Guide sheath as well as expansion tube and guide structure thereof

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to a guide sheath and an expansion tube and a guide structure thereof. An expansion tube of the guide sheath comprises a first tube section and a second tube section which are communicated with each other, the far end of the first tube section is connected with the near end of the second tube section, the near end of the first tube section is used for being in butt joint with a connecting tube of the guide sheath, and the first tube section is provided with a limiting part radially exceeding the second tube section. The limiting part is used for being matched with a first shell of the guide sheath in a limiting mode in the first direction, and the first direction is the direction extending from the first pipe section to the second pipe section. The limiting part of the first tube section can be in limiting fit with the first shell of the guide sheath in the direction extending from the first tube section to the second tube section, and when the expansion tube is specifically applied, the far end of the connecting tube is in butt joint with the near end of the first tube section; therefore, the first shell can limit the expansion pipe to move in the direction away from the connecting pipe, and the expansion pipe can be prevented from being separated from the connecting pipe under the action of external force.

Description

Technical Field

[0001] The present application belongs to the technical field of medical devices, and specifically relates to a guide sheath and its expansion tube and guide structure. Background Art

[0002] Guide sheaths are commonly used in urological endoscopic examinations or surgeries. They can establish an inspection / surgical channel in the urinary system to assist the endoscope and surgical instruments in passing through the urethra, ureter and other cavities, thereby improving the effectiveness and safety of examination and treatment.

[0003] In the related art, the guide sheath includes a first shell, an expansion tube and a connecting tube, the proximal end of the expansion tube is fixedly connected to the first shell, the distal end of the connecting tube is connected to the proximal end of the expansion tube, and the proximal end of the connecting tube extends to the docking joint of the first shell, through which surgical instruments can be inserted or effusion can be aspirated or a camera module can be inserted. However, when the guide sheath in the related art is used, the expansion tube is easily separated from the connecting tube. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a guide sheath and its expansion tube and guide structure, which can solve the problem in the related art that the expansion tube is easily separated from the connecting tube.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides an expansion tube of a guide sheath, comprising a first tube segment and a second tube segment that are connected to each other, wherein the distal end of the first tube segment is connected to the proximal end of the second tube segment, the proximal end of the first tube segment is used to dock and connect with a connecting tube of the guide sheath, the first tube segment has a limiting portion that radially exceeds the second tube segment, the limiting portion is used to cooperate with a first shell of the guide sheath in a first direction.

[0007] The first direction is a direction extending from the first pipe section to the second pipe section.

[0008] In the second aspect, an embodiment of the present application provides a guiding structure of a guide sheath, comprising at least one connecting tube and the above-mentioned expansion tube, wherein the expansion tube has at least one first working channel, the first working channel comprises a first hole segment and a second hole segment that are connected to each other, the first hole segment is arranged in the first tube segment, and the second hole segment is arranged in the second tube segment, the distal end of the connecting tube is connected to the proximal end of the expansion tube and is connected to the first hole segment.

[0009] In a third aspect, an embodiment of the present application provides a guide sheath, comprising a first shell and the above-mentioned guide structure, wherein the proximal end of the first tube segment extends into the first shell and is fixedly connected to the distal end of the first shell.

[0010] In an embodiment of the present application, the expansion tube includes a first tube segment and a second tube segment, the distal end of the first tube segment is connected to the proximal end of the second tube segment, the first tube segment has a limiting portion that radially extends beyond the second tube segment, and the limiting portion can cooperate with the first shell of the guide sheath to limit the direction extending from the first tube segment to the second tube segment. Under such a setting, the installation base of the expansion tube, that is, the first shell can limit the movement of the expansion tube along the first direction. When the expansion tube of the embodiment of the present application is specifically used, the distal end of the connecting tube is docked with the proximal end of the first tube segment, so the first shell can limit the movement of the expansion tube in the direction away from the connecting tube, thereby preventing the expansion tube from being separated from the connecting tube under the action of external force. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the guide sheath disclosed in the embodiment of the present application;

