Micro guide wire with distance measuring function

Abstract

The micro guide wire with the distance measuring function comprises a guide wire assembly, the guide wire assembly comprises a core wire and developing parts, the developing parts are of a cylinder structure and are made of developing materials, the number of the developing parts is multiple, each developing part has a preset length in the axial direction, the developing parts are at least fixedly arranged at the far end of the core wire, and the developing parts are arranged at the far end of the core wire; and the developing parts are arranged on the core wire at equal intervals. The developing parts with the preset length are arranged at the at least far end part of the core wire at equal intervals, so that an operator can estimate the narrow length more easily during use, the clinical operator can be helped to judge the lesion length more effectively, and a more reasonable quality scheme can be selected. Developing parts with preset lengths are arranged in the guide wire assembly at equal intervals, the guide wire assembly is provided with segmental developing points on a developing image, and a clinical operator can measure the vascular occlusion length through the segmental developing points.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and particularly to a micro-guidewire with a ranging function. Background Art

[0002] When treating chronic vascular occlusion in an interventional manner, since three-dimensional angiography cannot be performed before the occlusion is opened, it is difficult for clinicians to accurately measure the length of the occlusion clinically. In the 2D roadmap mode, the measured distance will also deviate from the actual distance.

[0003] Specifically, in the prior art, the continuous micro-guidewire imaging structure utilizes the radiopaque ability of heavy metals or heavy metal alloy wires and is wound into a soft spring shape for imaging. Such an imaging structure appears as a black line under a clinical DSA device.

[0004] However, the "black line" structure under a clinical DSA device cannot measure the stenosis length, resulting in the inability to effectively assist clinicians in judging the lesion length and making it difficult for clinicians to select the most reasonable treatment plan. Summary of the Invention

[0005] In view of this, the present application provides a micro-guidewire with a ranging function, including a guidewire assembly. The guidewire assembly includes a core wire and an imaging part. The imaging part is in a columnar structure, made of an imaging material, and the number of the imaging parts is multiple. Each imaging part has a preset length in its axial direction. The imaging part is at least fixedly arranged at the distal end of the core wire, and the imaging parts are equally spaced on the core wire.

[0006] In a possible implementation manner, the imaging part includes a cutting tube and a connecting section. The cutting tube is a cylindrical tube, and both ends of the connecting section are respectively connected to adjacent cutting tubes.

[0007] In a possible implementation manner, two hollow holes are symmetrically formed on the side wall of the cutting tube, and the cutting tube and the connecting section are integrally formed.

[0008] In a possible implementation manner, the cutting tube at the farthest end of the core wire is a distal cutting tube, and the axial length of the distal cutting tube is less than the axial length of the cutting tube. The cutting tube at the nearest end of the core wire is a proximal cutting tube, and the axial length of the proximal cutting tube is greater than the axial length of the cutting tube.

[0009] In a possible implementation, the developing part includes a first developing spring and a second developing spring; the first developing spring has a first preset pitch, and the second developing spring has a second preset pitch; the first developing spring and the second developing spring are alternately arranged on the core wire; the first developing spring is fixed to the core wire by welding or bonding; the second developing spring is fixed to the core wire by welding or bonding.

[0010] In a possible implementation, the developing part includes a first developing spring and an outer developing spring; the diameter of the outer developing spring is slightly larger than that of the first developing spring, the number of the outer developing springs is multiple, and the multiple outer developing springs are sleeved on the first developing spring at equal intervals; the first developing spring has a first preset pitch, the outer developing spring has a third preset pitch, and the first preset pitch is greater than the third preset pitch; the first developing spring is fixed to the core wire by welding or bonding; the outer developing spring is fixed to the first developing spring by welding or bonding.

[0011] In a possible implementation, the developing part includes a hypo tube; the hypo tube is arranged on the outermost periphery of the wire guiding assembly, a hollow groove is formed in the side wall of the hypo tube, a metal coating is arranged on the outer wall of the hypo tube, and the hypo tube with the metal coating on the surface is a coating section, the coating section has developability, and the coating sections are arranged on the hypo tube at equal intervals.

[0012] In a possible implementation, when the first developing spring is included in the developing part; the number of the first developing springs is multiple, the first developing springs are arranged on the core wire at equal intervals, and the hypo tube is arranged to cover the outer periphery of the first developing spring; the setting positions of the coating sections on the core wire correspond to those of the first developing springs, and the side projection of the coating section completely covers the side projection of the corresponding first developing spring.

[0013] In a possible implementation, when the developing part has two or more developing layers, in the same light environment, the developing degree of the developing layer located in the more outer peripheral direction of the core wire is greater than that of the inner developing layer.

[0014] In a possible implementation, the axial length range of each developing part is 0.5 mm - 1 mm.

[0015] The beneficial effects of this application: By equally spacing developing parts with a preset length on at least the distal part of the core wire, when in use, it is easier for the operator to estimate the stenosis length, more effectively helps the clinical operator to judge the lesion length, and then select a more reasonable treatment plan.

[0016] More specifically, the development portions with a preset length are arranged at equal intervals within the guide wire assembly. The guide wire assembly has segmental development points on the development image, and the clinical operator can measure the length of the vascular occlusion through such segmental development points. It should be particularly noted that the preset length of the development portions described in this application is at the millimeter level. This design can accurately measure the length of any vascular occlusion to the millimeter level during the operation, thereby helping the operator to judge the length of the blood vessel and then select the optimal surgical plan.

[0017] Other features and aspects of the present application will become clear from the following detailed description of the exemplary embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are included in and constitute a part of this specification, illustrate the exemplary embodiments, features, and aspects of the present application together with the specification, and are used to explain the principles of the present application.

[0019] Figure 1 Schematic cross-sectional view of the micro-guide wire with a ranging function showing an embodiment of the present application;

[0020] Figure 2 Stereoscopic structure diagram of the cutting tube showing an embodiment of the present application;

[0021] Figure 3 Side view of the cutting tube showing an embodiment of the present application;

[0022] Figure 4 Stereoscopic structure diagram of the cutting tube showing another embodiment of the present application;

[0023] Figure 5 Side view of the cutting tube showing another embodiment of the present application;

[0024] Figure 6 Schematic cross-sectional structure diagram of the micro-guide wire with a ranging function showing a second embodiment of the present application;

[0025] Figure 7 Schematic cross-sectional structure diagram of the micro-guide wire with a ranging function showing a third embodiment of the present application;

[0026] Figure 8 Schematic side view of the first development spring showing an embodiment of the present application;

[0027] Figure 9 Schematic cross-sectional view of the micro-guide wire with a ranging function showing a fourth embodiment of the present application;

[0028] Figure 10 Schematic side view of the assembly of the first development spring and the outer ring development spring showing an embodiment of the present application;

[0029] Figure 11A schematic side structural diagram showing the assembly of a first developing spring and an outer ring developing spring according to another embodiment of the present application;

[0030] Figure 12 A schematic diagram showing the main structure of a hypotube according to an embodiment of the present application is shown;

[0031] Figure 13 A cross-sectional schematic diagram of a micro guidewire with a distance measuring function and a plated-segment hypotube according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0032] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0033] Among them, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0036] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0037] like Figures 1-13As shown in the figure, the micro-guidewire with ranging function includes: a guidewire assembly, which includes a core wire 30 and a visualization part. The visualization part has a cylindrical structure, is made of a visualization material, and the number of visualization parts is multiple. Each visualization part has a preset length in its axial direction. The visualization part is at least fixedly arranged at the distal end of the core wire 30, and the visualization parts are arranged at equal intervals on the core wire 30.

[0038] In this embodiment, by arranging visualization parts with a preset length at equal intervals on at least the distal end part of the core wire 30, when in use, the operator is more likely to estimate the stenosis length, and can more effectively help the clinical operator judge the lesion length, and then select a more reasonable treatment plan.

[0039] More specifically, visualization parts with a preset length are arranged at equal intervals within the guidewire assembly. The guidewire assembly has segmental visualization points on the visualization image, and the clinical operator can measure the length of the vascular occlusion through such segmental visualization points. It should be particularly noted that the preset length of the visualization part described in this application is at the millimeter level. This design can accurately measure the length of any vascular occlusion to the millimeter level during the operation, so as to help the operator judge the vascular length and then select the optimal surgical plan.

[0040] Preferably, the axial length range of the visualization part is 0.5 mm - 1 mm.

[0041] As Figures 1-5 shown, in one specific embodiment, the visualization part includes a cutting tube 15 and a connecting section 16. The cutting tube 15 is a cylindrical tube, and both ends of the connecting section 16 are respectively connected to adjacent cutting tubes 15.

[0042] Preferably, the cutting tube 15 and the connecting section 16 are integrally formed.

