It is an object of the present invention to provide a medical pump which does not misunderstand that medicinal solution administration is incomplete when low flow rate operation is performed after chemical solution administration is completed. A method of controlling a medical pump which can be judged to be in a blocked state when the internal pressure of a liquid transfusing tube is equal to or higher than a preset value, comprising the steps of sending a chemical liquid at a low flow rate as a prevention of thrombus formation after completing administration of a liquid medicine to a patient A low flow rate step (11) for conducting a low flow rate operation of liquid and a case (12) of judging that it is in a closed state during the low flow rate step (11), the drive motor is operated in reverse, (15) for stopping the drive motor after the reverse rotation operation, wherein in the stopping step (15), the cumulative amount of the solution to be delivered is determined based on a scheduled dosage of the liquid medicine , The drive motor is stopped (15-4).薬液投与が完了した後に低流量動作を行う場合、薬液投与が未完了であるとの誤解が生じないようにした医療用ポンプの提供を目的とする。 輸液チューブの内圧が設定値以上である場合に閉塞状態であると判断可能な医療用ポンプの制御方法であって、薬液を患者に投与完了した後に、血栓の形成予防として薬液を低い流量で送液する低流量動作を行う低流量ステップ(11)と、該低流量ステップ(11)の際に閉塞状態であると判断した場合(12)、駆動モータを逆転作動させて輸液チューブ内の圧力を緩和させる閉塞圧緩和ステップ(14)と、逆転作動した後に駆動モータを停止させる停止ステップ(15)と、を有し、該停止ステップ(15)では、送液の積算量が薬液の投与予定量と同じか又は僅かに上回る値になったときに駆動モータを停止する(15-4)。
