A delivery sheath

Abstract

The present application relates to a kind of delivery sheath, comprising: shell assembly, it extends along longitudinal axis;Sheath tube, proximal end extends into the shell assembly;Exhaust device is arranged in the inner cavity distal side of the shell assembly, the exhaust device includes tee joint, the tee joint includes branch pipe and main pipe that are communicated with each other, the branch pipe is communicated with tee valve assembly after being radially penetrated out of the shell assembly, the proximal end outlet of the main pipe is connected with the proximal end closure that can be closed, the distal end of the main pipe is detachably connected with sheath tube connector, the distal end outlet of the tee joint is communicated with the sheath tube by the sheath tube connector.The exhaust device of the delivery sheath has excellent sealing performance, and has good exhaust effect.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and in particular to a delivery sheath. Background Technology

[0002] The primary condition for interventional therapy is accurate localization of the diseased blood vessel. Besides the clinician's skillful operation and patience, the sheath plays a crucial role in interventional procedures. An adjustable sheath is a medical device that allows for sheath bending, integrating the functions of target vessel overselection and adjustable device release angle. It can establish and provide access for the release and retrieval of implanted devices. Adjustable sheaths enable clinicians to overselect appropriate sheath angles to tackle complex surgical cases.

[0003] Currently available delivery sheaths include unidirectional and bidirectional adjustable bending sheaths, allowing for unidirectional or bidirectional bending of the sheath tube. However, existing adjustable bending sheaths lack a feedback mechanism, making it impossible for the operator to determine the adjustment progress during operation. This leads to deviations between the bending angle of the sheath tube and the actual requirements during bending, placing high demands on the operator and resulting in longer operation times. Furthermore, the three-way valve assembly of existing delivery sheaths is located on the proximal side, which can hinder the operator's operation. In addition, the poor sealing effect of existing venting devices results in ineffective venting. Summary of the Invention

[0004] Therefore, it is necessary to address the problem of poor sealing performance of the delivery sheath venting device by providing a delivery sheath, comprising: a housing assembly extending along a longitudinal axis; a sheath tube with its proximal end extending into the housing assembly; and a venting device disposed on the distal side of the inner cavity of the housing assembly, the venting device including a tee connector, the tee connector including a branch pipe and a main pipe communicating with each other, the branch pipe extending radially out of the housing assembly, the proximal outlet of the main pipe being connected to a proximal closure member that can close it, and the distal end of the main pipe being detachably connected to a sheath tube connector that can connect the distal outlet of the tee connector to the sheath tube.

[0005] Furthermore, the sheath connector includes a sheath connector head detachably connected to the distal end of the main tube, the inner wall of the proximal side of the sheath abutting against the distal end face of the main tube, and the outer wall of the distal side of the sheath abutting against the inner wall of the sheath connector head.

[0006] Furthermore, the sheath connector also includes an adjusting sleeve, which is received and confined within the inner cavity of the main tube, and the inner wall of the proximal side of the sheath abuts against the distal end face of the adjusting sleeve.

[0007] Furthermore, the sheath connector includes a first connecting hole on the proximal side, a second connecting hole on the distal side, and a stepped surface connecting the first connecting hole and the second connecting hole, the stepped surface abutting against the outer wall of the sheath.

[0008] Furthermore, the stepped surface is a conical surface, and the distal end of the main tube is provided with a tee connector conical surface. The taper of the tee connector conical surface is equal to or substantially equal to the taper of the stepped surface. The inner wall of the proximal side of the sheath is pressed against the tee connector conical surface, and the outer wall of the distal side of the sheath is pressed against the conical surface.

[0009] Furthermore, the distal end face of the adjusting sleeve is a conical surface of the adjusting sleeve, and the taper of the conical surface of the adjusting sleeve is equal to or substantially equal to the conical surface of the tee connector. The conical surface of the adjusting sleeve can be flush with the conical surface of the tee connector and simultaneously abut against the inner wall of the sheath.

[0010] Furthermore, the inner diameter of the adjusting sleeve is less than or equal to the inner diameter of the sheath.

[0011] Furthermore, it also includes a hollow guide rail component with an inner cavity, the guide rail component including a guide rail component body, the tee connector being fixedly connected to the distal end of the guide rail component body, and the proximal outlet of the guide rail component constituting the proximal outlet of the main tube.

[0012] Furthermore, the guide rail component has a through hole on its side wall that communicates with its inner cavity, and a waterproof and breathable component is provided on the through hole to seal it.

[0013] Furthermore, the waterproof and breathable component is made of at least one of PTFE, dialysis paper, or breathable steel.

[0014] Furthermore, the proximal closure includes a sealing gasket and an end cap that can press the sealing gasket tightly. The sealing gasket is sealed to the proximal end face of the main tube or guide rail, and the end cap is connected to the outer peripheral surface of the proximal side of the main tube or guide rail to press the sealing gasket tightly.

[0015] The technical solution of the present invention has the following beneficial effects:

[0016] 1. The adjustable bending sheath of the present invention, through the limiting member and the limiting groove, provides feedback to the operator to determine the position of the slider, and then determines the progress of bending the tube based on the position. This feedback mechanism allows the operator to gradually and progressively bend the tube, improving the operator's bending accuracy, reducing the demands on the operator, and increasing the success rate of the procedure. Furthermore, when the limiting member is positioned in the limiting groove, the slider can be positioned at a certain position on the guide rail, thereby maintaining a specific bending angle of the tube. That is, the limiting member and the limiting groove can also constitute a locking element for the slider, limiting it to a specific position in the axial direction.

[0017] 2. This invention prevents the tube from shifting or deforming when the wire is pulled by setting a limiting sleeve, which can avoid the wire from being misaligned to a certain extent and protect the sheath from damage, thereby improving the success rate of bending.

[0018] 3. This invention provides an overflow hole and a thread hole on the pressure block, using glue to fix the pressure block and the slider. The wire is fixed to the lower end of the pressure block and bent into the overflow hole and the thread hole, which increases the length of the fixed part between the wire and the pressure block and enhances the degree of fixation between the wire and the pressure block. It also avoids the phenomenon of misalignment at the connection between the wire and the slider when the wire is pulled.

[0019] 4. By setting an adjustment sleeve, the present invention allows for the selection of an adjustment sleeve of the corresponding specification according to the sheath tube with different inner diameters. This increases the contact area between the adjustment sleeve and the proximal end of the sheath tube, improves the connection stability, enhances the sealing effect, and enables the delivery sheath to be fitted with sheath tubes of different inner diameters, thus improving its adaptability.

