Plasma cycling sterilizing process

Details Plasma cycling sterilizing process Plasma cycling sterilizing process

A - Human Necessities

61

L

A61L 2/14 (2006.01)

Patent

CA 2088995

A method for plasma sterilization within a controlled temperature range comprising exposing an article in a sterilizing chamber (4) to a gas plasma flowing from a plasma generating chamber (2) until the temperature in the sterilizing chamber (4) rises to a preselected maximum temperature. The flow of the plasma gas to the sterilizing chamber (4) is terminated until the tem- perature in the sterilizing chamber (4) falls to a temperature below the preselected maximum temperature. These steps are repeat- ed until sterilization of the article is effected. The temperature below the preselected maximum temperature when gas plasma flow is again initiated is preferably not more than 3°C below the preselected maximum temperature. The gas plasma can be generated from a mixture of gases consisting essentially of argon, helium, nitrogen or mixtures thereof. Preferably the pressure in the steri- lizing chamber (4) rises to from 0.1 to 10 torr when the gas plasma is flowing into the chamber (4) and the pressure in the steriliz- ing chamber (4) falls to a lower pressure whan the gas plasma flow into the sterilizing chamber (4) is terminated.

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