Extracellular polysaccharide solvating system for treatment of bacterial ear conditions

• US 7,976,873 B2
• Filed: 04/24/2007
• Issued: 07/12/2011
• Est. Priority Date: 05/10/2006
• Status: Active Grant

• Current Assignee: Medtronic Xomed Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Xomed Incorporated (Medtronic Plc)
• Inventors: Myntti, Matthew F., Lewis, Cecil O., Oliver, Dana A.
• Primary Examiner(s): Blanchard; David J
• Assistant Examiner(s): ZISKA, SUZANNE E
• Application Number:
  US11/739,508
• Publication Number:
  US 20070264353A1
• Time in Patent Office: 1,540 Days
• Field of Search: None
• US Class Current: 424/600
• CPC Class Codes: A61K 31/10 Sulfides; Sulfoxides; Sulfones
• CPC Class Codes: A61K 31/19 Carboxylic acids, e.g. valproic acid salicylic acid A61K31/60
• CPC Class Codes: A61K 33/22 Boron compounds
• CPC Class Codes: A61K 33/24 Heavy metals; Compounds thereof
• CPC Class Codes: A61K 33/40 Peroxides
• CPC Class Codes: A61K 45/06 Mixtures of active ingredients without chemical characterisation, e.g. antiphlogistics and cardiaca
• CPC Class Codes: A61P 11/02 Nasal agents, e.g. decongestants
• CPC Class Codes: A61P 11/04 for throat disorders
• CPC Class Codes: A61P 27/02 Ophthalmic agents
• CPC Class Codes: A61P 27/16 Otologicals
• CPC Class Codes: A61P 31/04 Antibacterial agents

Abstract

Chronic otitis media and other bacterial ear conditions may be treated by applying a solvating system containing a metal ion sequestering agent and surfactant to a bacterial biofilm in the middle or inner ear. The solvating system disrupts the biofilm and aids in its removal.

Claims

1. A method for treating chronic otitis media and other bacterial ear conditions, which method comprises:

a) applying an aqueous solvating system comprising a metal ion sequestering agent and greater than 0.2 wt. % cationic or zwitterionic surfactant to a bacterial biofilm comprising an extracellular polysaccharide matrix attached or adhered to at least a portion of the middle or inner ear,

b) detaching, removing or otherwise disrupting at least a part of the biofilm by solvating the extracellular polysaccharide matrix with the solvating system, and then

c) rinsing away the solvating system.

2. A method according to claim 1 wherein the solvating system is applied to at least a portion of the middle ear.

3. A method according to claim 1 comprising applying the solvating system by spraying, lavage, misting, mopping, wicking or dripping.

4. A method according to claim 1 wherein the metal ion sequestering agent comprises a mild acid whose acidity is sufficient to sequester one or more metal ions in the bacteria biofilm but which is not so acidic so as to harm the middle or inner ear portion to which the solvating system is applied.

5. A method according to claim 1 wherein the metal ion sequestering agent comprises a sequestering agent for sodium, calcium or iron.

6. A method according to claim 1 wherein the metal ion sequestering agent comprises a carboxylic acid, diacid, triacid or mixture thereof.

7. A method according to claim 6 wherein the metal ion sequestering agent comprises formic acid, acetic acid, chloroacetic acid, dichloroacetic acid, oxalic acid, oxamic acid, glycolic acid, lactic acid, pyruvic acid, aspartic acid, fumaric acid, maleic acid, succinic acid, iminodiacetic acid, glutaric acid, 2-ketoglutaric acid, glutamic acid, adipic acid, glucuronic acid, mucic acid, nitrilotriacetic acid, salicylic acid, ketopimelic acid, benzoic acid, mandelic acid, chloromandelic acid, phenylacetic acid, phthalic acid, boric acid or mixture thereof.

8. A method according to claim 6 wherein the metal ion sequestering agent comprises citric acid.

9. A method according to claim 1 wherein the surfactant comprises a zwitterionic surfactant.

10. A method according to claim 1 wherein the metal ion sequestering agent is present at a concentration of about 0.01 to about 0.5 M.

11. A method according to claim 1 wherein the surfactant is about 0.3% to about 30% of the solvating system.

12. A method according to claim 1 wherein the solvating system further comprises sufficient buffer so that the solvating system has a pH greater than 5.

13. A method according to claim 1 wherein the solvating system further comprises an antimicrobial agent.

46. A method according to claim 1 wherein the surfactant comprises a cationic surfactant.

14. A method for treating chronic otitis media and other bacterial ear conditions, which method comprises:

a) applying an aqueous solvating system comprising a metal ion sequestering agent, a cationic or zwitterionic surfactant, and sufficient buffer so that the solvating system has a pH greater than 5 to a bacterial biofilm comprising an extracellular polysaccharide matrix attached or adhered to at least a portion of the middle or inner ear,

b) detaching, removing or otherwise disrupting at least a part of the biofilm by solvating the extracellular polysaccharide matrix with the solvating system, and then

c) rinsing away the solvating system.

15. A method according to claim 14 wherein the metal ion sequestering agent comprises a carboxylic acid, diacid, triacid or mixture thereof.

16. A method according to claim 15 wherein the metal ion sequestering agent comprises formic acid, acetic acid, chloroacetic acid, dichloroacetic acid, oxalic acid, oxamic acid, glycolic acid, lactic acid, pyruvic acid, aspartic acid, fumaric acid, maleic acid, succinic acid, iminodiacetic acid, glutaric acid, 2-ketoglutaric acid, glutamic acid, adipic acid, glucuronic acid, mucic acid, nitrilotriacetic acid, salicylic acid, ketopimelic acid, benzoic acid, mandelic acid, chloromandelic acid, phenylacetic acid, phthalic acid, boric acid or mixture thereof.

