Covered stent system

Abstract

The invention discloses a covered stent system, which relates to the technical field of interventional medical instruments, and comprises: a conveyor, which comprises an inner tube and an outer tube that can slide relative to each other; the covered stent is of a self-expansion structure arranged on the periphery of the inner tube in a sleeving mode and has a retraction state in which the covered stent is contained in the outer tube and an unfolding state in which the covered stent is unfolded outwards after the outer tube is withdrawn; the covered stent comprises a stent main body section and a stent near-end section; the near-end detachable woven rope sleeve has a binding connection state in which a plurality of slipknots are woven and bound on the peripheries of the inner tube and the near-end section of the stent, and a releasing state in which all the slipknots are released under the pulling of external force and the binding of the near-end section of the stent is released; the stent proximal section maintains connection with the inner tube through the proximal releasable woven sling, and when the proximal releasable woven sling is in the released state, the stent proximal section is separated from the inner tube. According to the covered stent system, the covered stent can be recycled and released for many times to adjust the release position of the covered stent, and the accuracy of the release position of the covered stent is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of interventional medical devices, and in particular to a stent graft system. Background Art

[0002] As for the treatment of vascular lesions, the existing technology is to implant a covered stent at the location of the vascular lesion, use the covered stent to support the inner wall of the blood vessel, block the blood vessel rupture or isolate the blood supply to the inner wall of the hemangioma blood vessel, and establish a new blood flow channel.

[0003] Once the stent graft is manufactured, it needs to be compressed to a smaller size and assembled into a delivery device. This device then delivers the stent graft through the vascular pathway to the desired location and releases it. During delivery, once the stent graft is in the desired location, the outer sheath is slowly withdrawn, allowing the stent graft to expand on its own. The delivery device is then withdrawn, completing the procedure. However, existing stent grafts cannot be retrieved after they are fully deployed. If the stent graft's release location differs from the lesion area, the stent graft's release position cannot be adjusted.

[0004] Therefore, how to develop a delivery system that can recover the released stent graft, adjust the position of the stent graft in the blood vessel, recover or release the stent graft multiple times, and then accurately release the stent graft to the diseased area is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a stent graft system to solve the problem that the existing stent graft cannot be adjusted in position after being released.

[0006] In order to solve the above technical problems, the technical solutions of the present invention are as follows: A stent graft system, comprising: The conveyor comprises an inner tube and an outer tube sleeved on the outer periphery of the inner tube, wherein the outer tube and the inner tube are slidably arranged relative to each other; The stent graft is a self-expanding structure sleeved on the outer periphery of the inner tube, and has a retracted state accommodated in the outer tube and an expanded state in which it is radially expanded outward after the outer tube is withdrawn; the stent graft comprises a stent body segment and a stent proximal segment located proximal to the stent body segment; The proximal end releasable braided rope loop has a restrained connection state in which a plurality of slipknots are woven therein and restrained on the periphery of the inner tube and the proximal end segment of the stent, and an untied release state in which all the slipknots are untied under external pulling and the restraint on the proximal end segment of the stent is released; when the proximal end releasable braided rope loop is in the restrained connection state, the proximal end segment of the stent is kept connected to the inner tube by the proximal end releasable braided rope loop; when the proximal end releasable braided rope loop is in the untied release state, the proximal end segment of the stent can self-expand and unfold, and the proximal end segment of the stent and the inner tube are separated.

[0007] Furthermore, when the proximal releasable braided rope loop is in the restrained connection state and the outer tube is withdrawn from the coated stent, the part of the proximal releasable braided rope loop restrained at the periphery of the proximal segment of the stent can be deformed with the self-expansion of the proximal segment of the stent and maintain the state of restraining the proximal segment of the stent.

[0008] Furthermore, the proximal releasable braided loop is a releasable braided structure in which one or more first binding lines are cross-hooked and connected with each other along a braiding path, and all intersections are slip knots.

[0009] Furthermore, the rope end of the proximal end releasable braided rope loop passes through the outer tube and extends to the proximal end of the conveyor, and the rope end of the proximal end releasable braided rope loop is connected to a first fixing member for pulling the first binding line.

[0010] Furthermore, the coated stent also includes a distal segment of the stent located at the distal end of the stent main body segment, and the coated stent system also includes a distal releasable braided rope loop; the distal releasable braided rope loop has a knotted and bound state in which a plurality of slip knots are woven therein and bound to the periphery of the distal segment of the stent, and an untied and released state in which all the slip knots are untied and the restraint on the proximal segment of the stent is released under external force; when the distal releasable braided rope loop is in the untied and released state, the distal segment of the stent can self-expand and unfold.

