Supporting bracket and conveying system

Abstract

The invention provides a support stent and a delivery system, and the support stent is used for providing lumen support at a suture position of an autologous blood vessel and an artificial blood vessel, so that suture-free quick connection of the human blood vessel and the autologous blood vessel is realized by applying a simple suture or a bundling device outside the blood vessel. The supporting stent can be conveyed to the position where an artificial blood vessel and an autologous blood vessel are to be anastomosed and sutured through the conveying system, the conveying system comprises an enveloping part, a balloon body and a clamping part, the supporting stent is accurately and rapidly positioned in a lumen through installation and delivery of the enveloping part and in cooperation with centering positioning of the balloon body, and when the supporting stent is released, the balloon body is clamped in the clamping part. The clamping function of the clamping piece can further ensure the accurate positioning of the stent and ensure the release stability, so that the support stent can be quickly and accurately conveyed to the suturing position of the autologous blood vessel and the artificial blood vessel.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a support bracket and delivery system. Background Technology

[0002] Aortic dissection occurs when a local tear in the intima, under the impact of strong blood flow, causes the intima to gradually peel away and expand, creating a true and false lumen within the artery. According to the Stanford classification, aortic dissection is divided into two types: Type A and Type B. Type A aortic dissection involves an intima tear located in the ascending aorta, aortic arch, or proximal descending aorta, extending to involve the ascending aorta or aortic arch, and may even extend to the descending aorta or even the abdominal aorta. Type B aortic dissection involves an intima tear located in the aortic isthmus, extending only to the descending aorta or reaching the abdominal aorta, but not involving the ascending aorta or aortic arch. Currently, there are two main surgical approaches for treating Type A aortic dissection: traditional open surgery and novel hybrid surgery. In open surgery, the prolonged thoracotomy may affect patient survival and postoperative recovery, and in severe cases, may lead to serious postoperative complications. Therefore, minimizing the surgical time is crucial. Summary of the Invention

[0003] Therefore, it is necessary to provide a support stent and delivery system. The support stent can be quickly and accurately delivered to the position of the stent or autologous blood vessel to be anastomosed and sutured during the operation through the delivery system. The support force of the support stent, together with the ligation device or simple suturing, can achieve rapid and effective anastomosis closure, thereby effectively reducing the operation time.

[0004] A support bracket is provided, comprising a tubular body and a membrane, the membrane at least completely covering the inner surface of the tubular body, wherein the outer diameter of the tubular body at least at one non-end position in the axial direction is less than or equal to the outer diameter at the end positions.

[0005] In one embodiment, the tubular body has a groove at at least one non-end position in the axial direction, and the coating is folded towards the outer surface of the tubular body at at least one end in the axial direction and at least partially covers the outer surface.

[0006] A conveying system includes the aforementioned support bracket and a conveyor. The conveyor includes a handle assembly comprising a movable handle and a fixed handle. A fixed sheath is provided on the proximal side of the fixed handle. The movable handle is connected to a conveying shaft, which passes through the inner cavity of the fixed sheath. The movable handle can control the conveying shaft to slide axially relative to the fixed sheath. A bracket mounting assembly is provided on the proximal side of the conveying shaft. When the conveying shaft moves distally relative to the fixed sheath, the proximal side of the fixed sheath can control the bracket mounting assembly to release the support bracket.

[0007] In one embodiment, the conveying shaft includes a main rod and a sliding rod disposed near the proximal end of the main rod, the sliding rod being axially movable relative to the main rod.

[0008] In one embodiment, the main body rod and the sliding rod are threadedly connected, the sliding rod includes a first limiting component that restricts the circumferential rotation of the sliding rod, the movable handle can control the circumferential rotation of the main body rod and the axial sliding of the sliding rod, and the bracket mounting component is disposed on the proximal side of the sliding rod.

[0009] In one embodiment, the bracket mounting assembly is an envelope comprising a fixing portion and a loading portion. The fixing portion is fixed to the sidewall of the sliding rod, and the loading portion is located on the proximal side of the fixing portion. The proximal end of the loading portion is open and extends toward the proximal end of the conveying shaft and can at least partially cover the support bracket.

[0010] In one embodiment, the proximal end of the sliding rod further includes a balloon body, the balloon body comprising at least a first balloon portion and a second balloon portion, the first balloon portion being located within the inner cavity of the envelope, the maximum expansion diameter of the first balloon portion being equal to the maximum expansion diameter of the envelope; the second balloon portion being located on the proximal side of the first balloon portion, and the maximum expansion diameter of the second balloon portion being greater than the maximum expansion diameter of the first balloon portion.

[0011] In one embodiment, the proximal side of the fixed sheath further includes a clamping member, the clamping member including a connecting portion and a clamping portion disposed on the proximal side of the connecting portion, the connecting portion being connected to the fixed sheath, the clamping portion extending to the proximal end of the sliding rod and surrounding the outer side of the envelope in the circumferential direction; the handle assembly is connected to a movable sheath, the movable sheath being sleeved on the outer side of the fixed sheath and being axially slid relative to the fixed sheath towards the proximal or distal end, thereby causing the clamping portion to retract or expand radially.

[0012] In one embodiment, the maximum closing diameter of the clamping portion is less than or equal to the maximum expansion diameter of the second bladder portion.

[0013] In one embodiment, the outer side wall of the fixed sheath is further provided with a second limiting component, and at least the inner side wall of the movable sheath is provided with a second limiting groove located at the distal end of the second limiting component. When the movable sheath moves towards the proximal end relative to the fixed sheath until the second limiting component locks into the second limiting groove, the movable sheath causes the clamping portion to retract radially.

[0014] In one embodiment, the sidewall of the fixed sheath is provided with a first limiting groove that extends axially and penetrates the inner and outer sidewalls of the fixed sheath, and the first limiting component can slide along the first limiting groove; the first limiting component extends at least partially through the first limiting groove and extends into the cavity between the fixed sheath and the movable sheath, the first limiting groove includes a first position, and the first limiting component can be in the first position to release the locking engagement.

[0015] In one embodiment, the sliding rod includes a second position that separates the envelope from the fixed sheath. When the sliding rod is in the second position, the axial distance between the distal ends of the first limiting component and the distal ends of the second limiting component is greater than or equal to the axial length of the support bracket.

