CN115554576A - Micro-guide wire protection tube and micro-guide wire assembly - Google Patents

Abstract

The invention provides a micro guide wire protection tube and a micro guide wire assembly, and relates to the field of medical instruments, wherein the micro guide wire protection tube comprises a shaping tube section and a main body tube section; the shaping pipe section is of a spiral structure; the proximal end of the shaping pipe section is connected with the distal end of the main body pipe section; the extending direction of the central axis of the shaping pipe section is used as the axial direction: the main body pipe section comprises at least two sections of sub pipe sections which are arranged and connected along the axial direction; each sub-pipe section comprises a plurality of connecting rings and connecting rod groups respectively; the connecting rings are arranged at intervals along the axial direction, the central axis extends along the same direction, two adjacent connecting rings are connected through a connecting rod group respectively, each connecting rod group comprises at least two connecting rods respectively, the radial circumferential direction of the connecting rings is taken as the circumferential direction, and the connecting rods in each connecting rod group are arranged at intervals along the circumferential direction. The invention relieves the defects of the existing micro guide wire protection tube that: the straight head structure and the elbow structure are respectively defined, so that the production cost is high and the use by operators is not facilitated; the technical problem that the smoothness and the bending performance of the micro guide wire protective tube with a single straight head or elbow structure cannot be achieved simultaneously.

Description

Micro-guide wire protection tube and micro-guide wire assembly

Technical Field

The invention relates to the technical field of medical instruments, in particular to a micro guide wire protection tube and a micro guide wire assembly.

Background

In the surgical clinical operation process of cardiovascular and cerebrovascular diseases, especially capillary blood vessels, a precise nerve micro-guide wire component with a thinner diameter is often used, and the distal end of the micro-guide wire component extends into the lesion position in the blood vessel, so that a more effective and concise method is provided for the treatment operation scheme adopted by an operator.

The existing micro guide wire assembly mainly comprises a core wire, a spring and a protection tube; the core wire can be made of stainless steel wires, nickel-titanium alloy wires and other metals or formed by connecting the stainless steel wires and the nickel-titanium alloy wires in a certain mode; the spring is typically wound from a developable wire and the protective tube is made from stainless steel or nitinol. The head end structure of the micro guide wire protection tube is generally divided into a straight head structure and an elbow structure, the two structures have respective advantages, the straight head structure is more applicable to blood vessels with less branches due to better smoothness, and the elbow structure can be used for adjusting the direction of the elbow to enter the bent complex blood vessel.

The existing micro guide wire protection tube at least has the following problems: the straight head structure and the elbow structure are respectively defined, so that the specification of the micro guide wire protection tube is various, the production cost is high, and the micro guide wire protection tube is not beneficial to operators to use; the smooth and bending properties of the micro guide wire protection tube of a single straight-head structure or an elbow structure can not be achieved at the same time, and the micro guide wire protection tube in the prior art is made of stainless steel or nickel-titanium alloy, so that the stainless steel is poor in flexibility and easy to deform, and the nickel-titanium alloy has superelasticity and is difficult to shape, so that the solution mode that the bent structure is formed by plastic during use by producing the straight-head structure is not feasible.

The micro guide wire protection tube which can give consideration to both the smoothness and the bending property is urgently needed to be provided so as to relieve the technical problems caused by two structures of the straight head and the elbow of the existing micro guide wire protection tube.

Disclosure of Invention

The invention aims to provide a micro guide wire protection tube and a micro guide wire, which are used for relieving the technical problems caused by two structures of a straight head and an elbow of the existing micro guide wire protection tube.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

in a first aspect, an embodiment of the present invention provides a micro guidewire protection tube, including a shaping tube segment and a main body tube segment;

the shaping pipe section is of a spiral structure;

a proximal end of the shaping tube segment is connected to a distal end of the body tube segment; taking the extension direction of the central axis of the shaping pipe section as the axial direction: the main body pipe section comprises at least two sections of sub pipe sections which are arranged along the axial direction and are mutually connected;

each sub-pipe section comprises a plurality of connecting rings and a plurality of connecting rod groups; the connecting rings are arranged at intervals in the axial direction, the central axes of the connecting rings extend in the same direction, every two adjacent connecting rings are connected together through a connecting rod group, each connecting rod group comprises at least two connecting rods, the radial circumferential direction of the connecting rings is taken as the circumferential direction, and the at least two connecting rods in each connecting rod group are arranged at intervals in the circumferential direction.

