Patent ID: 8758426

Claim:
A tubular graft comprising: a tubular section defining an interior and having an internal surface, a first end defining a first orifice and a second end defining a second orifice, each of the first and second orifices leading to the interior of the tubular section; and an internal helical formation for imparting a helical flow on fluid passing through the tubular graft, wherein (i) the first end of the tubular graft is tapered such that the first orifice defined by the first end has an inner base and an outer tip, (ii) the internal helical formation terminates at the first orifice within a 180° arc centered on the inner base of the first orifice, and (iii) the tubular graft comprises only one internal helical formation that terminates at the first orifice, and (iv) the helix angle of the internal helical formation is between 8° and 20°.