Conical controllable guide wire for interventional operation

Abstract

The utility model provides a conical controllable guide wire for interventional operation, and relates to medical instruments, the guide wire comprises a rod body, a developing part and a lubricating coating, the diameter of the far end of the rod body is smaller than that of the near end, the diameter of the far end of the rod body does not exceed 0.02 inch, the rod body is of a hollow structure with the closed far end, a core wire is arranged in the rod body, and the developing part is arranged in the core wire. The developing part is arranged at the far end of the rod body, and the lubricating coating is arranged on the surface of the developing part and the surface of the far end of the rod body. The diameter of the guide wire is gradually reduced in the far-end direction, the guide wire can enter narrower blood vessels such as intracranial blood vessels and does not damage the blood vessels, the suction catheter can be directly guided to a blocked part, a micro guide wire does not need to be replaced for guiding, the windowsill effect caused by the fact that the guide wire is too thin is avoided, and the service life of the suction catheter is prolonged. Meanwhile, the problem that when the guide wire is too thick, the suction catheter needs to be pushed to the blocked part without guide of the guide wire is solved, the operation steps are simplified, the operation time is shortened, and the operation cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a tapered controllable guidewire for interventional surgery. Background Technology

[0002] Stroke has become the leading cause of death and disability among adults in my country, with acute ischemic stroke (AIS) accounting for approximately 70% of all strokes. In recent years, with the development of endovascular treatment techniques and materials, mechanical thrombectomy has become the standard treatment for patients with acute ischemic stroke complicated by large vessel occlusion. Stent thrombectomy and aspiration thrombectomy are the main methods of mechanical thrombectomy.

[0003] With improvements in aspiration catheter instruments, the efficiency of direct aspiration thrombectomy has become increasingly higher. Due to its rapid recanalization and low cost, direct aspiration thrombectomy has gradually become the preferred surgical option for AIS patients. During the procedure, the aspiration catheter is usually positioned using a guidewire (0.035-inch guidewire) to approach the intracranial segment of the artery. Because the tip of the 0.035-inch guidewire is relatively thick, it is usually not placed in the intracranial segment of the vessel to avoid vascular damage. For patients with good vascular conditions, the aspiration catheter can sometimes reach the occluded segment of the intracranial vessel for thrombectomy using a "naked" technique. However, when there is a "windowsill" effect or vascular tortuosity, microguidewires or microcatheters are usually used to guide the aspiration catheter to the occluded segment of the vessel. This not only increases the number of surgical steps and prolongs the operation time, but also increases the cost of the procedure due to the use of microguidewires and microcatheters. Therefore, it is necessary to design a guidewire for aspiration thrombectomy in AIS to solve these problems. Summary of the Invention

[0004] The purpose of this invention is to provide a tapered controllable guidewire for interventional surgery. This guidewire has the characteristics of a soft and malleable tip, so as to guide the aspiration catheter into the intracranial blood vessels for aspiration, and solve the problem that the existing mudfish guidewire cannot directly guide the aspiration catheter to the intracranial blood vessels.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A tapered controllable guidewire for interventional surgery, comprising:

[0007] The rod has a distal diameter smaller than the proximal diameter, and the distal diameter does not exceed 0.02 inches. The rod is a hollow structure with a closed distal end, and a core wire is provided inside the rod.

[0008] The developing section is located at the distal end of the rod body;

[0009] A lubricating coating is provided on the surface of the developing section and the distal surface of the rod.

[0010] Preferably, the lubricating coating is a hydrophilic coating.

[0011] Preferably, the diameter of the proximal end of the rod does not exceed 0.035 inches.

[0012] Preferably, the length of the rod is 120-160cm.

[0013] Preferably, the distal end surface of the rod is an outwardly convex curved surface.

[0014] Preferably, the developing part is a platinum-tungsten alloy developing spring, the developing part has a length of 2-3 cm, and the developing part surrounds the surface of the rod.

[0015] Preferably, the distal end of the rod is further provided with a developing coating, the developing coating is in contact with the rod, and the lubricating coating covers the surface of the developing coating.

[0016] Preferably, the distal end of the rod is provided with a forming part, the length of which is 1 to 3 cm.

[0017] Preferably, the diameter of the proximal end of the rod is 0.035 inches, and the diameter of the distal end of the rod is 0.02 inches.

