148 results about "Covered stent" patented technology

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 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. 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 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.

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.

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.

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.

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.

The invention belongs to the technical field of medicine, and discloses a thoracic aorta in-situ fenestration and whole-course brain protection integrated device and method. According to the method, a bundling balloon is formed by a plurality of small balloons, the different small balloons are controlled to be inflated or shrunk under pressure relief, and the angle of a puncture needle is adjusted through the bundling balloon catheter. And the far-end protection umbrella covers the cluster balloon catheter and is used for preventing thrombus from escaping to the far end. According to the invention, the bundling balloon composed of a plurality of small balloons is designed, and the angle of the puncture needle is adjusted by controlling the different small balloons to expand by filling or shrink by releasing pressure, so that the time for an instrument to enter a membrane rupture window is greatly shortened, and the positioning accuracy of a membrane rupture point of the covered stent is improved; meanwhile, a far-end protective umbrella is arranged to prevent thrombus and other foreign matters from escaping to the far end.

This invention provides a covered stent and a stent assembly. The covered stent includes a first segment and two second segments respectively disposed at both axial ends of the first segment. The covered stent includes a bare stent and a covering. The bare stent includes a helical structure extending from one second segment through the first segment to the other second segment, and the helical structure has a greater ascending angle in the first segment than in the second segment. The covering covers the circumferential surface of the bare stent. The covered stent is used in a stent assembly as a branch stent for treating lesions involving the aortic arch, and it can well adapt to the anatomical structure of the aortic arch, improving treatment efficacy.

The present application relates to a stent system, which comprises a covered stent and a delivery device, the covered stent comprises a main stent and a branch stent, the branch stent is arranged on one side of the main stent, the main stent comprises a main wave coil and a main covering, the delivery device comprises a semi-constrained structure, the semi-constrained structure comprises a sheath and a diameter releasable member, the sheath releasably constrains the main stent through the diameter releasable member to make the main stent radially compressed or released, the sheath comprises a slit, the sheath is provided with two rows of opposite perforations along the axial seam, in the delivery state, the diameter releasable member passes through the perforations to make the sheath radially compress the main stent, the slit extends towards the proximal end to beyond the branch stent, so that the branch stent can be exposed from the sheath, and one end of the sheath is connected to the distal end of the sheath tube or the distal end inner surface. The stent system provided by the present application can expose the branch stent from the slit in the semi-constrained state, and is convenient for releasing the sheath.

The application provides a covered stent system, which comprises a main covered stent, a positioning assembly and a windowing assembly, the windowing assembly comprising a first opening and a second opening, a first reinforcing structure maintaining the first opening and a second reinforcing structure maintaining the second opening; a branch covered stent, the branch covered stent comprising a proximal end limiting support and a distal end limiting support; when the branch covered stent is connected with the main covered stent, the proximal end limiting support and the distal end limiting support are located on the two sides of the second reinforcing structure and are limited in cooperation, and the branch covered stent and a sealing area of the main covered stent are tightly attached to form a sealed connection. The application realizes accurate positioning, stable anchoring and effective sealing of the branch covered stent, effectively prevents the branch covered stent from protruding in the main lumen, thereby reducing the risk of the branch covered stent being twisted, narrowed and occluded, guarantees the operability of the channel for subsequent intervention of the main lumen and the branch lumen, and avoids the branch covered stent from blocking the opening of the adjacent branch artery.

This invention provides a covered stent, comprising a main stent having a tubular body. The main stent includes a proximal segment, a middle segment, and a distal segment sequentially along the axial direction. The distal end of the middle segment has a distal opening. A first embedded stent and a second embedded stent are disposed within the middle segment. The lumens of the first and second embedded stents communicate with the lumen of the proximal segment, and the first embedded stent connects the proximal and distal segments. The second embedded stent is spirally wound around the outer surface of the first embedded stent in the circumferential direction, and the first embedded stent connects the proximal and distal openings. The spiral arrangement of the second embedded stent provides a longer anchoring path for subsequent implantation of smaller stents. Furthermore, by adjusting the number of spiral turns, the proximal and distal ports of the second embedded stent can be arranged on the same side or opposite sides to accommodate guidewire insertion under different surgical procedures, thus broadening its applicability.

The invention discloses a covered stent, a covered stent system and a covered stent manufacturing method.The covered stent comprises a tubular main stent body, a tubular branch stent body and a connecting film sleeve connecting the main stent body and the branch stent body, window holes are formed in the tube wall of the main stent body, and the branch stent body is arranged on the side portion of the main stent body; the branch stent comprises a branch skeleton and a branch covering film, the branch covering film comprises a fixed film fixed relative to the branch skeleton and a skirt film which is arranged on the peripheral side of the branch skeleton in a surrounding mode and can move relative to the branch skeleton, and the skirt film extends from the connecting end, connected with the branch skeleton, of the skirt film to the free end of the skirt film in the mode of being gradually away from the center axis of the branch stent; the connecting membrane sleeve is provided with a first port part and a second port part, the first port part is fixedly connected with the skirt membrane, and the second port part is connected with the main body bracket at the edge of the window hole. The invention aims to improve the flexibility of the branch stent while ensuring the connection reliability.

