A conveying device

Abstract

The embodiment of the present invention discloses a conveying device for conveying a main body stent containing a window structure, the conveying device comprising: a sheath core assembly; an outer sheath tube, which is hollow and sleeved on the outside of the sheath core assembly, a conveying gap between the outer sheath tube and the sheath core assembly, and the distal end of the conveying gap is used to accommodate the shrunk main body stent; a pre-buried guide wire, which enters from the proximal end of the conveying gap and extends to the distal end of the conveying gap, the distal end of the pre-buried guide wire is used to enter from the outside of the main body stent through the window structure to the inside of the main body stent, and the pre-buried guide wire is used to guide the branch guide wire to pass through the window structure of the main body stent from the inside. The present invention has the advantage of reducing the difficulty of the branch guide wire passing through the main body stent.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to a delivery device. Background Art

[0002] Abdominal aortic aneurysm (AAA) is a common aortic disease. Epidemiological studies show that the incidence rate of AAA in men is 5%, but in patients aged 80 and above, the incidence rate increases to 10%, and the risk of rupture of its aneurysm body is higher than that of other populations.

[0003] The existing main treatment methods for abdominal aortic aneurysm include traditional open surgery and endovascular aneurysm repair. Each method has its own advantages. Since the first case of endovascular aneurysm repair (EVAR) was reported in the 1990s for the treatment of abdominal aortic aneurysm, it has developed rapidly within just 20 years due to its advantages such as small trauma, short operation and hospitalization time, fast postoperative recovery, low perioperative mortality rate and complication incidence rate.

[0004] The greatest advantage of endovascular aneurysm repair is that it does not require thoracotomy or laparotomy, does not require clamping of blood vessels, there is no ischemia of internal organs during the operation, and there are few complications. However, the greatest limitation is that the visceral large arteries cannot be covered, especially the superior mesenteric artery and the renal artery. Endovascular aneurysm repair involving the renal artery field remains a difficult point.

[0005] Currently, "fenestrated stent-grafts" are used to implant stent-grafts in such patients, that is, a main stent is implanted in the abdominal aorta, a fenestration structure is opened in the main stent, and a branched stent-vessel is installed in the fenestration structure to lead to the branched blood vessels. The stent-grafts implanted for endovascular treatment of abdominal aortic aneurysm involve the reconstruction of four branched arterial blood vessels, namely the celiac trunk artery, the superior mesenteric artery, and the left and right renal arteries.

[0006] In the prior art, after the main stent is implanted into the arterial blood vessel, it is necessary to repeat the implantation of the branched stent. Before implanting the branched stent, it is necessary to guide the branched guide wire through the fenestration structure of the main stent into the branched blood vessel, and then guide the branched stent through the fenestration structure of the main stent to the branched blood vessel via the branched guide wire. However, it is very difficult to guide the branched guide wire to the branched blood vessel. The reason is that the branched guide wire has to pass through the fenestration structure of the main stent to reach the branched blood vessel, and it is very difficult for the distal end of the branched guide wire to align with and pass through the fenestration structure of the main stent. How to effectively reduce the difficulty of the branched guide wire reaching the branched blood vessel through the fenestration structure is a problem that current medical staff and medical R & D personnel must jointly solve. Summary of the Invention

[0007] The technical problem to be solved by the embodiments of the present invention is to provide a delivery device that can reduce the difficulty of the branched guide wire passing through the fenestration structure of the main stent to find the branched blood vessel.

[0008] To solve the above technical problems, an embodiment of the present invention provides a conveying device for conveying a main bracket with a fenestration structure, and the conveying device includes:

[0009] A sheath-core assembly;

[0010] An outer sheath tube, which is hollow and sleeved outside the sheath-core assembly, and there is a conveying gap between the outer sheath tube and the sheath-core assembly, and the distal end of the conveying gap is used to accommodate the shrunk main bracket;

[0011] A pre-embedded guide wire, which enters from the proximal end of the conveying gap and extends to the distal end of the conveying gap, and the distal end of the pre-embedded guide wire is used to enter the inner side of the main bracket from the outside of the main bracket through the fenestration structure, and the pre-embedded guide wire is used to guide the branch guide wire to penetrate out of the fenestration structure of the main bracket from the inner side.

[0012] In an embodiment of the present invention, a locking assembly is provided on the proximal side of the conveying device, and the locking assembly is used to lock the movement of the pre-embedded guide wire.

[0013] In an embodiment of the present invention, the conveying device further includes:

[0014] A control handle, which is connected to the proximal end of the outer sheath tube;

[0015] A tail end fixing member, which is fixedly connected to the proximal end of the control handle;

[0016] A tail end slide member, which is fixedly connected to the proximal end of the tail end fixing member, and the locking assembly is provided on the tail end slide member, and the pre-embedded guide wire passes through the tail end slide member and the tail end fixing member and enters the conveying gap.

[0017] In an embodiment of the present invention, the tail end slide member includes a hollow tail slideway, and the tail slideway is communicated with the conveying gap; the locking assembly includes a wire fixing member, a fixing convex ring fixed on the tail slideway and a retaining piece fixed in the tail slideway, and the pre-embedded guide wire enters from the gap between the wire fixing member and the retaining piece, and the wire fixing member and the fixing convex ring can be movably connected by threads, and when the fixing member presses the pre-embedded guide wire against the convex ring, the movement of the pre-embedded guide wire is locked.

