Medical guide sheath tube

Abstract

The utility model discloses a medical guide sheath tube, which comprises a lining layer, the reinforcing layer wraps the lining layer; the sheath layer wraps the reinforcing layer; the stay wire pipe is arranged between the lining layer and the reinforcing layer; a tab in a distal end portion of the sheath layer and joined to the sheath layer; and the stay wire penetrates through the stay wire tube, one end of the stay wire is connected with the pull ring, and the other end is led out from the near-end part of the sheath layer. The sheath layer is provided with a controllable bending part adjacent to the far-end part of the sheath layer, the controllable bending part can be bent under the pulling of the pull wire, the controllable bending part comprises a plurality of sheath sections which are connected in series in the axial direction of the medical sheath catheter, and the end faces of every two adjacent sheath sections are matched with each other and are inclined end faces which are inclined relative to the axial direction. According to the medical guide sheath tube, the matching end face between the sheath sections is the inclined end face which is inclined relative to the axial direction of the medical guide sheath tube instead of the vertical end face which is vertical to the axial direction, so that the medical guide sheath tube can be effectively prevented from generating wrinkles in a bending area, and the controllability of the medical guide sheath tube is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of medical guide sheath tube, which can be used for the implantation or repair surgery of human heart valve. BACKGROUND

[0002] In the prior art, the medical guide sheath tube generally includes an inner liner, a pull wire tube, a pull wire, a reinforcing layer, a pull ring and a sheath layer. The reinforcing layer wraps the inner liner, the sheath layer wraps the reinforcing layer, the pull wire tube is disposed between the inner liner and the reinforcing layer, and the pull wire passes through the pull wire tube and is connected to the pull ring. The pull ring is located in the distal end portion of the sheath layer and is joined to the distal end portion of the sheath layer. The sheath layer has a controllable bend portion adjacent to the distal end portion thereof, which includes a plurality of sheath segments, and the end faces of both ends of each sheath segment are perpendicular to the axial direction of the medical guide sheath tube. The controllable bend portion of the sheath layer can be bent under the pulling of the pull wire, so that the distal end of the medical guide sheath tube can be bent. However, the existing medical guide sheath tube is prone to wrinkles in the bending area, which affects the controllability of the medical guide sheath tube. SUMMARY

[0003] The utility model aims to solve at least one aspect of the above-mentioned problems and defects existing in the prior art.

[0004] According to one aspect of the utility model, a medical guide sheath tube is provided. The medical guide sheath tube includes an inner liner, a reinforcing layer wrapping the inner liner, a sheath layer wrapping the reinforcing layer, a pull wire tube disposed between the inner liner and the reinforcing layer, a pull ring located in the distal end portion of the sheath layer and joined to the sheath layer, and a pull wire passing through the pull wire tube and connected to the pull ring at one end and drawn out from the proximal end portion of the sheath layer at the other end. The sheath layer has a controllable bend portion adjacent to the distal end portion thereof, which can be bent under the pulling of the pull wire, and the controllable bend portion includes a plurality of sheath segments connected in series in the axial direction of the medical guide sheath tube, the end faces of adjacent two sheath segments cooperate with each other and are inclined end faces inclined to the axial direction,

[0005] According to one exemplary embodiment of the utility model, the hardness of the plurality of sheath segments gradually decreases from the proximal end portion of the sheath layer toward the distal end portion of the sheath layer, so that the flexibility of the controllable bend portion of the sheath layer gradually increases from the proximal end portion toward the distal end portion.

[0006] According to another exemplary embodiment of the present application, the sheath section includes a first sheath section closest to a distal end portion of the sheath layer, a second sheath section closest to a proximal end portion of the sheath layer, and at least one third sheath section between the first sheath section and the second sheath section; one end face of the third sheath section is an inclined end face inclined at a first angle relative to the axial direction, the other end face of the third sheath section is an inclined end face inclined at a second angle relative to the axial direction, and the sum of the first angle and the second angle is equal to 90 degrees.

[0007] According to another exemplary embodiment of the present application, the controllable bending portion includes a plurality of third sheath sections, and the plurality of third sheath sections are completely identical in size and shape.

