Conveying sheath tube

Abstract

The utility model relates to a conveying sheathing canal, which comprises a guide rail piece, a sheath piece and a sheath piece, the far end side of the sheath tube joint is connected with the near end of the guide rail piece; the near end of the sheathing canal penetrates through the cavity of the guide rail piece, then is inserted into the sheathing canal joint and is fixedly connected with the sheathing canal joint; the sheath tube connector is sleeved with the three-way connector, and the far end side of the three-way connector is fixedly connected with the near end of the guide rail piece. According to the conveying sheathing canal structure, the situation that the inner diameter of the sheathing canal is reduced due to the fact that the horn mouth arranged at the near end of the sheathing canal is extruded is avoided, and medical instruments can conveniently pass through the conveying sheathing canal.

Description

Technical Field

[0001] This utility model 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 arbitrary device release angle. It establishes and provides pathways for the release and retrieval of implanted devices. Adjustable sheaths enable clinicians to tackle complex surgical cases by overselecting appropriate sheath angles.

[0003] Currently available sheath-handle connection structures typically use a flared end for the sheath, clamped between two tapered components. Pressure is applied to secure the flared end between the tapered openings, thus fixing the sheath end in place. However, during this clamping process, the degree of clamping cannot be quantified or easily controlled. This can easily cause radial inward deformation of the transition area between the sheath body and the flared end, resulting in a smaller inner diameter of this transition area, or cause the end of one component to be excessively inserted into the transition area. These processes reduce the inner diameter of the cavity in the transition area, thus affecting the delivery of subsequent instruments. Utility Model Content

[0004] Based on this, it is necessary to address the aforementioned issues by providing a delivery sheath, comprising: a guide rail having a cavity and extending axially; a sheath connector having its distal end connected to the proximal end of the guide rail; a sheath having its proximal end passing through the cavity of the guide rail and inserted into the sheath connector and fixedly connected to the sheath connector; and a tee connector sleeved on the outside of the sheath connector and having its distal end fixedly connected to the proximal end of the guide rail.

[0005] Furthermore, the outer periphery of the sheath is bonded to the inner wall of the sheath joint.

[0006] Furthermore, the sheath connector has an internal thread, and the outer periphery of the proximal end of the sheath has an external thread that engages with the internal thread of the sheath connector.

[0007] Furthermore, it also includes an intermediate connector, in which the proximal end of the sheath is inserted and fixed, and the sheath connector is sleeved on the outer periphery of the intermediate connector and the two are threadedly connected.

[0008] Furthermore, the sheath connector has a stepped portion inside, and the proximal end face of the sheath abuts against the stepped portion of the sheath connector.

[0009] Furthermore, the distal end of the sheath connector has a plurality of sheath connector protrusions arranged circumferentially, and a sheath connector groove is formed between every two adjacent sheath connector protrusions; the proximal end of the guide rail has a plurality of connector protrusions arranged circumferentially, and a connector groove is formed between every two adjacent connector protrusions; the sheath connector protrusions are interference-fitted into the connector grooves, and the connector protrusions are interference-fitted into the sheath connector grooves.

[0010] Furthermore, the distal end of the sheath connector is provided with a distal insertion portion, and the sheath connector protrudes from the outer peripheral wall of the distal insertion portion; the proximal end of the guide rail has a flared portion for accommodating the distal insertion portion.

[0011] Furthermore, it also includes a first seal, the distal end of the guide rail having a seal receiving portion, the first seal being sleeved on the outer periphery of the sheath and located within the seal receiving portion.

[0012] Furthermore, it also includes a pressure cap, which covers the opening end of the sealing member receiving portion and abuts against the first sealing member.

[0013] Furthermore, the gland is engaged, threadedly connected, or bonded to the sealing element receiving portion.

