In order to produce a pulsatile blood flow pattern that includes time periods of relatively high blood flow rates and time periods of relatively low blood flow rates, the operating speed of a blood pump can be selectively controlled to produce an operating speed pattern that includes time periods of relatively high rotation speeds and periods of relatively low rotation speeds. For example, the blood pump is rotated at a first speed for a first period of time. The speed of the blood pump is then decreased from the first speed to a second speed and is operated at the second speed for a second amount of time. The speed of the blood pump is then decreased to a third speed for a third amount of time. If desired, the operating speed pattern can be repeated to continue the pulsatile blood flow pattern.為了產生一包括具有相對高血流率之時間週期及具有相對低血流率之時間週期的搏動式血流型樣,可選擇性地控制一血泵之操作速度以產生一包括具有相對高旋轉速度之時間週期及具有相對低旋轉速度之週期的操作速度型樣。舉例而言,在一第一時間週期中使該血泵以一第一速度旋轉。接著使該血泵之速度自該第一速度降低至一第二速度且在一第二時間量中以該第二速度操作。接著在一第三時間量中使該血泵之速度降低至一第三速度。必要時,可重複該操作速度型樣以繼續該搏動式血流型樣。100...左心室輔助血泵102...出口導管108...間隙110...外殼112...入口套管115...內壁120...定子140...轉子H...心臟LV...左心室RV...右心室
