Marker wire

Abstract

This application relates to the field of medical devices and discloses a marking guidewire, including a core wire, multiple contrast rings, and a spring. The core wire includes a main body segment, a first transition segment, a contrasting segment, a second transition segment, a thinning segment, and a protrusion; the main body segment, the first transition segment, the contrasting segment, the second transition segment, the thinning segment, and the protrusion are sequentially connected from the proximal end to the distal end of the core wire. Multiple contrast rings are disposed in the contrasting segment and are evenly spaced within the contrasting segment. The spring surrounds the periphery of the core wire and encloses the multiple contrasting rings. The marking guidewire of this application can be used to measure the length of lesion areas and the diameter of blood vessels, improving measurement efficiency and the convenience of subsequent operations.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of interventional medical devices, in particular to a marking guide wire. BACKGROUND

[0002] In the field of interventional medical devices, a guide wire is one of the important tools for establishing a vascular access. In order to smoothly enter the target blood vessel, a visualization is usually provided at the distal end of the guide wire so that the physician can clearly observe the guide wire head under DSA. However, the visualization at the distal end of the guide wire usually only has an indication function and does not usually have a measurement function.

[0003] In an interventional operation, it is often necessary to measure the length of a lesion area and the diameter of a blood vessel in order to facilitate subsequent treatment of the lesion area. At present, a marking catheter is usually used for measurement. However, due to the length of the catheter, the marking catheter cannot well complete this function for some lesion areas. SUMMARY

[0004] The purpose of the present application is to provide a marking guide wire which aims to measure a lesion area by using the marking guide wire.

[0005] To achieve the above purpose, the present application provides a marking guide wire, comprising:

[0006] a core wire, the core wire comprising a main body section, a first transition section, a visualization section, a second transition section, a thinning section, and a protruding portion; the main body section, the first transition section, the visualization section, the second transition section, the thinning section, and the protruding portion are sequentially connected from the proximal end to the distal end of the core wire;

[0007] a plurality of visualization rings, the plurality of visualization rings being arranged on the visualization section, and the plurality of visualization rings being uniformly spaced in the visualization section;

[0008] a spring, the spring being arranged around the side of the core wire and surrounding the plurality of visualization rings.

[0009] In some embodiments of the present application, the diameter of the first transition section gradually decreases from the proximal end to the distal end, the diameter of the second transition section gradually decreases from the proximal end to the distal end, and the diameter of the protruding portion is greater than the diameter of the thinning section.

[0010] In some embodiments of the present application, the visualization section is provided with a plurality of annular grooves which are uniformly spaced, and the plurality of visualization rings are arranged one-to-one corresponding to the plurality of annular grooves.

[0011] In some embodiments of the present application, a cladding portion is further included, the cladding portion being arranged around the visualization section and cladding the plurality of visualization rings, and after the spring is arranged around the cladding portion, the diameter of the marking guide wire on the main body section is the same as the diameter of the marking guide wire on the visualization section.

[0012] In some embodiments of the present application, the spring comprises a first spring portion and a second spring portion, which are sequentially arranged along the proximal end to the distal end of the core wire, the distal end of the first spring portion and the core wire distal end are welded and fixed, the proximal end of the first spring portion and the core wire proximal end are welded and fixed, the distal end of the second spring portion and the core wire distal end are welded and fixed, and the proximal end of the second spring portion and the core wire on the distal side of the first spring portion are welded and fixed.

[0013] In some embodiments of the present application, the first spring portion and the second spring portion are spaced apart, and the marker guide wire further comprises a welding section arranged between the first spring portion and the second spring portion.

[0014] Alternatively, the marker guide wire further comprises a fixed tube arranged between the first spring portion and the second spring portion, the proximal end of the fixed tube and the distal end of the first spring portion are welded and connected, and the distal end of the fixed tube and the proximal end of the second spring portion are welded and connected.

[0015] In some embodiments of the present application, the distance between the welding section or the fixed tube and the distal end of the marker guide wire ranges from 200mm to 220mm, and the length of the welding section or the fixed tube in the axial direction ranges from 1mm to 3mm.

[0016] In some embodiments of the present application, a traction wire and a bending handle are further included, the bending handle is detachably linked to the proximal end of the core wire, the proximal end of the traction wire is connected to the bending handle, a steering assembly is arranged in the core wire, the steering assembly comprises at least one guide wheel arranged radially along the guide wire, the distal end of the traction wire passes around the guide wheel and is fixedly connected to the distal end of the thinning section.

[0017] In some embodiments of the present application, a protection tube and a heat shrinkable film are further included, the protection tube is arranged at the proximal end of the core wire, the heat shrinkable film is wrapped around the proximal end of the core wire and the protection tube, and the traction wire passes out of the proximal end of the core wire and is arranged in the protection tube.

