Measuring load impedance with active stimulation pulses in an implanted pulse generator
First Claim
1. A method, comprising:
- electrically stimulating a selected region of a body tissue;
obtaining a plurality of voltage signals from designated parts of the body tissue while the selected region of the body tissue is being electrically stimulated;
attenuating a voltage amplitude of at least some of the voltage signals, thereby generating amplitude-attenuated voltage signals;
selecting a subset of the amplitude-attenuated voltage signals to be amplified;
amplifying the subset of the amplitude-attenuated voltage signals differentially to generate an amplifier output; and
determining an impedance associated with the selected region of the body tissue based on the amplifier output.
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Accused Products
Abstract
The present disclosure provides a medical stimulation system that includes a plurality of implantable channels each operable to obtain a voltage signal from a designated area of a body tissue. The medical stimulation system includes an impedance measurement device. The impedance measurement device includes a plurality of attenuators each coupled to a respective one of the channels. The attenuators are each operable to attenuate an amplitude of the voltage signal received from its respectively-coupled channel. The impedance measurement device includes a multiplexing component that receives the amplitude-attenuated voltage signals from each of the attenuators. The multiplexing component selectively outputs two of the amplitude-attenuated voltage signals. The impedance measurement device includes a differential amplifier that receives the two amplitude-attenuated voltage signals outputted from the multiplexing component as a differential input signal. The differential amplifier generates an amplifier output signal that includes at least partially an amplified version of the differential input signal.
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Citations
20 Claims
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1. A method, comprising:
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electrically stimulating a selected region of a body tissue; obtaining a plurality of voltage signals from designated parts of the body tissue while the selected region of the body tissue is being electrically stimulated; attenuating a voltage amplitude of at least some of the voltage signals, thereby generating amplitude-attenuated voltage signals; selecting a subset of the amplitude-attenuated voltage signals to be amplified; amplifying the subset of the amplitude-attenuated voltage signals differentially to generate an amplifier output; and determining an impedance associated with the selected region of the body tissue based on the amplifier output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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delivering electrical pulses to a patient; receiving a plurality of voltage signals from a selected body region of the patient in response to the delivering; generating amplitude-attenuated voltage signals by attenuating a voltage amplitude of at least some of the voltage signals; amplifying a subset of the amplitude-attenuated voltage signals differentially, thereby producing a differential output; and calculating an impedance associated with the selected body region based on the differential output. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method, comprising:
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electrically stimulating a selected region of a body tissue with a plurality of implantable channels; obtaining a plurality of voltage signals from designated parts of the body tissue while the selected region of the body tissue is being electrically stimulated; attenuating, using a plurality of voltage attenuators that are each associated with a respective one of the plurality of voltage signals, a voltage amplitude of at least some of the voltage signals, thereby generating amplitude-attenuated voltage signals; selecting a subset of the amplitude-attenuated voltage signals to be amplified; amplifying the subset of the amplitude-attenuated voltage signals differentially to generate an amplifier output; taking multiple samples of the amplifier output; and determining an impedance associated with the selected region of the body tissue based on the amplifier output, including calculating an imaginary component of the impedance based on the multiple samples.
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Specification