Guiding sheath capable of being bent and locked

Abstract

The invention provides a bendable locking guide sheath which comprises a sheath tube, a handle, a sliding part, a traction rope, a first locking mechanism and a second locking mechanism, the handle is arranged at the near end of the sheath tube, a sliding way is formed in the handle, and a plurality of tooth grooves are formed in the outer wall of the handle; the sliding piece is arranged on the handle in a sliding mode, the sliding piece is provided with a sliding block, and the sliding block penetrates through the sliding way and extends into the handle; the traction rope is connected between the sliding block and the far end of the sheathing canal; the first locking mechanism comprises a pressing piece and a first elastic piece, the pressing piece is rotationally arranged on the sliding piece, the pressing piece is provided with a locking end and a pressing end, and the locking end is selectively clamped into the tooth groove under the action of the first elastic piece; the second locking mechanism comprises a driving buckle and a driven buckle, the driving buckle is arranged on the pressing piece, and the driven buckle is arranged on the sliding piece; the second locking mechanism is configured in the mode that when the locking end is clamped into the tooth groove, the driving buckle and the driven buckle are clamped, and one-hand operation is achieved.

Description

Technical Field

[0001] This invention relates to the field of guide sheath technology, and more particularly to a bendable and lockable guide sheath. Background Technology

[0002] A guide sheath is a hollow, tubular medical device used to establish a stable and controllable access channel for interventional instruments such as catheters, guidewires, and stents. In cholangioscopy, to accommodate the tortuous anatomy of the biliary system, the distal end of the guide sheath must have controllable bending capabilities to guide the cholangioscope into the target area and allow for real-time observation of intraluminal images via an external display screen.

[0003] In existing technologies, bending and locking are often achieved using screws and traction ropes. Specifically, the traction rope is tightened or loosened by rotating the screw on the handle, thereby adjusting the bending angle at the distal end, and the angle is maintained by the friction of the threads.

[0004] However, both hands must be used in operation, that is, one hand holds the handle and the other hand rotates the screw. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a flexible, lockable guide sheath that enables one-handed operation.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A flexible, lockable guide sheath, comprising: Sheath; A handle is located at the proximal end of the sheath, the handle has a sliding track, and the outer wall of the handle has multiple toothed grooves; A slider is slidably disposed on the handle, the slider having a sliding block that passes through the slide rail and extends into the interior of the handle; A traction rope, which is connected between the sliding block and the distal end of the sheath; A first locking mechanism includes a pressing member and a first elastic member. The pressing member is rotatably mounted on the sliding member. The pressing member has a locking end and a pressing end. The locking end can be selectively engaged into the tooth groove under the action of the first elastic member. The second locking mechanism includes an active latch and a passive latch, wherein the active latch is disposed on the pressing member and the passive latch is disposed on the sliding member; The second locking mechanism is configured such that when the locking end engages with the tooth groove, the active latch and the driven latch engage.

[0007] In a preferred embodiment, the outer wall contour of the active buckle has an upper guide slope, a lower guide slope, and a slot located therebetween; The second locking mechanism further includes a second elastic element for driving the engaging portion of the driven latch into the slot.

[0008] In a preferred embodiment, the engaging portion of the buckle is triangular.

[0009] In a preferred embodiment, the sliding member is provided with a guide frame, and the driven buckle is slidably installed in the guide frame, with its sliding direction parallel to the axis of the slide rail.

[0010] In a preferred embodiment, the guide frame is provided with a limiting protrusion, and the driven buckle is provided with a limiting part. The limiting protrusion and the limiting part cooperate to prevent the driven buckle from falling out of the guide frame.

[0011] In a preferred embodiment, there are two driven latches, symmetrically arranged on both sides of the active latch.

[0012] In a preferred embodiment, the sliding member includes two sliding side plates and a sliding top plate connected to its top. The pressing member is rotatably disposed between the two sliding side plates, and an opening is provided on the sliding top plate for the pressing end to be exposed.

[0013] In a preferred embodiment, the slider further includes a support plate connected between the two sliding side plates, and the first elastic member is disposed between the support plate and the pressing end.

[0014] In a preferred embodiment, the outer wall of the sheath is provided with two rows of slots, the slide is located between the two rows of slots, the two rows of slots correspond one-to-one, and the locking end engages with the corresponding slot.

[0015] In a preferred embodiment, the outer wall of the handle is provided with at least one interface, which communicates with the proximal end of the sheath.

[0016] Compared with existing technologies, this technical solution has the following advantages: The sliding and pressing components are highly integrated into the sliding component and the first locking mechanism. The surgeon only needs to press down on the pressing end of the pressing component with the thumb of the same hand to simultaneously release the locking states of the first and second locking mechanisms; while maintaining pressure, the thumb can also push the entire sliding component along the track, thereby precisely controlling the bending of the distal end of the sheath via the traction cord. This greatly improves operational efficiency and flexibility, and is particularly suitable for complex surgical scenarios where the other hand needs to operate other instruments simultaneously.

[0017] The locking end of the pressing component engages with the toothed groove on the outer wall of the handle, providing a basic and rapid angular locking force. When the locking end engages with the toothed groove, the active latch and the driven latch automatically engage, realizing a dual locking mechanism. This ensures high stability in the bending state and significantly improves the reliability and safety of the locking state. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the bendable locking guide sheath described in this invention; Figure 2 This is a longitudinal sectional view of the bendable locking guide sheath described in this invention; Figure 3 This is a cross-sectional view of the bendable locking guide sheath described in this invention; Figure 4 This is a schematic diagram of the structure of the first locking mechanism of the present invention; Figure 5 This is a schematic diagram of the structure of the second locking mechanism of the present invention; Figure 6 This is a schematic diagram of the active buckle structure described in this invention.

[0019] In the diagram: 100 Sheath tube, 200 Handle, 210 Slide rail, 220 Gear groove, 230 Interface, 240 Limiting groove, 300 Sliding component, 310 Sliding block, 320 Sliding side plate, 330 Sliding top plate, 331 Sliding front top plate, 332 Sliding rear top plate, 340 Support plate, 341 Sleeve column, 350 Rotating shaft, 360 Rear sliding block, 400 Traction rope, 500 First locking mechanism, 510 Pressing component, 511 Locking end, 512 Pressing end, 51 2a Groove, 520 First Elastic Member, 600 Second Locking Mechanism, 610 Active Buckle, 611 Upper Guide Inclined Surface, 612 Lower Guide Inclined Surface, 613 Slot, 613a Upper Side of Slot, 613b Lower Side of Slot, 613c Bottom Surface of Slot, 620 Driven Buckle, 621 Engaging Part, 622 Limiting Part, 630 Second Elastic Member, 700 Guide Frame, 710 Upper Guide Plate, 720 Lower Guide Plate, 721 Limiting Protrusion, 730 Rear Guide Plate. Detailed Implementation

[0020] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0021] Please refer to Figure 1 , Figure 4 and Figure 5An embodiment of the present invention provides a bendable locking guide sheath, comprising: Sheath 100; The handle 200 is located at the proximal end of the sheath 100. The handle 200 has a slide 210 and a plurality of toothed grooves 220 on its outer wall. A slider 300 is slidably disposed on the handle 200. The slider 300 has a sliding block 310, which passes through the slide rail 210 and extends into the handle 200. A traction rope 400 is connected between the sliding block 310 and the distal end of the sheath 100; A first locking mechanism 500 includes a pressing member 510 and a first elastic member 520. The pressing member 510 is rotatably mounted on the sliding member 300. The pressing member 510 has a locking end 511 and a pressing end 512. The locking end 511 can be selectively engaged into the toothed groove 220 under the action of the first elastic member 520. The second locking mechanism 600 includes an active latch 610 and a passive latch 620. The active latch 610 is disposed on the pressing member 510, and the passive latch 620 is disposed on the sliding member 300. The second locking mechanism 600 is configured such that when the locking end 511 is engaged with the tooth groove 220, the active latch 610 engages with the driven latch 620.