[0018] In some embodiments of the present application, a developing sheath is further included, which is arranged along the axial direction of the thinning section between the thinning section and the spring, the distal end of the traction wire passes through the developing sheath and is fixedly connected to the distal end of the core wire.

[0019] The marker guide wire provided by the application can be extended into a blood vessel to establish a blood vessel access. Since the multiple developing rings are equidistantly arranged on the developing section, when the developing section is placed in a lesion area, the length and the diameter of the lesion area can be measured through the multiple developing rings of the developing section. Compared with the measurement method through the marker catheter, the application can save the operation steps of penetrating the marker catheter, improve the measurement efficiency and the convenience of subsequent operation, and meanwhile, the developing section can be arranged with sufficient length according to the measurement requirement, so as to effectively measure the lesion areas with different lengths. Moreover, the developing rings are used as the measurement markers, which can ensure the consistency of the size, shape and relative distance between the markers, so as to improve the measurement accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in the drawings without creative labor.

[0021] Figure 1 is one of the structural schematic diagrams of the marker guide wire provided by the embodiments of the application;

[0022] Figure 2 is the structural schematic diagram of the core wire provided by the embodiments of the application;

[0023] Figure 3 is the second structural schematic diagram of the marker guide wire provided by the embodiments of the application;

[0024] Figure 4 is one of the bending structure schematic diagrams of the marker guide wire provided by the embodiments of the application;

[0025] Figure 5 is the internal structural schematic diagram of the core wire provided by the embodiments of the application;

[0026] Figure 6 is the second bending structure schematic diagram of the marker guide wire provided by the embodiments of the application;

[0027] Figure 7 is the third bending structure schematic diagram of the marker guide wire provided by the embodiments of the application;

[0028] Figure 8 is the fourth bending structure schematic diagram of the marker guide wire provided by the embodiments of the application;

[0029] Figure 9 is the proximal end structural schematic diagram of the marker guide wire provided by the embodiments of the application.

[0030] Explanation of icon numbers:

[0031] 100: Marking the guidewire;

[0032] 10: Core wire; 11: Main body section; 12: First transition section; 13: Development section; 14: Second transition section; 15: Refining section; 151: Protrusion;

[0033] 16: Steering assembly; 161: Guide wheel; 171: Cavity; 172: First bending thread channel; 18: Connecting thread;

[0034] 20: Development ring;

[0035] 30: Covering part;

[0036] 40: Spring; 41: First spring section; 42: Second spring section;

[0037] 51: Welding section; 52: Fixing pipe;

[0038] 60: Traction wire;

[0039] 70: Retaining ring;

[0040] 81: Developing sleeve; 82: Protective tube; 83: Heat shrink film;

[0041] 90: Bending handle; 91: Bending knob. Detailed Implementation

[0042] Exemplary embodiments of this application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this application and to fully convey the scope of this application to those skilled in the art.

[0043] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0044] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0045] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0046] To more clearly describe the structure of this application, the terms "proximal" and "distal" are used herein as conventional terms in the field of interventional medicine. Specifically, "distal" refers to the end furthest from the operator during the surgical procedure, "proximal" refers to the end closest to the operator during the surgical procedure, "axial" refers to its length direction, and "radial" refers to the direction perpendicular to the "axial".

[0047] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0048] like Figure 1 As shown, the marking guide wire 100 provided in this embodiment includes a core wire 10, a plurality of imaging rings 20, and a spring 40.

[0049] The core wire 10 includes a main body segment 11, a first transition segment 12, a developing segment 13, a second transition segment 14, and a thinning segment 15; the main body segment 11, the first transition segment 12, the developing segment 13, the second transition segment 14, and the thinning segment 15 are sequentially connected from the proximal end to the distal end of the core wire 10. A plurality of developing rings 20 are disposed on the developing segment 13, and the plurality of developing rings 20 are evenly spaced along the proximal end to the distal end of the developing segment 13. A spring 40 surrounds the periphery of the core wire 10 and encloses the plurality of developing rings 20.

[0050] It is important to understand that, because the main body segment 11 and the developing segment 13 have different diameters, the first transition segment 12 is used to transition from the main body segment 11 to the developing segment 13. That is, the diameter of the first transition segment 12 gradually decreases from the proximal end to the distal end, and the diameter of the developing segment 13 is smaller than the diameter of the main body segment 11. Similarly, since the developing segment 13 and the thinning segment 15 have different diameters, the second transition segment 14 is used to transition from the developing segment 13 to the thinning segment 15. That is, the diameter of the second transition segment 14 gradually decreases from the proximal end to the distal end, and the diameter of the thinning segment 15 is smaller than the diameter of the second transition segment 14.