[0016] The beneficial effects of this invention are as follows: Compared with the prior art, this application provides a support stent and a delivery system. The support stent is used to provide lumen support at the suture site between autologous and artificial blood vessels, so as to achieve sutureless and rapid connection between human and autologous blood vessels by applying simple sutures or ligation devices outside the blood vessel. The support stent can be delivered to the position where the artificial and autologous blood vessels are to be anastomosed and sutured through the delivery system. The delivery system includes an envelope, a balloon, and a clamping member. The support stent is delivered by the installation of the envelope and accurately and quickly positioned in the lumen with the central positioning of the balloon. When the support stent is released, the clamping action of the clamping member can further ensure the accurate positioning of the stent while ensuring the stability of the release, thereby realizing the rapid and accurate delivery of the support stent at the suture site between the autologous and artificial blood vessels. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the conveying system structure provided by the present invention;

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

[0019] Figure 3 This is a schematic diagram of the radial cross-sectional structure of the support bracket in Embodiment 1 of the present invention;

[0020] Figure 4 This is a schematic diagram of the support bracket having an annular recessed structure in Embodiment 1 of the present invention;

[0021] Figure 5 This is a schematic diagram of the groove structure of the support bracket in Embodiment 1 of the present invention;

[0022] Figure 6 This is a schematic diagram of the outer structure of the support bracket in Embodiment 1 of the present invention;

[0023] Figure 7 This is a schematic diagram of the cross-sectional structure of the conveyor in Embodiment 2 of the present invention;

[0024] Figure 8 This is a schematic diagram of the cross-sectional structure of the movable handle in Embodiment 2 of the present invention;

[0025] Figure 9 This is a schematic diagram of the envelope mounting support bracket structure in Embodiment 2 of the present invention;

[0026] Figure 10 This is a schematic diagram of the structure in Embodiment 2 of the present invention where the envelope is housed inside the fixed sheath.

[0027] Figure 11 This is a comparison diagram of the maximum expansion diameter of the envelope and the support bracket in Embodiment 2 of the present invention;

[0028] Figure 12 This is a schematic diagram of the envelope component having a tapered structure in Embodiment 2 of the present invention;

[0029] Figure 13 This is a schematic diagram of the structure of the enveloped support bracket in Embodiment 2 of the present invention;

[0030] Figure 14 This is a schematic diagram of the encapsulation structure of the proximal end of the envelope in Embodiment 2 of the present invention;

[0031] Figure 15 For the present invention Figure 14 A magnified view of the encapsulation structure at position B in the middle;

[0032] Figure 16 This is a schematic diagram of the structure in Embodiment 3 of the present invention, in which the proximal end of the sliding rod also includes a balloon body;

[0033] Figure 17 For the present invention Figure 16 A partially enlarged sectional view at position C;

[0034] Figure 18 This is a schematic diagram of the fixed handle structure in Embodiment 4 of the present invention;

[0035] Figure 19 This is a schematic diagram of the fixed sheath structure of the fixed handle in Embodiment 4 of the present invention;

[0036] Figure 20This is a schematic diagram of the movable sheath structure in Embodiment 4 of the present invention;

[0037] Figure 21 This is a schematic diagram of the delivery system structure for delivering the support stent to the blood vessel in Embodiment 4 of the present invention;

[0038] Figure 22 This is a schematic diagram of the conveying system structure when the first limiting component and the second limiting component are in contact, according to Embodiment 4 of the present invention.

[0039] Figure 23 For the present invention Figure 22 A magnified schematic diagram of the structure at position D in the middle;

[0040] Figure 24 This is a schematic diagram of the conveying system structure when the sliding rod is in the second position before the support bracket is released, according to Embodiment 4 of the present invention. Detailed Implementation

[0041] To better understand the concept of this application, the implementation methods of this application will be described in detail below with reference to the accompanying drawings. The following specific embodiments are only some embodiments of this application and are not intended to limit this application.

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

[0043] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0044] To more clearly describe the structure of this application, the terms "proximal" and "distal" are used here as conventional terms in the field of interventional medicine. Specifically, "distal" refers to the end away from the blood vessel during delivery, and "proximal" refers to the end that enters the blood vessel during delivery; "axial" refers to its length direction, and "radial" refers to the direction perpendicular to the "axial" direction; "upper end" and "lower end" are two relatively distant ends, and when one end is defined as "upper end", the other distant end is "lower end".

[0045] In current technology, the treatment of type A aortic dissection mainly employs traditional open surgery. However, the prolonged thoracotomy can negatively impact patient survival and postoperative recovery, and in severe cases, may lead to serious postoperative complications. Therefore, minimizing surgical time is crucial. Furthermore, the suturing of implanted stents and autologous blood vessels during open-chest surgery typically requires considerable time; thus, reducing suturing time can, to some extent, reduce the overall surgical time. Based on this, please refer to [link to relevant medical information]. Figure 1 This application provides a support stent 2 and a delivery system 100. The support stent 2 can provide lumen support at the suture site between the autologous blood vessel and the artificial blood vessel, so as to achieve sutureless and rapid connection between the human blood vessel and the autologous blood vessel by applying simple sutures or ligation devices outside the blood vessel. After the support stent 2 provides support force, it achieves compaction and sealing. During the intervention process, the support stent 2 is delivered to the target position through the delivery system 100 provided in this application, thereby ensuring that the support stent 2 is released stably, accurately and quickly into position to further reduce the operation time.