[0008] According to another exemplary embodiment of the present application, the sheath section has a first side longest in the axial direction and a second side shortest in the axial direction, the first side and the second side are opposite in the radial direction of the medical guide sheath tube, and the first side of the second sheath section is adjacent to and faces the pull wire tube.

[0009] According to another exemplary embodiment of the present application, the hardness of the plurality of sheath sections of the controllable bending portion gradually decreases from the proximal end portion of the sheath layer to the distal end portion of the sheath layer, so that the flexibility of the controllable bending portion of the sheath layer gradually increases from the proximal end portion to the distal end portion; the hardness of the proximal end portion of the sheath layer is greater than the hardness of the second sheath section, and the hardness of the first sheath section is greater than the hardness of the distal end portion of the sheath layer.

[0010] According to another exemplary embodiment of the present application, one end face of the first sheath section is an inclined end face inclined at the first angle or the second angle relative to the axial direction, and the other end face of the first sheath section is a perpendicular end face perpendicular to the axial direction; the inclined end face of the first sheath section cooperates with one inclined end face of the third sheath section, and the distal end portion of the sheath layer has a first perpendicular end face cooperating with the perpendicular end face of the first sheath section.

[0011] According to another exemplary embodiment of the present application, one end face of the first sheath section is an inclined end face inclined at the first angle relative to the axial direction, and the other end face of the first sheath section is an inclined end face inclined at the second angle relative to the axial direction; and one inclined end face of the first sheath section cooperates with one inclined end face of the third sheath section, and the distal end portion of the sheath layer has a first inclined end face cooperating with the other inclined end face of the first sheath section.

[0012] According to another exemplary embodiment of the present application, one end face of the second sheath segment is an inclined end face inclined at the first angle relative to the axial direction, and the other end face of the second sheath segment is a perpendicular end face perpendicular to the axial direction; the inclined end face of the second sheath segment cooperates with one inclined end face of the third sheath segment, and the proximal end portion of the sheath layer has a second perpendicular end face cooperating with the perpendicular end face of the second sheath segment.

[0013] According to another exemplary embodiment of the present application, one end face of the second sheath segment is an inclined end face inclined at the first angle relative to the axial direction, and the other end face of the second sheath segment is a perpendicular end face perpendicular to the axial direction; the inclined end face of the second sheath segment cooperates with one inclined end face of the third sheath segment, and the proximal end portion of the sheath layer has a second perpendicular end face cooperating with the perpendicular end face of the second sheath segment.

[0014] According to another exemplary embodiment of the present application, the reinforcing layer extends to the rear end of the distal end portion of the sheath layer, and the pull ring is located outside the reinforcing layer and axially abuts against the front end face of the reinforcing layer.

[0015] According to another exemplary embodiment of the present application, a lead hole is formed on the reinforcing layer and the proximal end portion of the sheath layer to allow the pull wire to be led out, the pull wire tube extends from the rear end of the distal end portion of the sheath layer to the lead hole, and the pull wire is led out from the lead hole.

[0016] According to another exemplary embodiment of the present application, the medical guide sheath tube further comprises a heat shrink tube sleeved and heat shrunk on the sheath layer to heat shrink the sheath layer, the reinforcing layer, the pull wire tube and the inner lining layer together, and the proximal end portion, the distal end portion and the controllable bending portion of the sheath layer are axially connected together through the heat shrink tube.

[0017] According to another exemplary embodiment of the present application, the inner lining layer is a flexible layer made of polytetrafluoroethylene, and the reinforcing layer is a metal wire braided layer or a serpentine flexible metal tube.

[0018] According to another exemplary embodiment of the present application, the proximal end portion of the sheath layer, the plurality of sheath segments of the controllable bending portion of the sheath layer and the distal end portion of the sheath layer are respectively formed by polymers with different hardness; the proximal end portion of the sheath layer has the maximum hardness, the distal end portion of the sheath layer has the minimum hardness, and the plurality of sheath segments of the controllable bending portion of the sheath layer gradually decrease in hardness from the proximal end portion to the distal end portion.

[0019] In the foregoing exemplary embodiments of the present invention, the mating end faces between the controllable bending portions of the sheath layer of the medical guide sheath are inclined end faces that are inclined to the axial direction of the medical guide sheath, rather than vertical end faces that are perpendicular to the axial direction of the medical guide sheath. This effectively prevents wrinkles from forming in the bending area of ​​the medical guide sheath and improves the controllability of the medical guide sheath.

