Introducer sheath

Abstract

The utility model provides a kind of introduction sheath, it includes inner layer pipe, outer layer pipe and the reinforcing layer between the inner layer pipe and the outer layer pipe;Wherein, the reinforcing layer includes first reinforcing section, second reinforcing section connected to the first reinforcing section proximal end, the second reinforcing section is provided with the first through slot extending along the introduction sheath axial direction.This utility model the introduction sheath adopts three-layer structure, improve the structural strength of the introduction sheath by the reinforcing layer in the middle, by the first reinforcing section keep the integrity of the introduction sheath distal end inner cavity, by the second reinforcing section improve the radial support force of the introduction sheath and realize the stable connection of three-layer structure.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to an introductory sheath. Background Technology

[0002] The insertion sheath serves as a bridge connecting the access device to the coil or stent. However, the sizes of the catheter hub and insertion sheath designed by different manufacturers on the market are inconsistent, making effective matching impossible. Therefore, when actually connecting the insertion sheath to the microcatheter, due to differences in physician experience, doctors tend to habitually compress the insertion sheath and catheter hub to minimize the gap between them.

[0003] Reference Figure 1 The current inlet sheath is 100. ， Made of polymer materials, in order to allow the insertion of the sheath 100 ， The outlet is closer to the inner inlet of the microcatheter 300, and the sheath 100 is inserted. ， The closer to the inner inlet of the microcatheter 300, the more the sheath 100 is inserted. ， The smaller the outer diameter, the better, but the insertion sheath 100 ， The inner diameter of the delivery chamber needs to remain constant, which results in a thin wall at the tip, lacking sufficient strength to maintain the shape of the inner chamber. The doctor compresses the insertion sheath 100... ， When the catheter hub is 200, it will cause the insertion sheath to be 100. ， The deformation of the head end reduces the inner diameter, or even causes bending deformation of the tapered section of the tube, which in turn prevents instruments such as spring coils or supports from passing through the insertion sheath. ， Successfully entered the microcatheter within 300 mm.

[0004] In view of this, it is necessary to provide an inlet sheath to solve the above-mentioned technical problems. Utility Model Content

[0005] To achieve the above objectives, this utility model provides an inlet sheath, which includes an inner tube, an outer tube, and a reinforcing layer located between the inner tube and the outer tube;

[0006] The reinforcing layer includes a first reinforcing section and a second reinforcing section connected to the proximal end of the first reinforcing section. The second reinforcing section is provided with a first through groove extending axially along the inlet sheath.

[0007] As a further improvement of this utility model, the second reinforcing section is provided with a plurality of first hollow areas arranged along the axial direction of the inlet sheath, and each of the first hollow areas is provided with a plurality of first through grooves arranged along the circumference of the inlet sheath.

[0008] As a further improvement of this utility model, a plurality of the first through grooves in the first hollow area are evenly arranged along the circumference of the inlet sheath.

[0009] Alternatively, the first through slots in two adjacent first hollow areas may be staggered.

[0010] Alternatively, the first through grooves in two adjacent first hollow areas are aligned.

[0011] As a further improvement of this utility model, the reinforcing layer further includes a third reinforcing section connected to the proximal end of the second reinforcing section, the third reinforcing section being provided with a second through groove extending circumferentially along the inlet sheath.

[0012] As a further improvement of this utility model, the third reinforcing section is provided with a plurality of second hollow areas arranged along the axial direction of the inlet sheath, and each of the second hollow areas is provided with a plurality of second through grooves arranged along the circumference of the inlet sheath.

[0013] As a further improvement of this utility model, a plurality of second through grooves in the second hollow area are evenly arranged along the circumference of the inlet sheath.

[0014] Alternatively, the second through slots in two adjacent second hollow areas may be staggered.

[0015] Alternatively, the second through grooves in two adjacent second hollow areas are aligned.

[0016] As a further improvement of this utility model, the hollowing ratio of the second reinforcing segment is less than that of the third reinforcing segment.

[0017] As a further improvement of this utility model, in the direction from the proximal end to the distal end, the distal end of the first reinforcing segment extends beyond the distal end of the outer tube, while the distal end of the second reinforcing segment does not extend beyond the distal end of the outer tube.

