Portable device for monitoring electrocardiographic signals and indices of blood flow
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Accused Products
Abstract
Embodiments of the present invention are directed to a physiological monitoring device which is configured to record signals that reflect blood flow and/or blood pressure, and which may also record ECG signals. In one embodiment, a portable monitoring device comprises a plurality of impedance electrodes configured to be coupled to a patient'"'"'s body and to generate an AC current with an electrical field to detect local electrical impedance of a portion of the patient'"'"'s body encompassed by the electrical field, the local electrical impedance being a surrogate measure of local blood flow of the portion of the patient'"'"'s body. At least a portion of the portable monitoring device is configured to be insertable subcutaneously into the patient'"'"'s body.
78 Citations
61 Claims
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1-36. -36. (canceled)
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37. A method of monitoring a patient, the method comprising:
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coupling a plurality of impedance electrodes to a patient'"'"'s body to generate an AC current with an electrical field to detect local electrical impedance of a portion of the patient'"'"'s body encompassed by the electrical field, the local electrical impedance being a surrogate measure of local blood flow of the portion of the patient'"'"'s body which exhibits pulsation of blood corresponding to the local electrical impedance between the impedance electrodes; and
inserting at least a portion of a portable monitoring device including the impedance electrodes subcutaneously into the patient'"'"'s body. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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56. A method of monitoring a patient, the method comprising:
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coupling a plurality of impedance electrodes to a patient'"'"'s body to generate an AC current with an electrical field to detect local electrical impedance of a portion of the patient'"'"'s body encompassed by the electrical field;
monitoring a change in the measured local impedance; and
obtaining a pulsatile blood volume change in the portion of the patient'"'"'s body encompassed by the electrical field based on the change in the measured local impedance. - View Dependent Claims (57, 58)
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59. A method of monitoring a patient, the method comprising:
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coupling a plurality of impedance electrodes to a patient'"'"'s body to generate an AC current with an electrical field to detect local electrical impedance of a portion of the patient'"'"'s body encompassed by the electrical field, the local electrical impedance being a surrogate measure of local blood flow of the portion of the patient'"'"'s body;
measuring ECG data of the patient; and
correlating the measured ECG data of the patient with the measured local electrical impedance of the patient as a surrogate measurement of blood flow. - View Dependent Claims (60, 61)
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Specification