[0046] Example 1:

[0047] Please see Figure 2 and Figure 3The support stent 2 provided in this application is used to implant the support stent 2 at the position where the intraoperative stent needs to be sutured to the human blood vessel 4 after the stent is inserted into the human body during surgery. The intraoperative stent usually includes an artificial blood vessel part and a main stent part. The main stent is usually used to intervene in the blood vessel 4, while the artificial blood vessel is usually used to replace the excised blood vessel and connect with the preserved blood vessel to establish a vascular access. The purpose of the support stent 2 provided in this application is to provide a sufficiently large support at the position where the artificial blood vessel and the main stent are connected and sutured to the autologous blood vessel 4 after release. It can form a rapid and stable connection between the intraoperative stent and the autologous blood vessel 4 in conjunction with the ligation or simple suture, so as to replace the complete suture method and shorten the operation time. The support stent 2 provided in this application includes a tubular main body 21 and a membrane 22. The support stent 2 is a self-expanding stent. It can be squeezed and compressed when subjected to radial pressure for easy delivery. In its natural state, the support stent 2 is in an elastic expansion state and can resist a certain degree of radial pressure. The tubular main body 21 can be woven into a metal skeleton by braiding wires of metal material, or it can be cut into a tubular metal skeleton with a mesh structure. The membrane 22 of the support stent 2 at least completely covers the inner surface of the tubular body 21. Here, since the support stent 2 is in direct contact with the blood after the stent is implanted during the procedure, the membrane 22 completely covering the inner surface of the tubular body 21 can prevent the tubular body 21 from directly contacting the blood and causing adverse reactions or long-term thrombus accumulation. The outer side of the tubular body 21 is not covered with membrane 22, so that the metal skeleton can directly abut against the inner wall of the stent at the implantation site, increasing the friction and thus increasing the stability of the support stent 2 and the stent during the procedure for a long time.

[0048] In this embodiment, the tubular body 21 has a radial support force that resists compression deformation. In addition to providing a force to support the lumen, the radial support force also provides a force to resist the tightening force when the doctor applies the tying device at the support bracket 2 position, thereby forming a stable connection and anchoring effect with the tying device. Here, the outer side of the tubular body 21 without a membrane 22 can also provide better friction during tying to prevent the tying structure from coming loose.

[0049] In another embodiment, please refer to Figure 4 and Figure 5 To improve the stability of the tying element after tying the stent and support stent 2 during the tying procedure, the tubular body 21 has at least one axially oriented position where the outer diameter is less than or equal to the outer diameter at the two ends. This allows at least one annular recess 23 to be formed circumferentially on the outer surface of the support stent 2. During tying, the tying element can at least partially sink into the recess, thus preventing displacement when the support stent 2 or the stent during the procedure is subjected to blood flushing or other axial forces, further ensuring post-tying stability. In one embodiment, such as... Figure 4 and Figure 5As shown, the annular groove 23 can be located at the middle position in the axial direction of the tubular body 21. When the binding is tied, it can ensure the uniformity of the force at both ends, thereby avoiding the uniform deformation or displacement of the support bracket 2 caused by the force applied by the binding, which would affect the support effect of the support bracket 2 itself.

[0050] The annular recess 23 can be formed by a groove 24 circumferentially provided on the outer surface of the tubular body 21. The groove 24 can be formed by bending a U-shaped groove at the middle position of the tubular body 21, while the other pipe sections in the axial direction are straight pipe sections. Alternatively, the annular recess 23 can be formed by the diameter of the tubular body 21 gradually decreasing from both ends toward the middle position, forming the lowest point at the middle position in the axial direction. Or, the inner diameter of the tubular body 21 can remain unchanged, and only the thickness or wire diameter at the middle position of the outer surface of the tubular body 21 in the axial direction can be made smaller than the thickness or wire diameter at both ends in the axial direction, thereby forming a recess.

[0051] In other embodiments, please refer to Figure 6 Because the length of the support stent 2 provided in this application is relatively short, the exposed tubular body 21 at both ends of the axial direction is prone to generating strong frictional force on the blood vessel 4 due to the strong radial support force of the tubular body 21. In order to avoid damage to the surface of the stent or the blood vessel 4 during the operation by the tubular body 21, the covering membrane 22 completely covers the inner surface of the tubular body 21, while extending towards the outer surface of the tubular body 21 at both ends of the axial direction and at least partially covering the outer surface. In this way, the covering membrane 22 forms an outer wrapping structure 221 from the inner cavity to the outer side at both ends, covering both ends of the covering membrane 22, thereby avoiding direct contact between the ends of the tubular body 21 and the stent or blood vessel 4 during the operation, which would cause structural damage. At the same time, the outer surface of the tubular body 21 that is only partially covered by the covering membrane 22 still has a part that is not covered by the covering membrane 22 to enhance the anchoring with the stent during the operation.

[0052] In one embodiment (not shown in the figure), the covering 22 may also extend towards the outer surface of the tubular body 21 at both ends along the axial direction and completely cover the outer surface of the tubular body 21. This arrangement allows for the sewing of an additional protective layer at each end of the tubular body 21 along the axial direction, further preventing damage to the stent or autologous blood vessel 4 caused by the high radial support force at both ends of the support stent 2 during surgery. Furthermore, to better adapt the support stent 2 to the natural shape of the autologous blood vessel 4, the support stent 2 may have a certain taper along the axial direction, for example, the maximum outer diameter gradually decreases from the proximal end to the distal end of the axial direction.

[0053] Example 2:

[0054] In this embodiment, please refer to Figure 7 and Figure 8This application also provides a delivery system 100, which includes a support bracket 2 as described above and a delivery device 1. The delivery device 1 is used to deliver the support bracket 2 as described in Embodiment 1 during surgery. The delivery device 1 includes a handle assembly 10, which includes a movable handle 101 and a fixed handle 102. The movable handle 101 is axially positioned at the distal end of the fixed handle 102. The support bracket 2 is released from the support bracket during surgery via the movable handle 101. A fixed sheath 1021 is provided at the proximal end of the fixed handle 102, and the fixed sheath 1021 is fixedly connected to the fixed handle 102. Here, the fixed handle... The handle 102 has an axially penetrating inner cavity. The fixed sheath 1021 is fixed to the proximal end of the fixed handle 102 and its lumen is connected to the inner cavity of the fixed handle 102. The movable handle 101 is connected to a conveying shaft 1011 and a control component. The control component can be the outer shell of the movable handle 101 itself, which is directly connected to and controls the conveying shaft 1011. The conveying shaft 1011 passes through the inner cavity of the fixed sheath 1021, and the distal end of the conveying shaft 1011 extends through the inner cavity of the fixed handle 102 to the movable handle 101 and is connected to the movable handle 101, so that the conveying shaft 1011 can move within the fixed handle 102. The movable handle 101 controls the delivery shaft 1011 to slide axially relative to the fixed sheath 1021. The proximal end of the delivery shaft 1011 is provided with a stent mounting assembly, and the support stent 2 is mounted on the stent mounting assembly. The stent 2 is delivered to the intraoperative stent or autologous blood vessel 4 through the delivery device 1. Here, the proximal end of the fixed sheath 1021 and the stent mounting assembly have a cooperating function, so that the fixed sheath 1021 can control the support stent 2 to be released from the stent mounting assembly. Specifically, when the movable handle 101 controls the delivery shaft 1011 to move distally relative to the fixed sheath 1021, the proximal end of the fixed sheath 1021 can control the support stent 2 to be released from the stent mounting assembly.

