Guide sheath tube

Abstract

The utility model relates to the technical field of guide sheathing canals, in particular to a guide sheathing canal which is of a hollow tubular structure and is characterized by comprising a guide-in section located at the far end and a main body section which is connected with the guide-in section and extends from the far end to the near end. The leading-in section sequentially comprises a leading-in section outer layer and a leading-in section inner layer from outside to inside; the main body section sequentially comprises a main body section outer layer, a main body section middle layer and a main body section inner layer from outside to inside, the hardness of the main body section is gradually reduced from the near end to the far end, the main body section middle layer is of a thread winding structure, and the main body section middle layer at least comprises one of a rigid winding layer for providing supporting force and a flexible winding layer for providing softness. Due to the fact that the main body section with the hardness gradually reduced from the near end to the far end is arranged, the main body section of the guiding sheath tube can be flexibly bent according to the requirements of various blood vessel turning radiuses and bending radians, and the guiding sheath tube is suitable for various use scenes.

Description

Technical Field

[0001] The utility model relates to the technical field of guide sheath tubes, in particular to a guide sheath tube. Background Art

[0002] As more and more interventional diagnosis and treatment are performed, the demand and function of interventional catheters are also increasing. Due to the different thickness and diameter of blood vessels, the interventional surgeries performed by various departments face different blood vessel diameters. Blood vessels of different diameters have different turning radius size requirements when bifurcating. If the turning radius of the working head of the interventional catheter is too large, it will not be able to enter the bifurcation of the blood vessel, or it will barely enter but will cause great friction damage to the blood vessel wall; if the turning radius of the catheter is small and the blood vessel encountered is very thick, it is possible that the curved head of the catheter cannot hook the bifurcation of the blood vessel, and it may slip off at the bifurcation of the blood vessel and fail to enter; sometimes the blood vessel may be from thick to thin, how to adapt to the requirements of various blood vessel turning radius and bending curvature, and how to better reduce friction damage are the problems that need to be solved at present.

[0003] Currently, most guide sheaths on the market have hard heads that will cause great friction damage when entering the blood vessel wall, and the guide sheaths have low plasticity. When passing through lesions with small turning radius of blood vessel bifurcations, they cannot be flexibly bent according to the requirements of various blood vessel turning radius and bending radian. Therefore, it is necessary to design a guide sheath that causes less damage to the blood vessel wall when entering the blood vessel, has high plasticity, and can be flexibly bent according to the requirements of various blood vessel turning radius and bending radian. Utility Model Content

[0004] The utility model provides a guide sheath which causes little damage to the blood vessel wall when entering the blood vessel, has high plasticity, and can be flexibly bent according to the requirements of various blood vessel turning radius and bending curvature, aiming to solve one or more of the above problems and other potential problems.

[0005] The utility model provides a guide sheath tube, which is a tubular structure with a hollow interior, characterized in that it comprises an introduction section located at a distal end and a main body section connected to the introduction section and extending from the distal end to the proximal end, wherein the introduction section comprises an introduction section outer layer and an introduction section inner layer in sequence from the outside to the inside;

[0006] The main body segment includes, from outside to inside, a main body segment outer layer, a main body segment middle layer and a main body segment inner layer. The hardness of the main body segment gradually decreases from the proximal end to the distal end. The main body segment middle layer is a threaded winding structure. The main body segment middle layer includes at least one of a rigid winding layer providing support force and a flexible winding layer providing softness.

[0007] The guide sheath of the utility model is provided with a soft introduction section to reduce the damage to the blood vessel wall when the guide sheath enters the blood vessel. The outer layer and the inner layer of the introduction section are made of flexible materials, the outer layer of the introduction section is plastic, and the inner layer of the introduction section is a polytetrafluoroethylene film. Furthermore, by providing a main body section whose hardness gradually decreases from the proximal end to the distal end, the main body section can be flexibly bent according to the requirements of various blood vessel turning radius and bending curvature, and is suitable for a variety of usage scenarios.

[0008] Furthermore, according to the structure of the middle layer of the main section of the guide sheath, a guide sheath with only a rigid winding layer, only a flexible winding layer, or both a rigid winding layer and a flexible winding layer can be provided to meet different requirements for the hardness of the guide sheath in different scenarios.