[0020] Other objects and advantages of the present invention will become apparent from the following description of the invention with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the invention. Attached Figure Description

[0021] Figure 1 This diagram shows a perspective view of a medical sheath tube according to an exemplary embodiment of the present invention.

[0022] Figure 2 This shows a radial cross-sectional view of a medical guide sheath according to an exemplary embodiment of the present invention;

[0023] Figure 3 This shows an axial cross-sectional view of a medical guide sheath according to an exemplary embodiment of the present invention;

[0024] Figure 4 This diagram shows an exploded view of a medical sheath according to an exemplary embodiment of the present invention.

[0025] Figure 5 This is a perspective view of the sheath layer of a medical guide sheath according to an exemplary embodiment of the present invention;

[0026] Figure 6 This diagram shows an exploded view of the sheath layer of a medical sheath according to an exemplary embodiment of the present invention.

[0027] Figure 7 This is an exploded planar schematic diagram of the sheath layer of a medical sheath tube according to an exemplary embodiment of the present invention.

[0028] Figure 8 This diagram shows an exploded planar view of the sheath layer of a medical sheath according to another exemplary embodiment of the present invention.

[0029] Figure 9 show Figure 8 A schematic diagram of the sheath layer of a medical catheter shown;

[0030] Figure 10 This diagram shows an exploded planar view of the sheath layer of a medical sheath according to another exemplary embodiment of the present invention.

[0031] Figure 11Display Figure 10 A plan view of a sheath layer of a medical guide sheath tube. DETAILED DESCRIPTION

[0032] The technical solutions of the present application will be further described below in conjunction with the drawings. In the description, identical or similar reference numerals indicate identical or similar components. The following description of the embodiments of the present application with reference to the drawings is intended to explain the general inventive concept of the present application and should not be construed as a limitation of the present application.

[0033] In addition, in the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. It will be apparent, however, that one or more embodiments can be practiced without these specific details. In other instances, well-known structures and devices are not described in detail in order to simplify the drawings.

[0034] According to one general inventive concept, a medical guide sheath tube is provided. The medical guide sheath tube comprises: an inner liner; a reinforcing layer wrapping the inner liner; a sheath layer wrapping the reinforcing layer; a pull wire tube disposed between the inner liner and the reinforcing layer; a pull ring located in a distal end portion of the sheath layer and joined to the sheath layer; and a pull wire passing through the pull wire tube and having one end connected to the pull ring and the other end drawn out from a proximal end portion of the sheath layer. The sheath layer has a controllable bending portion adjacent to the distal end portion thereof, the controllable bending portion being capable of bending under pulling of the pull wire, the controllable bending portion comprising a plurality of sheath segments connected in series in an axial direction of the medical guide sheath tube, end faces of adjacent two sheath segments being matched with each other and being oblique end faces oblique to the axial direction.

[0035] Figure 1 A perspective view of a medical guide sheath tube according to an exemplary embodiment of the present application is shown; Figure 2 A radial cross-sectional view of a medical guide sheath tube according to an exemplary embodiment of the present application is shown; Figure 3 An axial cross-sectional view of a medical guide sheath tube according to an exemplary embodiment of the present application is shown; Figure 4 An exploded view of a medical guide sheath tube according to an exemplary embodiment of the present application is shown; Figure 5 A perspective view of a sheath layer 3 of a medical guide sheath tube according to an exemplary embodiment of the present application is shown; Figure 6 An exploded view of a sheath layer 3 of a medical guide sheath tube according to an exemplary embodiment of the present application is shown; Figure 7 A plan view of a sheath layer 3 of a medical guide sheath tube according to an exemplary embodiment of the present application is shown.

