Non-invasive bio-sensor and system for health monitor

本文介绍了一种新的无创、无限制的气垫法和/或气垫法的生命生物测量方法。铺设在床上的空气床垫、检测床垫内空气压力的精细压力传感器和过滤器是该系统的组成部分。首先，通过数学模型研究了空气床垫中空气的气动特性，证明了有效的过滤方法可以消除空气床垫中空气的不良气动特性，进而区分不同人体运动引起的变化。其次，我们处理了一些实际问题，即降噪，人体对空气床垫的感觉，将该方法应用于商业气垫或床垫。结果表明，通过合理选择滤光片的截止频率，该方法对日常生活中的噪声引起的床垫压力波动具有较强的鲁棒性。此外，该方法适用于非常薄的空气床垫，例如人类无法注意到它们的存在以及现有的气垫和床垫的多样性。第三，我们研究了如何减少生物测量数据。最后统计每分钟的心跳频率、呼吸频率、鼾声次数和无呼吸次数。上述整晚数据的变化，为估计昨晚的睡眠深度提供了信息。此外，在无呼吸、无心跳和/或身体持续异常运动的紧急情况下，该系统还可以实时发送信息。这种新的气动方法是对任何患者都是最友好的生物测量方法之一。

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.