A stent system

Abstract

The present application relates to a stent system, comprising a delivery device, a covered stent and a bare coil, the delivery device comprising a guide head and an inner core tube, the inner core tube distal end connected with the guide head proximal end, the covered stent sleeved on the inner core tube, the stent system comprising a release member, the covered stent distal end connected with the bare coil proximal end through the release member, the bare coil distal end fixed on the guide head proximal end, when the release member is separated from the bare coil and the covered stent, the covered stent is separated from the bare coil. The release member can make the bare coil and the covered stent separate when it is recycled. Further, the covered stent is released at the lesion site, and the bare coil is withdrawn together with the inner core tube. Further, it can avoid the bare coil covering the branch blood vessels to affect the blood flow of the branch blood vessels. It can also avoid the situation that the anchoring length of the covered stent covering membrane segment is not enough in order to avoid the bare coil covering the branch blood vessels.

Description

Technical Field

[0001] This invention relates to the field of interventional medicine, and more specifically to a stent system. Background Technology

[0002] In recent years, interventional therapy has become a growing trend in the treatment of cardiovascular diseases. With the continuous development of interventional techniques, the advantages of using endovascular stent grafts (ECLs) to treat aortic aneurysms and aortic dissections have become increasingly prominent. An ECL is an artificial blood vessel adapted to the size of the blood vessel. It mainly consists of a lining and a supporting metal coil. The lining is generally made of polyester or e-PTFE membrane, and the metal coil is mainly woven from nickel-titanium alloy wire. When an ECL is delivered to the lesion site using a delivery system, the stent is first compressed into the inner core of the delivery system. Then, the blood vessel is punctured, and a guidewire is used to establish a track, guiding the delivery system to the designated location of the lesion. The stent is then released, unfolding and adhering tightly to the aneurysm wall. The lining of the stent isolates blood flow from the lesion site, eliminating the impact of blood flow on the aneurysm wall and re-establishing normal blood circulation. Finally, the guidewire and delivery system are withdrawn, thus achieving interventional treatment for aneurysms and aortic dissections.

[0003] Existing stent systems often include an integrated bare-faced coil at the proximal end of the stent. However, this design presents several problems. For example, when the vascular anchoring zone is short, the presence of a bare-faced coil may lead to insufficient anchoring length of the stent graft to prevent it from covering branch vessels, potentially causing endoleak. Conversely, to ensure sufficient anchoring of the graft in the normal vascular area, the bare-faced coil may cover branch vessels, affecting blood flow in those vessels. Summary of the Invention

[0004] To overcome the problems existing in the prior art, the present invention provides a support system.

[0005] The present invention provides a stent system, including a delivery device, a covered stent, and a bare waveguide. The delivery device includes a guide head and an inner core tube. The distal end of the inner core tube is connected to the proximal end of the guide head. The covered stent is sleeved on the inner core tube. The stent system includes a release element. The distal end of the covered stent is connected to the proximal end of the bare waveguide through the release element. The distal end of the bare waveguide is connected to the proximal end of the guide head. When the release element disengages from the bare waveguide and the covered stent, the covered stent separates from the bare waveguide.

[0006] In some embodiments of the present invention, the release member includes a flexible linear structure that passes through the covered support and the bare waveguide to achieve the connection between the covered support and the bare waveguide.

[0007] In some embodiments of the present invention, the proximal end of the bare wave loop includes multiple bare wave loop troughs, and the distal end of the covered stent includes multiple stent peaks. The multiple bare wave loop troughs and the multiple stent peaks correspond one-to-one and overlap to form multiple connection areas, and the release member passes through the multiple connection areas in sequence.

[0008] In some embodiments of the present invention, one end of the release member extends through the interior of the conveyor to the proximal end of the conveyor, and the other end of the release member extends sequentially from the inner / outer surface of the covered support through a connection area to the outer / inner surface of the covered support, and then extends into the covered support from the adjacent connection area, with the other end of the release member protruding from the conveyor.

[0009] In some embodiments of the invention, the support system further includes a retrieval component connected to the proximal end of the bare wave coil.

[0010] In some embodiments of the present invention, the recovery component includes a flexible linear structure, the near end of the bare wave loop includes a plurality of bare wave loop valleys, the recovery component is connected to one of the bare wave loop valleys and sequentially connected to adjacent bare wave loop valleys.

