95 results about "Esophageal stent" patented technology

Disclosed is an esophageal stent placed in a stenosed part of the esophagus having a flexible tube to prevent the reverse flow of gastric contents from the stomach is coupled to the lower end of the esophageal stent. The flexible tube has an inside membrane and an outside membrane adhered to each other, thus having a twofold structure with at least one core longitudinally placed between the adhered inside and outside membranes while the core extends from the upper end toward the lower end of the flexible tube. Thus, the flexible tube is prevented from being inverted, and prevents the reverse flow of the gastric contents, and maximizes the operational reliability of the esophageal stent. The flexible tube does not cause a patient pain or discomfort due to frictional contact of the tube with the inner surface of the stomach when the tube moves in the stomach.

Disclosed is an esophageal stent placed in a stenosed part of the esophagus having a flexible tube to prevent the reverse flow of gastric contents from the stomach is coupled to the lower end of the esophageal stent. The flexible tube has an inside membrane and an outside membrane adhered to each other, thus having a twofold structure with at least one core longitudinally placed between the adhered inside and outside membranes while the core extends from the upper end toward the lower end of the flexible tube. Thus, the flexible tube is prevented from being inverted, and prevents the reverse flow of the gastric contents, and maximizes the operational reliability of the esophageal stent. The flexible tube does not cause a patient pain or discomfort due to frictional contact of the tube with the inner surface of the stomach when the tube moves in the stomach.

The invention provides a placing and recovering device of a non-memory alloy esophageal stent. The placing and recovering device of the non-memory alloy esophageal stent structurally comprises an outer sleeve, an inner sleeve, a recovering drag hook and the non-memory alloy esophageal stent. A drag hook handle is arranged at the rear end of the recovering drag hook, a hook head is arranged at the front end of the recovering drag hook, the hook head portion is inserted into the inner sleeve in a penetrating mode, and the inner sleeve is inserted into the outer sleeve. At least one opening is formed in the front end of the inner sleeve, at least one slot hole is formed in the middle of the inner sleeve, and at least three open seams are formed in the front end of the outer sleeve. The rear end of the outer sleeve and the rear end of the inner sleeve are respectively provided with a horn-shaped handle, and the upper end and the lower end of the non-memory alloy esophageal stent are respectively provided with an annular metallization tightening string. One annular metallization tightening string penetrates through the slot hole in the middle of the inner sleeve and is hooked together with the hook head, the annular metallization tightening string at the lower end of the non-memory alloy esophageal stent is hooked together with the opening in the front end of the inner sleeve, and the non-memory alloy esophageal stent is made to cover the front end of the inner sleeve through stretching of the recovering drag hook. The placing and recovering device of the non-memory alloy esophageal stent has the advantages that the structure is simple, placing and recovering can both be achieved, and a common stainless steel non-memory alloy esophageal stent can be used for replacing a traditional expensive nickel-titanium memory alloy esophageal stent.

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.

The invention discloses an expandable esophageal stent. The expandable esophageal stent comprises a stent body, an expansion air bag and a hung tube, wherein the stent body is in a cylindrical tube shape, the expansion air bag is arranged on the outer cylindrical surface of the stent body in a covering mode, the hung tube is connected with one end of the stent body, and the hung pipe is communicated with the expansion air bag. The expandable esophageal stent can be well matched with the esophageal cavity of a human body in shape, an expansion part simulating the esophagus and a spike part simulating the esophagus do not exist, and high tolerance is achieved; the hung pipe penetrates out of the nasal cavity of a patient, and is fixedly arranged outside the human body through adhesive tape and the like, and therefore the problem that due to physiological peristalsis of the esophagus, an esophageal stent moves and falls off can be solved; after the expandable esophageal stent is implanted into the esophagus for a period of time, and the expandable esophageal stent deforms due to growth of tissue around the stent body, the expansion air bag can be inflated through the hung pipe, the tissue around the expandable esophageal stent is expanded, the original shape of the stent body can be automatically recovered, and therefore the problem that the expandable esophageal stent is pressed to deform due to growth of the tissue around the expandable esophageal stent can be solved; the service life of the esophagus is long, and the treatment effect is good.

The invention belongs to the technical field of medical instruments and relates to a nanogold film memory alloy esophageal stent with a photo-thermal therapy function. A nanogold film is prepared by conducting in-situ surface chloroauric acid reduction on a high polymer material with a reduction function used for modifying the surface of a memory alloy wire under the alkaline condition. According to the preparing method, a unique nanogold surface coating method is adopted, the nanogold material is safe and free of toxicity, and the coating process is simple and quick; photo-thermal efficiency is high, and repeated use is realized. The method can be applied to nickel-titanium alloy stents in various shapes and types such as a biliary stent, an intestinal tract stent, a urinary tract stent and a tracheal stent.

An example medical device is disclosed as an expandable stent. The stent includes a tubular scaffold having an inner surface, an outer surface, and a lumen extending therein. The expandable stent also includes a liner disposed within the lumen of the tubular scaffold. Further, the liner is radially spaced from a medial region of the tubular scaffold to define a tissue ingrowth region along an uncovered portion of the medial region. Additionally, the liner extending along the tissue ingrowth region is configured to limit the amount of tissue ingrowth along the medial region of the scaffold.

The invention discloses a biodegradable anti-displacement esophageal stent and a preparing method. The esophageal stent comprises a forward first V circular ring, a symmetrical backward second V circular ring and a middle stent body of a rhombus mesh-shaped structure. The tail portion of the first V circular ring is connected to the corresponding end of the stent body through biodegradable fibers.The tail portion of the second V circular ring is connected to the corresponding end of the stent body through biodegradable fibers. According to the esophageal stent, one single filament penetratesthrough the corresponding positions, so the first V circular ring, the stent body and the second V circular ring are connected together. The stent has good axial compliance, that is to say, the stentcan adapt to the esophageal peristalsis when implanted in esophagus, and displacement is reduced; since the stent body of the rhombus mesh-shaped structure is endowed with large radial supporting force and good axial compliance, the horn-shaped V circular rings can prevent the stent from displacement.

Disclosed is a recyclable esophageal stent. The recyclable esophageal stent is structurally composed of a meshed esophageal stent body and an annular opening tightening line. The annular opening tightening line penetrates into mesh buckles at the two ends of the meshed esophageal stent body. The recyclable esophageal stent has the advantages that the structure is simple, the recyclable esophageal stent can be placed and can also be recycled, the cost is low, the recyclable esophageal stent can be made of common stainless steel wires to replace traditional expensive nickel-titanium memory alloy, and no refrigeration memory needs to be carried out on the recyclable esophageal stent before an operation; once the meshed esophageal stent body falls into the stomach, the meshed esophageal stent body can be dragged out and recycled through a pair of biopsy forceps under the monitoring of an X-ray machine, the meshed esophageal stent body can be repeatedly used after being recycled, the operation is conveniently carried out, the operation time is short, the pain of a patient is small, labor intensity of a doctor is low, and the treatment expenses of the patient can be greatly reduced.