[0020] 5. This invention places the operating knob at the tail end of the handle assembly, allowing the operator to adjust the bend with one hand. When used in conjunction with other medical devices, such as delivery sheaths or guidewires, the operator can adjust the sheath with one hand while inserting other medical devices with the other, eliminating the need to switch hands. Furthermore, the exhaust pipe's distal location does not interfere with surgical procedures, improving operational efficiency and reducing errors. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the adjustable curved sheath in the first embodiment;

[0022] Figure 2 This is an exploded structural diagram of the adjustable bending sheath in the first embodiment;

[0023] Figure 3 This is a cross-sectional view of the adjustable bending sheath in the first embodiment;

[0024] Figures 4A-4B This is a schematic diagram of the shell assembly structure in the first embodiment;

[0025] Figure 5 This is a schematic diagram of the operation knob structure in the first embodiment;

[0026] Figures 6A-6B This is a schematic diagram of the transmission sleeve in the first embodiment.

[0027] Figures 7A-7C This is a schematic diagram of the guide rail component in the first embodiment;

[0028] Figure 8A This is a schematic diagram of the structure of the first slider in the first embodiment;

[0029] Figure 8B This is a schematic diagram of the structure of the second slider in the first embodiment;

[0030] Figure 9 This is a schematic diagram of the pressure block in the first embodiment;

[0031] Figure 10 This is a schematic diagram of the thread routing in the first embodiment;

[0032] Figure 11 This is a schematic diagram of the limiting sleeve in the first embodiment;

[0033] Figure 12 This is a schematic diagram of the thread routing in the second embodiment;

[0034] Figure 13 This is another schematic diagram of the thread routing in the second embodiment;

[0035] Figure 14 This is an exploded structural diagram of the exhaust device in the third embodiment;

[0036] Figure 15-16 This is a cross-sectional view of the delivery sheath in the third embodiment;

[0037] Figure 17 This is a schematic diagram of the tee connector structure in the third embodiment;

[0038] Figure 18 This is a schematic diagram of the adjusting sleeve in the third embodiment;

[0039] Figure 19 This is a cross-sectional view of the sheath connector;

[0040] Figure 20-21 Assembly diagrams for sheaths and adjusting sleeves with different inner diameters;

[0041] Figure 22 This is an exploded view of the exhaust device in the fourth embodiment;

[0042] Figure 23-24This is a cross-sectional view of the delivery sheath in the fourth embodiment;

[0043] Figure 25 This is a 3D structural diagram of the guide rail component;

[0044] Figure 26 This is a sectional view of the guide rail component; Detailed Implementation

[0045] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0046] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0048] It should be noted that, for a delivery system, the end of the delivery system that is relatively closer to the operator is generally called the "proximal end," and the end of the delivery system that is relatively farther from the operator is called the "distal end." Based on this principle, the "proximal end" and "distal end" of any component of the delivery system are defined. "Axial" refers to the direction parallel to the line connecting the center of the distal end and the center of the proximal end of the medical device. "Radial" refers to the direction perpendicular to the axial direction.

[0049] First Embodiment

[0050] See Figure 1 As shown, this embodiment provides an adjustable curved sheath 1, including a handle assembly 100 and a tube 200. The proximal end of the tube 200 is connected to the handle assembly 100, and the tube 200 can be a sheath or a catheter. Specifically, see [link to documentation]. Figure 2-3As shown, the bending sheath 1 includes a housing assembly 90 extending along the longitudinal axis; the proximal end of the tube 200 is connected to the housing assembly 90; a guide rail 30 is fixedly disposed within the housing assembly 90; a first slider 51 is slidably disposed on a first side of the guide rail 30; a second slider 52 is slidably disposed on a second side of the guide rail 30; and a wire 400, including a first wire 400B and a second wire 400A. One end of the first wire 400B is connected to the first slider 51, and the other end is connected to the first position of the pipe 200 in the circumferential direction; one end of the second wire 400A is connected to the second slider 52, and the other end is connected to the second position of the pipe 200 in the circumferential direction; the transmission sleeve 40 has an internal thread, and both the first slider 51 and the second slider 52 are disposed inside the transmission sleeve 40, and the external threads on the two sliders are engaged with the internal threads on the transmission sleeve. By rotating the operating knob 60, the transmission sleeve 40 is rotated, and the first slider 51 and the second slider 52 move in opposite directions along the longitudinal axis, thereby causing the pipe 200 to deflect in the first direction or the second direction through the first wire 400B or the second wire 400A.

[0051] In this embodiment, the adjustable bending sheath 1 is bidirectionally adjustable, having two sliders and two threads. By operating the adjustable bending sheath, the pipe 200 can be bent in two different directions circumferentially. In other embodiments, it may only include one slider and one thread, enabling adjustable bending of the pipe in only one direction.

[0052] See Figure 2-3As shown, the handle assembly 100 includes a housing assembly 90, an operating knob 60, an exhaust device 80, and a protective sleeve 10. The operating knob 60 is rotatably disposed at the proximal end of the housing assembly 90, and its distal end face abuts against the proximal end face of the housing assembly 90. In other embodiments, the distal end face of the operating knob 60 does not abut against the proximal end face of the housing assembly 90, but has a certain gap, within which a limiting or locking element for the operating knob 60 can be disposed. The protective sleeve 10 is disposed at the distal end of the housing assembly 90 and is flared in shape. The material of the protective sleeve 10 is selected from elastic materials such as silicone or rubber. The proximal end of the tube 200 passes through the distal end of the protective sleeve 10 and enters the cavity of the housing assembly 90. The protective sleeve 10 is used to prevent the portion of the tube 200 in contact with it from bending at an excessive angle and breaking. The venting device 80 is located near the operating knob 60 and includes an end cap 81, a sealing gasket 82, a tee connector 83, a threaded connector 84, and an adjusting sleeve 85. The adjusting sleeve 85 is located inside the threaded connector 84, the distal end of which engages with the internal thread of the guide rail 30, and the proximal end engages with the external thread of the tee connector 83. A sealing gasket 82 is located near the tee connector 83 to seal the proximal inlet of the venting device 80. The end cap 81 is threaded onto the proximal side of the tee connector 83 to secure the sealing gasket 82. A tee valve assembly (not shown) is connected to the vertical branch side of the tee connector 83. This tee valve assembly includes a tee valve and a hose; one end of the hose is connected to the vertical branch, and the other end is connected to the tee valve. In actual use, liquid can be injected into the tee valve and enter the pipe fitting 200 through the venting device 80 to vent the pipe fitting 200.

