A low power bioimpedance module for wearable systems

Rossi, Stefano; Pessione, Marco; Radicioni, Valeria; Baglione, Giovanni; Vatteroni, M.; Dario, P.; Torre, Luigi Della

doi:10.1016/j.sna.2015.05.004

Cited by 18 publications

(4 citation statements)

References 25 publications

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“…The accuracy testing showed that both channels of the device are capable of measuring impedance of resistors in the range between 50 Ω to 50 kΩ with relative measurement error below 1.84%. The impedance converter AD5933 has also been used in many studies focused on creating a low-cost impedance measurement device, with uses ranging from bioimpedance of the human body [21,22] and/or plants [23] to the impedance of technical objects for monitoring of corrosion [24,25]. The available studies vary in the analog circuits used for interfacing the AD5933 to the device under test.…”

Section: Discussionmentioning

confidence: 99%

Design and Testing of a Device for Human Limb Multifrequency Comparative Bioimpedance Measurement– Preliminary Study

Schmidt,

Novak,

Raska

et al. 2023

Clin Tech

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Bioimpedance is the ability of biological tissues to impede the flow of electrical current. It is often measured as a means of detecting volume and structural changes in various biological tissues. The purpose of this work was to design a two-channel portable device for measuring multifrequency bioimpedance of human limbs. The device was constructed specifically for evaluation of the bioimpedance measurement as a possible tool for aiding in diagnosis of soft-tissue structural changes in the muscles of human limbs by continuously comparing bioimpedance of one limb to the other. The proposed device is based on impedance converter AD5933. It is designed for noninvasive measurements on the human body with low amplitude alternating current at frequencies between 1 kHz and 100 kHz. The device was tested for electromagnetic compatibility, accuracy and used in laboratory measurements for detection of muscle edema on a bioimpedance model. It is capable of measuring impedance up to 100 kΩ with a relative measurement error below 1.84%.

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Section: Discussionmentioning

confidence: 99%

Design and Testing of a Device for Human Limb Multifrequency Comparative Bioimpedance Measurement– Preliminary Study

Schmidt,

Novak,

Raska

et al. 2023

Clin Tech

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show abstract

“…However, motion artefacts can not be addressed using this technique as they are directly causing impedance variation. An other architecture developed by Rossi et al [45] used a digital version of synchronous detection which exploits the time-frequency domain duality. Instead of using continuous time and analog approach, it uses a sample and hold circuit driven by a phase shifted version of the excitation signal injected in the electrodes.…”

Section: Parametersmentioning

confidence: 99%

A Review of Methods for Non-Invasive Heart Rate Measurement on Wrist

Ferreira

Géhin

Massot

2021

IRBM

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When evaluating general health condition on a patient, heart rate is an essential indicator as it is directly representative of the cardiac system state. Continuous measurement methods of heart rate are required for ambulatory monitoring involved in preliminary diagnostic indicators of cardiac diseases or stroke. The growing number of recent developments in wearable devices is reflective of the increasing demand in wrist-worn activity trackers for fitness and health applications. Indeed, the wrist represents a convenient location in terms of form factor and acceptability for patients. While most commercially-available devices are based on optical methods for heart rate measurement, others methods were also developed, based on various physiological phenomena. This review is focused on heart rate measurement methods located on forearm and more specifically on the wrist. For each method, the physiological mechanism involved is described, and the associated transducers for bio-signal acquisition as well as practical developments and prototypes are presented. Methods are discussed on their advantages, limitations and their suitability for an ambulatory use. More specifically, the superposition of motion artefacts over the signal of interest is one of the largest drawbacks for these methods, when used out of laboratory conditions. As such, artefact reduction techniques proposed in the literature are also presented and discussed.

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“…Impedance measurement is also cheap and straightforward to implement, making it an interesting solution for remote monitoring of physiological parameters in wearable systems. Bio-impedance measurements have applications in body composition measurement in sports, firefighting, military, medicine, respiration analysis, and blood flow [77], [78]. As an example, hemorrhagic shock and hypotension caused by blood circulation in the brain is a significant cause of death [79].…”

Section: Impedance Sensorsmentioning

confidence: 99%

Wearables for the Next Pandemic

Hedayatipour

McFarlane

2020

IEEE Access

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This paper reviews the current state of the art in wearable sensors, including current challenges, that can alleviate the loads on hospitals and medical centers. During the COVID-19 Pandemic in 2020, healthcare systems were overwhelmed by people with mild to severe symptoms needing care. A careful study of pandemics and their symptoms in the past 100 years reveals common traits that should be monitored for managing the health and economic costs. Cheap, low power, and portable multi-modalsensors that detect the common symptoms can be stockpiled and ready for the next pandemic. These sensors include temperature sensors for fever monitoring, pulse oximetry sensors for blood oxygen levels, impedance sensors for thoracic impedance, and other state sensors that can be integrated into a single system and connected to a smartphone or data center. Both research and commercial medically approved devices are reviewed with an emphasis on the electronics required to realize the sensing. The performance characteristics, such as accuracy, power, resolution, and size of each sensor modality are critically examined. A discussion of the characteristics, research challenges, and features of an ideal integrated wearable system is also presented.

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A low power bioimpedance module for wearable systems

Cited by 18 publications

References 25 publications

Design and Testing of a Device for Human Limb Multifrequency Comparative Bioimpedance Measurement– Preliminary Study

Design and Testing of a Device for Human Limb Multifrequency Comparative Bioimpedance Measurement– Preliminary Study

A Review of Methods for Non-Invasive Heart Rate Measurement on Wrist

Wearables for the Next Pandemic

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