Chemical apparatus and process disinfecting – deodorizing – preser – Process disinfecting – preserving – deodorizing – or sterilizing – Using disinfecting or sterilizing substance
Patent
1998-06-25
2000-11-21
Thornton, Krisanne
Chemical apparatus and process disinfecting, deodorizing, preser
Process disinfecting, preserving, deodorizing, or sterilizing
Using disinfecting or sterilizing substance
422 32, 422 33, A61L 200
Patent
active
061498645
ABSTRACT:
A method is provided for sterilizing materials, particularly polymers, for drug delivery and implantation, wherein the material is treated with supercritical fluid carbon dioxide at pressures in the range of 2000 to 3000 psi (140 to 210 bar) and temperatures preferably between 30 and 45.degree. C. for periods between 20 minutes and six hours, more preferably between 0.5 and 2 hours. Agitation, pressure cycling, and the presence of water were found to enhance the sterilization method, which promotes diffusion of the supercritical fluid carbon dioxide into the cells of the microorganism to thereby alter the pH within the cells, killing them. The magnitude and frequency of the pressure cycling, as well as the process time and temperature, may vary according to the type and form of the material to be sterilized and the type of organisms to be killed.
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Dillow Angela K.
Foster Neil
Hrkach Jeffrey S.
Langer Robert S.
Massachusetts Institute of Technology
Thornton Krisanne
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