| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1999: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1998: ¥900,000 (Direct Cost: ¥900,000)
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| Research Abstract |
This paper describes a new non-invasive and non-restrictive vital bio-measurement method of the pneumatic and/or the air mattress method. An air mattress laid out on the bed, a fine pressure sensor that detects the pressure of the air in the mattress and filters are the components of the system. The human body movements due to such as the cardiobilistram, respiration, snoring, turning over and coughing directly infulence to the pressure and the causes of the movements can be discriminated by the proper filtering.
Firstly, we investigated the pneumatic characteristics of the air in the air mattress via a mathematical model and showed the effective filtering to eliminate the ill pneumatic characteristics and further to discriminate the changes due to various body movement.
Secondly, we treated somewhat practical problems, I.e., noise reduction, human feeling to the air mattress, application of the method to commercially available air cushions or mattress. As the results, this method can be robust to the pressure fluctuation in the mattress due to noises in daily life by properly selecting the cut-off frequencies of the filters. Further the method works under a very thin air mattress such as that the human cannot notice their existence as well as to the variety existing air cushions and mattresses.
Thirdly we investigated how to reduce the bio-measurement data. Finally we caught the heart beating frequency, respiration frequency, occurrences of snoring and occurrences of non-respiration for every minute. The changes in above data for whole night provide the information to estimate the depth of sleep of the last night. Further in the emergent situation such as the non-respiration and non-heart beating and/or the continuation of abnormal body movements, the system can send real time message.
The new pneumatic method is one of the kindest bio-measurement method to any patient.
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