conveyor

Abstract

The present application provides a kind of conveyor, by setting at least circumferential non-rotatable locking assembly of screw rod, locking assembly is used to establish locking connection with movable handle, so that locking assembly is connected with the tooth block structure set by movable handle, the movement of movable handle in axial and circumferential is limited, ensure that movable handle can be locked and fixed by locking assembly when it moves to the complete release of bracket from sheath, in any position of screw rod, it is convenient for operator to hold movable handle to carry out subsequent surgical operation without making sheath continue to move in body and produce adverse effects.

Description

Technical Field

[0001] This invention relates to the field of interventional medical device technology, and more particularly to a delivery device. Background Technology

[0002] Aortic diseases such as aortic aneurysms and aortic dissections are among the most deadly and difficult-to-treat vascular surgical conditions. Traditional treatments involve surgery, which carries risks of significant trauma and high mortality. In recent years, a minimally invasive and simple interventional procedure has been developed, in which a covered stent is implanted at the site of the diseased blood vessel. The covered stent adheres tightly to the inner wall of the vessel, isolating the diseased area from blood flow. The covered stent allows normal blood flow while protecting the diseased vessel, effectively repairing vascular lesions. Currently, most delivery devices on the market consist of a combination of a fixed handle and a movable handle. Furthermore, during stent release, these devices are prone to stent stacking or twisting, which can negatively impact the accuracy of stent release and, in severe cases, lead to surgical failure.

[0003] Most delivery devices on the market today consist of a combination of a fixed handle and a movable handle. After the stent is released from the sheath, a further post-deployment procedure is usually required to fully deploy the stent into the blood vessel. However, during the proximal post-deployment of the stent, the doctor typically performs the post-deployment with one hand while using the other hand to grip the handle for leverage. In this process, the fixed handle is usually located at the front of the delivery device, while the post-deployment mechanism is located at the rear. Furthermore, the delivery device is generally quite long, making it difficult for the doctor to use the fixed handle for leverage, thus hindering the operation. Secondly, if the doctor grips the movable handle, the sheath may continue to move within the body, which is not conducive to the post-deployment of the stent and may also cause accidental stent displacement, resulting in inaccurate deployment. Summary of the Invention

[0004] Based on this, the present invention proposes a conveyor to at least solve the problem that the sheath continues to move due to accidental operation of the movable handle after the support is released.

[0005] To achieve this objective, the present invention adopts the following technical solution: a conveyor, comprising a sheath core assembly and a conveying handle, wherein the sheath core assembly comprises a sheath tube and a sheath tube connector connected to the proximal end of the sheath tube, the conveying handle comprises a fixed handle and a movable handle, a screw is connected to the proximal end of the fixed handle, the movable handle is sleeved on the screw, the sheath tube connector is disposed inside the screw and extends through the side wall of the screw and is connected to the movable handle; the movable handle includes an active state of rotating or dragging relative to the screw to adjust the axial position, and the conveying handle further includes a locking component, the locking component being used to establish a locking connection with the movable handle, and restricting the active state of the movable handle after connection.

[0006] In one embodiment, the movable handle includes a housing, a toothed block, and a switching device connected to the toothed block. The screw has axially extending slots on its opposite side walls. The sheath connector extends radially from the slots on both sides. The switching device controls the toothed block to switch between engaging and disengaging with the outer wall of the screw.

[0007] In one embodiment, the locking assembly includes a mounting portion coaxially disposed with the screw, the mounting portion being fixed relative to the screw at least in the circumferential direction; the mounting portion is provided with a first limiting member, and the housing is provided with a second limiting member at one end axially opposite to the mounting portion, the first limiting member and the second limiting member being fixedly connected when they are in the same axial position.

[0008] In one embodiment, the mounting part is slidably sleeved on the screw, and the inner wall of the mounting part is provided with at least two circumferential limiting blocks, which respectively pass through the spacer groove and extend into the inner cavity of the screw.

[0009] In one embodiment, the first limiting member is disposed at the end of the mounting portion opposite to the housing, and the first limiting member includes a plurality of first slots arranged circumferentially; the outer side wall of the housing near the mounting portion is provided with a sliding groove, the sliding groove having an axial length; the second limiting member includes a slider, the slider having a locking block extending toward the housing, the slider being disposed in the sliding groove and being able to slide axially along the sliding groove; when the slider slides to the side near the mounting portion, the locking block engages in any one of the first slots.

