A stent is provided comprising a tubular body formed by a polymer layer of expanded polytetrafluoroethylene and a layer made of alloy and comprising two open ends, at least one anterior side wall opening acting as an aperture allowing puncture by a needle, the side wall opening being at a predetermined distance from each of the ends and being formed in the alloy layer to allow a needle to penetrate inside the tubular body. The exact position of the anterior side wall opening within a body cavity can be identified by radiopaque markers, and the inherent nature of the expanded polytetrafluoroethylene allows puncture by a needle when it is desired to unplug a blocked or partially-blocked stent.
