25 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.

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.

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 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 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.

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 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 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.

A material for use in medical devices that are implantable into a patient is provided herein. The material comprises little to no physical additives and beneficial properties for forming yarn that is biocompatible while exhibiting improved degradation resistance, abrasion resistance, and / or tensile strength (among other beneficial properties). In particular, the yarn may be substantially free of titanium dioxide. The yam may form fabric that is usable as or in a medical device for implantation within a patient. Some such medical devices include braided stents, surgical grafts, endovascular grafts, surgical repair mesh, fabric covered sewing rings, sutures, or other implantable medical devices.

A knitted stent extending along a central longitudinal axis may comprise a filament forming a plurality of cells arranged in a plurality of columns and a plurality of rows. The plurality of rows may extend parallel to the central longitudinal axis. The plurality of columns may extend circumferentially around the central longitudinal axis. The plurality of rows may include a plurality of loop rows and a plurality of rung rows interposed between adjacent loop rows. Each cell within the plurality of loop rows may include a circumferential loop element connected to two longitudinally oriented connector elements. The plurality of rung rows may include a plurality of circumferential rung elements connected to adjacent loop rows. A majority of the plurality of loop rows may include open cells having an open end. At least one of the plurality of loop rows may include a plurality of closed cells having a closed end.

The utility model relates to a woven stent with a developing characteristic, which comprises a tubular stent, the tubular stent is composed of a plurality of rows of support rings from front to back, each row of support rings are arranged in a sine wave shape, two adjacent rows of support rings are connected through reinforcing ribs, the support rings and the reinforcing ribs are made of nickel titanium-platinum composite wires, and the reinforcing ribs are made of nickel titanium-platinum composite wires. The platinum core layer is arranged in the middle of the nickel-titanium-platinum composite filament, the nickel-titanium outer layer is arranged outside the platinum core layer, and the developing filament is arranged in the nickel-titanium outer layer. According to the utility model, the stent with a special tubular structure is adopted to manufacture the stent, so that the stent is uniformly and stably stressed in the extrusion or recovery process, and the support rings are connected through the reinforcing ribs, so that the strength of the stent is improved. In addition, the stent is made of the nickel-titanium-platinum composite wire, the nickel-titanium outer layer has the functions of supporting, bending, restoring and the like, the platinum core layer is not prone to fracture or deformation, high toughness is achieved, external force can be resisted to a certain degree, and the strength of the nickel-titanium-platinum composite wire is improved.

The embodiment of the utility model provides a segmented reciprocating type conveying device suitable for a peripheral woven stent, and relates to the technical field of peripheral woven stent conveying. The sectional reciprocating type conveying device suitable for the peripheral woven stent comprises a conveying handle, two sections of fixing sleeves are arranged in the conveying handle, an inner pipe is installed in the fixing sleeves in a sliding mode, and one end of the inner pipe penetrates through an outer pipe arranged at one end of the conveying handle. The rotary knob on the conveying handle is rotated to 90 degrees, at the moment, the cam curved surface on the other side of the rotary knob can press the check block downwards, the push button can be pushed or withdrawn in a reciprocating mode to achieve sectional type release of the support, but at the moment, the check block is still provided with a structure for limiting the stroke of the push button, and the driving piece cannot be completely pushed out of the outer pipe. The woven stent can achieve the functions of segmented conveying and controllable release according to the requirements of doctors in clinic, the release position can be adjusted in a segmented mode in the release process, and release of the woven stent can tend to be in an ideal form.

The present invention relates to a pulmonary embolism thrombus removal device with a blood flow conduction function, the device comprising: an expandable and contractible braided stent (1), the braided stent (1) being made of a shape memory alloy and being used to capture thrombi and conduct blood flow; a delivery sheath (5) being used to constrain the withdrawal and release of the braided stent (1); a hollow push tube (4) being used to deliver the braided stent (1); the push tube (4) being arranged in the braided stent (1) and running through the entire thrombus removal device; the braided stent (1) comprising at least two umbrella-shaped structures when expanded. Compared with the prior art, the thrombus removal device provided by the present invention can quickly reestablish blood flow, realize the blood flow conduction function, and thus alleviate pulmonary embolism; and can efficiently capture thrombi, completely remove thrombi, and greatly reduce damage to the blood vessel wall, thereby having good safety and reliability.

The utility model relates to a kind of vein stents with high compliance, distal end braided stent is formed by wire with coating weaving, with high compliance, stent expanded diameter is slightly larger than target vein pipe diameter but smaller than proximal end laser engraved stent;Distal end braided stent includes wire, and coating located outside wire, coating is divided into inside coating and outside coating, inside coating curvature ratio is greater than outside coating, the surface roughness of inside coating is smaller than outside coating;A group of metal connecting short rod is connected by welding proximal end laser engraved stent and braided stent two parts.This stent has different structure and mechanical characteristics in different anatomical and kinematic characteristics vein segments, better adaptability, can better meet the needs of non-thrombotic iliofemoral vein stenosis occlusive disease patient iliofemoral vein stent implantation in stent fixation, cross joint placement stent.

Described herein is a braided stent having have a plurality of different segments that can reduce or eliminate foreshortening and allow the proximal end of the stent to more reliably open when deployed in a curved vessel. The segments can be connected together by interlocking loops positioned at the end of each segment and can be formed of one or more radially progressing wave patterns.