[0011] In some embodiments of the present invention, the recovery component includes a flexible linear structure, the proximal end of the bare waveband includes multiple bare waveband valleys, and a through hole is provided at the position of the bare waveband valley on the bare waveband, or a through hole is provided on the bare waveband near the position of the bare waveband valley, and the recovery component is connected to the proximal end of the bare waveband in sequence through multiple through holes.

[0012] In some embodiments of the present invention, the proximal end of the conveyor further includes a first fixing device, the first fixing device including a first fixing part and a first movable part, the first fixing part being fixedly disposed on the conveyor, the first movable part being movably connected to the first fixing part, and one end of the release member being connected to the first movable part.

[0013] In some embodiments of the present invention, the proximal end of the conveyor further includes a second fixing device, the second fixing device including a second fixing part and a second movable part, the second fixing part being fixedly disposed on the conveyor, the second movable part being movably connected to the second fixing part, and both ends of the recovery component being connected to the first movable part.

[0014] In some embodiments of the present invention, the conveyor further includes a push tube sleeved on the inner core tube, the push tube having a first cavity and a second cavity along its length, at least one end of the release member passing through the first cavity, one end of the release member being connected to the first fixing device, and both ends of the recovery member passing through the second cavity and being connected to the second fixing device.

[0015] Compared with the prior art, the support system of the present invention has the following advantages:

[0016] The stent system provided by this invention includes a delivery device, a covered stent, a release element, and a bare wave coil. Upon retrieval of the release element, the bare wave coil and the covered stent can be disengaged. This allows the covered stent to be released at the lesion site, while the bare wave coil retracts along with the inner core tube. This prevents the bare wave coil from covering branch vessels and affecting their blood flow. It also solves the problem of insufficient anchorage length of the covered stent graft segment in order to prevent the bare wave coil from covering branch vessels. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the support system provided in an embodiment of the present invention.

[0018] Figure 2 This is an enlarged structural schematic diagram of the distal end of a support system provided in an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of bare wave loops covering branch vessels provided in another embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram illustrating a case where the anchoring length of the film-coated support provided in another embodiment of the present invention is insufficient.

[0021] Figure 5 This is a schematic diagram of the structure of the covered stent, bare wave coil and release element of the stent system provided in an embodiment of the present invention.

[0022] Figure 6 This is a radial cross-sectional structural diagram of the covered stent, bare wave coil, and release element of the stent system provided in an embodiment of the present invention.

[0023] Figure 7 This is a schematic diagram illustrating the use of a recyclable component of a support system provided in an embodiment of the present invention.

[0024] Figure 8 This is a schematic diagram of the connection structure between the recovery component and the bare wave coil of the support system provided in an embodiment of the present invention.

[0025] Figure 9 This is a schematic diagram of the initial state of the recovery component and bare wave coil of the support system provided in an embodiment of the present invention.

[0026] Figure 10 This is a schematic diagram of the retractable component and bare wave coil contraction state of a support system provided in an embodiment of the present invention.

[0027] Figure 11 This is another structural schematic diagram of the support system provided in one embodiment of the present invention.

[0028] Figure 12 This is a cross-sectional structural diagram of the push tube, release component, and retrieval component of a support system provided in an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached drawings: 100, support system; 1, conveyor; 2, film-coated support; 3, bare wave coil; 4, release element; 5, retrieval element; 11, guide head; 12, inner core tube; 13, first fixing device; 14, second fixing device; 15, push tube; 16, sheath tube; 20, connecting area; 21, main support; 22, film coating; 31, bare wave coil trough; 131, first fixing part; 132, first movable part; 141, second fixing part; 142, second movable part; 151, first cavity; 152, second cavity; 211, support peak. Detailed Implementation

[0030] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0031] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0032] 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.

[0033] 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.

[0034] In the field of interventional medical devices, "distal" is defined as the end furthest from the operator during surgery, and "proximal" is defined as the end closest to the operator during surgery. "Axial" refers to the direction parallel to the line connecting the center of the distal and proximal ends of the medical device, and "radial" refers to the direction perpendicular to the aforementioned axial direction.

