Abstract
Sensor less estimation of pressure and flow was important subject for developing total artificial heart. However, estimated value is affected by viscosity change that occurs in living body usually. In this study, we proposed a novel method for viscosity estimation utilizing the table estimation method. Within short time like one plus, change in blood viscosity and peripheral resistance is considered to be little between systolic or diastolic phases. In the same viscosity, different resistance curves never cross. These characteristics suggest that viscosity could be estimated by motor information of systolic and diastolic phases. The helical flow pump was connected to the mock circulation and tables were created by using known viscosity fluids. Standard data were measured with continuous and pulsatile modes. Estimation accuracy was examined with two continuous-flow conditions regarded to systolic and diastolic phases. There fould a tendency that the more difference two conditions were, the more accurate estimation could be possible. Almost the same results were obtained on pulsatile mode. Possibility of the proposed estimation method was demonstrated.
