Vascular anastomoses are invariably performed manually and may be difficult technically particularly in smaller calibre vessels. This may be even more pronounced when an emergency situation exists and a surgeon relatively inexperienced in vascular surgery has to deal with the problem. A technique is described allowing for rapid anastomosis of vessels ranging upwards from a diameter of 2.5 mm using incomplete adjustable metal rings. The technique is simple and can be applied by surgeons with minimal vascular training. This could be extremely useful in the emergency situation, particularly when critical ischemia exists. Also, anastomoses of small calibre vessels such as in arterio-venous fistula may be more simply performed by the aid of the described rings.