An endoluminal prosthesis includes a coiled body and a graft material covering at least part of the coiled body to create a coiled stent graft. The average stent graft diameter to turns width ratio may be about 0.8 to 1 to about 2.4 to 1 when expanded....http://www.google.com.au/patents/US6572648?utm_source=gb-gplus-sharePatent US6572648 - Endoluminal prosthesis and tissue separation condition treatment method
