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Pre-vacuum:
Pre-vacuum or high vacuum sterilization
consists of four basic phases: a conditioning
phase, an exposure phase, an exhaust phase
and a drying phase. The conditioning phase
removes air from the chamber by pulling a
vacuum and then warms the instruments by
injecting steam.
Sterilization occurs during the exposure
phase when the chamber reaches a tem-
perature of 270˚F (132˚C). The exposure
phase in a pre-vacuum type of sterilizer is
4.0 minutes. The exhaust phase removes the
steam from the chamber. The drying phase
is accomplished by pulling an additional
vacuum and allowing the instruments to dry
under vacuum for approximately 20 minutes.
KARL STORZ has validated sterilization pro-
cedures in a pre-vacuum sterilizer using the
following conditions:
Temperature:
270˚F (132˚C)
Exposure Time:4 minutes for all instruments
4. Trays should be positioned in the sterilizer
so that there is adequate circulation and
penetration of steam, air removal and
condensate drainage. A loosely loaded
sterilizer allows the best penetration of
sterilant.
5. At the completion of the steam steriliza-
tion cycle, all instruments should remain
untouched until adequately cooled.
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