Nerve intervention blood vessel guide wire

Abstract

The nerve intervention blood vessel guide wire comprises a core wire and a guide wire sleeve, the guide wire sleeve is arranged on the core wire in a penetrating mode, the guide wire sleeve comprises a spring winding structure and a sleeving pipe, the spring winding structure is located at the far end of the sleeving pipe and fixedly connected with the sleeving pipe, the sleeving pipe is made of a metal material, and a groove structure is formed in the sleeving pipe; and the groove structures are spirally distributed in the axial direction of the core wire. The guide wire of the groove structure is arranged at the near end of the core wire structure, the torque of the near end can be transmitted to the spring winding structure located at the far end of the core wire in an equal ratio mode by means of the pipe body characteristic of the groove structure, and the situation that due to the resistance effect of a tubular structure with a groove on shaping, the shaping maintaining capacity is weak is well avoided. The spring winding structure is arranged at the far end of the core wire and has the advantages that the head end is soft and easy to plasticity, and the defect that the torque of the spring winding structure cannot be transmitted to the far end in an equal proportion at the near end is overcome, so that the limitation that an operator cannot flexibly control the guide wire is avoided.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and particularly to a neurointerventional vascular guide wire. Background Art

[0002] Intracranial vascular diseases are becoming increasingly common due to factors such as age and genetics. Taking aneurysms as an example, intracranial aneurysms will compress nerve tissues before rupture, and aneurysms in different positions will cause corresponding pathological symptoms. For example, compression of the optic nerve will cause dark shadows in the visual field and even blindness in severe cases. Subarachnoid hemorrhage caused by aneurysm rupture will trigger stroke. Currently, the treatment methods for intracranial aneurysms are divided into surgical clipping and interventional treatment. Considering the slow healing of elderly patients after craniotomy, interventional treatment methods are often used. Interventional treatment devices are further divided into auxiliary stent-assisted coil embolization, flow diversion device treatment, fabric embolization, etc. The guide wire is used to deliver such devices to the lesion location to achieve the treatment purpose.

[0003] Currently, the mainstream guide wire structure is an alloy core wire plus a coiled spring structure or an alloy core wire plus an alloy tube with a groove structure. Each of the two guide wires has its own advantages and disadvantages.

[0004] The coiled spring structure guide wire will have the defect that the proximal torque cannot be transmitted to the distal end in equal proportion during clinical use, so that the guide wire cannot be manipulated flexibly, but the tip is soft and easy to shape.

[0005] The groove structure guide wire can transmit the proximal torque to the distal end in equal proportion by using the characteristics of its tube body, but the alloy tube structure itself has a resistance to shaping and a weak shaping retention ability. Summary of the Invention

[0006] In view of this, this application proposes a neurointerventional vascular guide wire, including a core wire and a guide wire sleeve; the guide wire sleeve is sleeved on the core wire, and the guide wire sleeve includes a coiled spring structure and a sleeve tube; the coiled spring structure is located at the distal end of the sleeve tube, and the coiled spring structure is fixedly connected to the sleeve tube; the sleeve tube is made of metal, and a groove structure is provided on the sleeve tube; the groove structure is spirally arranged axially on the core wire.

[0007] In a possible implementation manner, the coiled spring structure is a variable-diameter coiled spring, including a large-diameter section and a small-diameter section; the small-diameter section is located at the proximal end of the large-diameter section, and the diameter of the small-diameter section is smaller than that of the large-diameter section. The small-diameter section can extend into the interior of the sleeve tube from the distal end of the sleeve tube.

[0008] In a possible implementation manner, the diameter of the sleeve tube is equal to the diameter of the large-diameter section; the small-diameter section is a straight section with a constant diameter, or the small-diameter section is a tapered section with a diameter gradually decreasing from the distal end to the proximal end of the core wire.

[0009] In a possible implementation, the ratio of the axial length of the spring winding structure to the axial length of the sleeve tube is from 1:18 to 1:3.

[0010] In a possible implementation, the groove structures are symmetrically distributed at the same position in the axial direction of the sleeve tube.