[0036] As Figures 1 to 7 shown in the figure, in one exemplary embodiment of the present application, a medical guide sheath is disclosed. The medical guide sheath comprises: an inner liner 1, a reinforcing layer 2, a sheath layer 3, a pull wire tube 4, a pull ring 5 and a pull wire 6. The reinforcing layer 2 wraps the inner liner 1. The sheath layer 3 wraps the reinforcing layer 2. The pull wire tube 4 is arranged between the inner liner 1 and the reinforcing layer 2. The pull ring 5 is located in a distal end portion 31 of the sheath layer 3 and is joined to the sheath layer 3. The pull wire 6 passes through the pull wire tube 4 and one end of the pull wire 6 is connected to the pull ring 5, and the other end of the pull wire 6 is led out from a proximal end portion 32 of the sheath layer 3. The sheath layer 3 has a controllable bending portion 33 adjacent to the distal end portion 31 of the sheath layer 3, and the controllable bending portion 33 is capable of bending under the pulling of the pull wire 6. The controllable bending portion 33 comprises a plurality of sheath segments 30 connected in series in the axial direction of the medical guide sheath, and the end faces of adjacent two sheath segments 30 are matched with each other and are inclined end faces 30a inclined to the axial direction of the medical guide sheath.

[0037] As Figures 1 to 7 shown in the figure, in the illustrated embodiment, the hardness of the plurality of sheath segments 30 gradually decreases from the proximal end portion 32 of the sheath layer 3 towards the distal end portion 31 of the sheath layer 3, so that the flexibility of the controllable bending portion 33 of the sheath layer 3 gradually increases from the proximal end portion 32 to the distal end portion 31.

[0038] As Figures 1 to 7 shown in the figure, in the illustrated embodiment, the sheath segment 30 comprises a first sheath segment 301 closest to the distal end portion 31 of the sheath layer 3, a second sheath segment 302 closest to the proximal end portion 32 of the sheath layer 3, and at least one third sheath segment 303 located between the first sheath segment 301 and the second sheath segment 302. One end face of the third sheath segment 303 is an inclined end face 30a inclined to the axial direction by a first angle α, the other end face of the third sheath segment 303 is an inclined end face 30a inclined to the axial direction by a second angle β, and the sum of the first angle α and the second angle β is equal to 180 degrees.

[0039] As Figures 1 to 7 shown in the figure, in the illustrated embodiment, the controllable bending portion 33 comprises a plurality of third sheath segments 303, and the plurality of third sheath segments 303 are completely identical in size and shape. In this way, the number of manufacturing molds can be reduced, thereby being able to reduce the manufacturing cost.

[0040] As Figures 1 to 7 shown in the figure, in the illustrated embodiment, the sheath segment 30 has a first side 30c which is the longest in the axial direction and a second side 30d which is the shortest in the axial direction, the first side 30c and the second side 30d are opposite to each other in the radial direction of the medical guide sheath, and the first side 30c of the second sheath segment 302 is adjacent to and faces the pull wire tube 4.

[0041] As Figures 1 to 7As shown in the illustrated embodiment, the hardness of the plurality of sheath segments 30 of the controllable bending portion 33 gradually decreases from the proximal portion 32 of the sheath layer 3 towards the distal portion 31 of the sheath layer 3, thereby gradually increasing the flexibility of the controllable bending portion 33 of the sheath layer 3 from the proximal portion 32 to the distal portion 31. The hardness of the proximal portion 32 of the sheath layer 3 is greater than the hardness of the second sheath segment 302, and the hardness of the first sheath segment 301 is greater than the hardness of the distal portion 31 of the sheath layer 3.

[0042] like Figures 1 to 7 As shown in the illustrated embodiment, one end face of the first sheath segment 301 is an inclined end face 30a tilted at a first angle α or a second angle β relative to the axial direction, and the other end face of the first sheath segment 301 is a vertical end face 30b perpendicular to the axial direction. The inclined end face 30a of the first sheath segment 301 mates with an inclined end face 30a of the third sheath segment 303, and the distal portion 31 of the sheath layer 3 has a first vertical end face 31b that mates with the vertical end face 30b of the first sheath segment 301.

[0043] Figure 8 This diagram shows an exploded planar view of the sheath layer 3 of a medical sheath tube according to another exemplary embodiment of the present invention. Figure 9 show Figure 8 The diagram shows a planar schematic of the sheath layer 3 of the medical guide sheath.

