Senko Medical Instrument Mfg. Co., Ltd.

Hidetaka Tashiro

Masaaki Numazawa

Shuichi Ishii

There is provided a blood pump apparatus which can supply a pulsating flow of the blood to a body of a patient at a desired rate of flow. R waves are detected from an output of an electrocardiograph to produce a timing signal which is used for controlling timing of intermittent actuation of a motor of a blood pump such as a roller-type pump. A rotation speed of the motor required to obtain the desired flow rate of the blood is automatically calculated in accordance with data inputted by an operator, the data including discharge of the pump per a predetermined revolution of the motor, delay time to be lapsed before an actuation of the motor, duration of the actuation of the motor, and amount of the blood to be fed per a unit period of time. The motor is then controlled to rotate at the calculated speed at the intervals synchronized with the detected R waves. The rotation speed of the motor can be controlled accurately by correcting the calculated rotation speed of the motor in accordance with a detected number of revolution of the motor. The timing of each actuation of the motor can also be controlled so that the pump is driven at intervals synchronized with timing signals generated by a pulse generator.

Blood pump apparatus

A blood suction device for removing blood from a surgical field is provided which can be controlled by a pressure sensing means mounted on a suction tip of the device for starting and stopping the roller pump of the device, and changing the revolution rate of the roller pump, thus enabling to reduce possible hemolysis, clothing and other undesirable effects. The blood suction device comprises pressure sensing means for detecting the pressure exerted thereupon which can be handled adjacent the suction tip by means of pneumatic pressure, and control means for controlling the revolution rate in response to the sensed pressure. The revolution rate when the device is not gripped or pushed by the operator may be set either at zero revolution or at any desired revolution.

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Hadano, Japan

Hidetaka Tashiro