[0051] In this embodiment, when measuring the length of the lesion region, the marker guidewire 100 can be inserted into the lesion region, and the imaging segment 13 can be placed in the lesion region. Under DSA, multiple imaging rings 20 of the imaging segment 13 can be clearly observed. The length of the lesion region is determined by observing the number of imaging rings 20 in the lesion region. For example, if the number of imaging rings 20 in the lesion region is n, then the length of the lesion region is (n-1)L, where L is the distance between the centers of adjacent imaging rings 20.

[0052] In this embodiment, when measuring the diameter of a blood vessel, the marker guidewire 100 can be inserted into the blood vessel, and the imaging segment 13 can be placed at the location where the diameter needs to be measured. Under DSA, the imaging ring 20 of the imaging segment 13 can be clearly observed. Since the diameter of the imaging ring 20 is fixed, the diameter of the blood vessel is determined by observing the ratio of the imaging ring 20 to the blood vessel at the lesion area. When measuring the diameter of a bifurcation vessel, it is only necessary to push the marker guidewire 100 to the bifurcation point within the main blood vessel, align the imaging segment 13 with the bifurcation point between the bifurcation and the main blood vessel, and determine the diameter of the bifurcation vessel by measuring the length of the imaging segment 13.

[0053] It is important to understand that if multiple gold-plated markers are used, the plating layer cannot be made very thick due to limitations in the gold plating process. Under DSA, the developing effect is difficult to distinguish from the guidewire itself, and the shape, size, and relative distance between each pair of gold-plated markers cannot be precisely controlled. This application uses a developing ring 20 as the marker. Under DSA, the marker guidewire 100 and the developing ring 20 can be clearly distinguished, and the shape and size of the developing ring 20 can be precisely controlled, as can the relative distance between each pair of developing rings 20.

[0054] The marker guidewire 100 of this embodiment can be inserted into a blood vessel to establish vascular access. Since multiple contrast rings 20 are equidistantly arranged on the contrast segment 13, when the contrast segment 13 is placed in the lesion area, the length of the lesion area can be measured by the number of contrast segments 13, and the diameter of the blood vessel can be measured by the size of the contrast rings 20 themselves. Compared to measurement using a marker catheter, this application reduces the steps of inserting a marker catheter, improves measurement efficiency and the convenience of subsequent operations. Furthermore, the contrast segment 13 can be set to a sufficient length according to measurement needs to effectively measure lesion areas of different lengths. Moreover, using contrast rings 20 as measurement markers ensures consistency in the size, shape, and relative distance between marker points, thereby improving measurement accuracy.

[0055] In this embodiment, the spacing between adjacent developing rings 20 is 10 mm, and the length of developing segment 13 is 100 mm. In other embodiments of the present invention, the spacing between adjacent developing rings 20 can also be 5 mm, 15 mm, 20 mm, etc., and the length of developing segment 13 can also be 150 mm, 200 mm, etc.

[0056] In this embodiment, the distance from the distal end of the core wire 10 to the first developing ring 20 at the distal end of the developing section 13 can be 100mm, 150mm, or 200mm. This ensures the passability and flexibility of the thinning section 15. Preferably, the distance from the distal end of the core wire 10 to the first developing ring 20 at the distal end of the developing section 13 is 100mm.

[0057] like Figure 2 As shown, in some embodiments, the developing section 13 is provided with a plurality of evenly spaced annular grooves (not shown), and a plurality of developing rings 20 are respectively provided in a one-to-one correspondence with the plurality of annular grooves, with the developing rings 20 fitted into the annular grooves. The annular grooves are structures used to position and fix the plurality of developing rings 20. Through the provided annular grooves, on the one hand, the developing rings 20 can be securely installed in the developing section 13, and on the other hand, it can also ensure that the plurality of developing rings 20 installed are equidistantly arranged, thereby ensuring the consistency of the relative distance between the marking points.

[0058] For example, when installing the developing ring 20 into the annular groove, the developing ring 20 can be placed in the annular groove, and then the developing ring 20 can be fixed by pre-pressing it so that it is embedded in the annular groove. This fixing method can ensure that the shape and size of the developing ring 20 fixed in the annular groove are consistent.

[0059] For example, the developing ring 20 is flush with the surface of the developing section 13. In this way, the outer peripheral surface of the developing section 13 is flush, which is conducive to the passage of the spring 40 and prevents the protruding developing ring 20 from bulging after being protected by the spring 40, thus preventing the developing spring 40 from loosening.

[0060] like Figure 1 and Figure 2 As shown, in some embodiments, the marker guide wire 100 further includes a covering portion 30, which surrounds the developing section 13 and covers a plurality of developing rings 20, with a spring 40 surrounding the covering portion 30. The covering portion 30 can further fix the plurality of developing rings 20. Furthermore, after covering the plurality of developing rings 20, the outer peripheral surface of the developing section 13 is smooth, which facilitates the insertion of the spring 40 and prevents the protruding developing rings 20 from bulging after being protected by the spring 40, thus preventing the developing spring 40 from loosening.

