An Ear-Worn Vital Signs Monitor

He, David Da; Winokur, Eric S.; Sodini, C.G.

doi:10.1109/tbme.2015.2459061

Cited by 91 publications

(70 citation statements)

References 20 publications

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“…These results also pointed out that SNRs agreed with the results taken from ECG signals (Figure 9 and Figure 10), skin–electrode contact impedance (Figure 8), simulation in Comsol (Figure 7), and the electrical conductivity values to realise the effect of GN. Meanwhile, we have also compared acquired ear-lead ECG signals by the proposed GN-based electrode with recently published work by Da He [28] who reported ECG signals obtained by Ag/AgCl gel electrodes using a behind-the-ear device. In the results reported, only R-waves appeared clearly including various noisy data, however, our results clearly identify P-waves, QRS-complex, and T-waves with less noise (see in Figure 11).…”

Section: Resultsmentioning

confidence: 99%

Graphene-Enabled Electrodes for Electrocardiogram Monitoring

Celik

Manivannan

Strudwick³

et al. 2016

Nanomaterials

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The unique parameters of graphene (GN)—notably its considerable electron mobility, high surface area, and electrical conductivity—are bringing extensive attention into the wearable technologies. This work presents a novel graphene-based electrode for acquisition of electrocardiogram (ECG). The proposed electrode was fabricated by coating GN on top of a metallic layer of a Ag/AgCl electrode using a chemical vapour deposition (CVD) technique. To investigate the performance of the fabricated GN-based electrode, two types of electrodes were fabricated with different sizes to conduct the signal qualities and the skin-electrode contact impedance measurements. Performances of the GN-enabled electrodes were compared to the conventional Ag/AgCl electrodes in terms of ECG signal quality, skin–electrode contact impedance, signal-to-noise ratio (SNR), and response time. Experimental results showed the proposed GN-based electrodes produced better ECG signals, higher SNR (improved by 8%), and lower contact impedance (improved by 78%) values than conventional ECG electrodes.

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Section: Resultsmentioning

confidence: 99%

Graphene-Enabled Electrodes for Electrocardiogram Monitoring

Celik

Manivannan

Strudwick³

et al. 2016

Nanomaterials

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“…Additionally, it allowed simplicity of integration with ECG sensors via Bluetooth. We also compared our ear-lead ECG results with recently proposed by Da He [27] who worked to get ECG data using behind-the-ear device (Figure 11a). Figure 11a shows a comparison of ECG results taken from the ear in Da He's work and ours.…”

Section: A Ecg Experimental Resultsmentioning

confidence: 99%

“…Another aim of this paper was to investigate ECG signals when different types of electrodes (gel and dry electrodes) have been placed on different locations on the body, such as chest, ear and arm regions. Moreover, this design is less disrupted by motion artifacts for ear-lead ECG monitoring when compared to the previous work which is done by Da He [27] using two ECG sensors. In the future, this option not only gives flexibility to the patient, but also can give the clinicians to access the physiological data in real time via online access from personal healthcare records.…”

Section: Introductionmentioning

confidence: 93%

Evaluation of a Behind-the-Ear ECG Device for Smartphone Based Integrated Multiple Smart Sensor System in Health Applications

Manivannan¹,

Celik²,

Balachandran³

2016

ijacsa

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Abstract-In this paper, we present a wireless Multiple Smart Sensor System (MSSS) in conjunction with a smartphone to enable an unobtrusive monitoring of electrocardiogram (ear-lead ECG) integrated with multiple sensor system which includes core body temperature and blood oxygen saturation (SpO 2 ) for ambulatory patients. The proposed behind-the-ear device makes the system desirable to measure ECG data: technically less complex, physically attached to non-hair regions, hence more suitable for long term use, and user friendly as no need to undress the top garment. The proposed smart sensor device is similar to the hearing aid device and is wirelessly connected to a smartphone for physiological data transmission and displaying. This device not only gives access to the core temperature and ECG from the ear, but also the device can be controlled (removed and reapplied) by the patient at any time, thus increasing the usability of personal healthcare applications. A number of combination ECG electrodes, which are based on the area of the electrode and dry/non-dry nature of the surface of the electrodes are tested at various locations near behind the ear. The best ECG electrode is then chosen based on the Signal-toNoise Ratio (SNR) of the measured ECG signals. These electrodes showed acceptable SNR ratio of ~20 db, which is comparable with existing tradition ECG electrodes. The developed ECG electrode systems is then integrated with commercially available PPG sensor (Amperor pulse oximeter) and core body temperature sensor (MLX90614) using a specialized micro controller (Arduino UNO) and the results monitored using a newly developed smartphone (android) application.

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“…Several studies based on different technical solutions shows correlation between PTT and BP [5]- [11], but improvements are necessary. Most of the studies measured the time from ECG R-peak to the pulse wave reached a peripheral artery.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method for Continuous, Noninvasive, Cuff-Less Measurement of Blood Pressure: Evaluation in Patients With Nonalcoholic Fatty Liver Disease

Seeberg

Orr

Opsahl

et al. 2017

IEEE Trans. Biomed. Eng.

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Abstract-Objective: One promising approach for a continuous, non-invasive, cuff-less ambulatory BP monitor is to measure the pulse wave velocity or the inversely proportional pulse transit time (PTT), based on electrical and optical physiological measurements in the chest area. A device termed IsenseU-BP+ has been developed for measuring continuous BP, as well as other physiological data. The objective of this paper is to present results from the first clinical evaluation with a wide range of patients. The study was set up to verify whether IsenseU-BP+ can be used to measure raw signals with sufficient quality to derive PTT. Methods: The test protocol, run 23 times on 18 different patients with non-alcoholic fatty liver disease, includes both supine measurement at rest as well as measurements during indoor cycling. Changes in PTT were compared with the BP changes measured using validated reference sensors. Results: IsenseU-BP+ measured signals with good quality during rest on 17 of 18 patients despite the high diversity in age, body shape and BMI. Evaluation during cycling was difficult due to a lack of good reference measurements. Conclusion: IsenseU-BP+ measures PTT with high quality during supine rest and exercise and could therefore be suitable for deriving non-invasive continuous BP, although evaluation during exercise was limited due to inaccurate reference BP measurements. Significance: Continuous, non-invasive measurement of BP would be highly beneficial in a number of clinical settings. Systems currently considered gold-standard for the investigation of hypertension carry considerable limitations which could be overcome by the method proposed here.Index Terms-cuff-less blood pressure, pulse transit time, pulse wave velocity, unobtrusive sensing, hypertension

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An Ear-Worn Vital Signs Monitor

Cited by 91 publications

References 20 publications

Graphene-Enabled Electrodes for Electrocardiogram Monitoring

Graphene-Enabled Electrodes for Electrocardiogram Monitoring

Evaluation of a Behind-the-Ear ECG Device for Smartphone Based Integrated Multiple Smart Sensor System in Health Applications

A Novel Method for Continuous, Noninvasive, Cuff-Less Measurement of Blood Pressure: Evaluation in Patients With Nonalcoholic Fatty Liver Disease

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