System and methods for wireless body fluid monitoring
First Claim
1. An adherent device to monitor a tissue hydration of a patient, the device comprising:
- an adhesive patch to adhere to a skin of the patient;
at least four electrodes connected to the patch and capable of electrically coupling to the patient; and
circuitry coupled to the at least four electrodes to measure a tissue resistance of the patient at a plurality of frequencies greater than zero, wherein the circuitry is configured to determine the tissue hydration using the measured tissue resistance, and wherein the circuitry is configured to detect a low frequency droop in the tissue resistance and to, when low frequency droop is detected, temporarily suspend data collection based at least in part on the fact that the low frequency droop has been detected.
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Accused Products
Abstract
An adherent device to monitor a tissue hydration of a patient comprises an adhesive patch to adhere to a skin of the patient. At least four electrodes are connected to the patch and capable of electrically coupling to the patient. Impedance circuitry is coupled to the at least four electrodes to measure a tissue resistance of the patient, where the circuitry is configured to determine the tissue hydration in response to tissue resistance. The circuitry may comprise a processor system and the tissue resistance may correspond to a change in patient body fluid. The impedance circuitry is configured to measure the hydration signal using at least one low measurement frequency, which may be in the range of 0 to 10 kHz. Multiple measurement frequencies may be used and the hydration signal may include a tissue reactance measurement.
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Citations
33 Claims
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1. An adherent device to monitor a tissue hydration of a patient, the device comprising:
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an adhesive patch to adhere to a skin of the patient; at least four electrodes connected to the patch and capable of electrically coupling to the patient; and circuitry coupled to the at least four electrodes to measure a tissue resistance of the patient at a plurality of frequencies greater than zero, wherein the circuitry is configured to determine the tissue hydration using the measured tissue resistance, and wherein the circuitry is configured to detect a low frequency droop in the tissue resistance and to, when low frequency droop is detected, temporarily suspend data collection based at least in part on the fact that the low frequency droop has been detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An adherent device to monitor a patient, the device comprising:
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an adhesive patch to adhere to a skin of the patient; at least four electrodes connected to the patch and capable of electrically coupling to the patient at a skin-electrode interface; impedance circuitry coupled to the at least four electrodes to measure a hydration signal of the patient, wherein the impedance circuitry is configured to measure multiple frequencies; and a processor coupled to the impedance circuitry configured to determine a quality of the skin-electrode interface based on multiple measurements of the hydration signal at frequencies below 50 kHz, wherein the processor is configured to measure a low frequency droop in the tissue resistance, and to, when low frequency droop is detected, temporarily suspend data collection based at least in part on the fact that the low frequency droop has been detected. - View Dependent Claims (15, 16)
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17. A method of monitoring a patient, the method comprising:
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adhering an adhesive patch to a skin of the patient to couple at least four electrodes to the skin of the patient to form a skin-electrode interface; measuring a hydration signal of the patient at a plurality of frequencies greater than zero with impedance circuitry coupled to the at least four electrodes, wherein the hydration signal comprises a tissue resistance measurement; detecting a low frequency droop in the tissue resistance measurement; determining a hydration of the patient using the tissue resistance measurement; and temporarily suspending data collection based at least in part on the fact that the low frequency droop has been detected. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method of monitoring a patient, the method comprising:
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adhering an adhesive patch to a skin of the patient to couple at least four electrodes to the skin of the patient to form a skin-electrode interface; measuring a hydration signal of the patient with impedance circuitry coupled to the at least four electrodes, wherein the hydration signal comprises a tissue resistance measurement and a tissue reactance measurement; determining an amount of extracellular edema using the tissue resistance measurement; detecting a low frequency droop in the tissue resistance measurement; and determining a quality of skin-electrode coupling using the tissue reactance measurement and without using the tissue resistance measurement; and temporarily suspending data collection based at least in part on the fact that the low frequency droop has been detected. - View Dependent Claims (31)
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32. An adherent device to monitor a patient, the device comprising:
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an adhesive patch to adhere to a skin of the patient; at least four electrodes mechanically coupled to the patch and capable of electrically coupling to the patient, the at least four electrodes comprising at least two force electrodes and at least two sense electrodes; impedance circuitry electrically coupled to the at least two force electrodes to force an electrical current and coupled to the at least two sense electrodes to measure a hydration signal of the patient, wherein the hydration signal comprises a tissue resistance measurement; and a processor system coupled to the impedance circuitry configured to determine an amount of extracellular edema from the hydration signal, wherein the processor system is configured to calculate and report a patient risk of an adverse cardiac event to at least one of a remote center or a physician based on the amount of extracellular edema; and wherein the processor system is configured to detect a low frequency droop in the tissue resistance measurement; and wherein the processor system is further configured to, when low frequency droop is detected, temporarily suspend data collection based at least in part on the fact that the low frequency droop has been detected.
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33. A method of monitoring a patient, the method comprising:
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adhering an adhesive patch to a skin of the patient so as to couple at least four electrodes to the skin of the patient, the at least four electrodes comprising at least two force electrodes and at least two sense electrodes; measuring a tissue resistance of the patient with impedance circuitry electrically coupled to the at least two force electrodes and to the at least two sense electrodes, such that the force electrodes force an electrical current at a frequency less than 10 kHz between the at least two force electrodes, wherein the impedance circuitry generates a hydration signal; detecting a low frequency droop in the tissue resistance measurement; determining an amount of extracellular edema from the hydration signal; and temporarily suspending data collection based at least in part on the fact that the low frequency droop has been detected.
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Specification