Micro guide wire
By designing a combined structure of distal core wire, torsion-controlled winding wire, and sheath winding wire, the problem of microguidewire passage in tortuous blood vessels was solved, improving flexibility, support, and torsion control, reducing the difficulty of vascular interventional surgery, and improving surgical efficiency.
Patent Information
- Application Number
- CN202422654583.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-10-31
AI Technical Summary
Existing microguidewires are difficult to adjust the angle when passing through tortuous blood vessels, making it difficult to pass smoothly, and they are prone to scratching blood vessels or providing insufficient support.
A microguidewire was designed, comprising a distal core wire and a torsion-controlled winding wire. The distal core wire is formed by spiraling a flat wire along the axial direction. The torsion-controlled winding wire is spirally fixed on the outer periphery of the distal core wire, with the spiral direction being opposite. The sheath winding wire is sleeved on the outside of the torsion-controlled winding wire. The design of core wire segments with different diameters and surface coatings improves flexibility, support and torsion control.
It enables the smooth passage of microguidewires through tortuous blood vessels, reduces the difficulty of operation, improves surgical efficiency, avoids problems such as blood vessel scratches and tip protrusion, and has good flexibility, pushability, torsion control and lubrication.
Smart Images
Figure CN223716188U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of interventional medical instrument, concretely relates to a micro guide wire. BACKGROUND
[0002] Interventional therapy mode mainly is medical image equipment, with the help of puncture needle, catheter, guide wire and other equipment through puncture into human body and carries specific instrument into human body pathological part and carries out minimally invasive treatment.
[0003] The micro guide wire is one of the main instruments for nerve arterial interventional diagnosis and treatment. At present, part of the medical micro guide wire is hard, the head end of the micro guide wire is not soft enough, the angle is not easy to adjust when passing through the tortuous blood vessel, the blood vessel cannot be smoothly passed through, and the blood vessel is easily scratched. Another part of the micro guide wire is too soft at the head end, the supporting force is not enough, and the tortuous blood vessel cannot be passed through. UTILITY MODEL CONTENT
[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defect that the micro guide wire is difficult to smoothly pass through the tortuous blood vessel in the prior art, so as to provide a micro guide wire.
[0005] In order to solve the above technical problems, the technical scheme of the utility model is as follows:
[0006] A micro guide wire comprises:
[0007] The core wire comprises an axial butt joint of a proximal end core wire and a distal end core wire, the radial dimension of the proximal end core wire is greater than or equal to the radial dimension of the distal end core wire; the distal end core wire comprises a flat wire, and the distal end core wire is formed by spirally winding the flat wire along the axial direction of the core wire;
[0008] The twist control wire is spirally wound on the outer periphery of the distal end core wire along the axial direction of the distal end core wire and is fixedly connected with the distal end core wire; the spiral direction of the twist control wire is opposite to the spiral direction of the distal end core wire.
[0009] Further, the length of the distal end core wire is 15mm-50mm, and the pitch of the distal end core wire is 0.02mm-2mm.
[0010] Further, the wire diameter of the twist control wire is 0.02mm-0.06mm, and the pitch of the twist control wire is 0.02mm-0.1mm.
[0011] Further, the thickness of the flat wire is 0.02mm-0.06mm; the flat wire is an equal-thickness flat wire with the same thickness, or the flat wire is a non-equal-thickness gradually changing flat wire with the thickness gradually changing between 0.02mm and 0.06mm in the axial direction from the distal end of the distal end core wire to the proximal end.
[0012] Further, the proximal core wire comprises a variable diameter core wire segment connected with the distal core wire at the distal end, the radial dimension of the variable diameter core wire segment is greater than or equal to the radial dimension of the distal core wire; the variable diameter core wire segment comprises one or more variable diameter segments with gradually increasing diameters and one or more constant diameter segments with constant diameters, the diameters of the variable diameter segments gradually increase in the axial direction from the distal end to the proximal end of the variable diameter core wire segment.