[0012] Figure 2 It is an exploded schematic diagram of the guide sheath disclosed in the embodiment of the present application and an enlarged schematic diagram of point A therein;

[0013] Figure 3 A cross-sectional view of a portion of the structure of the guide sheath disclosed in an embodiment of the present application and an enlarged schematic view of point B therein;

[0014] Figure 4 This is a schematic diagram of the structure of the expansion tube disclosed in the embodiment of the present application;

[0015] Figure 5 A cross-sectional view of the expansion tube disclosed in the embodiment of the present application;

[0016] Figure 6 to Figure 7 It is a schematic diagram of the structure of the fixing member disclosed in the embodiment of the present application at different viewing angles;

[0017] Figure 8 It is a cross-sectional view of the docking piece disclosed in the embodiment of the present application.

[0018] Description of reference numerals:

[0019] 100, expansion tube; 101, first working channel; 110, first tube section; 111, limiting portion; 112, first hole section; 120, second tube section; 121, second hole section; 130, groove; 200, connecting tube; 300, fixing piece; 310, through hole; 320, glue containing groove; 400, first shell; 410, shell body; 420, docking piece; 421, limiting hole; 500, second shell; 600, sheath. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0022] The guide sheath, dilation tube and guide structure provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in combination with the accompanying drawings.

[0023] In each embodiment of the present application, "proximal end" and "distal end" refer to the position of the introducer sheath and its components relative to the user in the use environment, wherein the end closer to the user is designated as the "proximal end" and the end farther from the user is designated as the "distal end".

[0024] The inventors discovered that in the related art, the proximal end of the expansion tube is bonded to the first shell, and the proximal end of the expansion tube is an equal-diameter structure. The first shell cannot limit the expansion tube, which will cause the expansion tube to have a tendency to move axially relative to the first shell when subjected to a pulling force, thereby causing the colloid between the expansion tube and the first shell to fail, and further causing the expansion tube to move in a direction away from the connecting tube, which will cause the expansion tube to separate from the connecting tube.

[0025] like Figures 2 to 5 As shown, the embodiment of the present application discloses a dilatation tube of a guide sheath, comprising a first tube segment 110 and a second tube segment 120 connected to each other, wherein the distal end of the first tube segment 110 is connected to the proximal end of the second tube segment 120, and the proximal end of the first tube segment 110 is used to dock and connect with the connecting tube 200 of the guide sheath, and the first tube segment 110 has a radial ( Figure 3 The direction indicated by the y arrow line in the middle) exceeds the limiting portion 111 of the second tube segment 120, and the limiting portion 111 is used to be aligned with the first housing 400 of the guide sheath in the first direction ( Figure 2 , 3The first direction is the direction extending from the first tube segment 110 to the second tube segment 120. It should be noted that the radial direction described in the present application refers to the direction perpendicular to the axis of the expansion tube 100, and the shape of the outer contour of the cross section of the guide sheath is not specifically limited to a circle, and it can also be a polygon, etc., and the present application does not limit this.

[0026] In the embodiment of the present application, the expansion tube 100 includes a first tube segment 110 and a second tube segment 120, the distal end of the first tube segment 110 is connected to the proximal end of the second tube segment 120, the first tube segment 110 has a limiting portion 111 that radially exceeds the second tube segment 120, and the limiting portion 111 can cooperate with the first shell 400 of the guide sheath to limit the direction extending from the first tube segment 110 to the second tube segment 120. Under such a setting, the installation base of the expansion tube 100, that is, the first shell 400 can limit the expansion tube 100 from moving in the first direction. When the expansion tube 100 of the embodiment of the present application is specifically used, the distal end of the connecting tube 200 is docked and connected to the proximal end of the first tube segment 110, so the first shell 400 can limit the expansion tube 100 from moving in a direction away from the connecting tube 200, thereby preventing the expansion tube 100 from separating from the connecting tube 200 under the action of external force.

