SIGNAL SENSING IN AN IMPLANTED APPARATUS WITH AN INTERNAL REFERENCE
First Claim
1. An apparatus for sensing biological signals from an animal, the apparatus comprising:
- at least one set of electrodes that is adapted to be placed in contact with tissue of the animal at a set of locations to sense biological signals;
a set of insulated conductors connected to the at least one set of electrodes, the set of insulated conductors formed in a configuration adapted to be substantially immune to electromagnetic interference,a network of filters connected to the set of insulated conductors and configured to filter the biological signals and thereby produce filtered biological signals;
an amplifier connected to the network of filters and having an internal voltage reference, the amplifier configured to amplify the filtered biological signals to provide an amplified differential signal;
an energy source for powering at least the amplifier and configured to be substantially free of an externally grounded energy supply external to the animal; and
a signal analysis module configured to receive and analyze the amplified differential signal to determine at least one physiological parameter of the animal.
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Accused Products
Abstract
An implantable apparatus for sensing biological signals from an animal includes at least two electrodes disposed at locations to sense the biological signals. The electrode locations may be internal or external to the animal. Insulated conductors couple the electrodes via a passive network of filters to an instrumentation amplifier that has an internal voltage reference. Thus a sensed biological signal is filtered and amplified to provide an amplified differential signal. A signal analysis module processes amplified differential signal to determine at least one physiological parameter of the animal. The signal analysis module may include a first derivative zero detector for signal transition detection and feature detection and analysis. The apparatus may also comprise a signal presentation module to display amplified signals and physiological parameters associated with those signals.
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Citations
18 Claims
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1. An apparatus for sensing biological signals from an animal, the apparatus comprising:
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at least one set of electrodes that is adapted to be placed in contact with tissue of the animal at a set of locations to sense biological signals; a set of insulated conductors connected to the at least one set of electrodes, the set of insulated conductors formed in a configuration adapted to be substantially immune to electromagnetic interference, a network of filters connected to the set of insulated conductors and configured to filter the biological signals and thereby produce filtered biological signals; an amplifier connected to the network of filters and having an internal voltage reference, the amplifier configured to amplify the filtered biological signals to provide an amplified differential signal; an energy source for powering at least the amplifier and configured to be substantially free of an externally grounded energy supply external to the animal; and a signal analysis module configured to receive and analyze the amplified differential signal to determine at least one physiological parameter of the animal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for sensing biological signals from an animal, the apparatus comprising:
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an electrode pair adapted for implantation in the animal at intravascular locations to sense biological signals; a pair of insulated conductors connected to the at least one electrode pair; a passive network of filters connected to the pair of insulated conductors and configured to filter the biological signals and thereby produce filtered biological signals; an instrumentation amplifier connected to the passive network of filters and having an internal voltage reference, the instrumentation amplifier being configured to amplify the filtered biological signals to produce an amplified signal; and an energy source powering the apparatus without being connected to mains or an isolation transformer of medical equipment; and a signal analysis module configured to analyze the amplified signal. - View Dependent Claims (13, 14)
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15. An apparatus for sensing biological signals from an animal, the apparatus comprising:
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at least one electrode pair disposed at a first set of locations to sense biological signals; a pair of insulated conductors connected to the at least one electrode pair, the pair of insulated conductors being closely spaced to minimize sensitivity to electromagnetic interference; a filter network connected to the pair of insulated conductors and configured to provide a filtered biological signal, the filter network comprising at least one high pass filter and at least one low pass filter, the high pass filter configured to provide AC coupling and the low pass filter configured to provide noise rejection; an internal reference module configured to provide an internal reference voltage; an instrumentation amplifier connected to the filter network, the instrumentation amplifier configured to receive the internal reference voltage, and to amplify the filtered biological signal to provide an amplified biological signal; an energy source powering the apparatus, the energy source configured to be substantially free of a wired connection to an energy supply external to the animal; and a signal analysis module configured to analyze the amplified differential signal to extract at least one physiological parameter of the animal; wherein the apparatus is substantially free of a wired ground connection to a ground external to the apparatus. - View Dependent Claims (16, 17, 18)
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Specification