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Apparatus and method for controlling fluid flow in dialysis and the like

  • US 4,762,618 A
  • Filed: 05/29/1986
  • Issued: 08/09/1988
  • Est. Priority Date: 06/04/1985
  • Status: Expired due to Term
First Claim
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1. Apparatus for controlling the flow of a fluid past one side of a membrane in a dialyzer comprising means for providing very rapid control independent of transmembrane pressure (TMP), including, fluid conduit means for conducting said flow of said fluid towards and away from said dialyzer, first constant flow means for producing a first constant flow in said fluid conduit means upstream of said dialyzer, and second constant flow means for producing a second constant flow in said fluid conduit means downstream of said dialyzer, said first constant flow means comprising first constriction means for creating a pressure drop in the flow of said fluid in said fluid conduit means from a first predetermined substantially constant pressure to a second lower pressure, pump means downstream of said first constriction means for pumping said fluid through said fluid conduit means, and pressure measuring means for measuring said second lower pressure, said second constant flow means comprising second constriction means for creating a pressure drop in the flow of said fluid in said fluid conduit means from a third pressure to a fourth predetermined substantially constant lower pressure, pump means upstream of said second constriction means for pumping said fluid through said fluid conduit means, and pressure measuring means for measuring said third pressure whereby said first and second constant flow means can be controlled thereby, based upon said measured second pressure and said measured third pressure, respectively.

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