A sheath, introducer sheath, and endoscope assembly

Abstract

The present application provides a sheath, a guide sheath and an endoscope assembly, relates to the technical field of medical devices, and solves the problem of excessively large bending radius of the insertion part. The endoscope assembly comprises an endoscope and a guide sheath used in cooperation, and the sheath of the guide sheath comprises a tube body and a support rod. The support section and the control section of the support rod are movably arranged on the inner side and the outer side of the lumen of the tube body respectively, and the distal end of the control section is fixed to the distal end of the support section. Since the proximal end of the support section is fixed to the tube wall of the tube body, when the length of the support rod inserted into the lumen increases, the rod section of the support rod located in the lumen will be radially expanded, so that the support section is arched towards the center of the lumen, thereby the bending tube of the insertion part of the endoscope can be clamped by the support section, and the bending tube is combined with the tube wall of the tube body of the sheath, so that the rigidity and bending resistance of the clamped part of the bending tube are strengthened, and then a section of the bending tube located on the distal end side of the clamped part can be more easily bent in advance, so as to reduce the bending radius of the bending tube.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a sheath, a guide sheath, and an endoscope assembly. Background Technology

[0002] A guide sheath consists of a sheath base and a sheath tube installed distal to the base. It is a commonly used auxiliary instrument in endoscopic treatment and diagnosis, often used in conjunction with an endoscope for intraoperative lithotripsy. The inner wall of the sheath forms a lumen for the insertion portion of the endoscope to pass through, while the gap between the lumen and the inserted portion serves as a passageway for the stone. During use, the distal end of the guide sheath passes through the urethra, bladder, and ureter to reach the renal pelvis. Guided by the guide sheath, the insertion portion of the endoscope exits from the distal end into the renal pelvis or calyces.

[0003] After the endoscope's insertion section enters the renal pelvis, the distal end of the curved tube needs to be continuously adjusted to search for stones. When reaching stones at tricky angles or in the lower calyx, the bending radius of the insertion section's curved tube is fixed, and the tube bends sequentially from proximal to distal during the bending process, resulting in a large bending radius. This excessively large bending radius makes it difficult for the insertion section to quickly and smoothly locate itself in the confined space of the renal pelvis and reach the desired position. Summary of the Invention

[0004] The purpose of this invention is to design a sheath, a guide sheath, and an endoscope assembly to solve the problem of excessive bending radius of the insertion part.

[0005] This invention is achieved through the following technical solution: In a first aspect, some embodiments of the present invention provide a sheath comprising a tube body and a support rod. The tube body includes a tube wall extending axially from a proximal end to a distal end and a cavity circumferentially enclosed by the tube wall. The support rod includes a support section movably disposed inside the cavity and a control section movably disposed outside the cavity, both the support section and the control section extending axially along the tube body. The distal end of the control section extends radially and is fixedly connected to the distal end of the support section, the proximal end of the support section being fixedly connected to the tube wall; the control section is controllably movable axially relative to the tube body to adjust the distal end of the control section between a first position and a second position. When the distal end of the control section is in the first position, the distal end of the control section is located outside the cavity, and the support section extends straight along the inner circumferential wall of the cavity. When the distal end of the control section is in the second position, the distal end of the control section is located inside the cavity, and the support section is arched towards the center of the cavity.

[0006] Secondly, some embodiments of the present invention provide a guiding sheath, the guiding sheath comprising a sheath seat and the aforementioned sheath tube, the proximal end of the sheath tube being fixed to the distal end of the sheath seat.

[0007] Thirdly, some embodiments of the present invention provide an endoscope assembly comprising an endoscope and the aforementioned guide sheath.

[0008] The present invention has the following advantages and beneficial effects: In this invention, the guide sheath uses a sheath tube comprising a tube body and a support rod movably disposed on the tube body. Because the support section of the support rod is movably located inside the lumen of the tube body, and the control section is movably located outside the lumen of the tube body, with the distal end of the control section connected to the distal end of the support section, the length of the support rod extending into the lumen of the tube body can be adjusted during the axial movement of the control section. Furthermore, since the proximal end of the support section is fixed to the tube wall, as the length of the support rod extending into the lumen increases, the section of the support rod within the lumen will radially expand, causing the support section to arch towards the center of the lumen. This arched support section can then be used to clamp the curved tube of the endoscope insertion point located there, connecting the curved tube to the tube wall of the sheath. The tube wall strengthens the rigidity and bending resistance of the clamped portion of the curved tube, making it more difficult to bend. Consequently, the distal end of the curved tube at the clamped portion can be bent more easily, temporarily reducing the bending radius of the curved tube. This allows the insertion point to be positioned quickly and easily in confined spaces such as the renal pelvis, achieving the desired location smoothly. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a perspective schematic diagram of the guide sheath in some embodiments of this application; Figure 2 yes Figure 1 An enlarged schematic diagram of part A in the middle, showing that the far end of the support rod in the figure is in a contracted state; Figure 3 yes Figure 1 A sectional view of part A in the middle; Figure 4 This is a partial schematic diagram of the distal end of the guide sheath in some embodiments of this application, where the distal end of the support rod is in an expanded state. Figure 5 yes Figure 4A sectional view of the partial structure shown; Figure 6 The connection structure between the sheath and the control element is shown in some embodiments of this application; Figure 7 This is a perspective view of a guide sheath in some embodiments of this application, with the layout of the sheath and control components shown in dashed lines. Figure 8 This is a schematic diagram of a partial proximal structure of the guide sheath in some embodiments of this application, where a control element is hidden. Figure 9 This is a partial sectional view of the proximal end of a guide sheath in some embodiments of this application; Figure 10 This is a schematic diagram of the engagement of the endoscope assembly at the distal end in some embodiments of this application; Figure 11 This is a schematic diagram of the insertion of an endoscope assembly into the kidney in some embodiments of this application. The red lines in the diagram represent the insertion portion of the endoscope.

[0011] The diagram is marked as follows: 100. Sheath; 110. Tube body; 111. Tube wall; 111a. Inner tube wall; 111b. Spiral tube wall; 111c. Outer tube wall; 1111. Channel; 112. Lumen; 113. Catheter; 120. Support rod; 121. Support section; 122. Control section; 200, Sheath base; 210, Housing; 211, Mounting hole; 220, Control element; 221, Push button; 222, Connecting rod; 300. Guiding sheath; 410. Insertion part; 411. Bending tube; M, the clamped part. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0013] In the description of this application, it should be noted that, unless otherwise stated, "multiple" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0014] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0015] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0016] In the various embodiments of this application, "proximal end" and "far end" refer to the position of each component relative to the user in the usage environment. The end closer to the user is designated as the "proximal end", and the end farther from the user is designated as the "far end".

[0017] Embodiments of this application disclose a sheath 100, a guide sheath 300, and an endoscope assembly. The endoscope assembly includes a guide sheath 300 and an endoscope for use. (See reference...) Figure 10 and Figure 11When the endoscopic assembly is used for renal lithotripsy, the guide sheath 300 can expand radially toward the center of the lumen 112 by controlling the support rod 120 to clamp the curved tube 411 on the insertion part of the endoscope. Simultaneously, at least a portion of the rigidity of the sheath 100 body 110 is added to the clamped portion M of the curved tube 411 to increase the difficulty of bending at the clamped portion M, thereby making it easier to bend the curved tube 411 distal to the clamped portion M, thus changing the bending radius of the curved tube 411. Clamping different axial portions of the curved tube 411 will correspondingly change the bending radius of the curved tube 411.

[0018] The following is in conjunction with the appendix Figures 1-11 The application provides a detailed description of the sheath 100, guide sheath 300, and endoscope assembly through specific embodiments and application scenarios.

[0019] In a first aspect, embodiments of this application disclose a sheath 100, such as Figure 1 The sheath 100, as part of the guide sheath 300, is used to connect with the sheath seat 200.

[0020] like Figures 2-6 As shown, the sheath 100 includes a tube body 110 and a support rod 120 movably connected to the tube body 110. The distal end of the support rod 120 is located at the distal end of the tube body 110 and within the lumen 112 of the tube body 110. Simultaneously, the proximal end of the support rod 120 is located on the proximal side of the tube body 110 and can be manipulated by the user, allowing the proximal and middle sections of the support rod 120 to move axially relative to the tube body 110, thereby allowing the distal end of the support rod 120 to move as shown in the diagram. Figure 2 and Figure 3 The contraction state shown and as Figure 4 and Figure 5 Switching between the expansion states shown.

