Abstract
A critical issue facing the development of medical devices such as rotary blood pumps is preventing seizure of bearing gaps. Seizure due to occlusion of the bearing gaps was hypothesized to be related to the adhesion and aggregation of blood plasma. The purpose of this research is acquiring high temperature rheological property of plasma to prevent seizure of bearing gaps of medical devices. Cone and plate viscometer used in this studies. Share rate 383 [1/s] is applied to plasma upon exposure to temperature between 35 [℃] and 55 [℃] up to 6 hours and measure the viscosity every one hour. Additionally, plasma is set five kinds of temperature and let stand for 6 hours in the test tubes and observed the condition every one hour. As the results of experiments, the viscosity did not change at 35 [℃] and 45 [℃], and arrived at the measurement marginal ground within four hours at more than 48 [℃]. As results of observing plasma in the test tubes, plasma did not change at 35 [℃] and at 45 [℃], and precipitation was observed 3 hours after at 49 [℃], and it precipitated white immediately at 50 [℃] and 55 [℃] and the amount of precipitation increased with time progress. As the results of these experiments, there is a possibility that seizure turn up in more than 48 [℃]. In designing bearing gaps of medical devises, it should be designed less than 45 [℃] in gaps to avoid seizure.
