Medical devices having antimicrobial coatings thereon
First Claim
1. A medical device comprising a core material and an antimicrobial metal-containing LbL coating, wherein the antimicrobial metal-containing LbL coating is not covalently attached to the core material and imparts to the medical device a hydrophilicity characterized by having an averaged contact angle of less than 80 degree.
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Accused Products
Abstract
The present invention provides a medical device, preferably a contact lens, which a core material and an antimicrobial metal-containing LbL coating that is not covalently attached to the medical device and can impart to the medical device an increased hydrophilicity. The antimicrobial metal-containing coating on a contact lens of the invention has a high antimicrobial efficacy against microorganisms including Gram-positive and Gram-negative bacterial and a low toxicity, while maintaining the desired bulk properties such as oxygen permeability and ion permeability of lens material. Such lenses are useful as extended-wear contact lenses. In addition, the invention provides a method for making a medical device, preferably a contact lens, having an antimicrobial metal-containing LbL coating thereon.
118 Citations
45 Claims
- 1. A medical device comprising a core material and an antimicrobial metal-containing LbL coating, wherein the antimicrobial metal-containing LbL coating is not covalently attached to the core material and imparts to the medical device a hydrophilicity characterized by having an averaged contact angle of less than 80 degree.
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25. A method for preparing a medical device having an antimicrobial metal-containing LbL coating thereon, comprising the steps of:
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(a) contacting said medical device with a solution of a first charged material to form a layer of the first charged material on the medical device;
(b) optionally rinsing said medical device by contacting said medical device with a first rinsing solution (c) contacting said medical device with a solution of a second charged material to form a layer of the second charged material on top of the layer of the first charged material, wherein the second charged material has charges opposite of the charges of the first charged material; and
(d) optionally rinsing said medical device by contacting said medical device with a second rinsing solution, wherein at least one of the first and second charged material is selected from the group consisting of charged antimicrobial metal nanoparticles, charged antimicrobial metal-containing nano-particles, silver-polyelectrolyte complexes formed between silver ions and a polycationic material having amino groups, silver-polyelectrolyte complexes formed between silver ions and a polyionic material having sulfur-containing groups, and combinations thereof. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A method for preparing a medical device having an antimicrobial metal-containing LbL coating thereon, comprising the steps of dipping said medical device in a solution containing a first charged material and a second charged material for a desired period of time so as to obtain the antimicrobial LbL coating characterized by having an average contact angle of about 80 degrees or less, wherein the second charged material has charges opposite of the charges of the first charged material, wherein the first charged material and the second charged material are present in an amount such that the ratio of the charges of the first charged material to the second charged material is from about 3:
- 1 to about 100;
1, wherein at least one of the first and second charged material is selected from the group consisting of charged antimicrobial metal nanoparticles, charged antimicrobial metal-containing nano-particles, silver-polyelectrolyte complexes formed between silver ions and a polycationic material having amino groups, silver-polyelectrolyte complexes formed between silver ions and a polyionic material having sulfur-containing groups, and combinations thereof. - View Dependent Claims (37, 38, 39, 40, 41)
- 1 to about 100;
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42. A method for producing a contact lens having an antimicrobial metal-containing LbL coating thereon, comprising the steps of:
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(a) forming a mold for making the contact lens, wherein the mold comprises a first mold portion defining a first optical surface and a second mold portion defining a second optical surface, wherein said first mold portion and said second mold portion are configured to receive each other such that a contact lens-forming cavity is formed between said first optical surface and said second optical surface;
(b) applying a transferable antimicrobial LbL coating, using a layer-by-layer polyelectrolyte deposition technique, onto at least one of said optical surface, wherein the transferable antimicrobial LbL coating comprises at least one layer of a first charged material and at least one layer of a second charged material having charges opposite of the charges of the first charged material, wherein at least one of the first and second charged material is selected from the group consisting of charged antimicrobial metal nano-particles, charged antimicrobial metal-containing nanoparticles, silver-polyelectrolyte complexes formed between silver ions and a polycationic material having amino groups, silver-polyelectrolyte complexes formed between silver ions and a polyionic material having sulfur-containing groups, and combinations thereof;
(c) positioning said first mold portion and said second mold portion such that said mold portions receive each other and said optical surfaces define said contact lens forming cavity;
(d) dispensing a polymerizable composition into said contact lens-forming cavity; and
(e) curing said polymerizable composition within said contact lens-forming cavity such that the contact lens is formed, whereby said transferable antimicrobial LbL coating detaches from said at least one optical surface of said mold portion and reattaches to said formed contact lens such that said contact lens becomes coated with the antimicrobial metal-containing LbL coating. - View Dependent Claims (43, 44, 45)
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Specification