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Bidirectional Venturi Flowmeter Based on Capacitive Sensors for Spirometry

https://doi.org/10.1002/admt.202300627

Becerra, Laura_L; Rafeedi, Tarek; Ramanarayanan, Sankaran; Frankel, Ian; Miller, Juliana; Chen, Alexander_X; Qie, Yi; Lipomi, Darren_J; Garudadri, Harinath; Ng, Tse_Nga (July 2023, Advanced Materials Technologies)

Abstract In this work, a portable venturi tube capable of measuring bidirectional respiratory flow is developed and correlated the measurements to pulmonary function. Pressure signals are transduced using flexible and compressible capacitive foam sensors embedded into the wall of the device. In this configuration, the sensors are able to provide differential pressure readings, from which the airflow rate passing through the tube could be extrapolated. Utilizing the venturi effect, the geometry of the spirometer tube is designed through finite element analysis to measure respiratory airflow during inhalation and exhalation. The device tube is 3D‐printed and used to measure tidal breathing and deep breathing, along with peak expiratory flow rates, on a healthy individual. This spirometer design allows for easy‐to‐use point‐of‐care diagnoses and has the potential to improve the care of respiratory illnesses.
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Longitudinal monitoring of hypertonia through a multimodal sensing glove

https://doi.org/10.1016/j.bios.2024.116829

Liu, Jiaxi; Verrett, Mya; Wieand, Alyssa; Burch, Anna; Jeon, Ariel; Collins, John; Yalcin, Cagri; Garudadri, Harinath; Skalsky, Andrew J; Ng, Tse Nga (January 2025, Biosensors and Bioelectronics)

Free, publicly-accessible full text available January 1, 2026
Instrumented Glove Assessment of Asymmetric Spasticity Progression

https://doi.org/10.1109/IFETC57334.2023.10254916

Liu, Jiaxi; Skalsky, Andrew J.; Wieand, Alyssa; Jensen, Anna; Yalcin, Cagri; Verrett, Mya; Garudadri, Harinath; Ng, Tse Nga (August 2023, IEEE)
Multimodal assessment of spasticity using a point-of-care instrumented glove to separate neural and biomechanical contributions

https://doi.org/10.1016/j.isci.2022.105286

Amit, Moran; Yalcin, Cagri; Liu, Jiaxi; Skalsky, Andrew J.; Garudadri, Harinath; Ng, Tse Nga (November 2022, iScience)

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Stretchable Textile Bands for Ambulatory Electrocardiogram and Oximetry

https://doi.org/10.1109/JFLEX.2022.3220138

Liu, Jiaxi; Le, Thy; Sadatian, Ellie; Yao, Lulu; Garudadri, Harinath; Dunphy, Stephen A.; McClung, Christian; Ng, Tse Nga (October 2022, IEEE Journal on Flexible Electronics)

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