Micro guide wire

Abstract

The utility model discloses a micro guide wire which comprises a guide pipe, the extension direction of the guide pipe serves as the first direction, a circulation channel penetrating in the first direction is formed in the guide pipe, a developing spring is arranged in the circulation channel, and the diameter of a pipe opening of the circulation channel in the first direction is smaller than that of the developing spring. The outer wall of the micro guide wire is smooth and complete, the moving smoothness of the guide wire in a blood vessel or other cavities is remarkably improved, friction resistance caused by surface unevenness or welding defects is reduced, meanwhile, the developing effect can be enhanced through the built-in developing spring, and DAS developing is clearer.

Description

Technical Field

[0001] This utility model relates to the field of medical supplies technology, and in particular to a microguidewire. Background Technology

[0002] A microguidewire is an interventional diagnostic and therapeutic device inserted into a microcatheter to provide guidance and support. Because nerves and blood vessels are very thin and intricately distributed, microguidewires need to possess good torsional control, flexibility, and support to ensure accurate lesion placement. Existing microguidewires utilize contrast-enhancing springs to improve contrast, but these springs are typically only wound around the outside of the microguidewire. This results in insufficient surface smoothness of the microguidewire, generating excessive friction and affecting the smoothness of the procedure. Utility Model Content

[0003] The purpose of this invention is to provide a microguidewire to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] The solution to the technical problem of this utility model is:

[0005] A microguidewire comprising:

[0006] The catheter, with the extension direction of the catheter as the first direction, has a flow channel formed inside the catheter that extends along the first direction, and a imaging spring is provided inside the flow channel. The diameter of the opening of the flow channel along the first direction is smaller than the diameter of the imaging spring.

[0007] This technical solution offers at least the following advantages: Compared to traditional guidewires with external imaging springs, the outer wall of this patented catheter is smooth and intact, significantly improving the smoothness of guidewire movement within blood vessels or other cavities and reducing frictional resistance caused by surface unevenness or welding defects. Simultaneously, the integrated catheter structure avoids the uneven imaging density problem caused by the microgroove structure of traditional hypotubes, resulting in more uniform and clear imaging from the imaging spring. This provides higher contrast and resolution imaging in DAS (digital subtraction angiography) images, improving the precision and safety of surgical procedures. Furthermore, this design reduces the risk of guidewire puncture or damage to blood vessels during use, further enhancing the clinical applicability and reliability of the guidewire.

[0008] As a further improvement to the above technical solution, the catheter includes a small-diameter segment and a large-diameter segment connected sequentially along a first direction, wherein the cross-sectional area of ​​the small-diameter segment gradually decreases along the first direction. This gradually decreasing small-diameter segment provides guidance during use, improving the smoothness of the microguidewire during operation.

[0009] As a further improvement to the above technical solution, the imaging spring is installed within the flow channel at the small-diameter section. The imaging spring, positioned at the end of the small-diameter section, enhances the support strength at that section, ensuring the microguidewire maintains its shape and function after entering the human body, thus meeting the requirements of delicate surgical procedures.

[0010] As a further improvement to the above technical solution, the diameter of the end of the flow channel in the small-diameter section, in the opposite direction to the first direction, is larger than the diameter of the developing spring, and the inner diameter of the flow channel in the large-diameter section is larger than the diameter of the developing spring. During assembly, the developing spring can be easily inserted into the guide tube from the appropriate end directly through the flow channel, greatly reducing assembly difficulty and improving production efficiency.

[0011] As a further improvement to the above technical solution, the flexibility of the small-diameter segment gradually increases along the first direction. By reducing the flexibility of the end of the small-diameter segment, the microguidewire as a whole can more easily conform to the curvature of the blood vessel, naturally deforming with the curvature of the blood vessel, while reducing the risk of puncture.

