Chemical apparatus and process disinfecting – deodorizing – preser – Process disinfecting – preserving – deodorizing – or sterilizing – Using disinfecting or sterilizing substance
Patent
1989-10-18
1991-04-30
Warden, Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Process disinfecting, preserving, deodorizing, or sterilizing
Using disinfecting or sterilizing substance
134 27, 422 28, 422292, 422293, 424471, 424482, 514840, A61K 924, A61K 958, A61L 218
Patent
active
050116614
ABSTRACT:
A method for disinfecting a contact lens comprises immersing the lens in an aqueous solution of H.sub.2 O.sub.2 having a pH of 4 or below and adding to the solution a neutralizing agent comprising a catalyst for decomposing any residual H.sub.2 O.sub.2 and a retarding agent for delaying the decomposition of the H.sub.2 O.sub.2 for a predetermined time in order to permit sterilization of the lens to be substantially complete. The retarding agent preferably comprises either a polymeric coating which dissolves gradually in the H.sub.2 O.sub.2 solution or a semipermeable membrane enveloping the catalyst. The neutralizing agent preferably also contains an auxiliary material which raises the pH of the acidic H.sub.2 O.sub.2 solution. The enzymatic decomposing agent can be embedded in a particulate carrier substance forming the bottom part of a two part container, the upper part of which contains an aqueous solution of H.sub.2 O.sub.2, and the bottom part being separable from the upper part and covered by an inert sieve netting impermeable to the H.sub.2 O.sub.2 solution but permeable to the decomposing agent.
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Ludwig Gerhard
Schafer Horst
Sunderdiek Rainer
Ciba-Geigy Corporation
Fishman Irving M.
Johnston Jill
McC. Roberts Edward
Warden Robert J.
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