[0021] Specifically, such as Figure 1 and Figure 6 As shown, the tube body 110 includes a tube wall 111, which has a certain rigidity and can resist forces that would cause it to collapse radially. The tube wall 111 extends axially from the proximal end to the distal end, and the inner side of the tube wall 111 has an axially penetrating lumen 112 formed by its circumferential enclosure. The proximal port of the lumen 112 is formed on the proximal end face of the tube body 110, and the distal port is formed on the distal end face of the tube body 110. The lumen 112 is used to guide the insertion part 410 (represented by the red line in the figure) of the endoscope inserted therein through axial movement, so that the insertion part 410 can extend into the lumen 112 from the proximal port and extend out from the distal port of the lumen 112. Figure 11 The intrarenal environment shown in the diagram.

[0022] like Figure 3As shown, the support rod 120 extends along the axial direction of the tube body 110, and at the distal end of the tube body 110, it forms a portion that bends towards the proximal end, forming a support section 121 and a control section 122 that are axially connected as a single unit. The support section 121 is movably disposed inside the cavity 112 and extends along the axial direction of the tube body 110; the control section 122 is movably disposed outside the cavity 112 and extends along the axial direction of the tube body 110 from the proximal end to the distal end of the tube body 110.

[0023] Since the support section 121 and the control section 122 of the support rod 120 are located inside and outside the cavity 112 formed by the pipe wall 111, respectively, reference Figure 3 The distal end of the control section 122 extends radially toward the lumen 112, passes through at least a portion of the pipe wall 111, and is fixedly connected to the distal end of the support section 121.

[0024] The proximal end of the support segment 121 is fixedly connected to the pipe wall 111, allowing the distal end of the support segment 121 to move relative to this connection point, thereby achieving the straight extension shape of the support segment 121 as shown in the figure and... Figure 5 The diagram shows transitions between arched, curved shapes. (Reference) Figure 7 and Figure 10 The support section 121 of the support rod 120 is integrally arranged at the distal end of the tube body 110, and the length of the support section 121 is less than the length of the control section 122. The support section 121 can be connected at the distal end of the tube body 110 to the curved tube 411 of the endoscope insertion part 410, so that the section of the curved tube 411 extending out of the lumen 112 can be bent first relative to its proximal side.

[0025] refer to Figure 6 , Figure 3 and Figure 5 The proximal end of the control segment 122 can be controllably moved axially relative to the tube body 110, causing the proximal end of the control segment 122 to axially approach or move axially away from the proximal end face of the tube body 110. This allows the control segment 122 as a whole to advance or retract axially relative to the tube body 110, thereby enabling the distal end of the control segment 122 to be adjusted between a first position located outside the lumen 112 and a second position located inside the lumen 112. Figure 3 The control section 122 shown is located entirely outside the lumen 112; Figure 5 The distal portion of the control section 122 shown extends into the lumen 112, causing... Figure 5 The length of the support rod 120 extending into the lumen 112 shown is relatively... Figure 3 The longer one.

[0026] like Figure 3As shown, when the distal end of the control section 122 is in the first position, the distal end of the control section 122 is located outside the lumen 112, and the support section 121 extends straight along the inner peripheral wall of the lumen 112. At this time, the control section 122 can extend along the inner peripheral wall of the lumen 112, or extend close to the inner peripheral wall of the lumen 112. For example, the radial clearance between the control section 122 and the inner peripheral wall of the lumen 112 is 0.01-0.1 mm.

[0027] like Figure 5 As shown, when the distal end of the control section 122 is in the second position, the distal end of the control section 122 is located inside the lumen 112. The distal end of the control section 122 pushes the distal end of the support section 121 towards the proximal end of the support section 121 and towards the center of the lumen 112, causing the support section 121 to rotate about the fixed point at the proximal end as an axis, thereby causing the support section 121 to be in an arched shape towards the center of the lumen 112.

