Hydrogen peroxide sterilization method
US9480764B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2013 |
| Grant date | Nov 1, 2016 |
| Priority date | — |
| Expiry date | Sep 24, 2034 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61L2202/24
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method of metering of hydrogen peroxide gas into an evacuated sterilization chamber is disclosed. The method includes the steps of continuously monitoring a pressure in the sterilization chamber; connecting a passage of known volume to the evacuated chamber for evacuating the passage; sealing the passage; connecting the evacuated passage to a supply of hydrogen peroxide solution for a time sufficient to draw the hydrogen peroxide solution into and fill the passage; sealing the passage; and repeating those steps until a preselected pressure increase in the sterilization chamber is detected. The pressure increase is preferably 19 Torr. The known volume of the metering passage is preferably between 75 μL and 15 μL to control unwanted condensation of hydrogen peroxide in the sterilization chamber. Expensive peroxide concentration measurement systems are replaced with an economical low cost pressure sensor for control of the hydrogen peroxide concentration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.