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Apparatus for converting a pump to a controller

  • US 4,364,386 A
  • Filed: 12/08/1980
  • Issued: 12/21/1982
  • Est. Priority Date: 12/08/1980
  • Status: Expired due to Term
First Claim
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1. In combination for converting a pump into a controller for controlling within particular limits the pressure of fluid introduced from a source to a patient,a housing having an inlet and an outlet for the flow of fluid and having a chamber in communication with the inlet and the outlet,a resilient diaphragm disposed in the chamber and constrainable in accordance with the pressure of the fluid in the chamber,a member having an adjustable fulcrum and pivotable from the adjustable fulcrum, the member being operatively coupled to the diaphragm for variable positioning pivotably in accordance with the constraint of the diaphragm and the position of the fulcrum,means adjustably positioned for providing an adjustment in the position of the fulcrum on the member,a light source,a photocell,means for providing for a variation in the amount of the light passing from the light source to the photocell in accordance with the variations in the positioning of the resilient member, andmeans responsive to a particular change in the passage of the light from the source to the photocell for indicating that the pressure of the fluid within the housing has exceeded the particular limits.

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