[0018] In an embodiment of the present invention, the conveying device further includes a control handle, and the control handle is connected to the outer sheath tube, and the control handle controls the outer sheath tube to make an axial movement relative to the sheath-core assembly so that the shrunk main bracket is in a partially released state or a fully released state.

[0019] In an embodiment of the present invention, the conveying device further includes a stent binding assembly, which is configured to prevent the released part of the main stent from fully expanding to reduce the outer diameter when the main stent is in a partially released state, and to fully expand the main stent when the main stent is in a fully released state.

[0020] In an embodiment of the present invention, the stent binding assembly includes at least one control wire, which enters from the proximal end of the conveying gap and extends to the distal end of the conveying gap, and the distal end of the control wire is configured to circumferentially bind the released part of the main stent.

[0021] In an embodiment of the present invention, the stent binding assembly further includes a pull ring, which is fixedly connected to the proximal end of the control wire, and a force is applied proximally through the pull ring to release the binding of the control wire to the main stent.

[0022] In an embodiment of the present invention, the conveying device further includes another locking assembly, which is configured to lock the movement of the stent binding assembly to prevent accidental release of the binding of the control wire to the main stent.

[0023] In an embodiment of the present invention, a sheath connector is fixedly connected to the outside of the outer sheath; the control handle includes:

[0024] A supporting body, inside which the sheath connector is provided. When an axial force is applied to the sheath connector, it moves axially within the supporting body to drive the outer sheath to move axially.

[0025] A fixed handle, which is installed on the outside of the distal end of the supporting body and fixedly connected to it.

[0026] A sliding handle, which is installed on the outside of the supporting body. The sliding handle is arranged adjacent to the proximal end of the fixed handle and is rotatable on the outside of the supporting body to drive the sheath connector to move axially.

[0027] In an embodiment of the present invention, a long hole extending axially is provided on the supporting body, and a main body tooth block is sleeved on the outside of the supporting body. The sheath connector includes a connector body and an abutting block. The connector body includes a distal convex block. The abutting block and the distal convex block respectively abut against the proximal end and the distal end of the main body tooth block to limit the axial movement of the main body tooth block relative to the sheath connector. An internal thread is provided on the inside of the sliding handle, and an external thread is provided on the outside of the main body tooth block. The internal thread meshes with the external thread. When the sliding handle rotates, the sheath connector is driven to move axially through the main body tooth block, the abutting block and the distal convex block, and further drives the outer sheath to move axially.

[0028] In one embodiment of the present invention, the sliding handle can slide axially on the supporting body, and a release button is embedded in the fixed handle. The release button extends a hook to one side of the sliding handle. The hook hooks the sliding handle so that the sliding handle is arranged adjacent to the fixed handle and prevents the sliding handle from sliding in the axial direction.

[0029] In one embodiment of the present invention, the delivery device also includes a push rod, the distal end of which is located in the delivery gap. When the control handle controls the outer sheath tube to move axially proximally relative to the sheath core assembly, the push rod is used to resist the main body support to prevent the main body support from moving toward the proximal end of the delivery gap.

[0030] In one embodiment of the present invention, the conveying device further comprises a support tube, the distal end of the support tube is located in the conveying gap, and the push rod is located in the support tube.

[0031] In one embodiment of the present invention, the push rod is provided with a plurality of through holes in the axial direction, and the embedded guide wire enters from the proximal end of the through hole and passes out from the distal end of the through hole.

[0032] Implementing the embodiments of the present invention has the following beneficial effects:

[0033] Since the delivery device includes a pre-buried guide wire, which enters from the proximal end of the delivery gap and extends to the distal end of the delivery gap, the distal end of the pre-buried guide wire is used to enter from the outside of the main stent through the window structure to the inside of the main stent, and the pre-buried guide wire is used to guide the branch guide wire to pass through the window structure of the main stent from the inside. Thus, through the guidance of the pre-buried guide wire, the branch guide wire can easily pass through the window structure of the main stent, and then continue to push the branch guide wire, and the branch guide wire can easily enter the branch blood vessel. Thereafter, through the guidance of the branch guide wire, the branch stent can easily pass through the window structure of the main stent to reach the branch blood vessel, thereby facilitating the delivery of the branch stent. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 is a three-dimensional diagram of a conveying device according to an embodiment of the present invention;

[0036] Figure 2 is a cross-sectional view of a conveying device according to an embodiment of the present invention in one direction;

[0037] Figure 3It is a cross-sectional view of a conveying device according to an embodiment of the present invention in another direction;

[0038] Figure 4 It is Figure 2 an enlarged view of the circled part A in

[0039] Figure 5 It is Figure 2 an enlarged view of the circled part B in

[0040] Figure 6 It is Figure 3 an enlarged view of the circled part D in

[0041] Figure 7 It is Figure 2 an enlarged view of the circled part C in

[0042] Figure 8 It is Figure 3 an enlarged view of the circled part E in

[0043] Figure 9 It is a schematic diagram of a conveying device according to an embodiment of the present invention at an angle (the main body bracket is in a partially released state);

[0044] Figure 10 It is a schematic diagram of a conveying device according to an embodiment of the present invention at another angle (the main body bracket is in a partially released state);

[0045] Figure 11 It is a schematic diagram of a main body bracket according to an embodiment of the present invention when it is in a fully released state;

