Abstract
Hydrodynamic data, especially the water hammer (WH), for five valves (four disk and one polyurethane) were obtained to select appropriate valves for VAD pump. The results were as follows: 1) WHs by Björk-Shiley monostrut (BS(MS)) were higher than those by BS. When BS (MS) was used as an inlet valve, irregular behavior of the disk was observed at low %-systole conditions. 2) When the disk material was changed from pyrolytic carbon to delrin, WH decreased. 3) WHs by Medtronic-Hall were slightly higher than those by BS. 4) Conduit type tri-leaflet polyurethane valves developed in our lab for VAD use, exhibited low WH as compared to disk valves.