[0027] In an alternative embodiment, see Figure 4 , 5 , the limiting portion 111 is annular and extends along the circumference of the first pipe segment 110, and the limiting portion 111 extends along the axial direction of the first pipe segment 110 to the proximal end face of the first pipe segment 110. Specifically, the shape of the limiting portion 111 can also be arc-shaped, cylindrical, etc., and the limiting portion 111 may not extend to the proximal end face of the first pipe segment 110, and the present application does not limit this. The limiting portion 111 of the present embodiment is in the shape of an annular shape extending along the circumference of the first pipe segment 110, and it extends to the proximal end face of the first pipe segment 110, that is, the proximal end of the first pipe segment 110 of the present embodiment is an enlarged structure, and all its parts in its own circumference radially exceed the second pipe segment 120, so that the contact area between the limiting portion 111 and the first shell 400 can be increased, thereby improving the limiting stability between the limiting portion 111 and the first shell 400.

[0028] In a further embodiment, the expansion tube 100 has at least one first working channel 101, and the first working channel 101 includes a first hole segment 112 and a second hole segment 121 that are connected to each other. The first hole segment 112 is arranged on the first tube segment 110, and the second hole segment 121 is arranged on the second tube segment 120. The cross-sectional area of ​​the proximal end of the first hole segment 112 of at least one first working channel 101 is greater than the cross-sectional area of ​​the corresponding second hole segment 121. In this embodiment, since the proximal end of the first tube segment 110 is enlarged, the cross-sectional area of ​​the proximal end of the first hole segment 112 provided in the first tube segment 110 can be enlarged accordingly while keeping the wall thickness of the first tube segment 110 unchanged. In this way, when the distal end of the connecting tube 200 is inserted into the proximal end of the first hole segment 112, the size of the distal end of the connecting tube 200 can be enlarged accordingly. That is to say, after adopting the structure of this embodiment, the size of the distal end of the connecting tube 200 can be enlarged accordingly, and then the cross-sectional area of ​​the inner hole of the distal end of the connecting tube 200 can be increased, so as to facilitate the insertion of surgical instruments, camera modules, or increase the efficiency of suctioning the accumulated fluid.

[0029] Alternatively, for further embodiments, see Figure 4 , 5 In the first direction, the length of the limiting portion 111 radially exceeding the second pipe segment 120 gradually decreases, that is, the cross-sectional area of ​​the limiting portion 111 gradually decreases, and the distance between the outer surface of the limiting portion 111 and the axis of the second pipe segment 120 also gradually decreases. At this time, the limiting portion 111 is an inclined wedge structure. In specific application, the inner wall of the limiting hole 421 in the first shell 400 described below can also be set as an inclined wedge surface adapted to the outer surface of the limiting portion 111. In this way, when the limiting portion 111 moves axially relative to the first shell 400, the limiting portion 111 will apply radial pressure to the inner wall of the limiting hole 421, so that the limiting portion 111 will self-lock after being subjected to force, which can further improve the limiting stability between the limiting portion 111 and the first shell 400; in addition, the length of the limiting portion 111 radially exceeding the second pipe segment 120 gradually decreases, and it is also convenient to axially assemble the limiting portion 111 into the first shell 400, thereby reducing the difficulty of assembly. Of course, in the first direction, the length of the limiting portion 111 radially exceeding the second pipe segment 120 may also remain unchanged or gradually increase, and the present application does not impose any limitation on this.

[0030] In an optional embodiment, the expansion tube 100 has a stopper portion, which can cooperate with the first shell 400 at the circumferential upper limit of the expansion tube 100, so as to prevent the expansion tube 100 from rotating relative to the first shell 400 after being assembled to the first shell 400, thereby preventing the connecting tube 200 from rotating with the expansion tube 100 after being fixedly connected to the expansion tube 100.

