Biopotential signal source separation using source impedances
First Claim
1. A cardiac monitoring device for monitoring a heart, comprising:
- a housing;
amplification circuitry provided in the housing, the amplification circuitry configured to have a first amplifier input and a second amplifier input, the first amplifier input having a first input impedance and the second amplifier input having a second input impedance different from the first input impedance;
a first electrode arrangement coupled to the first amplifier input and suitable for coupling to the heart with a first electrode interface impedance;
a second electrode arrangement coupled to the second amplifier input and suitable for coupling to the heart with a second electrode interface impedance; and
a signal processor provided in the housing and coupled to the amplification circuitry, the signal processor configured to separate a cardiac source signal from another physiological source signal using a first composite signal detected at the first input impedance and a second composite signal detected at the second input impedance, the cardiac source signal having a first source impedance associated therewith, and the another physiological source signal having a second source impedance associated therewith different from the first source impedance;
wherein the first electrode interface impedance is smaller than the first and second source impedances, and the second electrode interface impedance is smaller than the first and second source impedances.
1 Assignment
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Accused Products
Abstract
Cardiac methods and devices that separate signals using at least two composite signals acquired at least at two input impedances. A target source impedance may be selected, and a cardiac signal may be separated from composite signals using the selected target source impedance. Medical systems include a cardiac device having a housing that provides amplification circuitry configured to have a first amplifier input impedance and a second amplifier input impedance, such as using two separate circuits or switching between two input impedances. One or more electrode assemblies are coupled to the amplification circuitry. A signal processor is provided in the housing configured to separate a source signal using a first composite signal detected at the first input impedance and a second composite signal detected at the second input impedance. The phase response of the first input amplifier circuit is about equal to that of the second input amplifier circuit.
234 Citations
32 Claims
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1. A cardiac monitoring device for monitoring a heart, comprising:
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a housing; amplification circuitry provided in the housing, the amplification circuitry configured to have a first amplifier input and a second amplifier input, the first amplifier input having a first input impedance and the second amplifier input having a second input impedance different from the first input impedance; a first electrode arrangement coupled to the first amplifier input and suitable for coupling to the heart with a first electrode interface impedance; a second electrode arrangement coupled to the second amplifier input and suitable for coupling to the heart with a second electrode interface impedance; and a signal processor provided in the housing and coupled to the amplification circuitry, the signal processor configured to separate a cardiac source signal from another physiological source signal using a first composite signal detected at the first input impedance and a second composite signal detected at the second input impedance, the cardiac source signal having a first source impedance associated therewith, and the another physiological source signal having a second source impedance associated therewith different from the first source impedance; wherein the first electrode interface impedance is smaller than the first and second source impedances, and the second electrode interface impedance is smaller than the first and second source impedances. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A cardiac monitoring device, comprising:
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a housing; amplification circuitry provided in the housing, the amplification circuitry including a first amplifier having a first amplifier input and a second amplifier having a second amplifier input, the first amplifier input having a first input impedance and the second amplifier input having a second input impedance different from the first input impedance; a first electrode arrangement coupled to the first amplifier input; a second electrode arrangement coupled to the second amplifier input; and a signal processor provided in the housing and coupled to the amplification circuitry, the signal processor configured to separate a source signal using a first composite signal detected at the first input impedance and a second composite signal detected at the second input impedance; wherein each of the first and second amplifiers comprises a sample and hold amplifier. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A cardiac monitoring device for monitoring a heart, comprising:
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a housing; amplification circuitry provided in the housing, the amplification circuitry configured to have a first impedance circuit and a second impedance circuit, the first impedance circuit having a first impedance and the second impedance circuit having a second impedance different from the first impedance; and means for separating a cardiac source signal from another physiological source signal using a first composite signal detected at the first impedance and a second composite signal detected at the second impedance, wherein the second impedance attenuates the cardiac source signal component of the second composite signal relative to the cardiac source signal component of the first composite signal. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification