Superhard guide wire

Abstract

The utility model relates to medical instrument technical field, concretely is a kind of superhard guide wire, including mandrel, Tip head, first spring, second spring, first coating, second coating;The distal end of mandrel is provided with transition section and shaping section;Tip head is connected in the end of shaping section;First spring is sleeved on shaping section;Second spring is sleeved outside first spring, and one end extends to transition section, and second spring is provided with multiple connecting areas;The one coating is coated in second spring and the distal end of mandrel;Second coating is coated in Tip head and first coating outside, and extends to the distal end of mandrel.This embodiment's superhard guide wire, multiple connecting areas are provided on second spring, and the flexibility of multiple connecting areas can improve second spring, so that it can have better anti-unraveling capacity, to avoid stress concentration on first coating and second coating when mandrel is used, reduce the risk that coating is pulled apart and falls off, improve the controllability and safety of guide wire in surgical process.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to an ultra-rigid guidewire. Background Technology

[0002] As the complexity of endovascular surgeries increases, surgeons demand higher levels of support, flexibility, and precision in guidewire manipulation. In diagnostic or interventional procedures within the aorta, ultra-rigid guidewires are used to assist in catheter placement and exchange. For example, during TAVI procedures, an ultra-rigid guidewire is inserted outside the apex of the left ventricle as a support guidewire, guiding the delivery of the large sheath (containing the valve) under its support, and then the valve is delivered to the designated position. In intrathoracic transplantation surgeries (such as the treatment of descending aortic aneurysms), ultra-rigid guidewires are used in conjunction with guiding catheters and sheaths to ensure precise delivery and stable operation of endovascular instruments.

[0003] Currently, it is difficult to balance flexibility and maneuverability in guidewires, making existing guidewires susceptible to damage during use, causing their surface coating to peel off, which in turn affects their maneuverability and safety during surgery.

[0004] In view of this, we propose an ultra-rigid guidewire. Utility Model Content

[0005] The purpose of this invention is to provide an ultra-rigid guidewire to solve the problems of ultra-rigid guidewires mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: An ultra-rigid guidewire includes a mandrel and further comprises: a tip, a first coiled spring, a second coiled spring, a first coating, and a second coating; the distal end of the mandrel is provided with a transition section and a shaping section; the tip is connected to the end of the shaping section; the first coiled spring is sleeved on the shaping section; the second coiled spring is sleeved outside the first coiled spring, one end of which extends to the transition section, and the second coiled spring is provided with multiple connecting areas; the first coating is applied to the second coiled spring and the distal end of the mandrel; the second coating is applied to the tip and the first coating, and extends to the distal end of the mandrel.

[0007] Preferably, the mandrel is coaxially arranged with the transition section and the shaping section.

[0008] Preferably, the outer diameter of the mandrel is 0.05-1.00 mm; the inner diameter of the first coiled spring is 0.1-0.8 mm and the outer diameter is 0.12-0.9 mm; the inner diameter of the second coiled spring is 0.15-0.9 mm and the outer diameter is 0.2-1.2 mm.

[0009] Preferably, the thickness of the first coating is 0.002 to 0.3 mm; and the thickness of the second coating is 0.001 to 0.3 mm.

[0010] Preferably, the length of the first coiled spring is less than the length of the second coiled spring; the length of the second coiled spring is less than the coating length of the first coating; and the coating length of the first coating is less than the coating length of the second coating.

[0011] Preferably, the tip is hemispherical or semi-ellipsoidal.

[0012] Compared with existing technologies, the beneficial effects of this invention are as follows: The ultra-rigid guidewire has a tip at the distal end of the mandrel, and the connection between the tip and the mandrel is configured as a transition section and a shaping section. By sleeved a first coiled spring on the shaping section, and a second coiled spring on top of the first coiled spring, the outer diameter of the guidewire tip is ensured to meet the requirements for intravascular delivery. Simultaneously, the flexibility and strength of the distal end of the mandrel are increased, ensuring its passage through blood vessels. Furthermore, the second coiled spring has multiple connecting sections, which enhance its flexibility and improve its resistance to unwinding. This prevents stress concentration on the first and second coatings during mandrel use, reducing the risk of coating tearing and detachment, and improving the guidewire's maneuverability and safety during surgery. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is the invention.

