The aim of the work introduced is this paper is to provide a suitable solution for the emergency treatment of Acute Urinary Retention. In order to fulfil the clinical needs, this stent presents different innovative features :- at least two distinct shape memories triggered successively by increasing its temperature : (1) an extension phase to release the urethra, and (2) a contraction phase to easily remove the stent,- a bio-compatible silicone coating. This coating prevents the stent, heated using Joule effect, from damaging surrounding tissues,- a global implantation procedure suitable for emergency treatment.The double shape memory effect is achieved using NiTi shape memory alloy.