Load conditioning control of and method and apparatus for...

A - Human Necessities – 61 – L

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341/12

A61L 2/06 (2006.01)

Patent

CA 1121026

ABSTRACT OF THE DISCLOSURE Methods and apparatus for steam sterilization in which goods are conditioned by removing air and heating to a desired temperature in a sealable chamber. Pressure change in the chamber is monitored and employed to control conditioning. The goods are subjected to a plurality of controlled cyclic pressure pulses below a predetermined supra-atmospheric pressure level by alternate evacuation and vapor pressurization of the cham- ber. The cyclic pressure pulsing is made responsive to load characteristics which are determined by monitoring pressure change in the chamber. In a specific embodiment, air is flushed from the chamber initially by the injection of steam simultaneously with evacuation; the evacuation phase of each pulse continues until both a predetermined time has lapsed and a predetermined vacuum level has been attained; and, the steam pressurization phase of each pulse is continued until a fixed pressure related to sterilization temperature is reached.

320870

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