[0022] Based on the above structure, during operation, the operator places their thumb on the pressing end 512 of the pressing member 510 and presses down, causing the pressing member 510 to rotate around its axis. The locking end 511 then lifts up, disengaging from the toothed groove 220, thus unlocking the first locking mechanism 500. Simultaneously, the active latch 610 separates from the driven latch 620, unlocking the second locking mechanism 600. At this point, the operator can push the sliding member 300 along the handle 200 axis. The sliding block 310 moves within the slide rail 210, causing the distal end of the sheath to bend via the traction rope 400. The slide rail 210 not only guides the sliding member but also restricts its movement trajectory, ensuring operational stability.

[0023] Once the distal end of the sheath is bent to the desired angle, the pressing end 512 is released. Under the restoring force of the first elastic element 520, the locking end 511 re-engages into the corresponding toothed groove 220. Simultaneously, the active latch 610 and the driven latch 620 engage again, achieving double locking. This structural design allows the operator to complete the bending and locking operations with one hand, improving operational efficiency.

[0024] It not only achieves the key one-handed operation function, improving the ease of operation, but also ensures high stability in the bending state through a dual locking mechanism, making it superior to traditional screw adjustment methods in terms of both operating efficiency and safety.

[0025] like Figure 1 As shown, the sheath 100 is a hollow tubular structure, and its lumen is used to deliver or accommodate other interventional instruments (such as catheters, guidewires, etc.). The sheath 100 adopts a segmented design in the axial direction, consisting of a soft segment at the distal end and a hard segment at the proximal end.

[0026] The soft segment is the functional part that enables controllable bending of the distal end of the sheath. It is made of highly flexible and elastic polymer materials (such as polyurethane, polyethylene, block polyamide or thermoplastic elastomer) to ensure smooth bending action and excellent biocompatibility.

[0027] The rigid section is connected to the handle 200 at its proximal end and to the soft section at its distal end, providing core structural support for the sheath body. This section uses engineering plastics (such as polyamide, polyimide, or polyetheretherketone) with superior rigidity and dimensional stability to give the sheath the necessary support, compression resistance, and torque transmission.

[0028] The soft and hard segments are connected through a molding and fusion process. Specifically, the hard segment material is heated under controlled conditions to fuse it with the end of the pre-made soft segment or to be encapsulated by secondary injection molding, thereby forming a strong, smooth and integrated transition zone.

[0029] like Figure 1 As shown, the handle 200 is fixedly connected to the proximal end of the sheath 100, forming the main operating body. The upper surface of the handle 200 is provided with a slide 210, a toothed groove 220, a sliding member 300, and a pressing member 510. The lower surface of the handle 200 is designed with an ergonomic arc contour for easy gripping.

[0030] During operation, the operator places their thumb naturally on the pressing element 510, while the other four fingers (index, middle, ring, and little fingers) are bent and rest against the lower surface of the handle 200, thus achieving a stable and comfortable grip. This design allows the operator to complete all operations with one hand: the thumb performs the pressing and unlocking action and pushes the slider 300, while the other fingers provide a stable grip and, through precise coordination, accurately control the bending and locking of the distal end of the sheath 100.

[0031] like Figure 1 and Figure 3As shown, the outer wall of the handle 200 is provided with at least one interface 230, which communicates with the inner cavity of the sheath 100 and is located near the proximal end of the sheath 100. The axial direction of the interface 230 is inclined relative to the axis of the handle 200.

[0032] The interface 230 serves as an insertion channel for interventional devices (such as catheters, guidewires, infusion tubes, etc.).

[0033] This interface 230 can serve as the main inlet channel for interventional instruments. The instrument is inserted through this interface, passes through the lumen of the sheath 100, and finally extends out from the distal end of the sheath.

[0034] The interface 230 can also be connected to an infusion line for flushing or drug administration. In this application scenario, an independent infusion channel can be pre-fabricated within the wall of the sheath 100. The proximal end of this infusion channel communicates with the interface 230, while the distal end has an infusion port on the outer wall of the distal end of the sheath 100. Liquid can be injected through the interface 230, pass through the internal infusion channel, and finally flow out from the distal infusion port, acting on the target site to achieve local perfusion or flushing without occupying the main lumen through which the device passes.

[0035] refer to Figure 1 The upper surface of the handle 200 is provided with a limiting groove 240 parallel to the handle axis. The bottom surface of the limiting groove 240 has a slide rail 210 for the sliding block 310 to pass through. The sliding member 300 is accommodated and confined within this limiting groove 240, so that the sliding member 300 can only slide along the length of the limiting groove. The length of the limiting groove 240 precisely defines the axial travel of the sliding member 300.

[0036] The sliding member 300 is slidably disposed on the bottom surface of the limiting groove 240. On the bottom surface, in addition to the slide 210, toothed grooves 220 are also machined at intervals along the length direction of the slide 210.

[0037] See Figure 1 and Figure 2 The toothed groove 220 is inclined relative to the bottom surface of the limiting groove 240. When the pressing member 510 is in its natural state under the elastic force of the first elastic member 520, its locking end 511 also presents a corresponding tilt angle. The inclined toothed groove 220 can form a better force-bearing surface contact with the inclined downward pressing locking end 511.

[0038] The spacing of the toothed grooves 220 serves to quantify the smooth sliding stroke into multiple locking positions. During operation, the operator can continuously push the slider 300 to the target locking position and then release it; the locking mechanism will automatically fix it in the corresponding locking position.

[0039] like Figure 1As shown, to significantly enhance locking stability, two rows of slots 220 are symmetrically arranged on the bottom surface of the limiting groove 240, and the slide rail 210 is located between these two rows of slots 220. These two rows of slots 220 are axially corresponding one-to-one. Correspondingly, the locking end 511 of the pressing member 510 can simultaneously engage with the two corresponding slots 220. This symmetrical locking design ensures that the locking force applied to the sliding member 300 remains balanced on both sides of the slide rail 210, effectively preventing the sliding member from deflecting or wobbling due to uneven force distribution in the locked state, thereby greatly improving the rigidity and reliability of the locking mechanism.

[0040] like Figure 1 and Figure 4 As shown, the sliding member 300 includes two sliding side plates 320 and a sliding top plate 330 connected to its top, and the pressing member 510 is rotatably disposed between the two sliding side plates 320.

[0041] At the bottom of the two sliding side plates 320, there is an integrally formed sliding block 310. The sliding block 310 is located between the two side plates and is inserted into the slide rail 210 on the handle 200. The sliding block 310 is used to connect the traction rope 400 to ensure the integrity and stability of the sliding member 300 structure.

[0042] The distal end of the traction rope 400 is fixedly connected to the soft section at the distal end of the sheath 100. The traction rope 400 can be directly pulled or released by moving the sliding member 300 along the axis of the handle 200, thereby controlling the shape of the distal end of the sheath. When the slider 300 moves backward (i.e. away from the sheath 100), the traction rope 400 is tightened, causing the soft section of the sheath 100 to bend.

[0043] When the slider 300 moves forward (i.e., towards the sheath 100), the traction rope 400 is released, and the soft section gradually straightens under its own elastic restoring force.

[0044] The arrangement of the traction rope 400 can be determined according to design requirements: firstly, it can be integrated inside the wall of the sheath 100, that is, it can be encased in a dedicated channel formed between the outer wall and the inner lining of the sheath; secondly, it can be attached to the outside of the sheath 100. The former provides smoother movement and protects the traction rope, while the latter simplifies the manufacturing process. Both methods ensure that the movement of the traction rope 400 does not interfere with interventional instruments passing through the interface 230 and the main lumen of the sheath.

[0045] refer to Figure 1 and Figure 4At the bottom of the two sliding side plates 320, closer to the end of the handle than the aforementioned sliding block 310, a rear sliding block 360 is also provided. The sliding block 360 is then inserted into the slide rail 210, working together with the sliding block 310 to ensure that the slider 300 moves smoothly and linearly along the slide rail 210 without wobbling. The bottom plane of the sliding side plate 320 slides in contact with the bottom surface of the limiting groove 240, providing auxiliary support.

[0046] The pressing member 510 is hinged to the sliding member 300 via a pivot 350. Specifically, the pivot 350 spans and is fixed between the two sliding side plates 320, and the middle part of the pressing member 510 is sleeved on the pivot 350, thereby realizing the function of rotating around the axis between the two sliding side plates 320.

