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Infusion device

  • US 4,773,900 A
  • Filed: 08/20/1986
  • Issued: 09/27/1988
  • Est. Priority Date: 08/20/1986
  • Status: Expired due to Fees
First Claim
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1. A power module for a drug infusion device comprising a casing having a first chamber and a second chamber and having a metering flow passage therebetween;

  • adjustable valve means for opening and closing said passage;

    a piston slidably received in said casing and constituting a movable wall of said first chamber;

    said second chamber being of constant volume and being under partial vacuum and said first chamber containing a vacumm-stable viscous fluid therein;

    whereby, as said viscous fluid flows from said first chamber into said constant volume second chamber in response to said vacuum, said piston progressively slides in said casing from an extended position into a retracted position; and

    means for connecting said piston to a sryinge module for operating said syringe module as said piston advances from extended to retracted positions.

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