[0044] Figure 8 and Figure 9 The medical sheath shown Figures 1 to 7 The only difference between the medical sheaths shown is the structure of the first sheath section 301. For example... Figure 8 and Figure 9 As shown in the illustrated embodiment, one end face of the first sheath segment 301 is an inclined end face 30a tilted at a first angle α relative to the axial direction, and the other end face of the first sheath segment 301 is an inclined end face 30a tilted at a second angle β relative to the axial direction. One inclined end face 30a of the first sheath segment 301 mates with one inclined end face 30a of the third sheath segment 303, and the distal portion 31 of the sheath layer 3 has a first inclined end face 31a that mates with the other inclined end face 30a of the first sheath segment 301.

[0045] like Figures 1 to 7 As shown in the illustrated embodiment, one end face of the second sheath segment 302 is an inclined end face 30a that is tilted at a first angle α relative to the axial direction, and the other end face of the second sheath segment 302 is an inclined end face 30a that is tilted at a second angle β relative to the axial direction. The proximal portion 32 of the sheath layer 3 has a second inclined end face 32a that mates with one inclined end face 30a of the second sheath segment 302.

[0046] Figure 10A planar exploded schematic view of the sheath layer 3 of the medical guide sheath tube according to another exemplary embodiment of the present application is shown. Figure 11 A planar schematic view of the sheath layer 3 of the medical guide sheath tube is shown. Figure 10 A planar schematic view of the sheath layer 3 of the medical guide sheath tube is shown.

[0047] Figure 10 Figure 11 The medical guide sheath tube shown in Figure 8 Figure 9 The difference between the medical guide sheath tube shown in Figure 10 Figure 11 In the illustrated embodiment, one end face of the second sheath segment 302 is an inclined end face 30a inclined at a first angle a or a second angle β relative to the axial direction, and the other end face of the second sheath segment 302 is a perpendicular end face 30b perpendicular to the axial direction, as shown in

[0048] In the illustrated embodiment, the reinforcing layer 2 extends to the rear end of the distal end portion 31 of the sheath layer 3, and the pull ring 5 is located outside the reinforcing layer 2 and axially abuts against the front end face of the reinforcing layer 2, as shown in Figures 1 to 10

[0049] In the illustrated embodiment, a lead hole 3a is formed in the reinforcing layer 2 and the proximal end portion 32 of the sheath layer 3 to allow the pull wire 6 to be led out, the pull wire tube 4 extends from the rear end of the distal end portion 31 of the sheath layer 3 to the lead hole 3a, and the pull wire 6 is led out from the lead hole 3a, as shown in Figures 1 to 10

[0050] In the illustrated embodiment, the medical guide sheath tube further comprises a heat shrink tube (not shown) sleeved and heat shrunk on the sheath layer 3 to heat shrink the sheath layer 3, the reinforcing layer 2, the pull wire tube 4 and the inner liner layer 1 together. The proximal end portion 32, the distal end portion 31 and the controllable bending portion 33 of the sheath layer 3 are axially connected in series via the heat shrink tube, as shown in Figures 1 to 10

[0051] In the illustrated embodiment, the inner liner layer 1 can be a flexible layer made of polytetrafluoroethylene, and the reinforcing layer 2 can be a metal wire braided layer or a serpentine flexible metal tube, as shown in Figures 1 to 10

[0052] Figures 1 to 10 ​​​​​​​​As shown, in the illustrated embodiment, the proximal portion 32 of the sheath layer 3, the plurality of sheath segments 30 of the controllable bend portion 33 of the sheath layer 3, and the distal portion 31 of the sheath layer 3 are formed of different hardnesses of polymer, respectively. The proximal portion 32 of the sheath layer 3 is formed of the hardest polymer, the distal portion 31 of the sheath layer 3 is formed of the softest polymer, and the plurality of sheath segments 30 of the controllable bend portion 33 of the sheath layer 3 are formed of progressively softer polymers from the proximal portion 32 to the distal portion 31.

[0053] The present utility model aims to design the bending area of the sheath layer 3 as an asymmetric structure, so that the outer side of the bending area of the sheath layer 3 is more easily stretched, while the inner side is more easily contracted. Through this novel design, the risk of wrinkles occurring in the bending area of the medical guide sheath tube can be minimized. The controllable bend portion of the sheath layer of the present utility model smoothly transitions from hard to soft, which will help better steering performance and prevent any sudden and uneven deformation. In addition, the present utility model can make the turning radius smaller without changing the outer shape size of the medical guide sheath tube. The scheme of the present utility model can be implemented without greatly changing the existing manufacturing process, has cost advantage and is suitable for mass production.