[0047] like Figure 1 As shown, the sliding top plate 330 has a streamlined shape from front to back and can be roughly divided into a front sliding top plate 331 and a rear sliding top plate 332. The height of the front sliding top plate 331 gradually increases from front to back, and the height of the rear sliding top plate 332 gradually decreases from front to back. The connection between the front sliding top plate 331 and the rear sliding top plate 332 forms the highest point of the sliding top plate 330.

[0048] This streamlined profile provides the operator's thumb with an ergonomic and natural placement: the pad of the thumb can comfortably rest at the highest point. When it is necessary to push the slider 300, the thumb can press forward (towards the distal end of the sheath 100) against the downward-angled sliding rear plate 332, efficiently converting the pressing force into a forward thrust, making the operation very effortless.

[0049] Furthermore, to further enhance operational reliability, the upper surface of the sliding top plate 330 is provided with multiple anti-slip grooves. These anti-slip grooves extend in a direction perpendicular to the axial direction of the slider 300, effectively increasing the friction between the thumb and the top plate surface and preventing slippage during pressing or pushing.

[0050] like Figure 1 and Figure 4 As shown, the sliding top plate 330 has an opening 331 for exposing the pressing end 512. The opening 331 is located on the sliding rear top plate 332, near the connection between the sliding front top plate 331 and the sliding rear top plate 332. This integrated design allows the surgeon's single thumb to simultaneously cover and apply pressure to the pressing end 512 and the surrounding surface of the sliding top plate 330.

[0051] The sliding member 300 further includes a support plate 340 connected between the two sliding side plates 320. The support plate 340 is located below the pressing end 512, and the first elastic member 520 (such as a compression spring) is disposed between the support plate 340 and the pressing end 512. The bottom of the support plate 340 and the bottom of the sliding side plates 320 are slidably disposed with respect to the bottom surface of the limiting groove 240.

[0052] During operation, the operator presses down on the pressing end 512 with their thumb, causing it to move downward relative to the sliding top plate 330 through the opening 331. The first elastic element 520 is compressed, driving the pressing element 510 to rotate around the rotating shaft 350. The locking end 511 at the other end then lifts up, thereby disengaging from the toothed groove 220 of the handle 200, thus unlocking the first locking mechanism 500.

[0053] While maintaining the downward pressure, the operator can push the sliding top plate 330 forward (towards the distal end of the sheath) with their thumb. Since the pressing element 510 and the sliding element 300 are an integral structure, the entire sliding element 300 then slides forward along the slide rail 210, causing the distal end of the sheath 100 to begin to bend via the traction rope 400. After the thumb is released, the rebound force of the first elastic element 520 drives the locking end 511 to re-engage in the tooth groove, achieving automatic locking.

[0054] refer to Figure 4 The upper surface of the support plate 340 is provided with an upwardly protruding sleeve 341. The lower end of the first elastic element 520 is directly fitted onto this sleeve 341, thereby ensuring the stability of the bottom position of the spring during compression. Correspondingly, a groove 512a is machined on the lower surface of the pressing end 512. The position of the groove 512a is vertically opposite to the sleeve 341 on the support plate 340. After assembly, the upper end of the first elastic element 520 is precisely accommodated in this groove 512a. When the operator presses down on the pressing end 512, the first elastic element 520 is stably compressed in the space between the groove 512a and the sleeve 341.

[0055] Continue to refer to Figure 4 The rotatable connection between the pressing member 510 and the sliding member 300, as well as the locking end 511, are both located between the support plate 340 and the sliding block 310. The pressing end 512 is located above the support plate 340.

[0056] like Figure 5 As shown, the second locking mechanism 600 includes an active latch 610 and a passive latch 620. The active latch 610 is disposed on the pressing member 510 and close to the locking end 511 of the pressing member 510. The passive latch 620 is disposed on the sliding member 300.

[0057] When the locking end 511 is engaged with the toothed groove 220 under the action of the first elastic member 520, the active latch 610 moves down together with the end of the pressing member 510 and engages with the driven latch 620. This state constitutes a secondary locking, providing redundant locking protection for the system.

[0058] Conversely, when the pressing end 512 is pressed, causing the locking end 511 to lift up and the first locking mechanism to unlock, the active latch 610 also lifts up, thus separating from the driven latch 620, and the second locking mechanism unlocks simultaneously.

