Pumps – Condition responsive control of pump drive motor – Single motor control element responsive to means sensing...
Patent
1989-04-26
1990-04-24
Smith, Leonard E.
Pumps
Condition responsive control of pump drive motor
Single motor control element responsive to means sensing...
417 63, 417415, 417479, 604154, F04B 2306
Patent
active
049195964
ABSTRACT:
A fluid delivery monitoring and control apparatus for use in a medication infusion system is designed for use with a disposable fluid pathway that incorporates a sterile cassette containing pumping elements and sensor interfaces. The apparatus comprises a multi-segment drive mechanism, controller, and monitoring system. Fluid pumping is accomplished by controlling DC motors in the drive mechanism, each of which is coupled to two valves and a reciprocating piston for an individual pumping channel in the cassette. The motor is geared down to provide an appropriate maximum speed and torque. A cam sequentially actuates an inlet valve, piston, and an outlet valve in the cassette. A range of fluid delivery rates is achieved by periodically sending pulses to the motor. The output flow rate of the pump is maintained by a digital feedback controller which uses closed-loop feedback control to provide accurate regulation. At regular time intervals, the controller computes the motor voltage pulse width based upon feedback information from an encoder.
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Henke James L.
Slate John B.
Bissell Henry M.
Miller Leslie S.
Pacesetter Infusion, Ltd.
Scheuermann David W.
Smith Leonard E.
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