[0046] Figure 12 It is a schematic diagram of a main body bracket according to an embodiment of the present invention when it is in a partially released state in an arterial blood vessel;

[0047] Figure 13 It is a schematic diagram of a branch guide wire reaching a branch blood vessel via a main body bracket in an arterial blood vessel according to an embodiment of the present invention;

[0048] Figure 14 It is a schematic diagram of a branch stent being guided through a main body bracket in an arterial blood vessel to reach a branch blood vessel via a branch guide wire according to an embodiment of the present invention;

[0049] Illustration reference numerals:

[0050] 100 - Sheath - core assembly; 110 - Inner sheath - core; 120 - Outer sheath - core tube; 130 - Guide head; 131 - Hollow channel; 140 - Bracket fixing assembly; 142 - Positioning sleeve; 143 - Fixed anchor; 150 - Sheath - core tube fixing piece; 160 - Sheath - core fixing steel sleeve; 170 - Rear release screw cap; 200 - Outer sheath tube; 210 - Delivery gap; 220 - Sheath tube joint; 221 - Contact block; 222 - Joint body; 223 - Distal bump; 300 - Control handle; 310 - Support body; 320 - Fixed handle; 321 - Unlock button; 322 - Hook; 323 - Button support body; 324 - Positioning post; 330 - Sliding handle; 332 - Rotating cap; 333 - Inverted flange; 334 - Drag - reducing convex ring; 340 - Main body tooth block; 400 - Bracket binding assembly; 410 - Control wire; 420 - Pull ring; 500 - Another locking assembly; 510 - Pull - ring fixing piece; 520 - Near release screw cap; 610 - Push rod; 620 - Support tube; 630 - Push - rod fixing piece; 640 - Tail - end fixing piece; 650 - Tail - end slideway piece; 670 - Luer connector; 680 - Outer cover; 710 - Embedded guide wire; 720 - Locking assembly; 721 - Wire fixing piece; 722 - Fixed convex ring; 723 - Flap; 800 - Main body bracket; 810 - Tubular film; 811 - Window structure; 820 - Ring - shaped support frame; 830 - Connecting piece; 840 - Bare stent; 900 - Branch stent; 910 - Branch guide wire. Detailed implementation manners

[0051] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0052] The terms "including" and "having" and any variations thereof appearing in the specification, claims and drawings of this application are intended to cover non - exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices. In addition, the terms "first", "second", "third", etc. are used to distinguish different objects, rather than to describe a specific order.

[0053] For the sake of clear description, the end of the following delivery device close to the operator is the proximal end, and the end relatively far from the operator is the distal end; the end of the main body stent close to the heart is the proximal end, and the end relatively far from the heart is the distal end. The proximal and distal ends of the delivery device and the main body stent are defined by different reference objects.

[0054] An embodiment of the present invention provides a delivery device for delivering a main body stent. Here, the main body stent is loaded in the delivery device. The main body stent is provided with a fenestration structure, and the number of the fenestration structures can be one or more. Please refer to Figures 1 - 14 , the delivery device includes a sheath core assembly, an outer sheath tube, and a pre-embedded guide wire.

[0055] In this embodiment, please refer to Figures 1 - 4 , the sheath core assembly 100 includes an inner sheath core 110 and an outer sheath core tube 120. The outer sheath core tube 120 is hollow and sleeved on the inner sheath core 110, and the outer sheath core tube 120 can axially slide relative to the inner sheath core 110.

[0056] In this embodiment, the delivery device further includes a guiding head 130 and a stent fixing assembly 140. The guiding head 130 is conical, the distal end of the guiding head 130 is pointed, and a hollow channel 131 is formed axially along the center of the guiding head 130. The distal end of the inner sheath core 110 is fixedly connected to the proximal end of the guiding head 130, and the inner sheath core 110 is hollow and communicates with the hollow channel 131 of the guiding head 130. The stent fixing assembly 140 is arranged adjacent to the proximal end of the guiding head 130. The stent fixing assembly 140 includes a positioning sleeve 142 and a fixing anchor 143. The fixing anchor 143 is fixedly connected to the distal end of the outer sheath core tube 120. The fixing anchor 143 has a columnar structure, and a circle of uniformly spaced protrusions is circumferentially arranged thereon for fixing the bare stent 840 at the proximal end of the main body stent 800 (please refer to Figure 11 ), so as to position the proximal end of the main body stent 800, that is, the proximal end of the main body stent 800 is sleeved on the fixing anchor 143; the distal end of the positioning sleeve 142 is injection-molded and fixedly connected to the guiding head 130. The positioning sleeve 142 is hollow. The positioning sleeve 142 extends proximally to the fixing anchor 143 and partially sleeves on the fixing anchor 143. There is a limiting gap between the fixing anchor 143 and the inner wall of the positioning sleeve 142, and the proximal part of the main body stent 800 is located in this limiting gap.

[0057] In this embodiment, the outer sheath tube 200 is hollow and sleeved outside the sheath core assembly 100, specifically outside the outer sheath core tube 120, and the outer sheath tube 200 can axially move relative to the outer sheath core tube 120. There is a delivery gap 210 between the outer sheath tube 200 and the sheath core assembly 100. Specifically, the delivery gap 210 is located between the outer sheath tube 200 and the outer sheath core tube 120. The delivery gap 210 herein refers to the space between the inner wall of the outer sheath tube 200 and the outer wall of the outer sheath core tube 120. The entire fixing anchor 143 and the proximal part of the positioning sleeve 142 are located in the delivery gap 210. The distal end of the delivery gap 210 is used to accommodate the contracted main body stent 800. Here, the main body stent 800 is forced to reduce its volume by an external force to be accommodated in the delivery gap 210. The bare stent 840 at the proximal end of the main body stent 800 is positioned on the protrusion of the fixing anchor 143, and the entire main body stent 800 is located in the delivery gap 210.