[0059] This design ensures that the first and second locking mechanisms always operate synchronously: when the main locking is activated, the auxiliary locking is activated immediately to jointly prevent the slider from moving accidentally; when the main locking is released, the auxiliary locking is also released at the same time, allowing the slider to slide freely.

[0060] like Figure 5 and Figure 6 As shown, the outer wall contour of the active buckle 610 has an upper guide slope 611, a lower guide slope 612 and a slot 613 located therebetween; The second locking mechanism 600 also includes a second elastic element 630 (such as a compression spring), which acts on the driven latch 620 to provide it with a preload force that always faces the driving latch 610. Under the action of this preload force, the engaging portion 621 at the front end of the driven latch 620 is continuously pressed against the driving latch 610.

[0061] When the active latch 610 moves downward with the locking end 511, the engaging portion 621 of the driven latch 620 first contacts the upper guide slope 611. Under the thrust of the second elastic member 630, the engaging portion 621 slides along the upper guide slope 611 until it slides into and locks into the slot 613, thus completing the secondary locking.

[0062] When the active latch 610 is raised along with the locking end 511, the slot 613 moves upward, generating a backward thrust on the engaging part 621. This thrust overcomes the elastic force of the second elastic member 630, forcing the driven latch 620 to retract, and the engaging part 621 disengages from the slot 613 and slides along the lower guide slope 612 until the active latch 610 is completely disengaged, and the second locking mechanism is unlocked.

[0063] refer to Figure 6 The slot 613 is U-shaped and has the following characteristics: Card slot bottom surface 613c; The upper side surface 613a of the card slot is connected between the bottom surface 613c of the card slot and the upper guide slope 611; The lower side surface 613b of the card slot is connected between the bottom surface 613c of the card slot and the lower guide slope 612.

[0064] Correspondingly, the engaging portion 621 at the front end of the driven latch 620 is constructed as a right-angled triangle. When the active latch 610 and the driven latch 620 are fully engaged (i.e., locked by the second locking mechanism), the engaging portion 621 is accommodated within the latch groove 613 and located between the upper side surface 613a and the lower side surface 613b of the latch groove. At this time, the right-angled side of the engaging portion 621 is in close contact with the upper side surface 613a of the latch groove.

[0065] Furthermore, the distance from the upper guide slope 611 to the central axis of the active latch 610 gradually increases from top to bottom, while the distance from the lower guide slope 612 to the central axis gradually decreases from top to bottom. This profile ensures that the engaging portion 621 can slide smoothly along the slope during locking and unlocking.

[0066] Continue to refer to Figure 6 The width of the lower side 613b of the slot is greater than the width of the upper side 613a of the slot. The wider lower side 613b forms a transition platform with sufficient area at its connection with the lower guide slope 612. When the active latch 610 moves upward (i.e., when the unlocking process begins), the sufficient contact area provided by this platform can effectively convert the upward movement of the active latch 610 into a stable thrust on the engaging part 621, thereby smoothly overcoming the elastic force of the second elastic element 630, forcing the driven latch 620 to move outward, guiding the engaging part 621 to smoothly exit from the slot 613, and slide along the lower guide slope 612, ultimately completing the unlocking.

[0067] like Figure 5 As shown, the sliding member 300 is provided with a guide frame 700, and the driven buckle 620 is slidably installed in the guide frame 700, with its sliding direction parallel to the axis of the slide rail 210. This ensures that no matter whether the active buckle 610 is tilted up or down with the locking end 511 of the pressing member 510, the engaging part 621 of the driven buckle 620 can always be aligned with it at the correct angle and position, thereby achieving reliable engagement and disengagement of the second locking mechanism 600.

[0068] Specifically, the guide frame 700 includes: Upper guide plate 710; The lower guide plate 720, wherein the driven buckle 620 is slidably disposed between the upper guide plate 710 and the lower guide plate 720; A rear guide plate 730 is located on the side of the driven latch 620 away from the active latch 610, and a second elastic member 630 is provided between the driven latch 620 and the rear guide plate 730.

[0069] refer to Figure 5The lower guide plate 720 is provided with a limiting protrusion 721, and the driven buckle 620 is provided with a limiting part 622. The limiting protrusion 721 and the limiting part 622 cooperate to prevent the driven buckle 620 from coming out of the guide frame 700.

