39 results about "Braided stent" patented technology

The invention provides a braided stent, the ends of at least two adjacent braided wires which are spiral in the same direction in the braided stent are connected through a connecting structure, and the connecting structure is of a smooth structure; in this way, looseness and deformation of the end of the woven stent can be reduced, the risk of load shedding and withdrawing failure can be reduced, and the end of the stent is soft, moderate in supporting force and low in pushing resistance.

The utility model relates to a biliary tract woven stent, which comprises a woven stent formed by weaving one or a plurality of woven filaments, the woven filaments are wound along the axis in a positive and negative spiral line mode and interwoven with one another, and the mutually staggered woven filaments form a lap joint buckle structure capable of freely sliding or a hooking buckle structure limited in sliding at nodes. According to the technical scheme, the structure is reasonable, the stent can be degraded automatically while the radial supporting force of the stent is improved, and the stent taking-out operation is omitted.

The invention discloses an anti-fibrosis drug coating degradable woven stent for treating urethrostenosis, the stent is a hollow cylinder formed by spirally weaving wires, the wires are made of biodegradable polymer materials, the surface of the stent is coated with a drug coating, anti-fibrosis drugs are selected as the drugs, and the anti-fibrosis drug coating is made of biodegradable polymer materials. The drug coating is prepared by using an ultrasonic atomization spraying method; the biodegradable polymer material comprises one or a compound of more than one of poly L-lactic acid, poly D, L-lactic acid, poly (L-lactic acid / D, L-lactic acid), poly (glycolide / lactide), poly (glycolide-lactide), poly (L-lactic acid / caprolactone), poly (glycolide / caprolactone), poly (D, L-lactic acid / caprolactone), polydioxanone and the like. The stent body is made into a self-expanding stent by adopting a weaving method; the biodegradable ureteral stent with the drug coating has good biocompatibility, degradability and mechanical property, and has a wide market application prospect.

The invention relates to the technical field of medical instruments, and discloses a carotid artery micro-net woven stent. The stent comprises a stent main body divided into a stent middle part and a stent end part, the stent main body comprises a first stent, a second stent and a plurality of connecting structures, and the first stent and the second stent are both in a hollow pipe shape and are connected with each other through the connecting structures; the first support and the second support are connected at multiple positions through a plurality of connecting structures, so that movement of the first support and the second support can be limited, and the connecting structures comprise the first connecting structure and the second connecting structure. The two different connecting structures are arranged on the stent body, so that the requirement for different slippage degrees of the ends and the middle is met, layers of the intravascular stent are attached during use, the structural integrity of the stent is kept, the stent is tightly attached to a blood vessel, and good supporting and effective covering are achieved.

A stent with varying porosity is described. The stent can be comprised of multiple stents attached together. A braided stent may have selected regions of increased thickness. The stent may be comprised of wires that are welded together at their ends in order to minimize vessel trauma. The stent may comprise a helically wound radiopaque wire wound through the stent.

The invention relates to a tension-controllable wire feeding device for weaving a support. The tension-controllable wire feeding device comprises a monitoring station, an automatic pay-off mechanism, a detection mechanism, a wire feeding pen and a mold fixing block. The mold fixing block is used for placing or rotating a support mold and is cooperated with the wire feeding pen in a manual holding state to weave different wave-shaped supports, and a micro pressure sensor on the wire feeding pen is located on a wire clamping block in contact with a first handle and a second handle and is used for detecting pressure and transmitting a pressure value to a monitoring console for processing; the detection mechanism detects the apparent structure and the wire winding curvature of the bracket in real time and is used for screening the quality of the formed bracket; according to the invention, the detection mechanism is used for assistance, the man-machine collaborative weaving of the stent with controllable wire feeding tension and controllable wire feeding track is realized, the traditional manual method of manually weaving the stent is improved, and the manual production efficiency and the stent quality are improved.

A stent implant and a method of preparing the same are provided. The stent implant includes a stent-graft (110) and a braided stent (120). At least one axial end of the stent-graft (110) is connected to the braided stent (120). The stent-graft (110) includes a cutting stent (111) and a coating (112). Metal coverage of the cutting stent (111) is 10% to 20%. Surfaces of stent struts in the cutting stent (111) are coated with a connecting layer for enhancing adhesion force of the coating (112) to the stent struts. The coating (112) includes two first membranes (112a): an outer first membrane (112a) disposed over an outer surface of the cutting stent (111); and an inner first membrane (112a) disposed over an inner surface of the cutting stent (111). The outer first membrane (112a) has lower air permeability than the inner first membrane (112a). With this arrangement, the stent implant provides both increased radial support and desirable compliance and is associated with a lower risk of a lumen of the stent-graft (110) becoming stenotic or occluded.