According to the embodiment, the shaping pipe section and the main body pipe section are combined with each other, so that the micro guide wire protection pipe which is good in pushing performance and flexibility and has the plasticity at the head end is obtained, the micro guide wire protection pipe can adapt to most of blood vessels in a human body, the smoothness and the flexibility are both considered, and the micro guide wire protection pipe can enter the blood vessels more easily to find the pathological change direction and is pushed to the pathological change position; the multiple specifications of the micro guide wire protection tube can be avoided, the production cost is reduced, and the more specific structure and principle description is shown in the specific embodiment part of the specification.

In an alternative implementation manner of this embodiment, it is preferable that, when the length of each connecting ring or connecting rod in the extending direction of the central axis of each connecting ring in the respective sub-pipe section is a respective width, and the length of each connecting ring or connecting rod in the radial direction of each connecting ring in the respective sub-pipe section is a respective height, then: in the same sub-pipe section, the width and the height of any two connecting rings are the same, and the width and the height of any two connecting rods are the same; and the width of each connecting ring in the sub-pipe section positioned at the proximal end side in two axially adjacent sub-pipe sections is B₁₁ Each connecting rod has a width of B₂₁ Each connecting rod has a height of H₁ The width of each connecting ring in the sub-tube section at the far end side is B₁₂ Each connecting rod has a width of B₂₂ Each connecting rod has a height of H₂ And then: b is₁₁ >B₁₂ ，B₂₁ =B₂₂ ，H₁ >H₂ 。

Further preferably, in two adjacent segments of the sub-segments, B₁₁ -B₁₂ Not less than 0.010mm; and/or, H₁ -H₂ ≥0.015mm。

In an alternative implementation manner of this embodiment, it is preferable that, when the length of each connecting ring or connecting rod in the extending direction of the central axis of each connecting ring in the respective sub-pipe section is a respective width, and the length of each connecting ring or connecting rod in the radial direction of each connecting ring in the respective sub-pipe section is a respective height, then: in the integral structure of the main body pipe section: the width of each connecting ring is respectively more than or equal to 0.040mm and less than or equal to 0.100mm; and/or the width of each connecting rod is more than or equal to 0.030mm and less than or equal to 0.050mm; and/or the height of each connecting rod is more than or equal to 0.060mm and less than or equal to 0.150mm.

In an optional implementation manner of this embodiment, it is preferable that, in the overall structure of the main body pipe segment, in every two adjacent connecting rod groups, the connecting rods in the connecting rod group on the proximal side and the connecting rods in the connecting rod group on the distal side are staggered in the circumferential direction; in the same sub-pipe section, the connecting rods are arranged in a spiral trend.

In an optional implementation manner of this embodiment, it is preferable that, in the same connecting rod group, the at least two connecting rods are arranged at equal intervals in the circumferential direction.

In an alternative embodiment of this embodiment, it is preferable that, in the same sub-pipe section, an included angle between the central axis of each of the connection rings and the axial direction is greater than or equal to 0 ° and less than or equal to 30 °.

In an optional implementation manner of this embodiment, preferably, the pitch of the shaped pipe segment is greater than or equal to 0.120mm and less than or equal to 0.160mm; and/or the axial length of the shaping pipe section is more than or equal to 10mm and less than or equal to 15mm.

In an optional implementation manner of this embodiment, it is preferable that the shaping pipe segment and the main body pipe segment are respectively formed by integrally forming a metal pipe by laser cutting and then fixedly connecting; or the shaping pipe section and the main body pipe section are formed by integrally forming the same metal pipe through laser cutting.

In a second aspect, embodiments of the present invention provide a micro guidewire assembly including the micro guidewire protection tube of any one of the previous embodiments.

Because the micro guide wire assembly provided by the embodiment of the invention comprises the micro guide wire protection tube provided by the first aspect, the micro guide wire assembly provided by the embodiment of the invention can achieve all the beneficial effects which can be achieved by the micro guide wire protection tube provided by the first aspect.