[0031] And / or, the expansion tube 100 has a first positioning structure, and the first positioning structure can cooperate with the second positioning structure of the first shell 400 to position the expansion tube 100 with the first shell 400. When the expansion tube 100 of this embodiment is specifically assembled on the first shell 400, the expansion tube 100 can be positioned with the first shell 400 through the cooperation between the first positioning structure and the second positioning structure, so that the expansion tube 100 is located in the correct position in the first shell 400, and then the docking accuracy between the connecting tube 200 and the expansion tube 100 can be improved, so as to achieve accurate docking between the connecting tube 200 and the expansion tube 100. It should be noted that, since the expansion tube 100 can be axially limited by the limiting portion 111 with the first shell 400, that is, the expansion tube 100 has been axially positioned with the first shell 400, the positioning described in this embodiment refers to the positioning in the circumferential direction of the first shell 400.

[0032] Optionally, both the first positioning structure and the second positioning structure here can be identification structures, such as identification lines, identification patterns, etc.; or, one of the first positioning structure and the second positioning structure can also be a positioning groove, and the other can also be a positioning convex portion, and the positioning groove and the positioning convex portion are used to realize the positioning of the expansion tube 100 and the first shell 400. It should be noted that when the first positioning structure and the second positioning structure are the positioning groove and the positioning convex portion respectively, the anti-rotation portion described above can also include the first positioning structure.

[0033] In an alternative embodiment, see Figure 4 , 5 The outer circumferential surface of the expansion tube 100 is provided with a groove 130 extending along the axial direction of the expansion tube 100. The groove 130 can cooperate with the sheath tube 600 of the guide sheath to form a second working channel. The anti-rotation portion includes the groove 130. The expansion tube 100 can cooperate with the first shell 400 in the circumferential upper limit of the expansion tube 100 through the groove edge at the opening of the groove 130. In this embodiment, the groove 130 is provided on the outer circumferential surface of the expansion tube 100. The groove 130 can form a second working channel with the sheath tube 600, so that the number of working channels can be increased without increasing the size of the expansion tube 100, thereby increasing the function of the guide sheath; and this embodiment also uses the groove 130 to stop the expansion tube 100, so that the purpose of one object with multiple uses can be achieved, and the structure of the expansion tube 100 can be simplified.

[0034] like Figures 2 to 8As shown, the embodiment of the present application also discloses a guiding structure of a guiding sheath, comprising at least one connecting tube 200 and the expansion tube 100 described in any of the above embodiments, wherein the expansion tube 100 has at least one first working channel 101, and the first working channel 101 comprises a first hole section 112 and a second hole section 121 which are connected, wherein the first hole section 112 is arranged in the first tube section 110, and the second hole section 121 is arranged in the second tube section 120, and the distal end of the connecting tube 200 is connected to the proximal end of the expansion tube 100 and is connected to the first hole section 112. Optionally, the distal end of the connecting tube 200 can be inserted into the first hole section 112, or the connecting tube 200 can also not be inserted into the first hole section 112, in which case the distal end face of the connecting tube 200 can be abutted and connected with the proximal end face of the first tube section 110. The use of the guiding structure described in this embodiment can solve the problem that the expansion tube 100 is easily separated from the connecting tube 200 in the related art.

[0035] In order to facilitate the docking connection between the connecting tube 200 and the expansion tube 100, in an optional embodiment, refer to Figure 2-3 and Figure 6-7 The guide structure further includes a fixing member 300, the fixing member 300 and the expansion tube 100 are sequentially arranged in the first direction, at least one through hole 310 is arranged in the fixing member 300, and the through hole 310 is arranged corresponding to the first working channel 101, and the distal end of the connecting tube 200 passes through the through hole 310 and is connected to the proximal end of the expansion tube 100. Specifically, when the number of the through holes 310 and the number of the first working channels 101 are both at least two, each through hole 310 corresponds to each first working channel 101 one by one.

