The Vasculature consists of arteries , arterioles capillaries and veins . Arteries carry blood away from the heart to all parts of the body, where arteries are made up of layers of smooth muscle fibers and elastic membrane tissue. Arterioles carry blood into capillary tissues . capillaries , the smallest vessels , through which exchange take place between the blood and the tissues, whereas veins carry blood back to the heart
Vascular grafts have only been a practical reality for about 30 years , surgical techniques and prosthetic technology have been developed rapidly and allowed life and limb saving surgical interventions that many people take for granted , consider that there was no successful surgical for replacement of the aortic aneurysm until synthetic grafts became available. Artificial veins or arteries are used to replace segments of the natural cardiovascular system that are blocked or weakened . Grafts are inserted to bypass the blockages and restore circulation .
Types of vascular grafts
Vascular grafts maybe biologic or synthetic. There are three categories of biologic grafts which are autologous grafts ,Allografts and heterografts .Autologous grafts (tissues taken from one part of the body and moved to another part .Allografts or homografts are tissue from one person transplanted into another .
Heterografts are tissues from another species that are transplanted into a human . Synthetic vascular grafts are produced from polyester or polytetraflouroethylene teflon ) with either woven or knitted structures, as parallel, tepered and bifurcated tubes. The grafts normally incorporate a coloured line along the lengh of the graft to assist the surgeon in avoiding introducing twist into the graft as it is implanted.