The utility model relates to a conveying system of a woven stent, and relates to the technical field of medical stents. The conveying system of the woven support comprises a push rod assembly and a sheath tube assembly, the push rod assembly comprises an inner tube, a supporting structure is arranged on the inner tube, and the sheath tube assembly comprises a conveying outer sheath. The friction force between the supporting structure arranged on the inner tube and the woven stent is larger than the friction force between the conveying sheath and the woven stent, so that when the conveying sheath moves towards the far end side, the woven stent is supported by the supporting structure and does not easily move along with the conveying sheath; therefore, the problem of pushing failure caused by stacking of the woven stent during pushing can be avoided.

The application relates to a double-layer stent, which comprises a braided body, the hollow column structure of the braided body is formed by interweaving the braided units arranged along a first braiding direction and the braided units arranged along a second braiding direction, the braided body is double-layered and comprises a braided outer layer and a braided inner layer, each layer is formed by interweaving the braided units of the two braiding directions, at least one braided unit of the braided outer layer is connected with at least one braided unit of the adjacent braided outer layer to form a connecting filament, the connecting filament can ensure high radial support force, high metal coverage, low shortening rate and blood flow guiding capacity, and can reduce the potential stent delamination risk of the double-layer braided stent, the braided units are rotationally interwoven at the connecting filament of the stent, the original wire pressing structure is changed, the resistance to deformation near the interlayer connecting point is increased, the braided units near the interlayer connecting point which are displaced due to friction can be quickly returned to the original positions, and the risk of stent delamination in the local part of the stent is resisted.

This invention provides a braided support and a braided support system. The braided support is a tubular braided mesh structure and has an expanded state and a compressed state. The braided support includes at least one first rib and at least one first developing element, wherein the first rib is composed of at least two filaments, and the first developing element is disposed on at least one of the first ribs. The braided support system of this invention is woven from two or more filaments that contain some or all of the developing material, which can improve the developability of the braided support while maintaining a relatively small ratio of developing braids to non-developing braids, i.e., without affecting the radial support force or the opening of the support.

This relates to stents for implantation in body tubal lumens and related methods. [Solution] The stent is an elongated tubular member expandable from a radially folded configuration to a radially expanded configuration, comprising a first plurality of filaments extending in a first helical direction and a second plurality of filaments extending in a second helical direction, wherein the first plurality of filaments extending in the first helical direction and the second plurality of filaments extending in the second helical direction overlap to form a plurality of cells arranged in rows extending circumferentially around the elongated tubular member. At least some of the cells in one or more rows are adapted to provide the stent with increased flexibility.

The utility model relates to the technical field of nickel-titanium woven support forming, in particular to a heating treatment device of an NITI woven support, which comprises a rack, a controller arranged on the rack, a moving mechanism arranged on the rack, a woven mold rod arranged on the moving mechanism, a high-frequency furnace arranged on the rack and a cooling mechanism arranged on the rack. The high-frequency furnace is connected with a heating coil, the controller is electrically connected with the moving mechanism, the high-frequency furnace and the cooling mechanism, the moving mechanism is used for driving the weaving mold rod to reciprocate between the cooling mechanism and the heating coil, the weaving mold rod is used for bearing and sleeving the NITI wire, and the heating coil is used for heating the weaving mold rod and the NITI wire. And the cooling mechanism is used for cooling the weaving mold rod and the NITI wire. According to the utility model, the NITI braided support is rapidly heated in electromagnetic induction, fast in heat conduction, accurate in temperature control and low in power consumption, so that the energy consumption can be reduced, the product quality can be improved, and the production efficiency can be improved.

A method of braiding a stent includes braiding a number of elongate filaments around a mandrel using tensioned braiding carriers without spooling the filaments to the tensioned braiding carriers to form a braided stent having atraumatic ends.

