Chemistry: molecular biology and microbiology – Measuring or testing process involving enzymes or... – Involving viable micro-organism
Reexamination Certificate
2001-08-13
2002-09-24
Redding, David A. (Department: 1744)
Chemistry: molecular biology and microbiology
Measuring or testing process involving enzymes or...
Involving viable micro-organism
C422S051000, C422S082090
Reexamination Certificate
active
06455272
ABSTRACT:
INTRODUCTION
This invention relates to evaluating bacterial sterilizing effectiveness of a thermal sterilizing cycle. In particular, this invention is concerned with embodiments of a sterility test indicator which individually can provide multiple early evaluations of bacterial spore sterilizing effectiveness, available directly upon completion of a saturated-steam sterilizing cycle, and, further, provide for incubation of potentially living bacterial spores, if any, for biological verification of sterilizing effectiveness.
OBJECTS OF THE INVENTION
A primary object is establishing test indicator constituents which respond to incrementally timed exposure, at a saturated steam temperature of a selected sterilizing cycle, which response is correlated with effectiveness of spore kill in a sterilizer load exposed to the same cycle.
A related object is providing for reliable quantitative measurements of peak absorption of selectively designated spectra of UV and visible-light electromagnetic radiation, which enable evaluations of thermal sterilizing effectiveness directly upon completion of a thermal sterilizing cycle, for prompt and safe release of a sterilizer load, free of a time-delay requirement for potential spore incubation.
A further related object is establishing electromagnetic radiation providing for peak absorption measurements at designated wavelength spectra, for the incremental effects of timed/temperature exposure on soluble constituents, of an indicating material, which are correlated with spore kill of a thermal load sterilizer.
An additional related object is providing fabricating materials for sterility test devices capable of withstanding evacuation of air from a sterilizing chamber for introduction of saturated steam at sterilizing temperature, and providing for transmission of electromagnetic radiation at specified wavelength spectra for multiple evaluations of sterilizing effectiveness.
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patent: 5529931 (1996-06-01), Narayan
patent: 5795730 (1998-08-01), Tautvydas
patent: 6340590 (2002-01-01), Gillis
Baker Raymond N.
Redding David A.
Shanley and Baker
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