[0043] In the above embodiment, the cutting tube 15 is usually a cylindrical tube structure made of a radiopaque heavy metal or heavy metal alloy material, and through the processing of the cutting tube 15, it is convenient to control the specific visualization structure of the cutting tube 15 on the visualization image. The connecting section 16 connecting two adjacent cutting tubes 15 is mainly used to increase the flexibility of the cutting tube 15, thereby improving the overall passability of the guidewire assembly, and avoiding the increase in the overall hardness of the guidewire assembly caused by the introduction of the cutting catheter, which has an adverse impact on the operation. Moreover, various hollow patterns can be designed on the surface of the cutting tube 15 to balance its visualization property and the overall flexibility of the guidewire assembly. No more limitations are made on the specific patterns in this embodiment.

[0044] Preferably, two hollow holes 153 are symmetrically opened on the side wall of the cutting tube 15. The hollow holes 153 are rectangular holes, and the length direction of the hollow holes 153 is the same as the axial direction of the cutting tube 15. The side projection area of the hollow holes 153 accounts for 1 / 5 - 3 / 5 of the total side projection of the cutting tube 15.

[0045] In one specific embodiment, the cutting tube 15 at the outermost distal end of the core wire 30 is the distal cutting tube 151, and the axial length of the distal cutting tube 151 is less than the axial length of the cutting tube 15. The cutting tube 15 at the nearest proximal end of the core wire 30 is the proximal cutting tube 152, and the axial length of the proximal cutting tube 152 is greater than the axial length of the cutting tube 15.

[0046] In this embodiment, the axial length of the distal cutting tube 151 is less than its diameter length; the axial length of the proximal cutting tube 152 is greater than the axial length of the conventional cutting tube 15 located in the middle of the core wire 30. It can be understood that, compared with the conventional cutting tube 15, an extension section is added to the proximal end of the proximal cutting tube 152 to increase the contact area at the connection position with other clinical instruments, so as to improve the connection stability of the overall instrument. The volume of the distal cutting tube 151 is designed to be as small as possible to ensure the passing performance of the guide wire assembly and the smoothness and safety at the distal end, with good safety and no damage to the human body.

[0047] Furthermore, the connection section 16 presents a rectangular structure in the side projection of the guide wire assembly. The length direction of the connection section 16 is parallel to the axial direction of the guide wire assembly. Correspondingly, the width direction of the connection section 16 is perpendicular to the axial direction of the guide wire assembly. Herein, the side projection refers to the projection perpendicular to the axial direction of the guide wire assembly.

[0048] In one specific embodiment, the connection section 16 can be in the structure of a slender connection section 161 or a wide-body connection section 162.

[0049] Specifically, as Figure 4 、 Figure 5 shown, the slender connection section 161 has a slender strip structure. The slender connection section 161 is connected to the cutting tube 15 from the opposite sides of the core wire 30 respectively. While ensuring the stable connection of the adjacent cutting tubes 15, it can also have a certain flexibility, and still ensure good passing performance of the guide wire assembly on the premise of ensuring the imaging effect.

[0050] Preferably, the cutting tube 15 is symmetrically provided with hollow holes 153, and the side projection of the hollow holes 153 is rectangular. The length direction of the hollow holes 153 is arranged in the same direction as the axial direction of the cutting tube 15. The center line in the length direction of the slender connection section 161 coincides with the center line of the hollow holes 153 on the cutting tube 15.

[0051] As Figure 2 、 Figure 3 shown, for the wide-body connection section 162, the width of the wide-body connection section 162 is at least greater than 1 / 3 of the diameter of the cutting tube 15, and the wide-body connection section 162 is only arranged on one side of the adjacent cutting tubes 15.

[0052] Preferably, the cutting tube 15 is symmetrically provided with hollow holes 153, and the side projection of the hollow holes 153 is rectangular, the length direction of the hollow holes 153 is arranged in the same direction as the axial direction of the cutting tube 15, and the center line of the length direction of the wide body connecting section 162 coincides with the center line of the hollow holes 153 on the cutting tube 15 ( Figure 5 shown).

[0053] In one specific embodiment, the core wire 30 is welded or bonded to the cutting tube 15, and a sea wave tube 40 is sleeved on the outer periphery of the cutting tube 15. The sea wave tube 40 is arranged at the outermost periphery of the guide wire assembly, and a hollow groove is opened on the side wall of the sea wave tube 40. The outer wall of the sea wave tube 40 is provided with a metal coating. The sea wave tube 40 coated with the metal coating is a coating segment 41. The coating segment 41 has developability, and the coating segment 41 is arranged at equal intervals on the sea wave tube 40.