[0013] Further, the proximal core wire further comprises a push rod connected at the proximal end of the variable diameter core wire segment, the surface of the push rod is provided with a hydrophobic polytetrafluoroethylene coating, and the outer diameter of the push rod is 0.25mm-0.60mm.
[0014] Further, the outer periphery of the twist control wire is provided with a sheath wire, and the distal core wire, the twist control wire and the sheath wire are coaxially welded.
[0015] Further, the spiral direction of the sheath wire is opposite to the spiral direction of the twist control wire; the length of the sheath wire is 20mm-600mm, the wire diameter of the sheath wire is 0.02mm-0.06mm, and the pitch of the sheath wire is 0.02mm-0.1mm.
[0016] Further, the part of the micro guide wire surface without the polytetrafluoroethylene coating is coated with a hydrophilic coating.
[0017] Further, the material of the core wire is SUS304V stainless steel, or the material of the core wire is a composite of SUS304V stainless steel and nickel-titanium alloy; the material of the twist control wire is 304V stainless steel or platinum-nickel alloy or platinum-rhodium alloy; the material of the sheath wire is platinum-nickel alloy or platinum-rhodium alloy, or the material of the sheath wire is a composite of platinum-nickel alloy and stainless steel wire, or the material of the sheath wire is a composite of platinum-rhodium alloy and stainless steel wire.
[0018] The technical scheme of the utility model has the following advantages:
[0019] 1. The micro guide wire provided by the utility model, the outer diameter size of the distal end core wire is less than or equal to the outer diameter size of the proximal end core wire, so that the distal end core wire has relatively better flexibility, and the torsion control winding wire is spirally wound and fixed on the outer periphery of the distal end core wire, which can improve the supporting force of the distal end core wire to a certain extent; moreover, the distal end core wire is spirally formed by flat wires along the axial direction of the core wire, the torsion control winding wire is spirally wound on the outer periphery of the distal end core wire, and the distal end core wire and the torsion control winding wire can be bent and deformed in the radial direction, which can further improve the flexibility of the micro guide wire; finally, the head end of the micro guide wire is neither too soft nor too hard, and even if the intracranial blood vessel is curved, the micro guide wire can also smoothly reach the treatment site. In addition, the spiral directions of the distal end core wire and the torsion control winding wire are opposite, so that the micro guide wire will not be disassembled when subjected to torsion during use, and the micro guide wire has excellent torsion control performance.
[0020] 2. The micro guide wire provided by the utility model, the thickness of the flat wire gradually changes between 0.02mm and 0.06mm, which can further improve the flexibility of the distal end core wire spirally formed by the flat wire.
[0021] 3. The micro guide wire provided by the utility model, the variable diameter core wire section of the proximal end core wire adopts a structure design of multiple variable diameter sections and equal diameter sections, so that the micro guide wire has better flexibility and supporting performance.
[0022] 4. The micro guide wire provided by the utility model, the surface of the push rod is provided with a hydrophobic polytetrafluoroethylene coating, so that the micro guide wire has the smallest friction coefficient when cooperating with the instrument, and the micro guide wire has excellent push performance.
[0023] 5. The micro guide wire provided by the utility model, the sheath winding wire is sleeved outside the torsion control winding wire, and when the proximal end core wire and the torsion control winding wire are bent, the sheath winding wire is bent together with the distal end of the micro guide wire; since the strength of the sheath winding wire is greater than the strength of the proximal end core wire and the torsion control winding wire as a whole, the sheath winding wire is more likely to maintain a curved state relative to the micro guide wire as a whole during the conveying process of the micro guide wire in the human brain blood vessel, so that the sheath winding wire can assist the distal end of the micro guide wire to maintain a spiral curved state, and the problems such as the sharp end of the ordinary micro guide wire being outwardly bent can be largely avoided.
[0024] 6. The micro guide wire provided by the utility model, the spiral direction of the sheath winding wire is opposite to the spiral direction of the torsion control winding wire, so that the micro guide wire will not be disassembled when subjected to torsion during use, and the micro guide wire has excellent torsion control performance.
