Conveyor rear release assembly and conveyor

Abstract

This invention provides a post-release assembly for a conveyor and a conveyor. The post-release assembly includes a sheath core, a fixed member, a movable member, and a rotating member. The sheath core passes through the cavities of the fixed member, the movable member, and the rotating member and is fixedly connected to the movable member. The movable member controls the sheath core to slide axially. The proximal end of the fixed member is axially slidably connected to the distal end of the movable member via a connecting post with a non-circular cross-section. The rotating member is sleeved on the fixed member and the movable member and can rotate circumferentially relative to the fixed member and the movable member, allowing the movable member to be axially locked or slid relative to the fixed member. When the rotating member rotates to a position where the movable member can slide axially, the movable member can drive the sheath core to retract with a greater stroke. Furthermore, during the post-release process, the non-circular cross-section connecting post can prevent the sheath core from rotating during unlocking, avoiding bracket torsion and inaccurate bracket positioning.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a delivery post-release assembly and 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 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. Iliac artery reconstruction requires the use of a delivery device to deliver and release the stent. Current delivery devices are prone to stent stacking or twisting during release, which can adversely affect the accuracy of stent release and, in severe cases, lead to surgical failure.

[0003] Currently, delivery systems typically use a post-release assembly to deploy the stent. When the patient's vascular model is highly curved, the limited release stroke can prevent the stent from being deployed from the distal end of the sheath to the proximal end. Furthermore, during the post-release procedure, the sheath rotates, causing the stent to twist and resulting in inaccurate stent positioning. Summary of the Invention

[0004] Therefore, it is necessary to provide a new conveyor rear release assembly and conveyor that can provide a rear release stroke suitable for different specifications of supports, while at least solving the problem of easy rotation when the sheath core is retracted to release the support.

[0005] A delivery device release assembly includes a sheath core and a fixed member, a movable member, and a rotating member, each having an internal cavity. The proximal end of the sheath core passes sequentially through the cavities of the fixed member, the rotating member, and the movable member and is fixedly connected to the movable member. The fixed member has a connecting post with a non-circular radial cross-section on its proximal side, and the connecting post is axially slidably connected to the distal end of the movable member. The rotating member is sleeved on the fixed member and the movable member, and at least covers a portion of the outer surface of the fixed member on its proximal side and a portion of the outer surface of the movable member on its distal side. The rotating member can rotate circumferentially relative to the fixed member and the movable member, allowing the movable member to be axially locked or slid relative to the fixed member.

[0006] In one embodiment, the outer surface of the near end of the fixed member is provided with a first surface groove, the outer surface of the far end of the movable member is provided with a second surface groove, and the inner sidewall of the rotating member is provided with protrusions near both ends of the axial direction. The protrusions are respectively located in the first surface groove and the second surface groove, and can slide in the first surface groove and the second surface groove respectively.

[0007] In one embodiment, both the first surface groove and the second surface groove include a long groove and a short groove continuously arranged in the circumferential direction, and the axial length of the long groove in one of the grooves is greater than the axial length of the short groove; the long groove of the first surface groove passes through the proximal end face of the fixed member, and the long groove of the second surface groove passes through the distal end face of the movable member.

[0008] In one embodiment, the short groove is provided with a raised first limiting block at a position close to the long groove in the circumferential direction, and the protrusion height of the first limiting block is less than the groove depth of the corresponding short groove.

[0009] In one embodiment, the first surface groove includes a first short groove, the second surface groove includes a second short groove, and the two protrusions include a first protrusion located at the distal end and a second protrusion located at the proximal end. When the second protrusion slides into the second short groove, the first protrusion slides into the first short groove.

[0010] In one embodiment, the first surface groove includes a first long groove, the second surface groove includes a second long groove, and when the second protrusion slides into the second long groove, the first protrusion slides into the first long groove or the first short groove.

[0011] In one embodiment, the second surface groove further includes at least an annular short groove spaced apart from the second short groove along the axial direction toward the proximal end; the connecting post has a non-circular cross-section block at least at its proximal end, and the movable member has a connecting blind hole at its distal end, and the blind hole has a circular cross-section hole at least at an axial position opposite to the annular short groove; when the second protrusion slides along the long groove into the annular short groove, the non-circular cross-section block slides into the circular cross-section hole.

[0012] In one embodiment, the connecting blind hole is provided with a non-circular cross-section hole between the distal end of the hole and the distal end of the annular short groove. The shape of the non-circular cross-section block is adapted to the shape of the non-circular cross-section hole, and the diameter of the circular cross-section hole is greater than the maximum radial dimension of the non-circular cross-section block.