[0054] In this embodiment, the double-layer development structure, i.e., the outer development layer is the coating segment 41, and the inner development layer is the whole composed of the cutting tube 15 and the connecting piece, makes the double-layer development micro-guidewire present different development degrees under the clinical DSA equipment, i.e., black-gray-black-gray development segments, and the clinical operator can measure the vascular occlusion length according to the number of the development segments.

[0055] Preferably, under the same lighting conditions, the development degree of the outer development layer is greater than that of the inner development layer. The outer layer has a greater development degree than the inner layer, and has a higher development contrast in the development image, so that the clinical operator can observe the image more clearly and intuitively - judging the corresponding vascular occlusion length by the number of black spots in the development image.

[0056] In one specific embodiment, the side projection of the coating section 41 on the hypotube 40 completely covers the side projection of the cutting tube 15 .

[0057] Specifically, the axial length of the coating section 41 can be equal to the axial length of the cutting tube 15, and the relative positions of the two on the core wire 30 correspond to each other. On the basis of increasing the contrast of the imaging, the edge of the imaging is clearer, which is more conducive to the operator to judge the length of the occlusion in the blood vessel.

[0058] like Figures 6-8 As shown, in one specific embodiment, the developing part includes a first developing spring 11 and a second developing spring 12, the first developing spring 11 has a first preset pitch, the second developing spring 12 has a second preset pitch, the first developing spring 11 and the second developing spring 12 are alternately arranged on the core wire 30, the first developing spring 11 and the core wire 30 are welded or bonded and fixed, and the second developing spring 12 and the core wire 30 are welded or bonded and fixed.

[0059] Further, the adjacent first developing spring 11 and the second developing spring 12 are connected. Preferably, the plurality of first developing springs 11 and the plurality of second developing springs 12 are integrally formed.

[0060] In this embodiment, the first developing spring 11 and the second developing spring 12 are integrally formed, that is, the two are the same spring. Only at the position of the second developing spring 12 at equal intervals, it only needs to be stretched to reach the second preset pitch. It should be particularly noted here that the variable pitch spring is a spring structure in which the pitch of each spring segment in the developing spring is different. In the present application, the second developing spring 12 can be stretched by relevant equipment so that the second developing spring 12 segment finally has the largest pitch in the middle and gradually decreases towards both ends. Specifically, as Figure 8 shown, the pitch of the stretched second developing spring 12 continuously changes. Usually, the pitch is the largest at the middle position of the second developing spring 12 and gradually becomes smaller towards both ends of the second developing spring 12.

[0061] In one specific embodiment, the developing spring at the farthest end of the core wire 30 is the first developing spring 11.

[0062] In one specific embodiment, the second developing spring 12 is a variable pitch spring, and the pitch of each segment of the second developing spring 12 gradually decreases from the middle to both ends.

[0063] In one specific embodiment, the developing degree of the first developing spring 11 is greater than or equal to the developing degree of the second developing spring 12.

[0064] More specifically, as Figure 6 shown, for the core wire 30 with the first developing springs 11 completely segmented and equally spaced, the developing image in clinical DSA is a plurality of equally spaced small black segments; while Figure 7 shown in the solution, the integrally formed first developing spring 11 and second developing spring 12, and the core wire 30 of the solution where the second developing spring 12 is a variable pitch spring, the developing image in clinical DSA is black and gray alternating developing segments. The equally spaced small black segments have higher developing contrast compared to the black and gray alternating developing segments, which is more conducive for clinical operators to judge the corresponding blood vessel length by the number of black dots.

[0065] As Figures 9-11As shown, in one specific embodiment, the developing part includes a first developing spring 11 and an outer ring developing spring 14, the diameter of the outer ring developing spring 14 is slightly larger than the diameter of the first developing spring 11, the number of the outer ring developing springs 14 is multiple, and the multiple outer ring developing springs 14 are equidistantly arranged on the first developing spring 11, the first developing spring 11 has a first preset pitch, the outer ring developing spring 14 has a third preset pitch, the first preset pitch is larger than the third preset pitch, the first developing spring is welded or bonded to the core wire 30, and the outer ring developing spring 14 is welded or bonded to the first developing spring.

[0066] like Figure 9 As shown, an outer ring developing spring 14 is additionally added on the basis of the first developing spring 11, and under the same lighting conditions, the developing degree of the outer ring developing spring 14 is greater than the developing degree of the first developing spring 11, so that the double-layer developing micro-guidewire presents different developing degrees under the clinical DSA equipment, namely, black-gray-black-gray developing segments, and the clinical operator can measure the length of the vascular occlusion by the number of the developing segments.