[0061] For example, after the spring 40 is surrounding the covering portion 30, the diameter of the marking guidewire 100 on the main body segment 11 is the same as the diameter of the marking guidewire 100 on the imaging segment 13 (covering portion 30). This ensures that the outer diameter of the main body segment 11 of the core wire 10 is consistent with that of the imaging segment 13, preventing the imaging ring 20 from protruding from the imaging segment 13. This prevents the spring 40 from being obstructed by the imaging ring 20 when passing through the imaging segment 13, thus avoiding difficulty in passing the spring 40. Furthermore, after the spring 40 covers the core wire 10, the surface of the spring 40 is smooth, which facilitates the insertion of the marking guidewire 100 into the blood vessel.

[0062] like Figure 1 and Figure 2 As shown, in some embodiments, the distal end of the thinned segment 15 is provided with a protrusion 151. It should be noted that the distal end of the marking guidewire 100 needs to be welded with a ball head to facilitate its fixed connection with the spring 40 and to prevent the distal end of the marking guidewire 100 from scratching blood vessels. In this embodiment, the diameter of the protrusion 151 is larger than the diameter of the thinned segment 15. By providing the protrusion 151 at the distal end of the thinned segment 15, it is convenient to weld a ball head to the distal end of the marking guidewire 100, and it also improves the structural strength after welding. Specifically, when welding the ball head, a laser is applied to the protrusion 151 to melt it, thus welding it to the distal end of the spring 40 to form the ball head. In this embodiment, the protrusion 151 can be made as short as possible to ensure the passability and flexibility of the thinned segment 15.

[0063] For example, the outer diameter of the protrusion 151 is the same as that of the main body segment 11. This allows the spring 40 to cover the protrusion 151, which is beneficial for welding a ball head to the distal end of the guide wire 100.

[0064] For example, the diameter of the distal end of the thinning segment 15 gradually increases to be the same as that of the main segment 11, and then extends along the direction from the proximal end to the distal end of the core wire 10 to form a protrusion 151.

[0065] like Figure 1 As shown, in some embodiments, the spring 40 includes a first spring portion 41 and a second spring portion 42, which are sequentially arranged along the proximal to distal end of the core wire 10. The stiffness of the second spring portion 42 is less than that of the first spring portion 41. The first spring portion 41 can provide better support and maneuverability, thus effectively supporting the marking guide wire 100 and facilitating manipulation. The second spring portion 42 can provide better plasticity and throughput, thus enabling the distal end of the marking guide wire 100 to have better plasticity, throughput, and flexibility, facilitating bending of the distal end of the marking guide wire 100 with less force required for bending.

[0066] For example, such as Figure 1 As shown, the first spring portion 41 is a rectangular spring, and the second spring portion 42 is a round wire spring. In other examples, such as Figure 4 As shown, the spring gap of the second spring part 42 is greater than the spring gap of the first spring part 41.

[0067] For example, the surface of the first spring portion 41 is coated with a PTFE hydrophobic coating. This allows the proximal end of the marker guidewire 100 to remain dry and prevents adhesion to blood or other bodily fluids. Therefore, the marker guidewire 100 can reduce thrombus formation when passing through blood vessels, thus lowering surgical risks. It also reduces friction between the marker guidewire 100 and the inner wall of the blood vessel, making the advancement of the marker guidewire 100 smoother.

[0068] For example, the surface of the second spring portion 42 is coated with a hydrophilic coating. When the distal end of the marker guidewire 100 comes into contact with blood or other bodily fluids, it can quickly absorb moisture to form a lubricating film. This lubrication helps to reduce the friction of the distal end of the marker guidewire 100 in the blood vessel, thereby giving the marker guidewire 100 better passage.

[0069] like Figure 1As shown, in some embodiments, the spring 40 includes a first spring portion 41 and a second spring portion 42, which are sequentially arranged from the proximal end to the distal end of the core wire 10. The distal end of the first spring portion 41 is welded to the distal side of the core wire 10, the proximal end of the first spring portion 41 is welded to the proximal end of the core wire 10, the distal end of the second spring portion 42 is welded to the distal end of the core wire 10, and the proximal end of the second spring portion 42 is welded to the core wire 10 located on the distal side of the first spring portion. It should be noted that if the spring 40 is a single continuous section, during guidewire advancement, due to the gap between the spring 40 and the core wire 10, the spring 40 will move distally and accumulate at the distal end when the guidewire 100 is advanced into the body. Furthermore, the spring 40 itself will wobble, thus affecting the guidewire's passability and making it more difficult for the guidewire to enter the blood vessel. In this embodiment, the spring 40 is configured as a first spring part 41 and a second spring part 42. When pushing the marker guidewire 100, the first spring part 41 is mainly pushed. The first spring part 41 and the second spring part 42 are segmented. The movement of the first spring part 41 will not affect the second spring part 42. The second spring part 42 can be stably placed at the distal end of the marker guidewire 100, thus ensuring better passability at the distal end of the marker guidewire 100, so that the marker guidewire 100 can smoothly enter the blood vessel.

