Wearable Wireless Multisensor Health Monitor with Head Photoplethysmograph
First Claim
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1. A system for monitoring human health comprising:
- a wearable torso device comprising a first firmware-programmed microprocessor, a first internal memory, and at least one analog-to-digital converter, disposed to continuously measure at least an electrocardiographic signal from at least two electrodes;
a peripheral device in wireless connectivity with said torso device, comprising a second firmware-programmed microprocessor, a second internal memory, and having at least one light source and a light sensitive element arranged with respect to said light source for quantitatively measuring light from said light source that has passed through subcutaneous tissue when said peripheral device is positioned on skin, thereby providing a photoplethysmographic signal that is communicated to the torso device wirelessly;
wherein by means of automatic execution of firmware in said first and second microprocessorssaid peripheral device is disposed to accumulate data packets of photoplethysmographic signal in a first circular buffer in said first internal memory and periodically transmit at least one data packet to said torso device and upon acknowledgement that the transmitted packet was received by said torso device, to remove the transmitted packet from said first circular buffer;
said torso device is disposed to store said data packets received from said peripheral device in a second circular buffer in said second internal memory, maintain a count of packets received, and remove packets from said second circular buffer upon processing each packet with matched electrocardiographic signal data; and
when the wireless connectivity is interrupted for an extended periodsaid peripheral device is disposed to overwrite an unsent packet with a new packet on a first-in-first-out basis when said first circular buffer is full while said torso device is disposed to generate a packet of null data for matching and processing with electrocardiographic signal data and to increment said packet counter, when said second circular buffer is empty, in order to maintain synchronization of said photoplethysmographic signal with said electrocardiographic signal.
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Abstract
Ambulatory monitoring of human health is provided by a multi-component multi-sensor wireless wearable biosignal acquisition system comprising a torso device and a peripheral device communicating wirelessly, and a mobile phone for receiving collected data and uploading it over cellular network or WiFi to a remote computer for multivariate analysis. Biosignals include EKG and PPG, from which a determination of pulse transit time can be made.
14 Citations
14 Claims
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1. A system for monitoring human health comprising:
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a wearable torso device comprising a first firmware-programmed microprocessor, a first internal memory, and at least one analog-to-digital converter, disposed to continuously measure at least an electrocardiographic signal from at least two electrodes; a peripheral device in wireless connectivity with said torso device, comprising a second firmware-programmed microprocessor, a second internal memory, and having at least one light source and a light sensitive element arranged with respect to said light source for quantitatively measuring light from said light source that has passed through subcutaneous tissue when said peripheral device is positioned on skin, thereby providing a photoplethysmographic signal that is communicated to the torso device wirelessly;
wherein by means of automatic execution of firmware in said first and second microprocessorssaid peripheral device is disposed to accumulate data packets of photoplethysmographic signal in a first circular buffer in said first internal memory and periodically transmit at least one data packet to said torso device and upon acknowledgement that the transmitted packet was received by said torso device, to remove the transmitted packet from said first circular buffer; said torso device is disposed to store said data packets received from said peripheral device in a second circular buffer in said second internal memory, maintain a count of packets received, and remove packets from said second circular buffer upon processing each packet with matched electrocardiographic signal data; and
when the wireless connectivity is interrupted for an extended periodsaid peripheral device is disposed to overwrite an unsent packet with a new packet on a first-in-first-out basis when said first circular buffer is full while said torso device is disposed to generate a packet of null data for matching and processing with electrocardiographic signal data and to increment said packet counter, when said second circular buffer is empty, in order to maintain synchronization of said photoplethysmographic signal with said electrocardiographic signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for monitoring human health comprising:
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a wearable torso device comprising a first firmware-programmed microprocessor, a first internal memory, a first radio and at least one analog-to-digital converter, disposed to measure at least an electrocardiographic signal from at least two electrodes; a peripheral device comprising an enclosure containing a second firmware-programmed microprocessor, a second internal memory, and a second radio; a sensor nodule connected to said enclosure by a flexible electrical cable and containing at least one light source and a light sensitive element arranged with respect to said light source for quantitatively measuring light from said light source that has passed through subcutaneous tissue when said sensor nodule is positioned on skin, to measure a photoplethysmographic signal; and an opaque adhesive patch adapted to cover said nodule and adhere to skin circumferentially around said nodule; and a mobile phone disposed to receive via wireless transmission said electrocardiographic signal and said photoplethysmographic signal. - View Dependent Claims (9, 10)
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11. A method for monitoring a physiological status of a human:
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acquiring a photoplethysmographic signal from the mastoid process of the human using a wearable PPG sensor; acquiring an electrocardiographic signal from the torso of the human using a wearable ECG sensor; wirelessly receiving said photoplethysmographic signal and said electrocardiographic signal in a mobile phone; uploading said signals from said mobile phone to a remote analysis server; determining in said remote analysis server time differences between a first repeating landmark in said electrocardiographic signal and a subsequent second repeating landmark in said photoplethysmographic signal to provide a time series of time differences; and assessing in said remote analysis server a physiological status of the human based on a multivariate residual-based model that uses said time differences as a variable. - View Dependent Claims (12, 13, 14)
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Specification