[0054] Those skilled in the art can understand that the above-described embodiments are exemplary, and those skilled in the art can make improvements, and the structures described in various embodiments can be freely combined without structural or principle conflicts, and these changes shall fall within the protection scope of the present utility model.

[0055] Although the present utility model has been described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplarily illustrate the preferred embodiments of the present utility model, and cannot be understood as a limitation of the present utility model.

[0056] Although some embodiments of the general concept of the present utility model have been shown and described, those skilled in the art will understand that changes can be made to these embodiments without departing from the principles and spirit of the general concept of the present utility model, and the scope of the present utility model is limited by the claims and their equivalents.

[0057] It should be noted that the wording "comprising" does not exclude other elements or steps, and the wording "a" or "one" does not exclude a plurality. In addition, any element reference of the claims should not be understood as limiting the scope of the present utility model.

Claims

1. A medical guide sheath tube characterized by comprising: Comprising: an inner layer (1); a reinforcing layer (2) wrapping the inner layer (1); a sheath layer (3) wrapping the reinforcing layer (2); a pull wire tube (4) disposed between the inner layer (1) and the reinforcing layer (2); a pull ring (5) located in a distal end portion (31) of the sheath layer (3) and being joined to the sheath layer (3); and a pull wire (6) passing through the pull wire tube (4) and having one end connected to the pull ring (5) and the other end drawn out from a proximal end portion (32) of the sheath layer (3), the sheath layer (3) having a controllable bending portion (33) adjacent to the distal end portion (31) of the sheath layer (3), the controllable bending portion (33) being capable of bending under the pulling of the pull wire (6), the controllable bending portion (33) comprising a plurality of sheath segments (30) connected in series in the axial direction of the medical catheter tube, the end faces of adjacent two sheath segments (30) being matched with each other and being oblique end faces (30a) inclined to the axial direction, 2. The medical catheter tube according to claim 1, wherein: the hardness of the plurality of sheath segments (30) gradually decreases from the proximal end portion (32) of the sheath layer (3) toward the distal end portion (31) of the sheath layer (3), so that the flexibility of the controllable bending portion (33) of the sheath layer (3) gradually increases from the proximal end portion (32) toward the distal end portion (31).

3. The medical catheter tube according to claim 1, wherein: the sheath segments (30) comprise a first sheath segment (301) closest to the distal end portion (31) of the sheath layer (3), a second sheath segment (302) closest to the proximal end portion (32) of the sheath layer (3), and at least one third sheath segment (303) between the first sheath segment (301) and the second sheath segment (302); one end face of the third sheath segment (303) is an oblique end face (30a) inclined to the axial direction by a first angle (a), the other end face of the third sheath segment (303) is an oblique end face (30a) inclined to the axial direction by a second angle (β), and the sum of the first angle (a) and the second angle (β) is equal to 180 degrees.

4. The medical catheter tube according to claim 3, wherein: the controllable bending portion (33) comprises a plurality of third sheath segments (303), and the plurality of third sheath segments (303) are completely identical in size and shape.

5. The medical catheter tube according to claim 3, wherein: the sheath segments (30) have a first side (30c) longest in the axial direction and a second side (30d) shortest in the axial direction, the first side (30c) and the second side (30d) are opposite in the radial direction of the medical catheter tube, and the first side (30c) of the second sheath segment (302) is adjacent to and faces the pull wire tube (4).

6. The medical catheter tube according to claim 3, wherein: The hardness of the plurality of sheath segments (30) of the controllable bending portion (33) gradually decreases from the proximal portion (32) of the sheath layer (3) toward the distal portion (31) of the sheath layer (3), so that the flexibility of the controllable bending portion (33) of the sheath layer (3) gradually increases from the proximal portion (32) to the distal portion (31); The hardness of the proximal portion (32) of the sheath layer (3) is greater than the hardness of the second sheath segment (302), and the hardness of the first sheath segment (301) is greater than the hardness of the distal portion (31) of the sheath layer (3).