[0058] In this embodiment, please refer to Figure 1 , Figure 2 , Figure 7 , Figures 12 - 14, the pre-embedded guide wire 710 enters from the proximal end of the conveying gap 210 and extends to the distal end of the conveying gap 210. At this time, the main support 800 has not yet been positioned on the protrusion of the fixing anchor 143. Thereafter, the pre-embedded guide wire 710 continues to move forward, and the distal end of the pre-embedded guide wire 710 enters from the outside of the main support 800 through the window structure 811 to the inside of the main support 800, and then the distal end of the pre-embedded guide wire 710 is positioned on the inside of the main support 800. Thereafter, the medical staff shrinks the main support 800 and places it in the conveying gap 210, and then pulls back the partially loosened pre-embedded guide wire 710, but the distal end of the pre-embedded guide wire 710 does not move. Thereafter, the conveying device enters the patient's arterial blood vessel. When it reaches the predetermined position, the conveying device releases part of the main support 800. At this time, the main support 800 is in a partially released state. Of course, in other embodiments of the present invention, the main support can also be completely released. The fenestration structure 811 on the main support 800 is exposed, and medical personnel can adjust the position of the fenestration structure 811 by axial or circumferential movement, for example, to make the fenestration structure 811 face the branch blood vessel. Of course, medical personnel do not have to adjust it. Afterwards, the medical staff pushes the embedded guide wire 710 toward the distal end, and the embedded guide wire 710 moves forward until the embedded guide wire 710 moves out from the other end of the blood vessel. Afterwards, the medical staff pulls the branch guide wire 910 through the embedded guide wire 710 and pulls the embedded guide wire 710 toward the proximal end. The embedded guide wire 710 guides the branch guide wire 910 into the blood vessel and continues to guide the branch guide wire 910 to pass through the window structure 811 of the main stent 800 from the inner side of the main stent 800. At this time, the embedded guide wire 710 is separated from the branch guide wire 910, and then the medical staff pushes the branch guide wire 910 on the other side, so that the branch guide wire 910 can continue to move forward and reach the branch blood vessel. Afterwards, the branch stent 900 can reach the branch blood vessel through the branch guide wire 910 and the window structure 811 of the main stent 800, and the branch stent 900 is communicated and connected with the main stent 800.

[0059] In this embodiment, through the guidance of the pre-embedded guide wire 710, the branch guide wire 910 can easily pass through the window structure 811 of the main stent 800, and then continue to push the branch guide wire 910, and the branch guide wire 910 can easily enter the branch blood vessel. Thereafter, through the guidance of the branch guide wire 910, the branch stent 900 can easily pass through the window structure 811 of the main stent 800 to reach the branch blood vessel, thereby facilitating the delivery of the branch stent 900.

[0060] In this embodiment, a locking assembly 720 is provided at the proximal side of the delivery device, and the locking assembly 720 can be used to lock the movement of the embedded guide wire 710. In this embodiment, see Figures 1 - 8, the conveying device further includes a control handle 300, a tail end fixing member 640, and a tail end sliding member 650. The control handle 300 is connected to the proximal end of the outer sheath tube. The tail end fixing member 640 is fixedly connected to the proximal end of the control handle 300. The tail end sliding member 650 is fixedly connected to the proximal end of the tail end fixing member 640. The locking assembly 720 is provided on the tail end sliding member 650. The pre-embedded guide wire passes through the tail end sliding member 650 and the tail end fixing member 640 and enters the conveying gap.

[0061] Specifically, the tail end sliding member 650 includes a hollow tail slideway, and the tail slideway communicates with the conveying gap 210. The pre-embedded guide wire 710 enters the tail slideway. The locking assembly 720 includes a wire fixing member 721, a fixed convex ring 722 fixed on the tail slideway, and a retaining piece 723 fixed in the tail end sliding member. The pre-embedded guide wire 710 enters through the gap between the retaining piece 723 and the wire fixing member 721. The wire fixing member 721 and the fixed convex ring 722 can be movably connected by threads. When the wire fixing member 721 presses the pre-embedded guide wire 710 against the retaining piece 723, the movement of the pre-embedded guide wire 710 is locked to prevent the pre-embedded guide wire 710 from being pulled to an inappropriate position due to a mistake.