[0010] In one embodiment, the second limiting member has a plurality of locking holes along the circumferential direction of the outer side wall of the housing near the mounting part, and the mounting part is provided with the first limiting member near the outer side wall of the housing. The first limiting member includes an insertion part and a movable part. One end of the movable part is movably connected to the mounting part, and the other end is connected to the insertion part. The movable part can control the insertion part to move closer to or away from the housing. When the insertion part is close to the housing, the insertion part is inserted into any one of the locking holes.

[0011] In one embodiment, one end of the housing with the second limiting member in the axial direction is rotatably connected to the mounting portion in the circumferential direction.

[0012] In one embodiment, the second limiting member has a plurality of second slots circumferentially formed along the end of the housing near the mounting part, and the first limiting member has a locking post on the outer side wall of the mounting part. When the mounting part and the second slots are in the same axial position, the locking post is inserted into any one of the second slots.

[0013] In one embodiment, the outer wall of the mounting portion is provided with a plurality of elastic claws, each elastic claw including an extension extending in a direction parallel to the longitudinal axis of the housing, and a limiting block is provided at the distal end of the extension. The limiting block retracts toward the screw and engages with the screw when the elastic claw is not subjected to external force.

[0014] In one embodiment, the proximal end of the screw is connected to a rear release assembly, and the sheath core assembly further includes an inner sheath core passing through the sheath tube. The rear release assembly includes a clamping part and a screw cap. A gripper is inserted into the clamping part, and its outer wall is threadedly engaged with the inner wall of the screw cap. The screw cap has an inwardly protruding pressing part. The inner sheath core passes through the clamping part, the screw cap, and the gripper simultaneously. The pressing part moves axially with the rotation of the screw cap to press or move away from the gripper, so that the gripper clamps or releases the inner sheath core.

[0015] In one embodiment, the inner cavity of the clamping part is provided with a insertion groove having a non-circular radial cross section, and the insertion part of the gripper that is inserted into the insertion groove has the same non-circular radial cross section.

[0016] The advantage of this invention lies in that, compared to the prior art, this invention provides a delivery device that, by setting a locking component that is at least circumferentially non-rotatable relative to the screw, establishes a locking connection with the movable handle. This allows the locking component, after connection, to work in conjunction with the toothed structure of the movable handle to restrict the movement of the movable handle in both the axial and circumferential directions. This ensures that the movable handle, after the support has been fully released from the sheath, can be locked and fixed by the locking component at any position on the screw. This facilitates the operator's gripping of the movable handle for subsequent surgical procedures without causing adverse effects from continued movement of the sheath within the body. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the conveyor in Embodiment 1 of the present invention;

[0018] Figure 2 This is a schematic diagram of the conveying handle structure in Embodiment 1 of the present invention;

[0019] Figure 3 This is an exploded view of the conveying handle in Embodiment 1 of the present invention;

[0020] Figure 4 This is a schematic diagram of the tooth block structure in Embodiment 1 of the present invention;

[0021] Figure 5 This is a schematic diagram of the post-release component structure in Embodiment 1 of the present invention;

[0022] Figure 6 This is a schematic diagram of the locking component structure in Embodiment 1 of the present invention;

[0023] Figure 7 This is an exploded view of the locking component in Embodiment 1 of the present invention;

[0024] Figure 8 This is a schematic diagram of the gripper structure in Embodiment 1 of the present invention;

[0025] Figure 9 This is a schematic diagram of the screw cap structure in Embodiment 1 of the present invention;

[0026] Figure 10 This is a schematic diagram of the structure of the first limiting member and the clamping part in Embodiment 1 of the present invention.

[0027] Figure 11 This is a schematic diagram of the locking component in the conveyor in Embodiment 2 of the present invention;

[0028] Figure 12 This is a schematic diagram of the locking component in the upper housing in Embodiment 2 of the present invention;

[0029] Figure 13 This is a schematic diagram of the upper shell structure in Embodiment 2 of the present invention;

[0030] Figure 14 This is a schematic diagram of the structure of the first limiting member of the locking component in Embodiment 2 of the present invention;

[0031] Figure 15 This is a schematic diagram of the structure of the second limiting member in Embodiment 2 of the present invention;

[0032] Figure 16 This is a schematic diagram of the locking component in the upper housing in Embodiment 3 of the present invention;

[0033] Figure 17 This is a schematic diagram of the upper shell structure in Embodiment 3 of the present invention;