[0011] Furthermore, when the distal releasable braided loop is in the knotted and restrained state and the outer tube is withdrawn from the stent graft, the distal releasable braided loop can deform with the self-expansion of the distal end segment of the stent and maintain the state of restraining the distal end segment of the stent.

[0012] Furthermore, the distal end releasable braided loop is a releasable braided structure in which one or more second binding wires are cross-hooked and connected with each other along a braiding path, and all intersections are slip knots.

[0013] Furthermore, the rope end of the distal end releasable braided rope loop passes through the outer tube and extends to the proximal end of the conveyor, and the rope end of the distal end releasable braided rope loop is connected to a second fixing member for pulling the second binding line.

[0014] Furthermore, the outer tube is a multi-lumen tube, and an inner tube lumen and two wiring lumens are provided inside the outer tube. The inner tube lumen is for the inner tube to pass through, one of the wiring lumens is for the first binding wire to pass through, and the other wiring lumen is for the second binding wire to pass through.

[0015] Furthermore, the conveyor also includes a catheter seat fixedly connected to the proximal end of the outer tube, and the catheter seat is provided with a first interface, a second interface and a third interface, the first interface is for the inner tube to pass through, the second interface is for the first binding wire to pass through, and the third interface is for the second binding wire to pass through. The part of the inner tube extending out of the first interface is fixed with an inner tube joint, the part of the first binding wire extending out of the second interface is fixed with a first fixing piece, and the part of the second binding wire extending out of the third interface is fixed with a second fixing piece.

[0016] The technical solution of the present invention has the following advantages: before the stent graft is released, the proximal end section and the inner tube of the stent graft are bound by a proximal releasable braided rope loop woven with multiple slip knots, the stent body section of the stent graft is bound by the outer tube, and the stent graft as a whole is in a retracted state with a smaller outer diameter; after the conveyor delivers the stent graft to the predetermined position through the vascular access, the outer tube is moved proximally, the stent body section of the stent graft is released, and the stent body section expands radially outward after self-expansion, and the proximal end section of the stent is still bound by the proximal releasable braided rope loop, and the proximal end section of the stent has not yet been separated from the inner tube under the constraint of the proximal releasable braided rope loop. At this time, if you want to adjust the release position of the stent graft, The outer tube can be moved distally, and the released stent graft can be recovered to the area between the outer tube and the inner tube. The position of the conveyor can then be adjusted as a whole. After the stent graft is adjusted to the appropriate position, the stent graft is released again until the stent graft is accurately released to the desired position. When the release position of the stent graft no longer needs to be adjusted, the end of the proximal releasable braided loop is pulled, and all the knots in the proximal releasable braided loop are untied in sequence, and the proximal releasable braided loop becomes a loose binding line in an untied and released state. The proximal segment of the stent graft is released, and the proximal segment of the stent graft self-expands and unfolds, separating the proximal segment of the stent graft from the inner tube, completing the release of the entire stent graft. This stent graft system can adjust the release position of the stent graft by recovering the stent graft during the stent graft release process, thereby improving the accuracy of the stent graft release position and facilitating the precise release of the stent graft to the lesion area. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 is a top view of a stent graft system according to an embodiment of the present invention; Figure 2 is a cross-sectional view of a stent graft system according to an embodiment of the present invention; Figure 3This is a schematic diagram of the first stent graft being released from the distal opening of the outer tube in an embodiment of the present invention; Figure 4 This is a schematic diagram of the second stent graft being released from the distal opening of the outer tube in an embodiment of the present invention; Figure 5 Schematic diagram of the structure of the inner tube and the outer tube in an embodiment of the present invention; Figure 6 Schematic diagram of a proximal releasable braided loop being bound to the outer periphery of a stent graft or an inner tube in a bound connection state according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the first step of braiding two first binding wires of the proximal releasable braided loop around the outer circumference of the stent graft or inner tube in an embodiment of the present invention; Figure 8 This is a schematic diagram of the second step of braiding two first binding wires of the proximal releasable braided loop around the outer periphery of the stent graft or the inner tube in an embodiment of the present invention.

