Stent graft for treatment of emergency rupture of a vessel

1. An emergency rupture stent graft for treatment of a vessel of the human or animal body which incorporates a vessel bifurcation, the stent graft comprising a main tubular body of a biocompatible graft material defining a main lumen therethrough, a graft bifurcation in the tubular body defining a first long leg extending from the graft bifurcation and a second short leg extending from the graft bifurcation, each of the long leg and the short leg comprising a biocompatible graft material and defining respective leg lumens therethrough, each leg lumen being in fluid communication with the main lumen, the second short leg being invaginated within the main tubular body and being fastened to the tubular body within the tubular body at an end remote from the graft bifurcation, the second short leg comprising a proximal end remote from the graft bifurcation and a distal end adjacent to the graft bifurcation, the second short leg comprising a circular continuous ring of shape memory metal being stitched to the second short leg at the distal end whereby to keep open the distal end of the second short leg, the second short leg comprising a valve arrangement to prevent fluid flow through the second short leg from the main lumen and the valve arrangement being able to be opened from outside of the stent graft for the placement of a leg extension stent graft therethrough, the valve arrangement comprising a continuous ring of shape memory metal being stitched to the second short leg at the proximal end thereof, the continuous ring comprising a twin U-shape comprising an inner U-shape and an outer U-shape, the inner U-shape being inside the outer U-shape, each U-shape comprising an apex and the apex of the inner U-shape being more distal than the apex of the outer U-shape, the second short leg thereby forming a inner U-flap and an outer U-flap with the inner U-flap engaging the outer U-flap to provide the valve arrangement, the valve arrangement being able to be opened to a circular shape.

2. The stent graft as in claim 1 wherein the first long leg comprises a diameter to be received into and seal in an iliac artery and the tubular body comprises a proximal end and a distal end, the proximal end being of a diameter to be received into and seal in the aorta, and in use the second short leg being directed towards the contralateral-iliac artery, the valve arrangement preventing fluid flow out of the second short leg from the main lumen and the valve arrangement being able to be opened from outside of the stent graft for the placement of a leg extension stent graft therethrough whereby the stent graft is introduced into the aorta with the distal end extending into the iliac artery, the proximal end being received in the aorta proximally of the rupture and the second short leg directed towards the contralateral-iliac artery.