17. A method according to claim 15 wherein the metal ion sequestering agent comprises citric acid.

18. A method according to claim 14 wherein the solvating system has a pH greater than 5 and less than 8.5.

19. A method according to claim 14 wherein the solvating system further comprises an antimicrobial agent.

44. A method according to claim 14 wherein the surfactant comprises a cationic surfactant.

45. A method according to claim 14 wherein the surfactant comprises a zwitterionic surfactant.

20. A solvating system comprising an aqueous composition containing a metal ion sequestering agent, greater than 0.2 wt. % cationic or zwitterionic surfactant, and an antimicrobial agent, and wherein the composition is on a biofilm comprising an extracellular polysaccharide matrix disposed on tissue within the middle or inner ear and contains sufficient metal ion sequestering agent and sufficient surfactant to solvate such an extracellular polysaccharide matrix.

21. A solvating system according to claim 20 wherein the metal ion sequestering agent comprises a mild acid whose acidity is sufficient to sequester one or more metal ions in the extracellular polysaccharide matrix but which is not so acidic so as to harm the middle or inner ear portion to which the solvating system is applied.

22. A solvating system according to claim 20 wherein the metal ion sequestering agent comprises a sequestering agent for sodium, calcium or iron.

23. A solvating system according to claim 20 wherein the metal ion sequestering agent comprises a carboxylic acid, diacid, triacid or mixture thereof.

24. A solvating system according to claim 23 wherein the metal ion sequestering agent comprises formic acid, acetic acid, chloroacetic acid, dichloroacetic acid, oxalic acid, oxamic acid, glycolic acid, lactic acid, pyruvic acid, aspartic acid, fumaric acid, maleic acid, succinic acid, iminodiacetic acid, glutaric acid, 2-ketoglutaric acid, glutamic acid, adipic acid, glucuronic acid, mucic acid, nitrilotriacetic acid, salicylic acid, ketopimelic acid, benzoic acid, mandelic acid, chloromandelic acid, phenylacetic acid, phthalic acid, boric acid or mixture thereof.

25. A solvating system according to claim 23 wherein the metal ion sequestering agent comprises citric acid.

26. A solvating system according to claim 20 wherein the surfactant comprises a zwitterionic surfactant.

27. A solvating system according to claim 20 wherein the surfactant comprises a cationic surfactant.

28. A solvating system according to claim 20 wherein the antimicrobial agent comprises a chitosan salt, cubic-phase lipid, gallium-containing compound, carboxylic ester, sulfonic acid, active halogen compound, active oxygen compound, organic peroxide, ozone, singlet oxygen generator, phenolic derivative or quaternary ammonium compound.

29. A solvating system according to claim 20 wherein the antimicrobial agent comprises gallium acetoacetonate, gallium bromide, gallium chloride, gallium fluoride, gallium iodide, gallium maltolate, gallium nitrate, gallium nitride, gallium percolate, gallium phosphite, gallium sulfate or mixture thereof.

30. A solvating system according to claim 20 wherein the metal ion sequestering agent is present at a concentration of about 0.01 to about 0.5 M.

31. A solvating system according to claim 20 wherein the surfactant is about 0.5% to about 25% of the solvating system.

32. A solvating system according to claim 20 wherein the solvating system further comprises sufficient buffer so that the solvating system has a pH greater than 5.

33. A solvating system according to claim 32 wherein the solvating system has a pH less than 8.5.

34. A solvating system comprising an aqueous composition containing a metal ion sequestering agent, a cationic or zwitterionic surfactant and sufficient buffer so that the solvating system has a pH greater than 5, and wherein the composition is on a biofilm comprising an extracellular polysaccharide matrix disposed on tissue within the middle or inner ear and contains sufficient metal ion sequestering agent and sufficient surfactant to solvate such an extracellular polysaccharide matrix.

35. A solvating system according to claim 34 wherein the metal ion sequestering agent comprises a carboxylic acid, diacid, triacid or mixture thereof.

36. A solvating system according to claim 35 wherein the metal ion sequestering agent comprises formic acid, acetic acid, chloroacetic acid, dichloroacetic acid, oxalic acid, oxamic acid, glycolic acid, lactic acid, pyruvic acid, aspartic acid, fumaric acid, maleic acid, succinic acid, iminodiacetic acid, glutaric acid, 2-ketoglutaric acid, glutamic acid, adipic acid, glucuronic acid, mucic acid, nitrilotriacetic acid, salicylic acid, ketopimelic acid, benzoic acid, mandelic acid, chloromandelic acid, phenylacetic acid, phthalic acid, boric acid or mixture thereof.

37. A solvating system according to claim 35 wherein the metal ion sequestering agent comprises citric acid.

38. A solvating system according to claim 34 wherein the solvating system has a pH less than 8.5.

39. A solvating system according to claim 34 wherein the solvating system further comprises an antimicrobial agent.

40. A solvating system according to claim 39 wherein the antimicrobial agent comprises gallium acetoacetonate, gallium bromide, gallium chloride, gallium fluoride, gallium iodide, gallium maltolate, gallium nitrate, gallium nitride, gallium percolate, gallium phosphite, gallium sulfate or mixture thereof.

41. A solvating system according to claim 34 wherein the surfactant comprises a cationic surfactant.

42. A solvating system according to claim 34 wherein the surfactant comprises a zwitterionic surfactant.

43. A solvating system according to claim 34 further comprising a steroid.