Biomedical Engineering Reference
In-Depth Information
Fig. 9.6 a
spiral vortex ventricular device commonly used during heart surgery.
b
left ventricular
assist device pumping blood from the left ventricle to the aorta, connected to an externally worn
control unit and battery pack. (Adapted from Wikicommons)
the determining factor for implantation of the device to relieve ventricular hydraulic
burden.
Examples of ventricular assist devices studied through computational modelling
are given in Fig.
9.6
. The spiral vortex ventricular assist device is a pneumatically-
driven pulsatile device used during heart surgery to reproduce the blood pumping
action while surgery takes place on the heart itself. It consists of a conical-shaped
housing, an outflow tract located toward the apex, and an inflow conduit directed
tangentially to the diaphragm housing junction with an angle of 35 degrees down-
ward. During the diastolic phase, air is extracted from the device via the air connec-
tor, causing the diaphragm to deflect upwards. The low pressure generated induces
blood to flow into the conical housing via a valve. During systole, air is injected
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