Iridium oxide coated electrodes for neural stimulation
First Claim
1. The method of making a neural stimulator having an iridium oxide coated electrode which method includes the steps of,forming an acid/alcohol solution containing at least one dissolved iridium complex by heating Ir(III) trichloride in hydrochloric acid until more than half the solution is evaporated to convert the Ir(III) trichloride to a hexachloroiridate ion, [IrCl6 ]2-,adding alcohol to the solution following evaportion to restore the solution to its original volume,aging the restored acid/alcohol solution to slowly convert the hexachloroiridate ion to a chloroiridate-alcohol complex of Ir(IV),soaking said metallic electrode in the aged acid/alcohol solution for a prolonged period of time so that the electrode metallic surface becomes completely covered with the iridium complexes in the aged acid/alcohol,removing the covered metallic electrode from the aged acid/alcohol solution and drying the latter in air at room temperature,and annealing the dried coated electrode at a temperature sufficiently high for sufficient time to convert the chloroiridate-alcohol complexes deposited on the electrode surface to an oxide of iridium.
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Abstract
A metallic electrode made of platinum, platinum iridium alloy, stainless steel, stainless steel alloys, titanium, titanium alloys, tantalum or tantalum alloys is coated with iridium oxide. Ir(III) trichloride is heated in 5.5M HCl until 75-80% of the solution is evaporated. Isopropyl or ethyl alcohol is added to the evaporated solution to restore the solution to its original volume. This restored acid/alcohol solution is aged for 1-2 weeks. The metallic electrode is soaked in the aged acid/alcohol solution for 16 hours, dried for one hour at room temperature and annealed in air at 320° C. for 80-90 minutes.
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Citations
6 Claims
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1. The method of making a neural stimulator having an iridium oxide coated electrode which method includes the steps of,
forming an acid/alcohol solution containing at least one dissolved iridium complex by heating Ir(III) trichloride in hydrochloric acid until more than half the solution is evaporated to convert the Ir(III) trichloride to a hexachloroiridate ion, [IrCl6 ]2-, adding alcohol to the solution following evaportion to restore the solution to its original volume, aging the restored acid/alcohol solution to slowly convert the hexachloroiridate ion to a chloroiridate-alcohol complex of Ir(IV), soaking said metallic electrode in the aged acid/alcohol solution for a prolonged period of time so that the electrode metallic surface becomes completely covered with the iridium complexes in the aged acid/alcohol, removing the covered metallic electrode from the aged acid/alcohol solution and drying the latter in air at room temperature, and annealing the dried coated electrode at a temperature sufficiently high for sufficient time to convert the chloroiridate-alcohol complexes deposited on the electrode surface to an oxide of iridium.
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