[0035] Please see Figure 1 and Figure 2This invention provides a stent system 100, which includes a delivery device 1, a covered stent 2, and a bare wave coil 3. The delivery device 1 delivers the covered stent 2 to the lesion site. The bare wave coil 3 is connected to the covered stent 2 and increases the anchoring force of the covered stent 2, allowing it to better act on the lesion site. Specifically, the delivery device 1 includes a guide head 11 and an inner core tube 12. The distal end of the inner core tube 12 is connected to the proximal end of the guide head 11, and the covered stent 2 is sleeved on the inner core tube 12. The stent system 100 also includes a release member 4. The distal end of the covered stent 2 is connected to the proximal end of the bare wave coil 3 via the release member 4, and the distal end of the bare wave coil 3 is fixed to the proximal end of the guide head 11. The release member 4 can detach from the bare wave coil 3 and the covered stent 2. When the release member 4 detaches from the bare wave coil 3 and the covered stent 2, the covered stent 2 separates from the bare wave coil 3. The stent system 100 provided by this invention has a bare wave coil 3 whose distal end is connected to the proximal end of the guide head 11, thus fixing the distal end of the bare wave coil 3 to the guide head 11. The distal end of the covered stent 2 is also connected to the proximal end of the bare wave coil 3, thereby fixing the distal end of the covered stent 2. This prevents displacement of the covered stent 2 during release due to its fixed distal end. Simultaneously, the bare wave coil 3 increases the anchoring force of the covered stent 2, allowing it to better target the lesion site. When the covered stent 2 reaches the lesion site, the release member 4 disengages from the bare wave coil 3 and the covered stent 2. This releases the covered stent 2 to the lesion site, while the bare wave coil 3 retracts along with the inner core tube 12. This prevents the bare wave coil 3 from covering branch vessels and affecting blood flow in those vessels (e.g., Figure 3 (As shown). This can also solve the problem of insufficient anchoring length of the covered stent 2's covered segment in order to avoid the bare wave coil 3 covering branch vessels (e.g. Figure 4 (As shown).

[0036] Please see Figure 5The release element 4 is a flexible linear structure that passes through the covered support 2 and the bare wave coil 3 to connect the covered support 2 and the bare wave coil 3. In a specific embodiment of the invention, the proximal end of the bare wave coil 3 includes multiple bare wave coil troughs 31. The covered support 2 includes a main support 21 and a cover 22, with the main support 21 disposed on the inner surface of the cover 22. The distal end of the main support 21 includes multiple support peaks 211. The multiple bare wave coil troughs 31 enter the covered support 2 and correspond one-to-one with the multiple support peaks 211, overlapping to form multiple connection areas 20. Each connection area 20 is a closed, hole-like structure. The release element 4 passes through the multiple connection areas 20 sequentially, that is, the release element 4 simultaneously passes through the bare wave coil troughs 31 and the support peaks 211. After passing through the bare wave coil troughs 31, the release element 4 can restrict the movement of the bare wave coil 3 to the distal end. After the release member 4 passes through the crest 211 of the stent, it can restrict the proximal movement of the covered stent 2. This restricts the covered stent 2 from moving away from the bare wave coil 3, thereby achieving the connection between the covered stent 2 and the bare wave coil 3.

[0037] Please see Figure 6 The connection between the release member 4 and the film support 2 and the bare wave coil 3 is specifically as follows: one end of the release member 4 extends through the interior of the conveyor 1 to the proximal end of the conveyor 1, and the other end of the release member 4 passes through a connection area 20 inside the film support 2, and then passes through the film 22 to the outer surface of the film 22. Subsequently, the release member 4 enters from the outer surface of the film 22 to the inner surface of the film 22 at the position corresponding to the film 22 in the adjacent connection area 20, and then enters the adjacent connection area 20, and so on, until the release member 4 passes through the last connection area 20. The other end of the release member 4 can be located at any position inside the conveyor 1, or it can extend through the interior of the conveyor 1 to the proximal end of the conveyor 1, or it can be exposed outside the conveyor 1. When it is necessary for the release member 4 to detach from the film support 2 and the bare wave coil 3, the end of the release member 4 located at the proximal end of the conveyor 1 is pulled, so that the other end of the release member 4 detaches from the connection area 20 one by one. This causes the coated support 2 to lose connection with the bare waveguide 3, allowing them to separate. This connection method enables the release element 4 to quickly detach from the coated support 2 and the bare waveguide 3, preventing the release element 4 from getting tangled during the detachment process, and also facilitating the user's removal of the release element 4.