[0013] In one embodiment, the connecting post located between the proximal end of the fixing block and the non-circular cross-section block includes a connecting rod, the maximum diameter of which is less than or equal to the minimum radial dimension of the non-circular cross-section hole.

[0014] A delivery device includes a handle assembly, an outer sheath, and a rear release assembly. The outer sheath is connected to the distal end of the handle assembly. The rear release assembly is fixedly connected to the proximal end of the handle assembly. After connection, the sheath core is movably inserted into the outer sheath. An anchor is provided on the side wall of the distal end of the sheath core. When the movable component slides towards the proximal end, the anchor is driven by the sheath core to slide and release the support towards the proximal end.

[0015] The beneficial effects of this invention are as follows: This invention provides a post-release assembly for a conveyor and a conveyor. The post-release assembly includes a sheath core and a fixed member, a movable member, and a rotating member, each with an internal cavity. The sheath core passes through the cavities of the fixed member, the movable member, and the rotating member and is fixedly connected to the movable member. The proximal end of the fixed member is axially slidably connected to the distal end of the movable member via a connecting post with a non-circular cross-section. The rotating member is sleeved on the fixed member and the movable member and at least covers a portion of the outer surface of the proximal end of the fixed member and a portion of the outer surface of the distal end of the movable member. The rotating member can rotate circumferentially relative to the fixed member and the movable member, allowing the movable member to be axially locked or slid relative to the fixed member. When the rotating member rotates to a position where the movable member can slide axially, the movable member can drive the sheath core to achieve a greater stroke of retraction. It is adaptable to the release of brackets of different specifications. Furthermore, during the release process after operation, the non-circular cross-section connecting post can prevent the sheath core from rotating during unlocking, avoiding bracket torsion and inaccurate bracket positioning. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the conveyor structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of the delivery and release assembly in this invention.

[0018] Figure 3 This is a schematic internal cross-sectional view of the delivery assembly in this invention.

[0019] Figure 4 This is a schematic diagram of the exploded structure of the delivery assembly in this invention.

[0020] Figure 5 This is a schematic diagram of the connection structure between the fixed part and the movable part in this invention.

[0021] Figure 6 This is a schematic diagram of the structure of the first limiting block inside the fixing member in Embodiment 1 of the present invention.

[0022] Figure 7This is a schematic diagram of the structure of the first limiting block inside the fixing member in another embodiment of the present invention.

[0023] Figure 8 This is a schematic diagram of the structure of the second limiting block of the "T"-shaped first surface groove in Embodiment 5 of the present invention.

[0024] Figure 9 This is a schematic diagram of the structure of the second limiting block of the "T"-shaped first surface groove in another embodiment of the present invention.

[0025] Figure 10 This is a schematic diagram of the structure of the first limiting block inside the fixing member in Embodiment 2 of the present invention.

[0026] Figure 11 This is a schematic diagram of the structure of the second limiting block of the "L"-shaped first surface groove in Embodiment 5 of the present invention.

[0027] Figure 12 This is a schematic diagram of the structure of the third limiting block in Embodiment 4 of the present invention.

[0028] Figure 13 For the present invention Figure 12 A magnified view of a portion of position A in the middle.

[0029] Figure 14 This is a schematic diagram of the structure of the fourth limiting block in Embodiment 4 of the present invention.

[0030] Figure 15 For the present invention Figure 14 A magnified view of the area at position B in the middle.

[0031] Figure 16 This is a schematic diagram of the structure of the movable component in Embodiment 1 of the present invention.

[0032] Figure 17 This is a schematic diagram of the surface groove structure of the fixed part and the movable part in Embodiment 3 of the present invention.

[0033] Figure 18 This is a schematic diagram of the rotating component in Embodiment 3 of the present invention.

[0034] Figure 19 This is a cross-sectional view of the internal structure of the delivery unit in Embodiment 6 of the present invention.

[0035] Figure 20 This is a schematic diagram of the structure of the movable component in Embodiment Six of the present invention.

[0036] Figure 21 This is a schematic diagram of the annular short groove structure of the movable part in Embodiment Six of the present invention.

[0037] Figure 22 This is an internal cross-sectional view of the movable component in Embodiment Six of the present invention.

[0038] Figure 23 This is a schematic diagram of the fastener in Embodiment Six of the present invention.

[0039] Figure 24 This is a schematic diagram of the external thread structure of the fastener in Embodiment Six of the present invention.