[0028] In some embodiments, the pipe wall of the pipe body 110 adopts a single-layer structure, and its material can be Pebax material.

[0029] In some embodiments, the pipe wall of the pipe body 110 adopts a composite layered structure.

[0030] In this embodiment, the cross-section of the support rod 120 can be set to a circle, or it can be set to a rectangle or other flat shapes.

[0031] The sheath 100 of this embodiment includes a tube body 110 and a support rod 120 that are movably disposed relative to each other. The support section 121 of the support rod 120 is movably disposed inside the cavity 112 of the tube body 110, and the control section 122 is movably disposed outside the cavity 112 of the tube body 110. The distal end of the control section 122 is connected to the distal end of the support section 121. Thus, when the user controls the proximal end of the control section 122, causing the control section 122 to move axially along the tube body 110, the length of the support rod 120 extending into the cavity 112 of the tube body 110 can be adjusted. Since the proximal end of the support section 121 is fixed to the pipe wall 111 of the pipe body 110, when the user controls the proximal end of the control section 122, causing the control section 122 to move distally along the axial direction of the pipe body 110, the length of the support rod 120 extending into the pipe cavity 112 will increase accordingly. The section of the support rod 120 located in the pipe cavity 112 will gradually expand radially, causing the support section 121 to bend towards the center of the pipe cavity 112, eventually becoming... Figure 4 and Figure 5 The arched, curved shape shown allows it to resemble... Figure 10As shown, the curved tube 411 of the endoscope insertion portion 410 located therein is clamped by the arched curved support section 121. After the tube body 110 connects the curved tube 411 of the endoscope insertion portion 410 to the tube wall 111 of the tube body 110 of the sheath 100 via the support section 121 of the support rod 120, the tube wall 111 can strengthen the rigidity and bending resistance of the clamped portion M of the curved tube 411, making the clamped portion M of the curved tube 411 more difficult to bend. This allows the distal end of the curved tube 411 located at the clamped portion M to bend more easily first, temporarily reducing the bending radius of the curved tube 411. This makes it easier for the insertion portion 410 to be positioned quickly and smoothly in narrow spaces such as the renal pelvis and reach the desired position.

[0032] When the tube body 110 clamps different axial parts of the curved tube 411 of the endoscope insertion part 410 through the support section 121 of the support rod 120, the bending radius of the curved tube 411 will change accordingly.

[0033] According to some optional embodiments, the wall 111 of the tube body 110 has a composite layered structure. For example... Figure 3 and Figure 5 As shown, the pipe body 110 includes an inner pipe, a spiral pipe, and an outer pipe sequentially arranged radially from the inside to the outside, and has good resistance to collapse. The inner pipe provides the inner pipe wall 111a of the pipe wall 111, the spiral pipe provides the spiral pipe wall 111b of the pipe wall 111, and the outer pipe provides the outer pipe wall 111c of the pipe wall 111.

[0034] The inner tube wall 111a and the outer tube wall 111c are made of Pebax material, which has good resilience and flexibility. The spiral tube wall 111b is made of 316L medical-grade stainless steel or titanium alloy.

[0035] In this embodiment, the proximal end of the support section 121 of the support rod 120 can be fixed to the inner tube wall 111a of the tube wall 111 with glue, or it can pass through the inner tube wall 111a and be fixed to the spiral tube wall 111b with glue or welding.

[0036] According to some optional embodiments, refer to Figures 2-6 The pipe body 110 is provided with at least two support rods 120 arranged sequentially along its circumference, and all support rods 120 are arranged at equal intervals along the circumference of the pipe body 110.

[0037] In some embodiments, two support rods 120 are provided, and the two support rods 120 are arranged opposite each other in the radial direction of the tube body 110. (See reference...) Figure 10 This allows the support sections 121 of the two support rods 120 to be in an arched, curved shape, which in turn clamps the curved tube 411 of the endoscope insertion part 410 located therebetween.

[0038] In some embodiments, three support rods 120 are provided, arranged sequentially at a 120° angle along the circumference of the tube body 110. (See reference) Figure 10 It can simultaneously position the support sections 121 of the three support rods 120 in an arched bending shape, thereby clamping the bent tube 411 of the endoscope insertion part 410 located therein in three directions.

