Extending Porous Silicone Capacitive Pressure Sensor Applications into Athletic and Physiological Monitoring

Xia, Yifeng; Xu, Lei; Chen, Xiao; Kirk, Tim V.

doi:10.3390/s21041119

Cited by 14 publications

(4 citation statements)

References 54 publications

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“…As indicated, the behavior of the template for these loads is close to linear. This result is consistent with the results obtained in preliminary tests of this study, and in the works [ 43 , 44 ]. Regarding work with capacitive plantar insoles, again, the behavior of the sensors in this study coincides with those elaborated in [ 29 , 32 ].…”

Section: Resultssupporting

confidence: 94%

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Smart Shoe Insole Based on Polydimethylsiloxane Composite Capacitive Sensors

Luna-Perejón

Salvador-Domínguez

Perez-Peña

et al. 2023

Sensors

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Nowadays, the study of the gait by analyzing the distribution of plantar pressure is a well-established technique. The use of intelligent insoles allows real-time monitoring of the user. Thus, collecting and analyzing information is a more accurate process than consultations in so-called gait laboratories. Most of the previous published studies consider the composition and operation of these insoles based on resistive sensors. However, the use of capacitive sensors could provide better results, in terms of linear behavior under the pressure exerted. This behavior depends on the properties of the dielectric used. In this work, the design and implementation of an intelligent plantar insole composed of capacitive sensors is proposed. The dielectric used is a polydimethylsiloxane (PDMS)-based composition. The sensorized plantar insole developed achieves its purpose as a tool for collecting pressure in different areas of the sole of the foot. The fundamentals and details of the composition, manufacture, and implementation of the insole and the system used to collect data, as well as the data samples, are shown. Finally, a comparison of the behavior of both insoles, resistive and capacitive sensor-equipped, is made. The prototype presented lays the foundation for the development of a tool to support the diagnosis of gait abnormalities.

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Section: Resultssupporting

confidence: 94%

“…The three materials most commonly used in the literature as dielectrics in capacitive insoles are: PDMS, PVC and Ecoflex. PDMS is the material with the best pressure measurement range, the best sensitivity and the best durability [ 43 , 44 ]. PDMS is a type of silicon-based material which is transparent.…”

Section: Methodsmentioning

confidence: 99%

Smart Shoe Insole Based on Polydimethylsiloxane Composite Capacitive Sensors

Luna-Perejón

Salvador-Domínguez

Perez-Peña

et al. 2023

Sensors

View full text Add to dashboard Cite

show abstract

“…There are a large number of diseases (such as sleep apnea, heart attack, and asthma) that may cause abnormal breathing rates. − The sensor can be fixed on the chest to monitor the respiratory rate. Figure i shows that the tester’s respiratory rate is 24 times/min, which is at the normal range.…”

Section: Resultsmentioning

confidence: 99%

Protrusion Microstructure-Induced Sensitivity Enhancement for Zinc Oxide–Carbon Nanotube Flexible Pressure Sensors

Huang

Jiang

Duan

et al. 2021

ACS Appl. Electron. Mater.

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Carbon nanotubes (CNTs) have broad application prospects in flexible pressure sensors because of their superior mechanical and electrical performance. However, the pressure sensitivity of a pure CNT sensor needs to be enhanced. Herein, a zinc oxide−carbon nanotube (ZnO−CNT) sensor with a protrusion microstructure was prepared to improve the pressure sensitivity of a pure CNT sensor. The results show that the ZnO−CNT sensor achieves a higher pressure sensitivity (8.79 times) than that of the pure CNT sensor. In addition, the ZnO−CNT sensor achieves fast response (125.28 ms), good durability (over 6000 cycles), and a high upper detection limit (up to 422.22 kPa). The enhancement in sensitivity of the ZnO−CNT sensor is explained by the finite element simulation. Benefiting from these characteristics, the ZnO− CNT sensor is expected to be applied in human physiological signs and motion monitoring.

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“…From a bionic point of view, such sensors consist of a flexible surface for contact-based sensing and extract pulse wave data based on modern computer information processing techniques [ 6 ]. Although sensor arrays have obvious advantages in detecting pulses, these advantages are not supported by data [ 7 ]. The common pulse diagnostic methods in TCM include floating, medium, and heavy.…”

Section: Introductionmentioning

confidence: 99%

Assessment Parameters for Arrayed Pulse Wave Analysis and Application in Hypertensive Disorders

Yao

et al. 2022

Evidence-Based Complementary and Alternative Medicine

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Study on the objectivity of pulse diagnosis is inseparable from the instruments to obtain the pulse waves. The single-pulse diagnostic instrument is relatively mature in acquiring and analysing pulse waves, but the pulse information captured by single-pulse diagnostic instrument is limited. The sensor arrays can simulate rich sense of the doctor’s fingers and catch multipoint and multiparameter array signals. How to analyse the acquired array signals is still a major problem in the objective research of pulse diagnosis. The goal of this study was to establish methods for analysing arrayed pulse waves and preliminarily apply them in hypertensive disorders. While a sensor array can be used for the real-time monitoring of twelve pulse wave channels, for each subject in this study, only the pulse wave signals of the left hand at the “guan” location were obtained. We calculated the average pulse wave (APW) per channel over a thirty-second interval. The most representative pulse wave (MRPW) and the APW were matched by their correlation coefficient (CC). The features of the MRPW and the features that corresponded to the array pulse volume (APV) parameters were identified manually. Finally, a clinical trial was conducted to detect these feature performance indicators in patients with hypertensive disorders. The independent-samples t-tests and the Mann–Whitney U-tests were performed to assess the differences in these pulse parameters between the healthy and hypertensive groups. We found that the radial passage (RP) APVh1, APVh3, APVh4, APVh3/h1 (P < 0.01), and APVh4/h1 (P < 0.05) were significantly higher in the hypertensive group than in the healthy group; the intermediate passage (IP) APVh4, APVh3/h1 (P < 0.05), and APVh4/h1 (P < 0.01) and the mean APVh3, APVh3/h1 (P < 0.05), and APVh4/h1 (P < 0.01) were significantly higher in the hypertensive group than in the healthy group, and the ulnar passage (UP) APVh4/h1 (P < 0.05) was clearly elevated in the hypertensive group. These results provide a preliminary validation of this novel approach for determining the APV by arrayed pulse wave analysis. In conclusion, we identified effective indicators of hypertensive vascular function. Traditional Chinese medicine (TCM) pulses comprise multidimensional information, and a sensor array could provide a better indication of TCM pulse characteristics. In this study, the validation of the arrayed pulse wave analysis demonstrates that the APV can reliably mirror TCM pulse characteristics.

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Extending Porous Silicone Capacitive Pressure Sensor Applications into Athletic and Physiological Monitoring

Cited by 14 publications

References 54 publications

Smart Shoe Insole Based on Polydimethylsiloxane Composite Capacitive Sensors

Smart Shoe Insole Based on Polydimethylsiloxane Composite Capacitive Sensors

Protrusion Microstructure-Induced Sensitivity Enhancement for Zinc Oxide–Carbon Nanotube Flexible Pressure Sensors

Assessment Parameters for Arrayed Pulse Wave Analysis and Application in Hypertensive Disorders

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