[0034] Figure 18 This is a schematic diagram of the locking component mounting part in Embodiment 3 of the present invention;

[0035] Figure 19 This is a schematic diagram of the structure of the first limiting member of the locking component in Embodiment 2 of the present invention;

[0036] Figure 20 This is a schematic diagram of the locking component in the conveyor in Embodiment 4 of the present invention;

[0037] Figure 21 This is a schematic diagram of the structure of the second limiting member in the outer shell in Embodiment 4 of the present invention;

[0038] Figure 22 This is a schematic diagram of the structure of the first limiting member of the locking component in Embodiment 4 of the present invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, exemplary embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this disclosure and to fully convey the scope of this disclosure to those skilled in the art.

[0040] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0041] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0042] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0043] It should also be noted that in the field of interventional medical devices, the proximal end refers to the end closer to the operator, while the distal end refers to the end farther from the operator; the direction of the rotational axis of an object such as a cylinder or tube is defined as the axial direction; the circumferential direction is the direction around the axis of the object (perpendicular to the axis and also perpendicular to the cross-sectional radius); the radial direction refers to the direction along the diameter or radius. It is important to note that the term "end" appearing in terms such as "proximal end," "distal end," "one end," "the other end," "first end," "second end," "initial end," "end point," "both ends," "free end," "upper end," and "lower end" is not limited to the tip, end point, or end face, but also includes a portion extending axially and / or radially from the tip, end point, or end face on the element to which the tip, end point, or end face belongs. The above definitions are for convenience only and should not be construed as limiting the invention.

[0044] Example 1

[0045] Please see Figures 1-2The delivery device 100 provided in this application is used to load a stent, which can be a lumen device, such as a lumen stent. The following description uses a lumen stent as an example. The stent includes a supporting frame and a membrane covering the supporting frame. The membrane covers the supporting frame to form a lumen structure. A bare wave loop is provided at the distal end of the supporting skeleton for hooking and positioning; the delivery device 100 includes a delivery handle 2, a sheath core assembly 1, and a post-release assembly 3. The delivery handle 2 includes a fixed handle 21 and a movable handle 22. The fixed handle 21 is connected to a screw 23, and the movable handle 22 is sleeved on the screw 23 and can slide axially or rotate circumferentially relative to the screw 23 to achieve axial movement; the sheath core assembly 1 includes a sheath tube and a sheath tube connector 225 connected to the proximal end of the sheath tube. The sheath tube is movably connected to the movable handle 22 through the sheath tube connector 225, and the movable handle 22 controls the sheath tube to slide axially; the sheath tube is used to accommodate a stent in a compressed state. When the sheath tube slides axially towards the proximal end, the stent is dislodged from the distal end of the sheath tube and released. After release, the stent self-expands and anchors to the vessel wall to achieve partial release; the sheath tube passes through the distal end of the delivery handle 2. The inner cavity is connected to the movable handle 22; the rear release assembly 3 is fixedly connected to the proximal end of the screw 23 of the conveying handle 2. The sheath core assembly 1 also includes an inner sheath core 11, which can be movably inserted into the sheath tube after connection; the side wall of the inner sheath core 11 near the distal end is provided with an anchoring element for anchoring the bracket. The anchoring element has multiple hook structures for hooking the bracket, and the distal end of the inner sheath core 11 is connected to a guide head, and the proximal end of the inner sheath core 11 is connected to an outer connector 12; the rear release assembly 3 is used to control the inner sheath core 11 to switch between a locked state and an axially sliding unlocked state. When the rear release assembly 3 of the conveyor 100 is in the unlocked state, the inner sheath core 11 can slide relative to the sheath tube towards the proximal end, thereby causing the anchoring element to slide a certain distance towards the proximal end, thereby releasing the part of the bracket hooked on the anchoring element and realizing the complete release of the bracket.