[0018] Preferably, the distal end of the rod is hemispherical.

[0019] Beneficial effects:

[0020] (1) The diameter of the guidewire provided in this application gradually decreases towards the distal end. Compared with the existing loach guidewire, it can enter narrower blood vessels such as intracranial blood vessels without damaging the blood vessels. Thus, the aspiration catheter can be directly guided to the blockage site without removing the loach guidewire and replacing it with a micro guidewire for guidance. This can avoid the window effect caused by the guidewire being too thin and solve the problem that the aspiration catheter needs to be pushed to the blockage site without the guidewire when the loach guidewire is too thick. This simplifies the surgical procedure and helps to shorten the operation time and reduce the operation cost.

[0021] (2) A lubricating coating is provided at the distal end of the guidewire rod and the imaging part, and the distal end of the rod is curved, which can reduce the friction between the guidewire and the blood vessel wall, reduce the damage to the blood vessel wall caused by friction, and improve the passability of the guidewire, making it easier to pass through tortuous blood vessels.

[0022] (3) A shaping part is provided at the distal end of the rod body. The shaping part can be pre-bent as needed so that the guidewire can pass through blood vessels in specific locations such as the coronary artery when it is pushed. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. Wherein:

[0024] Figure 1 A front view of a tapered controllable guidewire for interventional surgery provided by this utility model.

[0025] Figure 2 This is a front view of the guide rod body in this utility model.

[0026] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0027] Figure 4 This is a front view of the near end of the guide rod body in this utility model.

[0028] Figure 5 This is a front view of the distal end of the guide rod body in this utility model.

[0029] Figure 6 This is a front view of a tapered controllable guidewire for interventional surgery provided in Example 2.

[0030] Figure 7 This is a schematic diagram of the developing coating at the distal end of the guide wire body in this utility model.

[0031] Figure 8 This is a structural diagram of the distal end of the lead screw in this utility model.

[0032] In the diagram: 100, rod body; 200, developing section; 300, core wire; 101, lubricating coating; 102, developing coating; 103, forming section. Detailed Implementation

[0033] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art are within the protection scope of this utility model.

[0034] 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.

[0035] 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.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" and "second" may explicitly or implicitly include one or more features.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection or a connection that can communicate with each other; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements, an indirect connection, or an interaction between two elements.

[0038] The present invention will now be described in detail with reference to the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0039] This invention addresses the problem that current guidewires cannot directly guide aspiration catheters into intracranial blood vessels. It provides a tapered, controllable guidewire for interventional surgery, including a shaft 100, as shown below. Figures 1-3 As shown, the diameter of the rod 100 gradually decreases towards the distal end, making the diameter of the distal end of the rod 100 smaller than that of the proximal end, and the diameter of the distal end of the rod 100 does not exceed 0.02 inches, so that the distal end of the rod 100 can enter narrower blood vessels. The rod 100 is a hollow structure with a closed distal end, and a core wire 300 is provided inside the rod 100. Figures 4-5 As shown, the proximal end of the core wire 300 passes through the inner cavity of the rod 100 and extends to the outside of the proximal outlet of the rod 100. Thus, the core wire 300 can control the rod 100 to twist and change direction, so as to guide the aspiration catheter and other treatment catheters to the target site.

[0040] like Figures 1-2 As shown, the distal end of the rod 100 is provided with a imaging section 200 so as to determine the position of the distal end of the rod 100 through the image, thereby determining whether the guide wire is in place.

[0041] like Figures 1-2As shown, a lubricating coating 101 is provided on the distal surface of the rod 100 to reduce friction between the rod 100 and tissues such as the blood vessel wall, thereby reducing the pushing resistance of the rod 100 and the damage to the blood vessel wall during pushing. It also reduces the friction between the rod 100 and the catheter, making the catheter travel more smoothly along the guidewire. In this invention, the coverage length of the lubricating coating 101 is greater than the length of the imaging section 200. In some embodiments, such as... Figure 6 As shown, a lubricating coating 101 can also be applied to the entire surface of the rod 100.

[0042] A lubricating coating 101 is also provided on the surface of the developing section 200 to reduce the friction at the developing section 200 at the guide wire tip.

