ULTRASONIC DETECTOR
    93.
    发明专利

    公开(公告)号:JPS6420469A

    公开(公告)日:1989-01-24

    申请号:JP10984588

    申请日:1988-05-02

    Applicant: ABBOTT LAB

    Abstract: PURPOSE: To detect if the air is mixed in an intravenous injection feeding tube by providing an ultrasonic transmitter and an ultrasonic receiver on both sides of a flow passage. CONSTITUTION: A cassette pump 10 forms a flow passage 40 by interposing an elastic member 16 between a front plate 12 and a rear plate 14. An injection is supplied to a patient from an injection source through a flowing-in port 18, the flow passage 40, and a flowing-out port. The passage 40 is bent in semicircular states in air detecting means 22 and 24 which are held in ultrasonic detectors 26 and 28 respectively having ultrasonic transmitters 54 and receivers 56 provided with piezoelectric chips 72 on substrates 58. The quantities of ultrasonic waves propagated to the receivers 56 from the transmitters 54 decrease when air exists in the flow passage 40. When the signal from the receiver 56 drops, an alarm device is actuated to stop the supply of the injection.

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