[0040] Figure 25 This is a schematic diagram of the internal thread structure of the movable part in Embodiment Six of the present invention. Detailed Implementation

[0041] To better understand the concept of this application, the following detailed description of the implementation methods of this application is provided in conjunction with the accompanying drawings. The following specific embodiments are only some embodiments of this application and are not intended to limit this application.

[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] 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.

[0044] To more clearly describe the structure of this application, the terms "proximal" and "distal" are used herein as conventional terms in the field of interventional medicine. Specifically, "distal" refers to the end furthest from the surgeon, and "proximal" refers to the end closest to the surgeon; "axial" refers to its length direction, and "radial" refers to the direction perpendicular to the "axial".

[0045] Please see Figure 1 and Figure 2 The delivery device 100 provided in this application is used to load a stent, which can be a lumen instrument, such as a lumen stent. The following description uses a lumen stent as an example. The stent includes a supporting frame and a covering membrane that covers the supporting frame. The covering membrane is wrapped around the supporting frame to form a lumen structure. A bare wave loop is provided at the distal end of the supporting frame for hooking and positioning; please refer to [link to relevant documentation]. Figure 1 The delivery device 100 includes a handle assembly 2, an outer sheath 3, and a post-delivery assembly 1. The handle assembly 2 includes a fixed handle and a movable handle. The fixed handle is connected to a guide rod, and the movable handle is sleeved on the guide rod and can slide axially relative to the guide rod. It is also connected to the outer sheath 3 to control the axial sliding of the outer sheath 3. The outer sheath 3 is used to accommodate a stent in a compressed state. When the outer sheath 3 slides axially towards the proximal end, the stent dislodges from the distal end of the outer sheath 3 and is released. The released stent self-expands and anchors to the vessel wall to achieve partial release. The outer sheath 3 extends from the distal end of the handle assembly 2 into the lumen and connects to the movable handle. The post-delivery assembly 1 is located at the handle... The proximal end of the guide rod of component 2 is fixedly connected, and after connection, the sheath core 15 can be movably inserted into the outer sheath tube 3; the side wall of the sheath core 15 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 sheath core 15 is connected to a guide head; the rear release component 1 of the conveyor is used to control the sheath core 15 to switch between a locked state and an axially sliding unlocked state. When the rear release component 1 of the conveyor is in the unlocked state, the sheath core 15 can slide relative to the outer sheath tube 3 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] Example 1

[0047] In this embodiment, please refer to Figures 2-4The delivery unit 1 includes a sheath core 15 and a fixed member 11, a movable member 13, and a rotating member 12, each with an internal cavity. The proximal end of the sheath core 15 passes through the cavities of the fixed member 11, the rotating member 12, and the movable member 13 in sequence and is fixedly connected to the movable member 13. The distal end extends into the outer sheath tube 3 and is used to load a support. The proximal end of the fixed member 11 is axially slidably connected to the distal end of the movable member 13 via a connecting post 140 with a non-circular cross-section. The purpose of the non-circular cross-section connecting post 140 is to prevent the rotating member 12 from rotating the movable member 13 when unlocking. Furthermore, it allows the movable member 13 to slide axially relative to the fixed member 11 while preventing it from rotating. The rotating member 12 is set with... A rotating member 12 is mounted on the fixed member 11 and the movable member 13, and at least covers a portion of the outer surface of the proximal end of the fixed member 11 and the distal end of the outer surface of the movable member 13. The rotating member 12 is sleeved on the fixed member 11 and the movable member 13 and is in close contact with their surfaces. The purpose of the rotating member 12 is to provide a releasable limiting structure between the fixed member 11 and the movable member 13. The rotating member 12 can rotate circumferentially relative to the fixed member 11 and the movable member 13. By rotating circumferentially, the rotating member 12 switches between an axially limiting state and an unlimited state on the fixed member 11 and the movable member 13, thereby allowing the movable member 13 to switch between slidable and non-slidable relative to the fixed member 11 axially. Please refer to further details. Figure 5 The limiting structure of the rotating member 12 for the fixed member 11 and the movable member 13 is achieved by surface grooves 10 provided on the outer surface of the fixed member 11 near the proximal end and the outer surface of the movable member 13 near the distal end, and by protrusions 180 provided on the inner sidewall of the cavity of the rotating member 12 near both axial ends. The protrusions 180 can slide in the surface grooves 10. The surface grooves 10 include a limiting part and a limiting release part distributed circumferentially. When the protrusions 180 slide to the limiting part, the protrusions 180 have no space for axial sliding in the surface grooves 10, so the relative position of the fixed member 11 and the movable member 13 is restricted, and the axial sliding of the movable member 13 is restricted. When the protrusions 180 slide to the limiting release part, the protrusions 180 have space for axial sliding in the surface grooves 10, so the movable member 13 can slide axially relative to the fixed member 11.

