Claims for Patent: 8,226,971

Summary for Patent: 8,226,971

Title:	Catheter lock solution comprising citrate and a paraben
Abstract:	This invention relates to compositions, methods, devices and kits relating to the infusion of a catheter lock solution into an indwelling catheter. Inventive compositions, methods, devices and kits aid in diminishing the effects of microbial infection in catheters and occlusion of the catheters. A lock solution provided by the invention includes citrate and a paraben. The solution preferably has a density suitable for retention of the solution in a catheter during the lock period. Another lock solution provided by the invention includes citrate, a paraben and a photo-oxidant, such as, for example, methylene blue.
Inventor(s):	Ash; Stephen R. (Lafayette, IN), Steczko; Janusz (West Lafayette, IN), Swanson; Gary L. (Elkhorn, WI)
Assignee:	Ash Access Technology, Inc. (West Lafayette, IN)
Application Number:	12/792,286
Patent Claims:	1. An aqueous antimicrobial solution comprising about 1.5 to 47% by weight citrate, up to 1500 mg/100 ml methylene blue, and about 0.005-0.6 percent (g/100 ml) paraben dispersed or dissolved therein. 2. The solution of claim 1, wherein the paraben is methyl paraben, ethyl paraben, propyl paraben, butyl paraben, or a combination thereof. 3. The solution of claim 1, wherein the solution comprises methyl paraben. 4. The solution of claim 1, wherein the solution comprises propyl paraben. 5. The solution of claim 1, wherein the solution comprises methyl paraben and propyl paraben. 6. The solution of claim 5, wherein the concentration of methyl paraben in the solution is from about 0.05 to about 0.5 percent, and the concentration of propyl paraben in the solution is from about 0.005 to about 0.5 percent. 7. The solution of claim 1, wherein the concentration of citrate in the solution is at least as high as the calcium concentration in a patient's blood. 8. The solution of claim 1, wherein the concentration of citrate in the solution is from about 1.5 to about 23% by weight. 9. The solution of claim 1, wherein the citrate has a concentration of from about 1.5 to about 15% by weight. 10. The solution of claim 1, wherein the citrate is trisodium citrate dihydrate. 11. The solution of claim 1, wherein the pH of the solution is from about 4 to about 8. 12. The solution of claim 1, wherein the relative density of the solution is from about 1.000 to about 1.300 g/ml. 13. The solution of claim 1, wherein the solution further comprises a viscosifying agent. 14. The solution of claim 13, wherein the viscosifying agent comprises dextran, polyethylene glycol, glycerin, polygeline, a non-metabolizable sugar, or a combination thereof. 15. The solution of claim 1, wherein the citrate has a concentration of from about 1.5 to about 15% by weight, the concentration of methylene blue in the solution is up to about 1500 mg/100 ml, and the solution comprises about 0.05 to about 0.5 percent methyl paraben and about 0.005 to about 0.5 percent propyl paraben. 16. The solution of claim 1, further comprising alcohol. 17. The solution of claim 1, wherein the methylene blue has a concentration of about 1 mg/100 ml to about 100 mg/100 ml. 18. The solution of claim 1, wherein the paraben has a concentration of about 0.1 percent to about 0.3 percent. 19. The solution of claim 1, wherein the citrate has a concentration of from about 1.5 to about 23% by weight, the concentration of methylene blue in the solution is about 1 mg/100 ml to about 100 mg/100 ml, and the concentration of paraben is about 0.1 percent to about 0.3 percent. 20. An aqueous antimicrobial solution comprising about 0.01-1 M citrate, up to 1500 mg/100 ml methylene blue, and about 0.005-0.6 percent (g/100 ml) paraben dispersed or dissolved therein. 21. The solution of claim 20, wherein the concentration of citrate is about 0.1 to about 0.5 M. 22. The solution of claim 20, wherein the methylene blue has a concentration of about 1 mg/100 ml to about 100 mg/100 ml. 23. The solution of claim 20, wherein the paraben has a concentration of about 0.1% to about 0.3% by weight. 24. The solution of claim 22, wherein the paraben has a concentration of about 0.1% to about 0.3% by weight.