[0036] In this embodiment, the fixing member 300 is located on the proximal side of the expansion tube 100. When the connecting tube 200 is docked with the expansion tube 100, the distal end of the connecting tube 200 can pass through the through hole 310 of the fixing member 300 and then be docked with the proximal end of the expansion tube 100. After the connecting tube 200 passes through the fixing member 300, the fixing member 300 can constrain the connecting tube 200 to reduce the bending flexibility and bending amplitude of the connecting tube 200, thereby facilitating the docking of the distal end of the connecting tube 200 with the expansion tube 100.

[0037] And / or, in an optional embodiment, the distal end of the connecting tube 200 is inserted into the first hole section 112, and the outer diameter of the distal end of the connecting tube 200 gradually decreases in the first direction. In this embodiment, when the distal end of the connecting tube 200 needs to be inserted into the first hole section 112, the smaller outer diameter of the distal end of the connecting tube 200 facilitates the insertion of the connecting tube 200 into the first hole section 112, thereby reducing the difficulty of assembling the connecting tube 200.

[0038] In an alternative embodiment, see Figure 6 , 7The proximal end of the through hole 310 has a first opening, and the first opening extends from the proximal end surface of the fixing member 300 to the outer peripheral surface of the fixing member 300. In this embodiment, the first opening extends from the proximal end surface of the fixing member 300 to the outer peripheral surface of the fixing member 300. Compared with the first opening extending only to the proximal end surface of the fixing member 300, this embodiment can increase the cross-sectional area of ​​the first opening, so that the connecting tube 200 can be inserted into the first opening from different directions, such as from the end surface of the fixing member 300 or from the side of the fixing member 300, which can reduce the assembly difficulty of inserting the connecting tube 200 into the fixing member 300.

[0039] And / or, in order to better connect the fixing member 300 to the first pipe section 110, in an optional embodiment, refer to Figure 6 , the distal end surface of the fixing member 300 is provided with a glue-containing groove 320, a gap is provided between the first tube section 110 and the inner wall of the glue-containing groove 320, and the fixing member 300 and the inner wall of the glue-containing groove 320 are bonded by glue. In this embodiment, the distal end surface of the fixing member 300 is provided with a glue-containing groove 320, and a gap is provided between the first tube section 110 and the inner wall of the glue-containing groove 320, so that the glue can be filled into the above-mentioned gap, thereby connecting the first tube section 110 with the fixing member 300, so that the proximal end of the first tube section 110 can be connected to the inner wall of the groove 130, thereby increasing the connection area between the first tube section 110 and the fixing member 300, and further increasing the connection strength between the first tube section 110 and the fixing member 300; in addition, the side wall surface of the groove 130 can also block the glue to prevent the glue from flowing out, so that a large amount of glue can be in the above-mentioned gap to ensure the connection stability between the first tube section 110 and the fixing member 300. Of course, the glue containing groove 320 may not be provided on the distal end face of the fixing member 300 . In this case, the distal end face of the fixing member 300 may be directly separated from the first tube section 110 , or the distal end face of the fixing member 300 may be fitted with the first tube section 110 .

[0040] In an optional embodiment, the fixing member 300 has a third positioning structure, and the third positioning structure can cooperate with the fourth positioning structure of the first shell 400 to position the fixing member 300 and the first shell 400 in the circumferential direction of the first shell 400. When the fixing member 300 of this embodiment is specifically assembled on the first shell 400, the third positioning structure and the fourth positioning structure can be used to position the fixing member 300 and the first shell 400, so that the fixing member 300 is located in the correct position in the first shell 400, thereby improving the docking accuracy between the fixing member 300 and the first shell 400, thereby improving the docking accuracy between the connecting tube 200 and the fixing member 300, and the docking accuracy between the connecting tube 200 and the expansion tube 100, so as to achieve accurate docking between the connecting tube 200 and the expansion tube 100.