[0067] like Figure 11 As shown, further, the outer ring developing spring 14 is a hollow cylindrical sleeve, and the sleeve material can be a precious metal or a precious metal alloy, and at least ensure that the sleeve has a greater development degree than the first developing spring 11 under the same lighting environment. Compared with the method of sleeve-arranging developing sleeves at equal intervals on the outer layer of the first developing spring 11 at equal intervals, the method has a higher development contrast, which is more conducive to clinical operators to judge the corresponding blood vessel length by the number of black spots.

[0068] like Figure 12 , Figure 13 As shown, in one specific embodiment, the developing part includes a sea wave tube 40, which is arranged at the outermost periphery of the guide wire assembly, a hollow groove is opened on the side wall of the sea wave tube 40, and the outer wall of the sea wave tube 40 is provided with a metal coating, and the sea wave tube 40 coated with the metal coating on the surface is a coating segment 41, and the coating segment 41 has a developing property, and the coating segment 41 is evenly spaced on the sea wave tube 40.

[0069] In one specific embodiment, when there is a first developing spring 11 in the developing part, there are multiple first developing springs 11, and the first developing springs 11 are evenly spaced on the core wire 30. The sea wave tube 40 is wrapped around the outer periphery of the first developing spring 11. The coating section 41 corresponds to the setting position of the first developing spring 11 on the core wire 30, and the side projection of the coating section 41 completely covers the side projection of the corresponding first developing spring 11.

[0070] In one specific embodiment, when the developing portion has more than two developing layers, under the same lighting environment, the developing degree of the developing layer located in the outer peripheral direction of the core filament 30 is greater than the developing degree of the developing layer located in the inner side.

[0071] The outer wall of the sea wave tube 40 is subjected to segmented metal coating by electroplating or magnetron sputtering process, so that the microguidewire with the coated segment 41 has developability, and the microguidewire with the uncoated segment 42 has no developability, so that the microguidewire is presented as a plurality of equally spaced small black segments in the clinical DSA developable image, which is different from the conventional whole black segment image. The operator can use the developable segment as a measurement reference in the blood vessel, and the operator can calculate the corresponding blood vessel length by using the number of segments.

[0072] Preferably, the plating solution of the plating section 41 is made of gold.

[0073] like Figure 13 As shown, in one specific embodiment, it further includes a first developing spring 11, which is made of a developing material, and there are multiple first developing springs 11, and the multiple first developing springs 11 are evenly spaced and arranged on the core wire 30, and the first developing spring 11 is located inside the hypotube 40. The coating section 41 is coated on the outer periphery of the first developing spring 11, and the side projection of the first developing spring 11 overlaps with the side projection of the coating section 41.

[0074] In this embodiment, a first developing spring 11 is further provided in the space between the core wire 30 and the hypotube 40. The first developing spring 11 is passed through the core wire 30, and the first developing spring 11 is entirely located inside the hypotube 40. The first developing spring 11 overlaps with the coating section 41 of the hypotube 40, and the developing property of the overlapping position is further enhanced compared to the hypotube 40 which is not provided with the first developing spring 11 and only has the coating section 41.

[0075] In one specific embodiment, under the same lighting environment, the development degree of the coating section 41 is greater than or equal to the development degree of the first development spring 11 .

[0076] In one specific embodiment, the axial length of the coating section 41 is greater than the axial length of the first developing spring 11 .

[0077] In one specific embodiment, the axial length of each first developing spring 11 is equal, and the setting position of the coating section 41 on the sea wave tube 40 completely corresponds to the setting position of the first developing spring 11 on the core wire 30, that is, the axial length of the coating section 41 is equal to the axial length of the first developing spring 11.

[0078] In one specific embodiment, the hypotube 40 is fixed to the first developing spring 11 by welding or bonding.

[0079] In one specific embodiment, the first developing spring 11 is fixed to the core wire 30 by welding or bonding.

[0080] It should also be clarified that the first developing spring 11 can be arranged on the core wire 30 in multiple sections at equal intervals, or can be a whole section structure inserted on the core wire 30. It can be simply understood that when there is only one developing layer, the first developing spring 11 must be designed in multiple sections; and when there are two or more developing layers, the whole section or multiple sections can be selected according to the needs to be arranged on the core wire 30. In some usage scenarios, in order to ensure that the guide wire assembly as a whole has a certain axial rigidity, the first developing spring 11 can be designed as a whole section.

