A stent for use in the treatment of stenosis of the ostium of tubular organs, more particularly, blood vessels comprising a multiplicity of flanges located at an end of a generally tubular stent body. The flanges permit the accurate positioning of the stent within the vessel, while presenting dislodgement...http://www.google.co.uk/patents/US6096071?utm_source=gb-gplus-sharePatent US6096071 - Ostial stent