7. The medical catheter tube according to claim 3, wherein: One end face of the first sheath segment (301) is an inclined end face (30a) inclined at the first angle (a) or the second angle (b) with respect to the axial direction, and the other end face of the first sheath segment (301) is a perpendicular end face (30b) perpendicular to the axial direction; The inclined end face (30a) of the first sheath segment (301) cooperates with one inclined end face (30a) of the third sheath segment (303), and the distal portion (31) of the sheath layer (3) has a first perpendicular end face (31b) cooperating with the perpendicular end face (30b) of the first sheath segment (301).

8. The medical catheter tube according to claim 3, wherein: One end face of the first sheath segment (301) is an inclined end face (30a) inclined at the first angle (a) with respect to the axial direction, and the other end face of the first sheath segment (301) is an inclined end face (30a) inclined at the second angle (b) with respect to the axial direction; and One inclined end face (30a) of the first sheath segment (301) cooperates with one inclined end face (30a) of the third sheath segment (303), and the distal portion (31) of the sheath layer (3) has a first inclined end face (31a) cooperating with the other inclined end face (30a) of the first sheath segment (301).

9. The medical catheter tube according to any one of claims 3 to 8, wherein: One end face of the second sheath segment (302) is an inclined end face (30a) inclined at the first angle (a) with respect to the axial direction, the other end face of the second sheath segment (302) is an inclined end face (30a) inclined at the second angle (b) with respect to the axial direction, and the proximal portion (32) of the sheath layer (3) has a second inclined end face (32a) cooperating with one inclined end face (30a) of the second sheath segment (302).

10. The medical catheter tube according to any one of claims 3 to 8, wherein: One end face of the second sheath segment (302) is an inclined end face (30a) inclined at the first angle (a) or the second angle (b) with respect to the axial direction, and the other end face of the second sheath segment (302) is a perpendicular end face (30b) perpendicular to the axial direction; The oblique end face (30a) of the second sheath segment (302) cooperates with one oblique end face (30a) of the third sheath segment (303), and the proximal end portion (32) of the sheath layer (3) has a second vertical end face (32b) cooperating with the vertical end face (30b) of the second sheath segment (302).

11. The medical guide sheath tube according to claim 1, characterized in that: The reinforcing layer (2) extends to the rear end of the distal end portion (31) of the sheath layer (3), and the pull ring (5) is located outside the reinforcing layer (2) and axially abuts against the front end face of the reinforcing layer (2).

12. The medical guide sheath tube according to claim 1, characterized in that: The pull wire hole (3a) allowing the pull wire (6) to exit is formed on the reinforcing layer (2) and the proximal end portion (32) of the sheath layer (3), the pull wire tube (4) extends from the rear end of the distal end portion (31) of the sheath layer (3) to the pull wire hole (3a), and the pull wire (6) exits from the pull wire hole (3a).

13. The medical introducer sheath of claim 1, wherein, Further comprising: The heat shrink tube is sleeved and heat shrunk on the sheath layer (3) to heat shrink the sheath layer (3), the reinforcing layer (2), the pull wire tube (4) and the inner lining layer (1) together, The proximal end portion (32), the distal end portion (31) and the controllable bending portion (33) of the sheath layer (3) are axially connected in series via the heat shrink tube.

14. The medical guide sheath tube according to claim 1, characterized in that: The inner lining layer (1) is a flexible layer made of polytetrafluoroethylene, and the reinforcing layer (2) is a metal wire braided layer or a serpentine flexible metal tube.

15. The medical guide sheath tube according to claim 1, characterized in that: The proximal end portion (32) of the sheath layer (3), the plurality of sheath segments (30) of the controllable bending portion (33) of the sheath layer (3) and the distal end portion (31) of the sheath layer (3) are respectively formed by polymers with different hardnesses; The hardness of the proximal end portion (32) of the sheath layer (3) is the largest, the hardness of the distal end portion (31) of the sheath layer (3) is the smallest, and the hardness of the plurality of sheath segments (30) of the controllable bending portion (33) of the sheath layer (3) gradually decreases from the proximal end portion (32) to the distal end portion (31).

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