Blood Warming Bath
Rapid infusion of cold blood in large quantities is known to increase the
risk of cardiac arrest. This can greatly be reduced by infusing through a
suitable, disposable, sterile heat-exchange coil placed in a Grant Blood-warming
Blood at the required temperature is available more quickly than if bags or
bottles themselves are warmed by immersion in warm water, and there is no risk
of overheating the blood. A further advantage is that no more blood is used than
is actually required.
The BW1 Blood-warming bath consists of a polypropylene tank a in
plastic-coated steel outer case, with a clamp for attachment to drip stands
between 12 and 30mm in diameter. The heater and the bulbs of the control
thermostat and the safety cutout are in the base of the tank. They are covered
by a perforated stainless steel tray which prevents the heatexchange coil from
touching the heater. A dial thermometer indicates water temperature and a flat
stainless steel lid is provided.
The pre-set temperature control is set to maintain water temperature at
37°C. At low rates of blood flow, the outlet blood will be at approximately the
same temperature as the bath. At higher flow rates, the outlet temperature will
depend on the flow rate and the efficiency of the heat-exchange coil.
With blood at an initial temperature of 4°C and using a Portex blood-warming
coil, the outlet blood temperature will not fall below 32°C as blood flows up
to 100ml/min. The water in the bath warms up from 15°C to 35°C in less than 10
If the control system fails, an overtemperature cutout prevents transfused
blood from reaching a temperature where haemolysis could take place. If the
safety cutout operates, a warning buzzer sounds and the heater is switched off
until the temperature has fallen and a manual reset button is pressed.
|Overall dimensions l/w/d
||340/180/200 mm (excluding clamp and lid handle)
||220-240V 50/60 Hz, 460 W