In particular, in the context of the present invention, the above "and/or" means "and/or" the preceding structure is provided simultaneously or alternatively to "and/or" the following structure.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic overall structural diagram of a first alternative implementation of a micro guidewire protection tube provided by an embodiment of the invention;

fig. 2 is a partial structure enlarged view of a part a in the micro guide wire protection tube shown in fig. 1;

fig. 3 is a schematic overall structure diagram of the micro-guidewire protection tube shown in fig. 1 in a state that the main body tube section is unfolded;

fig. 4 is a partial structure enlarged view of a portion B in the micro guide wire protection tube shown in fig. 3;

fig. 5 is an overall structural diagram of a second alternative embodiment of the micro-guidewire protection tube provided by the embodiment of the invention;

fig. 6 is a partial structure enlarged view of a portion C in the micro guide wire protection tube shown in fig. 5;

fig. 7 is another alternative arrangement of the body tube segment connection ring in the micro guide wire protection tube according to the embodiment of the present invention;

fig. 8 is a layout of a connecting ring of a main body tube segment in the micro guide wire protection tube according to another alternative structure of the embodiment of the invention.

Icon: 1-shaping a pipe section; 2-a main body pipe section; 21-a first sub-section; 22-a second sub-section; 23-a third sub-section; 24-a fourth sub-section; 25-a fifth sub-section; 201-connecting ring; 202-connecting rod.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "proximal", "distal", "front", "rear", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention conventionally place when in use, and are used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.

In particular, in the present invention, the term "proximal end" refers to the end (the front end of the medical device) of the micro-guidewire protection tube provided in this embodiment that is closer to the heart of the patient after being implanted into the patient, and is denoted by the letter "J" in the drawings of the present specification, and the term "distal end" refers to the other end (the rear end of the medical device) opposite to the "proximal end", and is denoted by the letter "Y" in the drawings of the present specification; the "shaping" of the present application means that an operator simply bends the distal end of the protective tube and keeps it in a bent shape before using the micro-guide wire protective tube; in the present invention, the term "axial" refers to the direction in which the central axis of the shaped tube section extends.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Example one

The present embodiment provides a micro guidewire protection tube, referring to fig. 1 to 6, the micro guidewire protection tube comprises ashaping tube section 1 and a mainbody tube section 2; specifically, theshaping pipe section 1 has a spiral structure; the proximal end of theshaping pipe section 1 is connected with the distal end of the mainbody pipe section 2; the extension direction of the central axis of theshaping pipe section 1 is used as the axial direction: the mainbody pipe section 2 comprises at least two sections of sub pipe sections which are arranged along the axial direction and are mutually connected; each section of sub-pipe section comprises a plurality of connectingrings 201 and a plurality of connectingrod 202 groups; the connectingrings 201 are arranged at intervals in the axial direction, the central axes of the connectingrings 201 extend in the same direction, every two adjacent connectingrings 201 are connected together through a connectingrod 202 group, each connectingrod 202 group comprises at least two connectingrods 202 respectively, the radial circumferential direction of the connectingrings 201 is taken as the circumferential direction, at least two connectingrods 202 in each connectingrod 202 group are arranged at intervals in the circumferential direction, each connectingring 201 can be a circular ring, and can also be formed by connecting a plurality of S-shaped unit bodies as shown in fig. 7, or can be formed by connecting a plurality of V-shaped unit bodies as shown in fig. 8.

The sub-segments preferably include afirst sub-segment 21, asecond sub-segment 22, athird sub-segment 23, afourth sub-segment 24 and afifth sub-segment 25 arranged in sequence from the distal end to the proximal end, as shown in fig. 1 to 6.

In the embodiment, theshaping pipe section 1 and the mainbody pipe section 2 are respectively formed by fixedly connecting metal pipes after being integrally formed by laser cutting; or the moldedpipe section 1 and the mainbody pipe section 2 are formed by integrally forming the same metal pipe through laser cutting, the specific mode of laser cutting of the moldedpipe section 1 is cutting along a spiral line, and after the moldedpipe section 1 and the mainbody pipe section 2 are respectively cut through laser, surface residues are preferably removed through an acid washing mode to improve the surface smoothness. The material of theshaped tube segment 1 and the mainbody tube segment 2 can be selected from metals such as stainless steel, cobalt-based alloy, nickel-titanium alloy, and the like, and preferably the metal with super elastic property, such as nickel-titanium alloy, and the like.