[0025] 7. The micro guide wire provided by the utility model, the hydrophilic coating is coated on all parts outside the polytetrafluoroethylene coating, so that the micro guide wire has excellent lubricity.
[0026] In summary, the micro guide wire has good flexibility, pushability, twist control, lubricity and supportability; the micro guide wire can smoothly pass through various detours of blood vessels, reduces the operation difficulty of the micro guide wire intervention operation, and improves the operation recanalization efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0027] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0028] Figure 1 It is an overall schematic view of the micro guide wire in the embodiment of the present application.
[0029] Figure 2 It is a partial schematic view of the micro guide wire in the embodiment of the present application.
[0030] Figure 3 It is an overall schematic view of the core wire in the embodiment of the present application.
[0031] Figure 4 It is a partial schematic view of the core wire in the embodiment of the present application.
[0032] Figure 5 It is a structural schematic view of the distal end core wire in the embodiment of the present application.
[0033] Figure 6 It is an overall structural schematic view of the distal end core wire and the twist control wire in the embodiment of the present application.
[0034] Figure 7 It is a connection relationship schematic view of the distal end core wire and the twist control wire in the embodiment of the present application.
[0035] Figure 8 It is a cross-sectional view of the micro guide wire in the embodiment of the present application.
[0036] The drawings are explained as follows: 100, core wire; 110, proximal end core wire; 111, variable diameter core wire section; 111a, variable diameter section; 111b, constant diameter section; 112, push rod; 120, distal end core wire; 200, twist control wire; 300, sheath wire. DETAILED DESCRIPTION
[0037] The technical solutions of the present application will be described clearly and completely in connection with the drawings. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.
[0038] In the description of the present application, it should be understood that the terms "proximal end" and "distal end" throughout the description refer to the proximal and distal relative to the operator. In use of the present application, the end close to the doctor or operator is the "proximal end", i.e. the end where the operator is, and the end away from the doctor or operator is the "distal end", i.e. the end where the balloon is. The above description of the orientation is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.
[0039] In the description of the present application, it should be noted that the terms "mounting", "connecting" and "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0040] As shown in Figure 1 A micro guide wire shown in Fig. 8 comprises a core wire 100, a twist control wire 200 and a sheath wire 300. The core wire 100 comprises a proximal end core wire 110 and a distal end core wire 120 which are axially connected, and the radial dimension of the proximal end core wire 110 is greater than or equal to that of the distal end core wire 120. The distal end core wire 120 comprises a flat wire, and the distal end core wire 120 is formed by spirally winding the flat wire along the axial direction of the core wire 100. The twist control wire 200 is spirally wound on the outer periphery of the distal end core wire 120 along the axial direction of the distal end core wire 120, and the twist control wire 200 is fixedly connected with the distal end core wire 120. The spiral direction of the twist control wire 200 is opposite to that of the distal end core wire 120. The sheath wire 300 is fixedly sleeved on the outer periphery of the twist control wire 200, and the distal end core wire 120, the twist control wire 200 and the sheath wire 300 are coaxially welded.
[0041] Specifically, the material of the core wire 100 is SUS304V stainless steel, or the material of the core wire 100 is a winding composite of SUS304V stainless steel and nickel-titanium alloy. The length of the distal core wire 120 is 15mm-50mm, and the pitch of the distal core wire 120 is 0.02mm-2mm; the thickness of the flat wire ranges from 0.02mm to 0.06mm. The material of the twist control winding 200 is 304V stainless steel or platinum-nickel alloy or platinum-rhodium alloy; the wire diameter of the twist control winding 200 is 0.02mm-0.06mm, and the pitch of the twist control winding 200 is 0.02mm-0.1mm. The material of the sheath winding 300 is platinum-nickel alloy or platinum-rhodium alloy, or the material of the sheath winding 300 is a winding composite of platinum-nickel alloy and stainless steel, or the material of the sheath winding 300 is a winding composite of platinum-rhodium alloy and stainless steel; the length of the sheath winding 300 is 20mm-600mm, the wire diameter of the sheath winding 300 is 0.02mm-0.06mm, and the pitch of the sheath winding 300 is 0.02mm-0.1mm.
