873-5 Systolic reflective index: A new parameter to study arterial elasticity

Duprez, Daniel; Whitwam, Wayne; Kaiser, Daniel R.; Finkelstein, Stanley M.; Glasser, Stephen P.; Belalcazar, Andres; Patterson, Robert B.; Cohn, Jay N.

doi:10.1016/s0735-1097(04)92241-3

Cited by 3 publications

(4 citation statements)

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“…The heart rate is about 70 bpm which is consistent with the former pulse signals (Figure g). The above test results clearly demonstrated the potential applications of our devices in noninvasive disease diagnosis and medical monitoring …”

Section: Resultsmentioning

confidence: 55%

“…According to the test result, the heart rate was about 70 beats per minute (bpm) which was in keeping with a healthy adult . Moreover, from the enlarged image of the pulse signals, three subtle peaks P 1 (early systolic peak pressure), P 2 (late systolic peak pressure), and P 3 (diastolic peak pressure) can be observed clearly . The heart rate also can be detected in real‐time by affixing the sensor on the forefinger (Figure a).…”

Section: Resultsmentioning

confidence: 99%

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Multilevel Microstructured Flexible Pressure Sensors with Ultrahigh Sensitivity and Ultrawide Pressure Range for Versatile Electronic Skins

Tang

Gan

et al. 2019

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Flexible pressure sensors as electronic skins have attracted wide attention to their potential applications for healthcare and intelligent robotics. However, the tradeoff between their sensitivity and pressure range restricts their practical applications in various healthcare fields. Herein, a cost‐effective flexible pressure sensor with an ultrahigh sensitivity over an ultrawide pressure‐range is developed by combining a sandpaper‐molded multilevel microstructured polydimethylsiloxane and a reduced oxide graphene film. The unique multilevel microstructure via a two‐step sandpaper‐molding method leads to an ultrahigh sensitivity (2.5–1051 kPa−1) and can detect subtle and large pressure over an ultrawide range (0.01–400 kPa), which covers the overall pressure regime in daily life. Sharp increases in the contact area and additional contact sites caused by the multilevel microstructures jointly contribute to such unprecedented performance, which is confirmed by in situ observation of the gap variations and the contact states of the sensor under different pressures. Examples of the flexible pressure sensors are shown in potential applications involving the detection of various human physiological signals, such as breathing rate, vocal‐cord vibration, heart rate, wrist pulse, and foot plantar pressure. Another object manipulation application is also demonstrated, where the material shows its great potential as electronic skin intelligent robotics and prosthetic limbs.

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Section: Resultsmentioning

confidence: 55%

Section: Resultsmentioning

confidence: 99%

Multilevel Microstructured Flexible Pressure Sensors with Ultrahigh Sensitivity and Ultrawide Pressure Range for Versatile Electronic Skins

Tang

Gan

et al. 2019

Small

180

174

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show abstract

“…The pulse rate was determined to be 77 min −1 from the collected data. Furthermore, the waveform of the pulse including the percussion wave (P1), tidal wave (P2), and diastolic wave (P3) was clearly identified, which could be used for biomedical diagnostics . The breath of a man could be detected by binding the sensors around his abdomen.…”

Section: Resultsmentioning

confidence: 99%

Flexible Pressure Sensors with Wide Linearity Range and High Sensitivity Based on Selective Laser Sintering 3D Printing

Zhang

et al. 2019

Adv Materials Technologies

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applications in electronic skin (E-skin), human-machine interfaces, and healthcare monitoring. [1][2][3][4] Among the various types of sensors employing piezoresistive, [5][6][7] capacitive, [8][9][10] piezoelectric, [11][12][13] and triboelectric [14][15][16] sensing mechanisms, the piezoresistive mechanisms have been intensively investigated due to their high sensitivity, simple structures, easy fabrication, and convenient data processing, resulting in significantly promising commercialization prospects. [17][18][19] To achieve success in practical applications, excellent performances in the pressure range related to human activity and scalable, low-cost, and reproducible manufacturing processes are decidedly required. [20][21][22][23] Piezoresistive pressure sensors based on composite materials consisting of elastic matrixes and conductive fillers have been comprehensively investigated and adopted in commercial applications due to their good performance and compatibility with scalable printing technology. [3,21,24] However, the sensors based on bulk resistance changes generally exhibited poor sensitivity in low pressure ranges, which limited their applications in E-skin or wearable devices. To break the bottleneck, flexible pressure sensors composed of surface microstructures and conductive layers were proposed, in which the signals were typically generated from the variation of the contact resistance. [25,26] The transformed working mechanism greatly promoted the sensitivity up to 10-100 kPa −1 (especially in the low pressure range) and decreased the limit of detection (LOD) to 1 Pa or less. [26][27][28] Nonetheless, for plenty of microstructure-based sensors, the response ranges with high sensitivity were limited to several kPa since the contact areas of the microstructures were easily saturated under small pressure. First, the narrow range would limit their applications in the medium-pressure range [29,30] (10-100 kPa), which is closely related to daily human activity. Second, the background stress that is generated from nontest objects can easily disable a sensor with a narrow sensing range. [31,32] In addition to the sensing range, a linear relationship between the pressure and the electrical signals was typically desired to facilitate data processing. [21,33] Considering that the sensitivity was usually different in the whole range, the available range would be further narrowed down, which set To achieve practical applications of flexible pressure sensors, good performance and scalable manufacturing processes are both desired. Here, flexible pressure sensors with excellent performance are fabricated via selective laser sintering (SLS). Having benefitted from the irregular microstructures generated in the powder sintering process, the sensors exhibit high sensitivity of 55 kPa −1 in a wide linearity range of 100 kPa, and they maintain decent sensitivity (>10 kPa −1 ) over a high-pressure range (100-400 kPa), which is among the best results for flexible pressure sensors. The working mechanism of the sensor...

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“…P 2 was late systolic peak pressure. P 3 normally appeared in diastole region and was referred to as diastolic pulse waveform . The waveform was formed by constitution of the blood pressure from left ventricle contracts and reflect wave from the lower limb, and P 2 / P 1 was defined as radial augmentation index (AI r ) which was used as an index for vascular aging .…”

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confidence: 99%

Solution‐Processed Large‐Area Nanocrystal Arrays of Metal–Organic Frameworks as Wearable, Ultrasensitive, Electronic Skin for Health Monitoring

Dong

Zhen

et al. 2015

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873-5 Systolic reflective index: A new parameter to study arterial elasticity

Cited by 3 publications

References 0 publications

Multilevel Microstructured Flexible Pressure Sensors with Ultrahigh Sensitivity and Ultrawide Pressure Range for Versatile Electronic Skins

Multilevel Microstructured Flexible Pressure Sensors with Ultrahigh Sensitivity and Ultrawide Pressure Range for Versatile Electronic Skins

Flexible Pressure Sensors with Wide Linearity Range and High Sensitivity Based on Selective Laser Sintering 3D Printing

Solution‐Processed Large‐Area Nanocrystal Arrays of Metal–Organic Frameworks as Wearable, Ultrasensitive, Electronic Skin for Health Monitoring

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