[0048] In this embodiment, please refer to Figure 5The surface groove 10 includes a long groove 110 and a short groove 120 continuously arranged circumferentially. The axial length of the long groove 110 is greater than the axial length of the short groove 120. The axial length of the short groove 120 is the same as the axial length of the protrusion 180, which is intended to limit the axial sliding space of the protrusion 180. The axial length of the long groove 110 is greater than the axial length of the protrusion 180, which is intended to release the locking relationship between the movable member 13 and the fixed member 11 when the protrusion 180 rotates to the position of the long groove 110, so that the protrusion 180 can slide out from the position of the long groove 110, thereby realizing the axial sliding of the movable member 13 relative to the fixed member 11. In one embodiment, at least the long groove 110 on the movable member 13 extends to its distal end face. The through structure of the long groove 110 allows the movable member 13 to continue to slide backward after the protrusion 180 slides out of the distal end face along the axial direction, thereby increasing the backward retraction distance of the sheath core 15 and increasing the release stroke of the rearward release.

[0049] In a preferred embodiment, please refer to Figures 5-7 The long groove 110 passes through the near end face of the fixed part 11 and the far end face of the movable part 13; both the fixed part 11 and the movable part 13 are provided with a through long groove 110, which allows the protrusions 180 at both ends of the rotating part 12 to slide out from the long groove 110 of the movable part 13, thereby increasing the retraction distance of the sheath core 15 and increasing the release stroke of the rear release; while the long groove 110 of the fixed part 11 facilitates the protrusions 180 to enter the surface groove 10 from the position of the long groove 110 when the rotating part 12 is assembled.

[0050] In one embodiment, see Figure 6 and Figure 7 The short groove 120 has a raised first limiting block 130 near the long groove 110 in the circumferential direction. The first limiting block 130 is located between the short groove 120 and the long groove 110. It is used to limit the rotation of the protrusion 180 when it rotates between the short groove 120 and the long groove 110 and slides from the short groove 120 to the long groove 110. The setting of the first limiting block 130 can firstly prevent the protrusion 180 from rotating arbitrarily when not in use, which would cause unnecessary damage to the hook structure. Secondly, it can provide a certain resistance when in use, prompting the user to switch from the short groove 120 to the long groove 110 and release the axial restriction relationship. The protrusion height of the first limiting block 130 is less than the groove depth of the short groove 120, which can effectively provide circumferential rotation restriction without completely restricting it. This ensures that if necessary, the protrusion 180 can jump from the short groove 120 to the long groove 110 when the user increases the torque.

[0051] In a further preferred embodiment, the corner of the first limiting block 130 adopts a smooth arc transition, which helps to reduce some of the resistance during the process of the protrusion 180 jumping from the short groove 120 to the long groove 110.

[0052] In this embodiment, please refer to Figure 5 and Figure 14 The fixed member 11 is provided with a first surface groove 111, and the movable member 13 is provided with a second surface groove 131. The first surface groove 111 includes a first elongated groove 1102, and the second surface groove 131 includes a second elongated groove 1302. The protrusion 180 includes a first protrusion 121 located at the distal end and a second protrusion 122 located at the proximal end. The projections of the first protrusion 121 and the second protrusion 122 on the radial section of the rotating member 12 form a 0° angle with the line connecting them to the axis, and they are located on the same axis. With this arrangement, the first surface groove 111 and the second surface groove 131 are respectively aligned with the axis of rotation. The first protrusion 121 and the second protrusion 122 are arranged opposite each other and have the same axial position. The first protrusion 121 slides in the first surface groove 111 and the second protrusion 122 slides in the second surface groove 131. The first protrusion 121 and the second protrusion 122 rotate synchronously. When the first protrusion 121 slides into the first long groove 1102 and the second protrusion 122 slides into the second long groove 1302, the first protrusion 121 and the second protrusion 122 can both slide simultaneously along the axial direction of the first long groove 1102 and the second long groove 1302.

[0053] Please refer to Figure 5 The first surface groove 111 also includes a first short groove 1101, and the second surface groove 131 also includes a second short groove 1301. When the second protrusion 122 slides into the second short groove 1301, in order to ensure that the movable part 13 is in a locked state that cannot slide axially relative to the fixed part 11, it is necessary to satisfy that the first protrusion 121 slides into the first short groove 1101 at this time, and both protrusions are located in the short groove 120. Then the axial sliding is restricted, and the release structure is in a locked state to prevent sliding.