[0018] As a further improvement of this utility model, the length of the first reinforcing section along the axial direction of the inlet sheath is 1mm to 5mm, and the length of the second reinforcing section along the axial direction of the inlet sheath is 20mm to 40mm.

[0019] As a further improvement of this utility model, the inlet sheath includes a first tube segment and a second tube segment connected to the proximal end of the first tube segment. From the proximal end to the distal end, the thickness of the outer tube of the first tube segment gradually decreases.

[0020] The first reinforced section and the second reinforced section are located in the first pipe section.

[0021] As a further improvement of this utility model, the sum of the lengths of the first reinforcing section and the second reinforcing section along the axial direction of the inlet sheath is less than or equal to the length of the first tube segment along the axial direction of the inlet sheath.

[0022] The beneficial effects of this utility model are as follows: The inlet sheath in this utility model adopts a three-layer structure. The middle reinforcing layer improves the structural strength of the inlet sheath, the first reinforcing section maintains the integrity of the distal inner cavity of the inlet sheath, and the second reinforcing section improves the radial support force of the inlet sheath and realizes a stable connection of the three-layer structure. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0024] Figure 1 This is a schematic diagram of an existing introductory sheath inserted into a catheter hub.

[0025] Figure 2 This is a schematic diagram of the structure of the inlet sheath of this utility model;

[0026] Figure 3 This is a schematic diagram showing the boundary between the first and second sections of the sheath in this utility model.

[0027] Figure 4 This is a schematic diagram showing the boundaries between the first, second, and third reinforcing sections of the imported sheath of this utility model;

[0028] Figure 5 for Figure 4 A magnified structural diagram of A in the middle;

[0029] Figure 6 for Figure 4 A magnified structural diagram of B in the diagram;

[0030] Figure 7 for Figure 4 A magnified structural diagram of C;

[0031] Figure 8 This is a schematic diagram of the reinforcing layer of this utility model after it has been unfolded. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, it should be understood that the terms "inner" and "outer", 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 this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. In this document, the end of the insertion sheath closer to the doctor is defined as the proximal end, and the end farther from the doctor is defined as the distal end.

[0036] like Figures 2 to 8 As shown, the inlet sheath 100 provided by this utility model is a three-layer tubular structure, including an inner tube 101, a reinforcing layer 102 and an outer tube 103 arranged sequentially from the inside to the outside. The reinforcing layer 102 is located between the inner tube 101 and the outer tube 103.

[0037] The inner tube 101 serves as a lubricating layer, directly contacting the spring coil or support, reducing the pushing resistance of the spring coil or support within the inlet sheath 100 and facilitating its release. Simultaneously, the inner tube 101 prevents the reinforcing layer 102 from directly contacting the spring coil or support, thus avoiding wear. Preferably, the inner tube 101 is made of polytetrafluoroethylene (PTFE), which has an extremely low coefficient of friction; the thickness of the inner tube 101 is 0.01 mm to 0.05 mm.

[0038] The reinforcing layer 102 is used to improve the structural strength of the inlet sheath 100, facilitating the doctor's smooth insertion of the inlet sheath 100 into the catheter seat 200. Simultaneously, it ensures that the inlet sheath 100, despite its thin wall thickness, possesses strong bending and compressive strength, thereby preventing deformation or bending of the inlet sheath 100 when pressed against the catheter seat 200. Preferably, the reinforcing layer 102 can be made of stainless steel, nickel-titanium alloy, or other metallic materials; the thickness of the reinforcing layer 102 is 0.01mm to 0.05mm.

[0039] The outer tube 103 serves as a protective layer and cooperates with the inner tube 101 to fix the reinforcing layer 102. Preferably, the material of the outer tube 103 is any one of PTFE, PEBAX, HDPE, and nylon, and the thickness of the outer tube 103 is 0.05mm to 0.2mm.

[0040] The inner diameter of the inlet sheath 100 can be adjusted according to the size of the delivery device, and this application does not impose any specific limitations on this.

