253 results about "Covered stent" patented technology

The invention relates to a covered stent and a stent system.The covered stent comprises a main stent body and a wrapping piece, the main stent body comprises a main corrugated ring and a main covering film, the main corrugated ring is covered with the main covering film, the wrapping piece is connected with the main stent body through a binding wire, the main stent body comprises a binding piece, and the binding piece is connected with the main stent body through a connecting wire. The binding piece comprises a part of the main body wave ring or comprises a binding line, the binding piece extends along the main body covering film, the main body covering film comprises a first through hole and a second through hole, and the first through hole and the second through hole are formed in the two sides of the extending direction of the binding piece respectively; and the binding wire passes through the first through hole and the second through hole and crosses the binding piece. The binding wire of the covered stent provided by the invention crosses the binding piece when penetrating through the main body covering film, when the covered stent is loaded or released, although the covering film and the main body covering film are pulled and stressed by the binding wire, the binding wire mainly pulls the binding piece, and when the binding wire is stressed, the possibility that film holes of the first through hole and the second through hole are expanded can be reduced, so that internal leakage is prevented.

Covered stents may be coated with or otherwise include a drug eluting composition. An illustrative stent may comprise an elongated tubular body having a strut framework defining a plurality of open cells. A polymeric coating may be disposed on a surface of the elongated tubular body and extending across the plurality of open cells and a first drug coating composition disposed on a surface of the polymeric coating.

The invention provides a covered stent windowing device which comprises a sheathing canal, the sheathing canal comprises an adjustable bending section and a main body section, the adjustable bending section is arranged at the far end of the main body section, and a side hole is formed in the side wall, close to the adjustable bending section, of the far end of the main body section; the puncture assembly is arranged in the sheath tube and extends in the axis direction of the sheath tube; in a working state, at least part of the far end of the puncture assembly penetrates out of the side hole, and a window is formed in the covered stent. According to the scheme, various problems caused by the fact that the puncture assembly stretches out of the far-end port of the sheathing canal to conduct windowing operation are effectively avoided, the windowing position of the puncture assembly on the covered stent can be accurately positioned, the windowing position precision and the windowing success rate are improved, the use difficulty of an operator is reduced, and the windowing operation process does not need to be repeatedly adjusted.

The invention relates to an intracavity implantation system which comprises an intracavity prosthesis, the intracavity prosthesis has a radial expansion state and a radial contraction state, the intracavity prosthesis comprises a covered stent, a valve prosthesis and a flexible connecting pipe, the covered stent is of a tubular structure and comprises a main body section and a reducing section which are communicated with each other, and the valve prosthesis is arranged in the main body section. The main body section and the reducing section are arranged in the axial direction of the covered stent, the cross section area of the near end of the reducing section is smaller than that of the far end of the reducing section, the covered stent is further provided with a window penetrating through the side wall of the covered stent, and at least part of the area of the window is located in the reducing section; the valve prosthesis comprises a valve support and an artificial valve leaflet connected to the interior of the valve support. The flexible connecting pipe is of a tubular structure defined by a flexible film, the far end of the flexible connecting pipe is connected with the reducing section, the near end of the flexible connecting pipe is connected with the valve prosthesis, and the two axial ends of the flexible connecting pipe are communicated with the covered stent and the valve prosthesis respectively. In the implanting process of the endoluminal prosthesis, the relative position of the valve prosthesis and the covered stent can be adjusted according to the lumen structure, and the endoluminal prosthesis can better adapt to various lumen structures. In addition, due to the arrangement of the flexible connecting pipe, the risk that the far end of the valve prosthesis is driven to expand and deform due to expansion of the covered stent can be reduced, force generated in the expansion process of the valve prosthesis is not prone to being transmitted to the covered stent, and therefore the risk that coronary blood flow is blocked due to expansion of the near end of the covered stent can be reduced.

The invention relates to a stent system which comprises a tubular stent, a conveyor, a first stay wire and a second stay wire, the stent comprises a covered stent and a bare stent, the bare stent is arranged at the far end of the covered stent, one end of the first stay wire is connected with the conveyor, and the other end of the first stay wire penetrates out of the conveyor; the first stay wire extends in the circumferential direction of the bare stent after passing through the covered stent and is detachably connected with the bare stent, and the first stay wire moves to drive the bare stent to retract or expand; one end of the second wire drawing wire is connected with the near end side of the conveyor, the other end of the second wire drawing wire penetrates out of the conveyor, the covered stent extends in the circumferential direction of the far end of the covered stent and is detachably connected with the covered stent, and the movement of the second wire drawing wire can drive part of the covered stent to retract or expand. According to the stent system, after the stent is released, the stent can be shrunk again, and the stent can be positioned in the blood vessel again so as to be accurately released at the target position.