[0042] The micro guide wire for interventional blood vessels has an outer diameter of the distal core wire 120 that is smaller than or equal to the outer diameter of the proximal core wire 110, so that the distal core wire 120 has relatively good flexibility, and the twist control winding 200 is spirally wound around the outer periphery of the distal core wire 120, which can improve the support force of the distal core wire 120 to a certain extent. The distal core wire 120 is spirally wound by the flat wire along the axial direction of the core wire 100, the twist control winding 200 is spirally wound around the outer periphery of the distal core wire 120, and the sheath winding 300 is fixedly sleeved outside the twist control winding 200. When the micro guide wire is bent, the distal core wire 120 and the twist control winding 200 can be bent and deformed in the radial direction as a whole, and the sheath winding 300 can also be bent, thereby improving the flexibility of the micro guide wire. Finally, the head end of the micro guide wire is neither too soft nor too hard, and the micro guide wire can smoothly reach the treatment site even in the case of intracranial blood vessel bending. Moreover, the strength of the sheath winding 300 is usually greater than the strength of the proximal core wire 110 and the twist control winding 200 as a whole, so that the sheath winding 300 is more likely to maintain a curved state relative to the micro guide wire as a whole during the delivery of the micro guide wire in the human brain blood vessels. Therefore, the sheath winding 300 can assist the distal end of the micro guide wire to maintain a spiral curved state and prevent the micro guide wire from having problems such as a sharp end tilting outward.
[0043] In the present embodiment, the spiral direction of the twist control winding 200 is opposite to the spiral direction of the distal core wire 120, and the spiral direction of the sheath winding 300 is opposite to the spiral direction of the twist control winding 200. In this way, the micro guide wire will not be disassembled when subjected to a torsional force during use, and the micro guide wire has excellent twist control performance.
[0044] In the embodiment, the direction perpendicular to the helical surface of the distal core wire 120 is the thickness direction of the flat wire, and the flat wire is an equal-thickness flat wire with the same thickness. In alternative embodiments, in the axial direction from the distal end of the distal core wire 120 to the proximal end, the flat wire is a non-equal-thickness flat wire with a thickness gradually changing between 0.02 mm and 0.06 mm. The structure of the flat wire with a gradually changing thickness can further improve the flexibility of the distal core wire 120 formed by the helix of the flat wire.
[0045] In the embodiment, the proximal core wire 110 includes a variable-diameter core wire segment 111 and a push rod 112. The distal end of the variable-diameter core wire segment 111 is connected to the distal core wire 120, and the proximal end of the variable-diameter core wire segment 111 is connected to the push rod 112. The radial dimension of the variable-diameter core wire segment 111 is greater than or equal to the radial dimension of the distal core wire 120. The variable-diameter core wire segment 111 includes one or more variable-diameter segments 111a with a gradually changing diameter and one or more constant-diameter segments 111b with a constant diameter. In the axial direction from the distal end of the variable-diameter core wire segment 111 to the proximal end, the diameter of the variable-diameter segments 111a gradually increases. The structure of the variable-diameter core wire segment 111 of the proximal core wire 110 with multiple variable-diameter segments 111a and constant-diameter segments 111b enables the micro guide wire to have excellent flexibility and support.
[0046] In the embodiment, the outer diameter of the push rod 112 is 0.25 mm to 0.60 mm. The surface of the push rod 112 is provided with a hydrophobic polytetrafluoroethylene coating. The push rod 112 with the polytetrafluoroethylene coating has the smallest friction coefficient when cooperating with the instrument, so that the micro guide wire has excellent pushability. The portions of the micro guide wire without the polytetrafluoroethylene coating are coated with a hydrophilic coating, which enables the micro guide wire to have excellent lubricity.
