Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1997-01-15
1998-11-10
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607137, A61N 104
Patent
active
058337148
ABSTRACT:
An implant device uses tantalum and tantalum pentoxide as a complete system for the conveyance of electrical stimulation pulses from stimulus-forming circuitry contained within an hermetic enclosure to the saline fluids of the cochlea (or other tissue to be stimulated). Internal coupling capacitors are not used, yet the danger of having DC current flow to the saline fluids is eliminated. A preferred embodiment is a cochlear prosthesis comprised of a multiplicity of electrode contacts made from sintered, anodized tantalum, connected via tantalum wire leads to tantalum feedthroughs into the hermetically sealed package containing the stimulus pulse-forming electronic circuitry. One or more counterelectrode contacts (for monopolar or bipolar configurations, respectively) consist of activated iridium, connected via platinum or other noble metal leads to noble metal feedthroughs. When powered-up, the stimulus generating circuit produces a steady polarizing potential of approximately half its maximum output voltage range, which potential is applied as a positive (anodizing) voltage to each tantalum electrode and associated lead and feedthrough, with respect to the activated iridium electrode(s), which act as the reference point for the circuit.
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Product Description, features and diagram of "Implantable Transponder TX1400" from Identification Devices, Inc.
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Evanisko George R.
Kamm William E.
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