[0053] See Figures 4A-4BAs shown, the housing assembly 90 is generally cylindrical in shape, extending along its longitudinal axis. For ease of operation, in other embodiments, the middle portion of the outer wall of the housing assembly 90 is recessed inwards, and the outer diameter of the middle portion of the outer wall is smaller than the outer diameters of its two ends, facilitating gripping by the operator. The interior of the housing assembly 90 has multiple axially protruding structures, specifically including a first arc-shaped protrusion 901, a second arc-shaped protrusion 902, a third arc-shaped protrusion 903, a block-shaped protrusion 904, a fourth arc-shaped protrusion 905, and a fifth arc-shaped protrusion 906 arranged sequentially from the distal end to the proximal end. Each arc-shaped protrusion is concentrically arranged relative to the housing assembly 90. The first arc-shaped protrusion 901 is located at the distal end of the housing assembly 90, and the fifth arc-shaped protrusion 906 is located at the proximal end of the housing assembly 90. The fourth arc-shaped protrusion 905 is located near the fifth arc-shaped protrusion 906. A block protrusion 904 is provided at the distal end of the fourth arc-shaped protrusion 905, and a third arc-shaped protrusion 903 and a second arc-shaped protrusion 902 are sequentially provided at the distal end of the block protrusion 904. The third arc-shaped protrusion 903 includes an arc-shaped unit 9031 and stops 9032 at both ends of the arc-shaped unit 9031. The fourth arc-shaped protrusion 905 is used to limit the pipe fitting 200, ensuring that the pipe fitting 200 is located at the center of the housing assembly 90; the second arc-shaped protrusion 902 engages with the outer wall of the transmission sleeve 40 to provide support for the rotation of the transmission sleeve 40; and the fifth arc-shaped protrusion 906 is used for the installation of the protective sleeve 10 on the housing assembly 90.

[0054] In this embodiment, for ease of processing and assembly, the housing assembly 90 can be designed to be split in half, i.e., the housing assembly 90 includes a first housing 91 and a second housing 92. Multiple connecting structures are provided at the connection point between the first housing 91 and the second housing 92. These connecting structures can be snap-fit ​​structures and / or protrusion-groove structures. The first housing 91 and the second housing 92 are connected to each other via the connecting structures and, after snapping together, form a cylindrical housing assembly 90. In this embodiment, a snap-fit ​​protrusion 911 is provided on the first housing 91, and a snap-fit ​​groove 921 is provided on the second housing 92. The assembly and fixation of the two housings are achieved through their snap-fit ​​connection.

[0055] See Figure 5 The operating knob 60 has a ring-shaped structure. The diameter of the distal opening of this ring structure can be the same as or different from the diameter of the inlet opening, depending on the shape of the handle. The outer wall of the operating knob 60 is provided with anti-slip components 601, such as striped structures, threaded structures, or protrusion structures. The inner wall of the operating knob 60 is provided with a slot structure 602. There can be one or multiple slot structures 602 evenly distributed circumferentially on the inner wall of the operating knob 60.

[0056] See also Figure 3As shown, the handle assembly 100 includes a transmission component 300, which includes a transmission sleeve 40, a guide rail 30, and a slider assembly 50. The transmission sleeve 40 is fitted onto both the guide rail 30 and the slider assembly 50. By rotating the transmission sleeve 40, the slider assembly 50 can be moved on the guide rail 30.

[0057] See Figures 6A-6B The structure of the transmission sleeve 40 is described below. The transmission sleeve 40 is cylindrical, and its inner wall is provided with an internal thread structure, which includes a first internal thread 401 and a second internal thread 402 that are arranged in a cross configuration. The first internal thread 401 and the second internal thread 402 have opposite directions of rotation. When the first internal thread 401 is a left-hand thread, the second internal thread 402 is a right-hand thread, or when the first internal thread 401 is a right-hand thread, the second internal thread 402 is a left-hand helical thread. The specific rotation directions of the first internal thread 401 and the second internal thread 402 are not limited, as long as their rotation directions are opposite and they are arranged in a cross configuration on the inner wall of the transmission sleeve 40.

[0058] A protruding structure 404 is provided on the outer wall of the transmission sleeve 40. This protruding structure 404 cooperates with the slot structure 602 on the inner wall of the operating knob 60 to achieve a fixed connection between the transmission sleeve 40 and the operating knob 60. It can be understood that, in one embodiment, a slot structure can be provided on the outer wall near the proximal end of the transmission sleeve 40, and a corresponding protruding structure can be provided on the inner wall of the operating knob 60, with the slot structure and the protruding structure cooperating with each other. In this embodiment, the protruding structure 404 on the outer wall of the transmission sleeve 40 is located near the proximal end of the transmission sleeve 40. In other embodiments, the protruding structure 404 can also be located in the middle or distal end of the transmission sleeve 40. The position of the protruding structure 404 is mainly determined according to the position of the operating knob 60. In this embodiment, an annular groove 403 is also provided on the outer wall of the transmission sleeve 40. The annular groove 403 cooperates with the fifth arc-shaped protrusion 906 of the housing assembly 90, so that the transmission sleeve 40 can rotate relative to the housing assembly 90 but cannot move axially.

[0059] In this embodiment, for ease of processing and assembly, the transmission sleeve 40 is designed to be split in half, including an upper transmission sleeve 41 and a lower transmission sleeve 42. The upper transmission sleeve 41 has multiple sleeve protrusions 411 along its axial direction on its side wall, and the lower transmission sleeve 42 has multiple sleeve grooves 421 along its axial direction on its side wall, which cooperate with the sleeve protrusions 411, thereby enabling the assembly of the upper transmission sleeve 41 and the lower transmission sleeve 42. In other embodiments, the transmission sleeve may be integrally formed.

[0060] See Figures 7A-7BThe structure of the guide rail component 30 is described below. The guide rail component 30 includes a slot structure 301 at its distal end and an internal thread 306 at its proximal end. The slot structures 301 are positioned opposite each other on the outer wall of the distal end of the guide rail component 30, and are formed by recesses on the outer surface of the guide rail component 30. When the guide rail component 30 is installed in the housing assembly 90, the slot structures 301 on both sides engage with the stops 9032 of the housing assembly 90, i.e., the stops 9032 on both sides are engaged in the slot structures 301 on both sides. At this time, the arc-shaped unit 9031 of the third arc-shaped protrusion 903 engages with the outer peripheral surface of the guide rail component 30. Due to the limiting effect of the stops 9032 on the slot structures 301, the two cannot rotate or move relative to each other, thereby achieving a fixed assembly of the guide rail component 30 and the housing assembly 90. In other embodiments, only one slot structure and one stop that engages with the slot structure may be provided.

[0061] A first recessed structure 303 is provided axially between the slot structure 301 and the internal thread 306 of the guide rail component. This first recessed structure 303 includes a bottom surface 3031 and end face surfaces 3032 at both ends of the bottom surface 3031. In this embodiment, the first recessed structure 303 is formed by removing material of a certain depth and axial length along the radial direction of the guide rail component 30. A wire hole 302 is provided on the distal end face surface 3034, which passes through the guide rail component 30 along the distal side. First slide rail grooves 304 are provided axially on both sides of the bottom surface 3031. The two first slide rail grooves 304 can be symmetrically arranged relative to the longitudinal direction of the guide rail component 301, or they can be asymmetrically arranged. The length of the first slide rail groove 304 is the same as the length of the first recessed structure, and this length depends on the range of bending angles on the tube body 200. When the lengths of the first slide rail groove 304 and the first recessed structure 303 are the same, the end face 3034 forms the two ends of the first slide rail groove 304. In other embodiments, the length of the first slide rail groove 304 is less than the length of the first recessed structure 303. The first slide rail groove 304 includes a first side face 3041 and a second side face 3042, wherein the first side face 3041 is further away from the central axis than the second side face 3042. A first limiting groove 305 is provided on the first side face 3041 of one of the two first slide rail grooves 304. In this embodiment, a plurality of first limiting grooves 305 are sequentially spaced along the axial direction. The plurality of first limiting grooves 305 can be equidistant or unequally spaced. The first limiting groove 305 can be an arc-shaped groove structure or a zigzag groove structure.

[0062] See Figure 7BAs shown, a second recessed structure 307 is also provided on the side of the guide rail 306 opposite to the first recessed structure 303. Since the second recessed structure 307 is essentially the same as the first recessed structure 303, its specific structure will not be described in detail here. In this embodiment, the second recessed structure 307 and the first recessed structure 303 are symmetrically arranged with respect to the longitudinal direction of the guide rail. In other embodiments, they may be asymmetrically arranged. Two second slide rail grooves 308, which are essentially the same as the structure of the first slide rail groove 304, are also provided on the second recessed structure 307. A second limiting groove 309 is provided on the first side of one of the two second slide rail grooves 308. In this embodiment, the second limiting grooves 309 are arranged sequentially at intervals along the axial direction; the multiple second limiting grooves 309 can be equidistant or unequally spaced. The number of second limiting grooves 309 is the same as the number of first limiting grooves 305, and at least some of the second limiting grooves 309 are aligned with the first limiting grooves 305 in the radial direction. In other embodiments, the number of second limiting grooves 309 is different from the number of first limiting grooves 305, and / or each second limiting groove 309 is not aligned with each first limiting groove 305.

[0063] In other embodiments, there may be only one first slide rail groove and / or second slide rail groove, disposed on one side of the bottom surface. In other embodiments, limiting grooves may also be provided on both the first and second sides of the first slide rail groove and / or the second slide rail groove, and the limiting grooves are not limited to being disposed on the first side, but may also be disposed on the second side or simultaneously on both the first and second sides.

[0064] See Figure 7C As shown, the guide rail component 30 has a tubular structure with an inner hole 311. The distal end of the thread 306 communicates with the inner hole 311 through a tapered hole 310. See also Figure 2-3 As shown, the threaded connector 84 is connected to the guide rail component thread 306.

[0065] See Figures 8A-8B The structure of the slider assembly is described below. The slider assembly 50 includes a first slider 51 and a second slider 52. See also... Figure 8A As shown, the first slider 51 is roughly cubic in shape. The first arc-shaped surface 510 of the first slider 51 is provided with a first external thread structure 511. The first arc-shaped surface 510 is disposed opposite to the inner wall of the transmission sleeve 40. The first external thread structure 511 of the first arc-shaped surface 510 of the first slider 51 cooperates with the first internal thread 401 disposed inside the transmission sleeve 40.

[0066] The side of the first slider 51 opposite to the first arc-shaped surface 510 engages with the first slide rail groove 304. The first slider 51 is provided with sliding members; in this embodiment, the sliding members are protruding sliding members 514. Two protruding sliding members 514 are provided on the surface of the first slider 51 opposite to the first arc-shaped surface 510. These two protruding sliding members 514 engage with the first slide rail grooves 304 on both sides, allowing the first slider 51 to slide axially on the first recessed structure 303. A first limiting member 515 is provided on the outer side of the protruding sliding member 514. In this embodiment, the first limiting member 515 includes a support arm 5152, one end of which is fixedly connected to or integrally formed with the first slider 51, and the other end is provided with a locking head protrusion 5151. The locking head protrusion 5151 is a block-shaped protrusion with chamfered or rounded corners on both sides to facilitate entry into or exit from the first limiting groove. When subjected to external force, the support wall 5152 rotates relative to the first slider 51 and / or the support wall 5152 itself undergoes elastic deformation, thereby enabling the first limiting member 515 to provide an elastic restoring force as a whole.

[0067] When the first slider 51 slides axially along the first recessed structure 303, the two protruding sliders 514 are respectively embedded in the two first slide rail grooves 304, wherein the first limiting member 515 cooperates with the first limiting groove 305. Specifically, when the first slider 51 slides, the first limiting member 515 will bounce regularly according to the position of the first limiting groove 305, and the chuck protrusion 5151 will enter each first limiting groove 305 in sequence. This provides feedback to the operator, letting the operator know the relative position of the first slider 51 in the first slide rail groove 304. Based on this relative position, the bending progress of the pipe can be determined, improving the operator's bending operation accuracy, reducing the requirements on the operator, and increasing the success rate of the operation.

[0068] In addition, the first slider 51 is also provided with a receiving groove 512 and a first through hole 513. The first through hole 513 extends axially, passes through the first slider 51 and communicates with the receiving groove 512. A fixing member is provided in the receiving groove 512. The fixing member can be a screw or a fixing member of other materials, as long as it can be fixed in the receiving groove 512.

[0069] The structure of the second slider 52 is similar to that of the first slider 51. The difference is that the second arc-shaped surface 520 of the second slider 52 has a second external thread structure 521 with a rotation direction opposite to that of the first external thread structure 511. The second arc-shaped surface 520 is disposed opposite to the inner wall of the transmission sleeve 40, and the second external thread structure 521 of the second arc-shaped surface 520 of the second slider 52 cooperates with the second internal thread 402 disposed inside the transmission sleeve 40. As for the other structures of the second slider 52, since they are the same as those of the first slider 51, they will not be described in detail here. It should be emphasized that a second limiting member 522 with the same structure as the first limiting member 515 is also provided on one side of the second slider 52. The second limiting member 522 cooperates with the second limiting groove 309. In this application, the first limiting member 515 and the second limiting member 522 are collectively referred to as limiting members, and the first limiting groove 305 and the second limiting groove 309 are collectively referred to as limiting grooves. The limiting member includes a first limiting member 515 and / or a second limiting member 522, and the limiting groove includes a first limiting groove 305 and / or a second limiting groove 309.