[0070] For example, after the second spring portion 42 is fixed to the core wire 10, the length of the second spring portion 42 in the direction from the distal end to the proximal end ranges from 200mm to 220mm, preferably 210mm. In this way, the length of the second spring portion 42 is not too long, avoiding it from shaking or loosening, thus ensuring that the distal end of the marking guide wire 100 has better passability.

[0071] For example, after the second spring portion 42 is fixed to the distal end of the core wire 10, the proximal end of the second spring portion 42 extends over the developing section 13 and covers the entire developing section 13, and the second spring portion 42 does not extend into the main body section 11. In this way, the length of the second spring portion 42 is appropriate, preventing it from shaking or loosening, thus ensuring that the distal end of the marking guide wire 100 has better passability.

[0072] like Figure 1As shown, in some embodiments, the first spring portion 41 and the second spring portion 42 are spaced apart, and the guide wire 100 further includes a welding section 51 disposed between the first spring portion 41 and the second spring portion 42. By spaced apart, the first spring portion 41 and the second spring portion 42 are clearly segmented, preventing the movement of the first spring portion 41 from affecting the second spring portion 42. Furthermore, the portion of the first spring portion 41 and the second spring portion 42 that is laser-welded is also located between the first spring portion 41 and the second spring portion 42. This spaced arrangement also facilitates laser welding. It should be noted that the welding section 51 is formed by soldering the core wire 10 on the surface located between the first spring portion 41 and the second spring portion 42. Soldering sections 51 are applied to the first spring section 41 and the second spring section 42 to support and separate them. At the same time, since the core wire 10 is located between the first spring section 41 and the second spring section 42 without any other structure covering it, filling the soldering section 51 there can also ensure the consistency of the appearance of the marking guide wire 100.

[0073] For example, the surface of the solder section 51 is consistent with the surfaces of the first spring portion 41 and the second spring portion 42. This ensures a consistent appearance of the marking guide wire 100, without any noticeable protrusions or depressions. Specifically, after soldering between the first spring portion 41 and the second spring portion 42, the outer surface of the solder section 51 is polished to make its surface consistent with the surfaces of the first spring portion 41 and the second spring portion 42.

[0074] like Figure 3 As shown, in some embodiments, the first spring portion 41 and the second spring portion 42 are spaced apart. The marking guide wire 100 also includes a fixing tube 52, which is disposed between the first spring portion 41 and the second spring portion 42. The distal end of the fixing tube 52 is welded to the proximal end of the second spring portion 42, and the proximal end of the fixing tube 52 is welded to the distal end of the first spring portion 41. The fixing tube 52 provided in the first spring portion 41 and the second spring portion 42 can support and separate the first spring portion 41 and the second spring portion 42. Simultaneously, since the core wire 10 is located between the first spring portion 41 and the second spring portion 42 without any other structural covering, the consistent appearance of the marking guide wire 100 can also be ensured by providing the fixing tube 52 at this location.

[0075] For example, the surface of the fixing tube 52 is consistent with the surfaces of the first spring portion 41 and the second spring portion 42. This ensures a consistent appearance of the marking guide wire 100, without any noticeable protrusions or depressions.

[0076] like Figure 4As shown, in some embodiments, the first spring portion 41 and the second spring portion 42 can be two parts of the same spring 40. The spring 40 can be segmented by welding the gap between the first spring portion 41 and the second spring portion 42 together with the core wire 10. That is, the gap between the distal end of the first spring portion 41 and the proximal end of the second spring portion 42 is welded together with the core wire 10. The movement of the second spring portion 42 will not affect the first spring portion 41, and the first spring portion 41 can be stably positioned at the distal end of the marking guidewire 100, thus ensuring better passability of the distal end of the marking guidewire 100, allowing the marking guidewire 100 to smoothly enter the blood vessel.

[0077] like Figure 4 As shown, in some embodiments, the marking guide wire 100 further includes a traction wire 60. The proximal end of the traction wire 60 is used to connect to the bending handle 90. A steering assembly 16 is provided inside the core wire 10. The steering assembly 16 includes at least one guide wheel 161 arranged radially along the guide wire. The distal end of the traction wire 60 passes around at least one guide wheel 161 in sequence and is fixedly connected to the distal end of the thinning section 15. Specifically, after the distal end of the traction wire 60 passes around the guide wheel 161, the traction wire 60 will deflect. When the proximal end pulls the traction wire 60, the portion of the traction wire 60 from the proximal end to the guide wheel 161 moves along the axial direction of the core wire 10, while the portion of the traction wire 60 located at the distal end of the steering assembly 16 can use the steering assembly 16 as a support point to drive the distal portion of the marking guide wire 100 to bend. The bending assembly can pull the traction wire 60, causing the distal end of the traction wire 60 to pull the distal end of the thinning segment 15, thereby causing the thinning segment 15 to bend. This allows the marking guide wire 100 to be smoothly inserted into the lesion location. In this embodiment, the steering assembly 16 can serve as a support point when the traction wire 60 bends, enabling the thinning segment 15 to bend stably and preventing the imaging segment 13 and the main body segment 11 from developing a convex shape due to the bending of the thinning segment 15.