[0014] In the diagram: 1. Mandrel; 11. Transition section; 12. Shaping section; 2. Tip head; 3. First winding spring; 4. Second winding spring; 41. Multi-segment connection area; 5. First coating layer; 6. Second coating layer. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0017] 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "more" means two or more, unless otherwise explicitly specified.

[0018] Please see Figure 1 and Figure 2 As shown, this utility model provides a technical solution: A type of ultra-hard guidewire, mandrel 1, such as Figure 1 As shown, it also includes: a tip head 2, a first coiled spring 3, a second coiled spring 4, a first coating 5, and a second coating 6; the distal end of the mandrel 1 is provided with a transition section 11 and a shaping section 12; the tip head 2 is connected to the end of the shaping section 12; the first coiled spring 3 is sleeved on the shaping section 12; the second coiled spring 4 is sleeved outside the first coiled spring 3, with one end extending to the transition section 11, and the second coiled spring 4 is provided with multiple connecting areas 41; the multiple connecting areas 41 include, but are not limited to, connecting multiple coiled springs together to form the second coiled spring 4 by means of filler welding, laser welding, UV adhesive bonding, epoxy resin adhesive bonding, etc.; the first coating 5 is applied to the second coiled spring 4 and the distal end of the mandrel 1; the second coating 6 is applied to the tip head 2 and the first coating 5, and extends to the distal end of the mandrel 1.

[0019] Specifically, the distal end of the mandrel 1 (only its distal length is shown) is provided with a tip 2, and the connection between the tip 2 and the mandrel 1 is configured as a transition section 11 and a shaping section 12. By sleeved a first coiled spring 3 on the shaping section 12, and a second coiled spring 4 on the first coiled spring 3, it is ensured that the outer diameter of the guidewire end meets the requirements for intravascular delivery, and the flexibility and strength of the distal end of the mandrel 1 are increased, ensuring its passage through the blood vessel. At the same time, the second coiled spring 4 is provided with multiple connecting areas 41. The multiple connecting areas 41 can improve the flexibility of the second coiled spring 4, giving it better anti-unwinding ability, thereby avoiding stress concentration on the first coating 5 and the second coating 6 during the use of the mandrel 1, reducing the risk of the coating being torn and falling off, and improving the maneuverability and safety of the guidewire during the operation.

[0020] Preferred, such as Figure 2As shown, in this embodiment, the multi-segment connection area 41 provided on the second coiled spring 4 includes a first connection segment (left) and a second connection segment (right). The first connection segment is located in the middle of the second coiled spring 4, and the second connection segment is located at the connection position between the second coiled spring 4 and the transition segment 11. By providing multiple connection segments, the second coiled spring 4 has better anti-unwinding ability, thereby avoiding stress concentration on the first coating 5 and the second coating 6 when the mandrel 1 is used, and reducing the risk of the coating being torn and peeled off. In other embodiments, those skilled in the art can also provide more connection segments according to the length of the second coiled spring 4 to further improve the anti-unwinding ability of the second coiled spring 4.

[0021] Preferably, in other embodiments, the first coiled spring 3 may also be provided with multiple connecting areas to improve the anti-unwinding ability of the first coiled spring 3, thereby avoiding stress concentration on the first coating 5 and the second coating 6 when the mandrel 1 is used, and reducing the risk of the coating being torn and peeled off. The multi-connecting area setting method of the first coiled spring 3 can be the same as that of the second coiled spring 4.

[0022] In this embodiment, the mandrel 1 is coaxially arranged with the transition section 11 and the shaping section 12.

[0023] Specifically, the transition section 11 is frustum-shaped and the plastic section 12 is cylindrical, which makes the distal end of the mandrel 1 have a variable diameter setting, which facilitates the setting of the first coiled spring 3 and the second coiled spring 4, and ensures the strength of the mandrel 1 while making its outer diameter meet the requirements for delivery in blood vessels.