[0062] In this embodiment, please refer to Figure 1 , Figure 2 , Figure 5 , Figure 6 , the control handle 300 is connected to the outer sheath tube 200. The control handle 300 is used to control the axial movement of the outer sheath tube 200 relative to the sheath core assembly 100, specifically to control the axial movement of the outer sheath tube 200 relative to the outer sheath core tube 120. In the Figure 1 schematic diagram, the left-right direction is the axial direction. Thus, by controlling the control handle 300 to control the axial movement of the outer sheath tube 200, the main body stent 800 located in the conveying gap 210 after contraction is in a partially released state or a fully released state. Here, the partially released state means that the proximal part of the main body stent 800 is released, and the released part of the main body stent 800 is no longer restricted by the outer sheath tube 200, which is the state when adjusting the position of the main body stent 800. Please refer to Figure 9 , Figure 10 , the fully released state means that the outer sheath tube 200 no longer restricts the entire main body stent 800, that is, there is no outer sheath tube 200 outside the main body stent 800 at this time. Please refer to Figure 11 . In this embodiment, the main body stent 800 is released step by step. Specifically: First, a part of the main body stent 800 is released. At this time, the released part of the main body stent 800 is exposed (please refer to Figure 9 , Figure 10), where the released part of the main stent 800 is on the proximal side of the main stent 800, and the remaining part of the main stent 800 is still in the delivery device. At this time, the main stent 800 is in a partially released state. Then, the position of the main stent 800 is adjusted. When the adjustment is in place, the remaining part of the main stent 800 is released later. At this time, the main stent 800 is completely released, and the main stent 800 is in a completely released state. In addition, in other embodiments of the present invention, the number of times of stepwise releasing the main stent is not limited to two, and may also be more times. In this embodiment, the fenestration structure 811 is located on the released part of the main stent when the main stent 800 is in a partially released state.

[0063] To adjust the axial position of the outer sheath 200, in this embodiment, please continue to refer to Figure 1 、 Figure 2 、 Figure 5 、 Figure 6 , the outer sheath 200 is fixedly connected to the sheath joint 220. In this embodiment, the outer side of the proximal end of the outer sheath 200 is fixedly connected to the sheath joint 220. When the sheath joint 220 moves axially, the sheath joint 220 will drive the outer sheath 200 to move axially. The control handle 300 includes a support body 310, a fixed handle 320, and a sliding handle 330. The support body 310 is hollow inside and the sheath joint 220 is provided inside. When an axial force is applied to the sheath joint 220, the sheath joint 220 moves axially in the support body 310 to drive the outer sheath 200 to move axially. The fixed handle 320 is installed on the outer side of the distal end of the support body 310 and the two are fixedly connected. The sliding handle 330 is installed on the outer side of the support body 310. The sliding handle 330 is arranged adjacent to the proximal end of the fixed handle 320. The sliding handle 330 is rotatable on the outer side of the support body 310 and drives the sheath joint 220 to move axially, that is, the rotation of the sliding handle 330 is converted into the axial movement of the sheath joint 220.

[0064] Specifically, a long hole extending axially (not shown in the figure) is provided on the support body 310. An outer body tooth block 340 is sleeved outside the support body 310. The sheath tube joint 220 includes a joint body 222 and an abutting block 221. The joint body 222 includes a distal protrusion 223. A hole is provided on the joint body 222. The abutting block 221 is partially located in the hole. The abutting block 221 and the distal protrusion 223 respectively abut against the proximal end and the distal end of the body tooth block to limit the axial movement of the body tooth block 340 relative to the sheath tube joint 220, that is, the body tooth block 340 is axially located between the abutting block 221 and the distal protrusion 223. An internal thread is provided on the inner side of the sliding handle 330, and an external thread is provided on the outer side of the body tooth block 340. The internal thread is engaged with the external thread. When the sliding handle 330 rotates, the sheath tube joint 220 is driven to move axially via the body tooth block 340, the abutting block 221, and the distal protrusion 223, and then the outer sheath tube 200 is driven to move axially, so that the main body stent 800 can be in a partially released state or a fully released state.

[0065] In this embodiment, the sliding handle 330 can also slide axially on the support body 310, that is, the sliding handle 330 can slide axially relative to the fixed handle 320. In order to maintain the axial position of the sliding handle 330, in this embodiment, a release lock button 321 is embedded in the fixed handle 320. The release lock button 321 extends a hook 322 toward the sliding handle 330. A button support body 323 is provided below the release lock button 321. The button support body 323 is fixed on the support body 310. Positioning posts 324 with opposite positions are respectively provided between the release lock button 321 and the button support body 323. A driving spring is sleeved on the two positioning posts 324. The driving spring is located between the release lock button 321 and the button support body 323 to drive the hook 322 into place. The hook 322 hooks the sliding handle 330 so that the sliding handle 330 is arranged adjacent to the fixed handle 320 and prevents the sliding handle 330 from sliding axially. Specifically, the sliding handle 330 includes a rotating cover 332. The rotating cover 332 is located at the distal end of the sliding handle 330. The rotating cover 332 has an inward flanging 333. The hook 322 can extend into and engage with the inward flanging 333. One side of the inward flanging 333 that engages with the hook 322 can be regarded as an annular positioning groove, that is, the hook 322 is located in the positioning groove, thus restricting the axial position of the hook 322 and allowing the sliding handle 330 to rotate relative to the fixed handle 320. In this embodiment, two concentric drag-reducing convex rings 334 are provided on the rotating cover 332. The drag-reducing convex rings 334 are located on the distal side wall of the rotating cover 332. Through the drag-reducing convex rings 334, the contact between the fixed handle 320 and the sliding handle 330 changes from surface contact to line contact, greatly reducing the contact area between the two, reducing the resistance during their relative movement, and making the release process smoother and more accurate.

