Evaluation of blood pressure using a flexible and wearable capacitive pressure sensor

Bijender,; Kumar, Shubham; Soni, Amit; Kumar, Ashok

doi:10.1039/d3ra06447f

Cited by 3 publications

(3 citation statements)

References 63 publications

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“…131 The same group also reported similar studies using a porous dielectric layered and a meso-structured capacitive sensor. 132,133 Since these oscillometric-based devices have an inflatable upper arm cuff, which makes the device bulky and limits its operation, the oscillometric approach has been scaled down into various factors and implemented into wearable devices. 129 Therefore companies are developing wrist cuff-type wearable BP monitors in which the radial artery is occluded.…”

Section: Recent Developments In Bp Measurement Technologiesmentioning

confidence: 99%

Blood pressure measurement techniques, standards, technologies, and the latest futuristic wearable cuff-less know-how

Kumar,

Yadav,

Kumar

2024

Sens. Diagn.

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Section: Recent Developments In Bp Measurement Technologiesmentioning

confidence: 99%

Blood pressure measurement techniques, standards, technologies, and the latest futuristic wearable cuff-less know-how

Kumar,

Yadav,

Kumar

2024

Sens. Diagn.

Self Cite

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“…Flexible and wearable pressure sensors are crucial in numerous applications, including artificial intelligence, − monitoring human health, − medical diagnosis, − and man-machine interface. − They are easily attached to the human body due to high flexibility and collect data from the human body correctly and efficiently to provide complete information about the cardiovascular system, including BP, PR, and information on physiological movements . Every pressure sensor works with a different sensing method and typically functions as a transducer to transform applied pressure into an electrical signal.…”

Section: Introductionmentioning

confidence: 99%

“… 33 − 35 They are easily attached to the human body due to high flexibility and collect data from the human body correctly and efficiently to provide complete information about the cardiovascular system, including BP, PR, and information on physiological movements. 36 Every pressure sensor works with a different sensing method and typically functions as a transducer to transform applied pressure into an electrical signal. They are classified into four types based on the sensing mechanism: capacitive, 37 − 41 piezo-resistive, 42 − 47 piezo-electric, 48 − 50 and triboelectric 51 − 53 pressure sensors.…”

Section: Introductionmentioning

confidence: 99%

Noninvasive Blood Pressure Monitoring via a Flexible and Wearable Piezoresistive Sensor

Bijender,

Kumar,

Soni

et al. 2024

ACS Omega

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In the present global context, continuous blood pressure (BP) monitoring is paramount in addressing the global mortality rates attributed to hypertension. Achieving precise insights into the human cardiovascular system necessitates accurate measurement of BP, and the accuracy depends on the faithful recording of oscillations or pulsations. This task ultimately depends on the caliber of the pressure sensor embedded in the BP device. In this context, we have fabricated a flexible resistive pressure sensor based on reduced graphene oxide (rGO) and a polydimethylsiloxane (PDMS) sponge that is highly flexible and sensitive. The designed device operates effectively with a minimal bias voltage of 500 mV, at which point it showed its maximum relative change in current, reaching approximately 25%. Additionally, the sensing device showed a notable change in resistance values, exhibiting almost 100% change in resistance when subjected to a pressure of 400 mmHg and high sensitivity of 0.27 mmHg −1 . After promising outcomes were obtained during static pressure measurement, the sensor was used for BP monitoring in humans. The sensor accurately traced the oscillometric waveform (OMW) for distinct systolic blood pressure (SBP) and diastolic blood pressure (DBP) combinations to cover a range of medical situations, including hypotension, standard or normal, and hypertension. The values of SBP, DBP, and MAP were derived from the sensor's output using the MAA technique, and the errors in these values concerning the simulator and the traditional BP monitor follow the universal AAMI/ESH/ISO protocols. Bland-Altman (B&A) correlation and scatter plots were used to compare the sensor's results and further validate the proposed sensor. The sensor showed the mean and standard deviation error in the SBP, DBP, and MBP of −0.2 ± 5.9, −0.5 ± 7, and −0.9 ± 4.7 mmHg when compared with the noninvasive blood pressure (NIBP) simulator. The pulse rate (PR) was also calculated from the same OMW for the specified value of 80 beats per minute (bpm) given by the simulator and reported a mean PR value of ∼81 bpm, close to the reference value. The findings show that the flexible resistive sensing device can accurately measure BP and replace the existing sensors of BP devices.

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Recent progress of flexible pressure sensors: from principle, structure to application characteristics

Liu,

Qiu

et al. 2024

Flex. Print. Electron.

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Due to its conformal capability, the flexible pressure sensor has a wide range of applications in wearable devices, health monitoring, human-computer interfaces, and other fields. Sensors designed according to various principles and application scenarios exhibit a variety of good characteristics such as high sensitivity, high transparency, a wide detection limit, and low crosstalk. However, achieving all these exceptional functions within a single sensor is evidently challenging. Therefore, it is prudent to emphasize specific advantageous features depending on the unique usage environments and application scenarios. This paper first describes the classification of flexible pressure sensors based on their working principle, then summarizes the commonly used materials and sensor characteristics, and finally reviews the application characteristics of flexible pressure sensors based on different application fields and scenarios. The bottleneck challenges encountered in the development of flexible pressure sensors are discussed, and the foreseeable development strategy is predicted.

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Evaluation of blood pressure using a flexible and wearable capacitive pressure sensor

Abstract: Performance of developed flexible and wearable sensor in static pressure measurement and in monitoring of human blood pressure (BP).

Cited by 3 publications

References 63 publications

Blood pressure measurement techniques, standards, technologies, and the latest futuristic wearable cuff-less know-how

Blood pressure measurement techniques, standards, technologies, and the latest futuristic wearable cuff-less know-how

Noninvasive Blood Pressure Monitoring via a Flexible and Wearable Piezoresistive Sensor

Recent progress of flexible pressure sensors: from principle, structure to application characteristics

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