[0055] In this embodiment, please refer to Figure 8Specifically, the conveyor shaft 1011 includes a main body rod 10111 located at the distal end and a sliding rod 10112 located at the proximal end of the main body rod 10111. The sliding rod 10112 is axially movable relative to the main body rod 10111. Here, the sliding rod 10112 achieves axial sliding through the control of the main body rod 10111. Specifically, the main body rod 10111 and the sliding rod 10112 are threaded together. A bracket mounting assembly is mounted on the proximal sidewall of the sliding rod 10112. The sliding rod 10112 includes a first... The limiting component 1012 restricts the circumferential rotation of the sliding rod 10112. Here, since the main rod 10111 and the sliding rod 10112 are threadedly connected, and the circumferential rotation of the sliding rod 10112 is restricted by the first limiting component 1012, when the movable handle 101 controls the main rod 10111 to rotate circumferentially, the sliding rod 10112 can be controlled to move axially between the proximal and distal ends, so that the sliding rod 10112 can move relative to the proximal end of the fixed sheath 1021.

[0056] In one embodiment, not shown in the figure, the control component may be a knob disposed in the movable handle 101. The knob has a circular structure and the distal end of the main body rod is axially connected to the knob. The knob is at least partially exposed on the outer surface of the movable handle 101 and can rotate relative to the movable handle. The user can control the rotation of the main body rod 10111 by rotating the knob with any finger while holding the movable handle, thereby controlling the sliding rod 10112 threadedly connected to the main body rod 10111 to slide axially.

[0057] In another embodiment (not shown in the figure), the main rod 10111 and the sliding rod 10112 can be fixedly connected. After connection, the main rod 10111 and the movable handle 101 can be movably connected along the axial direction. The outer shell of the movable handle 101 has a groove extending along the axial direction. The control component can be a sliding button. The sliding button is located in the groove, and at least one side extends into the inner cavity of the movable handle 101 and connects to the main rod 1011. The other side protrudes from the groove and is exposed on the outside of the movable handle 101 for human hand to press and drag along the groove. In this way, the user can control the conveying shaft 1011 to slide along the axial direction by dragging the sliding button, thereby controlling the support bracket 2 to slowly detach from the proximal end of the membrane and release it under the pressure of the fixed sheath 1021 until the support bracket 2 is completely detached from the membrane and the release of the support bracket 2 is completed.

[0058] In this embodiment, this application also provides a support release structure formed by a combination of a fixed sheath 1021, a delivery shaft 1011, and an envelope 20. Please refer to [link to relevant documentation]. Figure 7 and Figure 9The stent mounting assembly of this application includes a flexible envelope 20, specifically a membrane. The membrane can be a PET film or a polyester fabric. The membrane at least partially covers the compressed support stent 2, which is mounted on the proximal end of the delivery device 1. During delivery, the support stent 2 is compressed and installed within the membrane. When the delivery device 1 delivers the support stent 2 to the implantation site of the intraoperative stent or autologous blood vessel 4, rotating the movable handle 101 causes the main rod 10111 to drive the sliding rod 10112 along... The sliding rod 10112 slides axially towards the distal end. When it slides to the proximal end of the fixed sheath 1021 and abuts against and squeezes the membrane, the sliding rod 10112 continues to slide distally. Under the compression of the fixed sheath 1021, the support bracket 2 slowly detaches from the proximal end of the membrane and is released until the support bracket 2 is completely detached from the membrane. After release, the envelope 20 can be folded and stored in the inner cavity of the fixed sheath 1021, thereby preventing the loosened envelope 20 after compression from being hooked by the support bracket 2 and affecting the release of the support bracket 2. Therefore, please refer to further... Figure 10 The maximum diameter D5 of the folded envelope 20 can be less than or equal to the inner diameter D6 of the fixed sheath 1021, thereby ensuring that the envelope 20 can be completely contained within the fixed sheath 1021 to avoid affecting the smoothness and stability of the release. Here, the maximum diameter of the folded envelope 20 should be less than the inner diameter of the fixed sheath 1021, which can further reduce the area of ​​release between the envelope 20 and the fixed sheath 1021, thereby effectively reducing friction and reducing release resistance, which is more conducive to the release of the support bracket 2.

[0059] Please refer to Figure 9The capsule includes a fixing portion 202 and a loading portion 201. The fixing portion 202 is used to fix the capsule to the side wall of the sliding rod 10112 near the proximal end. The loading portion 201 is connected to the fixing portion 202 and is located on the proximal side of the fixing portion 202. It extends towards the proximal end of the sliding rod 10112 to form an opening. The support stent 2 is installed in the capsule through the opening of the loading portion 201 and is released from the opening upon release. In order to ensure that the stent can be stably installed in the capsule in a compressed state, the maximum expansion diameter D1 of the envelope 20 is set to be smaller than the maximum expansion diameter D2 of the support stent 2. With this setting, the support stent 2 installed in the capsule is always in a compressed state due to the limitation of the maximum expansion diameter D1 of the capsule, thereby ensuring that the stent is always delivered in a compressed state to the intraoperative stent or autologous blood vessel 4. In one embodiment, to ensure better delivery of the stent 2, the maximum expansion diameter D1 of the capsule is less than or equal to 80% of the maximum expansion diameter D2 of the stent 2, thereby ensuring that the stent 2 is delivered with at least 20% of its diameter compressed. This ensures sufficient compression, thereby ensuring smooth delivery and reducing surgical time. It also avoids spending too much time adjusting the stent's delivery posture due to the stent's excessive volume during delivery.

