A - Human Necessities – 61 – L
Patent
A - Human Necessities
61
L
A61L 2/26 (2006.01) A61L 2/28 (2006.01) G01K 3/04 (2006.01) G01K 11/06 (2006.01) G01N 31/22 (2006.01)
Patent
CA 2133887
IMPROVED STEAM STERILIZATION PROCESS MONITOR ABSTRACT OF THE DISCLOSURE A sterility indicator device for use in a steam autoclave is disclosed comprising (a) a backing strip, (b) an organic compound having a normal melting point which is greater than a predetermined control temperature, said melting point being depressed below said control temperature by the absorption of water into the organic compound when said organic compound is exposed to saturated steam at the control temperature, said normal melting point of the organic compound being above the control temperature, the organic compound being mounted on the backing strip, (c) a wicking means having one end of said wicking means in intimate contact with said compound, said wicking means extending away from said compound to the distal end of said backing strip, and (d) a water vapor transmission rate controlling cover strip covering said compound and wicking means said cover strip being permeable to water vapor and having a water permeability coefficient at the control temperature such that sufficient water vapor will permeate the cover strip to reduce the melting point of the organic compound from its normal melting point to at least the control temperature; said device being unresponsive to heat at the control temperature in the absence of steam, and displaying visual response of the integrated time/temperature exposure of a system to moist heat, the cover strip being bonded only to the land area of the backing strip by heat sealing.
Larsson Raymond P.
Nieves Judith
Gowling Lafleur Henderson Llp
Pymah Corporation
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