[0070] In other embodiments, for each of the first and / or second sliders, only one protruding slider may be provided, and the number of protruding sliders matches the number of the first and second limiting grooves. In other embodiments, the first and / or second limiting members may also be provided on the inner side of the protruding slider, or simultaneously on the inner and outer sides of the protruding slider. The position and number of the first and / or second limiting grooves match the position of the first and / or second limiting grooves on the first and / or second slide rail grooves, so that each first and / or second limiting member matches the corresponding first and / or second limiting groove. For example, when first limiting members are provided on both the inner and outer sides of the protruding slider, the first limiting grooves are provided on both sides of the first slide rail groove.

[0071] In other embodiments, the first limiting member and the second limiting member include a telescopic rod, one end of which is a free end that cooperates with the limiting groove, and the other end is elastically connected to the first slider.

[0072] See Figure 9 In this embodiment, the fixing member provided in the receiving groove 51 is a cylindrical pressure block 70, which has an overflow hole 701 extending along the axis. In addition, the pressure block 70 may also have a slot 703 to facilitate rotation of the pressure block 70.

[0073] See Figure 10As shown, the proximal end of the wire 400 enters the receiving groove 512 after passing through the through hole 513. At this time, the wire pressing block 70 is installed in the receiving groove 512, and its lower end face presses the wire 400 tightly. In this embodiment, after the proximal end of the wire 400 enters the receiving groove 512 through the through hole 513, glue is dripped into the receiving groove 512, and then the wire pressing block 70 is installed in the receiving groove 512 to press the wire 400 tightly. Excess glue can be discharged through the overflow hole 701. The wire pressing block 70 is fixed in the receiving groove 512 by the glue to realize the connection between the wire 400 and the first slider 51. Furthermore, after the proximal end of the wire 400 enters the receiving groove 512 through the through hole 513 located on one side of the receiving groove 512, the wire 400 continues to extend to the edge of the receiving groove 512 and then bends upward to enter the through hole 513 on the other side of the receiving groove 512. This extends the connection length between the wire 400 and the first slider 51 when fixed with glue, thus enhancing the connection strength between the wire 400 and the first slider 51. In other embodiments, after the proximal end of the wire enters the receiving groove through the through hole located on one side of the receiving groove, it can bend upward to enter the overflow hole, and then bend downward to enter the through hole on the other side of the receiving groove.

[0074] See Figure 11 As shown, the limiting sleeve 20 has a hollow inner cavity 22, and a protrusion 21 on its outer side. A rectangular protrusion 23 is provided on the outer side of the limiting sleeve 20, and a limiting sleeve groove 231 communicating with the hollow inner cavity 22 is formed in the rectangular protrusion 23. See also... Figure 2As shown, when the limiting sleeve 20 is connected to the outer shell assembly 90, the protrusion 21 is engaged in the groove of the block protrusion 904 to achieve a fixed connection with the outer shell assembly 90. In this embodiment, the thread 400 enters the tube wall of the tube 200 from the outside of the tube 200 and then extends axially to the distal end of the tube 200. After the tube 200 passes through the hollow inner cavity 22, the tube with the thread 400 is located inside the limiting sleeve 400, at which time the thread 400 is at least partially located inside the limiting sleeve 400. The length of the thread located in the limiting sleeve 400 can be set to be greater than 0 and less than or equal to the axial length of the limiting sleeve. Adhesive is dripped into the hollow inner cavity 22 through the groove 231 of the limiting sleeve to fix the tube 200 inside the hollow inner cavity 22. When the first slider 51 or the second slider 52 moves along the guide rail and during the engagement of the limiting member and the limiting groove, the pulling direction of the slider on the wire changes, causing the tension of the wire 400 on the tube 200 to change, which can easily lead to movement or deformation of the tube. Since the tube 200 is fixedly connected to the limiting sleeve 400, and the limiting sleeve 400 is fixedly connected to the outer casing assembly 90, pulling the wire 400 will not cause movement of the tube 200. Furthermore, because the limiting sleeve 400 is fixed to the tube 200, its presence enhances the local strength of the tube 200, preventing deformation of the tube 200 when the wire 400 is pulled, thus affecting the bending operation of the tube 200. This can, to a certain extent, avoid wire misalignment and protect the sheath from damage, improving the bending success rate.

[0075] Second Embodiment

[0076] The support device in this embodiment is basically the same in structure as the adjustable curved sheath in the first embodiment, except that the structure of the pressure block is different. See also Figure 12 As shown, the pressure block 70a is cylindrical in shape and has an overflow hole 701a extending along its axis, as well as a threading hole 702a that penetrates the pressure block 70a radially, and the threading hole 702a communicates with the overflow hole 701a. The near end of the wire 400 enters the receiving groove 512 through a through hole 513 located on one side of the receiving groove 512, then bends downwards to the bottom of the receiving groove 512 and continues to extend to the overflow hole 701a. It then bends upwards into 701a and enters the through hole 513 on the other side of the receiving groove 512 through the threading hole 702a. In this embodiment, because the threading hole 702a is provided, the wire can pass through the threading hole 702a. When fixed with glue, the wire 400 is pressed between the lower end face of the pressure block 70a and the receiving groove 512, and is also fixed in the glue overflow hole 701a and the thread hole 702a by glue. This increases the length of the fixed part of the wire 400 and the pressure block 70a, and enhances the degree of fixation between the wire 400 and the pressure block 70a. It can also prevent the wire 400 from having any looseness at the connection between the wire 400 and the slider 70a when the wire 400 is pulled.

[0077] See Figure 13 As shown, in this embodiment, the wire 400 can also adopt different routing methods. Specifically, the near end of the wire 400 passes through the through hole 513 located on one side of the receiving groove 512 and directly enters the thread hole 702a. It bends downward at the overflow hole 701a to reach the bottom of the receiving groove 512, continues to extend to the edge of the receiving groove 512, and then bends upward to enter the through hole 513 on the other side of the receiving groove 512.

[0078] Third Embodiment

[0079] The adjustable curved sheath (conveyor sheath) in this embodiment has a structure that is basically the same as that in the first embodiment, except that the structure of the exhaust device is different.