[0078] For example, such as Figure 5As shown, the core wire 10 has a cavity 171, and the core wire 10 has a first bending wire channel 172 and a second bending wire channel (not shown). The proximal end of the cavity 171 is connected to the first bending wire channel 172, and the distal end of the cavity 171 is connected to the second bending wire channel. The steering assembly 16 is disposed in the cavity 171. A proximal section of the traction wire 60 passes through the first bending wire channel 172, and the portion of the traction wire 60 passing through the cavity 171 successively wraps around at least one guide wheel 161. The distal section of the traction wire 60 passes through the second bending wire channel. In this way, by pulling the traction wire 60, the thinned section 15 is stably bent. Furthermore, a capillary steel tube is provided in the first bending wire channel 172, and the inside of the capillary steel tube is coated with a PTFE coating. The traction wire 60 passes through the capillary steel tube. The capillary steel tube supports the traction wire 60, and the coating on the inner wall of the capillary steel tube reduces bending resistance. It should be noted that the cavity 171 can be formed on the core wire 10 by cutting or drilling on its outer surface. Then, a first bending wire channel 172 and a second bending wire channel, connected to the cavity 171, are formed by drilling or other methods. Next, the guide wheel 161 is installed inside the cavity 171, and the distal end of the traction wire 60 is passed through the proximal end of the first bending wire channel 172, exits from the distal end of the first bending wire channel 172, enters the cavity 171 to engage with the guide wheel 161, then enters the second bending wire channel, and finally exits from the distal end of the second bending wire channel. After completing the above operations, the cavity 171 can be filled, for example by setting a sealing cap to seal the notch of the cavity 171, fixing the sealing cap on the core wire 10, and polishing the outer surface of the sealing cap to keep the outer surface of the core wire 10 flat and smooth.

[0079] For example, the steering assembly 16 is located at the developing section 13, so that the traction wire 60 can use the steering assembly 16 as a support point to act on the entire refining section 15, so as to facilitate the bending of the refining section 15.

[0080] For example, the guide wheel 161 is provided with a groove, and the traction wire 60 is placed in the groove to ensure that the traction wire 60 can stably pass around the guide wheel 161 and is not easily moved relative to the guide wheel 161 along its axial direction, so as to facilitate the stable bending of the traction wire 60. For example, the guide wheel 161 is provided with an arc-shaped groove that matches the traction wire 60 so as to stably pass the traction wire 60 around the guide wheel 161.

[0081] In some embodiments, the guide wheel 161 is fixedly connected to the core wire 10, so that when the traction wire 60 is pulled, the traction wire 60 actually slides relative to the guide wheel 161. This construction has lower cost and is easier to manufacture. In other embodiments, the guide wheel 161 is rotatably connected to the core wire 10, so that when the traction wire 60 is pulled, the traction wire 60 can drive the guide wheel 161 to rotate synchronously. This reduces the force required to pull the traction wire 60 and is beneficial for bending operations.

[0082] like Figure 4 As shown, in some embodiments, the steering assembly has two guide wheels 161. Specifically, the distal end of the traction wire 60 passes around the distal end of one of the guide wheels 161, then passes between the two guide wheels 161, passes around the proximal end of the other guide wheel 161, and then extends to the distal end of the thinning segment 15, where it is fixedly connected. In this way, the traction wire 60 is divided into two segments by the steering assembly 16, with one proximal segment located on one side of the steering assembly 16 and offset from the center of the core wire 10, and the distal segment located on the other side of the steering assembly 16 and offset from the center of the core wire 10.

[0083] like Figure 4 As shown, by way of example, the two guide wheels 161 are arranged side by side along the proximal to distal end of the core wire 10. This reduces the force required to pull the traction wire 60, which is beneficial for bending operations and further avoids the bowing phenomenon caused by the bending of the developing section 13 and the main body section 11 due to the bending of the refining section 15.

[0084] In another example, the two guide wheels 161 are staggered from the proximal to the distal end of the core wire 10. For example Figure 7 As shown, the guide wheel 161, which passes around the proximal end of the traction wire 60, is close to the proximal end of the core wire 10, and the guide wheel 161, which passes around the distal end of the traction wire 60, is close to the distal end of the core wire 10. This further reduces the force required to pull the traction wire 60, which is beneficial for bending operations. For example... Figure 6 As shown, the guide wheel 161, which passes around the proximal end of the traction wire 60, is close to the distal end of the core wire 10. This further avoids the developing section 13 and the main body section 11 from being affected by the bending of the thinning section 15 and causing a bowing phenomenon, thus ensuring that the bending end can be bent stably.

