Alignment‐Free Liquid‐Capsule Pressure Sensor for Cardiovascular Monitoring

Fan, Xiangyu; Huang, Yan; Ding, Xiaorong; Luo, Ningqi; Li, Chenglin; Zhao, Ni; Chen, Shih‐Chi

doi:10.1002/adfm.201805045

Cited by 55 publications

(39 citation statements)

References 36 publications

(24 reference statements)

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“…To explore their practical applications, we first attached a pressure sensor to the wrist of a healthy subject (27-year-old male) to record the artery pulse signal. A typical artery pulse waveform consists of three distinguishable peaks, that is, P 1 , P 2 , and P 3 , [34,35] as shown clearly in the inset of Figure 5a. A typical artery pulse waveform consists of three distinguishable peaks, that is, P 1 , P 2 , and P 3 , [34,35] as shown clearly in the inset of Figure 5a.…”

Section: Various Human Activities Monitoring and Spatial Pressure Mapmentioning

confidence: 99%

Large‐Area Fabrication of High‐Performance Flexible and Wearable Pressure Sensors

Khan

Ting

et al. 2020

Adv Elect Materials

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Flexible pressure sensors with high sensitivity, broad working range, and good scalability are highly desired for the next generation of wearable electronic devices. However, manufacturing of such pressure sensors still remains challenging. A large‐area compliant and cost‐effective process to fabricate high‐performance pressure sensors via a combination of mesh‐molded periodic microstructures and printed side‐by‐side electrodes is presented. The sensors exhibit low operating voltage (1 V), high sensitivity (20.9 kPa−1), low detection limit (7.4 Pa), fast response/recovery time (23/18 ms), and excellent reliability (over 10 000 cycles). More importantly, they exhibit ultra‐broad working range (7.4–1 000 000 Pa), high tunability, large‐scale production feasibility, and significant advantage in format miniaturization and creating sensor arrays with self‐defined patterns. The versatility of these devices is demonstrated in various human activity monitoring and spatial pressure mapping as electronic skins. Furthermore, utilizing printing methods, a flexible smart insole with a high level of integration for both foot pressure and temperature mapping is demonstrated. The scalable and cost‐effective manufacturing along with the good comprehensive performance of the pressure sensors makes them very attractive for future development of wearable smart devices and human–machine interfaces.

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Section: Various Human Activities Monitoring and Spatial Pressure Mapmentioning

confidence: 99%

Large‐Area Fabrication of High‐Performance Flexible and Wearable Pressure Sensors

Khan

Ting

et al. 2020

Adv Elect Materials

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“…BP is an important physiological indicator that reflects the function of blood vessels in the human body, which is of great significance for clinical monitoring and medical diagnosis [40][41][42] . Unlike traditional BP cuff monitoring, continuous, cuff-less, and noninvasive BP monitoring performed by measuring the pulse wave velocity (PWV) can provide the time resolution required to detect BP fluctuations caused by exercise or mood fluctuations, and is considered an effective and reproducible method for measuring BP.…”

Section: Property Characterization Of the Flexible Sensormentioning

confidence: 99%

Identifying human body states by using a flexible integrated sensor

et al. 2020

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Flexible sensors are required to be lightweight, compatible with the skin, sufficiently sensitive, and easily integrated to extract various kinds of body vital signs during continuous healthcare monitoring in daily life. For this, a simple and low-cost flexible temperature and force sensor that uses only two carbon fiber beams as the sensing layer is reported in this work. This simple, flexible sensor can not only monitor skin temperature changes in real time but can also extract most pulse waves, including venous waves, from most parts of the human body. A pulse diagnostic glove containing three such flexible sensors was designed to simulate pulse diagnostic methods used in traditional Chinese medicine. Wearable equipment was also designed in which four flexible sensors were fixed onto different body parts (neck, chest, armpit, and fingertip) to simultaneously monitor body temperature, carotid pulse, fingertip artery pulse, and respiratory rate. Four important physiological indicators—body temperature (BT), blood pressure (BP), heart rate (HR), and respiratory rate (RR)—were extracted by the wearable equipment and analyzed to identify exercise, excited, tired, angry, and frightened body states.

