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Cartridge for liquid infusion apparatus

  • US 4,140,117 A
  • Filed: 05/19/1977
  • Issued: 02/20/1979
  • Est. Priority Date: 05/12/1975
  • Status: Expired due to Term
First Claim
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1. A removable cartridge for use in combination with a liquid drug infusion apparatus that is worn by a patient comprising:

  • (a) hollow shell means having a liquid drug outlet port;

    (b) a collapsible liquid drug container housed within the shell means, the interior of the container being connected to the liquid drug outlet port of the shell means;

    (c) a valve in said liquid drug outlet port that is normally closed when the cartridge is not in combination with the liquid drug infusion apparatus and is normally open when the cartridge is in combination with the liquid drug infusion apparatus;

    (d) pressure means within the shell means for maintaining a substantially constant positive pressure on the liquid drug within the container;

    (e) means for indicating the volume of liquid drug within the container comprising a visible indicator on said container and a visible volume scale on said shell, the indicator being adapted to move relative to the scale as the container collapses whereby the indicator cooperates with the scale to indicate said volume; and

    (f) lock means on the exterior of the shell means for reversibly interlocking the cartridge to the drug infusion apparatus.

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