[0041] Optionally, the third positioning structure and the fourth positioning structure here can both be identification structures, such as identification lines, identification patterns, etc.; or, one of the third positioning structure and the fourth positioning structure can also be a positioning groove, and the other can also be a positioning protrusion, and the positioning of the fixing member 300 and the first shell 400 is achieved through the positioning groove and the positioning protrusion.

[0042] like Figures 1 to 8 As shown, the embodiment of the present application also discloses a guide sheath, including a first shell 400 and the guide structure described in any of the above embodiments, the proximal end of the first tube section 110 extends into the first shell 400 and is fixedly connected to the distal end of the first shell 400. Optionally, the guide sheath also includes a second shell 500 and a sheath tube 600, the proximal end of the sheath tube 600 is fixedly connected to the distal end of the second shell 500, the second shell 500 is detachably connected to the first shell 400, and when the first shell 400 is connected to the second shell 500, the sheath tube 600 is sleeved on the outside of a portion of the dilating tube 100. After the guide sheath enters the ureter, the first shell 400 and the second shell 500 can be disassembled, and then the first shell 400 can be pulled to drive the dilating tube 100 to withdraw from the ureter, so as to achieve the purpose of retaining only the sheath tube 600 in the ureter.

[0043] In an optional embodiment, please refer to 2, 3, and 8, the first shell 400 includes a shell body 410 and a docking piece 420 that are separately arranged, the docking piece 420 is arranged at the distal end of the shell body 410, and at least a portion of the docking piece 420 is located in the shell body 410, a limiting hole 421 is provided in the docking piece 420, a portion of the expansion tube 100 is located in the limiting hole 421, and the limiting portion 111 cooperates with the limiting hole 421 in limiting position in the first direction. Specifically, the docking piece 420 can be bonded to the shell body 410, or can be fixed to the shell body 410 by screw connection, rivet connection, etc. In this embodiment, the first shell 400 includes a shell body 410 and a docking piece 420 that are separately arranged, so the expansion tube 100 can be assembled to the docking piece 420 first and then the docking piece 420 can be fixedly connected to the shell body 410, so that it is convenient to assemble the expansion tube 100 to the first shell 400. Of course, the first shell 400 may also be an integrally formed part, and the present application does not limit the specific structure of the first shell 400.

[0044] Optionally, the limiting portion 111 can be limited and cooperated with the edge of the limiting hole 421; or it can be limited and cooperated with the inner wall surface of the limiting hole 421. In this case, a step surface can be set on the inner wall of the limiting hole 421 so that the limiting portion 111 can be limited and cooperated with the step surface, or the aperture of the limiting hole 421 can be gradually reduced in the first direction. At this time, the inner wall surface of the limiting hole 421 is the inclined wedge surface described above.

[0045] The above embodiments of the present application focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here. The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present application, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present application and the claims, all of which are within the protection of the present application.

Claims

1. A dilatation tube of a guide sheath, characterized in that: The invention comprises a first tube segment (110) and a second tube segment (120) which are connected to each other. The distal end of the first tube segment (110) is connected to the proximal end of the second tube segment (120). The proximal end of the first tube segment (110) is used to be connected to a connecting tube (200) of a guide sheath. The first tube segment (110) has a limiting portion (111) which radially exceeds the second tube segment (120). The limiting portion (111) is used to cooperate with a first shell (400) of the guide sheath to limit the position in a first direction. Wherein, the first direction is a direction extending from the first pipe section (110) to the second pipe section (120).