[0060] In one embodiment, the loading portion 201 has a cylindrical body that adapts to the tubular structure of the support stent 2, thereby ensuring that the support stent 2 is installed tightly against the inner wall of the envelope 20. Furthermore, the cylindrical body is evenly distributed circumferentially around the delivery shaft 1011. This arrangement ensures that when the support stent 2 is installed in the loading portion 201 of the envelope 20, after the envelope 20 is tensioned, the support stent 2 is essentially evenly distributed circumferentially around the delivery shaft 1011, forming a centrally located structure. Since the axial length of the support stent 2 in this application is relatively short, uneven release and misalignment could lead to a tilted structure within the blood vessel 4 after release, resulting in surgical failure. The centrally located structure allows for more accurate and uniform release of the support stent 2. Uniform release ensures that the support stent 2 is properly released within the blood vessel 4 to form a supporting structure, avoiding misalignment after release due to uneven release.

[0061] In another embodiment, please refer to Figure 12 The envelope 20 may have a diameter D3 at least at the proximal end of the loading portion 201 that is less than or equal to the diameter D4 at the distal end, or it may have a tapered structure in its axial direction. Specifically, the diameter of the portion of the membrane covering the support bracket 2 gradually decreases from the distal end to the proximal end, forming an envelope structure with a tapered structure. With this configuration, the tightness of the membrane at the proximal end of the support bracket 2 is greater than that at the distal end, thereby ensuring a stable installation of the support bracket 2 while preventing the support bracket 2 from slipping off the opening of the proximal loading portion 201.

[0062] In this embodiment, please refer to Figure 13 The loading portion 201 of the capsule covers at least three-quarters of the axial length of the support stent 2. This length meets the minimum requirement for stably enveloping and fixing the support stent 2. At the same time, the support stent 2 is partially exposed from the proximal end of the capsule, and the three-quarters length of the capsule can provide sufficient tightening and support forces. With the cooperation of the retrieval structure, the support stent 2 will not be dislodged. In addition, the partially exposed support stent 2 can reduce the release force required when the stent is released, and the release length is shorter, thereby reducing the release time and achieving the effect of reducing the operation time.

[0063] In one embodiment (not shown in the figure), the membrane is elastic, providing a certain elastic contraction when covering the support bracket 2 to further secure the installation and fixation of the support bracket 2, preventing the bracket from slipping off from the opening of the loading part 201. Thus, the maximum diameter of the membrane at its elastic tensile limit should be set smaller than the maximum diameter of the support bracket 2, thereby ensuring the elastic membrane effectively envelops the support bracket 2. Here, the fixing part 202 of the membrane is used to connect with the sliding rod 10112. The loading part 201 is located near the loading part 201 and is used to install and cover the support bracket 2. The membrane may only be elastic in the loading part 201, while the fixing part 202 is not elastic. This configuration ensures that the fixing sheath 1021 does not elastically stretch when the membrane is squeezed out of the support bracket 2, thus directly compressing the support bracket 2 and ensuring the accuracy of the support bracket 2's release position and the time required for release.

[0064] In this embodiment, both the fixed portion 202 and the loading portion 201 of the envelope 20 may be elastic. Here, the elastic fixed portion 202 should be in a tensioned state when the loading portion 201 is equipped with a bracket. The tensioned state means that the fixed portion 202 is in the elastic tensile limit state. In this way, the excess elasticity of the fixed portion 202 can also be avoided so that the fixed sheath 1021 will be elastically stretched first when the membrane is squeezed out and the support bracket 2 is released, which would affect the accuracy of the release position and the time required for release.

[0065] In other embodiments, please refer to Figure 14 and Figure 15 In order to further prevent the support bracket 2 from slipping off the opening of the proximal loading part 201, after the film completely covers the support bracket 2, the loading part 201 is folded and extended toward the inner cavity of the support bracket 2 to form a wrapping structure 203 for the proximal end, thereby forming a blocking effect on the proximal end of the support bracket 2, and further preventing the support bracket 2 from slipping off the opening of the proximal loading part 201.

[0066] Example 3:

[0067] In this embodiment, please refer to Figure 16 and Figure 17 The structure of the support stent 2 and the delivery device 1 is largely the same as in Embodiments 1 and 2. The difference is that, when the support stent 2 is installed near the proximal end of the delivery device 1, the tightening force of the membrane causes it to revolve around the sliding rod 10112 as an axis, forming a centrally positioned structure. Since the axial length of the support stent 2 in this application is relatively short, uneven release or misalignment could result in the stent forming a tilted structure within the blood vessel 4, leading to surgical failure. The centrally positioned structure allows for more accurate and uniform release of the support stent 2. Uniform release ensures that the support stent 2 is properly released within the blood vessel 4 to form a supporting structure, avoiding misalignment of the stent after release due to uneven release. In this embodiment, to ensure the centered structure of the stent before and after release, the proximal end of the sliding rod 10112 also includes a balloon body 3. The balloon body 3 is at least partially located within the inner cavity of the supporting stent 2, and the diameter of the balloon body 3 after inflation is equal to or greater than the maximum expansion diameter of the capsule. Thus, the centered shape of the stent relative to the sliding rod 10112 is ensured by the support of the balloon body 3. Furthermore, the balloon body 3 includes at least a first balloon portion 31 and a second balloon portion 32. The first balloon portion 31 is located within the inner cavity of the capsule of the supporting stent 2, and the maximum expansion diameter D7 of the first balloon portion 31 is equal to the maximum expansion diameter D1 of the capsule. The second balloon portion 32 is located near the proximal end of the first balloon portion 31, and the maximum expansion diameter D8 of the second balloon portion 32 is greater than the maximum expansion diameter D7 of the first balloon portion 31. Here, the first balloon 31 is used to fill the inner cavity of the stent 2 during compression delivery to provide a supporting force to center it, while the diameter D8 of the second balloon 32 is larger than the diameter D7 of the first balloon 31. When the balloon 3 is inflated, the second balloon 32 fits against the inner wall of the intraoperative stent or the inner wall of the autologous blood vessel 4, so that after the delivery device 1 delivers the stent 2 to the intraoperative stent or the autologous blood vessel 4 and before release, the second balloon 32 stabilizes it in the inner cavity and the first balloon 31 ensures that it is in a centered state, thereby further ensuring the uniformity and stability of the stent 2 during release. At the same time, the second balloon 32 can prevent unnecessary displacement of the stent 2.