[0043] In a preferred embodiment of this invention, the lubricating coating 101 is a hydrophilic coating, such as a semi-esterified methyl vinyl ether-maleic anhydride copolymer coating. When the hydrophilic coating comes into contact with water in the blood, it forms a gel material with an extremely low coefficient of friction, thereby significantly reducing the friction during the guidewire pushing process.

[0044] In a preferred embodiment of this utility model, the proximal diameter of the rod 100 does not exceed 0.035 inches, for example, 0.035 inches, 0.034 inches, 0.033 inches, 0.032 inches, 0.021 inches, or 0.030 inches.

[0045] In a preferred embodiment of this utility model, the length of the rod 100 is 120-160cm, for example 121cm, 125cm, 130cm, 135cm, 140cm, 145cm, 150cm, 155cm, or 159cm.

[0046] In a preferred embodiment of this utility model, the distal end surface of the rod 100 is an outwardly convex curved surface, such as a hemisphere or a semi-ellipsoid, to make the distal end of the rod 100 as smooth as possible, further reducing pushing resistance and damage to the blood vessel wall during pushing.

[0047] In a preferred embodiment of this utility model, the developing part 200 is a platinum-tungsten alloy developing spring that surrounds the surface of the rod 100. The length of the developing part 200 is 2 to 3 cm (e.g., 2 cm, 2.5 cm, 3 cm), and its diameter does not exceed 0.02 inches. More preferably, the developing part 200 can be installed by embedding it into the surface of the rod 100 to avoid the developing part 200 protruding from the surface of the rod 100 and affecting its passage performance.

[0048] In the preferred embodiment of this utility model, such as Figures 7-8As shown, the distal end of the rod 100 is also provided with a developing coating 102 to further improve the developing effect. The developing coating 102 is in contact with the rod 100, and the lubricating coating 101 covers the surface of the developing coating 102. That is, the distal surface of the rod 100 is a double coating, with the outer layer being the lubricating coating 101 and the inner layer being the developing coating 102.

[0049] The developing coating 102 uses a developing coating conventional in the art, such as tungsten resin.

[0050] In a preferred embodiment of this utility model, a forming part 103 is provided at the distal end of the rod 100. The length of the forming part 103 is 1 to 3 cm, for example, 1 cm, 1.5 cm, 2.0 cm, 2.5 cm, or 3.0 cm. The rod 100 of the forming part 103 has formability so that the forming part 103 can be pre-bent as needed.

[0051] In a preferred embodiment of this utility model, the diameter of the proximal end of the rod 100 is 0.035 inches, and the diameter of the distal end of the rod 100 is 0.02 inches, with the diameter decreasing uniformly from the proximal end to the distal end.

[0052] The present invention provides a detailed description of a tapered controllable guidewire for interventional surgery through specific embodiments.

[0053] Example 1

[0054] like Figures 1-5 As shown, this embodiment provides a tapered controllable guidewire for interventional surgery, including a rod 100. The diameter of the rod 100 is uniformly reduced towards the distal end, making the distal diameter of the rod 100 smaller than the proximal diameter. Specifically, the proximal diameter of the rod 100 is 0.035 inches, and the distal diameter is 0.02 inches, so that the proximal end of the rod 100 is thick enough to avoid the window sill effect, and the distal end of the rod 100 is thin enough to enter narrower blood vessels. The rod 100 is a hollow structure with a closed distal end. A core wire 300 is provided inside the rod 100. The proximal end of the core wire 300 passes through the inner cavity of the rod 100 and extends to the outside of the proximal outlet of the rod 100. Thus, the core wire 300 can control the rod 100 to twist and change direction, so as to guide the aspiration catheter or other treatment catheters to the target site.

[0055] The distal end of the rod 100 is provided with a developing section 200 so that the position of the distal end of the rod 100 can be determined by the image, thereby determining whether the guide wire is in place. Specifically, the developing section 200 is a platinum-tungsten alloy developing spring with a length of 3cm. The developing section 200 is wrapped around the surface of the rod 100 and can bend with the head end of the rod 100.

[0056] A lubricating coating 101 is provided on the distal surface of the rod 100 to reduce friction between the rod 100 and tissues such as the blood vessel wall, thereby reducing the pushing resistance of the rod 100 and the damage to the blood vessel wall during the pushing process. It can also reduce the friction between the rod 100 and the catheter, making the catheter travel more smoothly along the guidewire. Preferably, the lubricating coating 101 is a hydrophilic coating.