[0085] like Figure 8As shown, in some embodiments, the steering assembly is provided with a guide wheel 161. Specifically, the distal end of the traction wire 60 bypasses the distal end of the guide wheel 161, then extends obliquely to the second transition section 14, and passes through the developing sleeve 81 to be fixedly connected to the distal end of the thinning section 15. Under the action of the developing sleeve 81 and the guide wheel 161, the traction wire 60 is divided into two sections, with one proximal section located on one side of the steering assembly 16 and offset from the center of the core wire 10, and the distal section located on the other side of the steering assembly 16 and offset from the center of the core wire 10. When the traction wire is pulled proximally, the proximal ends of the steering assembly 16 and the developing sleeve 81 can serve as support points when the traction wire 60 bends, allowing the thinning section 15 to bend stably without bowing due to the overall stress on the marking guide wire 100.

[0086] like Figure 4 As shown, in some embodiments, the marking guide wire 100 further includes a retaining ring 70, which is fixed to the distal end of the thinning segment 15. For example, the retaining ring 70 is fixedly sleeved on the protrusion 151, which facilitates the stable installation of the retaining ring 70. The distal end of the traction wire 60 is fixedly connected to one side of the retaining ring 70. When the traction wire 60 is pulled, the distal end of the thinning segment 15 can be bent to one side by pulling one side of the retaining ring 70, thereby achieving the bending adjustment of the thinning segment 15.

[0087] For example, the fixation ring 70 is a radiopaque fixation ring, which facilitates observation of the distal position of the marker guidewire 100, so as to allow the marker guidewire 100 to be inserted into the lesion site to establish a channel. For example, the fixation ring 70 can be a tungsten-containing tube or other radiopaque structure.

[0088] like Figure 4As shown, in some embodiments, the marking guide wire 100 further includes a developing sheath 81, which is arranged side-by-side with the thinning section 15. The distal end of the traction wire 60 passes through the developing sheath 81 and is fixedly connected to the distal end of the core wire 10. It should be noted that the distal end of the traction wire 60 has a suspended portion when extending to the thinning section 15. Specifically, after the traction wire 60 extends from the second bending wire cavity, it passes through the second transition section 14, passes through the thinning section 15, and is fixed to the core wire 10 at the distal end of the thinning section 15. This portion of the traction wire 60 in the thinning section 15 is in a suspended state. In this embodiment, the developing sheath 81 supports the suspended portion of the traction wire 60 to ensure stable pulling of the traction wire 60, thereby achieving bending of the thinning section 15. In addition, the contrast-enhancing sheath 81 has a contrast-enhancing effect, allowing observation during the insertion of the marker guidewire 100. This enables the determination of the bending direction of the thinned segment 15 during the bending process, facilitating the insertion of the marker guidewire 100 into the lesion location. Simultaneously, the contrast-enhancing sheath 81 also ensures the direction of movement of the traction wire 60, allowing the distal end of the traction wire 60 to move along the length of the contrast-enhancing sheath 81.

[0089] like Figure 4 and Figure 5 As shown, in some embodiments, the proximal end of the marker guidewire 100 is provided with a connecting thread 18 for threaded connection with the bending handle 90, so as to realize quick installation and removal of the bending handle 90 and the marker guidewire 100. When it is necessary to insert the marker guidewire 100 into the lesion, the bending handle 90 can be installed to bend the thinning section 15, so that the marker guidewire 100 can smoothly enter the lesion. When it is necessary to insert other medical devices from the proximal end of the marker guidewire 100 into the lesion, the bending handle 90 can be removed to avoid the bending handle 90 obstructing the intervention of other medical devices.

[0090] like Figure 4 As shown, in some embodiments, the bending handle 90 has a bending knob 91 on its side. The bending knob 91 is connected to the proximal end of the traction wire 60. By rotating the bending knob 91, the bending knob 91 is moved away from the marker guidewire 100, thereby pulling the traction wire 60 and bending the thinned segment 15. Compared with axial bending, this avoids rotating the marker guidewire 100 during bending, ensuring that the marker guidewire 100 can be stably and reliably inserted into the lesion location.

[0091] For example, the side of the bending handle 90 is provided with an inclined rotating part (not shown in the figure), the bending knob 91 is rotatably sleeved on the rotating part and threadedly engaged with the rotating part, the proximal end of the traction wire 60 is fixed to the bending knob 91, and when the bending knob 91 rotates relative to the rotating part to move, it pulls the traction wire 60 to achieve bending.