The spiral structure of theplastic pipe section 1 ensures that the head end of the micro guide wire protection tube has plasticity, when the blood vessel branches are few or the blood vessel is not bent very much, theplastic pipe section 1 can keep straight to reach the position of pathological changes, when the blood vessel branches are more or the blood vessel is bent, theplastic pipe section 1 can be molded, theplastic pipe section 1 becomes a bent shape, and through experimental comparison, the spiral structure adopted by theplastic pipe section 1 has simple structure, large flexibility and no limitation of materials, even if the plastic pipe section is made of a metal with superelasticity such as nickel-titanium alloy, the plastic pipe section has good plasticity, and the molded shape can be kept unchanged; simultaneously, compare with direct the holistic distal end of straight tube shape protection tube of having now and carry out the bending moulding, avoided to a certain extent because of moulding leads to the condition that the holistic distal end of protection tube is cracked. As for the mainbody pipe section 2, because the main body pipe section comprises at least two sections of pipe sections which are arranged along the axial direction and are mutually connected and the staggered connection structure of the connectingrings 201 and the connectingrods 202 in the pipe sections, the mainbody pipe section 2 can keep certain rigidity and has better flexibility, so that better axial and radial supporting force is provided for an internal core wire while the flexibility of the internal core wire of the micro catheter is not changed, and the internal core wire can more effectively pass through blood vessels and lesion positions.

In the embodiment, theshaping pipe section 1 and the mainbody pipe section 2 are combined with each other, so that the micro guide wire protection pipe with good pushing performance and flexibility and plasticity at the head end is obtained, the micro guide wire protection pipe can adapt to most of blood vessels in a human body, the smoothness and the flexibility are both considered, and the micro guide wire protection pipe can easily enter the blood vessels to find a pathological change direction and is pushed to a pathological change position; and the multiple specifications of the micro guide wire protection tube can be avoided, and the production cost is reduced.

With continued reference to fig. 1-6, in some alternative embodiments of the present embodiment, it is preferable to use eachconnection ring 201 or connection ringThe length of the connectingrod 202 in the extending direction of the central axis of each connectingring 201 in each sub-pipe section is the width, and the length of each connectingring 201 or connectingrod 202 in the radial direction of each connectingring 201 in each sub-pipe section is the height, then: in the same sub-pipe section, the width and the height of any two connectingrings 201 are the same, and the width and the height of any two connectingrods 202 are the same; and the width of each connectingring 201 in the sub-tube section at the proximal side among two axially adjacent sub-tube sections is B₁₁ Each connectingrod 202 has a width B₂₁ Each connectingrod 202 has a height H₁ The width of each connectingring 201 in the distal sub-tube section is B₁₂ Each connectingrod 202 has a width B₂₂ Each connectingrod 202 has a height H₂ And then: b is₁₁ >B₁₂ ，B₂₁ =B₂₂ ，H₁ >H₂ 。

In short, in the same sub-pipe section, the size of each connectingring 201 is the same in pairs and the size of each connectingrod 202 is the same in pairs; along the axial direction and from the proximal end to the distal end, the width of the connectingring 201 is in a gradient decreasing trend, and the width of the connectingrod 202 is unchanged but the height of theconnecting rod 202 is in a gradient decreasing trend along with the width of the connectingring 201. When the mainbody pipe section 2 is formed by cutting a metal pipe by laser, the smaller the width of the connectingring 201 and the smaller the height of the connectingrod 202 are, the larger the laser cutting seam is, so that the flexibility of the mainbody pipe section 2 is better, otherwise, the larger the width of the connectingring 201 and the higher the height of the connectingrod 202 are, the smaller the laser cutting seam is, the poorer the flexibility of the mainbody pipe section 2 is, but the bending deformation is reduced, so that the pushing performance is enhanced, therefore, the mainbody pipe section 2 is preferably changed in the gradient manner, the good pushing performance is provided by the near end, and the good flexibility is provided by the far end, so that the complicated blood vessel can be conveniently bent.