[0046] Please continue reading for more details. Figure 3 and Figure 4The movable handle 22 includes a housing, a toothed block 221, and a switching device 224 connected to the toothed block 221. For ease of assembly and disassembly, the housings are all of an upper and lower mating structure. The movable handle 22 includes a mating upper housing 222 and a lower housing 223. The screw 23 passes through the fixed handle 21 and the movable handle 22. The toothed block 221 and the sheath connector 225 are located inside the movable handle 22. The screw 23 includes an upper screw 231 and a lower screw 232 arranged radially. Both sides of the upper screw 231 and the lower screw 232 are provided with axially extending slots 233, so that the mating screw 23 has two symmetrically arranged slots 233. The proximal end of the sheath extends into the screw 23 of the conveying handle 2, and the two sides of the sheath connector 225 extend radially from the slots 233 on both sides. The sheath connector 225 is fixed relative to the sheath and can move axially along the slots 233. The sheath moves with the sheath connector 225. Axial movement is possible; three tooth blocks 221 are provided, spaced apart along the circumferential direction of the screw 23. A switching device 224 controls the switching of the tooth blocks 221 between engagement and disengagement with the outer wall of the screw 23. The switching device 224 maintains the tooth blocks 221 in an engaged first state under non-external force and disengages them under external force. In the first state, the movable handle 22 can be adjusted axially on the screw 23 by rotating along it. In the second state, the movable handle 22 can be adjusted axially on the screw 23 by dragging. To limit the movement of the movable handle 22, please refer to [reference needed]. Figure 6 The delivery handle 2 also includes a locking component 4, which is used to establish a locking connection with the movable handle 22. The locking connection enables the locking component 4 to form a locking structure on the movable handle 22, thereby restricting the movement state of the movable handle 22.

[0047] For further details, please refer to Figure 6 and Figure 7The locking assembly 4 includes a mounting portion 41 coaxially arranged with the screw 23. The mounting portion 41 is used to sleeve or fix onto the screw 23, and the mounting portion 41 is fixed relative to the screw 23 at least in the circumferential direction. It is understood that the mounting portion 41 itself is non-rotatable in the circumferential direction, so that after establishing a locking connection with the movable handle 22, it can restrict the circumferential rotation of the movable handle 22. Preferably, the mounting portion 41 is provided with a first limiting member 42, and the end of the housing opposite to the mounting portion 41 in the axial direction is provided with a second limiting member 226. The first limiting member 42 and the second limiting member 226 can be fixedly connected when they are in the same axial position. The mounting part 41 and the second limiting member 226 of the housing of the movable handle 22 should be located on the same side. When the second limiting member 226 is located on the far end side of the housing, the mounting part 41 is located on the far end side of the screw 23; when the second limiting member 226 is located on the near end side of the housing, the mounting part 41 is located on the near end side of the screw 23. The first limiting member 42 and the second limiting member 226 are two adaptable and connectable structures, such as insertion connection, snap-fit ​​connection, etc. After connection, the mounting part 41 and the movable handle 22 form a whole, so that the circumferential rotation and axial movement of the mounting part 41 and the circumferential rotation and axial movement of the movable handle 22 affect each other.

[0048] In this embodiment, please refer to Figure 5 The rear release assembly 3 is connected to the proximal end of the screw 23. The rear release assembly 3 includes a clamping part 31 and a cap 33. The clamping part 31 has a cylindrical structure, with an inner cavity provided with an insertion groove 311 having a non-circular radial cross-section, and an outer wall provided with external threads; please refer to Figure 8 and Figure 10 The gripper 32 is inserted into the insertion groove 311 of the clamping part 31. The insertion portion 321 of the gripper 32 and the insertion groove 311 has the same non-circular radial cross section. Here, the non-circular radial cross section of the gripper 32 insertion portion 321 prevents the inner sheath core 11 from rotating after being gripped by the gripper 32, thus achieving a circumferential limiting effect. The distal end of the inner sheath core 11 is used to anchor the bracket. This arrangement effectively prevents the rotation of the cap 33 during release from causing the inner sheath core 11 to rotate, thereby preventing the bracket from twisting or shifting. The outer wall of the clamping part 31 is threadedly engaged with the inner wall of the cap 33. Please refer to [link to relevant documentation]. Figure 9The cap 33 has an inwardly protruding pressing part 331. The top of the protruding part 331 is a flared opening, which makes it easier to receive and cover the clamping end 322 of the gripper 32. The flared, tapering structure can continuously increase the clamping force on the gripper 32 as the pressing part 331 moves toward the gripper 32. The inner sheath core 11 passes through the clamping part 31, the cap 33, and the gripper 32. The pressing part 331 moves axially with the rotation of the cap 33 to press or move away from the gripper 32, thus improving gripping force. The device 32 clamps or releases the inner sheath core 11; the cap 33 and the clamping part 31 form a screw-and-release structure, which can provide unlimited stroke release, while improving the efficiency of release and shortening the operation time; furthermore, the locking component 4 limits the movable handle 22 in the circumferential and axial directions, so that the operator can hold it at any position of the delivery device 100 to perform the release operation, without the problem of being unable to rotate the cap 33 while holding the movable handle 22, or the problem of the sheath sliding randomly due to accidental contact with the movable handle 22.