[0054] In this embodiment, please refer to Figure 3 and Figure 4The delivery unit 1 also includes a Luer connector 14 and a gripper 16. The gripper 16 is inserted into the distal inner cavity 132 of the Luer connector 14, and the sheath core 15 passes through the gripper 16. The distal end of the Luer connector 14 is inserted into and screwed into the proximal inner cavity of the movable member 13. When inserted, the gripper 16 secures the sheath core 15. The sheath core 15 is fixed to the distal inner cavity 132 of the Luer connector 14 by the gripper 16, while the distal end of the Luer connector 14 is fixed to the movable member 13 by a threaded connection, thereby achieving... The sheath core 15 is fixedly installed relative to the movable part 13, thereby ensuring that the sheath core 15 slides axially as the movable part 13 moves axially, thus achieving release. The gripper 16 has a tubular cavity that runs through the front and back, and the distal end is surrounded by mutually separated elastic sheets, with the distal sidewalls of the elastic sheets all protruding outwards. When the gripper 16 is inserted into the distal end of the Luer connector 14, the protrusions of the distal sidewalls of the elastic sheets are interference-fitted with the inner cavity of the Luer connector 14, thereby further pressing the sheath core 15 and achieving a stable clamping.

[0055] In this embodiment, please refer to Figures 6-9 Two short grooves 1101 are provided, and are respectively located on both sides of the first long groove 1102 in the circumferential direction. Together with the first long groove 1102, they form a "T"-shaped first surface groove 111. The "T"-shaped first surface groove 111 allows the moving part 13 to be locked relative to the fixed part 11 when the first protrusion 121 of the rotating part 12 is in the initial first short groove 1101, and it cannot slide axially. When the first protrusion 121 is in the first long groove 1102 in the middle position, both the first protrusion 121 and the second protrusion 122 can slide axially relative to the long groove. When the first protrusion 121 passes through the first long groove 1102 in the middle position and continues to rotate to the first short groove 1101 on the other side, the first protrusion 121 cannot move axially relative to the first surface groove 111, while the second protrusion 122 can still slide axially along the second long groove 1302.

[0056] For preferred options, please refer to [link / reference]. Figure 9 In another embodiment, the first limiting block 130 may be disposed in the first short groove 1101 located on both sides, or it may be disposed in one of the first short grooves 1101.

[0057] Example 2

[0058] In this embodiment, please refer to Figure 10 and Figure 11The structure of the post-release assembly 1 of the conveyor and the structure of the conveyor 100 are largely the same as in Embodiment 1. The difference is that a first short groove 1101 is provided and is located on any side of the first long groove 1102 in the circumferential direction, forming an "L"-shaped first surface groove 111 together with the first long groove 1102. When the first protrusion 121 is located in the first short groove 1101, the second protrusion 122 is located in the second short groove 1301; when both protrusions 180 at both ends are located in the short groove 120, the protrusions... The axial sliding of 180 is limited by the axial length of the short shaft and is in a locked state. At this time, the movable part 13 cannot slide axially relative to the fixed part 11. When the rotating part 12 rotates and the first protrusion 121 and the second protrusion 122 at both ends slide out of the short groove 120 and slide towards the long groove 110, the first protrusion 121 and the second protrusion 122 at both ends can slide in the long groove 110. Then the movable part 13 can slide axially relative to the fixed part 11, realizing the release of the bracket by retracting the sheath core 15.

[0059] Example 3

[0060] In this embodiment, please refer to Figures 17-18 The structure of the post-release assembly 1 of the conveyor and the structure of the conveyor 100 are largely the same as in Embodiment 1, except that the fixed member 11 is provided with a first surface groove 111, and the movable member 13 is provided with a second surface groove 131. The first surface groove 111 includes a first elongated groove 1102, and the second surface groove 131 includes a second elongated groove 1302. The protrusion 180 includes a first protrusion 121 located at the distal end and a second protrusion 122 located at the proximal end, and the projection of the first protrusion 121 and the second protrusion 122 on the radial section of the rotating member 12 forms a 180° angle with the line connecting them to the axis. With this arrangement, the first surface groove 111 is provided with a first surface groove 111, and the movable member 13 is provided with a second surface groove 131. The surface groove 111 and the second surface groove 131 are respectively arranged opposite to the first protrusion 121 and the second protrusion 122; thereby ensuring that the first protrusion 121 slides in the first surface groove 111 and the second protrusion 122 slides in the second surface groove 131. The first protrusion 121 and the second protrusion 122 rotate synchronously. When the first protrusion 121 slides into the first long groove 1102 and the second protrusion 122 slides into the second long groove 1302, the first protrusion 121 and the second protrusion 122 can both slide simultaneously along the axial direction of the first long groove 1102 and the second long groove 1302.