2. The expansion tube according to claim 1, characterized in that The limiting portion (111) is annular and extends along the circumferential direction of the first pipe segment (110), and the limiting portion (111) extends along the axial direction of the first pipe segment (110) to the proximal end surface of the first pipe segment (110). The expansion tube (100) has at least one first working channel (101) therein, the first working channel (101) comprises a first hole section (112) and a second hole section (121) which are connected to each other, the first hole section (112) being arranged on the first tube section (110), the second hole section (121) being arranged on the second tube section (120), the cross-sectional area of ​​the proximal end of the first hole section (112) of at least one of the first working channels (101) being larger than the cross-sectional area of ​​the corresponding second hole section (121); or, in the first direction, the length of the limiting portion (111) radially exceeding the second tube section (120) gradually decreases.

3. The expansion tube according to claim 1, characterized in that The expansion tube (100) has a rotation stop portion, which can cooperate with the first shell (400) at the circumferential upper limit position of the expansion tube (100); and / or, the expansion tube (100) has a first positioning structure, which can cooperate with the second positioning structure of the first shell (400) to position the expansion tube (100) and the first shell (400).

4. The expansion tube according to claim 3, characterized in that The outer peripheral surface of the expansion tube (100) is provided with a groove (130) extending along the axial direction of the expansion tube (100), and the groove (130) can cooperate with the sheath tube (600) of the guide sheath to form a second working channel. The stop portion includes the groove (130), and the expansion tube (100) can cooperate with the first shell (400) at the circumferential upper limit of the expansion tube (100) through the groove edge at the opening of the groove (130).

5. A guiding structure of a guiding sheath, characterized in that: The invention comprises at least one connecting tube (200) and an expansion tube (100) as claimed in any one of claims 1 to 4, wherein the expansion tube (100) has at least one first working channel (101), wherein the first working channel (101) comprises a first hole section (112) and a second hole section (121) which are connected to each other, wherein the first hole section (112) is arranged on the first tube section (110), and the second hole section (121) is arranged on the second tube section (120), and the distal end of the connecting tube (200) is connected to the proximal end of the expansion tube (100) and is connected to the first hole section (112).

6. The guiding structure according to claim 5, characterized in that: The guiding structure further comprises a fixing member (300), wherein the fixing member (300) and the expansion tube (100) are arranged in sequence in the first direction, wherein at least one through hole (310) is provided in the fixing member (300), wherein the through hole (310) is arranged corresponding to the first working channel (101), wherein the distal end of the connecting tube (200) passes through the through hole (310) and is butt-connected with the proximal end of the expansion tube (100); and / or wherein the distal end of the connecting tube (200) is inserted into the first hole section (112), and the outer diameter of the distal end of the connecting tube (200) gradually decreases in the first direction.

7. The guiding structure according to claim 6, characterized in that: The proximal end of the through hole (310) has a first opening, and the first opening extends from the proximal end surface of the fixing member (300) to the outer peripheral surface of the fixing member (300); and / or, A glue-containing groove (320) is provided on the distal end surface of the fixing member (300), a gap is provided between the first tube section (110) and the inner wall of the glue-containing groove (320), and the fixing member (300) and the inner wall of the glue-containing groove (320) are bonded together by glue.

8. The guiding structure according to claim 6, characterized in that: The fixing member (300) has a third positioning structure, and the third positioning structure can cooperate with the fourth positioning structure of the first shell (400) to position the fixing member (300) and the first shell (400) in the circumferential direction of the first shell (400).

9. A guide sheath, characterized in that: It comprises a first shell (400) and a guiding structure as claimed in any one of claims 5 to 8, wherein the proximal end of the first tube section (110) extends into the first shell (400) and is fixedly connected to the distal end of the first shell (400).

10. The introducer sheath according to claim 9, characterized in that: The first shell (400) includes a shell body (410) and a docking piece (420) which are separately arranged. The docking piece (420) is arranged at the distal end of the shell body (410), and at least a portion of the docking piece (420) is located in the shell body (410). A limiting hole (421) is provided in the docking piece (420), a portion of the expansion tube (100) is located in the limiting hole (421), and the limiting portion (111) cooperates with the limiting hole (421) to limit the position in the first direction.

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