[0080] See Figure 14 As shown, the venting device 500 in this embodiment includes a proximal seal 500a, a sheath connector 500b, and a tee connector 69. The proximal seal 500a includes an end cap 68 and a sealing gasket 67, while the sheath connector 500 includes an adjusting sleeve 63 and a sheath connector 62. The venting device 500 is connected to the sheath 200, and air in the sheath 200 is expelled by introducing venting fluid (such as saline solution) into the venting device 500.

[0081] See Figure 15-16 As shown, the delivery sheath 2 in this embodiment includes a housing assembly 61 extending along the longitudinal axis, with the proximal end of the sheath tube 200 extending into the housing assembly 61. A guide rail 64 is fixedly disposed in the housing assembly 61, and a first slider and a second slider are slidably connected to the guide rail 64. A transmission sleeve 65 is disposed inside the housing assembly 61 and fitted onto the guide rail 64 so that the first slider and the second slider engage with internal threads of opposite and intersecting directions provided on the inner wall of the transmission sleeve 65. The proximal end of the transmission sleeve 65 extends out of the housing assembly 61 and is fixedly connected to an operating knob 66. By rotating the operating knob 66, the transmission sleeve 65 is rotated, causing the first slider and the second slider to slide in opposite directions on the guide rail 64, thereby achieving adjustable bending of the sheath tube 200. In addition, similar to the first embodiment, a limiting groove is also provided on the guide rail 64 in this embodiment, and limiting members that cooperate with the limiting groove are provided on the first slider and the second slider. Considering that the basic structure of the delivery sheath in this embodiment is basically the same as that in the first embodiment, the specific related structures can be referred to the foregoing embodiments, and will not be described in detail here.

[0082] Unlike the first embodiment, in this embodiment, the venting device 500 is disposed within the inner cavity of the housing assembly 61, at the distal end opposite to the operating knob 66. Its inlet end passes radially through the housing assembly 61 and communicates with a three-way valve assembly (not shown in the figure). The proximal outlet is closed, and the distal outlet is fixed to the proximal end of the sheath 200 and communicates with it. Venting fluid is injected from the inlet end of the venting device 500. Because the proximal outlet is closed, the fluid only flows to the distal outlet and then into the sheath 200, thereby venting the air inside the sheath 200 and achieving the venting operation.

[0083] See Figure 17 The structure of the tee connector 69 is described below. The tee connector 69 includes a branch pipe 691 and a main pipe 692 that are interconnected. The end of the branch pipe 691 furthest from the main pipe (i.e., the free end of the branch pipe 691, which is also the inlet end of the exhaust device 500) can communicate with a three-way valve assembly (not shown in the figure), and the other end communicates with the main pipe 692. Both the proximal and distal ends of the main pipe 692 are provided with external threads, and the distal end face has a tee connector tapered surface 6922. Furthermore, a limiting protrusion 6921 extending along the longitudinal axis is provided on the inner wall of the main pipe 692. The length of the limiting protrusion 6921 can be equal to or unequal to the axial length of the main pipe 692, and the distal end of the limiting protrusion 6921 can be flush with or not flush with the distal end face of the tee connector 69. When the distal end of the limiting protrusion 6921 is a certain distance from the tee connector 69 and is not flush with it, the adjusting sleeve can slide more into the tee connector from the proximal end compared to when they are flush, thus making the connection between the two more secure.

[0084] See Figure 18The structure of the adjusting sleeve 63 is described below. The adjusting sleeve 63 is a cylindrical structure with an inner cavity, including a cylindrical portion and an adjusting sleeve conical surface 634 located at the distal end of the cylindrical portion. The taper of this adjusting sleeve conical surface 634 is equal to or substantially equal to the taper of the tee connector conical surface 6922 located at the distal end of the main tube 692. The taper is substantially equal because, considering the dimensional tolerances in actual manufacturing, the taper angle can differ by within ±1 degree. The length is substantially equal because, considering the dimensional tolerances in actual manufacturing, the dimensional tolerance is within ±2 millimeters. Furthermore, a sleeve through groove 632 is provided on the outer periphery of the adjusting sleeve 63, extending a certain distance along the longitudinal axis from the proximal end, penetrating the inner cavity of the adjusting sleeve 63 to the outside. In this embodiment, the proximal end of the sleeve through groove 632 is flush with the proximal end face of the adjusting sleeve 63 and extends a certain distance, which is less than the length of the cylindrical portion of the adjusting sleeve 63. In other embodiments, the length of the sleeve through groove 632 may also be equal to the axial length of the cylindrical portion. An adjusting sleeve groove 633 is provided on the outer periphery of the adjusting sleeve 63 at a radially opposite position to the sleeve through groove 632. The adjusting sleeve groove 633 cooperates with the limiting protrusion 6921 of the tee connector 69, and the two can be aligned so that the limiting protrusion 6921 slides into the adjusting sleeve groove 633 to realize the assembly of the adjusting sleeve 63 into the inner cavity of the tee connector 69.

[0085] See Figure 14 , 19 The structure of the sheath connector 62 is described below. The sheath connector 62 is a hollow structure with an inner cavity, which includes a first connecting hole 623 on the proximal side, a second connecting hole 621 on the distal side, and a stepped surface 622 connecting the first connecting hole 623 and the second connecting hole 621. In this embodiment, the inner diameter of the first connecting hole 623 is larger than the inner diameter of the second connecting hole 621, thus forming the stepped surface 622 at their connection. The stepped surface 622 is a conical surface, and its conical surface matches the conical surface 6922 of the tee connector, with their cone angles being equal or substantially equal. In this embodiment, the first connecting hole 623 is an internally threaded hole, and its thread matches the thread on the distal end side of the tee connector 69. This threaded hole enables a threaded connection between the sheath connector 62 and the distal end side of the tee connector 69. In other embodiments, the stepped surface can also be a straight surface perpendicular to the longitudinal axis.

