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© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

This work presents a modular approach to the development of strain sensors for large deformations. The proposed method separates the extension and signal transduction mechanisms using a soft, elastomeric transmission and a high-sensitivity microelectromechanical system (MEMS) transducer. By separating the transmission and transduction, they can be optimized independently for application-specific mechanical and electrical performance. This work investigates the potential of this approach for human health monitoring as an implantable cardiac strain sensor for measuring global longitudinal strain (GLS). The durability of the sensor was evaluated by conducting cyclic loading tests over one million cycles, and the results showed negligible drift. To account for hysteresis and frequency-dependent effects, a lumped-parameter model was developed to represent the viscoelastic behavior of the sensor. Multiple model orders were considered and compared using validation and test data sets that mimic physiologically relevant dynamics. Results support the choice of a second-order model, which reduces error by 73% compared to a linear calibration. In addition, we evaluated the suitability of this sensor for the proposed application by demonstrating its ability to operate on compliant, curved surfaces. The effects of friction and boundary conditions are also empirically assessed and discussed.

Details

Title
Decoupling Transmission and Transduction for Improved Durability of Highly Stretchable, Soft Strain Sensing: Applications in Human Health Monitoring
Author
Kight, Ali 1   VIAFID ORCID Logo  ; Pirozzi, Ileana 1 ; Liang, Xinyi 2 ; McElhinney, Doff B 3 ; Han, Amy Kyungwon 4   VIAFID ORCID Logo  ; Dual, Seraina A 5 ; Cutkosky, Mark 2   VIAFID ORCID Logo 

 Department of Bioengineering, Stanford University, Stanford, CA 94305, USA 
 Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA 
 Department of Cardiology, Lucile Packard Children’s Hospital, Stanford University, Stanford, CA 94305, USA 
 Department of Mechanical Engineering, Seoul National University, Seoul 08826, Republic of Korea 
 Department of Biomedical Engineering, KTH Royal Institute of Technology, 11428 Stockholm, Sweden 
First page
1955
Publication year
2023
Publication date
2023
Publisher
MDPI AG
e-ISSN
14248220
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2779550555
Copyright
© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.