International journal of advanced smart convergence

The Institute of Internet, Broadcasting and Communication (한국인터넷방송통신학회)
권호 표지
DOI QR코드

DOI QR Code

The Medical Bed System for Preventing Pressure Ulcer Using the Two-Stage Control

  • Received : 2021.02.14
  • Accepted : 2021.02.20
  • Published : 2021.03.31
Download PDF
⟨ Previous Next ⟩

Abstract

The main cause of ulcer is pressure, which starts to develop when the critical body pressure (32mmHg) is exceeded, and when the critical time elapses, ulcer occurs. In this study, the keyboard mechanism of the medical bed with 4 bar links was adopted, and each key can be controlled vertically. A key has one servo drive and one sensor controller which hasseveral body pressure sensors. The sensor controllers and the servo drives are connected to the main controller by two CAN (Car Are Network) in series, respectively. By reading the maximum body pressure value of each keyboard sensor, and by calculating the error value based on the critical body pressure, the fuzzy controller moves each key so that the total error becomes zero. If the fuzzy controller fails, then it prevents ulcer by lifting and lowering the keys of the bed alternatively within a short time. Thus, the controller operates in two-stage. The validity and effectiveness of the proposed approach have been verified through experiments.

Keywords

References

  1. H.S.Cho, J.C.Ryu, G.S.Kim, M.S.Mun and I.H.Lee, "Analysis of Body Pressure Distribution Characteristics According to the Design Factors of The Air-Cell Mattress for Preventing Decubitus Ulcer", Journal of the Korean Society of Precision Engineering Vol. 21, No. 00, January 2004.
  2. Y.D.Lee, C.Y,Kim, C.J.Chang, M.S.Choi, J.A.Kim and J.Y.Lim, "The Control System of a Medical Robot Bed for Preventing Ulcer", J. of the Convergence on Culture Technology, vol.6, no.3, pp353-359, Aug.31,2020. https://doi.org/10.17703/JCCT.2020.6.3.353
  3. J.A.Kim, Y.D.Lee, H.K.Cho, "The Control System of a Robot Bed for Caring Pressure Ulcer", Int. J. of Advanced Culture Techonology',vol.8,no.3,253-258,2020, DOI https:/doi.org/10.1703/IJACT.2020.8.3.253
  4. Y.D.Lee, C.Y,Kim and M.S.Choi, "Enhancement of 4 Bar Parallelogram Linkage for a Medical Bed", J. of the Convergence on Culture Technology, vol.6, no.1, pp.515-520, Feb.29,2020 https://doi.org/10.17703/JCCT.2020.6.1.515
  5. Fuzzy control programming. Technical report, International Electrotechnical Commision, 1997.
  6. J. Mendel. Fuzzy logic systems for engineering: a tutorial. Proceedings of the IEEE, 83(3):345-377, Mar 1995. https://doi.org/10.1109/5.364485
  7. K.H. Lee, Y.E.Kwon, H.J. Lee, Y.K.Lee, J.H.Seo, O.W.Kwon, S.H.Kang, and D.K. Lee, "Active Body Pressure Relief System with Time-of-Flight Optical Pressure Sensors for Pressure Ulcer Prevention", Sensors 2019, 19, 3862; doi:10.3390/s19183862