[0014] Furthermore, the guide rail component is provided with a first slide rail and a second slide rail on its upper and lower sides, respectively; it also includes a first slider and a second slider with external threads, the first slider and the second slider sliding on the first slide rail and the second slide rail, respectively; it also includes a first thread, a second thread and a transmission sleeve, one end of the first thread is connected to the first slider and the other end is connected to a first position in the circumferential direction of the sheath tube, one end of the second thread is connected to the second slider and the other end is connected to a second position in the circumferential direction of the sheath tube; the inner wall of the transmission sleeve is provided with a figure-eight thread that can be screwed into the first slider and the second slider respectively, and the proximal end of the transmission sleeve has a knob; the rotation of the transmission sleeve will simultaneously drive the first slider and the second slider to move in opposite directions along the axial direction, thereby pulling the first thread or the second thread to deflect the sheath tube in the first direction or the second direction.

[0015] Furthermore, a first limiting member and a second limiting member are respectively fixedly provided on the proximal side of the first slide rail and the second slide rail. The distal side of the first limiting member can abut against the first slider, and the distal side of the first limiting member can abut against the second slider.

[0016] The technical solution of this utility model has the following beneficial effects:

[0017] This invention features a sheath connector at the proximal end of the sheath tube. This connector is fixedly connected to the tail end of the sheath tube, thus securing the sheath tube to the tee connector and guide rail, and ultimately, the sheath tube to the handle assembly. This fixing structure eliminates the need for a flared end at the proximal end of the sheath, preventing compression during fixing that could reduce the inner diameter of the proximal side of the sheath tube and affect instrument delivery. Furthermore, this fixing structure offers reliable connection and easy assembly, facilitating a secure connection between the sheath tube and the handle assembly and ensuring precise control during subsequent bending adjustments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the adjustable bendable sheath.

[0019] Figure 2 This is an exploded view of the overall structure of the adjustable bend sheath.

[0020] Figure 3 This is an overall sectional view of the adjustable bend sheath along its axial direction.

[0021] Figure 4 This is a three-dimensional structural diagram of the adjustable bending sheath after removing the outer shell and other components.

[0022] Figure 5 This is a structural diagram of the outer shell;

[0023] Figure 6A This is a structural diagram of the guide rail component;

[0024] Figure 6B A structural diagram of the guide rail component from another perspective;

[0025] Figure 7A This is a three-dimensional structural diagram of the sheath connector;

[0026] Figure 7B This is a cross-sectional view of the sheath connector;

[0027] Figure 8 for Figure 3 Enlarged view of point A in the image;

[0028] Figure 9 This is a partial exploded view including guide rail components, sheath joints, and tee joints;

[0029] Figure 10 This is a partial exploded view including the guide rail, the first seal, the gland, etc. Detailed Implementation

[0030] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented 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 this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0031] 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.

[0032] 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 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.

[0033] 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.

[0034] First Embodiment

[0035] See Figure 1 As shown, this embodiment provides an adjustable bending sheath 1, including a sheath 100 and a handle assembly 200. The proximal end of the sheath 100 is inserted into the handle assembly 200 and fixedly connected to the handle assembly 200. A sheath seat 90 is provided on the proximal side of the handle assembly 200. A catheter or other medical device, such as a vascular stent, filter or occluder, can be inserted through the sheath seat 90, thereby delivering the device into the sheath 100 and then into the target location on the human body.

[0036] Specifically, see Figure 2-4The overall structure of the delivery sheath 1 in this embodiment is described in detail below. The handle assembly 200 includes a housing assembly 60 extending along its longitudinal axis. For ease of processing and assembly, the housing assembly 60 can be designed to be split in half, i.e., the housing assembly 60 includes a first housing 61 and a second housing 62. Multiple connecting structures are provided at the connection points of the first housing 61 and the second housing 62, which can be snap-fit ​​structures and / or raised-groove structures. The first housing 61 and the second housing 62 are connected to each other via the connecting structures and, when snapped together, form a columnar housing assembly 60. The proximal end of the sheath 100 is inserted into and fixedly connected to the housing assembly 60; a guide rail 70 is fixedly disposed within the housing assembly 60; a slider assembly 110 includes a first slider 111 and a second slider 112. The first slider 111 is slidably disposed on the upper side of the guide rail 70; the second slider 112 is slidably disposed on the lower side of the guide rail 70; and a wire 140 includes a first wire 141 and a second wire 142. The first thread 141 is connected at one end to the first slider 111 and at the other end to the first position of the sheath 100 in the circumferential direction; the second thread 142 is connected at one end to the second slider 112 and at the other end to the second position of the sheath 200 in the circumferential direction; the transmission sleeve 50 has an internal thread, and the first slider 111 and the second slider 112 are both disposed inside the transmission sleeve 50, and the external threads on the two sliders are engaged with the internal threads on the transmission sleeve 50. By rotating the transmission sleeve 50, the first slider 111 and the second slider 112 can be driven to move in opposite directions along the axial direction on the guide rail, thereby causing the sheath 100 to deflect in the first direction or the second direction through the first thread 141 or the second thread 142, thereby realizing the bending operation of the sheath 100.

[0037] See Figure 5The structure of the transmission sleeve 50 is described below. The transmission sleeve 50 includes a threaded portion 51 and a knob 52 fixedly disposed near the proximal end of the threaded portion 51. In this embodiment, the threaded portion 51 and the knob 52 are integrally formed, that is, the transmission sleeve 50 is manufactured by integral molding. The threaded portion 51 is cylindrical in shape, and its inner wall is provided with a figure-eight thread 53, which includes a first internal thread and a second internal thread arranged in a cross configuration. The first internal thread and the second internal thread have opposite directions of rotation. When the first internal thread is a left-hand thread, the second internal thread is a right-hand thread, or when the first internal thread is a right-hand thread, the second internal thread is a left-hand helical thread. The specific rotation directions of the first internal thread and the second internal thread 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. In this embodiment, one of the first internal thread and the second internal thread engages with the external thread of the first slider 111 to form a threaded transmission pair, and the other of the first internal thread and the second internal thread engages with the second slider 112 to form another threaded transmission pair, thereby enabling the threaded part 51 to simultaneously engage with both the first slider 111 and the second slider 112. The operating knob 60 has a cylindrical external structure, and its outer wall is provided with anti-slip components, such as striped structures, threaded structures, and protrusion structures, to facilitate the operator's turning. In this embodiment, for ease of processing and assembly, the transmission sleeve 50 is designed to be split in half from the middle, including a first transmission sleeve 51 and a lower transmission sleeve 52, which can be fixedly assembled by a snap-fit ​​structure.

[0038] See Figures 6A-6B The structure of the guide rail component 70 is described below. For details, see [link to documentation]. Figure 6A As shown, the guide rail component 70 has a cavity and extends axially, including a guide rail body 71, and a proximal connector 72 is provided on the proximal side of the guide rail body 71. The upper and lower sides of the guide rail body 71 are respectively provided with an upper slide rail 711 and a lower slide rail 712, which are slidably connected to the first slider 111 and the second slider 112, respectively. The proximal connector 72 is generally in the shape of a hollow sleeve, with a guide rail thread 721 on its outer periphery, and multiple spaced connector protrusions 724 are provided on the proximal end face along the circumferential direction. The connector protrusions 724 are evenly or unevenly distributed in the circumferential direction, and a connector groove 723 is formed between every two adjacent connector protrusions 724. In addition, a flared portion 722 is provided on the proximal side of the proximal connector 72. The inner diameter of the flared portion 722 is larger than the inner diameter of the main body of the connector 72. The flared portion 722 extends a certain distance from the proximal side of the opening of the connector 72 to the distal side and terminates thereafter. A stepped structure is formed at the termination point.

