm-1.00mm; the inner diameter of the second through cavity is 0.36mm-0.38mm; and the inner diameter of the third through cavity is 0.36mm-0.38mm.

[0012] The present invention is further configured such that: the first cavity tube has a certain degree of curvature, and the second cavity tube is a straight tube.

[0013] The present invention is further configured such that the length of the third cavity tube is 200mm-250mm.

[0014] The present invention is further configured such that the length of the three-lumen microcatheter is 1200mm-1500mm.

[0015] The present invention is further configured such that the length of the three-lumen microcatheter is 1350 mm or 1500 mm.

[0016] In summary, the present invention has the following beneficial effects:

[0017] 1. Improve surgical efficiency: Superselective angiography reduces the amount of contrast agent used by more than 50%, and provides real-time guidance for guidewire direction, avoiding blind exploration and shortening surgical time.

[0018] 2. Reduced operational risks: The streamlined, conical tip of the microcatheter and its precise lumen design reduce vascular damage, and the contrast markers reduce the risk of complications such as perforation and dissection.

[0019] 3. Enhanced operational flexibility: The three chambers have clearly defined functions, supporting multiple operations such as guidewire replacement, parallel guidewire, medication administration, and thrombectomy, and are especially suitable for complex CTO lesions and bifurcation lesions.

[0020] 4. Compatible with existing equipment: The size is compatible with various guiding catheters and conventional guidewires and instruments, eliminating the need for additional surgical equipment replacement. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the left side of the three-lumen microcatheter in an embodiment of the present invention;

[0022] Figure 2 This is a right-side view of the three-lumen microcatheter in an embodiment of the present invention;

[0023] Figure 3 This is a bottom-view schematic diagram of the three-lumen microcatheter in an embodiment of the present invention.

[0024] In the figure: 1. Microcatheter body; 2. Microcatheter tip; 3. First lumen; 4. Second lumen; 5. First lumen opening; 6. Second lumen opening; 7. Third lumen; 8. Third lumen outlet; 9. Third lumen inlet. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-3 The present invention will be described in further detail below.

[0026] Example: A three-lumen microcatheter for coronary artery disease surgery, such as Figure 1 , Figure 2 and Figure 3 As shown, the device includes a microcatheter body 1, which has a first cavity and a second cavity inside. The microcatheter body 1 has a microcatheter tip 2 at its head end. The first cavity passes through the microcatheter tip 2 and forms a first lumen 5. The first cavity passes through the tail end of the microcatheter body 1 and has a first lumen tube 3. The second cavity passes through the microcatheter tip 2 and forms a second lumen 6. The second cavity passes through the tail end of the microcatheter body 1 and has a second lumen tube 4. The microcatheter tip 2 is adjacent to the second cavity and has a third lumen tube 7. The third lumen tube 7 has a third cavity inside. The third cavity passes through the third lumen tube 7 and has a third cavity outlet 8 at its head end. The head end of the third lumen tube 7 extends beyond the second lumen 6. The third cavity has a third cavity inlet 9 at the connection between the third lumen tube 7 and the microcatheter tip 2.

[0027] Furthermore, the microcatheter body 1 and the microcatheter tip 2 are manufactured as a single unit. The microcatheter tip 2 is a streamlined cone shape with a smooth surface and an X-ray-proof imaging mark at the first lumen 5 position, which can clearly show the position and direction of the catheter during the operation.

[0028] Furthermore, the first lumen 5 is located on the side of the microcatheter tip 2; the second lumen 6 is located at the end of the microcatheter tip 2. The distance between the first lumen 5 and the second lumen 6 is 1mm-5mm. The distance between the third lumen outlet 8 and the second lumen 6 is 1mm-5mm.

[0029] The distance between the first cavity 5 and the second cavity 6, and the distance between the third cavity outlet 8 and the second cavity 6, can be adjusted to allow for the selection of different specifications of three-lumen microcatheters, such as 1mm, 2mm, 3mm, 4mm, and 5mm, depending on the surgical requirements.

[0030] Furthermore, the inner diameter of the first through cavity is 0.75mm-1.00mm; the inner diameter of the second through cavity is 0.36mm-0.38mm; and the inner diameter of the third through cavity is 0.36mm-0.38mm.

[0031] The first lumen (large lumen) has an inner diameter of 0.75mm-1.00mm, suitable for thrombus aspiration and angiography; the second lumen (small lumen) has an inner diameter of 0.36mm-0.38mm, only allowing conventional coronary PTCA guidewires to pass through; the third lumen (short lumen) has an inner diameter of 0.36mm-0.38mm, suitable for rapid exchange of working guidewires, allowing the microcatheter to accurately reach the target vessel segment.

