Three-cavity micro catheter
By designing the sub-tube length gradient, filling layer, and core wire structure of the three-lumen microcatheter, the problems of insufficient support and pushability in the existing technology are solved, which improves the success rate of CTO-PCI surgery and the accuracy of drug infusion, and reduces the difficulty and risk of surgery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-02
- Publication Date
- 2026-03-27
AI Technical Summary
Existing three-lumen microcatheters are inadequate in terms of support and delivery, resulting in high difficulty and risk during CTO-PCI procedures, as well as poor drug infusion function.
A three-lumen microcatheter was designed, including a first sub-tube, a second sub-tube, and a third sub-tube. The outer layer is wrapped with a filling layer and the inner core wire is installed. The sub-tubes have a gradient length design, and the distal end is adjustable for bending. The material is soft and has radiopaque markers, providing support and pushing force, thereby enhancing the support and pushing ability of the catheter.
It improves the success rate and operational flexibility of the surgery, reduces the risk of catheter bending in complex blood vessels, enhances the accuracy and therapeutic effect of drug infusion, and reduces the difficulty and risk of the surgery.
Smart Images
Figure CN121731629A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of medical devices, and more particularly, to a three-lumen microcatheter. BACKGROUND
[0002] CTO lesions, i.e. Chronic Total Occlusion (CTO) lesions, the treatment strategies for CTO lesions mainly include drug therapy, coronary artery bypass grafting (CABG) and percutaneous coronary intervention (PCI).
[0003] Among them, CTO-PCI operation is a complex and high-risk treatment technology. During the operation, the phenomenon of coronary no-reflow may occur, that is, although the occluded segment has been opened, the distal blood vessels have not recovered effective blood flow. In order to improve this situation, doctors may inject some drugs such as nitroglycerin, verapamil, etc. through the microcatheter in the distal blood vessels to help dilate the blood vessels and improve blood circulation. If acute thrombosis exists in the CTO lesion, the doctor will also inject thrombolytic drugs such as urokinase, streptokinase, etc. during the operation to dissolve the thrombus and restore blood flow.
[0004] At present, the three-lumen microcatheter used in the operation in the prior art generally has the problem of poor support and pushability and drug infusion function. Therefore, it is necessary to provide a new technical scheme to at least solve one of the above technical problems. SUMMARY
[0005] One object of the present application is to provide a new technical scheme of a three-lumen microcatheter.
[0006] According to a first aspect of the present application, a three-lumen microcatheter is provided, comprising: a first sub-tube, a second sub-tube and a third sub-tube; at a distal end, the first sub-tube, the second sub-tube and the third sub-tube are arranged side by side in sequence; the length of the first sub-tube and the length of the second sub-tube are both greater than the length of the third sub-tube; a filling layer and a core wire, the filling layer is wrapped outside the first sub-tube, the second sub-tube and the third sub-tube, and the core wire is arranged in the filling layer.
[0007] Optionally, the filling layer comprises a first filling layer and a second filling layer, the first filling layer is wrapped outside the first sub-tube, the second sub-tube and the third sub-tube, the second filling layer is wrapped outside the first filling layer, the density of the first filling layer is less than the density of the second filling layer, and the core wire is arranged in the first filling layer.
[0008] Optionally, the core wire is arranged at the junction of the first sub-tube and the second sub-tube at the proximal end, and arranged at the middle position of the second sub-tube at the distal end.
[0009] Optionally, the first sub-tube has a first distal end, the second sub-tube has a second distal end, and the third sub-tube has a third distal end; the second distal end is arranged protruding from the first distal end and the third distal end; at least the second distal end is arranged curvedly as an arc.
[0010] Optionally, the second sub-tube is made of silica gel.
[0011] Optionally, the second distal end is arranged curvedly in an arc range of 90°-180°.
[0012] Optionally, the hardness of the first sub-tube, the second sub-tube and the third sub-tube gradually decreases.
[0013] Optionally, the second distal end is arranged curvedly towards the third sub-tube.
[0014] Optionally, the second sub-tube is provided with at least three drug delivery holes sequentially arranged along the axial direction thereof and close to the second distal end.
[0015] Optionally, the second sub-tube is provided with a first developing mark and a second developing mark at the distal end thereof, and the first developing mark is arranged closer to the second distal end than the second developing mark.
[0016] In the three-lumen microcatheter provided by the embodiment of the present application, the core wire provides sufficient support force and pushing force for the three sub-tubes, which helps to enhance the supportability and pushability of the three-lumen microcatheter, and avoids the three-lumen microcatheter from being bent during the pushing process.
[0017] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS
[0018] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application.
