Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1995-05-25
1998-07-07
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 55, 607 57, A61N 136, A61N 132, A61F 218, H04R 2500
Patent
active
057761728
ABSTRACT:
An implantable cochlear stimulator (ICS) has eight output stages (212), each having a current source (212B) connected to a pair of electrodes, designated "A" and "B", through respective output coupling capacitors and an electrode switching matrix (212C). An indifferent electrode is connected to each output stage by way of an indifferent electrode switch (212D). The current source generates a precise stimulation current as a function of an analog control voltage. The analog control voltage, in turn, is generated by a logarithmic D/A converter. The D/A converter serially converts data words, received in a data frame from an external source, to respective analog control voltages that are applied sequentially to the current sources of each output stage. An output mode register (208) controls the switching matrix of each stage, as well as the indifferent electrode switch, to configure the electrodes for a desired stimulation configuration, e.g., bipolar stimulation (current flow between the pair of electrodes of the output stage), or monopolar stimulation (current flow between one of the electrodes of the output stage and the indifferent electrode). The voltage at the "A" and "B" electrode of each output stage may be selectively telemetered to the wearable system, as may the current flow through the indifferent electrode, thereby facilitating a measurement of the electrode impedance. The "A" and "B" electrodes of each output stage may be selectively shorted through a high or low resistance in order to discharge the output coupling capacitors.
REFERENCES:
patent: 4267410 (1981-05-01), Forster et al.
patent: 4592359 (1986-06-01), Galbraith
patent: 4947844 (1990-08-01), McDermott
patent: 5531774 (1996-07-01), Schulman et al.
patent: 5569307 (1996-10-01), Schulman et al.
patent: 5571148 (1996-11-01), Loeb et al.
Gord John C.
Schulman Joseph H.
Strojnik Primoz
Whitmoyer David I.
Wolfe James H.
Alfred E. Mann Foundation for Scientific Research
Kamm William E.
Layno Carl H.
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