[0086] See also Figure 15-16The structure of the exhaust device 500 is further explained below. After aligning the sleeve through groove 632 of the adjusting sleeve 63 with the limiting protrusion 6921 on the tee connector 69, the adjusting sleeve 63 is inserted into the inner cavity of the tee connector 69 and pushed along the proximal direction. At this time, the limiting protrusion 6921 slides in the sleeve through groove 632. When the end face of the adjusting sleeve groove 633 abuts against the distal face of the limiting protrusion 6921 and can no longer slide relative to it, it is installed in place. At this time, the adjusting sleeve 63 is fixedly housed in the main tube 692, and the conical surface 634 of the adjusting sleeve is flush with the conical surface 6922 of the tee connector on the distal face of the main tube 692, together forming a conical structure. In this embodiment, the adjusting sleeve 63 is axially limited by a matching limiting protrusion 6921 and an adjusting sleeve groove 633. After they are installed in place, the adjusting sleeve 63 cannot move further towards the proximal end relative to the tee connector 69. The length and relative position of the limiting protrusion 6921 and the adjusting sleeve groove 633 determine the position of the adjusting sleeve 63 within the tee connector 69 in the longitudinal direction. In this embodiment, the conical surface 634 of the adjusting sleeve is required to be flush with the conical surface 6922 of the tee connector. In other embodiments, a protrusion structure can be provided along the longitudinal axis on the adjusting sleeve, and a matching groove structure can be provided on the inner wall of the tee connector. After the adjusting sleeve 63 and the tee connector 69 are assembled, the adjusting sleeve 63 communicates with the branch pipe 691 of the tee connector 69 through the sleeve through groove 632 provided thereon. The sleeve through groove 632 is provided to prevent the adjusting sleeve 63 from blocking the branch pipe 691. Therefore, in this embodiment, there is no special requirement for the length of the through groove 632 along the longitudinal axis, as long as the branch pipe 691 of the tee connector is connected to the adjusting sleeve 63 after the adjusting sleeve 63 is installed relative to the tee connector 69. In this embodiment, the adjusting sleeve 63 has a certain length, and when installed in the tee connector 69, its proximal end face spans the branch pipe to ensure a stable connection between the tee connector 69 and the adjusting sleeve 63. In other embodiments, the length of the adjusting sleeve can be relatively shortened so that the adjusting sleeve is fixed to one side of the branch pipe. In this case, the end face of the adjusting sleeve inside the tee connector is closer to the far end relative to the connection port between the branch pipe and the main pipe. Since the shortened distance of the adjusting sleeve is only set on one side of the branch pipe and does not block the branch pipe, the through groove of the sleeve is not required.

[0087] See also Figure 15-16 A three-way structure 69 is installed in the housing assembly 61, and its branch pipe 691 extends radially out of the housing assembly 61 and communicates with the three-way valve assembly (not shown in the figure). A sealing gasket 67 is provided on the proximal end face of the main pipe 692, and an end cap 68 is connected to the outer periphery of the proximal end to press the sealing gasket 67 tightly. The sealing gasket 67 may be made of elastic sealing material such as silicone or rubber, and has a straight or cross-shaped cut on it for the guide wire or other sheath to pass through for sealing.

[0088] In this embodiment, the end cap 68 is provided with an internal thread, which engages with the external thread on the proximal outer circumference of the main tube 692 to form a threaded connection. By tightening the end cap 68, the sealing gasket 67 is pressed against the proximal end face of the main tube 692, thereby sealing the proximal outlet of the exhaust device. The distal end of the main tube 692 is threadedly connected to a sheath connector 62. The inner wall of the proximal side of the sheath 200 simultaneously abuts against the conical surface 634 of the sleeve and the conical surface 6922 of the tee connector, while the outer wall abuts against the inner wall of the stepped surface 622 of the sheath connector 62, so as to achieve that the distal outlet of the exhaust device is fixed and interconnected with the proximal end of the sheath 200.

[0089] See Figure 20-21 As shown, the adjusting sleeve 13 in this embodiment has multiple specifications, each compatible with a corresponding sheath specification. The function of the adjusting sleeve 13 in this embodiment is explained. The adjusting sleeve 13 in this embodiment can be adjusted according to the inner diameter of the sheath 200. See [link to relevant documentation]. Figure 20 As shown, the sheath 200 is fixed by being pressed together by the adjusting sleeves 13 on both sides and the sheath connector 13. When the wall of the sheath 200 becomes thicker and the inner diameter becomes smaller (as shown by the dotted line after it becomes smaller), at this time, while ensuring that other dimensions and shapes remain unchanged, the wall of the adjusting sleeve 13 can be made thicker and the inner diameter smaller accordingly, so that the inner diameter of the adjusting sleeve 13 is greater than or equal to the inner diameter of the adjusting sleeve 13. (Comparison) Figure 20-21 It can be seen that when the inner diameter of the adjusting sleeve 13 decreases, the size of its conical surface 634 increases accordingly. Therefore, the contact area between the inner wall of the sheath 200 and the conical surface 634 of the sleeve also increases accordingly. This allows for better clamping of the sheath 200 by the conical surface 634 of the sleeve, improving the connection stability and enhancing the sealing effect. Furthermore, the adjusting sleeve 13 changes accordingly when the inner diameter of the sheath 200 changes, ensuring that the inner diameter of the adjusting sleeve 13 is always less than or equal to the inner diameter of the sheath. When the inner diameter of the adjusting sleeve is equal to the inner diameter of the sheath, their inner cavities are flush at the connection point; when the inner diameter of the adjusting sleeve is less than the inner diameter of the sheath, the step formed faces the distal end. Therefore, when the exhaust fluid flows from the adjusting sleeve to the distal end of the sheath, the difference in their inner diameters will not obstruct the flow of the exhaust fluid, allowing for smoother flow. Therefore, in this embodiment, by providing a replaceable adjusting sleeve, a stable connection can be achieved with sheaths of different wall thicknesses, thereby allowing the delivery sheath to be replaced with sheaths of different wall thicknesses.

[0090] In other embodiments, the adjusting sleeve may be omitted, and the sheath may be clamped simply by a tee connector and a sheath connector. In other embodiments, the distal end face of the adjusting sleeve, the distal end face of the main tube, and the stepped surface of the sheath connector may all be set as straight surfaces.

[0091] Fourth embodiment

[0092] The conveying sheath in this embodiment is basically the same as the conveying sheath in the third embodiment. The only difference is that in this embodiment, the guide rail and the tee connector are fixed or set as an integral structure, and the sealing gasket and end cap are set on the near end face of the guide rail.

[0093] See Figure 22-24 As shown, the venting device 600 of the delivery sheath 3 in this embodiment includes a proximal seal 600a, a guide rail 14, and a sheath connector 600b. The proximal seal 600a includes an end cap 16 and a sealing gasket 15, and the sheath connector 600b includes an adjusting sleeve 13 and a sheath connector 12. Considering that the end cap 16, sealing gasket 15, adjusting sleeve 14, and sheath connector 12 in this embodiment are basically the same as in the previous embodiment, their specific structures will not be described in detail here. The venting device 600 is connected to the sheath 200, and air in the sheath 200 is expelled by introducing venting fluid (such as physiological saline) into the venting device 600.