The invention provides a covered stent system which comprises a main covered stent comprising a positioning assembly and a windowing assembly, the windowing assembly comprises a first opening and a second opening, a first reinforcing structure maintains the first opening, and a second reinforcing structure maintains the second opening; the branch covered stent comprises a proximal end limiting stent and a telecentric section limiting stent; when the branch covered stent is connected with the main covered stent, the proximal section limiting stent and the telecentric section limiting stent are located on the two sides of the second reinforcing structure and are matched for limiting, and the sealing areas of the branch covered stent and the main covered stent are tightly attached to form sealed connection. Precise positioning, stable anchoring and effective sealing of the branch covered stent are achieved, meanwhile, the branch covered stent can be effectively prevented from protruding out of a main cavity, and therefore the risks of twisting, narrowing and blocking of the branch covered stent are reduced; the channel operability of subsequent intervention of the main cavity and the branch cavity is guaranteed; and the branch covered stent is prevented from blocking an opening adjacent to the branch artery.

The invention provides a covered stent. The covered stent comprises a cutting stent and a covering film partially covering the cutting stent. The cutting support comprises a plurality of wave rings which are sequentially connected in the axial direction of the wave rings, and each wave ring comprises a plurality of foundation structures which are sequentially connected in the circumferential direction. The plurality of wave rings comprise z-shaped wave rings and double-n-shaped wave rings, and the z-shaped wave rings and the double-n-shaped wave rings are alternately arranged in the axial direction of the cutting support; the basic structure in the z-shaped wave ring is a first basic structure; the basic structure in the double-n-shaped wave ring is a second basic structure, and the second basic structure is a closed grid and is formed by butt joint of two n-shaped wave rods in the circumferential direction in a face-to-face mode. The covered stent has enough supporting performance, flexibility and adherence, internal leakage can be prevented, the thickness of the stent can be well controlled, and the covered stent can be conveyed and enter smaller blood vessels.

The utility model discloses a splenic artery blood flow limiting support, and particularly relates to the technical field of medical instruments, the splenic artery blood flow limiting support comprises a supporting support and a flow limiting support, the supporting support is sleeved outside the flow limiting support, two ends of the flow limiting support are fixedly connected with the inner side wall of the supporting support, the flow limiting support is a covered stent, and the flow limiting support comprises a contraction section and an expansion section. The contraction section and the expansion section are fixedly connected and communicated, and splenic artery blood flow in the supporting stent flows in from the contraction section and flows out from the expansion section. The splenic artery embolism postoperative spleen blood perfusion can be reduced, and the recurrence of splenic hyperfunction is reduced.

The invention provides a covered stent and a stent system.The covered stent comprises a main stent body and a wrapping part, the main stent body comprises a main corrugated ring and a main covering film, the main corrugated ring is covered with the main covering film, and the wrapping part is connected to one side of the main stent body; the wrapping part wraps the main body stent in a releasable mode so that the main body stent can be compressed or unconstrained in the radial direction, the width of a certain position of the wrapping part is defined as W, and the perimeter of the covered stent at the position corresponding to the width W of the wrapping part is defined as C when the covered stent is in a natural expansion state, the relation between W and C meets the condition that W is smaller than or equal to C / 4. W is less than or equal to C / 4, so that the semi-constraint degree of the covered stent can be ensured, the stent can be repeatedly adjusted in the axial direction when being implanted into a blood vessel, and meanwhile, a channel convenient for selecting a branch blood vessel is provided when the covered stent is radially compressed by a wrapping piece, so that the movable space of the channel in the radial direction is not too large.

The application provides an aortic covered stent, an in-situ fenestration instrument and a covered stent manufacturing method, and relates to the technical field of medical instruments.The aortic covered stent comprises a stent body and a covering film covering the stent body, the covering film in the fenestration area is divided into multiple layers and at least comprises an inner layer covering film and an outer layer covering film, and the inner layer covering film and the outer layer covering film are arranged in layers from the inner layer to the outer layer. The inner layer covering film and the outer layer covering film can adopt a lower weaving density, are easy to be punctured to break the film and expand the opening, and a sealing ring can be arranged between the inner layer covering film and the outer layer covering film; the branch stent, the inner layer covering film and the outer layer covering film are attached through surface contact from the inner layer to the outer layer, and the sealing ring is pressed between the inner layer covering film and the outer layer covering film, so that the sealing property is improved and the risk of internal leakage is reduced.