The present application relates to the technical field of medical devices, and discloses a carotid artery micro-network braided stent. The present application comprises a stent body divided into a stent middle part and a stent end part, the stent body comprising a first stent, a second stent and a plurality of connecting structures, the first stent and the second stent both being in a hollow tube form and being connected to each other through the connecting structures, the first stent and the second stent being connected at a plurality of positions through the plurality of connecting structures, so as to limit the movement of the first stent and the second stent, and the connecting structures comprising first connecting structures and second connecting structures. The present application realizes the requirements of different slip degrees of the end part and the middle part by setting two different connecting structures on the stent body, realizes the adhesion between the stent layers during use, maintains the integrity of the stent structure, makes the stent closely adhere to the blood vessel, and realizes good support and effective coverage.

The application relates to a tension-controllable wire-feeding device for braiding a stent, which comprises a monitoring console, an automatic wire-feeding mechanism, a detection mechanism, a wire-feeding pen and a mold fixing block; the mold fixing block is used for placing or rotating a stent mold, and cooperates with the wire-feeding pen in a manual holding state to braid different waveform stents; a micro pressure sensor on the wire-feeding pen is located on a wire clamping block where a first handle and a second handle contact, is used for detecting pressure and transmitting a pressure value to the monitoring console for processing; the detection mechanism detects the apparent structure and wire winding curvature of the stent in real time, and is used for quality screening of the formed stent; the application realizes the man-machine cooperative braiding of the stent with controllable wire-feeding tension and controllable wire-feeding track with the aid of the detection mechanism, improves the traditional manual method of the manual braiding of the stent, and improves the production efficiency of the manual work and the quality of the stent.

The utility model relates to a cryoablation catheter and system, the ablation catheter comprises a vacuum tube with a near end and a far end, and the near end of the vacuum tube is connected with a vacuum joint; a woven bracket is fixed at the far end of the vacuum tube; an air inlet channel and an air return channel are arranged in the vacuum tube, the far end of the vacuum tube extends out of the far end of the vacuum tube and spirally surrounds and is fixed to the woven stent in the axial direction of the woven stent, the far end of the air inlet channel is in fluid communication with the far end of the air return channel, and the air inlet channel and the air return channel extending out of the far end of the vacuum tube form a freezing area; the outer sides of the vacuum tube and the woven stent are further sleeved with a conveying sheath tube, the conveying sheath tube and the vacuum tube can relatively move in the axial direction, and when the woven stent is moved out of the conveying sheath tube, the woven stent is self-expanded and unfolded in a preset shape so as to drive the frozen area to be attached to the target tissue. The cryoablation catheter and system are wide in application range and high in ablation efficiency, and blood flow cannot be blocked when the cryoablation catheter and system are applied to ablation in blood vessels.

The application discloses a thrombus taking device with a composite mesh structure, a support body of which adopts a woven structure and is arranged in a multi-segment structure and comprises a support outer layer and an inner layer. The outer layer is a large-mesh thrombus embedding structure, which is beneficial to the large thrombus to burst in to provide strong anchoring force and realize efficient embedding; the inner layer is a small-mesh leakage prevention structure, which is used for intercepting the thrombus fragments falling off in the thrombus taking process and preventing secondary embolism. The thrombus taking device takes into account the embedding and leakage prevention of the thrombus through the composite mesh structure, and the success rate and safety of thrombus taking are improved. The woven structure and the multi-segment design reduce the contact area and pulling damage of the support and the blood vessel wall, the soft spring arranged at the distal end can buffer the contact stress and reduce the risk of blood vessel intima damage. Meanwhile, the small-mesh independent unit of the inner layer, the multi-segment leakage prevention thrombus bundle port or the double-layer leakage prevention thrombus structure enhances the radial support force of the middle part of the woven support, guarantees the adhesion and embedding stability of the woven support in the tortuous blood vessel, avoids the displacement of the support or the falling off of the thrombus, and is beneficial to improving the prognosis of patients.

The stent includes an elongate tubular member expandable from a radially collapsed configuration to a radially expanded configuration, the elongate tubular member including a first plurality of filaments extending in a first helical direction and a second plurality of filaments extending in a second helical direction, the first plurality of filaments extending in the first helical direction and the second plurality of filaments extending in the second helical direction overlapping to form a plurality of cells arranged in rows extending circumferentially around the elongate tubular member, at least some of the cells in one or more rows are adapted to provide the stent with increased flexibility.

The present application provides a method for manufacturing a woven bracket and a woven bracket, the method for manufacturing the woven bracket comprising: forming a frustum mold, wherein the frustum mold comprises a base plate and a plurality of first bosses and a plurality of second bosses located on the base plate; the plurality of first bosses are located in a first circumferential area of ​​the frustum mold, and the plurality of second bosses are located in a second circumferential area of ​​the frustum mold, and the first circumferential area and the second circumferential area have a height difference; a woven wire is wound along the plurality of first bosses and the plurality of second bosses to form a closed woven bracket; wherein the portion of the woven bracket wound around at least a portion of the plurality of first bosses is annular, and the portion of the woven bracket wound around the plurality of second bosses is arc-shaped.

The utility model relates to a gradient degradable tracheal stent for expanding tracheal stenosis and blocking fistula. The gradient degradable tracheal stent comprises integral woven structures (I) located on the two sides of the stent and a local woven structure (II) located in the center of the stent. The integral woven structure (I) and the local woven structure (II) are both formed by weaving degradable metal wires (1) and degradable polymer fibers (2) in a mixed mode. Compared with a covered woven stent, the tracheal stent has more accurate mechanical enhancement and plugging effects, the tracheal stent has gradient degradation speed after being implanted, the maximum mechanical property and plugging effect are provided in the initial stage of treatment, the mechanical supporting effect and the plugging effect are gradually reduced along with tracheal healing, and the tracheal stent has the advantages of being good in sealing effect and good in sealing effect. The stent can be completely degraded and does not need to be taken out again through an operation, the pain of a patient is relieved, and good application prospects are achieved.

A delivery system for delivering a self-expandable braided stent is disclosed. The delivery system includes a handle containing a roller assembly. The roller assembly includes a roller, a base plate, a connecting shaft, and a slider block. The slider block is supported on the inner tube. The delivery system includes a hypotube fixedly coupled to the slider block and coaxially receiving the inner tube. The stent is mounted on the hypotube in a crimped state. An outer sheath is disposed over the hypotube to cover the stent. When the roller rotates, the slider block allows forward and rearward movement of the hypotube along a longitudinal axis 'x' over the inner tube relative to the outer sheath.

A method of braiding a stent includes braiding a number of elongate filaments around a mandrel using tensioned braiding carriers without spooling the filaments to the tensioned braiding carriers to form a braided stent having atraumatic ends.

The invention discloses a hyperelastic Ti-Ni woven stent based on a selective laser melting forming technology and a preparation method of the hyperelastic Ti-Ni woven stent, and belongs to the technical field of stent manufacturing. The method comprises the following steps: S1, generating a printing model by utilizing modeling software according to a structure model determined by the woven stent; s2, slicing the printing model by utilizing slicing software to generate a printing file; s3, proportioning the material ball powder and adding the material ball powder into a laser forming printing device; s4, the laser forming printing device carries out printing according to the printing file; s5, annealing and quenching; s6, pickling, and removing a pickling solution after pickling to obtain a final bracket; in this way, the method is used for simply and rapidly manufacturing the superelastic Ti-Ni woven stent.

A hybrid braided stent includes a stent body (20). The stent body (20) is a single-layer structure. The stent body (20) is a tubular structure formed by interweaving a plurality of filaments. The end areas of at least two of the plurality of filaments are different.

The invention provides a nasal cavity stent and series thereof, the nasal cavity stent comprises a woven stent, the woven stent is of a cylindrical hollow structure, and the woven stent 1 is a cylindrical stent woven by multiple strands of NiTi memory alloy wires; a hollow channel is formed in the cylindrical support. And each NiTi memory alloy wire starts from the near-end binding part, is wound to the far-end closed part in a crossed manner according to a spiral manner, is bent to form a small circular ring and then is reversely wound back to the near-end binding part to form n wire end sets, and the n wire end sets are bound in the stainless steel terminal. Through the specific shape, size, characteristics and PPI gradual change and mutation design of the woven stent, the woven stent is attached to the anatomical structure of the human body, adaptive radial supporting force is provided for different anatomical parts so as to reduce mucous membrane stimulation, and the clinical supporting requirement is met.

The utility model discloses a knitting support for manual knitting, which comprises an adjusting and fixing mechanism and an adjusting plate mounted in the adjusting and fixing mechanism, a lifting mechanism is arranged at the bottom of the adjusting and fixing mechanism, a lifting footstock is arranged at the top of the lifting mechanism, and the adjusting and fixing mechanism comprises a supporting base. Fixing supports are symmetrically installed on one side of the supporting base, a first motor cover is fixedly installed on one side of the supporting base, an adjusting motor is fixedly installed on one side of the interior of the first motor cover, and the output end of the adjusting motor is fixedly connected with a first chain wheel transmission assembly. Through the characteristic that a first sliding block is in sliding connection with a vertical sliding frame, the position of the first sliding block can be adjusted, braided wires can be hung through the first sliding block, meanwhile, the braided wires can be clamped in an opening of an opening threaded column through the opening threaded column at the top of a second sliding block, and locking is conducted through a locking threaded sleeve; and the braided wire can be conveniently fixed.

The present application relates to a kind of embolism implants for treating carotid internal carotid cavernous fistula, including flow blocking component and the braided stent body of self-expanding;The flow blocking component is set on stent body;The embolism implant has expanded state and stretched state, and can be switched between expanded state and stretched state, and the embolism implant forms the double-layer curved surface structure of circumferential non-closure after expansion, so that the embolism implant is better, and the risk of internal leakage is reduced, and more blood vessels can be applied.

The invention relates to a self-expanding woven stent, a preparation method and application. The self-expansion type woven stent is of a tubular net-shaped structure formed by weaving metal wires in a crossed mode, and the self-expansion type woven stent has the characteristics that the axial size is shortened when the radial size is increased, and the axial size is prolonged when the radial size is reduced; the radial compression amount of the self-expanding woven stent is defined as X, and the ratio of the axial dimension extension amount divided by the nominal length of the stent is defined as the stent extension rate Y; within the radial compression range of 0%-20%, the extension rate Y of the stent and the radial compression amount X are in a linear relation Y = aX, and a is smaller than 1; the surface of the metal wire is provided with a nanoscale oxide layer. According to the self-expanding woven stent with the linear relation between the elongation rate and the radial compression amount, the axial length of the implanted stent can be predicted through the linear relation under the condition that the inner diameter of a blood vessel is known, and more accurate placement positioning and stent type selection basis are provided for an operator.

The invention provides an intracranial vein stent and a delivery system thereof.The intracranial vein stent comprises an inner-layer tube, the inner-layer tube is of a four-cavity structure, namely a first cavity, a second cavity, a third cavity and a fourth cavity, the first cavity is hollow, and the second cavity, the third cavity and the fourth cavity are full; the outer layer pipe is arranged on the inner layer pipe in a sleeving manner; and the woven stent is arranged between the inner-layer tube and the outer-layer tube. The four-cavity structure of the inner-layer tube is arranged, the hollow first cavity can contain a guide wire or a medicine delivery channel, the rigidity of the whole structure is reduced, the filled second cavity, the filled third cavity and the filled fourth cavity achieve staged or local pressure control through independent cavity design, and concentrated stress on the vein wall when the woven stent is unfolded is reduced. The outer-layer tube is sleeved on the inner-layer tube to form a sandwich structure, the braided stent is protected and the preset form of the braided stent is maintained in the conveying process, and meanwhile, the trafficability of the system in tortuous blood vessels is improved through sliding fit between the inner layer and the outer layer. The woven stent is arranged between the inner-layer tube and the outer-layer tube, the non-unfolded state of the woven stent is restrained through interlayer space, controllable release is achieved in combination with the self-expansion characteristic, and mechanical damage of a traditional rigid woven stent to the thin-wall vein is avoided.

The biliary stent weaving tool comprises a main pipe and a plurality of guide positioning pins, a plurality of thread line grooves are formed in the outer wall of the main pipe, the thread line grooves are mutually staggered to form a grid structure, a plurality of first hole sets are formed in the outer wall of the main pipe and are distributed in the axial direction of the main pipe, and a plurality of second hole sets are formed in the outer wall of the main pipe. Each first hole set comprises a plurality of first pin holes, the first pin holes are formed in the circumferential direction of the main pipe at equal intervals, the guide positioning pin can be matched with any first pin hole in a positioning mode, and a tightening screw is installed on the side wall of one end of the main pipe in a threaded mode and used for fixing the head end of a wire. The support can be rapidly knitted through manual operation, the structure is simple, operation is convenient, efficiency is high, and cost is low.