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US 10,293,068 B2Granted
Method and device for hydrogen peroxide sterilization
AssigneeSteris Europe, Inc. Suomen Sivuliike
InventorsArja Ruley, Mauri Salmisuo
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Abstract
The invention relates to the sterilization of a load of goods with hydrogen peroxide vapor in a closed space. The method involves a sequence of creating a sub-atmospheric pressure in a sterilization chamber, introduction of vaporized hydrogen peroxide and the use of a gas circulation device within the sterilization chamber, whereby the output of the gas circulation device is controlled according to the pressure in the sterilization chamber. A uniform and consistent distribution of hydrogen peroxide throughout the load is achieved.
Claims6
A method for sterilizing a load of goods, comprising:
- charging a sterilization chamber with a load of goods to be sterilized;
- evacuating the chamber to a minimum pressure determined by characteristics of the load;
- introducing to the chamber a sterilizing atmosphere of vaporized hydrogen peroxide based on a humidity of the sterilizing atmosphere measured within the chamber until the measured humidity indicates that a desired final concentration of the sterilizing atmosphere has been reached throughout the load;
- conducting a sterilization within the chamber when the measured humidity indicates that the desired final concentration of the sterilizing atmosphere has been reached throughout the load, the sterilization being conducted at a pressure prevailing in the chamber when the desired final concentration of the sterilizing atmosphere has been reached throughout the load, the conducting comprising controlling an output of a gas circulation device internal to the chamber to circulate the sterilizing atmosphere at the desired final concentration within the chamber at a constant flow rate dictated by the prevailing pressure;
- and
- after the sterilization, removing the sterilizing atmosphere from the chamber.
3 more elements
Dependencies are inferred from the claim text.