The covered stent comprises a main stent body and a branch stent body, the main stent body comprises a far-end section, a transition section and a near-end section in the axial direction, a branch connecting opening is formed in the side wall of the transition section, and the branch stent body is connected with the branch connecting opening; the side, connected with the branch connector, of the branch support comprises a steering wave ring, and the steering wave ring can rotate so that the branch support can be bent in different directions in the natural state. When the steering wave ring is connected with the main body support, the steering wave ring has the trend of guiding the branch support where the steering wave ring is located to incline towards one side, the steering wave ring and the branch connecting port are connected in a circumferential rotation mode, and the inclination direction of the steering wave ring can be changed by rotating the orientation of the steering wave ring. When the covered stent is implanted into the body of an implanted person, the turning wave ring can be adjusted according to the obtained relative bending form of the branch blood vessel and the main blood vessel at the target blood vessel position of the user, and therefore the matched covered stent structure is obtained.

The application relates to a closure stent and a closure system, the closure stent comprising a covered stent and a one-way valve component, the one-way valve component being arranged in a hollow cavity or / and an extension cavity of the covered stent, the one-way valve component comprising a connecting section and a free section connected with each other, and the one end of the connecting section away from the free section being connected to the covered stent in a circumferential direction, the closure stent comprising a developing element, the distal end of the connecting section being in a strip shape, the strip shape comprising a long axis and a short axis, and the axial section defined by the two ends of the long axis being a first section; the developing element comprising a first developing element and a second developing element, and the connecting line of the developing points of the first developing element and the second developing element being substantially parallel to the diameter in the radial section of the covered stent. The closure stent provided by the application has a better closure effect, prevents blood backflow, and avoids continuous expansion and even rupture of a false lumen.

The invention provides an implantable medical device which comprises a film-covered supporting framework and a plurality of medicine-carrying pointed bodies which are separated from one another, and the plurality of pointed bodies are at least partially arranged on the inner surface of the film-covered supporting framework. According to the invention, the inner surface of the support skeleton is provided with the medicine-carrying pointed bodies, and the pointed bodies are dissolved after being contacted with a medium, such as water, in the membrane-covered support skeleton, so that the medicine can be fused into the medium, the medicine can be conveniently applied to the interior of the membrane-covered support skeleton, and an ideal treatment effect is achieved.

A method for manufacturing a covered stent (10), comprising: providing an inner membrane (11), and sleeving the inner membrane (11) on a core rod; providing a perforated mold (20), and fixing the perforated mold (20) onto the inner membrane (11), wherein the perforated mold (20) is provided with a plurality of through holes (101) for exposing the inner membrane (11); providing an adhesive liquid, and arranging the adhesive liquid in each of the through holes (101) to form an adhesive body (14) in each of the through holes (101); removing the perforated mold (20) to leave the adhesive bodies (14) arranged in a lattice pattern on a surface of the inner membrane (11); providing a vascular stent (13), wherein the vascular stent (13) comprises a plurality of wavy ribs (131), and adjacent two ribs (131) are arranged in mirror symmetry, and sleeving the vascular stent (13) on the inner membrane (11), such that a plurality of adhesive bodies (14) are distributed on a symmetry line of adjacent two ribs (131); providing an outer membrane (12), and covering the outer membrane (12) on the vascular stent (13); providing a heat shrinkable device, and sleeving the heat shrinkable device on the outer membrane (12); and heating the overall structure on the core rod, such that the adhesive bodies (14) are fixedly connected between the inner membrane (11) and the outer membrane (12). Further provided are a covered stent (10) and a covered stent delivery system (30).

The utility model provides a kind of film covering support and conveying system, film covering support includes proximal end main body and distal end main body, distal end main body includes the first branch and second branch being arranged along radial, and the proximal end of first branch and second branch is communicated with proximal end main body;First branch is at least partially curved towards the second branch direction after with the outer wall of second branch fixed connection, the central axis of first branch is formed with the central axis of second branch after connection, to facilitate the blood vessel mouth of first branch and bifurcation blood vessel adaptation, and first branch includes distal end tube segment away from proximal end main body, and the distal end of distal end tube segment includes distal end port, and the part of distal end tube segment at least including distal end port can be freely movable, in this way, the distal end of first branch can be adapted to adjust orientation, to be able to carry out instant adjustment when alignment is inaccurate, to further ensure the accuracy of branch mouth alignment, improve surgical efficiency.