[0039] In some embodiments, four support rods 120 are provided, arranged sequentially at a 90° angle along the circumference of the tube body 110. (See reference) Figure 10 It can simultaneously position the support sections 121 of the four support rods 120 in an arched bending shape, thereby clamping the bent tube 411 of the endoscope insertion part 410 located therein in four directions.

[0040] According to some optional embodiments, such as Figures 2-6 As shown, the cross-section of the support rod 120 is designed to be flat, such that the radial dimension of the cross-section of the support rod 120 in the tube body 110 is smaller than its circumferential dimension in the tube body 110. For example, the cross-sectional shape of the support rod 120 is rectangular. For example, the cross-sectional shape of the support rod 120 is an arc extending circumferentially along the tube wall 111 of the tube body 110.

[0041] According to some optional embodiments, the interior of the tube wall 111 is provided with a channel 1111 extending from the proximal end to the distal end, the proximal port of the channel 1111 being located on the proximal end face of the tube wall 111, and the distal port of the channel 1111 being located on the distal end face of the tube wall 111. An axially movable control section 122 is disposed within the channel 1111, and the distal end of the control section 122 extends from the distal port of the channel 1111 to connect to the distal end of the support section 121.

[0042] For example, the distal port of channel 1111 is located on the distal surface of tube wall 111. In this example case, the distal end of the control section 122 of support rod 120 extends axially from the distal port of channel 1111 to the distal side of tube body 110, then folds back proximally, and then enters tube lumen 112 from the distal port of lumen 112 and connects to the distal end of support section 121.

[0043] For example, such as Figures 2-5 As shown, the distal end of channel 1111 is located on the inner peripheral wall of pipe wall 111, that is, on the inner peripheral wall of lumen 112. In this example, as... Figure 3As shown, the distal end of the control section 122 of the support rod 120 extends radially into the lumen 112 before reaching the distal end face of the tube wall 111, connecting with the distal end of the support section 121. This allows the control section 122 of the support rod 120 to extend entirely inside the tube body 110, and the support section 121 to extend entirely inside the lumen 112 of the tube body 110, without any structure extending beyond the distal end of the lumen. This avoids damage to the mucosal tissue and provides higher safety in use.

[0044] In some embodiments, reference is made to Figure 5 and Figure 6 Channel 1111 is located between the spiral tube wall 111b and the outer tube wall 111c.

[0045] According to some optional embodiments, such as Figures 2-5 As shown, the interior of the pipe wall 111 has multiple channels 1111, and a support rod 120 is inserted through each channel 1111. The control section 122 of the support rod 120 is axially movable and inserted through the corresponding channel 1111.

[0046] In some embodiments, there are two support rods 120, and correspondingly, there are two channels 1111.

[0047] In some embodiments, three support rods 120 are provided, and correspondingly, three channels 1111 are provided.

[0048] In some embodiments, four support rods 120 are provided, and correspondingly, four channels 1111 are provided.

[0049] According to some optional embodiments, such as Figure 3 , Figure 5 and Figure 6 As shown, a conduit 113 is fixedly inserted into the channel 1111 provided in the tube wall 111 of the tube body 110. The control section 122 of the support rod 120 is axially movable and inserted into the tube hole of the conduit 113, and is circumferentially constrained by the tube hole of the conduit 113. The conduit 113 isolates the control section 122 of the support rod 120 from the spiral tube wall 111b in some embodiments through its peripheral wall, and provides a flat guide surface for the control section 122 of the support rod 120 through the tube hole, so as to avoid the control section 122 from contacting and getting stuck with the spiral tube wall 111b when it moves.

[0050] The catheter 113 extends from the proximal end of the wall 111 of the tube body 110 to the distal end of the wall 111. The distal end of the catheter 113 can extend to the distal port of the channel 1111, or it can extend to the proximal side of the distal port of the channel 1111.

[0051] In some embodiments, each channel 1111 is provided with a separate conduit 113, and each conduit 113 is provided with a corresponding control section 122 of a support rod 120 in its tube hole.