[0038] Please see Figure 7After the bare wave coil 3 separates from the coated support 2, the bare wave coil 3 needs to be retrieved. Therefore, the support system 100 also includes a retrieval component 5, which is connected to the proximal end of the bare wave coil 3. In a specific embodiment of the present invention, the retrieval component 5 is a flexible linear structure. One end of the retrieval component 5 extends through the interior of the conveyor 1 to the proximal end of the conveyor 1, and the other end of the retrieval component 5 approaches a bare wave coil 3 and passes out from inside the bare wave coil 3 to the outside on the trough 31 of the bare wave coil, then connects to the adjacent trough 31 of the bare wave coil and passes in from the outside to the inside on the adjacent trough 31, and so on, until the last trough 31 of the bare wave coil is connected to the retrieval component 5 (e.g., Figure 8 (As shown), then the other end of the recovery component 5 extends through the interior of the conveyor 1 to the proximal end of the conveyor 1. This allows the recovery component 5 to be fixedly connected to the bare wave coil trough 31. Please refer to... Figures 9-10 When retrieving the bare wave coil 3, both ends of the retrieval component 5 are simultaneously pulled, causing the wave troughs 31 of the bare wave coil to come together, thereby forming a contracted state for easy retrieval. Subsequently, the inner core tube 12 and the guide head 11 are retracted, allowing the bare wave coil 3 to follow the inner core tube 12 and the guide head 11 away from the lesion site.

[0039] In other specific embodiments of the present invention, the connection between the recovery component 5 and the bare wave coil 3 can also be as follows: one end of the recovery component 5 extends through the interior of the conveyor 1 to the proximal end of the conveyor 1, and the other end of the recovery component 5 approaches a bare wave coil 3 and wraps around it once in the axial direction of the bare wave coil 3 in the wave trough 31. Then, it connects to an adjacent bare wave coil wave trough 31 and wraps around it once in the axial direction of the bare wave coil 3 in the adjacent wave trough 31, and so on, until the last bare wave coil wave trough 31 is connected to the recovery component 5. Further, the above-mentioned connection method of wrapping around the bare wave coil wave 31 once in the axial direction of the bare wave coil 3 can also be replaced by knotting on the bare wave coil wave trough 31.

[0040] The recovery component 5 can also be knotted on the valley 31 of the bare wave coil to secure the connection between the recovery component 5 and the bare wave coil 3.

[0041] As some modified embodiments, through holes can be provided at the location of the bare waveband 31 on the bare waveband 3, or at a location near the bare waveband 31 on the bare waveband 3. The recovery component 5 is sequentially connected to the proximal end of the bare waveband 3 through multiple through holes. Alternatively, after the recovery component 5 passes through the through holes, it can be knotted to the bare waveband 3 to further secure the connection between the recovery component 5 and the bare waveband 3.

[0042] Please see Figure 11 The conveyor 1 also includes a first fixing device 13 near its proximal end, which facilitates the user pulling the release member 4. The first fixing device 13 includes a first fixing part 131 and a first movable part 132. The first fixing part 131 is fixedly mounted on the conveyor 1. The first movable part 132 is movably connected to the first fixing part 131. One end of the release member 4 is connected to the first movable part 132, and the other end of the release member 4 is a free end, which can be positioned anywhere on the conveyor 1. In a specific embodiment of the invention, the first fixing part 131 and the first movable part 132 are threadedly connected. When the first fixing part 131 and the first movable part 132 are locked, the position of the first movable part 132 is fixed, and the release member 4 is fixed. When it is necessary for the release member 4 to disengage from the film-covered support 2 and the bare wave ring 3, the first movable part 132 is rotated, causing the first movable part 132 to lose connection with the first fixing part 131. This allows the first movable part 132 to move relative to the first fixing part 131. Then, the first movable part 132 is pulled, moving it proximally, which in turn pulls one end of the release member 4 proximally. After the first movable part 132 is pulled a certain distance, the other end of the release member 4 disengages from the covered support 2 and the bare wave coil 3. This achieves separation between the covered support 2 and the bare wave coil 3.

