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US 10,537,403 B2Granted
Passive RFID based health data monitor
AssigneeDrexel University
InventorsShrenik Vora, Timothy Kurzweg
Life of this patent
Estimating the term…
Abstract
A wearable, wireless and battery-free continuous health monitor includes an RFID tag used as an On-Off Keying Device to measure the heart rate. The tag's returned signal strength variations are used to calculate the respiration rate. Machine learning algorithms are employed to determine the health parameters.
Claims7
A passive RFID health monitoring device, comprising:
- an antenna for receiving a continuous interrogation signal;
- a passive RFID chip coupled to the antenna comprising:
- a power harvester circuit coupled to the antenna that obtains power from the interrogation signal and converts it to direct current (DC) to provide operating power for at least one other circuit in the passive RFID chip;
- a health data amplifier circuit coupled to the power harvester circuit and having at least one port for receiving a cyclical health data signal from at least one sensor, the health data amplifier circuit operative to receive operating power from the power harvester circuit and use the power to amplify the received cyclical health data signal;
- a data detector circuit coupled to the health data amplifier circuit that receives the amplified cyclical health data signal and detects the occurrence of at least one event of interest in each cycle of the cyclical health data signal, and outputs a signal containing information of each detected event of interest;
- and
- a passive RFID tag coupled to an antenna and operative to output via the antenna a default continuous backscatter signal responsive to the received interrogation signal, the RFID tag coupled to the data detector circuit to receive the signal containing information of each detected event of interest, and further operative to modify the backscatter signal to include at least a portion of the information of each detected event of interest;
- wherein the cyclical health data signal includes at least one electrocardiographic (ECG) signal from at least one ECG sensor operationally coupled to a subject, the ECG signal containing information of the condition of the subject's heart;
- wherein the event of interest is the occurrence of the peak of a QRS Complex (R) in each cycle of the ECG signal;
- wherein the data detector is a heart rate detector that detects the peak of the R event in each cycle, the heart rate detector configured to output a pulsed binary waveform that switches from a first value to a second value when it detects the peak of the R event, remains at the second value for a predetermined duration, and returns to the first state at the end of the predetermined duration.
7 more elements
A passive RFID health monitoring device, comprising:
- an antenna for receiving a continuous interrogation signal;
- a passive RFID chip coupled to the antenna comprising:
- a power harvester circuit coupled to the antenna that obtains power from the interrogation signal and converts it to direct current (DC) to provide operating power for at least one other circuit in the passive RFID chip;
- a health data amplifier circuit coupled to the power harvester circuit and having at least one port for receiving a cyclical health data signal from at least one sensor, the health data amplifier circuit operative to receive operating power from the power harvester circuit and use the power to amplify the received cyclical health data signal;
- a data detector circuit coupled to the health data amplifier circuit that receives the amplified cyclical health data signal and detects the occurrence of at least one event of interest in each cycle of the cyclical health data signal, and outputs a signal containing information of each detected event of interest;
- and
- a passive RFID tag coupled to an antenna and operative to output via the antenna a default continuous backscatter signal responsive to the received interrogation signal, the RFID tag coupled to the data detector circuit to receive the signal containing information of each detected event of interest, and further operative to modify the backscatter signal to include at least a portion of the information of each detected event of interest;
- wherein the RFID tag uses on-off keying (OOK) to transmit heart rate such that the RFID tag is turned on by default, and turned off when the signal containing information of each detected event of interest is detected;
- wherein the cyclical health data signal includes at least one electrocardiographic (ECG) signal from at least one ECG sensor operationally coupled to a subject, the ECG signal containing information of the condition of the subject's heart;
- wherein the event of interest is the occurrence of the peak of a QRS Complex (R) in each cycle of the ECG signal;
- wherein the data detector is a heart rate detector that detects the peak of the R event in each cycle, the heart rate detector configured to output a pulsed binary waveform that switches from a first value to a second value when it detects the peak of the R event, remains at the second value for a predetermined duration, and returns to the first state at the end of the predetermined duration.
8 more elements
Dependencies are inferred from the claim text.