[0052] Secondly, embodiments of this application provide a guide sheath 300, which includes a sheath seat 200 and a sheath tube 100 as described in any of the above embodiments. The proximal end of the sheath tube 100, which passes through the tube wall 111 of the tube body 110, is fixed to the distal end of the sheath seat 200, and the proximal port of the lumen 112 of the tube body 110 communicates with the inner cavity of the sheath seat 200.

[0053] like Figure 1 , Figure 7 and Figure 8 As shown, the sheath 200 includes a housing 210 and a control member 220 that are movably connected. An inner cavity is formed inside the housing 210, and a [missing information - likely a device or component] is provided on the housing 210. Figure 8 The mounting hole 211 shown in the figure communicates the inner cavity of the housing 210 with the outside.

[0054] One end of the control element 220 is located on the outside of the housing 210 for the user to push with their finger; the other end of the control element 220 passes through the mounting hole 211 from the outside into the inner cavity of the housing 210 and is fixedly connected to the proximal end of the control section 122 of the support rod 120 of the sheath 100. The user can control the axial movement of the control section 122 relative to the tube body 110 by pushing the control element 220 relative to the housing 210, thereby allowing the support section 121 of the support rod 120 to move axially. Figure 3 The straight extension shape shown and Figure 5 The diagram shows the switching between arched, curved shapes.

[0055] In some embodiments, such as Figure 6 As shown, the control element 220 has a push button 221 at one end located outside the housing 210. The push button 221 provides a large contact surface, allowing the user's finger to easily press on the contact surface to push the push button 221. The other end of the control element 220 is configured as a connecting rod 222 that is slender compared to the push button 221. One end of the connecting rod 222 is fixedly connected to the push button 221, and the other end passes through the mounting hole 211 into the inner cavity of the housing 210, and is fixedly connected to the proximal end of the control section 122 of the support rod 120.

[0056] In some embodiments, such as Figure 8 As shown, the mounting hole 211 on the housing 210 is a rectangular hole or an oblong hole. The connecting rod 222 of the control member 220 passes through the mounting hole 211 and can move relative to the guide sheath 300 along its length relative to the mounting hole 211 towards the proximal or distal end, thereby driving the control section 122 of the support rod 120 to move relative to the tube body 110 towards the proximal or distal end.

[0057] According to some optional embodiments, such as Figure 1 , Figures 6-8 As shown, two control components 220 are mounted on the housing 210 of the sheath 200. The two control components 220 are arranged on the same side of the housing 210 and are arranged side by side along the circumference of the housing 210, so that the user can operate the two control components 220 simultaneously or separately with the fingertip or other parts of the finger.

[0058] There are four support rods 120 in total, arranged in two groups, with two support rods 120 in each group arranged radially opposite each other. The four support rods 120 are arranged sequentially along the circumference of the tube body 110 of the sheath tube 100, with adjacent support rods 120 forming a group. Figure 6 As shown, a control element 220 simultaneously fixes the proximal ends of the control sections 122 of two support rods 120 in a set. This allows the user to control two adjacent support rods 120 simultaneously by manipulating one control element 220. The curved tube 411 of the endoscope insertion part 410 can be clamped in four directions by the two sets of support rods 120; alternatively, one set of support rods 120, in cooperation with the tube wall 111 of the tube body 110, can clamp the curved tube 411 of the endoscope insertion part 410 in three directions. In this case, the curved tube 411 of the endoscope insertion part 410 will be pushed to one side by the set of support rods 120 and placed in an eccentric position.

[0059] In some embodiments, such as Figure 6 As shown, one end of the connecting rod 222 is provided with an arc-shaped section, through which the connecting rod 222 simultaneously connects to the proximal ends of the control sections 122 of two adjacent support rods 120 in the same group.

[0060] According to some optional embodiments, such as Figure 1 and Figure 8 As shown, the control element 220 is located at the far end of the housing 210.

[0061] Thirdly, some embodiments of this application provide an endoscope assembly, which includes an endoscope and the guide sheath 300 in any of the above embodiments. For example... Figure 10 As shown, the guide sheath 300 can clamp the curved tube 411 of the endoscope insertion part 410 through the support section 121 of the support rod 120, so that the curved tube 411 can... Figure 11 In the scenario shown, the bending tube 411 can be bent first at one end on the distal side of the clamped part M to reduce the bending radius of the bending tube 411.

