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DIFFERENTIAL PRESSURE BASED FLOW SENSOR ASSEMBLY FOR MEDICATION DELIVERY MONITORING AND METHOD OF USING THE SAME

  • US 20090157040A1
  • Filed: 12/15/2008
  • Published: 06/18/2009
  • Est. Priority Date: 12/17/2007
  • Status: Active Grant
First Claim
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1. A differential pressure based flow sensor assembly to determine the flow rate of a fluid system comprising:

  • a disposable portion having;

    a body defining a fluid flow passage forming an inlet and an outlet;

    a flow restricting element positioned along the fluid flow passage between the inlet and the outlet;

    an upstream fluid pressure membrane at a location in the fluid flow passage between the inlet and the flow restricting element; and

    a downstream fluid pressure membrane at a location in the fluid flow passage between the flow restricting element and the outlet; and

    a reusable portion having;

    an upstream fluid pressure sensor to sense an upstream fluid pressure at an upstream location in the fluid flow passage between the inlet and the flow restricting element, the upstream fluid pressure sensor being positioned to generally determine the fluid pressure at the upstream fluid pressure membrane; and

    a downstream fluid pressure sensor to sense an downstream fluid pressure at a downstream location in the fluid flow passage between the flow restricting element and the outlet, the downstream fluid pressure sensor being positioned to generally determine the fluid pressure at the downstream fluid pressure membrane.

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