94 results about "Esophageal stent" patented technology

A flexible stent and method for performing a stent within a lumen proximate to a target area is provided. The stent includes a tubular member having proximal and distal ends, where at least a portion of the tubular member is capable of being positioned proximate to the target area. The stent also includes a plurality of stabilization members defined circumferentially about at least a portion of the tubular member, wherein each stabilization member extends inwardly to define an inner diameter that is less than an inner diameter of the tubular member within the tubular member. As a result, the stabilization members are capable of reducing migration of the stent within the lumen and the incident of infolding of the tubular member.

A polymer material capable of gradient degradation. The polymer material is formed by at least two types of aliphatic polyesters having different degradation velocities, the aliphatic polyesters being arranged in an ascending order or descending order of the degradation velocities and fused together. The polymer material may be manufactured as thread materials, barrier materials, tube materials, and controlled drug release carriers, which specifically comprise sutures, medical dressings, adhesion prevention material, hemostasis material, guided tissue regeneration barriers, tissue repair materials, enhancement surgical meshes, drug carriers, cartilage tissue culture scaffolds, scaffolds, and especially urethral scaffolds.

An example medical device is disclosed. The example medical device includes a tubular scaffold. The scaffold includes a longitudinal axis, an inner surface and an outer surface. The medical device also includes a flexible valve extending radially inward from the inner surface of the scaffold. The valve includes an annular chamber extending circumferentially around the inner surface of the scaffold and is configured to shift from a closed configuration to an open configuration.

The invention discloses a degradable magnesium alloy esophageal stent for infants. The esophageal stent comprises annular single bodies, connecting points and projections, wherein each annular single body is formed in the way that a magnesium alloy metal wire is folded in the shape of W and connected to form a cylindrical shape; the annular single bodies have elasticity; bending parts are formed at the two ends of each annular single body; the annular single bodies are axially connected with one another in series by the connecting points; the bottom of each projection is positioned at each connecting point; the top end of each projection is positioned on the outer side of the esophageal stent; and after the magnesium alloy esophageal stent is expanded and released, the projections can be embedded into the esophageal wall and are used for fixing the stent. The degradable magnesium alloy esophageal stent for infants is formed by connecting a plurality of annular single bodies and the length of the esophageal stent can be determined by the number of the connected annular single bodies, so the requirements of the infants suffering from esophageal stenosis are met; the projections on the outer surface of the stent can be embedded into the inner wall of the esophagus and are used for fixing the stent to prevent the stent from moving or slipping off; and the stent can be degraded and absorbed by a human body and the degradation products have no toxicity, so growth and development of infantile patients are not influenced.

The invention provides a nickel-titanium memory alloy esophageal stent placing and recycling device used in X-ray perspective. The nickel-titanium memory alloy esophageal stent placing and recycling device used in X-ray perspective comprises an outer sleeve, an inner sleeve, sampling pincers and a nickel-titanium memory alloy esophageal stent, wherein the head of a jaw of the sampling pincers is inserted in the inner sleeve; the inner sleeve is inserted in the outer sleeve; a latex ring is sleeved on the outer wall of the lower end of the inner sleeve; trumpet-shaped handles are arranged at the rear end of the outer sleeve and the rear end of the inner sleeve; the upper end of the nickel-titanium memory alloy esophageal stent is sleeved on the latex ring; the lower end of the nickel-titanium memory alloy esophageal stent is sleeved at the lower end of the inner sleeve; and a metalized annular tightening line is arranged at one end of the esophageal stent. The nickel-titanium memory alloy esophageal stent placing and recycling device used in X-ray perspective has the advantages that the nickel-titanium memory alloy esophageal stent placing and recycling device is simple in structure, can be placed or recycled and facilitates surgery; the surgery time is short, the paining of a patient is low, the labor intensity of doctors is low, the esophageal stent can be reused after being recycled, and the treatment cost of the patient can be greatly reduced.

