Towards Low-Cost Non-Invasive Assessment of Peripheral Vascular Function

Varaki, Elham Shabani; Gargiulo, Giuseppe; Breen, Paul P.

doi:10.1016/j.hlc.2016.06.052

Cited by 4 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…HeMo has been compared with a commercially available plethysmography device, VasoScreen 5000 (medis, Ilmenau, Germany), demonstrating the capability of the prototype to assess both peripheral arterial and venous competence in the leg [ 168 ]. HeMo is a easy to use, low cost device that potentially will require only limited training [ 166 – 168 ]. Moreover, HeMo recordings are calibrated in mL allowing the monitoring of progression or treatment of PAD over time [ 167 ].…”

Section: Emerging Techniquesmentioning

confidence: 99%

Peripheral vascular disease assessment in the lower limb: a review of current and emerging non-invasive diagnostic methods

et al. 2018

View full text Add to dashboard Cite

BackgroundWorldwide, at least 200 million people are affected by peripheral vascular diseases (PVDs), including peripheral arterial disease (PAD), chronic venous insufficiency (CVI) and deep vein thrombosis (DVT). The high prevalence and serious consequences of PVDs have led to the development of several diagnostic tools and clinical guidelines to assist timely diagnosis and patient management. Given the increasing number of diagnostic methods available, a comprehensive review of available technologies is timely in order to understand their limitations and direct future development effort.Main bodyThis paper reviews the available diagnostic methods for PAD, CVI, and DVT with a focus on non-invasive modalities. Each method is critically evaluated in terms of sensitivity, specificity, accuracy, ease of use, procedure time duration, and training requirements where applicable.ConclusionThis review emphasizes the limitations of existing methods, highlighting a latent need for the development of new non-invasive, efficient diagnostic methods. Some newly emerging technologies are identified, in particular wearable sensors, which demonstrate considerable potential to address the need for simple, cost-effective, accurate and timely diagnosis of PVDs.Electronic supplementary materialThe online version of this article (10.1186/s12938-018-0494-4) contains supplementary material, which is available to authorized users.

show abstract

Section: Emerging Techniquesmentioning

confidence: 99%

Peripheral vascular disease assessment in the lower limb: a review of current and emerging non-invasive diagnostic methods

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Commercially available conductive rubber cord stretch sensors, also known as electro-resistive band (ERB) sensors, are normally used for robotic applications and more recently, they have been used as wearable sensors to capture a range of bio-signals [21][22][23][24][25]. ERB sensors (available from Adafruit, NY, USA) are made of highly elastic carbon black impregnated rubber and are sold with a length of 1 m and a thickness of 2 mm.…”

Section: Introductionmentioning

confidence: 99%

“…More recently, we have explored the use of these sensors in several prototype devices with the intention of measuring cardiac stroke volume, respiration tidal volume [21,22], and changes in peripheral blood flow [23][24][25]. This previous work provided some promising results suggesting that these low-cost ERBs were capable of providing valuable clinical information and could lead to a viable solution for continuous and noninvasive measurement of respiration, cardiac function, and peripheral vascular competence.…”

Section: Introductionmentioning

confidence: 99%

Quantification of a Low-Cost Stretchable Conductive Sensor Using an Expansion/Contraction Simulator Machine: A Step towards Validation of a Noninvasive Cardiac and Respiration Monitoring Prototype

Varaki

Breen

2017

Machines

View full text Add to dashboard Cite

Abstract:The use of wearable sensors in health monitoring is increasing dramatically, largely due to their convenience and low-cost. Understanding the accuracy of any given sensor is paramount to avoid potential misdiagnosis. Commercially available electro-resistive band (ERB) sensors have been integrated into several newly developed wearable devices with a view to using these sensors to monitor a range of respiratory and cardiovascular metrics. Quantification of the ERBs is a necessary to step towards validation of these prototypes, as it provides valuable information, which could be exploited for compensation and ultimately, for improvement of their performance. Here, we present an analysis of the ERB sensors using an expansion/contraction simulator machine. Using the developed rig, the characteristics of four ERBs were compared with a linear displacement sensor (string potentiometer) during continuous use over the course of four-and-a-half days to investigate the error and nonlinearity of the ERBs. The analysis of the recorded data includes calculation and comparison of the total harmonic distortions of the two sensors to quantify ERB nonlinearity. Moreover, comparisons between the peak-to-peak voltages and signal-to-noise ratios of the ERB and string potentiometer demonstrate the effect nonlinearity on these factors. This paper demonstrates the nonlinearity of ERBs and highlights the implications for their use in practice.