[0024] In this embodiment, the outer diameter of the spindle 1 is 0.05-1.00mm; the material includes, but is not limited to, stainless steel, nickel-titanium alloy, titanium alloy, etc.; the inner diameter of the first coiled spring 3 is 0.1-0.8mm, and the outer diameter is 0.12-0.9mm; the material includes, but is not limited to, stainless steel, gold, platinum, silver, nickel-titanium alloy and its alloy, etc. The inner diameter of the second coiled spring 4 is 0.15-0.9mm, and the outer diameter is 0.2-1.2mm; the width of a single coil of the second coiled spring 4 is greater than 0.1mm; the material includes, but is not limited to, stainless steel, nickel-titanium alloy, titanium alloy, tungsten steel, etc.

[0025] In this embodiment, the thickness of the first coating 5 is 0.002 to 0.3 mm, and the material includes, but is not limited to, PTFE, EPTFE, FEP, EFEP, Parylene, etc.; the thickness of the second coating 6 is 0.001 to 0.3 mm, and the material includes, but is not limited to, polyurethane, PVP, hydrogel, silicone oil, etc.

[0026] In this embodiment, the length of the first coiled spring 3 is less than the length of the second coiled spring 4; the length of the second coiled spring 4 is less than the coating length of the first coating layer 5; and the coating length of the first coating layer 5 is less than the coating length of the second coating layer 6.

[0027] Preferably, in this embodiment, the second coating 6 can coat the entire surface of the mandrel 1, thereby improving the protection of the surface of the mandrel 1.

[0028] In this embodiment, the Tip 2 is hemispherical or semi-ellipsoidal.

[0029] Preferably, in this embodiment, the tip head 2 is hemispherical. The hemispherical surface provides better passage for the distal end of the mandrel 1. In other embodiments, the tip head 2 can be set as a semi-ellipsoidal shape, which provides good passage for the distal end of the mandrel 1 while also providing support for the blood vessels.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A super-rigid guidewire, comprising a mandrel (1), characterized in that, Also includes: Tip head (2), first coiled spring (3), second coiled spring (4), first coating (5), second coating (6); The distal end of the mandrel (1) is provided with a transition section (11) and a shaping section (12). The tip (2) is connected to the end of the shaping section (12); The first coiled spring (3) is sleeved on the shaping section (12); The second coiled spring (4) is sleeved outside the first coiled spring (3), with one end extending to the transition section (11), and the second coiled spring (4) is provided with multiple connecting sections (41). The first coating (5) is applied to the distal ends of the second coiled spring (4) and the mandrel (1); The second coating (6) is applied to the outside of the tip head (2) and the first coating (5) and extends to the far end of the mandrel (1).

2. The ultra-rigid guidewire according to claim 1, characterized in that: The mandrel (1) is coaxial with the transition section (11) and the shaping section (12).

3. The ultra-rigid guidewire according to claim 1, characterized in that: The outer diameter of the mandrel (1) is 0.05-1.00 mm; The inner diameter of the first coiled spring (3) is 0.1-0.8 mm, and the outer diameter is 0.12-0.9 mm; The inner diameter of the second coiled spring (4) is 0.15-0.9 mm and the outer diameter is 0.2-1.2 mm.

4. The ultra-rigid guidewire according to claim 2, characterized in that: The thickness of the first coating (5) is 0.002 to 0.3 mm; The thickness of the second coating (6) is 0.001 to 0.3 mm.

5. The ultra-rigid guidewire according to claim 1, characterized in that: The length of the first coiled spring (3) is less than the length of the second coiled spring (4); the length of the second coiled spring (4) is less than the coating length of the first coating (5); the coating length of the first coating (5) is less than the coating length of the second coating (6).

6. The ultra-rigid guidewire according to claim 1, characterized in that: The tip (2) is hemispherical or semi-ellipsoidal.

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