Ultra-conformable strain gauge for analysis of dynamic skin deformation

Kento Yamagishi, Yuma Tetsu,
Toshinori Fujie, Akira Kato,
Mariko Tsukune, Yuya Matsumoto,
Yo Kobayashi, Masakatsu Fujie,
〇Shinji Takeoka

 For developing wearable robot that is controlled by human’s muscle activity, sensors for quantifying the muscle activity are of importance in estimating the human motion intention. There are many researches about detecting motion intention from the bio signal that can measure from the skin surface. However, there are few devices or methods for detecting deformation on the skin surface as the strain information. Conventional strain gauge sensors which have been industrially produced to measure the deformation of metals involve the following problems: sensor’s own weight and rigidity interfere with the original deformation of the subject, and the incomplete contact between the sensor and the biological surface causes inaccurate measurement.

Our collaboration research group has developed conductive polymer (PEDOT:PSS) nanosheets with high adhesiveness and conformability to the biological surface. We confirmed that the conductive nanosheets could change the resistance against the dynamic deformation of the skin.

In this symposium we report that the skin-contact device composed of elastomer (SBS) nanosheets and conductive nanosheets was fabricated and the relationship between deformation (strain) and resistance of the device was investigated by both of thrust and tension test.

The ultra-conformable sensor that minimize the interference with the original dynamics of biological tissues will lead to a dramatic progress of the design of wearable devices for the application in the field of healthcare, sports, and prosthetics.

 

Construction of the ultra-conformable strain gauge