Biodegradable double stent

Abstract

A biodegradable double stent is used for various organs such as a biliary tract, an esophagus, an airway and a ureter. A biodegradable stent having a hollow cylindrical body woven out of a separate wire made of biodegradable polymer so as to have a plurality of rhombic spaces is fixed to an intermediate portion of a primary stent having a cylindrical body. When administered into the organ, the biodegradable stent has its original function of expanding the organ, and is firmly supported in the inner wall of a narrowed passage of the organ by pressurizing the inner wall of the narrowed passage of the organ. After a predetermined time period has elapsed, the biodegradable stent is gradually degraded away by bodily fluids, thereby enabling the primary stent to be easily removed from the organ.

Description

field of invention

[0001] The present invention generally relates to a stent suitable for use in patients with chronic obstructive pulmonary disease (COPD) who do not have a malignancy but who obstruct microvessels such as end ducts, bronchioles, etc. Patients who temporarily exhibit passageway narrowing after surgery on various organs such as the biliary tract, esophagus, airway, and ureter and their surrounding parts. More specifically, the present invention relates to a biodegradable double stent, wherein the biodegradable stent has a monofilament braided hollow cylinder with a plurality of diamond-shaped spaces made of a biodegradable polymer, and is fixed to a The middle part of the main stent of the cylinder, and wherein the biodegradable stent maintains a firm support state by pressing against the inner wall of the organ when inserted into the organ, and then gradually degrades through body fluids when the lesion area heals, thereby enabling the main The stent is easil...

Images