Antimicrobial medical devices including silver nanoparticles
First Claim
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1. A method for making an antimicrobial medical device, comprises the steps of:
- obtaining a polymerizable dispersion comprising in-situ formed Ag-nanoparticles and a silicone-containing monomer or macromer or prepolymer;
treating the Ag-nanoparticles-containing polymerizable dispersion with chloride;
introducing an amount of the chloride-treated polymerizable dispersion in a mold for making a medical device; and
polymerizing the polymerizable dispersion in the mold to form the antimicrobial medical device containing Ag-nanoparticles.
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Abstract
The present invention provides methods for making an antimicrobial medical device, preferably an antimicrobial ophthalmic device, more preferably an antimicrobial extended-wear contact lens, which contains chloride-treated silver nanoparticles distributed uniformly therein. The antimicrobial medical device can exhibit antimicrobial activity over an extended period of time but is substantially free of the characteristic yellowish color of the untreated silver nanoparticles.
113 Citations
14 Claims
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1. A method for making an antimicrobial medical device, comprises the steps of:
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obtaining a polymerizable dispersion comprising in-situ formed Ag-nanoparticles and a silicone-containing monomer or macromer or prepolymer; treating the Ag-nanoparticles-containing polymerizable dispersion with chloride; introducing an amount of the chloride-treated polymerizable dispersion in a mold for making a medical device; and polymerizing the polymerizable dispersion in the mold to form the antimicrobial medical device containing Ag-nanoparticles. - View Dependent Claims (2, 3, 4)
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5. A method for making an antimicrobial medical device, comprising the steps of:
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a. reducing silver ions in a solution in the presence of a stabilizer to obtain Ag-nanoparticles stabilized by the stabilizer to form a Ag-nanoparticle dispersion; b. treating the Ag-nanoparticle dispersion with chloride; c. lyophilizing the chloride-treated Ag-nanoparticle dispersion to obtain lyophilized Ag-nanoparticles; d. directly dispersing a desired amount of the lyophilized Ag-nanoparticles in a polymerizable fluid composition comprising a silicone-containing monomer or macromer or prepolymer to form a polymerizable dispersion; e. introducing an amount of the polymerizable dispersion in a mold for making a medical device; and f. polymerizing the polymerizable dispersion in the mold to form the antimicrobial medical device containing silver nanoparticles. - View Dependent Claims (6, 7, 8, 9)
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10. A antimicrobial ophthalmic device, comprising:
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a polymer matrix, wherein the polymer matrix includes a polysiloxane unit; chloride-treated Ag-nanoparticles distributed therein; and a dye or pigment distributed therein, provided that the medical device is substantially free of the yellowish color of Ag-nanoparticles, wherein the ophthalmic device has a oxygen permeability (Dk) of greater than about 40 barrers, an ion permeability characterized by an ionoflux diffusion coefficient of great than about 1.0×
104 mm2/min, and a water content of at least 15 weight percent when fully hydrated,wherein the antimicrobial medical device exhibit at least a 5-fold reduction (≧
80% inhibition) of viable microorganisms. - View Dependent Claims (11, 12, 13, 14)
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Specification