JRM Vol.35 No.3 pp. 799-809
doi: 10.20965/jrm.2023.p0799

Development Report:

Excretion Detection Systems with Gas Sensors - Development of Excretion Detection Device with Non-Suction Utilizing Floor Cushion –

Shohei Sugano, Kazushiro Tanimoto, Toshiki Kobayashi, and Yoshimi Ui

aba Inc.
3-30-5 Maebara Higashi, Funabashi, Chiba 274-0824, Japan

November 28, 2022
February 10, 2023
June 20, 2023
excretion detection, care, gas sensor, non-wearing, non-suction

In this paper, we report the development and evaluation of an excretion detection device which is to be used with a cushion. Remarkably, the device does not require air suction and can be used during the daytime. The device can be placed on a chair or wheelchair and used whenever a cared person sits. Reflecting on the views of caregivers and the observations of the cared persons, the device was designed to be as thin and flexible as possible. In experiments to evaluate the response, it was confirmed to respond not only to simulated urine but also to actual excrement. From the results of the clinical experiments, the excretion detection model achieved an accuracy rate of 76%. Although this figure is close to the approximately 80% accuracy rate of an existing product H, it must be kept in mind that this accuracy rate is limited to urination owing to the limited training data in this study. These findings suggest that the device used with a cushion provides a valid means of excretion detection during daytime hours in a non-wearing and non-invasive manner, although its use is currently limited to urination.

Non-suction excretion detection device

Non-suction excretion detection device

Cite this article as:
S. Sugano, K. Tanimoto, T. Kobayashi, and Y. Ui, “Excretion Detection Systems with Gas Sensors - Development of Excretion Detection Device with Non-Suction Utilizing Floor Cushion –,” J. Robot. Mechatron., Vol.35 No.3, pp. 799-809, 2023.
Data files:
  1. [1] Y. Yokosawa, “Develop Excretion Detection System and Prospect for Technology Introduction in Nursing Care Field,” Graduate School of Engineering, Engineering major, Chiba Institute of Technology, 2019 (in Japanese).
  2. [2] Y. Ui, Y. Akiba, S. Sugano, R. Imai, and K. Tomiyama, “Excretion Detection System with Gas Sensor – Proposal and Verification of Algorithm Based on Time-Series Clustering –,” J. Robot. Mechatron., Vol.29, No.2, pp. 353-363, 2017.
  3. [3] Y. Ui, “Excretion Detection System and Excretion Detection Method,” Japan Patent, WO2018158978A1, 2018-09-07, 2018.
  4. [4] S. Sugano, Y. Ui, K. Tanimoto, K. Nakano, and K. Tomiyama, “Excretion Detection Systems with Gas Sensors – Development of Prototype Devices Integrating Sensor and Operation Functions –,” J. Robot. Mechatron., Vol.33, No.4, pp. 814-825, 2021.
  5. [5] H. Nakajima, M. Takahashi, K. Saito, and K. Ito, “Simple urination detection system using RFID,” IEICE Communications Express, Vol.2, No.3, pp. 98-103, 2013.
  6. [6] S. S. Noyori, G. Nakagami, H. Noguchi, T. Mori, and H. Sanada, “A Small 8-Electrode Electrical Impedance Measurement Device for Urine Volume Estimation in the Bladder,” 2021 43rd Annual Int. Conf. of the IEEE Engineering in Medicine & Biology Society (EMBC), pp. 7174-7177, 2021.
  7. [7] K. Shichitani, S. Tanaka, J. Kim, and K. Nakajima, “A Capacitive Sensor that Detects Urination Time and Urine Absorption Volume in Multiple Urinations before Changing a Diaper,” Trans. of Japanese Society for Medical and Biological Engineering, Vol.60, No.2-3, pp. 61-67, 2022.
  8. [8] Y. Ui, K. Tanimoto, and A. Otsuki, “Excretion or flatulence detector,” Japan Patent, JP2021181884A, 2021-11-25, 2021.
  9. [9] Y. Ui and K. Tanimoto, “Excretion confirmation device and excretion confirmation method,” Japan Patent, JP7161166B2, 2022-10-26, 2022.
  10. [10] Y. Ui, “Excretion detection cushion,” Japan Patent, JP2022-163815A, 2022-10-27, 2022.

*This site is desgined based on HTML5 and CSS3 for modern browsers, e.g. Chrome, Firefox, Safari, Edge, Opera.

Last updated on Sep. 29, 2023