[0019] Explanation of the reference numerals: 110, inner tube; 120, outer tube; 130, catheter seat; 131, first interface; 132, second interface; 133, third interface; 140, inner tube joint; 200, coated stent; 210, stent main body section; 220, stent proximal section; 300, proximal detachable braided rope loop; 310, proximal braided rope end; 400, distal detachable braided rope loop; 410, distal braided rope end; 500, first fixing member; 600, second fixing member. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] Throughout the description of this application, it should be understood that the terms "proximal" and "distal" refer to the near and far ends relative to the operator. When in use, the end closest to the physician or operator is the "proximal end," i.e., the end where the operator is located, and the end farther from the physician or operator is the "distal end," i.e., the end where the balloon is located. The aforementioned descriptions of orientations are intended solely for ease of description and simplification of this application, and are not intended to indicate or imply that the device or component referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] In the description of this application, it should be noted that the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediary, or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in the context of the present invention.

[0023] like Figures 1-8 A stent graft system is shown, comprising a conveyor and a stent graft 200. The conveyor comprises an inner tube 110, an outer tube 120, a catheter adapter 130, and an inner tube connector 140. The outer tube 120 is coaxially sleeved around the outer circumference of the inner tube 110, and the outer tube 120 and the inner tube 110 are slidably disposed relative to each other. The catheter adapter 130 is fixedly connected to the proximal end of the outer tube 120, and the inner tube 110 extends through the catheter adapter 130. The inner tube 110 is fixedly connected to the proximal end of the inner tube 110. The outer tube 120 can be moved forward and backward by manipulating the catheter adapter 130, and the inner tube 110 can be moved forward and backward by manipulating the inner tube connector 140. The stent graft 200 is specifically a self-expanding structure sleeved around the outer circumference of the inner tube 110. The stent graft 200 has a retracted state, where it is housed within the outer tube 120, and an expanded state, where it expands radially outward after the outer tube 120 is withdrawn.

[0024] like Figure 1 and Figure 4As shown, in some embodiments, a stent graft 200 includes a stent body 210 and a stent proximal segment 220 located proximal to the stent body 210; the stent body 210 and the stent proximal segment 220 are integrally formed. The stent graft system includes a proximal releasable braided loop 300, which is a knot-free, releasable tubular structure formed by braiding one or more first binding wires. The loop ends of the proximal releasable braided loop 300 pass through the outer tube 120 and extend to the proximal end of the delivery device. A first fixture 500 for pulling the first binding wires is connected to the loop ends of the proximal releasable braided loop 300. The proximal releasable braided loop 300 can be in a restrained state, in which it is braided with multiple slipknots and secured around the inner tube 110 and the stent proximal segment 220, and in a released state, in which all the slipknots are undone by an external force, releasing the restraint on the stent proximal segment 220. When the proximal releasable braided loop 300 is in a restrained connection state, the proximal segment 220 of the stent remains connected to the inner tube 110 via the proximal releasable braided loop 300. When the proximal segment 220 is in a released state, the proximal segment 220 of the stent can self-expand and deploy, and the proximal segment 220 of the stent and the inner tube 110 can separate. When the proximal segment 300 is in a restrained connection state and the outer tube 120 is withdrawn from the stent graft 200, the portion of the proximal segment 220 of the proximal releasable braided loop 300 restrained by the proximal segment 220 can deform as the proximal segment 220 self-expands, maintaining the state of restraining the proximal segment 220.

[0025] Among them, the proximal releasable braided loop 300 does not have any dead knots, and all the braiding intersections are locked by the mutual pressure of the first binding line and the braiding path. Once the rope head 310 at one end of the first binding line is pulled, this force will release each locking point in turn along the braiding path, so that it will disintegrate instantly like a zipper. In some embodiments, the proximal releasable braided loop 300 is woven from a first binding line. During the braiding process, the proximal releasable braided loop 300 allows the first binding line to be centered around the proximal end section 220 of the coated stent 200 to form a series of repeated, symmetrical "8" rings or "U" shaped rings that cross and hook each other. Each newly woven ring in the first binding line is pressed on a specific part of the previous ring, and is also pressed by the next ring, forming a mechanical balance. When the rope head of the first binding line is pulled, the pulling force will be quickly transmitted along this preset braiding path, unlocking each pressure locking point in turn, thereby achieving overall disintegration. In other embodiments, such as Figure 6-Figure 8As shown, the proximal end releasable braided rope loop 300 is braided from two first binding wires, which are named A binding wire 300a and B binding wire 300b. During the braiding process, the A binding wire 300a and the B binding wire 300b are placed side by side. The right binding wire 300b is braided to the left, pressing and picking over the left binding wire 300a and the loop formed by it; then the left binding wire 300a is braided to the right, pressing and picking over the right binding wire 300b and the loop formed by it; this process is alternated left and right, and the proximal end releasable braided rope loop 300 is formed. By pulling the rope ends of the A binding wire 300a and the B binding wire 300b, the proximal end releasable braided rope loop 300 can be quickly untied.