[0057] In this embodiment, the length of the rod 100 is 150cm, and the distal end of the rod 100 is hemispherical to make the distal end of the rod 100 as smooth as possible, further reducing pushing resistance and damage to the blood vessel wall during pushing.

[0058] like Figures 7-8 As shown, the distal end of the rod 100 is also provided with a developing coating 102, which is in contact with the rod 100. A lubricating coating 101 covers the surface of the developing coating 102, thereby improving the developing effect of the distal end of the guidewire without affecting the lubricity.

[0059] The far end of the rod 100 is provided with a forming part 103, the length of which is 2cm, so that the forming part 103 can be pre-bent as needed.

[0060] When the aspiration catheter reaches a location prone to the window sill effect, such as a vascular branch, along the guidewire, the diameter of the rod 100 at that location is greater than 0.02 inches, with a small difference from the inner diameter of the aspiration catheter. This allows the aspiration catheter to travel as close as possible along the axis of the guidewire rod 100, thus preventing the tip of the aspiration catheter from contacting the vascular branch and avoiding the window sill effect. Because the distal diameter of the rod 100 is close to 0.02 inches, it can reach intracranial vessels without causing damage, allowing the aspiration catheter to travel directly to the treatment site along the guidewire, avoiding the aspiration catheter being "naked" and improving the applicability of aspiration thrombectomy.

[0061] Example 2

[0062] This embodiment is an improvement on embodiment 1. Specifically, the difference from embodiment 1 is that the lubricating coating 101 covers the entire rod 100, further improving the lubricity of the guide wire and reducing the pushing resistance.

[0063] In summary:

[0064] This invention provides a tapered controllable guidewire for interventional surgery, which can enter narrower blood vessels such as intracranial vessels without damaging them. It can directly guide the aspiration catheter to the blockage site without replacing the microguidewire, avoiding the window effect caused by an excessively thin guidewire. It also solves the problem that the aspiration catheter needs to be pushed to the blockage site without guidewire guidance when the guidewire is too thick. This simplifies the surgical procedure, helps to shorten the operation time and reduce the operation cost, and is equipped with a lubricating coating 101 to reduce frictional resistance and facilitate push-in.

[0065] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tapered controllable guidewire for interventional surgery, characterized in that, include: The rod has a distal diameter smaller than the proximal diameter, and the distal diameter does not exceed 0.02 inches. The rod is a hollow structure with a closed distal end, and a core wire is provided inside the rod. The developing section is located at the distal end of the rod body; A lubricating coating is provided on the surface of the developing section and the distal surface of the rod.

2. The tapered controllable guidewire for interventional surgery according to claim 1, characterized in that, The lubricating coating is a hydrophilic coating.

3. The tapered controllable guidewire for interventional surgery according to claim 1, characterized in that, The diameter of the proximal end of the rod does not exceed 0.035 inches.

4. The tapered controllable guidewire for interventional surgery according to claim 1, characterized in that, The length of the rod is 120-160cm.

5. A tapered controllable guidewire for interventional surgery according to any one of claims 1 to 4, characterized in that, The distal end surface of the rod is an outwardly convex curved surface.

6. A tapered controllable guidewire for interventional surgery according to any one of claims 1 to 4, characterized in that, The developing section is a platinum-tungsten alloy developing spring, the length of which is 2-3 cm, and the developing section surrounds the surface of the rod.

7. A tapered controllable guidewire for interventional surgery according to any one of claims 1 to 4, characterized in that, The distal end of the rod is also provided with a developing coating, which is in contact with the rod, and the lubricating coating covers the surface of the developing coating.

8. A tapered controllable guidewire for interventional surgery according to any one of claims 1 to 4, characterized in that, The distal end of the rod is provided with a forming part, the length of which is 1 to 3 cm.

9. A tapered controllable guidewire for interventional surgery according to claim 3, characterized in that, The diameter of the proximal end of the rod is 0.035 inches, and the diameter of the distal end of the rod is 0.02 inches.

10. A tapered controllable guidewire for interventional surgery according to claim 5, characterized in that, The distal end of the rod is hemispherical.

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