[0009] In some embodiments, the hardness of the layer in the main body segment decreases stepwise from the proximal end to the distal end.

[0010] Furthermore, by setting the hardness of the middle layer of the main section to decrease in a step-by-step manner from the proximal end to the distal end, the effect of reducing the hardness of the main section is achieved. Compared with the linear reduction, the step-by-step reduction in hardness can better control the hardness of different positions of the guide sheath, thereby facilitating the control of the bending degree at different positions and achieving a flexible bending effect.

[0011] In some embodiments, the rigid winding layer is formed by connecting several sections of threaded winding structures with different pitches, and the pitch of the threaded winding structure of the rigid winding layer decreases in a step-like manner from the proximal end to the distal end.

[0012] Furthermore, a rigid winding layer is prepared by connecting threaded winding structures with different pitches to support the main body segment. The hardness of the threaded winding structure is controlled by controlling the pitch, thereby controlling the step-by-step change in the hardness of the main body segment, which facilitates flexible bending of the main body segment. The preparation process is simple, easy to implement, and convenient for large-scale production.

[0013] In some embodiments, the outer layer of the main body segment is formed by connecting several tubular structures with different hardnesses, and the hardness of the outer layer of the main body segment decreases stepwise from the proximal end to the distal end.

[0014] Furthermore, by providing the outer layer of the main body segment with different hardness, in coordination with the rigid winding layer in the middle layer of the main body segment, the hardness of the main body segment of the guide sheath can be further ensured to change in a step-like manner, thereby increasing the hardness difference at different positions of the main body segment and facilitating the realization of different bending degrees at different positions of the main body segment.

[0015] In some embodiments, the middle layer of the main body segment includes a rigid winding layer and a flexible winding layer, and the rigid winding layer is wound and connected with the flexible winding layer.

[0016] Furthermore, when the middle layer of the main body segment is provided with both a flexible winding layer and a rigid winding layer, the flexible winding layer and the rigid winding layer are cross-wound and connected, so that the main body segment has both softness and rigidity, which is suitable for scenarios with high softness requirements such as thin blood vessel walls.

[0017] In some embodiments, the rigid winding layer has a greater hardness than the flexible winding layer.

[0018] In some embodiments, the length of the introduction section is 2-3 mm.

[0019] In some embodiments, the length of the main body segment is 100~150mm.

[0020] In some embodiments, the diameter of the guide sheath is 2-3 mm.

[0021] In some embodiments, the outer layer of the main body segment is plastic, and the inner layer of the main body segment is a polytetrafluoroethylene film.

[0022] By implementing the above technical solution, the utility model has the following advantages:

[0023] 1. The guide sheath of the utility model is provided with a soft introduction section to reduce the damage to the blood vessel wall when the guide sheath enters the blood vessel. By providing a main section with a gradually decreasing hardness from the proximal end to the distal end, the main section can be flexibly bent according to the requirements of various blood vessel turning radius and bending curvature, and is suitable for a variety of usage scenarios.

[0024] 2. The utility model controls the structure of the middle layer of the main section of the guide sheath to provide a guide sheath with only a rigid winding layer, only a flexible winding layer, or both a rigid winding layer and a flexible winding layer, so as to meet the different hardness requirements for the guide sheath in different scenarios.

[0025] 3. The utility model can achieve the effect of reducing the hardness of the main section by setting the hardness of the middle layer of the main section to decrease from the proximal end to the distal end in a step-by-step manner. Compared with the linear reduction, the step-by-step reduction of hardness can better control the hardness of different positions of the guide sheath tube, facilitate the control of the bending degree of different positions, and achieve the effect of flexible bending. At the same time, by controlling the pitch to control the hardness of the thread winding structure, the preparation process is simple, easy to implement, and convenient for large-scale production.

[0026] 4. The utility model further ensures that the hardness of the main section of the guide sheath tube changes in a step-like manner by providing an outer layer of the main section with different hardnesses, which cooperates with the rigid winding layer in the middle layer of the main section, thereby increasing the hardness difference at different positions of the main section and facilitating different bending degrees at different positions of the main section.

