81results about How to "Improve radial support" patented technology

The invention discloses a degradable luminal stent with a thermal adhesive composite structure, and a preparation method thereof and application thereof as a mechanically expanded implantable woven stent against stenotic disease. The stent is made of a hollow tubular stent preforming body composed of woven yarn and degradable macromolecular silk yarn through a heat treatment process, shell yarn ismolten in the braided yarn, fusion flowing occurs at interweaving points of two groups of woven yarn, the interweaving points are bonded, and non-interweaving points of the woven yarn form the complete coating for core yarn through softening, fusion and viscose flow. The preparation method includes the steps of making the shell yarn and the core yarn into the woven yarn which is of a shell core structure, the woven yarn and the degradable macromolecular silk yarn are made into the tubular stent preforming body; and after undergoing heat treatment, the tubular stent preforming body forms the degradable luminal stent with the thermal adhesive composite structure. According to the degradable luminal stent, the interweaving points of the stent are regularly bonded and woven, so that the slippage of the interweaving points is limited, the number of the interweaving points in unit length is kept when the stent is subjected to the effect of a radial external force, and thus the radial support force of the stent is improved.

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.