[0068] In this embodiment, the balloon body 3 can be connected to the inner cavity of the balloon body 3 and the external infusion component through the built-in pipeline of the delivery shaft 1011. The external infusion component inflates the balloon body 3 by delivering an inflation medium, wherein the inflation medium of the infusion component can be gas or liquid.

[0069] Example 4:

[0070] In this embodiment, please refer to Figure 18 and Figure 19The structure of the support bracket 2 and the conveyor 1 is largely the same as that in embodiments one through three. The difference is that, in order to ensure that the support bracket 2 of this application has a stable release position and structure during release, the conveyor 1 further includes a clamping member 1023 and a movable sheath 1022. The handle assembly 10 is connected to the movable sheath, so that the movable sheath 1022 and the fixed handle 102 are movably connected and can slide axially. The clamping member 1023 includes a connecting portion 10232 and a clamping portion 10231 located on the proximal side of the connecting portion 10232. The connecting portion 10232 and the... The sidewall of the fixed sheath 1021 is connected, and the clamping portion 10231 extends to the proximal end of the sliding rod 10112. Multiple clamping portions 10231 may be provided and circumferentially surround the membrane. The clamping portions 10231 are elastic; when subjected to radial pressure, the multiple clamping portions 10231 retract towards the axial direction to form a clamping structure. The movable sheath 1022 is sleeved on the outside of the fixed sheath 1021 and can slide axially relative to the fixed sheath 1021 towards the proximal or distal end, thereby causing the clamping portions 10231 to retract towards or away from the membrane. Specifically, the clamping portion 10231 includes an outwardly expanding section near the distal end and a pressing section located near the proximal end. The outwardly expanding section forms an inclined structure that gradually expands outward from the connecting portion 10232 towards the pressing section. The pressing section is connected to the outwardly expanding section and forms a straight structure parallel to the sliding rod 10112. Here, when the movable sheath 1022 slides proximally to the position of the outward expansion of the clamping section 10231, the proximal end of the sliding sheath abuts against and squeezes the outward expansion. As it continues to slide proximally, the outward expansion is squeezed and retracts towards the axis, thereby causing the compression section to retract towards the axis until it contacts and clamps the outer surface of the intraoperative stent or autologous blood vessel 4. This, together with the balloon 3 located in the lumen of the intraoperative stent or autologous blood vessel 4, forms a clamping structure for the intraoperative stent or autologous blood vessel 4. This ensures that the support stent 2 is fixed in position relative to the intraoperative stent or autologous blood vessel 4 before release and is centered in the space within the lumen, thus forming a good release state to ensure the accuracy of the position and the correctness of the stent posture after release.

[0071] In this embodiment, please refer to Figure 19 , Figure 20 and Figure 21Before the support stent 2 is fully released into the intraoperative stent or autologous blood vessel 4, it is desirable for it to always remain in a suitable release position and a stable spatial position. Therefore, before full release, the clamping member 1023 needs to always maintain the clamping state of the intraoperative stent or autologous blood vessel 4. Thus, the outer wall of the fixed sheath 1021 is also provided with a second limiting component 10211, and at least the inner wall of the movable sheath 1022 is provided with a second limiting groove 10221. The second limiting groove 10221 should be located on the distal side of the second limiting component 10211 in the axial direction, so as to ensure that there is always a position where the second limiting component 10211 and the second limiting groove 10221 coincide during the movement of the movable sheath 1022 towards the proximal end, so as to lock the fit.

[0072] Here, as the movable sheath 1022 moves proximally relative to the fixed sheath 1021 until the second limiting component 10211 locks into the second limiting groove 10221 to restrict the axial sliding of the movable sheath 1022, the movable sheath 1022 allows the clamping portion 10231 to gradually retract towards the capsule until it locks into place. Here, the axial sliding of the movable sheath 1022 is restricted by the cooperation of the second limiting component and the second limiting groove 10221. When the second limiting groove 10221 moves proximally to engage with the second limiting component, the distal end of the movable sheath 1022 is in a state where the compressed outward expansion section presses against the outer surface of the intraoperative stent or autologous blood vessel 4. Here, to ensure that the clamping part 10231 can cooperate with the balloon body 3 to form sufficient clamping force, the maximum closing diameter of the clamping part 10231 is less than or equal to the maximum expansion diameter of the second balloon part 32. Thus, after the clamping part 10231 is clamped to the outer surface of the intraoperative stent or autologous blood vessel 4, due to the supporting force of the second balloon part 32, it cannot continue to close, transforming into its own elastic deformation to provide better clamping force. Specifically, when the clamping part 10231 is in its naturally expanded state, its inner diameter should be at least greater than the maximum expansion diameter of the supporting stent 2 and the maximum expansion diameter of the second balloon body, and further, it should be greater than the outer diameter of the intraoperative stent or autologous blood vessel 4, thereby ensuring sufficient internal space to surround the periphery of the delivery site before clamping.

[0073] In other embodiments, the clamping part 10231 includes an inner surface facing the balloon body 3 and an outer surface away from the balloon body 3. The inner surface has a plurality of anti-slip blocks. The purpose of providing a plurality of anti-slip blocks is to form an uneven and rough surface on the inner surface, thereby increasing the surface roughness of the clamping part 10231. This increases the friction when clamping the outer surface of the autologous blood vessel 4, thereby ensuring the stability of the clamping part 10231 and preventing random sliding during the clamping process, which could lead to instability in the stent installation position during the operation.

[0074] Furthermore, the anti-slip block can have any shape, such as regular shapes like circles, squares, or triangles, or it can have an irregular shape structure. Specifically, the anti-slip block can have serrated protrusions formed on its inner surface, and the tips of the serrated protrusions are inclined towards the distal end, thereby ensuring that the tips are anchored to the surface of the autologous blood vessel 4 when clamped.

[0075] Furthermore, the clamping part 10231 can be tilted towards the balloon body 3 from the distal end to the proximal end to form an inclined clamping part, thereby providing a greater clamping force to ensure the stability of clamping during clamping.