[0027] 5. When the middle layer of the main body section of the utility model is provided with both a flexible winding layer and a rigid winding layer, the flexible winding layer and the rigid winding layer are cross-wound and connected, so that the main body section has both softness and rigidity, which is suitable for scenes with high softness requirements such as thin blood vessel walls. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 is a structural perspective view of the guide sheath in Example 1;

[0030] Figure 2 is a cross-sectional view of the main body section in Example 1;

[0031] Figure 3 is a structural perspective view of the guide sheath in Example 2;

[0032] Figure 4 This is a structural perspective view of the guide sheath in Example 3.

[0033] The symbols in the figure represent:

[0034] 1. Lead-in section, 11. Outer layer of lead-in section, 12. Inner layer of lead-in section, 2. Main section, 21. Outer layer of main section, 22. Middle layer of main section, 221. Rigid winding layer, 222. Flexible winding layer, 23. Inner layer of main section. DETAILED DESCRIPTION

[0035] The utility model is further described in detail below based on the accompanying drawings and specific embodiments.

[0036] It should be noted that the following implementation cases are only used to illustrate the technical solutions of the utility model, rather than to limit it. Those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the implementation cases of the utility model.

[0037] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate directions or positional relationships are only used to facilitate the description of the embodiments and simplify the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction. Therefore, it should not be understood as a limitation on the present invention.

[0038] Embodiment 1:

[0039] This embodiment provides a guide sheath tube, such as Figure 1 As shown, the guide sheath is a tubular structure with a hollow interior, characterized in that it includes an introduction section 1 located at the distal end and a main body section 2 connected to the introduction section 1 and extending from the distal end to the proximal end, and the introduction section 1 includes an introduction section outer layer 11 and an introduction section inner layer 12 from the outside to the inside;

[0040] like Figure 2 As shown, the main body segment 2 includes a main body segment outer layer 21, a main body segment middle layer 22 and a main body segment inner layer 23 from the outside to the inside. The hardness of the main body segment 2 gradually decreases from the proximal end to the distal end. The main body segment middle layer 22 is a threaded winding structure, and the main body segment middle layer 22 includes a rigid winding layer 221 that provides support force.

[0041] like Figure 1 As shown, the guide sheath of this embodiment is provided with a 3mm soft introduction section 1 at the distal end, and the introduction section 1 is only provided with an introduction section outer layer 11 and an introduction section inner layer 12, so as to reduce the damage to the blood vessel wall when the guide sheath enters the blood vessel. In the embodiment, the introduction section outer layer 11 and the introduction section inner layer 12 are made of flexible materials, the introduction section outer layer 11 is plastic, and the introduction section inner layer 12 is a polytetrafluoroethylene film. The length of the main section 2 is 142mm.

[0042] In the embodiment, the main body middle layer 22 includes a rigid winding layer 221 that provides support, and the rigid winding layer 221 is formed by connecting a plurality of sections of thread winding structures with different pitches, and the pitch of the thread winding structure of the rigid winding layer 221 decreases in a step-like manner from the proximal end to the distal end. The hardness of the main body middle layer 22 decreases in a step-like manner from the proximal end to the distal end.

[0043] like Figure 1 As shown, in the embodiment, the rigid winding layer 221 of the middle layer 22 of the main body segment is connected by 4 sections of threaded winding structures with different pitches, and the pitch of each section is 0.3mm, 0.4mm, 0.5mm, and 0.6mm, respectively. The hardness of the middle layer 22 of the main body segment decreases stepwise from the proximal end to the distal end through the step-by-step increase of the pitch, so that the bending flexibility of the middle layer 22 of the main body segment increases stepwise from the proximal end to the distal end, thereby achieving the effect of stepwise reduction of the hardness of the main body segment 2 from the proximal end to the distal end, and the step-by-step reduction of the hardness can better control the hardness of different positions of the guide sheath compared to the linear reduction, so as to facilitate the control of the bending degree of different positions, so as to achieve the effect of flexible bending of the guide sheath in the blood vessel.

[0044] Furthermore, a rigid winding layer 221 is prepared by connecting threaded winding structures with different pitches to support the main body section 2. The hardness of the threaded winding structure is controlled by controlling the pitch, thereby controlling the step-wise change of the hardness of the main body section 2, which facilitates flexible bending of the main body section 2. The preparation process is simple, easy to implement, and convenient for large-scale production.