[0026] Before the coated stent 200 is released, the outer tube 120 is located outside the coated stent 200, and the proximal segment 220 of the coated stent 200 and the inner tube 110 are bound and connected together by a proximal releasable braided rope loop 300 woven with multiple slip knots. The stent main body segment 210 of the coated stent 200 is bound by the outer tube 120, and the stent main body segment 210 is in a retracted state with a smaller outer diameter; the proximal releasable braided rope loop 300 applies a radially inward binding force to the proximal segment 220 of the stent, which is equal to the radial expansion force of the proximal segment 220 of the stent itself. The proximal segment 220 of the stent is in a retracted state, and the stent main body segment 210 is also in a retracted state under the constraint of the outer tube 120.

[0027] During the release process of the coated stent 200, after the conveyor delivers the coated stent 200 to the predetermined position through the vascular access, the outer tube 120 is moved proximally, the coated stent 200 is released, and the stent main body section 210 loses the constraint of the outer tube 120 and self-expands and expands radially outward; at this time, the proximal section 220 of the stent is still restrained by the proximal releasable braided rope loop 300, and the proximal section 220 of the stent has not yet been separated from the inner tube 110 under the constraint of the proximal releasable braided rope loop 300. After self-expansion, the stent main section 210 applies a radially outward tension to the stent proximal section 220. Under the self-expansion force of the stent main section 210 and the pulling action of the stent main section 210, the stent proximal section 220 will overcome the restraining force of the proximal releasable braided rope loop 300 and expand radially outward. Since the closer the stent proximal section 220 is to the stent main section 210, the greater the pulling force it is subjected to, the radial expansion of the stent proximal section 220 close to the stent main section 210 is large, and the radial expansion of the stent proximal section 220 away from the stent main section 210 is small. The stent proximal section 220 eventually expands radially into a cone with a small proximal outer diameter and a large distal outer diameter. Since the proximal releasable braided rope loop 300 is a flexible structure, the proximal releasable braided rope loop 300 will also deform into a cone shape as the proximal segment 220 of the stent expands. The conical part of the proximal releasable braided rope loop 300 that is bound to the outer periphery of the proximal segment 220 of the stent still maintains the state of binding the proximal segment 220 of the stent to prevent the proximal segment 220 of the stent from detaching from the inner tube 110.

[0028] When you want to adjust the release position of the coated stent 200, move the catheter seat 130 toward the distal end, driving the outer tube 120 to move toward the distal end. Since the proximal section 220 of the stent is conical and is still bound by the proximal releasable braided rope loop 300, it is convenient to recover the released coated stent 200 to the area between the outer tube 120 and the inner tube 110, and then readjust the position of the conveyor to release the coated stent 200 again until the coated stent 200 is accurately released to the desired position.

[0029] When the release position of the coated stent 200 no longer needs to be adjusted, pull the first fixing piece 500, all the loose knots of the proximal releasable braided rope loop 300 are untied in turn, and the proximal releasable braided rope loop 300 becomes a loose binding line in an untied and released state, the restraint of the proximal segment 220 of the stent is released, the proximal segment 220 of the stent self-expands and unfolds, and the proximal segment 220 of the stent and the inner tube 110 are separated, completing the release of the coated stent 200.

[0030] This coated stent system can adjust the release position of the coated stent 200 by recovering the coated stent 200 during the release process of the coated stent 200, thereby improving the accuracy of the release position of the coated stent 200 and facilitating the accurate release of the coated stent 200 to the diseased area.