[0070] like Figure 5 As shown, to further enhance the stability of the second locking mechanism 600, two driven latches 620 are provided and symmetrically arranged on both sides of the active latch 610. This design ensures that the locking force is evenly distributed on both sides of the centerline of the active latch 610, effectively preventing off-center loading or jamming that may occur with unilateral locking, and ensuring a smoother and more reliable locking action.

[0071] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The scope of patent application of the present invention should not be limited by these embodiments. That is, any equivalent changes or modifications made in accordance with the spirit disclosed in the present invention still fall within the patent scope of the present invention.

Claims

1. A flexible, lockable guide sheath, characterized in that, include: Sheath (100); The handle (200) is located at the proximal end of the sheath (100), the handle (200) has a slide (210), and the outer wall of the handle (200) has multiple toothed grooves (220). A slider (300) is slidably disposed on the handle (200). The slider (300) has a sliding block (310) that passes through the slide rail (210) and extends into the handle (200). A traction rope (400) is connected between the sliding block (310) and the distal end of the sheath (100); A first locking mechanism (500) includes a pressing member (510) and a first elastic member (520). The pressing member (510) is rotatably mounted on the sliding member (300). The pressing member (510) has a locking end (511) and a pressing end (512). The locking end (511) can be selectively engaged in the toothed groove (220) under the action of the first elastic member (520). The second locking mechanism (600) includes an active latch (610) and a passive latch (620). The active latch (610) is disposed on the pressing member (510), and the passive latch (620) is disposed on the sliding member (300). The second locking mechanism (600) is configured such that when the locking end (511) engages with the toothed groove (220), the active latch (610) engages with the driven latch (620); The sliding top plate (330) of the sliding member (300) includes a front sliding top plate (331) and a rear sliding top plate (332). The height of the front sliding top plate (331) gradually increases from front to back, and the height of the rear sliding top plate (332) gradually decreases from front to back. The rear sliding top plate (332) has an opening (331) for the pressing end (512) to be exposed.

2. The flexible locking guide sheath as described in claim 1, characterized in that, The outer wall contour of the active buckle (610) has an upper guide slope (611), a lower guide slope (612) and a slot (613) located therebetween. The second locking mechanism (600) further includes a second elastic element (630) for driving the engaging portion (621) of the driven latch (620) into the slot (613).

3. The flexible locking guide sheath as described in claim 2, characterized in that, The engaging portion (621) of the buckle (620) is triangular.

4. The flexible locking guide sheath as described in claim 1, characterized in that, The sliding member (300) is provided with a guide frame (700), and the driven buckle (620) is slidably installed in the guide frame (700), with its sliding direction parallel to the axis of the slide rail (210).

5. The flexible locking guide sheath as described in claim 4, characterized in that, The guide frame (700) is provided with a limiting protrusion (721), and the driven buckle (620) is provided with a limiting part (622). The limiting protrusion (721) and the limiting part (622) cooperate to prevent the driven buckle (620) from coming out of the guide frame (700).

6. The flexible locking guide sheath as claimed in claim 1, characterized in that, The number of driven latches (620) is two, symmetrically arranged on both sides of the active latch (610).

7. The flexible locking guide sheath as claimed in claim 1, characterized in that, The sliding member (300) includes two sliding side plates (320) and a sliding top plate (330) connected to its top, and the pressing member (510) is rotatably disposed between the two sliding side plates (320).

8. The flexible locking guide sheath as claimed in claim 7, characterized in that, The sliding member (300) further includes a support plate (340) connected between the two sliding side plates (320), and the first elastic member (520) is disposed between the support plate (340) and the pressing end (512).

9. The flexible locking guide sheath as claimed in claim 1, characterized in that, The outer wall of the sheath (100) is provided with two rows of slots (220), and the slide (210) is located between the two rows of slots (220). The two rows of slots (220) correspond one to one, and the locking end (511) engages with the corresponding slots (220).

10. The flexible locking guide sheath as claimed in claim 1, characterized in that, The handle (200) has at least one interface (230) on its outer wall, which communicates with the proximal end of the sheath (100).

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