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PUMPING DEVICES, SYSTEMS INCLUDING MULTIPLE PISTONS AND METHODS FOR USE WITH MEDICAL FLUIDS

  • US 20120244018A1
  • Filed: 03/25/2011
  • Published: 09/27/2012
  • Est. Priority Date: 03/25/2011
  • Status: Active Grant
First Claim
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1. A system for delivery of a medical fluid to a patient comprising:

  • a pump system comprising;

    a plurality of at least three chambers, each of the plurality of chambers comprising an inlet through which fluid is drawn into the chamber and an outlet from which fluid is expelled from the chamber;

    a common outlet channel in fluid communication with the outlet of each of the plurality of chambers; and

    a plurality of at least three pistons, each of which is slidably disposed within a respective one of the plurality of chambers; and

    a drive system comprising;

    a cam shaft comprising a plurality of at least three cam lobes, each of the plurality of cam lobes having a profile; and

    a plurality of at least three cam lobe followers, each of which is in operative connection with a respective one of the plurality of cam lobes and is adapted to be placed in operative connection with a respective one of the plurality of pistons;

    wherein the profile of each of the plurality of cam lobes being adapted to provide a positive spike in calculated theoretical output of the pump system to reduce periodic variation in measured output thereof.

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