[0076] In one embodiment, please continue reading Figure 19 After the support stent 2 is fully released, the delivery device 1 needs to be withdrawn from the intraoperative stent or autologous blood vessel 4. Therefore, the clamping part 10231 needs to release its clamping effect on the intraoperative stent or autologous blood vessel 4. Thus, the side wall of the fixed sheath 1021 of this application is also provided with a first limiting groove 10212 extending axially and penetrating the inner and outer walls of the fixed sheath 1021. The first limiting component 1012 can slide along the first limiting groove 10212. The first limiting groove 10212 has an axial length, and its circumferential width is the same as the circumferential width of the first limiting member, thereby restricting the circumferential rotation of the first limiting member and allowing it to slide only along the axial length of the groove. The first limiting component 1012 at least partially extends through the first limiting groove 10212 and extends into the cavity between the fixed sheath 1021 and the movable sheath 1022. When sliding axially, the first limiting component 1012 moves within this cavity. Please refer to... Figure 22 and Figure 23 The first limiting groove 10212 includes a first position, where the first limiting component 1012 can be in the first position to release the locking engagement. Here, the second limiting component 10211 extends from the side wall of the fixed sheath 1021, from the inner cavity formed by the fixed sheath 1021 and the movable sheath 1022, to the inner side wall of the movable sheath 1022, and locks into the first limiting groove 10212. The second limiting component 10211 is elastic and disengages from the second limiting groove 10221 to release the locking engagement when force is applied. The first limiting groove 10212 and the second limiting component 10211 have the same circumferential position and different axial positions. The first position is when the first limiting component 1012 is axially locked into the second limiting groove 10212. When the first limiting component 1012 continues to slide distally from the first position, the second limiting component 10211 is squeezed by the first limiting component 1012 and disengages from the second limiting groove 10221, making the movable sheath 1022 movable. At this time, due to the elasticity of the clamping part 10231, the rebound of the clamping part 10231 causes the outward expansion section to push the movable sheath 1022 distally, and the clamping part 10231 releases the clamping effect on the intraoperative stent or autologous blood vessel 4.

[0077] In another embodiment, please refer to Figure 24 Since the sliding rod 10112 can release the support stent 2 from the capsule by sliding distally, it can also release the locking engagement between the first limiting component 1012 and the second limiting component 10211 and the second limiting groove 10221, thereby releasing the clamping action of the clamping member 1023. In order to save surgical time, it is desirable that the clamping part 10231 releases its clamping action after the stent is fully released. In this embodiment, the sliding rod 10112 includes a second position in which the envelope 20 is separated from the fixed sheath 1021 before the support stent 2 is released. When the sliding rod 10112 is in the second position, the second limiting component 10211 and the second limiting groove 10221 are locked together. When the limiting groove 10221 is in a locked state, and the axial distance L1 between the distal end of the first limiting component 1012 and the distal end of the second limiting component 10211 is equal to the axial length L2 of the support bracket 2, the first limiting component 1012 can slide to contact and squeeze the second limiting component 10211 to release its locking engagement with the second limiting groove 10221. When the clamping member 1023 releases its clamping action, it ensures that the bracket is completely released from the capsule. The two actions of the delivery device 1 are performed in sequence, which can reduce the complexity of medical staff operating the delivery device 1 multiple times, thereby further reducing the operation time.

[0078] In other embodiments, please continue to refer to Figure 24 Here, the distal end of the first limiting component 1012 is used to contact and abut against the second limiting component 10211. When the distal end of the first limiting component 1012 abuts against the distal end of the second limiting component 10211, it can ensure that the second limiting component 10211 is disengaged from the second limiting groove 10221. Therefore, the axial distance L1 between the distal ends of the first limiting component 1012 and the distal ends of the second limiting component 10211 is greater than the axial length L2 of the support stent 2. In this way, when the stent has been completely disengaged from the capsule and released, there is still a certain distance between the first limiting component 1012 and the second limiting component 10211. The clamping action of the clamping member 1023 is maintained, which can resist part of the instantaneous elastic force at the moment of release of the support stent 2, thereby reducing the damage to the intraoperative stent or autologous blood vessel 4 at the moment of release of the support stent 2, and also ensuring the correct release posture of the stent. To further release the clamping effect of the clamping member 1023, the user needs to continue operating the movable handle 101 to slide the first limiting component 1012 to contact and squeeze the second limiting component 10211 to release its locking engagement with the second limiting groove 10221, thereby releasing the clamping effect of the clamping member 1023.

[0079] In this embodiment, the distal end of the movable sheath 1022 is located inside the fixed handle 102, and an operating part is connected to the distal end of the movable sheath 1022. A sliding groove is provided on the side wall of the fixed handle 102, and the operating part extends out of the outer side wall of the fixed handle 102 through the sliding groove, allowing the user to manually operate the axis of the movable sheath 1022 to slide. Here, before the conveyor 1 conveys the support bracket 2, the clamping member 1023 should be in an expanded state, and at this time, the second limiting member and the second limiting groove 10221 are separated. The second limiting groove 10221 should be located on the distal side of the second limiting member. The second limiting groove 10221 is moved to lock with the second limiting member by manually controlling the movable sheath 1022.

[0080] The following is in conjunction with the appendix Figures 21-24 The working principle of the support bracket 2 and the conveyor 1 provided in this application will be introduced as follows:

[0081] Please see Figure 21 Taking the delivery of the support stent 2 to the intraoperative stent as an example, before delivery, the support stent 2 needs to be installed inside the membrane. First, the sliding rod 10112 is slid through the movable handle 101 until the membrane is completely exposed near the fixed sheath 1021. After compressing the support stent 2 to at least 80% of its normal size, it is wrapped and fixed by the membrane, ensuring that the membrane is in a tightened state while aligning the axis of the support stent 2 with the sliding rod 10112, so that the support stent 2 is in a centered state. At this time, the clamp 1023 should be in a naturally expanded state to facilitate the installation of the stent. After installation, the proximal end of the delivery device 1 is delivered to the target position of the intraoperative stent, so that the support stent 2 reaches the target position. At the same time, the clamp 1023 covers the periphery of the intraoperative stent at the target position, and the intraoperative stent is located between the support stent 2 and the clamp 1023.

