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Method and apparatus for detecting occlusion in fluid-infusion tube of peristaltic type fluid-infusion pump

  • US 4,373,525 A
  • Filed: 02/06/1981
  • Issued: 02/15/1983
  • Est. Priority Date: 02/12/1980
  • Status: Expired due to Term
First Claim
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1. A method for detecting occlusion in a fluid-infusion tube of a peristaltic fluid-infusion pump, comprising:

  • pressing respective wall portions of the fluid-infusion tube on inlet and outlet sides of the pump with substantially equal pressures during normal fluid infusing, by means of pressing means which includes a pair of pressing parts on a common movable member;

    detecting a change in the position of said common movable member of said pressing means, said change being a result of a change in the difference between a first distance and a second distance, said first distance being defined by the distance between opposite wall portions of the fluid-infusion tube at said inlet side and being a function of the fluid pressure in the inlet portion of the tube; and

    said second distance being defined by the distance between opposite wall portions of the tube at said outlet side and being a function of the fluid pressure in the outlet portion of the tube, the sum of said first and second distances always being constant; and

    detecting an occlusion in the fluid-infusion tube from said detected change in position.

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