[0062] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0063] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0064] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A sheath (100), characterized in that: include: The tube body (110) includes a tube wall (111) extending axially from the proximal end to the distal end and a cavity (112) circumferentially enclosed by the tube wall (111). The tube body (110) is provided with at least two support rods (120) arranged sequentially along its circumference, and all the support rods (120) are arranged at equal intervals along the circumference of the tube body (110); each support rod (120) includes a support section (121) movably disposed inside the tube cavity (112) and a control section (122) movably disposed outside the tube cavity (112), both the support section (121) and the control section (122) extending axially along the tube body (110); the distal end of the control section (122) extends radially and is fixedly connected to the distal end of the support section (121), and the proximal end of the support section (121) is fixedly connected to the tube wall (111); the control section (122) can be controllably moved axially relative to the tube body (110) so that the distal end of the control section (122) can be adjusted between a first position and a second position. When the distal end of the control segment (122) is located in the first position, the distal end of the control segment (122) is located outside the lumen (112), and the support segment (121) extends straight along the inner peripheral wall of the lumen (112). When the distal end of the control segment (122) is in the second position, the distal end of the control segment (122) is located inside the lumen (112), and the support segment (121) is arched toward the center of the lumen (112).

2. The sheath according to claim 1, characterized in that: The cross-section of the support rod (120) is circular, or the cross-section of the support rod (120) is flat, and the dimension of the cross-section of the support rod (120) in the radial direction of the tube body (110) is smaller than the dimension in the circumferential direction of the tube body (110).

3. A sheath according to claim 1 or 2, characterized in that: The tube wall (111) is provided with a channel (1111) extending from the proximal end to the distal end. The proximal port of the channel (1111) is located on the proximal end face of the tube wall (111), and the distal port of the channel (1111) is located on the inner peripheral wall or the distal end face of the tube wall (111). The control section (122) is axially movable and passes through the channel (1111). The distal end of the control section (122) extends out from the distal port of the channel (1111) to connect to the distal end of the support section (121).

4. A sheath according to claim 3, characterized in that: The interior of the pipe wall (111) is provided with a plurality of channels (1111), and a control section (122) is respectively inserted in one channel (1111).

5. A sheath according to claim 3, characterized in that: The tube wall (111) includes an inner tube wall (111a), a spiral tube wall (111b) and an outer tube wall (111c) stacked in a radial direction from the inside to the outside; the channel (1111) is disposed between the spiral tube wall (111b) and the outer tube wall (111c).

6. A sheath according to claim 3, characterized in that: A conduit (113) is fixedly inserted into the channel (1111), and the control section (122) is axially movable and inserted into the hole of the conduit (113), and is circumferentially constrained by the hole of the conduit (113).

7. A guiding sheath (300), characterized in that: It includes a sheath seat (200) and a sheath tube (100) as described in any one of claims 1-6, wherein the proximal end of the sheath tube (100) is fixed to the distal end of the sheath seat (200).

8. A guiding sheath according to claim 7, characterized in that: The sheath (200) includes a housing (210) and a control member (220) movably disposed in the housing (210). One end of the control member (220) is located outside the housing (210), and the other end is inserted into the inner cavity of the housing (210) and fixedly connected to the proximal end of the control section (122) of the support rod (120) of the sheath (100). The control section (122) can be axially moved relative to the tube body (110) by manipulating the control member (220).

9. A guiding sheath according to claim 8, characterized in that: The housing (210) is provided with two control members (220), which are arranged on the same side of the housing (210) and side by side along the circumference of the housing (210); The support rod (120) is provided with four rods arranged sequentially along the circumference of the tube body (110) of the sheath tube (100). Two adjacent support rods (120) form a group, and there are two groups in total. One of the control elements (220) simultaneously secures the proximal ends of the control segments (122) of two of the support rods (120) in a set; And / or, the control element (220) is located at the distal end of the housing (210).

10. An endoscope assembly, characterized in that: Includes an endoscope and a guide sheath (300) as described in claim 7, 8 or 9.

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