[0047] In summary, the micro guide wire provided by the utility model has good flexibility, pushability, twist control, lubricity, and support. The micro guide wire can smoothly pass through various winding blood vessels, reduce the operation difficulty of the micro guide wire intervention surgery, and improve the recanalization efficiency of the surgery.
[0048] Obviously, the above embodiments are merely examples for clear illustration, and are not intended to limit the embodiments. Based on the above description, those skilled in the art can make other different forms of changes or modifications. Here, it is not necessary or possible to exhaust all the embodiments. The obvious changes or modifications derived therefrom are still within the protection scope of the utility model.
Claims
1. A microguidewire, characterized in that, include: The core wire (100) includes a proximal core wire (110) and a distal core wire (120) that are axially joined together; the outer diameter of the proximal core wire (110) is greater than or equal to the outer diameter of the distal core wire (120); the distal core wire (120) includes a flat wire, which is formed by spiraling the flat wire along the axial direction of the core wire (100); The twisted winding (200) is spirally wound around the outer periphery of the distal core wire (120) along the axial direction and is fixedly connected to the distal core wire (120); the spiral direction of the twisted winding (200) is opposite to that of the distal core wire (120).
2. The microguidewire according to claim 1, characterized in that, The length of the distal core wire (120) is 15mm to 50mm, and the pitch of the distal core wire (120) is 0.02mm to 2mm.
3. The microguidewire according to claim 2, characterized in that, The diameter of the twist-controlled winding wire (200) is 0.02mm~0.06mm, and the pitch of the twist-controlled winding wire (200) is 0.02mm~0.1mm.
4. The microguidewire according to claim 1, characterized in that, The thickness of the flat wire ranges from 0.02mm to 0.06mm; the flat wire is a straight flat wire of uniform thickness, or a non-uniform thickness gradient flat wire with a thickness that gradually changes between 0.02mm and 0.06mm in the axial direction from the distal end of the distal core wire (120) to the proximal end.
5. The microguidewire according to claim 1, characterized in that, The proximal core wire (110) includes a variable diameter core wire segment (111) connected to the distal core wire (120) at its distal end. The radial dimension of the variable diameter core wire segment (111) is greater than or equal to the radial dimension of the distal core wire (120). The variable diameter core wire segment (111) includes one or more variable diameter segments (111a) with gradually changing diameters and one or more constant diameter segments (111b) with unchanged diameters. In the axial direction from the distal end to the proximal end of the variable diameter core wire segment (111), the diameter of the variable diameter segment (111a) gradually increases.
6. The microguidewire according to claim 5, characterized in that, The proximal core wire (110) also includes a push rod (112) connected to the proximal end of the variable diameter core wire segment (111), and the surface of the push rod (112) is provided with a hydrophobic polytetrafluoroethylene coating.
7. The microguidewire according to any one of claims 1-6, characterized in that, The outer periphery of the twist-controlled winding wire (200) is provided with a sheath winding wire (300), the diameter of the sheath winding wire (300) is 0.02mm~0.06mm, and the pitch of the sheath winding wire (300) is 0.02mm~0.1mm.
8. The microguidewire according to claim 7, characterized in that, The distal core wire (120), the torsion-controlled winding wire (200), and the sheath winding wire (300) are coaxially welded together, and the spiral direction of the sheath winding wire (300) is opposite to that of the torsion-controlled winding wire (200).
9. The microguidewire according to claim 7, characterized in that, The portions of the microguidewire surface that are not coated with polytetrafluoroethylene are coated with a hydrophilic coating.
10. The microguidewire according to claim 7, characterized in that, The core wire (100) is made of SUS304V stainless steel, or the core wire (100) is made of a composite of SUS304V stainless steel and nickel-titanium alloy; the torsion-controlled winding wire (200) is made of 304V stainless steel, platinum-nickel alloy, or platinum-rhenium alloy; the sheath winding wire (300) is made of platinum-nickel alloy or platinum-rhenium alloy, or the sheath winding wire (300) is made of a composite of platinum-nickel alloy and stainless steel, or the sheath winding wire (300) is made of a composite of platinum-rhenium alloy and stainless steel.