[0066] To prevent the released part of the main body stent 800 from fully expanding when the main body stent 800 is in a partially released state, which may cause the released part of the main body stent 800 to closely adhere to the blood vessel (the diameter of the main body stent after full release is generally about 10% larger than the diameter of the blood vessel), resulting in inaccurate release of the main body stent 800 and inability to readjust the position of the main body stent 800. In this embodiment, please refer to Figures 1 - 3 、 Figure 8 , the delivery device includes a stent restraint assembly 400. The stent restraint assembly 400 is configured to prevent the released part of the main body stent 800 from fully expanding when the main body stent 800 is in a partially released state, so as to reduce the outer diameter of the released part of the main body stent 800. Here, the released part of the main body stent 800 refers to the part of the main body stent 800 that is not restricted by the outer sheath 200, that is, the exposed part of the main body stent 800. Here, the ratio of the outer diameter of the released part of the main body stent 800 when it is not fully expanded to the outer diameter of the released part of the main body stent 800 when it is fully expanded is less than or equal to 90%. Thus, since the released part of the main body stent 800 is not fully expanded and has a smaller outer diameter, this part of the main body stent 800 will not closely adhere to the blood vessel. Therefore, when the position of the main body stent 800 is inaccurate during release, for example, when the circumferential alignment of the main body stent 800 is inaccurate, or when the position of the fenestration structure 811 on the main body stent 800 (please refer to Figure 10 ) is inaccurate, there is no resistance when the non-released part of the main body stent 800 fully expands and adheres to the blood vessel. The delivery device can drive the main body stent 800 to move relatively easily, such as rotation or axial movement, so as to facilitate the adjustment of the position of the main body stent 800, such as adjusting the circumferential alignment of the main body stent 800. After the adjustment of the main body stent 800 is in place, the control handle 300 can operate the outer sheath 200 to move axially towards the proximal end, so as to fully release the main body stent 800. At this time, the main body stent 800 fully expands and the main body stent 800 closely adheres to the arterial blood vessel. Thus, it is convenient to adjust the main body stent 800 through the delivery device in this embodiment, which is beneficial to saving the time and effort of the operator. In this embodiment, the stent restraint device can cause the released part of the main body stent 800 to fully expand after the adjustment of the main body stent 800 is in place, or it can also cause the main body stent 800 to fully expand when the main body stent 800 is in a fully released state. In addition, in other embodiments of the present invention, when the axial position of the main body stent is inaccurate, the operator can also adjust the position of the main body stent by operating the delivery device.

[0067] Please continue to refer to Figures 1 - 3 、 Figure 8, in this embodiment, the stent restraint assembly 400 includes at least one control wire 410. Here, the number of control wires 410 can be one, two, or multiple. The material of the control wire 410 can be selected from stainless steel wires. The control wire 410 enters from the proximal end of the delivery gap 210 and extends to the distal end of the delivery gap 210. Please refer to Figure 11 , the covered stent 800 includes a tubular covering 810 and an annular support frame 820. Axially arranged on the tubular covering 810 from the proximal end to the distal end are connecting members 830. At least two rows of the connecting members 830 are circumferentially spaced. Preferably, the proximal end of the connecting member 830 is located at the proximal end of the tubular covering 810, and the distal end of the connecting member 830 is located in the middle of the tubular covering 810. At least one fenestration structure 811 is provided on the tubular covering 810. The fenestration structure 811 is located between the proximal end and the middle of the tubular covering 810. When the covered stent 800 is in a partially released state, at this time, the covering starts to be released from the proximal end to the distal end, but generally does not exceed the middle position of the covering. At this time, the fenestration structure 811 will be located on the released part of the covered stent 800. The control wire 410 binds at least two rows of the connecting members 830 together so that the covered stent 800 is not fully unfolded circumferentially, thereby reducing the outer diameter of the released part of the covered stent 800. Specifically, the outer diameter of the released part of the covered stent 800 is smaller than the blood vessel diameter, which is beneficial for adjusting the position of the covered stent 800, such as adjusting the fenestration structure 811 to face the branch blood vessel. Preferably, the circumferential length between the two rows of connecting members 830 bound by the control wire 410 can reduce the outer diameter of the released part of the covered stent 800 by more than 10%, that is, the ratio of the outer diameter of the released part of the covered stent 800 when not unfolded to the outer diameter of the released part of the covered stent 800 when fully unfolded is less than or equal to 90%.

[0068] In this embodiment, the stent restraint assembly 400 further includes a pull ring 420. The pull ring 420 is fixedly connected to the proximal end of the control wire 410, which is convenient for the operation of the control wire 410 during the operation. Specifically, the staff can apply a force proximally through the pull ring 420 to release the restraint of the control wire 410 on the covered stent 800, thereby completing the release of the restrained part of the covered stent 800.