[0012] As a further improvement to the above technical solution, a hydrophilic coating is provided on the outer wall of the catheter. When the outer wall of the catheter has a hydrophilic coating, the coating will form a lubricating water film when it comes into contact with water. This water film can significantly reduce the friction between the microguidewire and the inner wall of the channel, making the microguidewire smoother during advancement. Doctors can use less force to deliver the microguidewire to the target position, reducing the difficulty and time of the operation.

[0013] As a further improvement to the above technical solution, an infusion connector is connected to one end of the catheter in the opposite direction to the first direction. The infusion connector contains an infusion channel that communicates with the circulation channel. Previously, removing the microguidewire and re-injecting the medication was cumbersome and time-consuming. Now, the medication is injected directly through the infusion connector, allowing for a continuous surgical process. Doctors can quickly respond to intraoperative situations, such as timely injection of thrombolytic drugs, seizing the golden treatment time. This also avoids the risks of vascular damage and infection that may be caused by repeated removal and insertion of the microguidewire, ensuring patient safety.

[0014] As a further improvement to the above technical solution, a guide groove is provided at one end of the infusion connector near the catheter. The guide groove is connected to the infusion channel, and the catheter is connected to the guide groove. The guide groove allows the catheter to be inserted into the infusion connector more easily, facilitating a quick connection between the infusion plug and the catheter.

[0015] As a further improvement to the above technical solution, the guide groove is conical. A conical guide surface is formed inside the guide groove, which facilitates the alignment and insertion of the catheter into the infusion connector.

[0016] As a further improvement to the above technical solution, the conduit is made of a nickel-titanium alloy, in which nickel accounts for 54.8% and titanium accounts for 45.2%. This appropriate alloy ratio allows for better flexibility after the forging process. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the microguidewire of this utility model;

[0019] Figure 2 yes Figure 1 Enlarged view of A in the middle;

[0020] Figure 3 This is a schematic diagram of the connection part after the microguidewire and the infusion connector of this utility model are connected. Attached Figure Description

[0022] 1. Tube; 11. Large diameter section; 12. Small diameter section; 2. Imaging spring; 3. Flow channel; 4. Infusion connector; 41. Infusion channel; 42. Guide groove. Detailed Implementation

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] Existing microwire structures are typically solid rods with external thiopanles or developing springs to enhance X-ray imaging. However, this structure has several problems. For example, external developing springs can lead to insufficient surface smoothness, unevenness of the outer wall, and excessive friction, affecting operational smoothness. When using traditional thiopanles, laser cutting of microgrooves is required to prevent bending of the microwire surface, resulting in blurred or artifact-like images in DAS images. To address these issues, this application provides a microwire with better movement smoothness and clearer imaging.

[0028] Reference Figure 1 and Figure 2 The microguidewire provided in this application includes a guide tube 1 and a radiopaque spring 2. The guide tube 1 is an integrally formed structure, and both ends of the guide tube 1 are spherical. The radiopaque spring 2 is placed inside the guide tube 1. With the extension direction of the guide tube 1 as the first direction, specifically, a flow channel 3 is opened inside the guide tube 1 and extends along the first direction. The radiopaque spring 2 is placed inside the flow channel 3. The diameter of the opening of the flow channel 3 along the first direction is smaller than the diameter of the radiopaque spring 2. In use, with the first direction as the direction of entry into the human body, the radiopaque spring 2 is limited by the smaller diameter opening, reducing the risk of the radiopaque spring 2 falling out of the guide tube 1.

[0029] As described above, compared to the traditional guidewire structure with an external contrast-enhancing spring 2, the catheter 1 of this application does not require microgrooving, and its outer wall is smooth and intact, significantly improving the smoothness of the microguidewire's movement within blood vessels or other cavities. Simultaneously, the integrated structure of the entire catheter 1 provides stronger coaxiality, with no welding points on the surface, effectively reducing frictional resistance caused by surface unevenness or welding defects. Furthermore, the integrated catheter 1 structure avoids the uneven contrast density problem caused by the microgrooving structure of traditional hypotubes, resulting in a more uniform and clear contrast effect from the contrast-enhancing spring 2. This provides higher contrast and resolution in DAS (digital subtraction angiography) images, improving the precision and safety of surgical procedures. In addition, this design reduces the risk of guidewire puncture or damage to blood vessels during use, further enhancing the clinical applicability and reliability of the guidewire.