[0049] Please refer to further reading. Figure 14 , Figure 18 and Figure 22 To ensure that the mounting part 41 is fixed relative to the screw 23 at least circumferentially and cannot rotate circumferentially relative to the screw 23, the mounting part 41 is fitted onto the inner wall of the screw 23 and is provided with at least two circumferential limiting blocks 44. The circumferential limiting blocks 44 pass through the spacer groove 233 from the outside of the screw 23 and extend into the inner cavity of the screw 23. The thickness of the circumferential limiting blocks 44 is similar to or the same as the width of the spacer groove 233. This ensures that when the mounting part 41 wants to rotate, it is restricted by the upper screw 231 and the lower screw 232 of the screw 23, thus preventing circumferential rotation. Therefore, when the mounting part 41 is connected to the movable handle 22... When a locking connection is established, the movable handle 22 is restricted by the mounting part 41 and cannot rotate circumferentially. Thus, the switching device 224 of the movable handle 22 is not subject to external force, and the circumferential rotation of the movable handle 22 is restricted, allowing the movable handle 22 to be fixed in any position after stopping at any position of the screw 23 by establishing a locking connection with the mounting part 41. When medical personnel hold the movable handle 22 to perform other release operations, such as the post-release operation of the stent, the movable handle 22 remains stationary, thereby preventing the sheath from continuing to move in the body and ensuring the stability and safety of subsequent operations.

[0050] In this embodiment, please refer to Figure 7 and Figure 10The locking component 4 can be fixedly connected to the proximal end of the screw 23 and is detachably connected to the screw 23 through the mounting part 41. The first limiting member 42 is provided on the outer side wall of the mounting part 41 and includes a plurality of first baffles 421 protruding in the circumferential direction. The plurality of first baffles 421 are spaced apart and a slot 422 is formed between adjacent first baffles 421. The outer diameter of the mounting part 41 is the same as the outer diameter of the screw 23 and is coaxially arranged. When the housing of the movable handle 22 slides axially to the position of the mounting part 41, at least the proximal side of the housing is in the same axial position as the mounting part 41 and covers the surface of the mounting part 41. An insertion block is provided on the proximal inner wall of the outer casing, wherein the thickness of the insertion block is less than or equal to the width of the slot 422. Thus, when the proximal side of the outer casing and the mounting part 41 are in the same axial position, the insertion block can be inserted into any slot 422. The adjacent first baffle 421 restricts the circumferential rotation of the outer casing, thereby restricting the circumferential rotation of the movable handle 22. At this time, when the toothed block 221 and the screw 23 are engaged, the movable handle 22 cannot move axially or circumferentially, forming a fixed structure. Even if medical personnel hold the movable handle 22 to perform subsequent surgical operations, it will not affect the sheath inside the body. Preferably, a blocking member can be provided on the proximal side of the slot 422 to prevent the insertion block from being over-inserted and sliding out of the slot 422.

[0051] Example 2

[0052] Please see Figures 11-15 In this embodiment, the sheath core assembly 1 and conveying handle 2 of the conveyor 100 are largely the same as in embodiment 1. The difference is that the locking assembly 4 is sleeved on the outside of the screw 23. The first limiting member 42 of the mounting part 41 is located at the end of the mounting part 41 opposite to the housing, and the outer diameter of at least the end of the mounting part 41 opposite to the housing is less than or equal to the inner diameter of the housing. With this configuration, the first limiting member 42 at the end of the mounting part 41 can extend into one end of the housing. The first limiting member 42 includes a plurality of first slots 423 arranged circumferentially. The first slots 423 can be formed by the gap between two adjacent second baffles 424 after a plurality of second baffles 424 are spaced circumferentially on the end of the mounting part 41, or by a plurality of recessed grooves formed by cutting the end of the mounting part 41 axially. Please refer to Figure 13 and Figure 15A groove 228 is provided on the outer side wall of the housing near the mounting part 41. The groove 228 has an axial length. The second limiting member 226 includes a slider 2263. The slider 2263 is provided with a locking block 2262 extending into the housing and a buckle 2261 extending into the inner cavity of the housing. The buckle 2261 can lock the slider 2263 on the groove 228 and allow it to slide without coming out of the groove 228. The slider 2263 can slide axially along the groove 228. When the slider 2263 slides to the side near the mounting part 41, the locking block 2262 slides to the position of the first slot 423 and the locking block 2262 is engaged in any one of the first slots 423, realizing the circumferential limitation of the slot on the locking block 2262, thereby restricting the circumferential rotation of the housing. At this time, when the tooth block 221 and the screw 23 are in a meshing state, the movable handle 22 cannot move in the axial and circumferential directions, forming a fixed structure.

