Electrochemically reactive cathodes for an electrotransport device
First Claim
1. A method of making a cathodic electrode assembly for an electrotransport device for delivering or sampling an agent through a body surface, the method comprising:
- forming a solid silver halide cathodic electrode from silver halide particles, said electrode comprising at least 95 vol. % silver halide, the electrode having an organic material content of less than 1 vol. % and being substantially free of any electrically conductive filler which absorbs cathodic electrolyte reservoir formulation materials;
wherein said electrode has a discharge capacity of at least 500 mAhr/cm3; and
providing a cathodic electrolyte reservoir wherein said electrolyte reservoir is positioned adjacent to and in ion transmitting relation with the electrode, the electrolyte reservoir while in use being positioned intermediate the electrode and the body surface, and in ion transmitting relation with the body surface.
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Accused Products
Abstract
The present invention relates generally to improved cathodes (24) for use in an electrotransport device (10) for transdermally or transmucosally delivering a beneficial agent (e.g., a drug) to, or extracting a body analyte (e.g., glucose) from, the body surface of a patient. Most particularly, the present invention relates to a cathodic electrode (24) in the form of a silver halide foil which can be made, e.g., by forging particulate silver chloride. The cathode (24) does not absorb agent (e.g., drug), eliminates the need for binders, solvents and processing aids during the manufacturing process, and increases dimensional freedom of design.
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Citations
15 Claims
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1. A method of making a cathodic electrode assembly for an electrotransport device for delivering or sampling an agent through a body surface, the method comprising:
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forming a solid silver halide cathodic electrode from silver halide particles, said electrode comprising at least 95 vol. % silver halide, the electrode having an organic material content of less than 1 vol. % and being substantially free of any electrically conductive filler which absorbs cathodic electrolyte reservoir formulation materials;
wherein said electrode has a discharge capacity of at least 500 mAhr/cm3; and
providing a cathodic electrolyte reservoir wherein said electrolyte reservoir is positioned adjacent to and in ion transmitting relation with the electrode, the electrolyte reservoir while in use being positioned intermediate the electrode and the body surface, and in ion transmitting relation with the body surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification