Patient posture monitoring system based on flexible sensors

Youngsu Cha, Kihyuk Nam, Doik Kim

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)


Monitoring patients using vision cameras can cause privacy intrusion problems. In this paper, we propose a patient position monitoring system based on a patient cloth with unobtrusive sensors. We use flexible sensors based on polyvinylidene fluoride, which is a flexible piezoelectric material. The flexible sensors are inserted into parts close to the knee and hip of the loose patient cloth. We measure electrical signals from the sensors caused by the piezoelectric effect when the knee and hip in the cloth are bent. The measured sensor outputs are transferred to a computer via Bluetooth. We use a custom-made program to detect the position of the patient through a rule-based algorithm and the sensor outputs. The detectable postures are based on six human motions in and around a bed. The proposed system can detect the patient positions with a success rate over 88 percent for three patients.

Original languageEnglish
Article number584
JournalSensors (Switzerland)
Issue number3
Publication statusPublished - 2017 Mar 13
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the KIST flagship program (Project No. 2E27200). The authors would like to thank Hojoon Kim and Jiyeon Seo for their help with the experiments.

Publisher Copyright:
© 2017 by the authors. Licensee MDPI, Basel, Switzerland.


  • Flexible sensor
  • Patient cloth
  • Piezoelectric material
  • Real-time monitoring

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Electrical and Electronic Engineering


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