[0081] In summary, in the micro guidewire with ranging function described in the present application, the axis of the guidewire assembly is the core wire 30, the outermost periphery is the sea wave tube 40, and the middle layer is selected from one of the developing springs or the cutting tube 15.

[0082] In one specific embodiment, the cutting tube 15 and the connecting section 16 together constitute a developing connecting tube; specifically, a first developing spring 11 / developing connecting tube is passed through the core wire 30, and the first developing spring 11 / cutting tube 15 is arranged on the core wire 30 at equal intervals.

[0083] The sea wave tube 40 is arranged at the outermost periphery of the guide wire assembly, a hollow groove is opened on the side wall of the sea wave tube 40, and a metal coating is provided on the outer wall of the sea wave tube 40. The sea wave tube coated with the metal coating is a coating segment 41, and the coating segment 41 has developability. The coating segments 41 are arranged at equal intervals on the sea wave tube 40.

[0084] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A micro-guidewire with a ranging function, characterized in that, It includes a guide wire assembly, wherein the guide wire assembly includes a core wire and a developing part; The developing part is a columnar structure, the developing part is made of a developing material, and there are multiple developing parts, each of which has a preset length in its axial direction; The developing part is at least fixedly arranged at the distal end of the core wire, and the developing parts are arranged at equal intervals on the core wire.

2. The micro-guidewire with a ranging function according to claim 1, wherein The developing section includes a cutting tube and a connecting section; The cutting tube is a cylindrical tube, and both ends of the connecting section are respectively connected to adjacent cutting tubes.

3. The micro-guidewire with a ranging function according to claim 2, characterized in that, Two hollow holes are symmetrically provided on the side wall of the cutting tube, and the cutting tube and the connecting section are integrally formed.

4. The micro-guidewire with a ranging function according to claim 2, wherein, The cutting tube located at the farthest end of the core wire is a distal cutting tube, and the axial length of the distal cutting tube is smaller than the axial length of the cutting tube; The cutting tube located at the nearest end of the core wire is a proximal cutting tube, and the axial length of the proximal cutting tube is greater than the axial length of the cutting tube.

5. The micro-guidewire with a ranging function according to claim 1, wherein The developing part includes a first developing spring and a second developing spring; The first developing spring has a first preset pitch, and the second developing spring has a second preset pitch; The first developing spring and the second developing spring are alternately arranged on the core wire; The first developing spring is fixed to the core wire by welding or bonding; The second developing spring is fixed to the core wire by welding or bonding.

6. The micro-guidewire with a ranging function according to claim 1, characterized in that, The developing part comprises a first developing spring and an outer ring developing spring; The diameter of the outer ring developing spring is slightly larger than the diameter of the first developing spring. There are multiple outer ring developing springs, and the multiple outer ring developing springs are sleeved on the first developing spring at equal intervals. The first developing spring has a first preset pitch, the outer ring developing spring has a third preset pitch, and the first preset pitch is greater than the third preset pitch; The first developing spring is fixed to the core wire by welding or bonding; The outer ring developing spring is fixed to the first developing spring by welding or bonding.

7. The micro-guide wire with a ranging function according to any one of claims 1-6, characterized in that, The developing unit includes a hypotube; The hypotube is arranged at the outermost periphery of the guide wire assembly, a hollow groove is opened on the side wall of the hypotube, and a metal coating is provided on the outer wall of the hypotube. The hypotube with the metal coating coated on the surface is a coating section, the coating section has developability, and the coating sections are arranged at equal intervals on the hypotube.

8. The micro-guide wire with a ranging function according to claim 7, characterized in that, When the developing portion has the first developing spring; There are a plurality of first developing springs, the first developing springs are arranged on the core wire at equal intervals, and the hypotube is arranged to cover the outer circumference of the first developing springs; The coating section corresponds to a setting position of the first developing spring on the core wire, and a side projection of the coating section completely covers a side projection of the first developing spring corresponding thereto.

9. The micro-guidewire with a ranging function according to claim 8, characterized in that, When the developing portion has two or more developing layers, under the same lighting environment, the developing degree of the developing layer located in the outer peripheral direction of the core wire is greater than the developing degree of the developing layer located in the inner side.

10. The micro-guidewire with ranging function according to any one of claims 1-6, characterized in that, The axial length of each developing portion is in the range of 0.5 mm to 1 mm.

Images