The invention provides a sectional type esophageal stent and a weaving method thereof. The sectional type esophageal stent is a cylindrical net-shaped stent formed by weaving a monofilament, wherein two ends of the cylindrical net-shaped stent are respectively of a horn mouth shape, and the cylindrical net-shaped stent comprises an upper horn mouth section and a lower horn mouth section which areconnected through a plurality of hasp structures. Compared with existing hooking type hasps, the sectional type esophageal stent adopting a cross-shaped hasp structure has the advantages that the support force of the whole esophageal stent can be enhanced, and the esophageal stent has relatively good rigidity; two ends of the cylindrical net-shaped stent are respectively of horn mouth design, after the esophageal stent is inserted into the esophagus, the horn mouth in the upper part is beneficial to the pass of foods, the displacement of the stent can be prevented by virtue of the horn mouth in the lower part, and the stent can be well and accurately fixed; and the weaving process of the whole stent is finished by virtue of one filament, so that the rigidity of the esophageal stent is improved, meanwhile, the axial compression deformation of the esophageal stent can be reduced, and the normal use of the esophageal stent can be guaranteed.

The invention relates to a fully fitting esophageal stent complying with esophageal peristalsis. The esophageal stent is composed of three sections in smooth connection with each other, wherein the sections at the two ends are thick and the section in the middle is thin; the two end sections have a shape of cylinder encircled by a single-layer net; the middle section is formed by spirally winding a bar-shaped screen mesh in equal width; an upper hook is arranged at the upper end of the bar-shaped screen mesh; a lower hook is arranged at the lower end of the bar-shaped screen mesh; the upper hook and the lower hook are buckled with each other when the bar-shaped screen mesh is spirally wound; the cross section of the bar-shaped screen mesh is of step shape. The esophageal stent is formed by spirally winding the bar-shaped screen mesh in equal width, so that the esophageal stent has flexibility and following capacity, the esophageal peristalsis can be extremely transferred to the food and the food can be more easily swallowed; the displacement resistance of the esophageal stent can be further enhanced by the following capacity of the esophageal stent; the influences of the stent on the esophageal function and structure are greatly improved; the stent is more comfortable for the patient and is fully fit with human esophageal wall; the trachea is extremely prevented from being pressed by the stent.

The invention pertains to the field of medical instruments and discloses a paclitaxel-loaded ethylene-vinyl acetate esophageal stent and a preparation method thereof. The stent is composed of a bare metal stent and a covering film covering the bare metal stent. The covering film comprises an ethylene-vinyl acetate esophageal backing layer and a paclitaxel medicine film layer. The inside of the ethylene-vinyl acetate esophageal backing layer is closely adhered to the bare metal stent. The outside of the ethylene-vinyl acetate esophageal backing layer is adhered to the paclitaxel medicine film layer. The stent is 50% in the theoretical drug-loading amount ranges from 48.26% -50.81% in the measured drug-loading amount. Within 80d, paclitaxel ranges from 615.274-1101.368 [mu]m/cm2 in the accumulative releasing amount and ranges from 57.93-108359 [mu]m/cm2 and also ranges from 57.93-108359 [mu]m/cm2 in the infiltration amount from the backing layer. The paclitaxel-loaded ethylene-vinyl acetate esophageal stent and the preparation method thereof have following beneficial effects: the preparation method is easily and conveniently applied; the good mechanical property is obtained; the slow release function can be fulfilled for a long time; and the stent has good functions of mechanical support and prevention against growth inside of tumors.

The invention relates to a drug-injectable anti-shift esophageal stent which comprises an esophageal bracket body and a liner membrane. The drug-injectable anti-shift esophageal stent further comprises a drug injection device for injecting a drug into the esophagus; the esophageal stent body comprises a plurality of bracket units which are connected through suture lines and closed skirt membranes; the liner membrane is located in the esophageal stent body, the lower end edge of the liner membrane extends outward radially to form an annular bottom membrane, and an annular drug storage chamber is formed between the liner membrane and the inner wall of the esophagus; the drug-injection device is separately connected to the upper end edges of the liner membrane and the esophageal stent body and communicates with the drug storage chamber. The drug-injectable anti-shift esophageal stent provided by the invention can effectively solve the problem of shift of the esophageal stent and also can directly inject the drug into the diseased region of the esophagus through the drug injection device.

