The Grant BW1 is a convenient and effective solution for warming blood prior to infusion and so reducing the risk of cardiac arrest.
Cooled blood is infused through a suitable disposable sterile heat-exchange coil placed in a Grant blood warming bath which is maintained at 37°C. At low rates of blood flow, the outlet blood will be approximately the same temperature as the bath. At higher flow rates, the outlet temperature depends on flow rate and efficiency of the heat exchange coil.
With this system, blood heats up to the required temperature more quickly than if the containers themselves were warmed by immersion in warm water. There is no risk of overheating and damaging the blood, and no more blood is used than is actually required.