[0031] like Figure 2 and Figure 3As shown, in some embodiments, a stent graft 200 includes a stent body 210, a proximal stent segment 220 located proximal to the stent body 210, and a distal stent segment located distal to the stent body 210; the stent body 210, the proximal stent segment 220, and the distal stent segment are integrally formed. The stent graft system includes a proximal releasable braided loop 300 and a distal releasable braided loop 400. The distal releasable braided loop 400 is braided in the same manner as the proximal releasable braided loop 300, except that the distal releasable braided loop 400 is bound to the stent graft 200 at a different location; the distal releasable braided loop 400 is bound to the periphery of the distal stent segment. Similarly, the distal releasable braided loop 400 is a releasable, knot-free braided loop structure formed from one or more second binding threads. The end 410 of the distal releasable braided loop 400 passes through the outer tube 120 and extends to the proximal end of the conveyor. The end of the distal releasable braided loop 400 is connected to a second fixture 600 for pulling the second binding threads. The distal releasable braided loop 400 has a knotted, bound state, in which it is braided with multiple slipknots and bound around the periphery of the stent's distal segment, and an untied, released state, in which, under external force, all slipknots are untied, releasing the stent's proximal segment 220. When the distal releasable braided loop 400 is in the untied, released state, the stent's distal segment can self-expand and deploy. When the distal releasable braided loop 400 is in the knotted, bound state and the outer tube 120 is withdrawn from the stent graft 200, the distal releasable braided loop 400 can deform with the self-expansion of the stent's distal segment and maintain its bounding state. During the process of recovering and releasing the coated stent 200, both ends of the coated stent 200 are bound by a releasable braided rope loop, which facilitates recovering the released coated stent 200 to the area between the outer tube 120 and the inner tube 110.

[0032] like Figure 2 and Figure 3 As shown, in some embodiments, the outer tube 120 is a multi-lumen tube, and the interior of the outer tube 120 is provided with an inner tube lumen and two wiring lumens. The inner tube lumen is for the inner tube 110 to pass through, one of the wiring lumens is for the first binding wire to pass through, and the other wiring lumen is for the second binding wire to pass through. The catheter seat 130 is provided with a first interface 131, a second interface 132 and a third interface 133. The first interface 131 is for the inner tube 110 to pass through, the second interface 132 is for the first binding wire to pass through, and the third interface 133 is for the second binding wire to pass through. The inner tube joint 140 is fixedly connected to the portion of the inner tube 110 extending from the first interface 131. The first fixing member 500 is a first fixing block fixed to the portion of the first binding wire extending from the second interface 132. The second fixing member 600 is a second fixing block fixed to the portion of the second binding wire extending from the third interface 133.

[0033] In the coated stent system provided by the present invention, before the coated stent 200 is released, the two ends of the coated stent 200 are respectively restrained by the proximal releasable braided rope loop 300 and the distal releasable braided rope loop 400, and the stent body section 210 of the coated stent 200 is restrained by the outer tube 120, and the coated stent 200 as a whole is in a retracted state with a smaller outer diameter; after the conveyor delivers the coated stent 200 to the predetermined position through the vascular access, the catheter seat 130 moves proximally, and the catheter seat 130 drives the outer tube 120 to move proximally, and the outer tube 120 and the inner tube 110 move relative to each other, and the stent body section 210 in the middle of the coated stent 200 is released. At this time, the stent body section 210 expands radially outward after self-expansion, and the two ends of the coated stent 200 are still restrained by the releasable braided rope loop, and the coated stent 200 and the inner tube 110 have not yet been separated. The doctor observes whether the release position of the coated stent 200 is appropriate through angiography and other methods. When you want to adjust the position of the coated stent 200, move the catheter seat 130 toward the distal end, thereby driving the outer tube 120 to move toward the distal end, and recover the released coated stent 200 to the area between the outer tube 120 and the inner tube 110, adjust the position of the conveyor, adjust the coated stent 200 to the appropriate position, repeat the above actions, and release the coated stent 200 again. At this time, both ends of the stent graft 200 are still bound by the releasable braided loops. By pulling the first fixing block, the distal releasable braided loop 400 at the distal end of the stent graft 200 is untied, thereby causing the distal end section of the stent graft 200 to self-expand. In this state, if the position of the stent graft 200 is to be readjusted, the above steps can be repeated to retract the stent graft 200 between the outer tube 120 and the inner tube 110. If the position of the stent graft 200 does not need to be adjusted, the proximal releasable braided loop 300 at the proximal end of the stent graft 200 is pulled, thereby causing the proximal end section 220 of the stent graft 200 to self-expand, completing the entire release process of the stent graft 200. This stent graft system adjusts the release position of the stent graft 200 by retracting the stent graft 200 during the release process of the stent graft 200, thereby improving the accuracy of the release position of the stent graft 200 and facilitating the precise release of the stent graft 200 to the lesion area.