[0043] In other specific embodiments of the present invention, the free end of the release member 4 may also extend to the position of the first movable part 132 and protrude from the first movable part 132. To ensure a tight connection between the film-coated support 2 and the bare wave coil 3, and to prevent loosening of the connection between the release member 4 and the film-coated support 2 and the bare wave coil 3, the user can pull the first movable part 132 and one end of the release member 4 exposed on the first movable part 132 to tightly connect the film-coated support 2 and the bare wave coil 3. When it is necessary to release the release member 4, the free end of the release member 4 can be loosened, the first movable part 132 can be pulled, and one end of the release member 4 can be pulled to move it, thereby separating the film-coated support 2 from the bare wave coil 3. Alternatively, the free end of the release member 4 can also be connected to the first movable part 132. In use, the first movable part 132 is separated from the first fixing part 131, thereby exposing both ends of the release member 4 to the conveyor 1. At this point, one end of the release member 4 can be disconnected from the first movable part 132 by cutting or other means, and then the first movable part 132 can be pulled to release the release member 4. The connection between the first fixing part 131 and the first movable part 132 can also be a magnetic connection, a snap-fit ​​connection, etc.

[0044] Please continue reading. Figure 11 The conveyor 1 also includes a second fixing device 14 at its proximal end. The second fixing device 14 facilitates the user pulling the recycling component 5. In a specific embodiment of the invention, to avoid interference between the first fixing device 13 and the second fixing device 14, the first fixing device 13 and the second fixing device 14 are positioned opposite each other at the proximal end of the conveyor 1. In other specific embodiments of the invention, the positions of the first fixing device 13 and the second fixing device 14 can be adaptively set according to actual usage requirements. The second fixing device 14 includes a second fixing part 141 and a second movable part 142. The second fixing part 141 is fixedly mounted on the conveyor 1. The second movable part 142 is movably connected to the second fixing part 141, and both ends of the recycling component 5 are connected to the second movable part 142.

[0045] In a specific embodiment of the invention, the second fixing part 141 and the second movable part 142 are threadedly connected. When the second fixing part 141 and the second movable part 142 are locked together, the recovery member 5 is fixed. When it is necessary to recover the bare wave coil 3, the second movable part 142 is rotated, causing the second movable part 142 to lose connection with the second fixing part 141. This allows the second movable part 142 to move relative to the second fixing part 141. Subsequently, the second movable part 142 is pulled, causing it to move towards the proximal end, thereby pulling both ends of the recovery member 5 to gradually bring the bare wave coil troughs 31 closer together. After pulling the second movable part 142 a certain distance, the recovery member 5 is compressed to a contracted state, preparing for the next step of retracting the recovery member 5.

[0046] In other specific embodiments of the present invention, the connection between the second fixed part 141 and the second movable part 142 may also be a magnetic connection, a snap-fit ​​connection, etc.

[0047] Please combine Figures 10-12 The delivery device 1 further includes a push tube 15 and a sheath 16. The push tube 15 is sleeved on the inner core tube 12. The push tube 15 can move along the axial direction of the inner core tube 12, pushing the release of the membrane-covered support 2. The sheath 16 is sleeved on the push tube 15, and the sheath 16 can move along the axial direction of the push tube 15. When retrieving the bare wave coil 3, the inner core tube 12 is retracted, thereby driving the bare wave coil 3 back into the sheath 16 and storing it inside the sheath 16.

[0048] In a specific embodiment of the present invention, the push tube 15 has a first cavity 151 and a second cavity 152 along its length, that is, the first cavity 151 and the second cavity 152 extend from the proximal end of the push tube 15 to the distal end of the push tube 15. The first cavity 151 and the second cavity 152 are respectively located close to the first fixing device 13 and the second fixing device 14. The proximal end of the release member 4 passes through the first cavity 151 and connects to the first fixing device 13, and the proximal end of the retrieval member 5 passes through the second cavity 152 and connects to the second fixing device 14. The first cavity 151 and the second cavity 152 provide separate connection channels for the release member 4 and the retrieval member 5, respectively, to avoid the release member 4 and the retrieval member 5 from becoming entangled or knotted, thereby preventing the covered support 2 from being unable to be released and the bare wave coil 3 from being unable to be retrieved.

[0049] In other specific embodiments of the present invention, the first cavity 151 and the second cavity 152 may be adaptively configured according to the specific positions of the first fixing device 13 and the second fixing device 14. Alternatively, the positions of the first cavity 151 and the second cavity 152 may be adaptively configured according to the internal structure requirements of the conveyor 1.

[0050] Compared with the prior art, the support system of the present invention has the following advantages:

[0051] 1. The stent system provided by this invention includes a delivery device, a covered stent, a release element, and a bare wave coil. When the release element is retrieved, the bare wave coil and the covered stent can be detached. This allows the covered stent to be released at the lesion site, while the bare wave coil retracts along with the inner core tube. This prevents the bare wave coil from covering branch vessels and affecting their blood flow. It also solves the problem of insufficient anchoring length of the covered stent graft segment in order to avoid the bare wave coil covering branch vessels.

[0052] 2. The connection method between the release element, the covered bracket, and the bare waveband allows the release element to quickly detach from the covered bracket and the bare waveband, avoiding tangling of the release element during the detachment process. It also facilitates the user's removal of the release element and improves the user experience.

[0053] 3. The retrieval component allows the bare wave coil to retract, preventing damage to the inner wall of the blood vessel. The bare wave coil retracts along with the inner core tube, thus achieving retrieval.

[0054] 4. The first fixing device is located at the proximal end of the conveyor, and the release member can be detached through the first fixing device. This facilitates the user in detaching the release member from the film-coated support and the bare wave coil, improving the user experience.

[0055] 5. The second fixing device is located at the near end of the conveyor, and the recovery component can be moved towards the near end via the second fixing device, thereby causing the bare wave coil to retract. This facilitates the user's recovery of the bare wave coil and improves the user experience.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stent system comprising a delivery unit, a covered stent, and a bare wave coil, wherein the delivery unit includes a guide head and an inner core tube, the distal end of the inner core tube being connected to the proximal end of the guide head, and the covered stent being sleeved on the inner core tube, characterized in that: The stent system includes a release element. The distal end of the covered stent is connected to the proximal end of the bare wave coil via the release element. The distal end of the bare wave coil is connected to the proximal end of the guide head. When the release element disengages from the bare wave coil and the covered stent, the covered stent separates from the bare wave coil. The separated bare wave coil retracts along with the inner core tube.

2. The support system as described in claim 1, characterized in that: The release element includes a flexible linear structure that passes through the covered support and the bare waveband to achieve the connection between the covered support and the bare waveband.

3. The support system as described in claim 2, characterized in that: The proximal end of the bare wave loop includes multiple bare wave loop troughs, and the distal end of the covered stent includes multiple stent peaks. The multiple bare wave loop troughs and the multiple stent peaks correspond one-to-one and overlap to form multiple connection areas. The release member passes through the multiple connection areas in sequence.

4. The support system as described in claim 3, characterized in that: One end of the release member extends through the interior of the conveyor to the proximal end of the conveyor; the other end of the release member passes sequentially from the inner / outer surface of the covered support through a connection area to the outer / inner surface of the covered support, and then passes through the adjacent connection area into the covered support to connect the covered support and the bare waveguide. After the covered support and the bare waveguide are connected, the other end of the release member is exposed from the conveyor.

5. The support system as described in claim 1, characterized in that: The support system also includes a recovery component, which is connected to the proximal end of the bare wave coil.

6. The support system as described in claim 5, characterized in that: The recovery component includes a flexible linear structure, and the near end of the bare wave loop includes multiple bare wave loop valleys. The recovery component is connected to one of the bare wave loop valleys and sequentially connected to adjacent bare wave loop valleys.

7. The support system as described in claim 5, characterized in that: The recovery component includes a flexible linear structure. The near end of the bare wave coil includes multiple bare wave coil troughs. A through hole is provided at the position of the bare wave coil trough on the bare wave coil, or a through hole is provided on the bare wave coil near the position of the bare wave coil trough. The recovery component is connected to the near end of the bare wave coil in sequence through multiple through holes.

8. The support system as described in claim 5, characterized in that: The near end of the conveyor also includes a first fixing device, which includes a first fixing part and a first movable part. The first fixing part is fixedly disposed on the conveyor, and the first movable part is movably connected to the first fixing part. One end of the release member is connected to the first movable part.

9. The support system as described in claim 8, characterized in that: The near end of the conveyor also includes a second fixing device, which includes a second fixing part and a second movable part. The second fixing part is fixedly disposed on the conveyor, and the second movable part is movably connected to the second fixing part. Both ends of the recovery component are connected to the first movable part.

10. The support system as described in claim 9, characterized in that: The conveyor also includes a push tube, which is sleeved on the inner core tube. The push tube has a first cavity and a second cavity along its length. At least one end of the release member passes through the first cavity, and one end of the release member is connected to the first fixing device. Both ends of the recovery member pass through the second cavity and are connected to the second fixing device.

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