[0061] Example 4

[0062] In this embodiment, please refer to Figures 12-15The structure of the post-release assembly 1 of the conveyor and the structure of the conveyor 100 are largely the same as in Embodiment 1. The difference is that the outer wall of the near end of the fixed member 11 is provided with a raised third limiting block 160 along the edge, and the inner wall of the far end of the rotating member 12 is provided with a raised fourth limiting block 170 along the edge. When the third limiting block 160 and the fourth limiting block 170 approach each other, they abut against each other to form an axial limiting structure. The third limiting block 160 is a convex ring structure that protrudes along the edge of the outer wall of the near end of the fixed member 11, and the fourth limiting block 170 is a convex ring structure that protrudes along the edge of the inner wall of the far end of the rotating member 12. The two convex ring structures can abut against each other when the rotating member 12 moves axially relative to the fixed member 11 to form an axial limiting structure and prevent the rotating member 12 from slipping off the fixed member 11.

[0063] Preferably, in this embodiment, when the third limiting block 160 and the fourth limiting block 170 are provided, the second limiting block 150 is not provided in the first long groove 1102.

[0064] Example 5

[0065] In this embodiment, please refer to Figure 8 , Figure 9 and Figure 11 The structure of the post-release assembly 1 of the conveyor and the structure of the conveyor 100 are largely the same as those in Embodiments 1 and 2. The difference is that a second limiting block 150 is also provided in the first long groove 1102. The second limiting block 150 is located in the portion of the first long groove 1102 that extends beyond the short groove 120 in the length direction of the first long groove 1102. The length of the first long groove 1102 exceeds the length of the first short groove 1101. This portion is where the protrusion 180 can slide axially within the first long groove 1102. The second limiting block 150 is provided in this portion, which allows the protrusion 180 to slide axially along the first long groove 1102. The sliding action serves as a limit to prevent the rotating part 12 from axially slipping off relative to the fixed part 11. It can be understood that the second limiting block 150 is only located in the first long groove 1102 of the fixed part 11, thereby only restricting the axial movement of the first protrusion 121 within the first long groove 1102, preventing the rotating part 12 from axially slipping off after assembly. When the user increases the pulling force, the first protrusion 121 can slide further along the axial direction of the first long groove 1102, achieving a axial retraction of the axis of two long grooves or a greater length; increasing the retraction distance of the sheath core 15 and increasing the release stroke of the release.

[0066] Example 6

[0067] In this embodiment, please refer to Figures 19-21The structure of the delivery assembly 1 and the delivery device 100 are largely the same as in Embodiments 1 and 2. The difference lies in that, in order to allow the sheath core 15 to be pushed a certain distance distally after the stent is released, so as to avoid the guide head at the front end of the sheath core 15 obstructing the insertion of the iliac stent delivery device, please refer to [link to documentation]. Figure 20 and Figure 21 The second surface of the movable member 13 is provided with multiple second short grooves 1301 along the axial direction towards the proximal end. The multiple second short grooves 1301 are spaced apart to form a multi-segment limiting member structure, and the multiple second short grooves 1301 are connected by a second long groove 1302. Here, the length of the connecting column 140 and the length of the rotating member 12 are correspondingly increased. With this configuration, when the second protrusion is pulled out from the distal end of the second long groove 1032, the sheath core 15 can be retracted and released relative to the stent. Furthermore, when it is necessary to push the sheath core 15 back towards the distal end to avoid the orifice of the internal iliac vessel, the movable member 13 is pushed distally to make the second protrusion slide out from the distal second short groove 1301. After sliding out, it moves along the second long groove 1302 into the second short groove 1301 located at the proximal end, thereby realizing the movement of the sheath core 15 distally along the axis and being able to move into the proximal second short groove 1301 to achieve axial limiting.

[0068] For further details, please refer to Figure 21 and Figure 22 The second surface groove of the movable member 13 further includes at least an annular short groove 1303 spaced apart from the second short groove 1301 along the axial direction toward the proximal end. The second long groove 1302 communicates with the second short groove 1301 and the annular short groove 1303 in the circumferential direction, so that the second protrusion can slide along the second long groove 1302 not only toward the distal end of the movable member 13, but also toward the proximal end into the annular short groove to realize the circumferential rotation of the movable member 13.

