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Optimum hydrogen peroxide vapor sterilization method

  • US 4,956,145 A
  • Filed: 12/30/1987
  • Issued: 09/11/1990
  • Est. Priority Date: 12/30/1987
  • Status: Expired due to Term
First Claim
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1. A sterilization method comprising:

  • injecting a hydrogen peroxide and water vapor mixture into a closed sterilization chamber having a predetermined volume at a predetermined temperature in an initial amount approaching the saturation limit of said vapor mixture in said chamber at said temperature and said volume; and

    ,thereafter, injecting a plurality of intermittent make-up injections of said vapor mixture into said chamber, said make-up injections being at a rate and each said make-up injection being in a variable amount necessary to maintain the concentration of hydrogen peroxide vapor at a level effective for sterilization but less than that concentration of hydrogen peroxide vapor which would raise the concentration of said vapor mixture to the saturation limit which will be present in said chamber immediately following injection of such make-up injection at said temperature.

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