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    STEPPING MOTOR DRIVING APPARATUS
    2.
    发明专利
    STEPPING MOTOR DRIVING APPARATUS 未知

    公开(公告)号：CA2019377C

    公开(公告)日：1997-01-14

    申请号：CA2019377

    申请日：1990-06-20

    Applicant: SHARP KK ,  BAXTER INT

    Inventor： KAWAHARA MASAFUMI ,  BOWMAN GEORGE A ,  MATTHEWS JOSEPH B

    IPC: H02P8/14 ,  H02P8/18 ,  H02P8/00 ,  G08C19/20

    Abstract: A stepping motor driving apparatus includes a stepping motor and a pulse output circuit for outputting drive pulses for driving the stepping motor. A pulse generator generates further pulses which have a frequency higher than thatof the drive pulses. A gate circuit receives the drive pulses from the pulse output circuit and the further pulses from the pulse generator. The further pulses are output by the gate circuit during the high interval of each drive pulse. The stepping motor is thereby driven by pulses having a duty ratio that varies with the frequency of the further pulses.

    Air detector
    5.
    发明专利
    Air detector 未知

    公开(公告)号：GB2312046B

    公开(公告)日：2000-08-16

    申请号：GB9614624

    申请日：1996-07-11

    Applicant: BAXTER INT

    Inventor： BOWMAN GEORGE A ,  MATTHEWS JOSEPH B ,  EYSTER KURT

    IPC: A61M5/00 ,  A61M5/36 ,  G01F1/00 ,  G01F13/00 ,  G01N29/00 ,  G01N29/02 ,  G01N29/032 ,  G01N29/34

    Abstract: The present invention provides an apparatus for detecting excessive air in a liquid flow-through tube. The apparatus includes an ultrasonic transmitter for transmitting ultrasonic signals and an ultrasonic receiver for receiving ultrasonic signals. The ultrasonic transmitter and ultrasonic receiver are separated by the IV tube. The apparatus further provides circuit means for generating at least two transmitting signals to actuate the ultrasonic transmitter and circuit means for detecting received signals. Means are provided for determining whether the received signal is indicative of air or liquid in the IV tube. The apparatus further relies on logarithmic detection of air in fluids rather than linear detection which provides a larger safety factor in prediction of air embolus.

    6.
    发明专利
    未知

    公开(公告)号：DE69310217T2

    公开(公告)日：1997-09-18

    申请号：DE69310217

    申请日：1993-01-05

    Applicant: BAXTER INT

    Inventor： HARA KEITA ,  BETTISCH ALAN G ,  MATTHEWS JOSEPH B ,  CALLAGHAN THOMAS

    IPC: A61M5/00 ,  A61M5/142 ,  G01L9/00 ,  G01L9/04 ,  G01L19/12 ,  G08B21/00

    Abstract: A peristaltic pumping apparatus has a misloaded-tube detector. The detector is constituted of a pair of pressure sensors (20) and a CPU (23). The pressure sensors (20) are located on both sides of a fluid propelling portion (2) onto which an IV tube (1) containing a solution is loaded. The detector detects a tube misloading by making use of pressure which is applied to one pressure sensor (20) when the tube (1) is displaced onto the pressure sensor and is forced against it by the closing of a door. Each sensor consists of first and second electrodes spaced from each other, a pressure-resistive conductive element attached to the first electrode and spaced from the second electrode and capable of connecting thereto, and a resistor connected to the first and second electrodes. The CPU (23) judges from a resistance value of the pressure sensor (20) as to whether the tube (1) is properly loaded or misloaded or whether the pressure sensor (20) is in an operative state.

    ROTARY ENCODER
    7.
    发明专利
    ROTARY ENCODER 未知

    公开(公告)号：CA2015557C

    公开(公告)日：1995-01-24

    申请号：CA2015557

    申请日：1990-04-26

    Applicant: SHARP KK ,  BAXTER INT

    Inventor： GOI NOBUAKI ,  BOWMAN GEORGE A ,  MATTHEWS JOSEPH B

    IPC: F04B43/08 ,  G01D5/34 ,  G01D5/36 ,  G08C21/00

    Abstract: A rotary encoder comprises a rotary plate having a plurality of primary slits defined in the rotary plate in a circular row coaxial with the axis of rotation of the rotary plate. The rotary plate also has at least one reference slit defined therein at a position radially of the circular row of the primary slits. A primary photoelectric detector including a source of light and a photo-sensor positioned one above the other with the circular row of the primary slits intervening therebetween is used to detect the passage of the primary slits therethrough while an auxiliary photoelectric detector including a source of light and a photo-sensor positioned one above the other with the path of travel of the reference slit intervening therebetween is used to detect the passage of the reference slit therethrough.

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