[0034] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A stent graft system, characterized in that: include: The conveyor comprises an inner tube (110) and an outer tube (120) sleeved on the outer periphery of the inner tube (110), wherein the outer tube (120) and the inner tube (110) are slidably arranged relative to each other; The stent graft (200) is a self-expanding structure sleeved on the outer periphery of the inner tube (110), and has a retracted state accommodated in the outer tube (120) and an expanded state radially outwardly expanded after the outer tube (120) is withdrawn; the stent graft (200) includes a stent main section (210) and a stent proximal section (220) located at the proximal end of the stent main section (210); The proximal end releasable braided rope loop (300) has a restrained connection state in which a plurality of slipknots are braided and bound to the periphery of the inner tube (110) and the proximal end section (220) of the stent, and an untied release state in which all the slipknots are untied under external pulling and the restraint on the proximal end section (220) of the stent is released; when the proximal end releasable braided rope loop (300) is in the restrained connection state, the proximal end section (220) of the stent is kept connected to the inner tube (110) by the proximal end releasable braided rope loop (300); when the proximal end releasable braided rope loop (300) is in the untied release state, the proximal end section (220) of the stent can self-expand and the proximal end section (220) of the stent is separated from the inner tube (110).

2. The stent graft system according to claim 1, wherein: When the proximal releasable braided rope loop (300) is in the restrained connection state and the outer tube (120) is withdrawn from the coated stent (200), the part of the proximal releasable braided rope loop (300) restrained on the periphery of the proximal end section (220) of the stent can be deformed with the self-expansion of the proximal end section (220) of the stent and maintain the state of restraining the proximal end section (220) of the stent.

3. The stent graft system according to claim 2, wherein: The proximal releasable braided rope loop (300) is a releasable braided structure in which one or more first binding lines are cross-hooked and connected with each other along a braiding path, and all intersections are slip knots.

4. The stent graft system according to claim 3, wherein: The rope end of the proximal end releasable braided rope loop (300) passes through the outer tube (120) and extends to the proximal end of the conveyor. The rope end of the proximal end releasable braided rope loop (300) is connected to a first fixing member (500) for pulling the first binding line.

5. The stent graft system according to any one of claims 1 to 4, characterized in that: The coated stent (200) also includes a stent distal segment located at the distal end of the stent main body segment (210), and the coated stent system also includes a distal releasable braided rope loop (400); the distal releasable braided rope loop (400) has a knotted and bound state in which a plurality of slip knots are woven and bound to the periphery of the stent distal segment, and an untied and released state in which all the slip knots are untied under external force and the restraint on the stent proximal segment (220) is released; when the distal releasable braided rope loop (400) is in the untied and released state, the stent distal segment can self-expand and unfold.

6. The stent graft system according to claim 5, characterized in that: When the distal end releasable braided rope loop (400) is in the knotted and restrained state and the outer tube (120) is withdrawn from the coated stent (200), the distal end releasable braided rope loop (400) can deform with the self-expansion of the distal end segment of the stent and maintain the state of restraining the distal end segment of the stent.

7. The stent graft system according to claim 6, wherein: The distal end releasable braided loop (400) is a releasable braided structure in which one or more second binding lines are cross-hooked and connected to each other along a braiding path, and all intersections are slip knots.

8. The stent graft system according to claim 7, wherein: The rope end of the distal end releasable braided rope loop (400) passes through the outer tube (120) and extends to the proximal end of the conveyor. The rope end of the distal end releasable braided rope loop (400) is connected to a second fixing member (600) for pulling the second binding line.

9. The stent graft system according to claim 5, wherein: The outer tube (120) is a multi-lumen tube, and an inner tube lumen and two routing lumens are provided inside the outer tube (120). The inner tube lumen is for the inner tube (110) to pass through, one of the routing lumens is for the first binding wire to pass through, and the other routing lumen is for the second binding wire to pass through.

10. The stent graft system according to claim 9, wherein: The conveyor also includes a catheter seat (130) fixedly connected to the proximal end of the outer tube (120), and the catheter seat (130) is provided with a first interface (131), a second interface (132) and a third interface (133), the first interface (131) is for the inner tube (110) to pass through, the second interface (132) is for the first binding line to pass through, and the third interface (133) is for the second binding line to pass through, the part of the inner tube (110) extending from the first interface (131) is fixed with an inner tube joint (140), the part of the first binding line extending from the second interface (132) is fixed with a first fixing member (500), and the part of the second binding line extending from the third interface (133) is fixed with a second fixing member (600).

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