[0039] See Figure 6BAs shown, a flange portion 73 is provided on the proximal side of the guide rail body 71, and a sealing element receiving portion 74 is provided on the flange portion 73. In this embodiment, the sealing element receiving portion 74 is an annular protrusion structure provided on the flange portion 73, the inner cavity of which can accommodate the first sealing element 93, and the interior has a stepped abutment portion 75 to axially limit the first sealing element 93. In other embodiments, the sealing element receiving portion 74 can also be formed by directly slotting on the flange 73. A guide rail fixing portion 76 is provided on one or both sides of the outer periphery of the sealing element receiving portion 74, which cooperates with the protruding rib provided inside the housing assembly 60 to realize the fixed connection between the housing assembly 60 and the guide rail 70. In addition, in this embodiment, a guide rail proximal end protrusion 741 is provided on the distal end face of the sealing element receiving portion 74, which is used to cooperate with the pressure cap 30 to realize the snap-fit ​​fixation between the two.

[0040] See also Figure 2-4 As shown, the upper and lower sides of the guide rail 70 are respectively provided with an upper slide rail 711 and a lower slide rail 712. A first slider 111 and a first wire fixing block 121 are slidably arranged on the upper slide rail 711, and a second slider 112 and a first wire fixing block 122 are slidably arranged on the lower slide rail 712. The first wire fixing block 121 is disposed on the proximal side of the first slider 111 and can abut against the first slider 111. The proximal end of the first wire 141 is fixedly connected to the first wire fixing block 121, and the distal end passes through the first wire fixing block 121 and the first slider 111 in sequence and is fixedly connected to the sheath tube 100 at a first position in the circumferential direction. The second wire fixing block 122 is disposed on the proximal side of the second slider 112 and can abut against the second slider 112. The proximal end of the second wire 142 is fixedly connected to the second wire fixing block 122, and the distal end passes through the second wire fixing block 122 and the second slider 112 in sequence and is fixedly connected to the sheath tube 100 at a second position in the circumferential direction. A first limiting member 131 is also fixedly disposed on the upper slide rail 711 of the guide rail 70. The first limiting member 131 is located at the proximal end of the upper slide rail and at the proximal side of the first wire fixing block 121, and its specific position is determined by the specific stroke of the first slider 111. When the first slider 111 slides to the end of its stroke near the proximal end, the first wire fixing block 121 abuts against the first limiting member 131, preventing the first slider 111 from moving further near the proximal end, thus limiting the movement of the first slider 111. A second limiting member 132 is also fixedly installed on the lower slide rail 712 of the guide rail 70. The second limiting member 132 is located near the proximal end of the lower slide rail and near the proximal end of the second wire fixing block 122; its specific position is determined by the specific stroke of the second slider 111. When the second slider 112 slides to the end of its stroke near the proximal end, the second wire fixing block 122 abuts against the second limiting member 132, preventing the second slider 112 from moving further near the proximal end, thus limiting the movement of the second slider 112.

[0041] The guide rail 70 is fixedly disposed within the housing assembly 60, and its proximal end is fixedly connected to a sheath seat 90. The sheath seat 90 includes a tee connector 91, a second seal 92, and an end cap 93. The second seal 92 can be a silicone sealing ring, installed on the proximal end of the tee connector 91 to seal its proximal opening, ensuring the sealing performance of the proximal side of the sheath 100 and the dynamic sealing performance during instrument passage. Furthermore, since the guide rail 70 is connected to the tee connector 91, and the second seal 92 seals the proximal opening of the tee connector 91, it also seals the proximal side of the guide rail 70. The end cap 93 is fitted around the outer periphery of the second seal 92 and fixedly connected to the proximal end of the tee connector 91 to secure the second seal 92 and prevent it from falling off relative to the tee connector 91. A three-way valve assembly (not shown in the figure) is connected to the branch side of the tee connector 91. The three-way valve assembly includes a three-way valve and a hose. One end of the hose is connected to a vertical branch, and the other end is connected to the three-way valve. In actual use, liquid can be injected into the three-way valve and then into the sheath 100 to vent the air from the sheath 100. The knob 52 and the sheath seat 90 are both located on the proximal side of the handle assembly 200, allowing the operator to rotate the knob 52 with one hand for adjustment, while simultaneously using the other hand to advance catheters or guidewires, thus improving operational convenience.

[0042] The proximal end of the sheath 110 passes through the guide rail 70 and is inserted into the tee connector 91, where it is fixedly connected. Specifically, a sheath connector 80 is fixedly connected to the proximal end of the guide rail 70. The proximal end of the sheath 100 passes through the guide rail 70 and is inserted into the sheath connector 80, where it is fixedly connected. The tee connector 91 is sleeved on the outside of the sheath connector 80, and its distal end is fixedly connected to the proximal end of the guide rail 70. Through this structure, the guide rail 70, sheath connector 80, tee connector 91, and sheath 110 are fixedly connected, allowing them to be assembled as a whole into the housing assembly 60, facilitating assembly, cleaning, and disassembly.

[0043] A protective sleeve, flared in shape, is attached to the distal end of the housing assembly 60. The sleeve is made of an elastic material such as silicone or rubber. The proximal end of the sheath 100 passes through the distal end of the protective sleeve 10 and enters the cavity of the housing assembly 60. The protective sleeve 10 is fitted around the outer periphery of the sheath 100 and located at the entrance of the sheath 100 into the housing assembly 60 to prevent the sheath from breaking due to excessive bending at this entrance. Additionally, a sheath fixing member 20 is provided near the protective sleeve 10. The sheath fixing member 20 is fitted around the outer periphery of the sheath 100 and fixedly installed inside the housing assembly 60 to securely mount the sheath 100 onto the housing assembly 60.

[0044] See Figures 7A to 7BThe structure of the sheath connector 80 is described below. The sheath connector 80 is generally a sleeve structure, with multiple sheath connector protrusions 82 spaced circumferentially on its distal side. A sheath connector groove 83 is formed between adjacent sheath connector protrusions 82. The sheath connector protrusions 82 may be evenly or unevenly distributed in the circumferential direction. In addition, a distal insertion portion 81 is provided on the distal side of the sheath connector 80. The distal insertion portion 81 is an annular protrusion extending distally, with an inner diameter equal to the inner diameter of the sheath connector 80 and an outer diameter smaller than the outer diameter of the sheath connector 80. The sheath connector protrusions 82 are integrally formed on the outer periphery of the distal insertion portion 81, that is, the outer peripheral wall of the distal insertion portion 81 is integrally fitted with the sheath connector protrusions 82. In this embodiment, the length of the distal insertion portion 81 along the axial direction is greater than the length of the sheath connector protrusion 82. Its length and outer diameter match the length and inner diameter of the enlarged portion 722 of the catheter fitting 70, so that the distal insertion portion 81 can be inserted into the enlarged portion 722. See also... Figure 7B As shown, a sheath joint step 84 is also provided inside the sheath joint 80. The sheath joint step 84 faces the distal end of the sheath joint 80, that is, the inner diameter of the first inner hole 85 on the distal end of the sheath joint 80 is larger than the inner diameter of the second inner hole 86 on the proximal end. The sheath joint step 84 is formed at the intersection of the first inner hole 85 and the second inner hole 86.

[0045] See Figure 8As shown, the proximal end of the sheath tube 100 is inserted into the sheath tube connector 80, and its proximal end face can abut against the stepped portion 84 of the sheath tube connector to axially position the sheath tube 100. In this embodiment, the proximal end of the sheath tube 100 and the sheath tube connector 80 can be fixedly connected by adhesive. The adhesive methods in this embodiment include bonding, hot melting, welding, injection molding, etc. For example, adhesive can be applied to the outer wall of the sheath tube 100 to achieve bonding between the outer periphery of the sheath tube 100 and the inner wall of the sheath tube connector 80. In other embodiments, the two can also be fixedly connected by a threaded connection. Specifically, an external thread can be provided on the outer side of the proximal end of the sheath tube 100, and an internal thread matching the external thread can be provided on the inner wall of the tee connector 91, and the two can be directly connected by the thread. Alternatively, an intermediate connector can be provided, with the proximal end of the sheath 100 inserted into this intermediate connector and the two fixedly connected. The sheath connector is sleeved on the outer circumference of the intermediate connector and the two are threadedly connected, thereby achieving an indirect threaded connection between the sheath 100 and the tee connector 91. Furthermore, in this embodiment, a tail enlargement section 101 is provided at the tail end of the sheath 100, i.e., at the connection point between the sheath 100 and the sheath connector 80. The length of the tail enlargement section 101 is greater than or equal to its connection length with the sheath connector 80, and its inner diameter is greater than the inner diameter of the main body of the sheath 100 (referring to the parts other than the enlargement section 101). Specifically, the inner diameter of the tail enlargement section 101 is 5% to 35% greater than the inner diameter of the main body of the sheath 100. This is to account for the fact that during the process of inserting the tail end of the sheath into the sheath connector 80 to achieve the connection, the outer wall of the tail end of the sheath may be squeezed by the inner wall of the sheath connector 80, causing the inner diameter of the tail end of the sheath to decrease. Therefore, in this embodiment, the tail end of the sheath is set in the form of a tail enlargement section 101 to ensure that even after being squeezed, the inner diameter of the tail end of the sheath is greater than or equal to the inner diameter of the main body of the sheath 100, thereby avoiding the passage of the instrument due to the smaller inner diameter of the tail end of the sheath.

[0046] See Figure 9As shown, the sheath connector 80 is fixedly connected to the proximal end of the guide rail component 70 via a snap-fit ​​mechanism. During the connection process, on one hand, the distal insertion portion 81 of the sheath connector 80 can be inserted into the flared portion 722 of the guide rail component 70; on the other hand, during the insertion of the sheath connector 80 into the flared portion 722 of the guide rail component 70, the sheath connector protrusion 82 of the sheath connector 80 can be inserted into the connector groove 723 of the guide rail component 70, and the connector protrusion 724 of the guide rail component 70 can be inserted into the sheath connector groove 83 of the sheath connector 80, thereby achieving a snap-fit ​​connection between the sheath connector 80 and the proximal end of the guide rail component 70. In this embodiment, the snap-fit ​​method is an interference fit, thereby achieving a fixed connection between the sheath connector 80 and the guide rail component 70. Therefore, the distal insertion part 81 serves two purposes: firstly, it provides a guiding function, making it easier to align the sheath connector 80 and the guide rail 70, thus facilitating the subsequent alignment and insertion of the protrusions and grooves and improving their engagement efficiency; secondly, the interference fit between the distal insertion part 81 and the flared part 722 further strengthens the connection between the sheath connector 80 and the guide rail 70, preventing them from loosening. Additionally, the tee connector 91 has an internal thread, which is fitted around the outer circumference of the sheath connector 80 and threadedly connected to the guide rail thread 721 of the guide rail 70, thereby achieving a fixed connection of the tee connector 91.

[0047] In summary, in this embodiment, the distal end of the sheath connector 80 is fixedly connected to the proximal end of the guide rail 70, while the sheath 100 is inserted and fixed inside the sheath connector 80. The tee connector 91 is sleeved on the sheath connector 80 and then fixedly connected to the guide rail 70, thereby achieving a fixed connection between the sheath 100 and the tee connector 91, thus securing the proximal end of the sheath 100. This configuration prevents the sheath 100 from rotating axially or becoming loose, and prevents changes in the direction of force applied to the sheath by the bending wire during bending, which could cause the sheath to twist and affect the bending effect. The three-way connector 91, sheath connector 80, and guide rail 70 are fixed together to form an assembly. This assembly forms a rotating support shaft. The knob 52 is sleeved on the outer surface of this assembly and can rotate around the rotating support shaft, thereby adjusting the distal end of the sheath 100. In addition, the assembly is provided with a sealing assembly (including a second seal 92 and an end cap 93) on the distal side to ensure the sealing performance of the distal end of the guide rail 70 and prevent blood leakage or leakage during the operation.

[0048] See Figure 3 , 10The distal sealing structure of the guide rail component 70 is described below. In this embodiment, the sheath tube 100 extends axially from the interior of the guide rail component 70. Due to the clearance fit for easy assembly, an annular gap exists between the outer wall of the sheath tube 100 and the inner wall of the guide rail component 70, with the opening of this annular gap located on the distal side of the guide rail component 70. During the cleaning and disinfection of the sheath tube, liquid flows into this annular gap along its opening. Because this annular gap is long and narrow with a small radial dimension, methods such as air blowing cannot effectively remove the liquid from it, leading to incomplete disinfection or microbial residue. To address these issues, this embodiment seals the opening of the annular gap. Specifically, a first seal 40 is provided in the sealing member receiving portion 74 of the guide rail component 70. The first seal 40 is interference-fitted onto the outer periphery of the sheath tube 100, thereby assembling the first seal 40 between the outer peripheral wall of the sheath tube 100 and the inner wall of the sealing member receiving portion 74 to seal the gap entrance (i.e., the annular gap opening) between the inner wall of the distal end of the guide rail component 70 and the outer wall of the sheath tube, preventing liquid from entering the annular gap during cleaning. In addition, to better limit the first seal 40, a pressure cap 30 is also provided at the opening of the sealing member receiving portion 74. The pressure cap 30 is disc-shaped, and at least two pressure cap grooves 31 are provided at intervals on its outer periphery. Each pressure cap groove 31 is interference-fitted with each guide rail proximal end protrusion 741, thereby achieving a fixed connection between the pressure cap 30 and the sealing member receiving portion 74. In this embodiment, an interference fit with a protrusion-groove structure is used to fix the cap 30 to the near end of the guide rail. This protrusion-groove structure can reduce the overall outer diameter of the sealing element receiving portion 74, avoiding interference between the sealing element receiving portion 74 and the first wire 141 or the second wire 142, which would affect the bending performance. In other embodiments, the cap 30 and the sealing element receiving portion can also be fixedly connected by a threaded connection or adhesive bonding. In addition, the near end side of the cap 30 has a cap protrusion 32. During the specific assembly process, the first sealing element 40 is placed in the sealing element receiving portion 74, and then the cap groove 31 of the cap 30 is aligned with the near end protrusion 741 of the guide rail to achieve the snap-fit. After the cap 30 is installed in place, the two ends of the first sealing element 40 are squeezed by the abutment portion 75 and the cap protrusion 32, respectively, to axially limit the two ends and prevent the first sealing element 40 from shifting or loosening. In other embodiments, the pressure cap 30 may be omitted, and the distal end of the first seal 40 may be engaged with the limiting rib on the inner wall of the housing assembly 60, which can also achieve the limiting of the first seal 40.

[0049] In this embodiment, the aforementioned sealing structure is provided on the distal end of the guide rail 70. On one hand, by sealing the annular gap opening on the distal end of the guide rail 70, liquid can be prevented from flowing into the annular gap during cleaning. On the other hand, the presence of the first seal 40 eliminates the annular gap on the distal end between the guide rail 70 and the sheath 100, preventing the sheath 100 from wobbling during bending, ensuring the control accuracy of the bending shape and angle, and effectively transmitting the expected bending angle and shape, thus improving the controllability and precision of the bending operation. Furthermore, eliminating the gap also prevents the sheath 100 from being damaged due to excessive bending at the gap.

[0050] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. The protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A delivery sheath, characterized in that, include: The guide rail (70) has a cavity and extends axially; The distal end of the sheath connector (80) is connected to the proximal end of the guide rail (70); The sheath (100) is inserted into the sheath joint (80) after its proximal end passes through the cavity of the guide rail (70) and is fixedly connected to the sheath joint (80); A tee connector (91) is sleeved on the outside of the sheath connector (80) and its distal end is fixedly connected to the proximal end of the guide rail (70).