The present application relates to the technical field of medical devices, and discloses a stent system, which comprises a covered stent and an adjusting structure, the covered stent comprises a first side and a second side in the circumferential direction, the adjusting structure comprises a first adjusting member, a second adjusting member and a locking ring, the locking ring is arranged at the distal end of the first side of the covered stent, the distal end of the second adjusting member comprises a limiting ring buckle, and the limiting ring buckle is sleeved with the distal end of the first adjusting member to form a sleeving part; one of the first adjusting member and the limiting ring buckle penetrates through the locking ring, so that the locking ring limits the movement of the sleeving part in the axial direction, and when the second adjusting member is pulled, the limiting ring buckle cannot slide out of the first adjusting member. By pulling the second adjusting member, the position of the distal end of the first side can be adjusted, so that the first side of the covered stent is attached to the blood vessel wall, thereby the included angle between the first side and the blood vessel wall can be reduced or eliminated, the possibility of leakage of the covered stent is reduced, and the application safety of the covered stent is improved.

The application belongs to the technical field of biomedical new materials, and particularly relates to a film material for metal stents, a preparation method of the film material and a corresponding film stent. The film material for metal stents is composed of E-PLCL, a free radical inhibitor and a photoinitiator. The free radical inhibitor is added in an amount of 0.05% to 0.5% of the weight of the E-PLCL, and the photoinitiator is added in an amount of 0.2% to 2% of the weight of the E-PLCL. The E-PLCL is prepared by modifying PLCL diol by allyl isocyanate. In the application, allyl isocyanate is used as a modifier to modify the PLCL diol by reacting the hydroxyl end groups such as dihydric alcohol with the allyl isocyanate. The modification can be completed in only one step, and the mechanical property is higher than that of the conventional two-step modified polyurethane acrylate material. The photocuring material has low modulus and high elongation at break, and effectively solves the problem that the existing photocuring material library has a too high elastic modulus of the biodegradable printing material, and is difficult to match the human tissue.

The present application relates to a delivery device and a delivery system, the delivery device comprising an inner sheath core, an outer sheath core, an outer sheath tube and a delivery handle, a restraint and a fixing anchor, the proximal ends of the inner sheath core, the outer sheath core and the outer sheath tube being connected to the delivery handle so as to be axially relatively movable under the adjustment of the delivery handle; the restraint being fixed to the distal end of the inner sheath core, and the fixing anchor being connected to the distal end of the outer sheath core so as to be at least partially inserted into the restraint when the inner sheath core and the outer sheath core are relatively axially moved; the fixing anchor comprising a main body and a plurality of anchor hooks, the outer wall of the main body forming a limiting groove at the proximal end side of each anchor hook; the delivery device of the present application radially compresses the wave pole of the bare stent through the restraint during the relative axial movement of the inner sheath core and the outer sheath core before the bare stent is separated from the anchor hook, so that the wave pole can be re-stored in the limiting groove, thereby driving the main body stent connected to the wave pole to be radially compressed, so as to adjust the shape and position of the covered stent during the release adjustment process.

A metal medicine expansion balloon without blocking blood flow comprises an adjustable inner conveying system and a screw-in type outer conveying system, the adjustable inner conveying system is formed by connecting a supporting balloon with an adjustable handle through an inner pushing rod, the screw-in type outer conveying system is arranged on the periphery of the adjustable inner conveying system, and the screw-in type outer conveying system is connected with the adjustable handle through an outer pushing rod. Comprising a covered stent, a drug coating film, a main body skeleton, an outer pushing rod and a screw-in valve, the drug coating film covers the main body skeleton through the covered stent, the near end of the covered stent is connected with the far end of the outer pushing rod, and the near end of the outer pushing rod is connected with the far end of the screw-in valve. The internal system and the external system work cooperatively, a multi-channel blood flow path is formed during expansion, intraoperative blood perfusion is kept, acute ischemia and thrombosis risks during the operation are reduced, the internal supporting balloon adopts a shape memory alloy weaving process, pressure feedback in the expansion process is more obvious, the adherence gap is smaller, the adherence process is conformal, and the system is more suitable for complex lesions; meanwhile, the cutting effect is achieved, and the expansion effect is effectively improved.

The utility model discloses a covered stent capable of being used for treating aortic aneurysm diseases, which relates to the technical field of medical instruments and comprises a self-expanding stent, a clamping piece is fixedly connected to the waist line position of an expanding portion of the self-expanding stent, and the clamping piece is made of super-elastic memory alloy. A mode of combining radial force anchoring and structure anchoring is adopted, a part of an anchoring piece is changed into a clamping piece from a traditional barb, the stent moves downwards after arriving at a designed position, the anchoring piece is unfolded and fixed on small blood vessels on two sides, meanwhile, the upper end of the clamping piece is self-expanded and unfolded, double anchoring is carried out, displacement of the stent is avoided, and the stability of the stent is improved. A self-expanding stent is adopted for supporting and an elastic clamping piece and a native blood vessel are clamped for fixing, additional damage is avoided, meanwhile, double-layer polyurethane films are adopted for covering, the anti-leakage capacity is improved while the flexibility is guaranteed, the blood vessel can be prevented from being damaged, and stable support is provided.