[0045] Furthermore, if Figure 1 As shown, the outer layer 21 of the main body segment is formed by connecting several sections of tubular structures with different hardness, and the hardness of the outer layer 21 of the main body segment decreases stepwise from the proximal end to the distal end. In the embodiment, the main body segment 2 whose hardness gradually decreases from the proximal end to the distal end is set by using materials of different hardness, so that the main body segment 2 can be flexibly bent according to the requirements of various blood vessel turning radius and bending arc, and is suitable for a variety of use scenarios. The lengths of each section of the outer layer 21 of the main body segment are 7mm, 15mm, 20mm, and 100mm respectively, and the diameter of the guide sheath is 2mm. The outer layer 21 of the main body segment and the inner layer 23 of the main body segment are flexible materials, and the outer layer 21 of the main body segment is plastic with different hardness. The tubular structures of the outer layer 21 of the main body segment are connected by welding, and the inner layer 23 of the main body segment is a polytetrafluoroethylene film. The middle layer 22 of the main body segment is a rigid material, and the middle layer 22 of the main body segment is 304 stainless steel with different hardness. The threaded winding structures of the middle layer 22 of the main body segment of each section are connected by welding.

[0046] Furthermore, in the embodiment, by providing the outer layer 21 of the main body segment with different hardness, and cooperating with the rigid winding layer 221 of the middle layer 22 of the main body segment, it is further ensured that the hardness of the main body segment 2 of the guide sheath tube changes in a step-like manner, thereby increasing the hardness difference at different positions of the main body segment 2, and facilitating the realization of different bending degrees at different positions of the main body segment 2.

[0047] Embodiment 2:

[0048] This embodiment provides a guide sheath tube, such as Figure 3 As shown, the guide sheath is a tubular structure with a hollow interior, characterized in that it includes an introduction section 1 located at the distal end and a main body section 2 connected to the introduction section 1 and extending from the distal end to the proximal end, and the introduction section 1 includes an introduction section outer layer 11 and an introduction section inner layer 12 from the outside to the inside;

[0049] The main body section 2 includes a main body section outer layer 21, a main body section middle layer 22 and a main body section inner layer 23 from the outside to the inside. The hardness of the main body section 2 gradually decreases from the proximal end to the distal end. The main body section middle layer 22 is a threaded winding structure. The main body section middle layer 22 includes a rigid winding layer 221 for providing support and a flexible winding layer 222 for providing softness. The rigid winding layer 221 is wound and connected with the flexible winding layer 222.

[0050] like Figure 3As shown, in the embodiment, the middle layer 22 of the main body segment is provided with a flexible winding layer 222 and a rigid winding layer 221. The flexible winding layer 222 is cross-wound and connected with the rigid winding layer 221. The hardness of the rigid winding layer 221 is greater than that of the flexible winding layer 222, so that the main body segment 2 has both softness and rigidity, which is suitable for scenes with high softness requirements such as thin blood vessel walls.

[0051] like Figure 3 As shown, the guide sheath of this embodiment is provided with a 2mm soft introduction section 1 at the distal end, and the introduction section 1 is only provided with an introduction section outer layer 11 and an introduction section inner layer 12, so as to reduce the damage to the blood vessel wall when the guide sheath enters the blood vessel. In the embodiment, the introduction section outer layer 11 and the introduction section inner layer 12 are made of flexible materials, the introduction section outer layer 11 is plastic, and the introduction section inner layer 12 is a polytetrafluoroethylene film. The length of the main section 2 is 100mm.

[0052] Furthermore, if Figure 3 As shown, in the embodiment, by providing the main body segment outer layer 21 with different hardnesses, and cooperating with the main body segment middle layer 22, the hardness of the main body segment 2 of the guide sheath tube is ensured to change in a step-like manner, and the hardness difference at different positions of the main body segment 2 is increased, so as to facilitate different bending degrees at different positions of the main body segment 2. The main body segment outer layer 21 is formed by connecting a plurality of tubular structures with different hardnesses, and the hardness of the main body segment outer layer 21 decreases in a step-like manner from the proximal end to the distal end.

