×

Pre-programmable metering apparatus for a fluid infusion system

  • US 4,299,218 A
  • Filed: 02/19/1980
  • Issued: 11/10/1981
  • Est. Priority Date: 12/02/1977
  • Status: Expired due to Term
First Claim
Patent Images

1. Metering apparatus for establishing a desired fluid flow rate through a administration set, comprising:

  • a housing;

    a rotor mounted on said housing for rotation about a fixed axis, said rotor including a plurality of pressure rollers disposed about the circumference thereof;

    means including a pressure plate for positioning a tubing segment of the administration set in compressive engagement with at least a portion of said rollers whereby fluid is pumped through said tubing segment with rotation of said rotor;

    means including a stepper motor for driving said rotor;

    a source of repetitive clock pulses of predetermined constant frequency;

    a pulse divider providing an output pulse upon each occurrence of a predetermined number of said clock pulses, said pulse divider providing a division factor dependent on an applied digital control signal;

    motor drive means responsive to each said output pulse of said pulse divider for advancing said stepper motor one increment upon each occurrence of said predetermined number of clock pulses;

    rate control means including a register for generating a digital control signal for controlling the division factor of said pulse divider;

    user-actuable means including at least one push-button type switch for applying pulses to said rate control register to establish a predetermined counting state therein whereby the division factor of said pulse divider is set to provide output pulses which step said stepper motor at a rate providing a predetermined desired flow rate in said tubing segment.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×