[0094] See Figure 25-26 The structure of the guide rail component 14 in this embodiment is described below. The guide rail component 14 in this embodiment is a hollow structure with an inner cavity, including a guide rail body 142 and a tee connector 141 fixedly connected to the distal end of the guide rail body 142. The guide rail body 142 and the tee connector 141 can be integrally formed, in which case the guide rail component 14 includes both the guide rail body 142 and the tee connector 141. Alternatively, the guide rail body 142 and the tee connector 141 can be separately formed and then fixed, in which case the guide rail component 14 in this embodiment only includes the guide rail body 142 and not the tee connector 141. An external thread 1422 is provided on the outer periphery of the near-end face of the guide rail component 14. A through hole 1421 communicating with the inner cavity of the guide rail component 14 is provided on the side wall near the external thread 1422. The tee connector 141 includes a branch pipe 1411 and a main pipe 1412 that are interconnected. Similar to the third embodiment, in this embodiment, the distal end face of the main tube 1412 is provided with a three-way connector conical surface 1412, and the inner wall has a limiting protrusion 1413 extending along the longitudinal axis for cooperating with the adjusting sleeve 13.

[0095] See also Figure 23-24As shown, a sealing gasket 15 is provided on the proximal end face of the guide rail body 142, and an end cap 16 is connected to the proximal outer periphery to press the sealing gasket 15 tightly. A waterproof and breathable component 17 is provided on the through hole 1421 of the guide rail to seal it. The waterproof and breathable component 17 can be in the form of a waterproof and breathable membrane or a waterproof and breathable block. Its material is selected from at least one of PTFE, dialysis paper or breathable steel. It can allow small molecules of air to pass through but block large molecules of liquid, such as blood, water, and exhaust fluid. The branch pipe 1411 extends radially out of the housing assembly 11 and communicates with the three-way valve assembly (not shown in the figure). The distal end of the main pipe 1412 is detachably connected to a sheath connector 12, and the conical surface 1412 of the three-way connector of the main pipe 1414 abuts against the inner wall of the proximal side of the sheath 200, and the inner wall of the sheath connector 12 abuts against the outer wall of the sheath 200.

[0096] In this embodiment, the distal end of the adjusting sleeve 13 is provided with an adjusting sleeve conical surface 131, which has the same or substantially the same taper as the tee connector conical surface 1412. The adjusting sleeve 13 is fixedly housed in the main body tube 1412, and the adjusting sleeve conical surface 131 is flush with the tee connector conical surface 1412 and simultaneously abuts against the inner wall of the sheath tube 200.

[0097] When venting fluid is injected through branch pipe 1411, the venting fluid flows simultaneously along both the proximal and distal sides after entering tee connector 141. For the proximal side, the proximal opening is sealed by gasket 15, and a waterproof vent 17 is provided in the guide rail through hole 1421 on the sidewall near the proximal opening. Therefore, as the venting fluid gradually flows proximally, air in the cavity is expelled through the waterproof vent 17. However, because the proximal opening is sealed and the venting fluid cannot pass through the waterproof vent 17, the venting fluid will not flow out from the proximal side. For the distal side, the venting fluid flows into the sheath 200 through tee connector 141, thereby expelling air from the sheath and achieving the venting purpose.

[0098] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. The scope of protection of this patent should be determined by the appended claims.

Claims

1. An adjustable curved sheath, characterized in that, include: Housing assembly that extends along the longitudinal axis; Operate the knob by rotating it near the end of the housing assembly; A sheath, the proximal end of which extends into the housing assembly; An exhaust device is disposed on the distal side of the inner cavity of the housing assembly. The exhaust device includes a tee connector, which includes a branch pipe and a main pipe that are interconnected. The branch pipe extends radially out of the housing assembly. The proximal outlet of the main pipe is connected to a proximal closure member that can close it. The distal end of the main pipe is detachably connected to a sheath connector that can connect the distal outlet of the tee connector to the sheath. The adjustable curved sheath also includes a hollow guide rail with an inner cavity. The guide rail includes a guide rail body and a three-way connector. The guide rail body and the three-way connector are integrally formed. The three-way connector is fixedly connected to the distal end of the guide rail body. The proximal outlet of the guide rail constitutes the proximal outlet of the main tube. The distal outlet of the main tube is fixed to and connected to the proximal end of the sheath. The guide rail component has a through hole on its side wall that communicates with its inner cavity, and a waterproof and breathable component is provided on the through hole to seal it.

2. The adjustable curved sheath according to claim 1, characterized in that, The sheath connector includes a sheath connector head detachably connected to the distal end of the main tube, the inner wall of the proximal side of the sheath abutting against the distal end face of the main tube, and the outer wall of the proximal side of the sheath abutting against the inner wall of the sheath connector head.

3. The adjustable curved sheath according to claim 2, characterized in that, The sheath connector further includes an adjusting sleeve, which is received and confined within the inner cavity of the main tube, and the inner wall of the proximal side of the sheath abuts against the distal end face of the adjusting sleeve.

4. The adjustable curved sheath according to claim 3, characterized in that, The sheath connector includes a first connecting hole on the proximal side, a second connecting hole on the distal side, and a stepped surface connecting the first connecting hole and the second connecting hole, the stepped surface abutting against the outer wall of the sheath.

5. The adjustable curved sheath according to claim 4, characterized in that, The stepped surface is a conical surface, and the distal end of the main tube is provided with a three-way connector conical surface. The taper of the three-way connector conical surface is equal to or substantially equal to the taper of the stepped surface. The inner wall of the proximal side of the sheath is pressed against the three-way connector conical surface, and the outer wall of the proximal side of the sheath is pressed against the conical surface.

6. The adjustable curved sheath according to claim 5, characterized in that, The distal end face of the adjusting sleeve is a conical surface of the adjusting sleeve. The taper of the conical surface of the adjusting sleeve is equal to or substantially equal to the conical surface of the tee connector. The conical surface of the adjusting sleeve can be flush with the conical surface of the tee connector and simultaneously abut against the inner wall of the sheath.

7. The adjustable curved sheath according to claim 3, characterized in that, The inner diameter of the adjusting sleeve is less than or equal to the inner diameter of the sheath.

8. The adjustable curved sheath according to claim 1, characterized in that, The waterproof and breathable component is made of at least one of PTFE, dialysis paper, or breathable steel.

9. The adjustable bending sheath according to any one of claims 1-8, characterized in that, The proximal closure includes a sealing gasket and an end cap that can press the sealing gasket together. The sealing gasket is sealed to the proximal end face of the main tube or guide rail, and the end cap is connected to the proximal outer peripheral surface of the main tube or guide rail to press the sealing gasket together.

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