[0053] In the embodiment, materials of different hardness are used to set the main body section 2 whose hardness gradually decreases from the proximal end to the distal end, so that the main body section 2 can be flexibly bent according to the requirements of various blood vessel turning radius and bending arc, and is suitable for a variety of usage scenarios. The lengths of the sections of the outer layer 21 of the main body section are 15mm, 20mm, and 65mm, respectively, so as to achieve the effect of stepwise reduction of the hardness of the main body section 2 from the proximal end to the distal end, and the stepwise reduction of the hardness can better control the hardness of different positions of the guide sheath tube compared to the linear reduction, so as to facilitate the control of the bending degree of different positions, so as to achieve the effect of flexible bending of the guide sheath tube in the blood vessel.

[0054] In the embodiment, the diameter of the guide sheath is 3 mm, the outer layer 21 of the main body section and the inner layer 23 of the main body section are made of flexible materials, the outer layer 21 of the main body section is plastics of different hardness, the tubular structures of the outer layer 21 of the main body section are connected by welding, the inner layer 23 of the main body section is a polytetrafluoroethylene film, the middle layer 22 of the main body section is made of a rigid material, and the middle layer 22 of the main body section is 304 stainless steel.

[0055] Embodiment 3:

[0056] This embodiment provides a guide sheath tube, such as Figure 4As shown, the guide sheath is a tubular structure with a hollow interior, characterized in that it includes an introduction section 1 located at the distal end and a main body section 2 connected to the introduction section 1 and extending from the distal end to the proximal end, and the introduction section 1 includes an introduction section outer layer 11 and an introduction section inner layer 12 from the outside to the inside;

[0057] The main body section 2 includes a main body section outer layer 21, a main body section middle layer 22 and a main body section inner layer 23 from the outside to the inside. The hardness of the main body section 2 gradually decreases from the proximal end to the distal end. The main body section middle layer 22 is a threaded winding structure. The main body section middle layer 22 includes a rigid winding layer 221 for providing support and a flexible winding layer 222 for providing softness. The rigid winding layer 221 is wound and connected with the flexible winding layer 222.

[0058] like Figure 4 As shown, in the embodiment, the middle layer 22 of the main body segment is provided with a flexible winding layer 222 and a rigid winding layer 221. The flexible winding layer 222 is cross-wound and connected with the rigid winding layer 221. The hardness of the rigid winding layer 221 is greater than that of the flexible winding layer 222, so that the main body segment 2 has both softness and rigidity, which is suitable for scenes with high softness requirements such as thin blood vessel walls.

[0059] like Figure 4 As shown, the guide sheath of this embodiment is provided with a 2mm soft introduction section 1 at the distal end, and the introduction section 1 is only provided with an introduction section outer layer 11 and an introduction section inner layer 12, so as to reduce the damage to the blood vessel wall when the guide sheath enters the blood vessel. In the embodiment, the introduction section outer layer 11 and the introduction section inner layer 12 are made of flexible materials, the introduction section outer layer 11 is plastic, and the introduction section inner layer 12 is a polytetrafluoroethylene film. The length of the main section 2 is 120mm.

[0060] Furthermore, in the embodiment, the rigid winding layer 221 and the flexible winding layer 222 of the middle layer 22 of the main body segment are both connected by two sections of threaded winding structures with different pitches, and the pitches of the two sections are 0.4 mm and 0.6 mm, respectively. The hardness of the middle layer 22 of the main body segment decreases stepwise from the proximal end to the distal end through the step-by-step increase of the pitch, thereby increasing the bending flexibility of the middle layer 22 of the main body segment from the proximal end to the distal end, thereby achieving the effect of step-by-step reduction of the hardness of the main body segment 2 from the proximal end to the distal end, and the step-by-step reduction of the hardness can better control the hardness of different positions of the guide sheath compared to the linear reduction, so as to facilitate the control of the bending degree of different positions, thereby achieving the effect of flexible bending of the guide sheath in the blood vessel.

[0061] Furthermore, a rigid winding layer 221 and a flexible winding layer 222 are prepared by connecting threaded winding structures with different pitches to support the main body segment 2. The hardness of the threaded winding structure is controlled by controlling the pitch, thereby controlling the step-wise change of the hardness of the main body segment 2, which facilitates flexible bending of the main body segment 2. The preparation process is simple, easy to implement, and convenient for large-scale production.