[0053] For the best options, please continue reading. Figure 14 In order to improve the accessibility of the card block 2262 when it mates with the first card slot 423, the edge of the second baffle 424 and / or the card block 2262 has an arc transition or rounded corner so that it can slide into the first card slot 423 by means of the arc transition or rounded corner when the alignment is not accurate. The arc transition or rounded corner of the second baffle 424 can be provided only at the outward protruding top corner position, and not at other positions. This can at least ensure good accessibility when the card block 2262 enters.

[0054] In this embodiment, please refer to Figure 12 and Figure 14The mounting part 41 can be set independently of the housing and can slide axially along the screw 23. When the movable handle 22 controls the sheath to retract and the bracket to disengage from the sheath, the mounting part 41 slides to the position of the movable handle 22 and establishes a locking connection with the movable handle 22, thereby restricting the movement of the movable handle 22. In a preferred embodiment, the end of the mounting part 41 opposite to the housing is provided with a T-shaped boss structure 45, and the cross-section of the T-shaped boss structure 45 in the axial direction has a T-shaped cross-section. The maximum outer diameter of the T-shaped boss structure 45 is less than or equal to the inner diameter of the housing, so that it can be inserted into the housing. A follower groove 43 is formed between the T-shaped boss structure 45 and the end of the mounting part 41. A follower plate 227 extends axially from the end of the housing opposite to the mounting part 41. The follower plate 227 is engaged in the follower groove 43, so that the mounting part is fixed relative to the movable handle 22 in the axial direction, but can rotate relative to it in the circumferential direction. When the movable handle 22 is not locked to the mounting part 41, it can slide axially or rotate circumferentially with the mounting part 41. The mounting part 41 of the follower structure has better integration with the movable handle 22. Compared with the independent setting, it can reduce the complexity of the doctor when operating the locking connection, and make the movable handle 22 switch quickly between the locked state and the active state, avoiding unnecessary sheath rotation during the switching process. Moreover, when the delivery device 100 is not in use, by establishing a locking connection between the mounting part 41 and the movable handle 22, the movable handle 22 is always locked in the axial and circumferential directions. Compared with the existing method of locking by screwing the movable handle 22 to the fixed handle 21 to generate friction, the locking component 4 provided in this application can maintain a better locking structure of the movable handle 22 during long-term storage and transportation, even if a collision occurs, avoiding the risk of the lock being released.

[0055] Example 3

[0056] In this embodiment, please refer to Figures 16-19 The sheath core assembly 1 and conveying handle 2 of the conveyor 100 are largely the same as those in Embodiments 1 and 2, except that the locking assembly 4 is sleeved on the outside of the screw 23, wherein the first limiting member 42 of the mounting part 41 is located at the end of the mounting part 41 opposite to the housing. (See also...) Figure 17 The second limiting member 226 has multiple locking holes 2264 circumferentially arranged along the outer side wall of the housing near the mounting part 41, and the multiple locking holes 2264 are spaced apart; the mounting part 41 has a first limiting member 42 on the outer side wall near the housing, and the first limiting member 42 is adapted to the locking holes 2264 to establish a locking connection. Please refer to Figure 18 and Figure 19The first limiting member 42 includes an insertion part 426 and a movable part 425. One end of the movable part 425 is movably connected to the mounting part 41, and the other end is connected to the insertion part 426. The movable part 425 can control the insertion part 426 to move closer to or away from the housing. When the insertion part 426 moves closer to the housing, it is inserted into any one of the slots 2264. The outer side wall of the mounting part 41 is provided with a receiving groove 411. The first limiting member 42 can be provided in the receiving groove 411 to be accommodated, reducing the area protruding from the conveyor 100. Furthermore, a rotating shaft 412 can be provided on both sides of the receiving groove 411 in the circumferential direction. One end of the movable part 425 is rotatably connected to the rotating shaft 412. In this way, the movable part 425 can control the insertion part 426 at the other end to move closer to or away from the housing by flipping along the rotating shaft 412.

