Patent ID: 7928147

Claim:
An aqueous anti-microbial and preservative alkaline solution, comprising: (a) a buffer system comprising a Tris buffer system for maintaining the solution at a pH in a range of about 8 to about 9.5; (b) a non-ionic surfactant system comprising at least one surfactant having a multiplicity of ether linkages; (c) metal ion chelating agent comprising EDTA or its pharmaceutically acceptable salts; and (d) a non-ionic preservative having anti-microbial activity comprising benzyl alcohol wherein the concentration of benzyl alcohol is about 0.5% (w/w) to about 2.0% (w/w), wherein the solution has a pH in the range of about 8 to about 9.5 and has anti-microbial properties and is adapted for use as a topical, non-toxic, non-irritating wash solution for cleaning biological tissues or as a topical, non-toxic, non-irritating carrier solution for delivering pharmaceuticals to biological tissues.