[0019] Figure 1 is a schematic diagram of the overall structure of a three-lumen microcatheter according to an embodiment of the present application; Figure 2 is a schematic diagram of the cross-sectional structure of a three-lumen microcatheter according to an embodiment of the present application Figure 1 Figure 3 is a schematic diagram of the cross-sectional structure of a three-lumen microcatheter according to an embodiment of the present application Figure 2 .
[0020] BRIEF DESCRIPTION OF DRAWINGS 1. Three-lumen microcatheter; 10. Core wire; 11. First sub-tube; 111. First distal tip; 12. Second sub-tube; 120. Drug delivery hole; 121. Second distal tip; 1201. First radiopaque marker; 1202. Second radiopaque marker; 13. Third sub-tube; 131. Third distal tip; 14. First filler layer; 15. Second filler layer; 16. Hub; 161. First hub lumen; 162. Second hub lumen. DETAILED DESCRIPTION
[0021] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements, numerical expressions, and numerical values of components and steps set forth in these embodiments are not limiting to the scope of the present application unless specifically stated otherwise.
[0022] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application or its application or uses.
[0023] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the specification, where appropriate.
[0024] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary, and not as a limitation. Thus, other examples of exemplary embodiments can have different values.
[0025] It should be noted that like reference numerals and letters refer to like items throughout the several views of the drawings, and that discussion of one item in a drawing does not preclude further discussion of that item in subsequent drawings.
[0026] SUMMARY Figures 1-3 As shown, according to one embodiment of the present application, a three-lumen microcatheter 1 is provided. The three-lumen microcatheter 1 includes a first sub-tube 11, a second sub-tube 12, and a third sub-tube 13; the first sub-tube 11, the second sub-tube 12, and the third sub-tube 13 are arranged side by side in order at a distal end; the length of the first sub-tube 11 and the length of the second sub-tube 12 are both greater than the length of the third sub-tube 13; the three-lumen microcatheter further includes a filler layer and a core wire 10, the filler layer wraps around the outside of the first sub-tube 11, the second sub-tube 12, and the third sub-tube 13, and the core wire 10 is arranged within the filler layer.
[0027] In the three-lumen microcatheter provided in this embodiment, three sub-tubes (first sub-tube 11, second sub-tube 12, and third sub-tube 13) are arranged side-by-side at the distal end. The lengths of the first and second sub-tubes 11 and 12 are both greater than the length of the third sub-tube 13. This structure provides a basic multi-lumen functional architecture for the three-lumen microcatheter, allowing different sub-tubes to be used for different purposes, such as delivering different drugs or placing different instruments. A filling layer surrounds the three sub-tubes, and a core wire 10 is disposed inside the filling layer. The filling layer protects and fixes the three sub-tubes, while the core wire 10 provides sufficient support and pushing force to the three sub-tubes, enhancing the support and pushing ability of the three-lumen microcatheter and preventing bending during delivery.
[0028] This three-lumen microcatheter has three independent chambers (the first chamber within the first daughter tube 11, the second chamber within the second daughter tube 12, and the third chamber within the third daughter tube 13), each with a specific function, such as drug infusion, contrast agent injection, or guidewire delivery. This design allows the three-lumen microcatheter to perform multiple procedures simultaneously, improving the efficiency and flexibility of surgery.
[0029] For example, the first chamber within the first daughter tube 11 and / or the second chamber within the second daughter tube 12 are used for guidewire insertion. The placement of the core wire 10 helps increase the maneuverability of the guidewire within the chambers, making it easier to adjust the tip shape and increase penetration. This, in turn, helps the guidewire pass through tortuous vessels or collateral circulations in CTO-PCI procedures, improving the success rate of the procedure.
[0030] Furthermore, the core wire 10 is generally made of metal. As a reinforcing component inside the three-lumen microcatheter, it can significantly increase the strength and pushing force of the three-lumen microcatheter; this makes it easier for the three-lumen microcatheter to pass through complex lesions, reducing the difficulty of operation and surgical risks.
[0031] Specifically, the core wire 10 can be made of one of the following materials: NIT (nickel-titanium alloy), stainless steel, tungsten, or reinforced stainless steel; the diameter of the core wire 10 can be 0.1mm to 0.3mm; the length of the core wire 10 can extend from the proximal end of the first sub-tube 11 and the second sub-tube 12 (away from the end of the third sub-tube 13) to 5cm to 15cm from the third sub-tube 13 (the total length of the third tube is approximately 20cm).
[0032] Reference Figures 2-3As shown, in one embodiment, the filling layer includes a first filling layer 14 and a second filling layer 15. The first filling layer 14 is disposed outside the first sub-tube 11, the second sub-tube 12 and the third sub-tube 13. The second filling layer 15 is disposed outside the first filling layer 14. The density of the first filling layer 14 is less than the density of the second filling layer 15. The core wire 10 is disposed inside the first filling layer 14.