[0057] In another embodiment, please refer to Figure 18 The outer wall of the mounting part 41 is provided with a receiving groove 411. The receiving groove 411 is provided with slide rails on both sides in the circumferential direction. One end of the movable part 425 is provided with sliding members extending into the slide rails on both sides in the circumferential direction, so that the movable part 425 can slide axially along the slide rails, thereby controlling the insertion part 426 at the other end to move closer to or away from the housing. With this configuration, the insertion part 426 is set as an elastic member, which can elastically control the insertion and exit of the card hole 2264 when the insertion part 426 is close to the card hole 2264; or the insertion part 426 is set as a movable member that can slide in and out of the card hole 2264 in the radial direction, and slide to control the insertion and exit of the card hole 2264.

[0058] For preferred options, please refer to [link / reference]. Figure 19 The insertion part 426 includes an extension plug 427 that enters the card hole 2264. The extension plug 427 may have a radial length and may extend to the surface thread of the screw 23 and engage with the surface thread. With this configuration, after the locking component 4 of this embodiment establishes a locking connection with the housing of the movable handle 22, the two circumferential limiting blocks 44 realize the circumferential limitation of the housing, while the engagement of the extension plug 427 with the surface thread can form an axial limitation. This further enables the locking component 4 to limit the movable handle 22 axially and circumferentially even when the switching device 224 of the movable handle 22 disengages from the screw 23.

[0059] In this embodiment, please refer to Figure 16 and Figure 18 The mounting part 41 can be connected to the movable handle 22 via a follower structure as in Embodiment 2 to achieve the same effect. The specific structure has been described in Embodiment 2 and will not be repeated here.

[0060] Example 4

[0061] In this embodiment, please refer to Figures 20-22The sheath core assembly 1 and conveying handle 2 of the conveyor 100 are largely the same as those in Embodiments 1 to 3, except that, please refer to [link to relevant documentation]. Figure 21 The second limiting member 226 has a plurality of second slots 2265 circumferentially formed along the end of the housing near the mounting part 41. Please refer to [link / reference]. Figure 22 The first limiting member 42 has a locking post 428 on the outer side wall of the mounting part 41. When the mounting part 41 and the second locking groove 2265 are in the same axial position, the locking post 428 is inserted into any one of the second locking grooves 2265. The mounting part 41 can slide along the axial direction of the screw 23, and the outer diameter of the mounting part 41 is smaller than the outer diameter of the second limiting component. Therefore, when the mounting part 41 slides to the end position of the housing, the mounting part 41 can be in the same axial position relative to the end side wall of the housing with the second limiting component. Since multiple second locking grooves 2265 are opened at this position, the locking post 428 is inserted into the locking groove to form a circumferential limiting on the housing.

[0062] For preferred options, please refer to further information. Figure 22 In this embodiment, to ensure that the locking assembly 4 can still limit the axial sliding of the movable handle 22 even when the user accidentally disengages the control block 221 of the switching device 224 from the outer wall of the screw 23, the outer wall of the mounting portion 41 is provided with a plurality of elastic claws 47. The elastic claws include extension portions 471 extending in a direction parallel to the longitudinal axis of the housing. One end of the extension portion 471 extends beyond one end of the mounting portion 41, and the other end extends beyond the other end of the mounting portion 41. The distal end of the extension portion 471 is provided with a limiting device. The positioning block 472 has a pressing part 473 formed on the side away from the movable handle 22. When the elastic pawl 47 is not subjected to external force, the limiting block 472 retracts towards the screw 23 and engages with it. Therefore, when the mounting part 41 is provided with a circumferential limiting block, the limiting block 472 cannot rotate circumferentially, thus creating an axial limit on the mounting part 41. In this way, when the mounting part 41 forms a locked connection through the first limiting member 42 and the second limiting member 226 of the movable handle 22, the mounting part 41 prevents the movable handle 22 from moving in either the circumferential or axial direction. When it is necessary to release the locked connection, pressing the pressing part 473 causes the limiting block 472 to disengage from the external thread of the screw 23, allowing the locking assembly 4 to disengage axially.

[0063] The above specific embodiments are only some embodiments of the present invention and are not intended to limit the present invention. This specification cannot exhaustively describe all embodiments of the present invention concept, and some features of the different embodiments described above can be substituted for or combined with each other. Those skilled in the art can also make simple substitutions according to actual needs. The concept of the present invention is subject to the claimed protection scope.