2. The delivery sheath according to claim 1, characterized in that, The sheath (100) has a tail enlargement section (101) with an inner diameter larger than the main body inner diameter of the sheath (100) on its proximal side, and the tail enlargement section (101) is connected to the sheath connector (80).

3. The conveying sheath according to claim 2, characterized in that, The outer wall of the sheath (100) is bonded to the inner wall of the sheath connector (80).

4. The delivery sheath according to claim 2, characterized in that, The sheath connector (80) has an internal thread, and the outer periphery of the proximal end of the sheath (100) has an external thread that engages with the internal thread of the sheath connector.

5. The delivery sheath according to claim 2, characterized in that, It also includes an intermediate connector, in which the proximal end of the sheath is inserted and fixed, and the sheath connector is sleeved on the outer periphery of the intermediate connector and the two are threaded together.

6. The delivery sheath according to claim 1, characterized in that, The sheath connector (80) has a sheath connector step portion (84) inside, and the proximal end face of the sheath (100) abuts against the sheath connector step portion.

7. The delivery sheath according to claim 1, characterized in that, The distal end of the sheath connector (80) has a plurality of sheath connector protrusions (82) arranged circumferentially, and a sheath connector groove (83) is formed between every two adjacent sheath connector protrusions (82); the proximal end of the guide rail (70) has a plurality of connector protrusions (724) arranged circumferentially, and a connector groove (723) is formed between every two adjacent connector protrusions (724); the sheath connector protrusions (82) are interference-fitted into the connector grooves (723), and the connector protrusions (724) are interference-fitted into the sheath connector grooves (83).

8. The delivery sheath according to claim 7, characterized in that, The distal end of the sheath connector (80) is provided with a distal insertion part (81), and the proximal end of the guide rail (70) has a flared part (722) for accommodating the distal insertion part (81).

9. The delivery sheath according to claim 1, characterized in that, It also includes a first seal (40), the distal end of the guide rail (70) having a seal receiving portion (74), the first seal being sleeved on the outer periphery of the sheath (100) and located within the seal receiving portion (74).

10. The delivery sheath according to claim 9, characterized in that, The sealing member receiving portion (74) is provided with an abutment portion (75) inside, and the proximal end of the first sealing member (40) abuts against the abutment portion (75).

11. The delivery sheath according to claim 10, characterized in that, It also includes a pressure cap (30) which covers the opening end of the sealing member receiving portion (74) and abuts against the distal side of the first sealing member (40).

12. The delivery sheath according to claim 11, characterized in that, The gland is engaged, threaded, or bonded to the sealing element receiving portion.

13. The delivery sheath according to any one of claims 1-12, characterized in that, The guide rail component (70) is provided with a first slide rail (711) and a second slide rail (712) on its upper and lower sides, respectively; it also includes a first slider (111) and a second slider (112) with external threads, the first slider (111) and the second slider (112) sliding on the first slide rail and the second slide rail, respectively; it also includes a first thread (141), a second thread (142) and a transmission sleeve (50), one end of the first thread is connected to the first slider and the other end is connected to a first position in the circumferential direction of the sheath tube, one end of the second thread is connected to the second slider and the other end is connected to a second position in the circumferential direction of the sheath tube; the inner wall of the transmission sleeve is provided with a figure-eight thread that can be screwed into the external threads of the first slider and the second slider, respectively, and a knob is integrally provided on the proximal side of the transmission sleeve; rotating the knob will simultaneously drive the first slider and the second slider to move in opposite directions along the axial direction, thereby pulling the first thread or the second thread to deflect the sheath tube in the first direction or the second direction.

14. The delivery sheath according to claim 13, characterized in that, A first limiting member (131) and a second limiting member (132) are fixedly provided on the proximal side of the first slide rail (711) and the second slide rail (712), respectively. The distal side of the first limiting member (131) can abut against the first slider, and the distal side of the second limiting member (132) can abut against the second slider.

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