[0030] The catheter 1 includes a large-diameter section 11 and a small-diameter section 12 connected sequentially along a first direction. A contrast-enhancing spring 2 is installed in the small-diameter section 12 and located within the connecting channel therein. The cross-sectional area of ​​the small-diameter section 12 gradually decreases along the first direction, and the diameter of the connecting channel at the small-diameter section 12 also gradually decreases along the first direction. Firstly, the gradually decreasing diameter of the small-diameter section 12 provides guidance during use, improving the smoothness of the microguidewire during use. Secondly, placing the contrast-enhancing spring 2 within the small-diameter section 12 increases the support strength at the small-diameter section 12, allowing the microguidewire to maintain good shape and function after entering the human body, meeting the requirements of delicate surgical operations. Moreover, installing the contrast-enhancing spring 2 at the gradually decreasing inner diameter of the small-diameter section 12 allows for fixation of the contrast-enhancing spring 2 through the gradually decreasing connecting channel, reducing the movement of the contrast-enhancing spring 2 within the connecting channel without the need for welding or other fixing methods, thereby improving the stability of contrast enhancement.

[0031] As a further implementation, when manufacturing the body of the catheter 1, it is stretched by a cold drawing process, which causes the outer diameter of the small diameter section 12 and the large diameter section 11 of the catheter 1 to change. The variable of the catheter 1 between different diameter sections is precisely controlled, so that the catheter 1 can stably form the small diameter section 12 for guidance.

[0032] The diameter of the end of the flow channel 3 in the small diameter section 12, in the opposite direction to the first direction, is larger than the diameter of the developing spring 2. The inner diameter of the flow channel 3 in the large diameter section 11 is larger than the diameter of the developing spring 2. This design allows the developing spring 2 to be directly inserted into the flow channel 3 of the guide wire 1 from the end of the large diameter section 11 to complete the assembly, reducing unnecessary solder joints and fixing structures.

[0033] The flexibility of the small diameter segment 12 gradually increases as it extends along the first direction. By reducing the flexibility of the end of the small diameter segment 12, the microguidewire as a whole is more likely to conform to the curvature of the blood vessel and naturally deform with the curvature of the blood vessel, while reducing the risk of puncture.

[0034] The conduit 1 is made of nickel-titanium alloy, specifically, nickel accounts for 54.8% and titanium accounts for 45.2% of the alloy. This appropriate alloy ratio allows for better flexibility after the forging process.

[0035] In this embodiment, the small-diameter segment 12 undergoes hardness changes through different heat treatment processes, while the large-diameter segment 11 requires no treatment. Specifically, the small-diameter segment 12 can be divided into a first heat treatment zone, a second heat treatment zone, a third heat treatment zone, and a fourth heat treatment zone arranged sequentially in the opposite direction of the first direction. The specific operations for each heat treatment zone are as follows:

[0036] The processes in the first heat treatment zone are as follows: solution treatment: 800-950℃, 30 minutes; tempering treatment: 500℃, 10-20 minutes; water cooling treatment.

[0037] The processes in the second heat treatment zone are as follows: solution treatment: 800-950℃, 30 minutes; tempering treatment: 500℃, 5-10 minutes; water cooling treatment.

[0038] The processes in the third heat treatment zone are as follows: solution treatment: 800-950℃, 30 minutes; tempering treatment: 300℃, 10-20 minutes; water cooling treatment.

[0039] The processes in the fourth heat treatment zone are as follows: solution treatment: 800-950℃, 30 minutes; tempering treatment: 300℃, 10-20 minutes; water cooling treatment.