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“…For example, to avoid surgeries required with implants, flexible sensor technologies are being developed for contact lenses to measure intraocular pressure and detect eye problems . Surface measurements of arterial pulse waves that are indicative of the heart health were demonstrated with different pressure sensors, such as a triboelectric sensor or a liquid‐capsule platform with a resistive sensor . In another use case, muscle vibrations from the vocal cord were recorded using triboelectric pressure sensor or hydrogel resistive sensor .…”

Section: Applications Of Pressure Sensors In Monitoring Body Motionmentioning

confidence: 99%

“…Multimodal systems that combine several sensors types provide comprehensive analyses for vital signs, chemical biomarkers, and musculoskeletal conditions . Comparing pressure signals from arterial pulses and electrocardiograms (ECGs) enable extraction of pulse transit times to determine the systolic blood pressure . Alternatively, the blood flow motion during heart beats can be monitored indirectly in photoplethysmograms (PPGs) which use flexible photodetector technologies .…”

Section: Applications Of Pressure Sensors In Monitoring Body Motionmentioning

confidence: 99%

Flexible Pressure Sensors for Objective Assessment of Motor Disorders

Amit

Chukoskie

Skalsky

et al. 2019

Adv Funct Materials

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Monitoring body motion is relevant to motor control disorders as well as assessment of fine motor skills in child development. Furthermore, motion tracking is necessary for rehabilitation monitoring and injury prevention and benefits both sick and healthy individuals. Flexible pressure sensors based on resistors, capacitors, inductors, or transistors are reviewed in the context of healthcare measurements, ranging from physiological signals to body movement characteristics such as grip and gait. To demonstrate the use of flexible pressure sensors for motor assessment, a touch sensing glove that evaluates fine motor skills in autism research is developed. The results show that autistic children perform fewer taps per minute compared to typically developing children, with larger variations in tap durations. In a second example, a force and motion sensing glove is developed to assess spasticity, a neuromuscular disorder that causes muscle stiffness/resistance and jerky movement. Analyses of force versus velocity show movement-dependent muscle resistance in a patient with spasticity. Through these flexible sensor systems, the shift from subjective scores to objective measurement will promote better diagnosis and dramatically improve the accuracy in tracking patient response to therapy.patients doing certain movements, and then clinicians rank each patient's level according to qualitative descriptions in benchmark classification scales. [12,13] The subjective scores can be inconsistent between raters and do not capture finelevel changes in a patient's progress in response to therapy. Therefore, there is a critical need to tackle the issue of imprecise assessment of motor disorders.With recent advances in flexible sensors and innovations in tactile sensing, [14][15][16][17][18][19] we have new low-cost technologies that are prime to facilitate quantitative evaluation of motor control. This progress report presents current developments in wearable sensor systems applicable to motor disorders, so that consistent, objective metrics become available to accurately track whether a treatment effectively relieves symptoms. The wearable sensors are not limited to placement on patients but can also be worn by clinicians or caregivers to assist them in taking measurements during patient interactions. [20,21] The point-of-care sensor systems will allow frequent monitoring, which is highly desirable to offer a better understanding of the patient's short and long-term response to therapies, to tailor treatment and improve outcome and quality of life for patients.Other reviews [14][15][16][17][18][19] have already extensively covered the flexible materials and devices used in tracking vital signs and electronic skin applications. In light of that, this progress report focuses on the applications in monitoring motor skills, in particular to implement pressure sensor designs for wearable systems with diverse form factors, for instance, gloves, [20,22,23] epidermal tags tags, [24,25] and shoe insoles. [26,27] We will discuss the mechanis...

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Alignment‐Free Liquid‐Capsule Pressure Sensor for Cardiovascular Monitoring

Cited by 55 publications

References 36 publications

Large‐Area Fabrication of High‐Performance Flexible and Wearable Pressure Sensors

Large‐Area Fabrication of High‐Performance Flexible and Wearable Pressure Sensors

Identifying human body states by using a flexible integrated sensor

Flexible Pressure Sensors for Objective Assessment of Motor Disorders

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