[0032] Furthermore, the first lumen 3 is a flexible tube with a certain degree of curvature, ranging from 15° to 30°, while the second lumen 4 is a straight tube. This Y-shaped design facilitates surgical procedures.

[0033] Furthermore, the length of the third lumen tube 7 is 200mm-250mm, and the length of the three-lumen microcatheter is 1200mm-1500mm. Specifically, the length of the three-lumen microcatheter is 1350mm or 1500mm, adapted to the length of existing guidewires.

[0034] Furthermore, the microcatheter body 1 is made of medical-grade thin-walled polymer materials, such as polyimide, to ensure flexibility and pressure resistance.

[0035] The three-lumen microcatheter of this invention is elliptical in shape, with an outer diameter of approximately 1.65mm × 1.50mm. The first lumen is used for superselective angiography and intracoronary drug administration (such as nitroglycerin), and can be used for thrombectomy or insertion of a spare guidewire if necessary. The second lumen has a dedicated CTO guidewire channel to prevent guidewire deviation. The third lumen is a rapid guidewire exchange channel to guide the microcatheter precisely to the target vessel segment. The streamlined tip reduces vessel wall damage and lowers the risk of perforation; the lumen spacing design (1-5mm) avoids guidewire interference while ensuring precise application of contrast agent to the guidewire tip area; the Y-shaped tail and the first lumen 3 are flexible tubes with a certain curvature, while the second lumen 4 is a straight tube, facilitating one-handed operation by the physician.

[0036] This invention involves inserting a working guidewire through the third port to guide the tip 2 of the microcatheter to the vicinity of the target coronary artery segment, and then withdrawing the working guidewire. A dedicated CTO guidewire is then inserted through the second port, slowly traversing the chronically occluded segment. During this process, a small amount of contrast agent is injected through the first port, and the guidewire direction is adjusted based on the contrast enhancement. If the guidewire enters the false lumen, a spare guidewire is inserted through the first port for parallel guidewire manipulation. If coronary medication is required, nitroglycerin or other drugs are injected through the first port. If a thrombus is present, thrombectomy can be performed through the first port.

[0037] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A three-lumen microcatheter for coronary artery disease surgery, characterized in that, The device includes a microcatheter body (1), which has a first cavity and a second cavity inside. The microcatheter body (1) has a microcatheter tip (2) at its head end. The first cavity passes through the microcatheter tip (2) and forms a first cavity (5). The first cavity passes through the tail end of the microcatheter body (1) and has a first cavity tube (3). The second cavity passes through the microcatheter tip (2) and forms a second cavity (6). The second cavity passes through the tail end of the microcatheter body (1) and has a second cavity tube (4). The microcatheter tip (2) is adjacent to the second cavity and has a third cavity tube (7). The third cavity tube (7) has a third cavity inside. The third cavity passes through the third cavity tube (7) and has a third cavity outlet (8) at its head end. The head end of the third cavity tube (7) is longer than the second cavity (6). The third cavity tube (7) has a third cavity inlet (9) at the connection between the third cavity tube (7) and the microcatheter tip (2).

2. The three-lumen microcatheter for coronary artery disease surgery according to claim 1, characterized in that, The tip of the microcatheter (2) is a streamlined cone shape.

3. A three-lumen microcatheter for coronary artery disease surgery according to claim 2, characterized in that, The first cavity (5) is located on the side of the microcatheter tip (2); the second cavity (6) is located at the end of the microcatheter tip (2).

4. A three-lumen microcatheter for coronary artery disease surgery according to claim 3, characterized in that, The distance between the first cavity (5) and the second cavity (6) is 1mm-5mm.

5. A three-lumen microcatheter for coronary artery disease surgery according to claim 1, characterized in that, The distance between the third cavity outlet (8) and the second cavity outlet (6) is 1mm-5mm.

6. A three-lumen microcatheter for coronary artery disease surgery according to claim 1, characterized in that, The inner diameter of the first through cavity is 0.75mm-1.00mm; the inner diameter of the second through cavity is 0.36mm-0.38mm; and the inner diameter of the third through cavity is 0.36mm-0.38mm.

7. A three-lumen microcatheter for coronary artery disease surgery according to claim 1, characterized in that, The first cavity tube (3) has a certain degree of curvature, and the second cavity tube (4) is a straight tube.

8. A three-lumen microcatheter for coronary artery disease surgery according to claim 1, characterized in that, The length of the third cavity tube (7) is 200mm-250mm.

9. A three-lumen microcatheter for coronary artery disease surgery according to claim 1, characterized in that, The length of the three-lumen microcatheter is 1200mm-1500mm.

10. A three-lumen microcatheter for coronary artery disease surgery according to claim 9, characterized in that, The length of the three-lumen microcatheter is 1350 mm or 1500 mm.

Images