[0033] In this specific example, the filling layer is divided into a first filling layer 14 and a second filling layer 15, with the density of the first filling layer 14 being lower than that of the second filling layer 15. The core filament 10 is disposed within the first filling layer 14. This layered structure allows for better distribution of material properties. The low-density first filling layer 14 is more flexible, facilitating the placement of the core filament 10 and providing a certain cushioning effect. The high-density second filling layer 15 provides better structural strength and protective performance, further optimizing the performance of the three-lumen microcatheter and helping to improve support and delivery.
[0034] Reference Figures 2-3 As shown, in one embodiment, at the proximal end, the core wire 10 is disposed at the junction of the first sub-tube 11 and the second sub-tube 12; at the distal end, the core wire 10 is disposed at the middle position of the second sub-tube 12.
[0035] In this specific example, because the third sub-tube 13 is shorter, only the first sub-tube 11 and the second sub-tube 12 exist at the proximal end, with the core wire 10 positioned at the junction of the first sub-tube 11 and the second sub-tube 12. At the distal end, the first sub-tube 11, the second sub-tube 12, and the third sub-tube 13 are all present, with the core wire 10 positioned at the middle of the second sub-tube 12. This ensures that the core wire 10 is positioned more centrally, providing better support.
[0036] Reference Figure 1 As shown, in one embodiment, the first sub-tube 11 has a first distal end 111, the second sub-tube 12 has a second distal end 121, and the third sub-tube 13 has a third distal end 131; the second distal end 121 protrudes from the first distal end 111 and the third distal end 131; at least the second distal end 121 is curved into an arc shape.
[0037] In this specific example, the second distal end 121 protrudes beyond the first distal end 111 and the third distal end 131, and at least the second distal end 121 is curved into an arc shape. This structure gives the second sub-tube 12 a unique shape at its distal end. The protruding design allows the second sub-tube 12 to more accurately reach the target position during surgery, while the curved arc design allows the second sub-tube 12 to better adapt to the shape of human tissue and reduce tissue damage.
[0038] In one embodiment, the second sub-tube 12 is made of silicone.
[0039] In this specific example, the second tube 12 is made of silicone. Silicone has good biocompatibility, which can reduce irritation and adverse reactions to human tissues and lower surgical risks. At the same time, silicone has a certain degree of flexibility and elasticity, which is beneficial for the bending and manipulation of the second tube 12 inside the body.
[0040] Reference Figure 1 As shown, in one embodiment, the curvature of the second distal end 121 is in the range of 90° to 180°.
[0041] In this specific example, the curvature of the second distal tip 121 is adjustable between 90° and 180°, meaning that the degree of curvature of the second distal tip 121 can be adaptively adjusted when it encounters the blood vessel wall. This adjustability allows the three-lumen microcatheter to flexibly adjust the curvature of the second distal tip 121 according to different surgical needs and human tissue conditions, in order to better adapt to various complex surgical environments and improve the precision and success rate of the surgery.
[0042] Specifically, the adjustable curvature of the second distal tip 121 significantly improves catheter placement rates in complex vascular anatomy conditions during clinical use. Traditional microcatheters rely on pre-shaping or guidewire-assisted passive navigation, which often leads to difficulties and long operation times when encountering acute-angle branches, tortuous vessels, or anatomical structures with multiple closely spaced branches. The adjustable curvature design of the second distal tip 121 of this three-lumen microcatheter allows the operator to adjust the catheter tip angle in real time, greatly enhancing the controllability of the procedure. Traditional interventional procedures often require multiple microcatheters with different shapes for backup, or repeated withdrawal of the catheter to reshape the tip; while the adjustable curvature microcatheter simplifies surgical preparation and procedures through its multi-purpose nature.
[0043] In one embodiment, the hardness of the first sub-tube 11, the second sub-tube 12, and the third sub-tube 13 gradually decreases.
[0044] In this specific example, the stiffness of the first sub-tube 11, the second sub-tube 12, and the third sub-tube 13 gradually decreases. This stiffness gradient design allows the three-lumen microcatheter to provide sufficient support while being more flexible at the distal end, reducing tissue damage. During insertion, the stiffer proximal end provides support and pushing force, while the softer distal end better conforms to the shape of human tissue, improving the catheter's passage through the body and the flexibility of manipulation.
[0045] Reference Figure 1 As shown, in one embodiment, the second distal end 121 is bent toward the third sub-tube 13.
[0046] In this specific example, because the third tube 13 is the most flexible, the second distal end 121 is bent towards the third tube 13. This enhances the catheter's compliance, making it more flexible during operation. The physician can more easily control the catheter's direction and position, especially when navigating narrow or curved anatomical structures, reducing operational difficulty and increasing the success rate of the surgery. Furthermore, it allows the catheter to better conform to the complex and irregular shapes within human tissue, more naturally conforming to the surrounding tissue when reaching the target site.
