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Ultraviolet activated antimicrobial surfaces

An anti-microbial, surface layer technology, applied in the field of light-induced activation, which can solve the problems of low activity, poor substrate adhesion of antibacterial coatings, etc.

Inactive Publication Date: 2009-07-22
变色龙科学公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] In addition to the problems associated with ineffective coating processes and poor substrate adhesion of antimicrobial coatings to antibacterial coatings, the present invention specifically addresses the problem of low activity in antimicrobial (antimicrobial) coatings

Method used

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  • Ultraviolet activated antimicrobial surfaces
  • Ultraviolet activated antimicrobial surfaces
  • Ultraviolet activated antimicrobial surfaces

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Example 1. Antimicrobial Activity of Sputtered Silver Coatings on Rubber

[0076] This example was performed following the coating and detection procedures described in US Patent No. 5,454,886 (the '886 patent). The method and assays were carried out as detailed in Example 6 of the '886 patent.

[0077] Metallic silver was deposited on a 2.5 cm portion of the rubber Foley catheter using a magnetron sputtering facility. The operating conditions are as follows: the deposition rate is 200A° / min; the argon working pressure is 30mTorr; the ratio T / Tm of the substrate temperature to the melting point of the coating metal silver is 0.30. In this embodiment, since the substrate is round and rough, the angle of incidence is variable. That is, the angle of incidence varies around the circumference, on a finer scale, across the sides and vertices of numerous surface features. The antimicrobial effect was detected by a zone of inhibition assay as described in Example 1 of the '8...

Embodiment 2

[0079] Example 2. On rubber Antimicrobial Activity of Sputtered Silver Coatings Over

[0080] This example follows what has been reported for the preparation of a coating coated by DC magnetron sputtering according to Example 7 of U.S. Patent No. 5,454,886. Steps for coating rubber conduit. Antimicrobial testing was performed with Staphylococcus aureus as already described.

[0081] Teflon-coated rubber Foley catheters were coated by DC magnetron sputtering silver with a purity of 99.99% on the surface, the coating conditions were as follows: power 0.5kW, 40mTorrAr / O 2 , an initial substrate temperature of 20° C., a cathode / anode distance of 100 mm, and a final film thickness of 300 nm. The working gas is commercial Ar and 99 / 1wt% Ar / O 2 .

[0082] The antimicrobial effect of the coating was tested by ZOI as described in Example 7 of the '886 patent. Pour the Mueller Hinton agar into Petri dishes. The surface of the agar plate was allowed to dry prior to inoculation w...

Embodiment 3

[0084] Example 3. Sputtered Antimicrobial Silver Coatings

[0085] This example was carried out following the procedure described in Example 11 of the '866 patent. The conditions used in this example include: RF magnetron power 0.5kW, pressure 40mTorr, anode / cathode distance 100mm, 20°C.

[0086] Under the conditions listed above, when the antimicrobial coating was sputtered with argon and 20 wt% oxygen as the working gas, the zone of inhibition varied from 0-2mm, compared with that in Example 11 of the '866 patent The reported ZOI ranges from 6-12mm.

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PUM

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Abstract

The invention is directed to an ion plasma deposition (IPD) method adapted to coat polymer surfaces with highly adherent antimicrobial films. A controlled ion plasma deposition (IPD) process is used to coat a metal or polymer with a selected metal / metal oxide. Exposing the coated surface to ultraviolet light significantly improves the antimicrobial properties of the deposited coatings.

Description

[0001] This application claims priority to U.S. Application Serial No. 11 / 542,531, filed October 3, 2006, which claims benefit from U.S. Provisional Application Serial No. 60 / 776,537, filed February 25, 2006, both The entire content of is incorporated herein. technical field [0002] The present invention relates to the light-induced activation of metal-coated surfaces, and in particular to the improvement of the antimicrobial properties of selected metal / metal oxide-coated surfaces. Background technique [0003] Metallic silver, silver oxide, and silver salts are highly effective antimicrobial agents that control infection by killing bacteria and viruses at wound sites. Silver ions block infection by forming insoluble compounds inside the cell wall, blocking the respiratory chain, and binding and denaturing bacterial DNA preventing replication. Silver-based antimicrobial agents (biocides) also exhibit activity against decay fungi, some common molds, and certain insects (du...

Claims

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Application Information

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IPC IPC(8): C23C14/24C23C14/00C23C14/34
Inventor 特伦斯·S·麦格拉思戴德雷·休厄尔丹尼尔·M·斯托里
Owner 变色龙科学公司
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