[0069] In order to increase the safety of the device, in this embodiment, the delivery device further includes another locking assembly 500, which is used to lock the movement of the stent restraining assembly 400 to prevent the misunderstanding of removing the restraint of the control wire 410 on the stent graft 800. In this embodiment, the other locking assembly 500 is used to lock the movement of the pull ring 420 to prevent the misunderstanding of removing the restraint of the control wire 410 on the stent graft 800. In addition, in other embodiments of the present invention, the other locking assembly 500 can also be used to lock the movement of the control wire to prevent the misunderstanding of removing the restraint of the control wire on the stent graft. In this embodiment, another locking assembly 500 includes a pull ring fixing member 510 and a near-release rotary cover 520. The pull ring fixing member 510 is connected to the proximal end of the tail end slide member 650 (described later) by threading. The pull ring fixing member 510 is provided with a through hole for positioning the pull ring 420 and a first groove cooperating with the near-release rotary cover 520. The near-release rotary cover 520 is rotatably installed at the distal end of the pull ring fixing member 510. An L-shaped protrusion is provided at the distal end of the inner side of the near-release rotary cover 520. The long arm of the L-shaped protrusion extends in the circumferential direction, and the short arm of the L-shaped protrusion extends from one end of the long arm toward the distal end in the axial direction. The L-shaped protrusions form a second groove, and a second protrusion extending outward is provided at the distal end of the pull ring 420. After the pull ring 420 is inserted into the through hole and fixed, the proximal release screw cap 520 is rotated to allow the second protrusion to enter the second groove, thereby locking the pull ring 420 in this position. At this time, the pull ring 420 cannot drive the control wire 410 to move in the proximal direction, thereby preventing the film-coated stent 800 from being released due to error. When the proximal release screw cap 520 is rotated to allow the second protrusion to come out of the second groove, the pull ring 420 can be operated to drive the control wire 410 to move in the proximal direction, thereby releasing the film-coated stent 800.

[0070] In this example, see Figures 1 - 3 , Figure 7 The delivery device further comprises a push rod 610 and a support tube 620, wherein the support tube 620 is located between the outer sheath tube 200 and the outer sheath core tube 120, that is, the support tube 620 is at least partially located in the delivery gap 210, and the support tube 620 plays a role in increasing support; the push rod 610 is located between the support tube 620 and the outer sheath core tube 120, and the distal end of the push rod 610 is located in the delivery gap 210, when the control handle 300 controls the outer sheath tube 200 to move axially toward the proximal end relative to the sheath core assembly 100, the distal end of the push rod 610 is used to resist the main support 800 to prevent the main support 800 from moving toward the proximal end of the delivery gap 210, and the push rod 610 also plays a supporting role. In addition, in the present embodiment, the push rod 610 is provided with a plurality of through holes in the axial direction, and the through holes can be used to control the passage of the wire 410 and the pre-buried guide wire 710.

[0071] In this embodiment, the conveying device further includes a push rod fixing member 630 and a tail end fixing member 640. The push rod fixing member 630 is fixedly connected to the proximal ends of the push rod 610 and the support tube 620. The distal end of the push rod fixing member 630 is located inside the proximal end of the support body 310, and the distal end of the push rod fixing member 630 is fixedly connected to the proximal end of the support body 310. The tail end fixing member 640 is sleeved outside the proximal end of the support body 310, and the distal end of the tail end fixing member 640 is fixedly connected to the proximal end of the support body 310. Additionally, the push rod fixing member 630 extends an interface, and this interface is connected to one end of a TPU hose, and the other end of the TPU hose is connected to a three-way valve.

[0072] In this embodiment, the proximal end of the tail end fixing member 640 is fixedly connected to the tail end slide member 650. The distal end of the tail end slide member 650 is located inside the tail end fixing member 640. Inside the tail end slide member 650, there is a sheath core tube fixing member 150. The sheath core tube fixing member 150 is located at an approximate middle position of the tail end slide member 650, and the sheath core tube fixing member 150 is fixedly connected to the outer side of the proximal end of the outer sheath core tube 120. Near the proximal end of the tail end slide member 650, there is an outer cover 680, and the outer cover 680 is sleeved on the tail end slide member 650.

[0073] In this embodiment, please refer to Figures 1 - 3 、 Figure 7 、 Figure 8 , on one side of the proximal end of the tail end slide member 650, there are a sheath core fixing steel sleeve 160 and a rear release rotary cap 170. The sheath core fixing steel sleeve 160 is located inside the tail end slide member 650. The sheath core fixing steel sleeve 160 is fixedly connected to the inner sheath core 110 and is located outside the inner sheath core 110. The rear release rotary cap 170 is located outside one side of the proximal end of the tail end slide member 650. The rear release rotary cap 170 is fixedly connected to the sheath core fixing steel sleeve 160. On one side of the proximal end of the tail end slide member 650, there is an axially extending long hole, and the rear release rotary cap 170 can drive the sheath core fixing steel sleeve 160 to move axially within the range of the long hole, thereby controlling the rear release of the main body bracket 800. In this embodiment, the proximal end of the tail end slide member 650 is fixedly connected to the distal end of the pull ring fixing member 510. In this embodiment, the proximal end of the inner sheath core 110 is fixedly connected to a Luer connector 670.

[0074] Additionally, in this embodiment, please refer to Figure 11, the main body stent 800 includes a tubular film 810 and an annular support frame 820. A connecting member 830 is axially arranged on the tubular film 810 from the proximal end to the distal end, and at least two rows of the connecting members 830 are circumferentially spaced apart. When the main body stent 800 is in a partially released state, the stent binding assembly 400 controls to bind at least two rows of the connecting members 830 together so that the main body stent 800 is not fully unfolded circumferentially. When the main body stent 800 is in a fully released state, the stent binding assembly 400 releases the binding of the connecting member 830 to enable the film stent 800 to be fully unfolded.

[0075] A window structure 811 is provided on the tubular film 810. When the main body stent 800 is in a partially released state, the window structure 811 is located on the tubular film of the released part. The specific structure of the main body stent 800 in this embodiment is described in detail in CN201711483955.7 previously applied by the applicant. The disclosure information of this document is incorporated into this application by reference herein.

