Rechargeable spinal cord stimulation system
First Claim
1. An implantable stimulator device, comprising:
- a plurality of electrode nodes implantable adjacent to tissue to be stimulated;
programmable current source circuitry configured for sourcing a first one or more output currents respectively to a first one or more of the plurality of electrode nodes, wherein the current source circuitry comprises a plurality of adjustable positive current sources;
programmable current sink circuitry configured for sinking a second one or more output currents respectively from a second one or more of the plurality of electrode nodes, wherein the current sink circuitry comprises a plurality of adjustable negative current sources;
a programmable switch matrix;
control circuitry configured for programming the current source circuitry and the current sink circuitry, such that the a total sum of the first one or more output currents equals a total sum of the second one or more output currents in each of one or more channels, and further configured for programming the switch matrix to selectively couple one or more of the positive current sources respectively to the first one or more of the electrode nodes, and for programming the switch matrix to selectively couple one or more of the negative current sources respectively to the second one or more of the electrode nodes.
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Abstract
A spinal cord stimulation (SCS) system includes multiple electrodes, multiple, independently programmable, stimulation channels within an implantable pulse generator (IPG) which channels can provide concurrent, but unique stimulation fields, permitting virtual electrodes to be realized. The SCS system includes a replenishable power source (e.g., rechargeable battery), that may be recharged using transcutaneous power transmissions between antenna coil pairs. An external charger unit, having its own rechargeable battery can be used to charge the IPG replenishable power source. A real-time clock can provide an auto-run schedule for daily stimulation. An included bi-directional telemetry link in the system informs the patient or clinician the status of the system, including the state of charge of the IPG battery. Other processing circuitry in the IPG allows electrode impedance measurements to be made. Further circuitry in the external battery charger can provide alignment detection for the coil pairs.
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Citations
14 Claims
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1. An implantable stimulator device, comprising:
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a plurality of electrode nodes implantable adjacent to tissue to be stimulated; programmable current source circuitry configured for sourcing a first one or more output currents respectively to a first one or more of the plurality of electrode nodes, wherein the current source circuitry comprises a plurality of adjustable positive current sources; programmable current sink circuitry configured for sinking a second one or more output currents respectively from a second one or more of the plurality of electrode nodes, wherein the current sink circuitry comprises a plurality of adjustable negative current sources; a programmable switch matrix; control circuitry configured for programming the current source circuitry and the current sink circuitry, such that the a total sum of the first one or more output currents equals a total sum of the second one or more output currents in each of one or more channels, and further configured for programming the switch matrix to selectively couple one or more of the positive current sources respectively to the first one or more of the electrode nodes, and for programming the switch matrix to selectively couple one or more of the negative current sources respectively to the second one or more of the electrode nodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification