Electrodes, electrode assemblies, methods, and systems for tissue stimulation

• US 4,786,277 A
• Filed: 07/24/1987
• Issued: 11/22/1988
• Est. Priority Date: 11/21/1986
• Status: Expired due to Term

• Current Assignee: Trustees of Boston University
• Original Assignee: Trustees of Boston University
• Inventors: Powers, Whitney R., Sisun, Henry
• Primary Examiner(s): Smith, Ruth S.
• Application Number:
  US07/077,706
• Time in Patent Office: 487 Days
• Field of Search: 128/639, 128/640, 128/642-644, 128/798, 128/803, 128/419 R, 604/20
• US Class Current: 604/20
• CPC Class Codes: A61K 41/00 Medicinal preparations obtained by treating materials with wave energy or particle radiation ; Therapies using these preparations
• CPC Class Codes: A61N 1/0436 Material of the electrode
• CPC Class Codes: A61N 1/044 Shape of the electrode
• CPC Class Codes: A61N 1/0448 Drug reservoir
• CPC Class Codes: A61N 1/18 Applying electric currents by contact electrodes

Abstract

A novel electrode and electrode assembly is provided which preferably uses alternating and direct electrical energy for transdermal delivery of pharmacologically active ligands and for stimulation of tissues in-vivo. Methods and systems are also disclosed which allow a broad range of therapeutic agents to be transmitted to tissues and organs superficially or deep within the body.

Claims

1. An electrode intended for use with a source of energy comprising:

a hydrophilic porous polymeric matrix which supports a confluent aqueous phase and has an initial ohmic resistance not greater than 500 ohms per square inch in the absence of electrically conductive salt solutions above 1.0% in concentration; and

means for conveying energy from the source to said polymeric matrix.

4. The electrode as recited in claim 1, 2 or 3 wherein said polymeric matrix is selected from the group consisting of acrylamide polymers, acrylic acid polymers, methacrylic acid polymers, alkyds, butadienes, carboxylic polymers, cellulose containing products, epoxy products, ethylene oxide polymers and derivatives, fluoropolymers, formaldehyde products, gelatin and gelatin derivatives, inorganic products, natural gums, polyamides, polyimides, polyesters, polyethylene glycol polymers, polyethylamine and derivative products, polysiloxane and derivative products, polyurethane products, polyvinyl alcohol and related products, polyvinyl pyrrolidone and related products, starch and starch derivatives.

5. The electrode as recited in claim 1, 2 or 3 wherein said confluent aqueous phase of said polymeric matrix includes at least one selected from the group consisting of inorganic salts, buffers, and surface active agents.

2. An active electrode comprising:

a source of energy;

a hydrophilic porous polymeric matrix which supports a confluent aqueous phase and has an initial ohmic resistance not greater than 500 ohms per square inch in the absence of electrically conductive salt solutions above 1.0% in concentration; and

means for conveying said energy from said source to said polymeric matrix.

6. The electrode as recited in claim 2 or 3 wherein said energy source in selected from the group consisting of electrical energy, laser light energy, ultrasound energy, microwave energy, and magnetic energy.

3. An electrode assembly comprising:

a source of energy;

a plurality of electrodes, at least one of said electrodes comprising a hydrophilic, porous polymeric matrix which supports a confluent aqueous phase and has an initial ohmic resistance not greater than 500 ohms per square inch in the absence of electrically conductive salt solutions above 1.0% in concentration; and

means for conveying said energy from said source to said electrodes.

7. An active electrode comprising:

a source of sinusoidal electrical energy;

a hydrophilic, porous polymeric matrix which supports a confluent aqueous phase and has an initial ohmic resistance not greater than 500 ohms per square inch in the absence of electrically conductive salt solutions above 1.0% in concentration; and

means for conveying said sinusoidal electrical energy from said source to said polymeric matrix.

10. The electrode as recited in claim 7, 8 or 9 wherein said polymeric matrix further comprises a pharmacologically active ligand.

11. The electrode as recited in claim 7, 8 or 9 wherein said polymeric matrix is selected from the group consisting of acrylamide polymers, acrylic acid polymers, methacrylic acid polymers, alkyds, butadienes, carboxylic polymers, cellulose products, epoxy products, ethylene oxide polymers and derivatives, fluoropolymers, formaldehyde products gelatin and gelatin derivative products, inorganic products, natural gums, polyamides, polyimides, polyesters, polyethylene glycols, polyethylene amine and related products, polysiloxanes and related products, polyurethane products, polyvinyl alcohols and derivatives, polyvinyl pyrrolodine and derivative products, starch and starch derivatives.

12. The electrode as recited in claim 7, 8 or 9 wherein said polymeric matrix comprises hydroxyethyl methacrylate.

13. The electrode as recited in claim 7, 8 or 9 wherein said polymeric matrix comprises N-vinyl pyrrolidone.

8. An active electrode comprising:

a source of galvanic electrical energy;

a hydrophilic, porous polymeric matrix which supports a confluent aqueous phase and has an initial ohmic resistance not greater than 500 ohms per square inch in the absence of electrically conductive salt solutions above 1.0% in concentration; and

means for conveying galvanic electrical energy from said source to said polymeric matrix.

9. An electrode assembly comprising:

a source of electrical energy;

a plurality of electrodes, at least one of said electrodes comprising a hydrophilic, porous polymeric matrix which supports a confluent aqueous phase and has an initial ohmic resistance not greater than 500 ohms per square inch in the absence of electrically conductive salt solutions above 1.0% in concentration; and

means for conveying said energy from said source to said electrodes.

14. The electrode assembly as recited in claim 9 wherein said electrical energy source is selected from the group consisting of sinusoidal and galvanic electrical energy sources.

15. A method for electrical stimulation of the tissues of a subject comprising the steps of:

preparing an electrode assembly comprising a source of electrical energy, a plurality of electrodes, in which at least one of said electrodes comprises a hydrophilic, porous polymeric matrix which supports a confluent aqueous phase and has an initial ohmic resistance not greater than 500 ohms per square inch in the absence of electrically conductive salt solutions above 1.0% in concentration, and means for conveying electrical energy from said source to said polymeric matrix;

placing said electrode assembly onto the tissue of the subject; and

conveying electrical energy to said electrodes.

16. The method for electrical stimulation as recited in claim 15 wherein said electrical energy source is selected from the group consisting of sinusoidal electrical energy and galvanic electrical energy source.

17. The method for electrical stimulation as recited in claim 15 wherein the tissue stimulated comprises nerve tissue.

18. The method for electrical stimulation as recited in claim 15 wherein the tissue stimulated comprises muscle tissue.