[0082] Next, please refer to Figure 24 The balloon body 3 is filled with a filling medium through the infusion device, so that the first balloon 31 fills the inner cavity of the support stent 2 and the second balloon 32 fills the side wall of the intraoperative stent. The double-layer support of the balloon body 3 fixes the position of the support stent 2 in the inner cavity of the intraoperative stent and stabilizes its central position. Then, the user manually operates the movable part of the movable sheath 1022 to move the movable sheath 1022 towards the proximal end, so that the second limiting groove 10221 moves to lock with the second limiting member. At this time, the pressing section of the clamping member 1023 presses on the outer side wall of the intraoperative stent and covers the position of the second balloon 32, and clamps the intraoperative stent with the second balloon 32. At this time, the delivery device 1 is clamped with the intraoperative stent and is in a fixed state, completing the preparation work before the release of the support stent 2.

[0083] Next, begin the release procedure for support bracket 2. Please refer to [link / reference]. Figure 23The user holds the fixed handle 102 and rotates the movable handle 101 to slide the sliding rod 10112 to the distal end. The fixed sheath 1021 squeezes the membrane, pushing the support bracket 2 out of the membrane and releasing it. After the support bracket 2 is fully released, due to the resistance and squeezing action of the first limiting component 1012 against the second limiting component 10211, the second limiting component 10211 disengages from the second limiting groove 10221 and releases the locking engagement. The clamping member 1023 pushes the movable sheath 1022 to the distal end due to its own elasticity, and the clamping member 1023 returns to its natural expansion state. At the same time, due to the complete release of the support bracket 2, the pressure stabilization state of the balloon body 3 is destroyed, and the balloon body 3 becomes deflated. It can pass through and be retrieved from the inner cavity of the released support bracket 2. Here, the balloon body 3 can also be deflated by operating the infusion device to withdraw part of the filling medium.

[0084] Finally, the delivery device 1 is removed, and the outer wall of the intraoperative stent or autologous blood vessel 4 is simply sutured or tied to the supporting stent 2 to complete the rapid sutureless closure of the anastomosis.

[0085] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A support stand, characterized by, The tube body has an outer diameter at least at one non-end position in the axial direction which is smaller than or equal to the outer diameter at the end positions.

2. The support bracket of claim 1, wherein The tube body is provided with a groove at least at one non-end position in the axial direction, and the coating is folded towards the outer surface of the tube body at least at one end in the axial direction of the tube body and at least partially covers the outer surface.

3. A delivery system comprising a support stand as claimed in claim 1 or 2, characterized in that The handle assembly comprises a movable handle and a fixed handle, and the proximal end of the fixed handle is provided with a fixed sheath; the movable handle is connected with a delivery shaft which is arranged in the inner cavity of the fixed sheath; the movable handle comprises a control assembly which can control the delivery shaft to slide axially relative to the fixed sheath; the proximal end of the delivery shaft is provided with a stent mounting assembly, and the proximal end of the fixed sheath can control the stent mounting assembly to release the support stent when the delivery shaft moves distally relative to the fixed sheath.

4. The delivery system of claim 3, wherein, The delivery shaft comprises a main rod and a sliding rod arranged at the proximal end of the main rod, and the sliding rod can move axially relative to the main rod.

5. The delivery system of claim 4, wherein, The main rod and the sliding rod are threadedly connected, the sliding rod comprises a first limiting assembly which limits the circumferential rotation of the sliding rod, the movable handle can control the main rod to rotate circumferentially and make the sliding rod slide axially, and the stent mounting assembly is arranged at the proximal end of the sliding rod.

6. The delivery system of claim 5, wherein, The stent mounting assembly comprises an envelope which comprises a fixed part and a loading part, the fixed part is fixed to the side wall of the sliding rod, the loading part is located at the proximal end of the fixed part, the proximal end of the loading part is in the form of an opening, and extends towards the proximal end of the delivery shaft and can at least partially wrap the support stent.

7. The delivery system of claim 6, wherein, The proximal end of the sliding rod further comprises a balloon body which comprises at least a first balloon part and a second balloon part, the first balloon part is located in the inner cavity of the envelope, and the maximum expansion diameter of the first balloon part is equal to the maximum expansion diameter of the envelope; the second balloon part is located at the proximal end of the first balloon part, and the maximum expansion diameter of the second balloon part is greater than the maximum expansion diameter of the first balloon part.

8. The delivery system of claim 7, wherein, The proximal end of the fixed sheath further comprises a clamping piece which comprises a connecting part and a clamping part arranged at the proximal end of the connecting part, the connecting part is connected with the fixed sheath, the clamping part extends to the proximal end of the sliding rod and circumferentially surrounds the outer side of the envelope; the handle assembly is connected with a movable sheath which is arranged outside the fixed sheath and can slide axially relative to the fixed sheath towards the proximal end or the distal end so as to make the clamping part contract or expand radially.

9. The delivery system of claim 8, wherein, The maximum contraction diameter of the clamping part is smaller than or equal to the maximum expansion diameter of the second balloon part.

10. The delivery system of claim 8, wherein, The clamping part comprises an inner surface on one side close to the balloon body, and the inner surface is provided with a plurality of anti-skid blocks which protrude from the inner surface.

11. The delivery system of claim 8, wherein, The outer side wall of the fixed sheath is further provided with a second limiting assembly, at least the inner side wall of the movable sheath is provided with a second limiting slot located at the distal end of the second limiting member, when the movable sheath moves proximally relative to the fixed sheath to the second limiting assembly and the second limiting slot are locked, the movable sheath makes the clamping part contract radially.

12. The delivery system of claim 11, wherein, The side wall of the fixed sheath is provided with a first limiting slot extending along the axial direction and penetrating the inner and outer side walls of the fixed sheath, the first limiting assembly can slide along the first limiting slot; the first limiting assembly extends at least partially through the first limiting slot and extends to the inner cavity between the fixed sheath and the movable sheath, the first limiting slot comprises a first position, the first limiting assembly can be in the first position to release the locked cooperation.

13. The delivery system of claim 12, wherein, The sliding rod comprises a second position for separating the envelope member from the fixed sheath, when the sliding rod is in the second position, the axial interval distance between the distal end of the first limiting assembly and the distal end of the second limiting assembly is greater than or equal to the axial length of the support bracket.

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