[0076] It should be noted that each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple. For the relevant parts, please refer to the description of the method embodiments.

[0077] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A conveying device for conveying a main bracket with a windowing structure, characterized in that, The delivery device includes: A sheath-core assembly; An outer sheath tube, which is hollow and sleeved outside the sheath-core assembly. There is a delivery gap between the outer sheath tube and the sheath-core assembly. The distal end of the delivery gap is used to accommodate the contracted main stent; A pre-embedded guide wire, which enters from the proximal end of the delivery gap and extends to the distal end of the delivery gap. The distal end of the pre-embedded guide wire is used to enter the inner side of the main stent from the outside of the main stent via a fenestration structure. The distal end of the pre-embedded guide wire is positioned inside the main stent. The pre-embedded guide wire is used to guide the branch guide wire to penetrate out from the inner side and be positioned at the fenestration structure of the main stent. A locking assembly is provided on the proximal side of the delivery device. The locking assembly is used to lock the movement of the pre-embedded guide wire; The delivery device further includes a control handle, which is connected to the proximal end of the outer sheath tube. The control handle controls the outer sheath tube to move axially relative to the sheath-core assembly so that the contracted main stent is in a partially released state or a fully released state. A sheath tube joint is fixedly connected to the outside of the outer sheath tube. The control handle includes: A support body, inside which the sheath tube joint is provided. When an axial force is applied to the sheath tube joint, it moves axially in the support body to drive the outer sheath tube to move axially; A fixed handle, which is installed on the outside of the distal end of the support body and is fixedly connected to it; A sliding handle, which is installed on the outside of the support body. The sliding handle is arranged adjacent to the proximal end of the fixed handle. The sliding handle can rotate on the outside of the support body and drive the sheath tube joint to move axially. The sliding handle can slide axially on the support body. A release lock button is embedded on the fixed handle. The release lock button extends a hook towards the sliding handle side. The hook hooks the sliding handle so that the sliding handle is adjacent to the fixed handle and prevents the sliding handle from sliding axially; 2. The conveying device according to claim 1, characterized in that, The delivery device further includes: A tail end fixing piece, which is fixedly connected to the proximal end of the control handle; A tail end sliding track piece, which is fixedly connected to the proximal end of the tail end fixing piece. The locking assembly is provided on the tail end sliding track piece. The pre-embedded guide wire passes through the tail end sliding track piece and the tail end fixing piece and enters the delivery gap; 3. The conveying device according to claim 2, wherein, The tail end sliding track piece includes a hollow tail sliding track, which is communicated with the delivery gap. The locking assembly includes a wire fixing piece, a fixed convex ring fixed on the tail sliding track, and a retaining piece fixed in the tail sliding track. The pre-embedded guide wire enters from the gap between the wire fixing piece and the retaining piece. The wire fixing piece and the fixed convex ring can be movably connected by threads. When the fixing piece presses the pre-embedded guide wire against the convex ring, the movement of the pre-embedded guide wire is locked; 4. The conveying device according to claim 1, wherein, The delivery device further includes a stent restraint assembly, which is used to make the released part of the main stent not fully unfolded to reduce the outer diameter when the main stent is in a partially released state, and to make the main stent fully unfolded when the main stent is in a fully released state; 5. The conveying device according to claim 4, wherein The stent restraint assembly includes at least one control wire, which enters from the proximal end of the delivery gap and extends to the distal end of the delivery gap. The distal end of the control wire is used to circumferentially restrain the released part of the main stent.

6. The conveying device according to claim 5, wherein, The stent restraint assembly further includes a pull ring, which is fixedly connected to the proximal end of the control wire. By applying a force to the proximal end through the pull ring, the restraint of the control wire on the main stent can be released.

7. The conveying device according to claim 4, characterized in that, The delivery device further includes another locking assembly, which is used to lock the movement of the stent restraint assembly to prevent accidental release of the restraint of the control wire on the main stent.

8. The conveying device according to claim 1, characterized in that The support body is provided with a long hole extending axially. The outer side of the support body is sleeved with a main body tooth block. The sheath tube joint includes a joint body and an abutting block. The joint body includes a distal protrusion. The abutting block and the distal protrusion respectively abut against the proximal end and the distal end of the main body tooth block to limit the axial movement of the main body tooth block relative to the sheath tube joint. The inner side of the sliding handle is provided with an internal thread, and the outer side of the main body tooth block is provided with an external thread. The internal thread meshes with the external thread. When the sliding handle rotates, the sheath tube joint is driven to move axially through the main body tooth block, the abutting block and the distal protrusion, and then the outer sheath tube is driven to move axially.

9. The conveying device according to claim 1, wherein, The delivery device further includes a push rod, the distal end of which is located in the delivery gap. When the control handle controls the outer sheath tube to move axially towards the proximal end relative to the sheath core assembly, the push rod is used to abut against the main stent to prevent the main stent from moving towards the proximal end of the delivery gap.

10. The conveying device according to claim 9, characterized in that, The delivery device further includes a support tube, the distal end of which is located in the delivery gap, and the push rod is located inside the support tube.

11. The conveying device according to claim 9, wherein, The push rod is provided with a plurality of through holes axially. The pre-embedded guide wire enters from the proximal end of the through hole and exits from the distal end of the through hole.

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