pH buffered electrode for medical iontophoresis

• US 4,973,303 A
• Filed: 09/05/1989
• Issued: 11/27/1990
• Est. Priority Date: 09/05/1989
• Status: Expired due to Term

• Current Assignee: Encore Medical Asset Corporation (Enovis Corp.)
• Original Assignee: EMPI Incorporated (Enovis Corp.)
• Inventors: Lee, Nina H., Johnson, Michael T. V.
• Primary Examiner(s): Cohen, Lee S.
• Application Number:
  US07/402,880
• Time in Patent Office: 448 Days
• Field of Search: 604/20, 128/798, 128/802, 128/803
• US Class Current: 604/20
• CPC Class Codes: A61N 1/0436 Material of the electrode
• CPC Class Codes: A61N 1/0448 Drug reservoir

Abstract

A pH buffered electrode for receiving electrical energy and producing an electric field. The pH buffered electrode includes a first conductive layer and a pH buffer layer adjacent the first conductive layer. The pH buffer layer includes a pH buffer covalently coupled to an immobilizing material such as resin beads or polymers. The immobilizing material renders the pH buffer immobile in the presence of an electric field and allows H⁺ and OH^- ions to be scavenged.

Claims

1. A pH buffered electrode for receiving electrical energy and producing an electric field, comprising:

a first conductive layer;

a pH buffer layer adjacent the first conductive layer and including;

a pH buffer; and

an immobilizing material for immobilizing the buffer in the presence of the electric field; and

a second conductive layer adjacent the pH buffer layer and opposite the buffer layer from the first conductive layer.

2. The pH buffered electrode of claim 1, wherein the first conductive layer includes metal.

3. The pH buffered electrode of claim 1, wherein the first conductive layer includes carbon rubber.

4. The pH buffered electrode of claim 1, wherein the first conductive layer includes conductive polymer material.

5. The pH buffered electrode of claim 1, wherein the second conductive layer is a medicament reservoir containing an aqueous medicament solution of medicament ions and complementary ions.

6. The pH buffered electrode of claim 1, wherein the second conductive layer includes conductive polymer material.

7. The pH buffered electrode of claim 1, wherein the second conductive layer includes a porous material containing an electrolyte solution.

8. The pH buffered electrode of claim 1, and further comprising:

an electrode covering positioned over the first conductive layer of the electrode and providing structural support and adherence to skin.

9. The pH buffered electrode of claim 8, wherein the electrode covering is an electrically nonconductive, adhesive material.

10. The pH buffered electrode of claim 1, and further comprising:

a terminal for coupling with an electrical power source fastened to the first conductive layer.

11. The pH buffered electrode of claim 1, wherein the immobilizing material includes a resin bead.

12. The pH buffered electrode of claim 11, wherein the immobilized buffer is an acid coupled to the resin bead.

13. The pH buffered electrode of claim 11, wherein the immobilized buffer is a base coupled to the resin bead.

14. The pH buffered electrode of claim 11 and including COO^- groups coupled to the resin bead.

15. The pH buffered electrode of claim 11 and including NH₃⁺ groups coupled to the resin bead.

16. The pH buffered electrode of claim 1, wherein the immobilizing material is a polymer.

17. The pH buffered electrode of claim 16, wherein the immobilized buffer is a acid coupled to the polymer.

18. The pH buffered electrode of claim 16, wherein the immobilized buffer is a base coupled to the polymer.

19. The pH buffered electrode of claim 16, and including COO^- groups coupled to the polymer.

20. The pH buffered electrode of claim 16, and including NH₃^- groups coupled to the polymer.

21. A pH buffered electrode for medical iontophoresis, for receiving electrical energy and producing an electric field, comprising:

a first conductive layer;

a second conductive layer containing an aqueous medicament solution of medicament ions and complementary ions; and

a pH buffer layer between the first conductive layer and the second conductive layer and including;

a pH buffer; and

an immobilizing material for immobilizing the buffer in the presence of the electric field.

22. The pH buffered electrode of claim 21, wherein the first conductive layer includes metal.

23. The pH buffered electrode of claim 21, wherein the first conductive layer includes carbon rubber.

24. The pH buffered electrode of claim 21, wherein the first conductive layer includes conductive polymer material.

25. The pH buffered electrode of claim 22, and further comprising:

a terminal for coupling with an electrical power source fastened to the first conductive layer.

26. The pH buffered electrode of claim 21, wherein the immobilizing material is a resin bead.

27. The pH buffered electrode of claim 26, wherein the immobilized buffer is an acid coupled to the resin bead.

28. The pH buffered electrode of claim 26, wherein the immobilized buffer is a base coupled to the resin bead.

29. The pH buffered electrode of claim 26 and including COO^- groups coupled to the resin bead.

30. The pH buffered electrode of claim 26 and including NH₃⁺ groups coupled to the resin bead.

31. The pH buffered electrode of claim 21, wherein the immobilizing material is a polymer.

32. The pH buffered electrode of claim 31, wherein the immobilized buffer is a acid coupled to the polymer.

33. The pH buffered electrode of claim 31, wherein the immobilized buffer is a base coupled to the polymer.

34. The pH buffered electrode of claim 31, and including COO^- groups coupled to the polymer.

35. The pH buffered electrode of claim 31, and including NH₃⁺ groups coupled to the polymer.

36. The pH buffered electrode of claim 21 and further including an electrically nonconductive adhesive covering extending over one or more of the layers to provide structural support and skin adhesion.

37. A pH buffered electrode for receiving electrical energy and producing an electric field, comprising:

a first conductive layer;

a second conductive layer; and

a pH buffer layer between the first conductive layer and the second conductive layer, and including;

a pH buffer; and

an immobilizing material for immobilizing the buffer in the presence of the electric field.