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Title:
SLEEPINESS ASSESSMENT DEVICE
Document Type and Number:
WIPO Patent Application WO/2010/143535
Kind Code:
A1
Abstract:
Provided is a sleepiness assessment device that: sets an average heart rate (HR) as a sleepiness determination value (P1) (S130); sets the standard deviation (σ) of a respiration interval (RespI) over the period of one minute as a sleepiness determination value (P2) (S150); sets a value obtained by dividing the summation of the squares of average heartbeat intervals (RRIavg), when a heartbeat interval (RRI) becomes shorter (i.e., when the RRI count value (Xi) is 1), with the period of one minute as a sleepiness determination value (P3) (S190); sets a value obtained by averaging the volatility, when the respiration interval (RespI) becomes longer (i.e., when the RespI count value (Yi) is 1), as a sleepiness determination value (P4) (S210); sets a value obtained by the summation of the products of the sleepiness determination values (P1 to P4) and the respective weight coefficients (a to d), as a sleepiness determination value (P) (S220); determines that a subject is highly alert when the sleepiness determination value (P) is less than 0 (S240); and determines that a subject is less alert when the sleepiness determination value (P) is 0 or more (S250).

Inventors:
YOKOYAMA KIYOKO (JP)
TAKAHASHI ISSEI (JP)
OHASHI HAYATO (JP)
TABATA GENKI (JP)
Application Number:
PCT/JP2010/058904
Publication Date:
December 16, 2010
Filing Date:
May 26, 2010
Export Citation:
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Assignee:
UNIV NAGOYA CITY (JP)
YOKOYAMA KIYOKO (JP)
TAKAHASHI ISSEI (JP)
OHASHI HAYATO (JP)
TABATA GENKI (JP)
International Classes:
A61B5/0245; A61B5/16; A61B5/18; A61B5/11
Foreign References:
JP2004344269A2004-12-09
JP2008161664A2008-07-17
JP2009137551A2009-06-25
Other References:
"Preprints of Meeting on Automotive Engineers", 24 May 2006, article HAJIME TAKADA: "Seiri Joho o Mochiita Untenchu no Kakuseido Hyoka System ni Kansuru Kenkyu", pages: 21 - 26, XP008164875
"Preprints of Meeting on Automotive Engineers", vol. 946, 1 September 1994, article BUNJI ATSUMI: "Shinpaku Keisoku ni yoru Driver no Ishiki Jotai Hyoka", pages: 133 - 136, XP008164885
MITSUO YASUSHI: "Estimating Sleepiness during Expressway Driving", JOURNAL OF INTERNATIONAL SOCIETY OF LIFE INFORMATION SCIENCE, vol. 21, no. 2, 1 September 2003 (2003-09-01), pages 445 - 448, XP008165421
See also references of EP 2441387A1
Attorney, Agent or Firm:
ITEC INTERNATIONAL PATENT FIRM (JP)
Patent business corporation Itec international patent firm (JP)
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