[0011] In a possible implementation, the groove structure includes an odd groove group and an even groove group; the odd positions in the direction from the distal end to the proximal end of the sleeve tube are the odd groove group, and the even positions in the direction from the distal end to the proximal end of the sleeve tube are the even groove group; there is a first preset deflection angle between the odd groove group and the adjacent even groove group; there is a second preset deflection angle between two adjacent odd groove groups; the angles of the first preset deflection angle and the second preset deflection angle are equal.

[0012] In a possible implementation, the depth of the groove structure is less than the radius of the sleeve tube; the groove structure becomes sparser in the direction from the distal end to the proximal end of the sleeve tube.

[0013] In a possible implementation, the spring winding structure is made of a radiopaque material.

[0014] In a possible implementation, the distal end of the guide wire sleeve is coated with a hydrophilic coating.

[0015] In a possible implementation, the spring winding structure is fixed to the sleeve tube by bonding or welding.

[0016] Advantages of the present application: Since the intracranial blood vessels are relatively thin and have many curved segments, the present application proposes a neurointerventional vascular guide wire: a combined structure of a spring winding structure + a circular tube groove structure, thus integrating the advantages of the two structures into a new guide wire design. Combining the characteristics of the spring winding structure with the characteristics of the metal tubular structure, taking into account the advantages of two different types of guide wires. That is, this guide wire enables the operator to be more proficient in super-selecting branch blood vessels, quickly establish a blood vessel access, and shorten the operation time.

[0017] Furthermore, the groove structure guide wire is arranged at the proximal end of the core wire structure. By utilizing the tube body characteristics of the groove structure, the proximal torque can be transmitted to the spring winding structure located at the distal end of the core wire in equal proportion, and it can better avoid the resistance to shaping of the tubular structure with grooves itself and the characteristic of weak shaping retention ability. The spring winding structure is arranged at the distal end of the core wire, having the characteristics of softness and easy plasticity at the head end, and avoiding the defect that when the spring winding structure is at the proximal end, the torque cannot be transmitted to the distal end in equal proportion, resulting in the limitation that the operator cannot flexibly control the guide wire.

[0018] According to the following detailed description of the exemplary embodiments with reference to the accompanying drawings, other features and aspects of the present application will become clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings included in and constituting a part of the specification, together with the specification, illustrate exemplary embodiments, features, and aspects of the present application and are used to explain the principles of the present application.

[0020] Figure 1 Schematic side view of a neurointerventional vascular guide wire showing an embodiment of the present application;

[0021] Figure 2 Schematic side view of a coil spring structure showing an embodiment of the present application;

[0022] Figure 3 Schematic side view of a sleeve showing an embodiment of the present application;

[0023] Figure 4 Partial enlarged view of a groove structure showing an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Various exemplary embodiments, features, and aspects of the present application will be described in detail below with reference to the drawings. The same reference numerals in the drawings denote elements having the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings do not have to be drawn to scale unless otherwise specified.

[0025] It should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application.

[0026] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0027] The special term "exemplary" herein means "serving as an example, embodiment, or illustration". Any embodiment described herein as "exemplary" should not necessarily be construed as superior to or better than other embodiments.

[0028] In addition, for better illustration of the present application, numerous specific details are provided in the following detailed implementation manners. Those skilled in the art should understand that the present application can still be implemented without some specific details. In some instances, methods, means, elements, and circuits well-known to those skilled in the art are not described in detail so as to highlight the gist of the present application.

[0029] As Figures 1 - 4 shown, the neurointerventional vascular guidewire includes a core wire 20 and a guidewire sleeve. The guidewire sleeve is sleeved on the core wire 20. The guidewire sleeve includes a helical spring structure 11 and a sleeve pipe 12. The helical spring structure 11 is located at the distal end of the sleeve pipe 12, and the helical spring structure 11 is fixedly connected to the sleeve pipe 12. The sleeve pipe 12 is made of metal, and a groove structure is formed on the sleeve pipe 12, and the groove structure is spirally distributed along the axial direction of the core wire 20.

