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Sterile loop calibration system

  • US 5,057,278 A
  • Filed: 04/26/1990
  • Issued: 10/15/1991
  • Est. Priority Date: 04/26/1990
  • Status: Expired due to Fees
First Claim
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1. A sterile-loop calibration system comprising:

  • a sensor cassette having a flow-through passage and including at least one sensor to be calibrated, said sensor being responsive to a characteristic of a gas;

    means defining a chamber;

    means including said flow-through passage and said chamber for defining a closed, endless loop;

    a sterile calibration liquid in said endless loop, said endless loop providing an endless path for circulation of the sterile calibration liquid whereby no calibration liquid is added to the endless loop and substantially little or no calibration liquid is drained from the endless loop during operation;

    a gas injection passage through which a gas can be injected into the sterile calibration liquid in said endless loop;

    means in said endless loop for mixing the gas and the sterile calibration liquid whereby the sterile calibration liquid and the gas can be circulated through the endless loop to thereby permit calibration of the sensor; and

    a gas vent leading from said endless loop to the exterior of the endless loop.

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