[0069] Please see here. Figure 22 and Figure 23When the movable member 13 retracts towards the proximal end, to prevent the rotation of the sheath core 15 from causing the support to twist or shift at the distal end, the connecting post 140 is provided with a non-circular cross-section block 1402 at least in its proximal portion to restrict circumferential rotation. The distal end of the movable member 13 has a connecting blind hole 1311, which includes a non-circular cross-section hole 13111 and a circular cross-section hole 13112 along the axial direction. Furthermore, the non-circular cross-section hole 1311 is located between the distal end opening and the distal end position of the annular short groove 1303. 1. A circular cross-section hole 13112 is provided at least in the axial position opposite to the annular short groove 1303; when the second protrusion slides along the long groove into the annular short groove 1303, the non-circular cross-section block 1402 slides into the circular cross-section hole 13112. The purpose of providing the non-circular cross-section hole 13112 is to limit the non-circular cross-section block 1402 in the circumferential direction so that the movable part 13 is moved to the rearward position and avoids circumferential rotation, and when the rotating part 12 is unlocked, it prevents the movable part 13 from rotating and avoids the sheath core 15 from rotating and causing the bracket to twist. The purpose of setting the circular cross-section hole 13112 is that when the non-circular cross-section block 1402 moves to the position of the circular cross-section hole 13112, the second protrusion moves into the annular short groove 1303, and the front end of the sheath core 15 has completed its movement toward the distal end. At this time, since the sheath core 15 itself is relatively thin and has limited support strength, after the stent is released, it will tilt and bend in any direction in the body due to gravity or other factors, thereby obstructing the insertion of the sheath core 15 or auxiliary instruments such as guide wires during the delivery of the internal iliac stent. Here, the rotation of the movable part 13 can drive the rotation of the sheath core 15 to adjust the distal anchor or guide head to deflect in a direction that does not obstruct the internal iliac vessels, thereby avoiding the sheath core 15 from affecting the subsequent stent implantation.

[0070] For details, please continue reading. Figure 22 and Figure 23 The shape of the non-circular cross-section block 1402 is adapted to the shape of the non-circular cross-section hole 13111, and the diameter of the circular cross-section hole 13112 is greater than the maximum radial dimension of the non-circular cross-section block 1402. The adaptation of the shape of the non-circular cross-section block 1402 to the shape of the non-circular cross-section hole 13111 allows the mutual adaptation restriction of the two non-circular cross-sections to form a circumferential rotation restriction when the movable member 13 slides axially toward the proximal end, thereby preventing the rotation of the sheath core 15, and preventing the movable member 13 from rotating when the rotating member 12 is unlocked, thus preventing the sheath core 15 from rotating and causing the bracket to twist. Furthermore, in order to allow the non-circular cross-section block 1402 to rotate freely when it moves to the circular cross-section hole 13112, the diameter of the circular cross-section hole 13112 is made greater than the maximum radial dimension of the non-circular cross-section block 1402, thereby preventing the rotation of the non-circular cross-section block 1402 from being affected and ensuring smooth rotation.

[0071] In this embodiment, please refer to Figure 23 and Figure 24 The connecting post 140, located between the proximal end of the fixed block and the non-circular cross-section block 1402, includes a connecting rod 1401. To ensure that the rotation of the non-circular cross-section block 1402 is not restricted when entering the circular cross-section hole 13112, the maximum diameter of the connecting rod 1401 is less than or equal to the minimum radial dimension of the non-circular cross-section hole 13111. Thus, when the non-circular cross-section block 1402 moves within the non-circular cross-section hole 13111, its axial rotation is restricted. At this time, the retractable sheath core 15 can slide axially but not axially. When the non-circular cross-section block 1402 reaches the circular cross-section hole 13112 due to the forward push of the movable member 13, the movable member 13 can rotate. At this time, the connecting rod 1401 of the connecting post 140 is located within the non-circular cross-section hole 13111, avoiding affecting the rotation of the movable member 13. This ensures that the movable member 13 can circumferentially adjust the direction of the sheath core 15 after being pushed forward to the distal end, so as to avoid subsequent guide wires or another sheath core 15.