[0030] In this embodiment, the neurointerventional vascular guidewire of the present application is mainly applied to the establishment of a passage during the neurointerventional treatment process to assist the microcatheter and the stent to reach the lesion location. Specifically, since the intracranial blood vessels are relatively thin and have many curved segments, the present application proposes a neurointerventional vascular guidewire: a combined structure of a helical spring structure 11 + a circular tube groove structure, thus integrating the advantages of the two structures into a new guidewire design. Combining the characteristics of the helical spring structure 11 with the characteristics of the metal tubular structure, taking into account the advantages of two different types of guidewires. That is, this guidewire enables the operator to be more proficient in super-selecting branch blood vessels, quickly build a blood vessel passage, and shorten the operation time.

[0031] Furthermore, the grooved structure guidewire is arranged at the proximal end of the core wire 20 structure. By utilizing the tube body characteristics of the grooved structure, the proximal torque can be transmitted to the helical spring structure 11 located at the distal end of the core wire 20 in an equal ratio, and it preferably avoids the characteristics that the tubular structure of the grooved structure itself has resistance to shaping and weak shaping retention ability. The helical spring structure 11 is arranged at the distal end of the core wire 20, having the characteristics of soft and easy plasticity at the head end, and avoiding the defect that the torque of the helical spring structure 11 at the proximal end cannot be transmitted to the distal end in an equal ratio, resulting in the limitation that the operator cannot flexibly control the guidewire.

[0032] In one specific embodiment, the distal end of the helical spring structure 11 is an arc structure.

[0033] In one specific embodiment, the helical spring structure 11 is a variable-diameter helical spring, including a large-diameter section 111 and a small-diameter section 112. The small-diameter section 112 is located at the proximal end of the large-diameter section 111, and the diameter of the small-diameter section 112 is smaller than that of the large-diameter section 111. The small-diameter section 112 can extend into the interior of the sleeve pipe 12 from the distal end of the sleeve pipe 12.

[0034] In this embodiment, the helical spring structure 11 is a variable-diameter helical spring, and the small-diameter section 112 can be a conical spring.

[0035] In one specific embodiment, the diameter of the sleeve tube 12 is equal to the diameter of the large-diameter section 111, the small-diameter section 112 is a straight section with a constant diameter, or the small-diameter section 112 is a tapered section with a diameter gradually decreasing from the distal end to the proximal end of the core wire 20.

[0036] In this embodiment, the small-diameter section 112 is mainly used to extend from the distal end of the sleeve tube 12 into the inner wall of the sleeve tube 12, so as to increase the contact area of the connection part between the spring winding structure 11 and the sleeve tube 12, so that the neurointerventional vascular guide wire of the present application has better structural strength.

[0037] In one specific embodiment, the ratio of the axial length of the spring winding structure 11 to the axial length of the sleeve tube 12 is 1:18 to 1:3.

[0038] In one specific embodiment, the groove structures are symmetrically distributed at the same axial position of the sleeve tube 12.

[0039] In one specific embodiment, the groove structure includes an odd groove group and an even groove group. The odd positions of the sleeve tube 12 from the distal end to the proximal end are the odd groove group, and the even positions of the sleeve tube 12 from the distal end to the proximal end are the even groove group. There is a first preset deflection angle A between the odd groove group and its adjacent even groove group, and there is a second preset deflection angle B between two adjacent odd groove groups. The angle of the first preset deflection angle A is equal to the angle of the second preset deflection angle B.

[0040] For example, setting the digital positions of the sleeve tube 12 from the distal end to the proximal end of the core wire 20, the first groove 121 (odd groove group) and the second groove group 122 (even groove group) form a first preset deflection angle A, and the first groove group 121 (odd groove group) and the third groove group 123 (odd groove group) form an angle B.

[0041] Furthermore, the angle change rule of the groove structure, that is, the angles A and B can be the same or different.

[0042] In one specific embodiment, the groove depth of the groove structure is less than the radius of the sleeve tube 12, that is, the groove depth of the groove structure can vary from 0 to not exceeding the radius of the metal round tube, and the groove structure becomes sparser from the distal end to the proximal end of the sleeve tube 12.

[0043] In one specific embodiment, the spring winding structure 11 is made of a radiopaque material.

[0044] In this embodiment, the material of the spring winding structure 11 is a noble metal material. The spring winding structure 11 can be made of materials such as gold, silver, platinum iridium, and platinum tungsten.

