Stretch Sensor Technology


Rubber-like Stretchable Strain Sensors

We have been developing “GummiStra”, thin-film-based rubber-like stretchable strain sensors. This technology is used as a component of a textile-based wearable sensing system to detect human motion in real time. GummiStra detects small to large strain (displacement) by sensing changes in resistance. It can precisely detect fine finger motions and muscle movements, and collect strain data, when worn on body surfaces.


Detect Fine Human Motions

With excellent wearability and an affinity for human skin, GummiStra can be used to accurately measure the slightest human movement, such as the bending of joints and movement of muscles. It can be pasted directly on body surfaces. Through joint development with various customers, we can realize unique wearable systems.


Resistive Change Type Strain Sensor Capable of Detecting Small to Large Displacements

GummiStra can measure small to large strain (up to double length) with only a single device. It is not only capable of statically and dynamically detecting small to large strains, but is also thin, lightweight, and easily formed into various shapes. The detection principle of the sensor is resistance change, so it does not require special circuitry. Also, multi-channel systemization can be easily realized.


Sweat and Water Resistant

GummiStra is resistant to sweat and water, and can be used outdoors and while exercising.

How it Works

GummiStra consists of an aligned carbon nanotube sheet that is covered and combined with a special urethane elastomer resin layer. The resistance at both ends increases linearly in response to strain. The detection limit is over 200% (up to double length) strain. In our division, we are investigating the application of this technology to motion detection, such as arm and finger movements when playing a musical instrument.

Future Plans

We aim to apply this system to the detection of human motion, which is difficult to detect with optical motion capture systems.

  • Visualization of workers’ movements at manufacturing sites
  • Visualization of movement of outdoor workers Application to VR and MR video content
  • Concurrent engineering in the development process for the manufacturing industry


Complex-Valued Wavelet Spectrum Analysis of Respiratory Conditions and Its Feasibility in the Detection of Low-Functional Respiration
Yoshikazu Nakajima, Takaaki Sugino, Masashi Kobayashi, Yasuhiro Nakashima, Yohei Wada, Yasuro Okumiya, Koji Yataka, Katsunori Suzuki, Toshihiro Kawase, Shinya Onogi, Kenichi Okubo
MDPI Healthcare
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Use of carbon nanotube sensor for detecting postoperative abnormal respiratory waveforms
Masashi Kobayashi, Yohei Wada, Yasuro Okumiya, Koji Yataka, Katsunori Suzuki, Yasuhiro Nakashima, Hironori Ishibashi, Kenichi Okubo
Jounal of Thoracic Disease
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Device Development for Detecting Thumb Opposition Impairment Using Carbon Nanotube-Based Strain Sensors
Tomoyuki Kuroiwa, Akimoto Nimura, Yu Takahashi, Toru Sasaki, Takafumi Koyama, Atsushi Okawa, Koji Fujita
Sensors 2020, 20(14), 3998
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Rapid-response, widely stretchable sensor of aligned MWCNT/elastomer composites for human motion detection
Katsunori Suzuki, Koji Yataka, Yasuro Okumiya, Shingo Sakakibara, Keisuke Sako, Hidenori Mimura, Yoku Inoue
ACS Sens. 2016, 1, 6, pp. 817–825
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Human interface