Claims

1. A conveyor characterized by, The sheath core assembly includes a sheath tube and a sheath tube joint connected to the proximal end of the sheath tube, and the delivery handle includes a fixed handle and a movable handle, the proximal end of the fixed handle is connected with a screw rod, the movable handle is sleeved on the screw rod, the sheath tube joint is arranged in the screw rod, and the sheath tube joint is connected with the movable handle through the side wall of the screw rod; the movable handle includes a movable state of rotating or dragging relative to the screw rod to adjust the axial position, and the delivery handle further includes a locking assembly, the locking assembly is used for establishing a locking connection with the movable handle, and the locking connection limits the movable state of the movable handle after being connected; The movable handle includes a shell, a tooth block and a switching device connected with the tooth block, the screw rod is provided with a spaced groove extending along the axial length on the opposite side wall, the sheath tube joint extends from the spaced groove on the two sides in the radial direction, and the switching device is used for controlling the tooth block to switch between engagement and disengagement with the outer wall of the screw rod; The locking assembly includes a mounting portion coaxially arranged with the screw rod, and the mounting portion is fixed relative to the screw rod at least in the circumferential direction; the mounting portion is slidably sleeved on the screw rod, and the inner wall of the mounting portion is provided with at least two circumferential limiting blocks, the circumferential limiting blocks respectively pass through the spaced grooves and extend into the inner cavity of the screw rod; The proximal end of the screw rod is connected with a rear release assembly, the sheath core assembly further includes an inner sheath core penetrating in the sheath tube, the rear release assembly includes a clamping portion and a screw cap, the clamping portion is inserted with a gripper, the outer wall is threadedly connected with the inner wall of the screw cap, the screw cap is provided with an inwardly protruding extrusion portion, the inner sheath core simultaneously penetrates through the clamping portion, the screw cap and the gripper, the extrusion portion moves along the axial direction to extrude or move away from the gripper with the rotation of the screw cap, so that the gripper clamps or releases the inner sheath core; the inner cavity of the clamping portion is provided with an insertion groove with a non-circular radial section, and the insertion part of the gripper inserted into the insertion groove has the same non-circular radial section.

2. The conveyor of claim 1, wherein, The mounting portion is provided with a first limiting piece, and the end of the shell opposite to the mounting portion in the axial direction is provided with a second limiting piece, and the first limiting piece and the second limiting piece can be fixedly connected when they are in the same axial position.

3. The conveyor of claim 2, wherein, The first limiting piece is arranged at the end of the mounting portion opposite to the shell, and the first limiting piece includes a plurality of first clamping grooves arranged in the circumferential direction; the outer side wall of the shell close to the mounting portion is provided with a sliding groove, the sliding groove has an axial length, the second limiting piece includes a sliding block, the sliding block is provided with a clamping block extending towards the inner embedding of the shell, the sliding block is arranged in the sliding groove and can slide in the axial direction of the sliding groove; when the sliding block slides to the side close to the mounting portion, the clamping block can be clamped in any one of the first clamping grooves.

4. The conveyor of claim 2, wherein, The second limiting member is provided with a plurality of clamping holes along the circumference of the outer side wall of the housing near the mounting portion, the mounting portion is provided with the first limiting member on the outer side wall of the housing near the mounting portion, the first limiting member comprises an insertion portion and a movable portion, one end of the movable portion is movably connected with the mounting portion, the other end is connected with the insertion portion, the movable portion can control the insertion portion to approach or move away from the housing, and the insertion portion can be inserted into any one of the clamping holes when the insertion portion approaches the housing.

5. Conveyor according to claim 3 or 4, characterized in that One end of the second limiting member provided on the housing in the axial direction is movably connected with the mounting portion in the circumferential direction.

6. The conveyor of claim 2, wherein, The second limiting member is provided with a plurality of second clamping grooves along the circumference of the end of the housing near the mounting portion, the first limiting member is provided with a clamping column on the outer side wall of the mounting portion, and the clamping column can be inserted into any one of the second clamping grooves when the mounting portion and the second clamping grooves are in the same axial position.

7. The conveyor of claim 6, wherein, The outer side wall of the mounting portion is provided with a plurality of elastic clamping claws, the elastic clamping claw comprises an extension portion extending in the direction parallel to the longitudinal axis of the housing, the distal end side of the extension portion is provided with a limiting block, and the limiting block is folded towards the screw direction and engaged with the screw in the state that the elastic clamping claw is not subjected to external force.

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