[0040] The outer wall of catheter 1 is coated with a PVP hydrophilic coating. When the outer wall of catheter 1 has a hydrophilic coating, the coating will form a lubricating water film when it comes into contact with water. This water film can significantly reduce the friction between the microguidewire and the inner wall of the channel, making the microguidewire smoother during advancement. Doctors can use less force to deliver the microguidewire to the target position, reducing the difficulty and time of the operation.

[0041] Reference Figure 3 The catheter 1 is connected to an infusion connector 4 at one end in the opposite direction of the first direction. An infusion channel 41 is formed inside the infusion connector 4, which runs through the first direction. The infusion channel 41 is connected to the flow channel 3. Specifically, the infusion channel 41 has an opening at the end in the first direction. The cross-sectional area of ​​the opening is adapted to the diameter of the large diameter section 11. In use, the connection between the infusion connector 4 and the catheter 1 can be completed by directly inserting the catheter 1 into the channel of the infusion connector 4.

[0042] As can be seen from the above, in the past, removing the microguidewire and re-injecting the medication was a cumbersome and time-consuming procedure. Now, the medication is injected directly through the infusion connector 4, allowing the surgical process to continue. Doctors can quickly respond to intraoperative situations, such as timely injection of thrombolytic drugs, seizing the golden time for treatment. At the same time, it avoids the risks of vascular damage and infection that may be caused by repeated removal and insertion of the microguidewire, thus ensuring patient safety.

[0043] The infusion connector 4 has a guide groove 42 at one end near the catheter 1. The guide groove 42 and the infusion channel 41 are connected through an opening. The catheter 1 is connected to the guide groove 42. The guide groove 42 allows the catheter 1 to be inserted into the infusion connector 4 more accurately, which facilitates the quick connection of the catheter 1 of the infusion connector 4.

[0044] The guide groove 42 is conical, with the tip of the cone located at the opening. The guide groove 42 forms an inclined guide surface, allowing the catheter 1 to be quickly connected to the infusion connector 4 after falling into the guide groove 42.

[0045] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A microguidewire, characterized in that, include: The conduit (1) has a first direction of extension of the conduit (1), and a flow channel (3) is formed inside the conduit (1) that extends along the first direction. A developing spring (2) is provided inside the flow channel (3), and the diameter of the opening of the flow channel (3) along the first direction is smaller than the diameter of the developing spring (2).

2. The microguidewire according to claim 1, characterized in that, The conduit (1) includes a small-diameter section (12) and a large-diameter section (11) connected sequentially along a first direction, wherein the cross-sectional area of ​​the small-diameter section (12) gradually decreases along the first direction.

3. A microguidewire according to claim 2, characterized in that, The developing spring (2) is installed in the flow channel (3) at the small diameter section (12).

4. A microguidewire according to claim 3, characterized in that, The diameter of the end of the flow channel (3) in the small diameter section (12) in the opposite direction of the first direction is greater than the diameter of the developing spring (2), and the inner diameter of the flow channel (3) in the large diameter section (11) is greater than the diameter of the developing spring (2).

5. A microguidewire according to claim 2, characterized in that, The softness of the small diameter segment (12) gradually increases along the first direction.

6. A microguidewire according to claim 1, characterized in that, A hydrophilic coating is provided on the outer wall of the conduit (1).

7. A microguidewire according to claim 1, characterized in that, The catheter (1) is connected to an infusion connector (4) at one end in the opposite direction of the first direction. An infusion channel (41) is provided inside the infusion connector (4), and the infusion channel (41) is connected to the flow channel (3).

8. A microguidewire according to claim 7, characterized in that, The infusion connector (4) is provided with a guide groove (42) at one end near the catheter (1), the guide groove (42) is connected to the infusion channel (41), and the catheter (1) is connected to the guide groove (42).

9. A microguidewire according to claim 8, characterized in that, The guide groove (42) is conical.

10. A microguidewire according to claim 1, characterized in that, The conduit (1) is made of nickel-titanium alloy, in which nickel accounts for 54.8% and titanium accounts for 45.2%.

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