Further preferably, in the present embodiment, in two adjacent sections of the sub-pipe sections, B₁₁ -B₁₂ Not less than 0.010mm; and/or, H₁ -H₂ ≥0.015mm。

In this embodiment, it is preferable that, in the mainbody pipe section 2, the length of each connectingring 201 or each connectingrod 202 in the extending direction of the central axis of each connectingring 201 in the sub-pipe section where the connectingring 201 or the connectingrod 202 is located is the respective width, and in the mainbody pipe section 2, the length of each connectingring 201 or each connectingrod 202 in the radial direction of each connectingring 201 in the sub-pipe section where the connectingring 201 is located is the respective height, then: in the integral structure of the main body pipe section 2: the width of each connectingring 201 is respectively more than or equal to 0.040mm and less than or equal to 0.100mm; and/or the width of each connectingrod 202 is more than or equal to 0.030mm and less than or equal to 0.050mm; and/or the height of each connectingrod 202 is greater than or equal to 0.060mm and less than or equal to 0.150mm.

In addition, in some optional embodiments of the present embodiment, it is preferable that, in the overall structure of the mainbody pipe segment 2, in every two adjacent groups of the connectingrods 202, each connectingrod 202 in the group of connectingrods 202 located on the proximal side is staggered from each connectingrod 202 in the group of connectingrods 202 located on the distal side in the circumferential direction; in the same sub-pipe section, each connectingrod 202 is arranged in a spiral trend, and the arrangement structure can further provide better pushing performance and flexibility, so that the micro guide wire protection tube can more smoothly reach the position of pathological changes.

In some optional embodiments of this embodiment, it is preferable that, for themain pipe section 2, at least two connectingrods 202 in the same connectingrod 202 group are arranged at equal intervals in the circumferential direction.

In some alternative embodiments of this embodiment, it is preferable that, for the mainbody tube segment 2, in the same sub-tube segment, the included angle between the central axis of eachconnection ring 201 and the axial direction is greater than or equal to 0 ° and less than or equal to 30 °, for example, but not limited to, as shown in fig. 1 to 4, in the same sub-tube segment, the included angle between the central axis of eachconnection ring 201 and the axial direction is 0 °, that is, coinciding with each other, and the radial plane of theconnection ring 201 is perpendicular to the axial direction, or, for example, but not limited to, as shown in fig. 5 and 6, in the same sub-tube segment, the included angle between the central axis of eachconnection ring 201 and the axial direction is 25 °, that is, the included angle between the radial plane of theconnection ring 201 and the axial direction is 90 ° to 25 °, that is, as shown in fig. 65 °, and the like, and preferably, the included angle between the central axis of eachconnection ring 201 and the axial direction is greater than 0 ° and less than or equal to 30 °.

In addition, in the present embodiment, it is preferable but not limited to: the thread pitch of the shapingtube section 1 is more than or equal to 0.120mm and less than or equal to 0.160mm, the flexibility and plasticity of the shapingtube section 1 are controlled by adjusting the thread pitch, and the thread pitch can be in gradual size change, gradient change or uniform thread pitch arrangement, and preferably the uniform thread pitch arrangement. And/or, preferably but not limited to: the axial length of the shapingpipe section 1 is more than or equal to 10mm and less than or equal to 15mm.

Example two

The present embodiment provides a micro guidewire assembly comprising the micro guidewire protection tube of any one of the alternative embodiments of the first embodiment.

Since the micro guidewire assembly provided by the present embodiment includes the micro guidewire protection tube described in the first embodiment, the micro guidewire assembly provided by the present embodiment can achieve all the beneficial effects that the micro guidewire protection tube can achieve in the first embodiment, and the specific structure and the achievable effects thereof can be obtained with reference to the optional or preferred embodiments in the first embodiment.

Finally, it should be noted that:

1. in this specification, "and/or" means "and/or" preceding structure is provided simultaneously with or in the alternative to "and/or" following structure;

2. the embodiments in the present description are all described in a progressive manner, each embodiment focuses on the differences from the other embodiments, and the same and similar parts among the embodiments can be referred to each other; the above embodiments in the present specification are only used for illustrating the technical solution of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A micro guide wire protection tube is characterized in that: comprises a shaping pipe section (1) and a main body pipe section (2);

the shaping pipe section (1) is of a spiral structure;

the proximal end of the shaping pipe section (1) is connected to the distal end of the main body pipe section (2); the extension direction of the central axis of the shaping pipe section (1) is used as the axial direction: the main body pipe section (2) comprises at least two sections of sub pipe sections which are arranged along the axial direction and are mutually connected;

each sub-pipe section comprises a plurality of connecting rings (201) and a plurality of connecting rod (202) groups; the connecting rings (201) are arranged at intervals in the axial direction, central axes of the connecting rings (201) extend in the same direction, every two adjacent connecting rings (201) are connected together through a connecting rod (202) group, each connecting rod (202) group comprises at least two connecting rods (202), the radial circumferential direction of the connecting rings (201) is taken as the circumferential direction, and the at least two connecting rods (202) in each connecting rod (202) group are arranged at intervals in the circumferential direction.