[0045] In one specific embodiment, the distal end of the guide wire sleeve is coated with a hydrophilic coating.

[0046] In one specific embodiment, the spring winding structure 11 and the sleeve pipe 12 are fixed by bonding or welding.

[0047] In this embodiment, preferably, the connection mode between the spring winding structure 11 and the sleeve pipe 12 is a stable structure formed by nesting and glue bonding.

[0048] Specifically, the processing method of the groove structure can be laser cutting, micro tool cutting, wire cutting, chemical corrosion, etc.

[0049] This guide wire sleeve is composed of a spring winding structure 11 and a sleeve pipe 12. The softness of the head end is directly related to the pitch of the spring winding structure 11 and the design of the variable diameter mandrel structure. The overall softness distribution of the guide wire is directly related to the size of the variable diameter mandrel and the metal tube structure. The softness of the metal tube is controlled by designing the width, depth and distance between the grooves on the metal tube. The overall mechanical properties of the metal tube lie in the distribution law of the groove structure 11, that is, the setting of angle A and angle B.

[0050] Preferably, the angles of the first preset deflection angle A and the second preset deflection angle B are the same, and the first preset deflection angle is 90°.

[0051] The embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications or improvements to the technologies in the market, or to enable other ordinary skilled persons in the technical field to understand the embodiments disclosed herein.

Claims

1. A neurointerventional vascular guide wire, characterized in that, It includes a core wire and a guide wire sleeve; The guide wire sleeve is sleeved on the core wire, and the guide wire sleeve includes a helical spring structure and a sleeve pipe; The helical spring structure is located at the distal end of the sleeve pipe, and the helical spring structure is fixedly connected to the sleeve pipe; The sleeve pipe is made of a metal material, and a groove structure is formed on the sleeve pipe, and the groove structure is spirally arranged axially on the core wire.

2. The neurointerventional vascular guide wire according to claim 1, characterized in that, The helical spring structure is a variable-diameter helical spring, including a large-diameter section and a small-diameter section; The small-diameter section is located at the proximal end of the large-diameter section, and the diameter of the small-diameter section is smaller than that of the large-diameter section. The small-diameter section can extend into the interior of the sleeve pipe from the distal end of the sleeve pipe.

3. The neurointerventional vascular guide wire according to claim 2, characterized in that, The diameter of the sleeve pipe is equal to the diameter of the large-diameter section; The small-diameter section is a straight section with a constant diameter, or the small-diameter section is a tapered section with a diameter gradually decreasing from the distal end to the proximal end of the core wire.

4. The neurointerventional vascular guide wire according to claim 1, wherein The ratio of the axial length of the helical spring structure to the axial length of the sleeve pipe is 1:18 to 1:

3.

5. The neurointerventional vascular guide wire according to claim 1, characterized in that, The groove structures are symmetrically distributed at the same position axially on the sleeve pipe.

6. The neurointerventional vascular guide wire according to claim 1, wherein The groove structure includes an odd-numbered groove group and an even-numbered groove group; The odd-numbered positions of the sleeve pipe from the distal end to the proximal end are the odd-numbered groove group, and the even-numbered positions of the sleeve pipe from the distal end to the proximal end are the even-numbered groove group; There is a first preset deflection angle between the odd-numbered groove group and the adjacent even-numbered groove group; There is a second preset deflection angle between two adjacent odd-numbered groove groups; The angle of the first preset deflection angle is equal to the angle of the second preset deflection angle.

7. The neurointerventional vascular guide wire according to any one of claims 1-6, characterized in that, The depth of the groove structure is less than the radius of the sleeve pipe; The groove structure becomes sparser from the distal end to the proximal end of the sleeve pipe.

8. The neurointerventional vascular guide wire according to any one of claims 1-6, characterized in that, The helical spring structure is made of a radiopaque material.

9. The neurointerventional vascular guide wire according to any one of claims 1-6, characterized in that, The distal end of the guide wire sleeve is coated with a hydrophilic coating.

10. The neurointerventional vascular guide wire according to any one of claims 1-6, characterized in that, The helical spring structure is fixedly connected to the sleeve pipe by bonding or welding.

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