show abstract

“…Using these special-purpose materials in wearable devices for health monitoring systems takes advantage of their flexibility and durability. Similarly, they have been used in robotics application for measuring displacement and force [21][22][23][24][25][26]. A thin cut from these materials produces an electro-resistive band (ERB), and ERB basically functions as distributed strain gauge with a gauge factor varying according to the speed of stretching, size and is also function of any additional protective coating.…”

mentioning

confidence: 99%

Characterisation of Morphic Sensors for Body Volume and Shape Applications

Arja

Jayarathna

Naik

et al. 2019

Sensors

View full text Add to dashboard Cite

Stretchable conductive materials are originally conceived as radio frequency (RF) and electromagnetic interference (EMI) shielding materials, and, under stretch, they generally function as distributed strain-gauges. These commercially available conductive elastomers have found their space in low power health monitoring systems, for example, to monitor respiratory and cardiac functions. Conductive elastomers do not behave linearly due to material constraints; hence, when used as a sensor, a full characterisation to identify ideal operating ranges are required. In this paper, we studied how the continuous stretch cycles affected the material electrical and physical properties in different embodiment impressed by bodily volume change. We simulated the stretch associated with breathing using a bespoke stress rig to ensure reproducibility of results. The stretch rig is capable of providing constant sinusoidal waves in the physiological ranges of extension and frequency. The material performances is evaluated assessing the total harmonic distortion (THD), signal-to-noise ratio (SNR), correlation coefficient, peak to peak (P-P) amplitude, accuracy, repeatability, hysteresis, delay, and washability. The results showed that, among the three controlled variables, stretch length, stretch frequency and fabric width, the most significant factor to the signal quality is the stretch length. The ideal working region is within 2% of the original length. The material cut in strips of >3 mm show more reliable to handle a variety of stretch parameter without losing its internal characteristics and electrical properties.Sensors 2020, 20, 90 2 of 35 services to achieve a pervasive response [7]. Even with the current state-of-the-art technologies, end sensors remain moderately larger in size, cumbersome to use and unsuitable for long-term monitoring. Sleep studies are a good example scenario where long-term vital parameter monitoring is paramount. The sleep monitoring system should provide minimum intrusion to sleep [8,9]; however, the t current state-of-the-art Polysomnography (PSG) [10] is time-consuming, expensive, limited to in-clinic and provides minimum comfort. The alternative at-home portable sleep study devices use the same conventional sensors in smaller package. A radical change in sensor technologies required to make vital monitoring devices comfortable and "invisible" to the user. The rise of "invisibles" targets making wearable devices built into the commodities people use daily, such as clothes, shoes and jewellery [11]. Usage of the correct type of sensors would enable low-cost implementations that can be embedded in day-to-day clothes that facilitate long-term monitoring [12].Recently, many sensors suitable for tidal monitoring have been presented [13][14][15][16][17]. Electro-resistive sensors based on carbon polymers have shown a great potential for biomedical sensors, and specifically wearable sensors [18], and bio-impedance monitoring [19]. Electro-resistive sensors are made by re-purposing electromagnetic interfer...

show abstract

Towards Low-Cost Non-Invasive Assessment of Peripheral Vascular Function

Cited by 4 publications

References 0 publications

Peripheral vascular disease assessment in the lower limb: a review of current and emerging non-invasive diagnostic methods

Peripheral vascular disease assessment in the lower limb: a review of current and emerging non-invasive diagnostic methods

Quantification of a Low-Cost Stretchable Conductive Sensor Using an Expansion/Contraction Simulator Machine: A Step towards Validation of a Noninvasive Cardiac and Respiration Monitoring Prototype

Characterisation of Morphic Sensors for Body Volume and Shape Applications

Contact Info

Product

Resources

About