2. The micro guidewire protection tube according to claim 1, wherein:

taking the length of each connecting ring (201) or connecting rod (202) in the extending direction of the central axis of each connecting ring (201) in each sub-pipe section where the connecting ring (201) or connecting rod (202) is located as the width of the connecting ring or connecting rod, and taking the length of each connecting ring (201) or connecting rod (202) in the radial direction of each connecting ring (201) in each sub-pipe section where the connecting ring or connecting rod is located as the height of the connecting ring or connecting rod, then:

in the same sub-pipe section, the width and the height of any two connecting rings (201) are the same, and the width and the height of any two connecting rods (202) are the same;

and in two sections of the sub-pipe sections which are axially adjacent, the width of each connecting ring (201) in the sub-pipe section positioned at the proximal side is B₁₁ Each connecting rod (202) has a width B₂₁ Each connecting rod (202)Has a height of H₁ The width of each connecting ring (201) in the distal sub-section is B₁₂ Each connecting rod (202) has a width B₂₂ Each connecting rod (202) has a height H₂ And then: b₁₁ >B₁₂ ，B₂₁ =B₂₂ ，H₁ >H₂ 。

3. The micro-guidewire protection tube according to claim 2, wherein: in two adjacent sections of said sub-pipe section, B₁₁ -B₁₂ Not less than 0.010mm; and/or, H₁ -H₂ ≥0.015mm。

4. The micro guidewire protection tube according to any one of claims 1-3, wherein: taking the length of each connecting ring (201) or connecting rod (202) in the extending direction of the central axis of each connecting ring (201) in each sub-pipe section where the connecting ring (201) or connecting rod (202) is located as the width of the connecting ring or connecting rod, and taking the length of each connecting ring (201) or connecting rod (202) in the radial direction of each connecting ring (201) in each sub-pipe section where the connecting ring or connecting rod is located as the height of the connecting ring or connecting rod, then:

in the integral structure of the main body pipe section (2):

the width of each connecting ring (201) is more than or equal to 0.040mm and less than or equal to 0.100mm;

and/or the width of each connecting rod (202) is more than or equal to 0.030mm and less than or equal to 0.050mm;

and/or the height of each connecting rod (202) is more than or equal to 0.060mm and less than or equal to 0.150mm.

5. The micro guidewire protection tube according to any one of claims 1-3, wherein: in the integral structure of the main body pipe section (2), in every two adjacent connecting rod (202) groups, each connecting rod (202) in the connecting rod (202) group positioned at the near end side and each connecting rod (202) in the connecting rod (202) group positioned at the far end side are staggered in the circumferential direction; in the same sub-pipe section, the connecting rods (202) are arranged in a spiral trend.

6. The micro guidewire protection tube according to any one of claims 1-3, wherein: in the same connecting rod (202) group, the at least two connecting rods (202) are arranged at equal intervals in the circumferential direction.

7. The micro guidewire protection tube according to any one of claims 1-3, wherein: in the same sub-pipe section, the included angle between the central axis of each connecting ring (201) and the axial direction is more than or equal to 0 degree and less than or equal to 30 degrees.

8. The micro guidewire protection tube according to claim 1, wherein: the thread pitch of the shaping pipe section (1) is more than or equal to 0.120mm and less than or equal to 0.160mm; and/or the axial length of the shaping pipe section (1) is more than or equal to 10mm and less than or equal to 15mm.

9. The micro-guidewire protection tube according to claim 1, wherein: the shaping pipe section (1) and the main body pipe section (2) are respectively formed by fixedly connecting metal pipes after being integrally formed by laser cutting; or the shaping pipe section (1) and the main body pipe section (2) are formed by integrally forming the same metal pipe through laser cutting.

10. A micro-guidewire assembly, comprising: the micro guidewire protection tube comprising any one of claims 1 to 9.

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