PROSTHESIS HAVING A SLEEVE VALVE

摘要

Disclosed is a pressure sensitive prosthesis that includes a tubular member (11) having a passageway (12) extending therethrough and a sleeve (13) attached about one end (14) of the tubular member (11). The sleeve (13) functions as a one-way valve to permit fluid flowing through the sleeve lume n in a first direction (17) and under a first pressure, while collapsing in response to fluid flowing in a second direction (18) when the pressure there of exceeds that of the first direction or pressure. One aspect of the invention includes an esophageal anti-reflux expandable prosthesis wherein the sleeve (13) is adapted to invert back through the tubular stent frame (11) to permi t belching or vomiting (fluid or materials under a third, significantly higher pressure). Another aspect of the invention includes a tubular drainage stent , such as a biliary or urethral stent in which the sleeve (13) opens to permit passage of fluids, then collapses to prevent retrograde flow.