[0072] In some embodiments, please refer to Figure 24 and Figure 25 The axial length of the connecting post 140 is equal to the length of the connecting blind hole 1311, and the bottom of the connecting blind hole 1311 is opposite to the proximal end of the annular short groove 1303. The circular cross-section hole 13112 is located at the bottom of the hole. Thus, when the non-circular cross-section block 1402 of the connecting post 140 moves into the circular cross-section hole 13112 of the connecting blind hole 1311, it abuts against the bottom of the hole. The side wall of the circular cross-section hole 13112 near the bottom of the hole is provided with an internal thread structure 131121, and the non-circular cross-section block 1402 is at least partially provided with a circular arc surface. The circular arc surface may be provided with an external thread structure 1403, so as to thread-fit with the internal thread structure 131121. In this way, the non-circular cross-section block 1402 can achieve fine adjustment of direction in the circular cross-section hole 13112 by rotating the thread, thereby ensuring the stability of the distal end of the sheath core 15 rotating in the body.

[0073] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A conveyor rear release assembly characterized by, The sheath core is sequentially inserted into the cavity of the fixed part, the rotating part and the movable part, and is fixedly connected with the movable part; the proximal end of the fixed part is provided with a connecting column with a non-circular radial section, and the connecting column is axially slidably connected with the distal end of the movable part; the rotating part is sleeved on the fixed part and the movable part, and covers at least part of the outer surface of the proximal end of the fixed part and part of the outer surface of the distal end of the movable part; the rotating part can rotate circumferentially relative to the fixed part and the movable part, so that the movable part can be axially locked or slid relative to the fixed part. The outer surface of the proximal end of the fixed part is provided with a first surface sliding groove, the outer surface of the distal end of the movable part is provided with a second surface sliding groove, the inner side wall of the rotating part is provided with a protrusion near the two axial ends, the protrusion is arranged in the first surface sliding groove and the second surface sliding groove respectively, and can slide in the first surface sliding groove and the second surface sliding groove respectively. The first surface sliding groove and the second surface sliding groove each include a long slot and a short slot arranged continuously in the circumferential direction, and the axial length of the long slot in one of the sliding grooves is greater than the axial length of the short slot.

2. The conveyor rear release assembly of claim 1, wherein, The long slot of the first surface sliding groove penetrates the proximal end face of the fixed part, and the long slot of the second surface sliding groove penetrates the distal end face of the movable part.

3. The conveyor rear release assembly of claim 1, wherein, The short slot is provided with a protruding first limiting block near the position of the long slot in the circumferential direction, and the protruding height of the first limiting block is less than the groove depth of the corresponding short slot.

4. The conveyor rear release assembly of claim 1, wherein, The first surface sliding groove includes a first short slot, the second surface sliding groove includes a second short slot, the two protrusions include a first protrusion at the distal end and a second protrusion at the proximal end, when the second protrusion slides into the second short slot, the first protrusion slides into the first short slot.

5. The conveyor rear release assembly of claim 4, wherein, The first surface sliding groove includes a first long slot, the second surface sliding groove includes a second long slot, when the second protrusion slides into the second long slot, the first protrusion slides into the first long slot or the first short slot.

6. The conveyor rear release assembly of claim 5, wherein, The second surface sliding groove further includes at least a ring-shaped short slot spaced from the second short slot in the proximal direction in the axial direction; at least the proximal portion of the connecting column is provided with a non-circular cross-section block, the distal end of the movable part is provided with a connecting blind hole, and the blind hole is provided with a circular cross-section hole at least at the axial position opposite to the ring-shaped short slot; when the second protrusion slides into the ring-shaped short slot along the long slot, the non-circular cross-section block slides into the circular cross-section hole.

7. The conveyor rear release assembly of claim 6, wherein, The connecting blind hole is provided with a non-circular cross-section hole between the distal end aperture extending to the distal end position of the ring-shaped short slot, the shape of the non-circular cross-section block is matched with the shape of the non-circular cross-section hole, and the diameter of the circular cross-section hole is greater than the maximum radial dimension of the non-circular cross-section block.

8. The conveyor rear release assembly of claim 7, wherein, The connecting column includes a connecting rod between the proximal end of the fixed part and the non-circular cross-section block, and the maximum diameter of the connecting rod is less than or equal to the minimum radial dimension of the non-circular cross-section hole.

9. A conveyor characterized by, The stent delivery device comprises a handle assembly, an outer sheath and a delivery device rear release assembly according to any one of claims 1-8, the outer sheath is connected with the distal end of the handle assembly; the delivery device rear release assembly is fixedly connected with the proximal end of the handle assembly, and the sheath core is movably arranged in the outer sheath after connection; the side wall of the distal end of the sheath core is provided with an anchoring part, and when the movable part slides towards the proximal end, the anchoring part is driven by the sheath core to slide towards the proximal end to release the stent.

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