[0092] likeFigure 4 and Figure 9 As shown, in some embodiments, the marker guidewire 100 further includes a protective tube 82 and a heat-shrinkable film 83. The protective tube 82 is located at the proximal end of the core wire 10, and the heat-shrinkable film 83 covers the proximal end of the core wire 10 and the protective tube 82. The traction wire 60 passes through the protective tube 82. It should be noted that after the marker guidewire 100 enters the designated position, the traction wire 60 and the bending knob 91 can be separated, and the bending handle 90 can be removed from the marker guidewire 100. At this time, a portion of the proximal end of the traction wire 60 is still exposed outside the marker guidewire 100. To avoid interference with other medical devices when passing through the marker guidewire 100, the exposed portion of the traction wire 60 generally needs to be cut off. In this embodiment, the heat-shrink film 83 can be used to fix the protective tube 82 to the core wire 10, and the traction wire 60 can move inside the protective tube 82 to ensure the bending function is realized. The traction wire 60 is threaded through the protective tube 82. When it is necessary to cut off the exposed part of the traction wire 60, the traction wire 60 will still be placed in the protective tube 82. Thus, if the bending function is still needed, the heat-shrink film 83 can be removed, the protective tube 82 can be removed, so that the proximal part of the traction wire 60 is exposed, and after the bending handle 90 and the marking guide wire 100 are installed, the exposed part of the traction wire 60 can be connected with the bending knob 91 to realize the bending function again.

[0093] For example, multiple protective tubes 82 can be set as needed to enable repeated bending functions.

[0094] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the content of this application's specification and drawings under the concept of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A marker guidewire, characterized in that, include: The core wire includes a main body segment, a first transition segment, a developing segment, a second transition segment, a thinning segment, and a protrusion; the main body segment, the first transition segment, the developing segment, the second transition segment, the thinning segment, and the protrusion are connected sequentially from the proximal end to the distal end of the core wire; Multiple developing rings are disposed in the developing section and are evenly spaced within the developing section. A spring is disposed around the periphery of the core wire and surrounds the plurality of developing rings.

2. The marker guidewire as described in claim 1, characterized in that, The diameter of the first transition section gradually decreases from the proximal end to the distal end, the diameter of the second transition section gradually decreases from the proximal end to the distal end, and the diameter of the protrusion is larger than the diameter of the thinning section.

3. The marker guidewire as described in claim 1, characterized in that, The developing section is provided with a plurality of annular grooves that are evenly spaced apart, and the plurality of developing rings are respectively arranged in a one-to-one correspondence with the plurality of annular grooves.

4. The marker guidewire as described in claim 1, characterized in that, It also includes a covering portion, which surrounds the developing section and covers the plurality of developing rings. After the spring is surrounded on the covering portion, the diameter of the marking guide wire on the main body section is the same as the diameter of the marking guide wire on the developing section.

5. The marker guidewire as described in claim 1, characterized in that, The spring includes a first spring portion and a second spring portion, which are arranged sequentially from the proximal end to the distal end of the core wire. The distal end of the first spring portion is welded and fixed to the distal end side of the core wire, the proximal end of the first spring portion is welded and fixed to the proximal end of the core wire, the distal end of the second spring portion is welded and fixed to the distal end of the core wire, and the proximal end of the second spring portion is welded and fixed to the core wire located on the distal end side of the first spring portion.

6. The marker guidewire as described in claim 5, characterized in that, The first spring portion and the second spring portion are spaced apart, and the marking guide wire further includes a welding section, which is disposed between the first spring portion and the second spring portion; Alternatively, the marking guide wire may further include a fixing tube disposed between the first spring portion and the second spring portion, with the proximal end of the fixing tube welded to the distal end of the first spring portion and the distal end of the fixing tube welded to the proximal end of the second spring portion.

7. The marker guidewire as described in claim 6, characterized in that, The distance between the welding section or the fixed tube and the distal end of the marking guide wire is 200mm-220mm, and the length of the welding section or the fixed tube in the axial direction is 1mm-3mm.

8. The marker guidewire as described in claim 1, characterized in that, It also includes a traction wire and a bending handle, wherein the bending handle is detachably connected to the proximal end of the core wire, the proximal end of the traction wire is connected to the bending handle, and the distal end of the traction wire is fixedly connected to the distal end of the marking guide wire.

9. The marker guidewire as described in claim 8, characterized in that, It also includes a protective tube and a heat-shrinkable film. The protective tube is located at the proximal end of the core wire, and the heat-shrinkable film covers the proximal end of the core wire and the protective tube. The traction wire passes through the proximal end of the core wire and is then inserted into the protective tube.

10. The marker guidewire as described in claim 8, characterized in that, It also includes a developing sleeve, which is arranged along the axial direction of the thinning section between the thinning section and the spring. The distal end of the traction wire passes through the developing sleeve and is fixedly connected to the distal end of the core wire.

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