A needle for everting body tissue is a linear member having a back portion, an arcuate tissue penetrating portion, and a generally U-shaped tissue everting portion therebetween. The U-shaped tissue everting portion includes a base and first and second tissue abutment arms, the back portion preferably...http://www.google.co.uk/patents/US5957938?utm_source=gb-gplus-sharePatent US5957938 - Tissue everting needle
