Ultrasensitive, passive and wearable sensors for monitoring human muscle motion and physiological signals

Cai, Feng; Yi, Changrui; Liu, Shichang; Wang, Yan; Liu, Lacheng; Liu, Xiaoqing; Xu, Xuming; Wang, Li

doi:10.1016/j.bios.2015.10.062

Cited by 70 publications

(52 citation statements)

References 25 publications

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“…Weight loss technologies continue to advance, and increasingly include passive and continuous monitoring through wearable sensors (e.g., wrist-worn activity monitors and global positioning system (GPS)-enabled smart-phones) that unobtrusively sense and record behaviors (e.g., number of steps, purchasing patterns in food deserts) with little input or awareness from the participant (Cai et al, 2016). Researchers need to be mindful about the immense quantities of data regarding individuals’ behavior patterns and consider the negative impact that potential breaches of privacy and security might have when such large-scale, geocoded data can be linked to personal health behaviors (King et al, 2015).…”

Section: Strengths and Challenges Of Ehealth Weight Management Studiesmentioning

confidence: 99%

Technology-based interventions for weight management: current randomized controlled trial evidence and future directions

et al. 2016

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Obesity is a prevalent health care issue associated with disability, premature morality, and high costs. Behavioral weight management interventions lead to clinically significant weight losses in overweight and obese individuals; however, many individuals are not able to participate in these face-to-face treatments due to limited access, cost, and/or time constraints. Technological advances such as widespread access to the Internet, increased use of smartphones, and newer behavioral self-monitoring tools have resulted in the development of a variety of eHealth weight management programs. In the present paper, a summary of the most current literature is provided along with potential solutions to methodological challenges (e.g., high attrition, minimal participant racial/ethnic diversity, heterogeneity of technology delivery modes). Dissemination and policy implications will be highlighted as future directions for the field of eHealth weight management.

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Section: Strengths and Challenges Of Ehealth Weight Management Studiesmentioning

confidence: 99%

Technology-based interventions for weight management: current randomized controlled trial evidence and future directions

et al. 2016

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“…Figure 4C shows the distinct pulse waveform with similar peaks, demonstrating its versatility in measuring different sites. [52,53] Importantly, the dynamic pulse profile obtained by our sensor was comparable to invasive catheterization methods. Subsequently, we measured the radial pulse waveforms after exercise.…”

Section: Wwwadvmattechnoldementioning

confidence: 65%

“…[52,53] We demonstrated that when attached to the bare skin, the sensor could be used to detect subtle force signals caused by physiological pressure flows, such as the brachial or the radial artery pulse ( Figure 4A). [52,53] We demonstrated that when attached to the bare skin, the sensor could be used to detect subtle force signals caused by physiological pressure flows, such as the brachial or the radial artery pulse ( Figure 4A).…”

Section: Wwwadvmattechnoldementioning

confidence: 99%

Ultrathin and Wearable Microtubular Epidermal Sensor for Real‐Time Physiological Pulse Monitoring

Yeo

et al. 2017

Adv Materials Technologies

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high performance of these sensors, their complicated structures, in many cases, require more expensive and complex production routes, limiting its scalability and reproducibility. [33] Conductive liquids belong to another class of materials suitable for deployment in soft and stretchable sensing platforms. These liquids assume the shape of the microchannels within the soft silicone elastomer due to the weak intermolecular forces of attraction between particles. As such, they are highly patternable and reconfigurable. [34][35][36] Recently, several liquid metals that exist in a fluid state in room temperatures are gaining popularity. Among which, Gallistan and eutectic gallium-indium (eGaIn) are two widely reported electrically conductive liquid metallic alloys that are nontoxic and highly deformable. [37] Microfluidic devices based on the liquid metals have therefore been increasingly employed as wearable pressure sensors, [38] strain sensors, [39] temperature sensors, [40] and even more recently as a thermotherapy platform. [41] However, the macroscopic monolithic film format of microfluidics may not fully meet the requirements of imperceptibility and affect conformability due to many subtle but nonflat topologies on the surface of human skin. Thus, an ultrasensitive tactile sensor that is ultrathin, ultralight, and shape configurable is highly desirable.Here, we report an ultrathin microtubular resistive sensor that is soft, flexible, stretchable, and simple to manufacture. The microtube facilitates the deployment of liquid metallic alloy eGaIn which serves as a thin flexible conduit with excellent electrical conductivity and mechanical deformability. Specifically, by considering the radius and thickness of the microtube, we realize an ultrasensitive liquid-based tactile sensor with high flexibility and durability. The self-sustaining fiber-like shape of the sensor is entirely conformal to human interfaces due to its ability to twist around 3D curvatures and objects. In addition, its tiny footprint of 120 µm in diameter makes it almost imperceptible when worn on bare skin. The results of this work establish an attractive option for imperceptible epidermal healthcare diagnostics and monitoring platform.To achieve sensitive force measurements, we utilize liquid metallic alloy within a tubular structure in a submillimeter regime. Liquid metal core fiber of ≈400 µm inner diameter and ≈100 µm in wall thickness has been previously demonstrated as a strain sensor. [42] However, in our current study, we developed a facile manufacturing strategy to achieve an ultrathin, soft core fiber that was previously unattainable. The fabrication process A flexible, stretchable, soft, and ultrathin wearable microtubular sensor that is highly sensitive to mechanical perturbations is developed. The sensor comprises a unique architecture consisting of a liquid-state conductive element core within a soft silicone elastomer microtube. The microtubular sensor can distinguish forces as small as 5 mN and possesses a high force sensitivity ...

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“…The heartbeat and pulse have relatively small amplitudes, and it requires the sensors to possess high pressure sensitivity and low detection limit in order to obtain the information of heartbeats and pulses . Bai et al reported a membrane‐based TENG that is able to detect the heartbeat, as is shown in Figure a,b .…”

Section: Nontextile Tengs As Self‐powered Health Monitorsmentioning

confidence: 99%

Recent Advances in Triboelectric Nanogenerator‐Based Health Monitoring

Zhang

Kang

et al. 2019

Adv Funct Materials

184

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Health monitoring helps prevent, diagnose, and treat diseases, and has been given more and more attention in recent years. Triboelectric nanogenerators (TENGs) are promising for applications in health monitoring due to their myriad of merits including low cost, simple fabrication, light weight, self-powered property, and wide selection of materials. Here, the recent key research achievements in TENG-based health monitoring are comprehensively reviewed. TENGs have been applied to detect not only motion-based health conditions such as pulse and heartbeat but also nonmotion-based health conditions such as CO 2 concentration and lactate concentration. The design of device structure, sensing mechanism, device performance, advantages and disadvantages of each kind of TENG-based health monitors are discussed. Based on recent progresses, the existing challenges and future prospects for TENG-based health monitoring are also discussed and summarized.

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Ultrasensitive, passive and wearable sensors for monitoring human muscle motion and physiological signals

Cited by 70 publications

References 25 publications

Technology-based interventions for weight management: current randomized controlled trial evidence and future directions

Technology-based interventions for weight management: current randomized controlled trial evidence and future directions

Ultrathin and Wearable Microtubular Epidermal Sensor for Real‐Time Physiological Pulse Monitoring

Recent Advances in Triboelectric Nanogenerator‐Based Health Monitoring

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