An example medical device is disclosed. An example medical device includes an expandable stent. The stent includes a tubular scaffold formed of one or more interwoven filament. The tubular scaffold includes an inner surface and a flexible valve extending radially inward from the inner surface of the scaffold. Further, the valve is configured to shift between a closed configuration and an open configuration and the one or more filaments of the scaffold bias the valve to the closed configuration while in a nominally deployed state.

The invention relates to a medical apparatus and particularly relates to a membrane-coverage bivalve anti-backflow nickel-titanium memory alloy esophageal stent. A medical silicone rubber membrane (1) is arranged on a tubular mesh support (2) woven through titanium-nickel alloy wires and an elastic valve A (4) is arranged at the lower end of the tubular mesh support (2). The esophageal stent is characterized in that a layer of elastic valve B (3) is arranged at the upper end of the elastic valve A (4). The esophageal stent has the advantages that backflow of food, in particular to liquids, can be well prevented.

Stents are used in combination with a paclitaxel derivative in order to inhibit scarring that may otherwise occur when the implant is placed within an animal. Suitable implants include vascular stents, esophageal stents, tracheal or bronchial stents, gastrointestinal stents, genital-urinary stents, nasal and sinus stents, and ENT stents.

The invention discloses a shape memory polymer material for an esophageal stent and a preparation method thereof. The shape memory polymer material is prepared from, by mass, 30-60 parts of hydrophilic crystallizable macromonomer, 40-70 parts of hydrophobic crystallizable macromonomer and 1-10 parts of cross-linking agent through a polymerization reaction, wherein the hydrophilic crystallizable macromonomer is polyethylene glycol diacrylate, the hydrophobic crystallizable macromonomer is polytetrahydrofuran diacrylate, and the cross-linking agent is pentaerythritol tetra-3-mercaptopropionate.The material is simple to prepare, light and soft in texture and degradable, has the self-unfolding, adjustable and drug sustained-release capacity in a human body environment when serving as an esophageal stent material and shows a higher application prospect.

The invention discloses a pull wire skidproof and antiskid device for a medical esophageal stent. The pull wire skidproof and antiskid device comprises a nose fixing device and an ear fixing device, wherein the nose fixing device and the ear fixing device are connected through an elastic band; the nose fixing device comprises a fixing plate, a nose stuffing pad is arranged on the fixing plate, anda graduation label plate is also rotatably connected to the fixing plate; the ear fixing device comprises a curved stent being conjunctive with the ear outline of a patient, and a rubber soft pad isarranged on the curved stent; and a pull wire locking device is also arranged at one end of the curved stent. The nose fixing device, the ear fixing device and the elastic band are in cooperation, thepull wire skidproof and antiskid device is simple in structure, the pull wire of the esophageal stent of the patient can be fixed, the condition that while in use, the esophageal stent displaces andslips can be avoided, the fine sliding of the pull wire can be shown in a quantification manner, and besides, the pull wire can be prevented from causing pressure sores on the nose and the faces of the patient.

The invention relates to an extractor, in particular to a temporary esophageal stent extractor which comprises a guide head, an inner cannula, an outer cannula and a handle. An inner core is arranged in the inner cannula and is of a hollow structure, and the outer cannula is arranged on the outer side of the inner cannula and is connected onto the handle. The temporary esophageal stent extractor has the advantages that the integral cannulas can be pushed into the esophagus of a patient by a push rod, injury to the esophagus of the patient can be reduced under the guide effects of a withdrawing line and the guide head, the guide head can reach a level of the upper end of a temporary esophageal stent under a fluoroscopic monitoring effect, the outer cannula is withdrawn, stent claws are opened, the inner core is withdrawn, the temporary esophageal stent withdrawing line is pulled, the temporary esophageal stent is contracted by the aid of the stent claws and is completely withdrawn into the inner cannula, the outer cannula is pushed, then the stent claws are withdrawn into the outer cannula, the stent extractor can be withdrawn via the esophagus of the patient, and accordingly injury to the esophagus of the patient can be reduced to the greatest extent in stent extraction procedures.