[0047] Reference Figure 1 As shown, in one embodiment, the second sub-tube 12 has at least three drug delivery holes 120 sequentially opened along its axial direction near the second distal end 121.
[0048] In this specific example, the second sub-tube 12 has at least three drug delivery holes 120 sequentially arranged along its axial direction near the second distal end 121. The multiple drug delivery holes 120 increase the infusion area and range, enabling more precise delivery of the drug to the target area. This ensures the drug reaches a certain concentration and distribution range within the target area, thereby enhancing the therapeutic effect. This localized high-concentration drug action can achieve the therapeutic goal more quickly and shorten the treatment time. Furthermore, this precise drug delivery is particularly important for situations requiring local treatment, such as tumor chemotherapy, local anesthesia, and thrombolysis via spraying. By controlling the infusion rate and location of the drug, the therapeutic effect can be maximized while reducing systemic side effects.
[0049] Reference Figure 1 As shown, in one embodiment, the second sub-tube 12 is provided with a first development mark 1201 and a second development mark 1202 at its distal end, wherein the first development mark 1201 is provided closer to the second distal end 121 than the second development mark 1202.
[0050] In this specific example, the second sub-tube 12 is provided with a first imaging mark 1201 and a second imaging mark 1202 distributed along the axial direction at its distal end; the first imaging mark 1201 and the second imaging mark 1202 can be clearly displayed under imaging equipment such as X-ray, which helps doctors to accurately determine the position and shape of the distal end of the second sub-tube 12 during the operation, thereby more precisely controlling the position and range of drug infusion, improving the accuracy and safety of the operation, and indirectly improving the drug infusion function and the overall surgical effect.
[0051] In addition, refer to Figure 1 As shown, the three-lumen microcatheter has a seat 16 at its proximal end. The seat 16 has a first seat cavity 161 and a second seat cavity 162. The first seat cavity 161 communicates with the first chamber, and the second seat cavity 162 communicates with the second chamber. The seat 16 facilitates rapid guidewire exchange.
[0052] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.
[0053] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.
Claims
1. A three-lumen microcatheter, characterized in that, The three-lumen microcatheter includes: First sub-tube (11), second sub-tube (12), and third sub-tube (13); at the distal end, the first sub-tube (11), the second sub-tube (12), and the third sub-tube (13) are arranged side by side in sequence; the length of the first sub-tube (11) and the length of the second sub-tube (12) are both greater than the length of the third sub-tube (13); A filler layer and a core wire (10) are provided, wherein the filler layer is wrapped around the outside of the first sub-tube (11), the second sub-tube (12) and the third sub-tube (13), and the core wire (10) is provided inside the filler layer.
2. The three-lumen microcatheter according to claim 1, characterized in that, The filling layer includes a first filling layer (14) and a second filling layer (15). The first filling layer (14) is wrapped around the outside of the first sub-tube (11), the second sub-tube (12) and the third sub-tube (13). The second filling layer (15) is wrapped around the outside of the first filling layer (14). The density of the first filling layer (14) is less than the density of the second filling layer (15). The core wire (10) is disposed inside the first filling layer (14).
3. The three-lumen microcatheter according to claim 2, characterized in that, At the proximal end, the core wire (10) is disposed at the junction of the first sub-tube (11) and the second sub-tube (12); at the distal end, the core wire (10) is disposed at the middle position of the second sub-tube (12).
4. The three-lumen microcatheter according to claim 1, characterized in that, The first sub-tube (11) has a first distal end (111), the second sub-tube (12) has a second distal end (121), and the third sub-tube (13) has a third distal end (131); the second distal end (121) protrudes from the first distal end (111) and the third distal end (131); at least the second distal end (121) is curved into an arc shape.
5. The three-lumen microcatheter according to claim 4, characterized in that, The second sub-tube (12) is made of silicone.
6. The three-lumen microcatheter according to claim 5, characterized in that, The second distal end (121) has a bending radius of 90° to 180°.
7. The three-lumen microcatheter according to claim 1, characterized in that, The hardness of the first sub-tube (11), the second sub-tube (12) and the third sub-tube (13) gradually decreases.
8. The three-lumen microcatheter according to claim 4, characterized in that, The second distal end (121) is bent toward the third sub-tube (13).
9. The three-lumen microcatheter according to claim 4, characterized in that, The second sub-tube (12) has at least three drug delivery holes (120) sequentially opened along its axial direction near the second distal end (121).
10. The three-lumen microcatheter according to claim 4, characterized in that, The second sub-tube (12) has a first development mark (1201) and a second development mark (1202) at its distal end, wherein the first development mark (1201) is located closer to the second distal end (121) than the second development mark (1202).