The present application relates to a knitted covered stent, comprising: a support layer and a flow-restricting layer, wherein the support layer is formed from braiding units braided into a hollow cylindrical braided structure, and the flow-restricting layer is formed from braiding units knitted together; the support layer serves as a base scaffold of the stent and provides necessary mechanical support, the flow-restricting layer is a knitted structure covering an exterior of the support layer, wherein the flow-restricting layer uses a knitting process where the braiding units are interlooped and continuously knitted into a mesh covering the exterior of the support layer, and an inner side of the flow-restricting layer is adhered to an outer side of the support layer, resulting in a knitted covered stent comprising a braided structure + a knitted structure; moreover, an interlayer connection structure is provided between the support layer and the flow-restricting layer, so as to achieve interlayer connection and fixation between the support layer and the flow-restricting layer. Compared with conventional laser-cut scaffold + polymer membrane designs, the present application exhibits superior wall apposition and compliance, with better adaptability to vessel morphology and dynamics, thereby improving implantation performance and therapeutic efficacy of stents.

The present application relates to a kind of film-covered stent and stent system, film-covered stent includes stent body, film and the several anchor thorn of being arranged on stent body, film covers stent body, the free end of anchor thorn is covered with detachable protective sleeve.Stent system includes the preceding film-covered stent, also include sheath, the inner diameter of sheath is greater than the outer diameter of stent body in natural state, the film-covered stent and stent system provided by the present application, by adding a detachable protective sleeve at the free end of anchor thorn, to avoid the risk that the free end of anchor thorn contacts and pierces the film that is stacked and mutually extruded during sheathing, to avoid the problem that the whole implant fails due to film damage.

The invention provides an implantable medical device which comprises a film-covered supporting skeleton and a plurality of first pointed bodies for carrying drugs, the film-covered supporting skeleton comprises a supporting skeleton with a plurality of hollowed-out parts and a film fixed to the supporting skeleton and covering at least part of the hollowed-out parts, and the first pointed bodies are located in film-covered areas corresponding to the hollowed-out parts. The first pointed body is connected with the covering film or matched with the covering film so that the first pointed body can be movably limited by the covering film. According to the invention, a plurality of first pointed bodies for carrying medicines are arranged on the covering film corresponding to the hollow part of the support framework, the treatment area of the instrument is enlarged, and the first pointed bodies are connected with the covering film or limited by the covering film, so that the first pointed bodies are effectively prevented from being separated from the covering film.

This invention relates to a covered stent. Capable of radial collapse and expansion, it comprises a first occlusion portion, a stent middle layer, a second occlusion portion, and a support portion connected sequentially from a first end to a second end, and a covering membrane disposed in the first occlusion portion, the stent middle layer, and the second occlusion portion. The covering membrane serves to isolate blood flow. In the radially expanded state, because the outer diameter of the tubular stent middle layer is smaller than the outer diameters of the first and second occlusion portions, the covered stent is fixed to the blood vessel by the occlusion discs at both ends. The stent middle layer does not need to apply radial support force to the inner wall of the blood vessel for enhanced fixation, effectively avoiding tissue pressure. A support portion is provided at the second end of the second occlusion portion, and the outer diameter of the support portion is larger than the outer diameter of the second occlusion portion. The larger diameter effectively prevents the stent from being displaced towards the first end by blood flow, providing double protection for stent fixation.

A method of manufacturing a covered stent is disclosed. The method includes winding a first PTFE tape around a cylinder body of a jig, winding a second PTFE tape around a stent including the jig fitted therein, heating the stent in an oven, fitting the stent into upper and lower elastic members, fitting the elastic members into a mold, pressing the upper elastic member to bond the PTFE tapes to each other and to thus form a first film at a cylindrical body of the stent, taking the elastic members out of the mold, taking the stent out of the elastic members, removing the jig from the stent, forming a silicone coating layer at an expansion portion of the stent, and sewing the spaces in the expansion portion, the second PTFE tape, and the silicone coating layer to form a second film at the expansion portion.

The utility model relates to a diameter-variable blood vessel sheath structure, which solves a series of problems of large operative wound, incapability of intraoperative radiography and the like in the process of treating lower limb artery embolism by opening a Fogarty catheter to take thrombus. The device comprises an outer sheath, an inner sheath and a sheath core which are sequentially nested from outside to inside, the outer sheath comprises an outer sheath main body and an outer sheath base arranged at the near end of the outer sheath main body; the inner sheath comprises an inner sheath body, an inner sheath base is arranged at the near end of the inner sheath body and connected with a hemostasis valve, the far end of the inner sheath body is connected with a self-expansion covered stent sample structure with two open ends, and the length of the inner sheath is larger than that of the outer sheath. The sheath core comprises a sheath core body, a sheath core base is arranged at the near end of the sheath core body, a conical end with the outer diameter gradually reduced is arranged at the far end of the sheath core body, a middle hole for a guide wire to penetrate through is formed in the sheath core body, and the length of the sheath core is larger than that of the inner sheath. The utility model has the advantages of high effectiveness, high safety, strong adaptability, good adaptability, simple structure and convenient operation.

The internal leakage prevention structure comprises a plurality of separation blade single bodies arranged on the outer surface of the covered stent, each separation blade single body comprises a separation blade main body and a supporting wire, the separation blade main body is in a blade shape or a flipper shape, a roughening structure is arranged on the surface of the separation blade main body, and the supporting wire is arranged on the surface of the separation blade main body. One end of the support wire is connected with the catch main body, and the other end of the support wire is fixedly connected with the covered stent; a certain included angle is formed between the blocking piece single bodies and the side wall of the covered stent, part of the blocking piece single bodies are arranged around a pre-windowing hole of the covered stent, the rest of the blocking piece single bodies are arranged on the outer surface of the covered stent in a multi-position scattered mode, and the multiple blocking piece single bodies integrally form a breakwater-shaped structure. After the speed of leaked blood flow is reduced, thrombus is slowly generated, the leaked blood flow is naturally blocked, and therefore the probability of internal leakage is reduced.

A covered stent (20) is provided, including a stent body (21) and a filter membrane (22). The stent body (21) has a proximal end (211) and a distal end (212). The proximal end (211) is configured to be arranged upstream in the blood vessel with respect to the distal end (212). The filter membrane (22) has a mounting portion (222) and a free portion (221). The mounting portion (222) is connected with the stent body (21), and the free portion (221) is connected with the mounting portion (222) and free from the stent body (21).

The application provides a covered stent, which comprises a main stent with a tubular main body, the main stent comprises a proximal end section, a tumor cavity section and a distal end section along the axial direction; the proximal end section is connected to the proximal end of the tumor cavity section, and the distal end section is connected to the distal end of the tumor cavity section; the tumor cavity section is provided with an internal iliac channel and an external iliac channel arranged in the radial direction, the external iliac channel is provided with a first embedded stent, the internal iliac channel is provided with a second embedded stent, and the first embedded stent is in communication with the distal end section; the distal end of the tumor cavity section is provided with an opening, and the distal end port of the second embedded stent is in communication with the opening; the first embedded stent and the second embedded stent are arranged to separate the internal iliac channel and the external iliac channel and reduce the mutual influence between the smaller channels; the radial support strength of the first embedded stent and the external iliac channel is greater than that of the second embedded stent and the internal iliac channel, so that when the tumor cavity section is compressed, the first embedded stent has a small deformation amount due to good support strength, maintains a better external iliac channel shape, and ensures the blood flow passability of the external iliac channel.

The invention discloses a covered stent, a covered stent system and a manufacturing method of the covered stent, the covered stent comprises a main body stent, an anchoring branch and a connecting film sleeve, the anchoring branch comprises an inner pipe section and an outer pipe section, a circumferential joint is formed at the joint of the inner pipe section and the outer pipe section, a first port part of the connecting film sleeve is connected with the anchoring branch, and a second port part of the connecting film sleeve is connected with the anchoring branch; the second port part is connected with the main body bracket at the edge of the window hole; the inner pipe section and the outer pipe section are respectively positioned on the inner side and the outer side of the skirt sleeve connected with the membrane sleeve; the anchoring branch at least can move in the radial direction of the body support to be close to or away from the center axis of the body support, and the anchoring branch is at least provided with an outermost protruding position and an innermost sunken position. When the connecting film sleeve is located at the outermost protruding position, the circumferential connecting position is located above the face where the window holes are located, and the connecting film sleeve is in an outwards-protruding boss shape. When the connecting film sleeve is located at the innermost concave position, the circumferential connecting position is located below the face where the window holes are located, and the connecting film sleeve is in an inwards-concave shape. The invention aims to reduce the difficulty and risk of an operation on the premise of ensuring the anchoring strength.

This application relates to the field of interventional medical devices and discloses a covered stent, including a cover, a support component, and a cut bare stent. The support component includes multiple support coils arranged along a first direction, all of which are disposed on the cover to support it. The cut bare stent is connected to one end of the cover. The cut bare stent includes a connected support portion and an extension portion. The support portion is located outside the cover and is used to abut against and support the inner wall of the blood vessel. The diameter of the support portion gradually increases along the direction away from the extension portion. The extension portion extends along the first direction to the inner side of the end of the cover, and at least a portion of the extension portion overlaps with the support component. The first direction is the direction from the distal end of the covered stent to the proximal end. The covered stent of this application can improve the sealing between the end of the covered stent and the blood vessel wall, ensuring the success rate of minimally invasive surgery and facilitating disease treatment.

The present application relates to the technical field of medical devices, in particular to a release body and a covered stent delivery system. The release body is used for guiding the deployment of a membrane tube in the covered stent delivery system. The release body comprises a plurality of sheath bodies, a shaping member and a connecting member. The plurality of sheath bodies are arranged around the shaping member to form a fixed sheath with a mounting hole. The fixed sheath comprises a distal end and a proximal end. The mounting hole is located at the proximal end and extends towards the distal end. The connecting member is fixed in the mounting hole and used for connecting the membrane tube. The distal end of the membrane tube is connected to the connecting member. The release body drives the membrane tube to deploy by pushing the fixed sheath. The deployment is timely, which avoids blocking the stent release channel and facilitates the release of the stent. When the membrane tube is deployed, the connecting member is disconnected from the distal end of the membrane tube, and then the release body is separated from the membrane tube. The release body can be discharged out of the body, which avoids affecting the food passing through the membrane tube and effectively ensures the function of the membrane tube.

The stent device has a stent cover joined to the stent wires forming the stent body at a plurality of junctions distal to the intersection of the stent wires. By apportioning the junctions to the stent wires between the intersection portions, axial flexibility of the stent device is maintained. The stent cover joined by the disclosed junctions helps prevent luminal tissue from penetrating the stent body and occluding the stent, and placement of the junctions joining the stent cover to the stent device provides a change in positive outcomes for the covered stent device and the patient in which the stent device is placed.

This invention provides a covered stent, comprising a main stent having a tubular body, the main stent comprising a proximal segment, a middle segment, and a distal segment along the axial direction, the diameter of the distal segment being smaller than the diameter of the middle segment; the middle segment comprising a first channel and a second channel along the radial direction, the distal segment being connected to the distal opening of the first channel; a first embedded stent is embedded in the second channel, the first embedded stent comprising a first proximal port, a first outer wall, and a first distal port along the axial direction, the first embedded stent having at least the first proximal port fixedly connected to the main stent, the first outer wall and the first distal port being movably connected to the main stent and being movable along the axial direction after connection, the embedded stent being configured to be slidably connected to the connected middle segment at least along the axis, thereby ensuring that the embedded stent has good bending and extension space when bending, avoiding bending due to axial restriction.

The utility model provides a cutting woven covered stent, which relates to the technical field of medical instruments, and comprises a cutting skeleton, a woven mesh and an ePTFE membrane, the cutting skeleton is designed by combining an open loop and a closed loop, and the two ends of the stent have a good anchoring effect in vivo; and the middle part is of an open-loop structure, and through the support of the woven mesh, the whole body has good support performance and also has flexibility. The stent composed of the cutting framework, the woven mesh and the ePTFE membrane is arranged, the cutting framework is designed by combining an open loop and a closed loop, and the two ends of the stent have a good anchoring effect in the body; and the middle part is of an open-loop structure, and through the support of the woven mesh, the whole body not only has good support performance, but also has flexibility. The outer layer is coated with the ePTFE membrane, so that the coverage area on plaques is larger, the probability that the plaques fall off from stent meshes can be effectively reduced, and micro-embolism after the plaques fall off is prevented. The ePTFE membranes on the inner layer and the outer layer are dip-coated with the drug-loaded coatings, proliferation of vascular smooth muscles is inhibited, and intravascular restenosis is prevented.