Heart-Lung Machines (Bypass)
A heart-lung machine (Figure 89-10) is an apparatus that does the work both of the heart
(i.e., pumps blood) and the lungs (i.e., oxygenates the blood) during, for example, openheart
surgery (Galletti and Colton, 1995). The basic function of the machine is to oxygenate
the body’s venous supply of blood and then to pump it back into the arterial
system. Blood returning to the heart is diverted through the machine before returning it to
the arterial circulation. Some of the more important components of these machines