Monitoring physiological activity using partial state space reconstruction
First Claim
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1. A machine-implemented method comprising:
- obtaining a physiological signal of a biological system of an organism;
generating a transformed signal that is mathematically orthogonal to the physiological signal by applying a frequency-independent transform to the physiological signal;
producing, from the physiological signal and the transformed signal, a partial state space representing dynamics of the biological system, the partial state space being a partial reconstruction of a state space representing system dynamics for the biological system; and
identifying physiological information concerning the organism based on an analysis of signal morphology in the partial state space.
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Abstract
Systems and techniques relating to monitoring physiological activity using partial state space reconstruction. In general, in one aspect, a partial state space is produced using an orthogonal, frequency-independent transform, such as Hilbert transform. The partial state space can then be analyzed using state space techniques to identify physiological information for the biological system. The described techniques can be implemented in a distributed cardiac activity monitoring system, including a cardiac monitoring apparatus, and a QRS detector thereof.
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Citations
51 Claims
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1. A machine-implemented method comprising:
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obtaining a physiological signal of a biological system of an organism;
generating a transformed signal that is mathematically orthogonal to the physiological signal by applying a frequency-independent transform to the physiological signal;
producing, from the physiological signal and the transformed signal, a partial state space representing dynamics of the biological system, the partial state space being a partial reconstruction of a state space representing system dynamics for the biological system; and
identifying physiological information concerning the organism based on an analysis of signal morphology in the partial state space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A software product tangibly embodied in a machine-readable medium, the software product comprising instructions operable to cause data processing apparatus to perform operations comprising:
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obtaining a physiological signal of a biological system of an organism;
generating a transformed signal that is mathematically orthogonal to the physiological signal by applying a frequency-independent transform to the physiological signal;
producing, from the physiological signal and the transformed signal, a partial state space representing dynamics of the biological system, the partial state space being a partial reconstruction of a potential full state space for the biological system; and
identifying physiological information concerning the organism based on an analysis of signal morphology in the partial state space. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A cardiac monitoring apparatus comprising:
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an ECG input element;
a state space transformation component responsive to an output of the ECG input element; and
a QRS identification component responsive to an output of the state space transformation component, the QRS identification component comprising one or more dynamical quantity calculations. - View Dependent Claims (24, 25, 26, 27)
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28. A system comprising:
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an ECG input element;
a state space transformation component responsive to an output of the ECG input element;
a QRS identification component responsive to an output of the state space transformation component, the QRS identification component comprising one or more dynamical quantity calculators; and
an antenna coupled with the QRS identification component and configured to wirelessly transmit physiological information. - View Dependent Claims (29, 30, 31, 32, 33)
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34. A machine-implemented method comprising:
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obtaining a cardiac signal of a heart;
translating the cardiac signal into an embedding space that represents coarse-grained dynamics of the heart, said translating comprising applying Hilbert transform to the cardiac signal; and
employing state space analysis techniques to extract physiological information for the heart from the embedding space. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42)
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43. A software product tangibly embodied in a machine-readable medium, the software product comprising instructions operable to cause one or more data processing apparatus to perform operations comprising:
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obtaining a cardiac signal of a heart;
translating the cardiac signal into an embedding space that represents coarse-grained dynamics of the heart, said translating comprising applying Hilbert transform to the cardiac signal; and
employing state space analysis techniques to extract physiological information for the heart from the embedding space. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51)
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Specification