[0041] The reinforcing layer 102 includes a first reinforcing segment 102a and a second reinforcing segment 102b connected to the proximal end of the first reinforcing segment 102a. Specifically, refer to... Figure 4 The first reinforcing segment 102a and the second reinforcing segment 102b are separated by L1.

[0042] The bonding strength between the reinforcing layer 102, made of metallic material, and the inner tube 101 is poor, making it difficult to achieve a reliable connection between the inner tube 101 and the reinforcing layer 102. Therefore, the second reinforcing section 102b is provided with a first through groove 102b-1. The first through groove 102b-1 allows the inner tube 101 and the outer tube 103 to connect to each other, thereby enabling the three-layer structure to be bonded together and simultaneously fixing the reinforcing layer 102 located between the inner tube 101 and the outer tube 103, increasing the diversity of material selection and structural design. In this embodiment, the three-layer structure is connected together via thermorheological means.

[0043] The distal end of the first reinforcing section 102a is pressed against the catheter seat 200. To resist the radial force generated by the mutual compression between the distal end of the inlet sheath 100 and the catheter seat 200, to maintain the integrity of the distal end lumen of the inlet sheath 100, and to prevent deformation of the distal end lumen of the inlet sheath 100 that would prevent the instrument from entering the microcatheter 300, the first reinforcing section 102a is not provided with a through groove, that is, to maintain the integrity of the first reinforcing section 102a to improve its structural strength and deformation resistance.

[0044] It should be noted that, to prevent bending deformation of the portion containing the second reinforcing section 102b, the first through groove 102b-1 extends along the axial direction of the inlet sheath 100. Thus, when the distal end of the inlet sheath 100 is pressed against the catheter seat 200, the portion containing the second reinforcing section 102b can effectively resist bending deformation, preventing the instrument's path from tilting.

[0045] Reference Figure 8 The second reinforcing section 102b is provided with a plurality of first hollow areas 102b-2 arranged along the axial direction of the inlet sheath 100. The area shown by the dashed box in the second reinforcing section 102b in the figure is the first hollow area 102b-2. Each of the first hollow areas 102b-2 is provided with a plurality of first through grooves 102b-1 arranged circumferentially along the inlet sheath 100. In this way, the connection area between the inner tube 101 and the outer tube 103 can be further increased, and the stability of the three-layer structure connection can be improved.

[0046] Preferably, a plurality of the first through grooves 102b-1 within the first hollowed-out area 102b-2 are evenly arranged along the circumference of the inlet sheath 100. This maintains the structural strength of the second reinforcing section 102b while ensuring that the connection positions between the inner tube 101 and the outer tube 103 are evenly distributed along the circumference of the inlet sheath 100, thereby further improving the stability of the three-layer structure connection.

[0047] The first through grooves 102b-1 in the two adjacent first hollow areas 102b-2 are staggered, which can improve the ability of the part where the second reinforcing section 102b is located to resist bending deformation.

[0048] Of course, the setting of the first through groove 102b-1 is not limited to this and can be adaptively adjusted according to the needs of the inlet sheath 100. Alternatively, the first through grooves 102b-1 in two adjacent first hollow areas 102b-2 can be aligned.

[0049] The reinforcing layer 102 further includes a third reinforcing segment 102c connected to the proximal end of the second reinforcing segment 102b, wherein the second reinforcing segment 102b is located between the first reinforcing segment 102a and the third reinforcing segment 102c. It can be understood that the reinforcing layer 102 includes the first reinforcing segment 102a, the second reinforcing segment 102b, and the third reinforcing segment 102c, arranged sequentially from the distal end to the proximal end. Specifically, refer to... Figure 4 The second reinforcing segment 102b and the third reinforcing segment 102c are separated by L2.

[0050] The third reinforcing section 102c is provided with a second through groove 102c-1, which is the same as the first through groove 102b-1. The second through groove 102c-1 allows the inner tube 101 and the outer tube 103 to be connected to each other, so that the three-layer structure can be bonded together, while fixing the reinforcing layer 102 located between the inner tube 101 and the outer tube 103.

[0051] It should be noted that, in order to ensure good radial flexibility in the portion containing the third reinforcing section 102c, the second through groove 102c-1 extends circumferentially along the inlet sheath 100. Thus, the portion containing the third reinforcing section 102c can be bent to accommodate the coil.

[0052] Reference Figure 8 The third reinforcing section 102c is provided with a plurality of second hollow areas 102c-2 arranged along the axial direction of the inlet sheath 100. The area shown by the dashed box in the third reinforcing section 102c in the figure is the second hollow area 102c-2. Each of the second hollow areas 102c-2 is provided with a plurality of second through grooves 102c-1 arranged circumferentially along the inlet sheath 100. This further increases the connection area between the inner tube 101 and the outer tube 103, improving the stability of the three-layer structure connection; simultaneously, the plurality of second through grooves 102c-1 located in the same second hollow area 102c-2 allow the portion of the third reinforcing section 102c to bend in any direction.

[0053] Preferably, a plurality of second through grooves 102c-1 within the second hollowed-out area 102c-2 are evenly arranged along the circumference of the inlet sheath 100. This maintains the structural strength of the third reinforcing section 102c while ensuring that the connection positions between the inner tube 101 and the outer tube 103 are evenly distributed along the circumference of the inlet sheath 100, thereby further improving the stability of the three-layer structure connection.

[0054] The second through grooves 102c-1 within two adjacent second hollow areas 102c-2 are staggered, which improves the structural strength of the portion containing the third reinforcing section 102c. Alternatively, the second through grooves 102c-1 within two adjacent second hollow areas 102c-2 are aligned, thereby facilitating the bending of the third reinforcing section 102c in any direction.

[0055] Of course, the setting of the second through groove 102c-1 is not limited to this and can be adapted to the needs of the inlet sheath 100. The second through groove 102c-1 can also be set to extend along the axial direction of the inlet sheath 100.

[0056] In this embodiment, the hollowing ratio of the second reinforcing section 102b is less than that of the third reinforcing section 102c, that is, the density of the first through groove 102b-1 is less than that of the second through groove 102c-1, thereby enabling the second reinforcing section 102b to effectively resist bending deformation and enabling the third reinforcing section 102c to have good flexibility.

[0057] The inlet sheath 100 further includes a first tube segment 104 and a second tube segment 105 connected to the proximal end of the first tube segment 104. The thickness of the outer tube 103 of the first tube segment 104 gradually decreases from the proximal end to the distal end.

[0058] Specifically, refer to Figure 3 The first tube segment 104 and the second tube segment 105 are separated by line L3. The thickness of the outer tube 103 in the first tube segment 104 gradually decreases from the proximal end to the distal end; that is, the wall thickness of the first tube segment 104 gradually decreases from the proximal end to the distal end. This ensures that when the introductory sheath 100 is inserted into the catheter hub 200, the distal end of the introductory sheath 100 can be as close as possible to the inlet of the microcatheter 300. The wall thickness of the second tube segment 105 remains constant from the proximal end to the distal end.

[0059] In this embodiment, the first reinforcing section 102a and the second reinforcing section 102b are located in the first pipe section 104, that is, the portion where the first reinforcing section 102a and the second reinforcing section 102b are located corresponds to the first pipe section 104.

[0060] It is understood that the first reinforcing section 102a is located at the end of the first tube 104 away from the second tube 105. The distal end of the first reinforcing section 102a is squeezed against the catheter seat 200. This part has the smallest thickness. The first reinforcing section 102a can effectively resist the radial force caused by the compression between the distal end and the catheter seat 200, thereby maintaining the integrity of the distal lumen of the introductory sheath 100, so that the instrument can smoothly enter the lumen of the microcatheter 300 from the introductory sheath 100.

[0061] Considering the thin wall thickness of the first tube segment 104, if the first tube segment 104 bends or deforms, it will cause the instrument's travel path to tilt. Since there is a step gap at the junction of the catheter hub 200 and the microcatheter 300, the instrument traveling along the tilted path may come into contact with the step, causing bending, accumulation, and damage. Therefore, it is necessary to ensure the straightness of the first tube segment 104, that is, to maintain the straightness of its internal delivery channel. The second reinforcing section 102b effectively resists bending deformation of the first tube segment 104, allowing the instrument to smoothly enter the lumen of the microcatheter 300 from the inlet sheath 100.

[0062] The sum of the lengths of the first reinforcing section 102a and the second reinforcing section 102b along the axial direction of the inlet sheath 100 is less than or equal to the length of the first tube section 104 along the axial direction of the inlet sheath 100.

[0063] When the sum of the lengths of the first reinforcing section 102a and the second reinforcing section 102b along the axial direction of the inlet sheath 100 is equal to the axial length of the inlet sheath 100 of the first tube segment 104, the boundary line L2 between the second reinforcing section 102b and the third reinforcing section 102c coincides with the boundary line L3 between the first tube segment 104 and the second tube segment 105. The third reinforcing section 102c is located in the second tube segment 105, and the length of the third reinforcing section 102c along the axial direction of the inlet sheath 100 is the same as the length of the second tube segment 105 along the axial direction of the inlet sheath 100. That is, the portion where the third reinforcing section 102c is located corresponds to the second tube segment 105. The second tube segment 105 has good flexibility in the radial direction and can be bent to accommodate the coil.

[0064] When the sum of the lengths of the first reinforcing segment 102a and the second reinforcing segment 102b along the axial direction of the inlet sheath 100 is less than the axial length of the inlet sheath 100 of the first tube segment 104, the boundary line L2 between the second reinforcing segment 102b and the third reinforcing segment 102c is located between the boundary line L3 between the first tube segment 104 and the second tube segment 105 and the boundary line L1 between the first reinforcing segment 102a and the second reinforcing segment 102b. The length of the third reinforcing segment 102c along the axial direction of the inlet sheath 100 is greater than the length of the second tube segment 105 along the axial direction of the inlet sheath 100, and part of the third reinforcing segment 102c is located in the second tube segment 105 and the other part is located in the first tube segment 104.

[0065] Specifically, the length of the first reinforcing segment 102a along the axial direction of the inlet sheath 100 is 1mm to 5mm. The length of the first reinforcing segment 102a along the axial direction of the inlet sheath 100 needs to ensure the integrity of the distal inner cavity of the inlet sheath 100. However, since the first reinforcing segment 102a does not have a through groove, its length along the axial direction of the inlet sheath 100 should not be too long; otherwise, it would be difficult to guarantee the bonding reliability between the inner tube 101 and the reinforcing layer 102 at the distal end of the inlet sheath 100.

[0066] The second reinforcing section 102b has a length of 20mm to 40mm along the axial direction of the inlet sheath 100. The wall thickness of the first tube section 104 gradually decreases from the proximal end to the distal end. To ensure that the first tube section 104 can effectively resist bending deformation, the length of the second reinforcing section 102b along the axial direction of the inlet sheath 100 cannot be too short. The second reinforcing section 102b can extend from its connection end with the first reinforcing section 102a to the boundary position between the first tube section 104 and the second tube section 105, thereby not affecting the bending of the second tube section 105.

[0067] The lengths of the third reinforcing section 102c and the second tube section 105 along the axial direction of the inlet sheath 100 can be adaptively adjusted according to the needs of conveying instruments such as spring coils or supports, and this application does not impose specific limitations on this.

[0068] To further reduce the distal outer diameter of the inlet sheath 100, thereby reducing the distance between the inlet sheath 100 and the microcatheter 300, the distal end of the first reinforcing segment 102a extends beyond the distal end of the outer tube 103 in the proximal-to-distal direction, while the distal end of the second reinforcing segment 102b does not extend beyond the distal end of the outer tube 103.

[0069] In this embodiment, the reinforcing layer 102 and the proximal ends of the outer tube 103 are flush. The length of the reinforcing layer 102 along the axial direction of the inlet sheath 100 is greater than the length of the outer tube 103 along the axial direction of the inlet sheath 100, and the difference in length between the two is less than or equal to the length of the first reinforcing segment 102a along the axial direction of the inlet sheath 100, meaning that the first reinforcing segment 102a is at least partially directly exposed. Specifically, the outer tube 103 is removed at the distal end of the inlet sheath 100 by laser ablation. After the outer tube 103 is removed, the reinforcing layer 102 of the tube segment is directly exposed, thereby reducing the outer diameter of this portion.

[0070] In summary, the inlet sheath 100 of this utility model adopts a three-layer structure. The middle reinforcing layer 102 improves the structural strength of the inlet sheath 100, the first reinforcing section 102a maintains the integrity of the distal inner cavity of the inlet sheath 100, and the second reinforcing section 102b improves the radial support force of the inlet sheath 100 and achieves a stable connection of the three-layer structure.

[0071] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0072] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. All equivalent embodiments or modifications made without departing from the spirit of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. An inlet sheath (100), characterized in that, include: Inner tube (101), outer tube (103) and reinforcing layer (102) located between the inner tube (101) and the outer tube (103); The reinforcing layer (102) includes a first reinforcing section (102a) and a second reinforcing section (102b) connected to the proximal end of the first reinforcing section (102a). The second reinforcing section (102b) is provided with a first through groove (102b-1) extending axially along the inlet sheath (100).

2. The inlet sheath (100) according to claim 1, characterized in that: The second reinforcing section (102b) is provided with a plurality of first hollow areas (102b-2) arranged along the axial direction of the inlet sheath (100), and each of the first hollow areas (102b-2) is provided with a plurality of first through grooves (102b-1) arranged along the circumference of the inlet sheath (100).

3. The inlet sheath (100) according to claim 2, characterized in that: The first through grooves (102b-1) in the first hollow area (102b-2) are evenly arranged along the circumference of the inlet sheath (100); Alternatively, the first through grooves (102b-1) in two adjacent first hollow areas (102b-2) are staggered; Alternatively, the first through grooves (102b-1) in two adjacent first hollow areas (102b-2) are aligned.

4. The inlet sheath (100) according to claim 1, characterized in that: The reinforcing layer (102) further includes a third reinforcing section (102c) connected to the proximal end of the second reinforcing section (102b), the third reinforcing section (102c) being provided with a second through groove (102c-1) extending circumferentially along the inlet sheath (100).

5. The inlet sheath (100) according to claim 4, characterized in that: The third reinforcing section (102c) is provided with a plurality of second hollow areas (102c-2) arranged along the axial direction of the inlet sheath (100), and each of the second hollow areas (102c-2) is provided with a plurality of second through grooves (102c-1) arranged along the circumference of the inlet sheath (100).

6. The inlet sheath (100) according to claim 5, characterized in that: The second through grooves (102c-1) in the second hollow area (102c-2) are evenly arranged along the circumference of the inlet sheath (100); Alternatively, the second through slots (102c-1) in two adjacent second hollow areas (102c-2) may be staggered. Alternatively, the second through grooves (102c-1) in two adjacent second hollow areas (102c-2) are aligned.

7. The inlet sheath (100) according to claim 4, characterized in that: The perforation rate of the second reinforcing section (102b) is less than that of the third reinforcing section (102c).

8. The inlet sheath (100) according to claim 1, characterized in that: In the direction from proximal to distal, the distal end of the first reinforcing segment (102a) extends beyond the distal end of the outer tube (103), while the distal end of the second reinforcing segment (102b) does not extend beyond the distal end of the outer tube (103).

9. The inlet sheath (100) according to claim 1, characterized in that: The length of the first reinforcing section (102a) along the axial direction of the inlet sheath (100) is 1mm to 5mm, and the length of the second reinforcing section (102b) along the axial direction of the inlet sheath (100) is 20mm to 40mm.

10. The inlet sheath (100) according to any one of claims 1 to 9, characterized in that: The inlet sheath (100) includes a first tube segment (104) and a second tube segment (105) connected to the proximal end of the first tube segment (104). The thickness of the outer tube (103) of the first tube segment (104) gradually decreases from the proximal end to the distal end. The first reinforced section (102a) and the second reinforced section (102b) are located in the first pipe section (104).

11. The inlet sheath (100) according to claim 10, characterized in that: The sum of the lengths of the first reinforcing section (102a) and the second reinforcing section (102b) along the axial direction of the inlet sheath (100) is less than or equal to the length of the first tube section (104) along the axial direction of the inlet sheath (100).

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