[0062] Furthermore, if Figure 4 As shown, in the embodiment, by providing the main body segment outer layer 21 with different hardnesses, and cooperating with the main body segment middle layer 22, the hardness of the main body segment 2 of the guide sheath tube is ensured to change in a step-like manner, and the hardness difference at different positions of the main body segment 2 is increased, so as to facilitate different bending degrees at different positions of the main body segment 2. The main body segment outer layer 21 is formed by connecting two tubular structures with different hardnesses, and the hardness of the main body segment outer layer 21 decreases in a step-like manner from the proximal end to the distal end.

[0063] In the embodiment, materials of different hardness are used to set the main body section 2 whose hardness gradually decreases from the proximal end to the distal end, so that the main body section 2 can be flexibly bent according to the requirements of various blood vessel turning radius and bending arc, and is suitable for a variety of usage scenarios. The lengths of each section of the outer layer 21 of the main body section are 35mm and 85mm respectively, so as to achieve the effect of stepwise reduction of the hardness of the main body section 2 from the proximal end to the distal end, and the stepwise reduction of the hardness can better control the hardness of different positions of the guide sheath tube compared with the linear reduction, so as to facilitate the control of the bending degree of different positions, so as to achieve the effect of flexible bending of the guide sheath tube in the blood vessel.

[0064] In the embodiment, the diameter of the guide sheath is 3 mm, the outer layer 21 of the main body section and the inner layer 23 of the main body section are made of flexible materials, the outer layer 21 of the main body section is plastics of different hardnesses, the tubular structures of the outer layer 21 of the main body section are connected by welding, the inner layer 23 of the main body section is a polytetrafluoroethylene film, the middle layer 22 of the main body section is made of rigid material, the middle layer 22 of the main body section is 304 stainless steel of different hardnesses, and the threaded winding structures of the middle layer 22 of the main body section of each section are connected by welding.

[0065] The applicant declares that the above is only a specific implementation method of the utility model, but the protection scope of the utility model is not limited to this. Technical personnel in the relevant technical field should understand that any changes or substitutions that can be easily thought of by technical personnel in the relevant technical field within the technical scope disclosed in the utility model fall within the protection scope and disclosure scope of the utility model.

Claims

1. A guide sheath tube, the guide sheath tube is a tubular structure with a hollow interior, characterized in that: It comprises an introduction section (1) located at the distal end and a main body section (2) connected to the introduction section (1) and extending from the distal end to the proximal end, wherein the introduction section (1) comprises, from the outside to the inside, an introduction section outer layer (11) and an introduction section inner layer (12); The main body section (2) comprises, from outside to inside, a main body section outer layer (21), a main body section middle layer (22) and a main body section inner layer (23); the hardness of the main body section (2) gradually decreases from the proximal end to the distal end; the main body section middle layer (22) is a threaded winding structure; the main body section middle layer (22) comprises at least one of a rigid winding layer (221) providing support force and a flexible winding layer (222) providing softness.

2. The guide sheath according to claim 1, characterized in that: The hardness of the middle layer (22) of the main body section decreases in a step-like manner from the proximal end to the distal end.

3. The guide sheath according to claim 2, characterized in that: The rigid winding layer (221) is formed by connecting a plurality of sections of thread winding structures with different pitches, and the pitch of the thread winding structure of the rigid winding layer (221) decreases in a step-like manner from the proximal end to the distal end.

4. The guide sheath according to claim 3, characterized in that: The outer layer (21) of the main body section is formed by connecting a plurality of tubular structures of different hardnesses, and the hardness of the outer layer (21) of the main body section decreases in a step-like manner from the proximal end to the distal end.

5. The guide sheath according to any one of claims 1 to 4, characterized in that: The main body section middle layer (22) comprises a rigid winding layer (221) and a flexible winding layer (222), and the rigid winding layer (221) and the flexible winding layer (222) are wound and connected.

6. The guide sheath according to claim 5, characterized in that: The rigid winding layer (221) has a harderness than that of the flexible winding layer (222).

7. The guide sheath according to claim 6, characterized in that: The length of the introduction section (1) is 2-3 mm.

8. The guide sheath according to claim 7, characterized in that: The length of the main body section (2) is 100-150 mm.

9. The guide sheath according to claim 8, characterized in that: The diameter of the guide sheath is 2-3 mm.

10. The guide sheath according to claim 9, characterized in that: The outer layer (21) of the main body section is plastic, and the inner layer (23) of the main body section is a polytetrafluoroethylene film.

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