北京生物醫(yī)學(xué)工程

基于光-頻率轉(zhuǎn)換器的高精度數(shù)字脈搏血氧儀的設(shè)計

Design of Digital Pulse Oximeter with High Resolution Based on Optical-Frequency Converter

作者：楊濤林宛華翁羽潔楊玲吳小玲

單位：南京醫(yī)科大學(xué)基礎(chǔ)醫(yī)學(xué)院（南京210001）

分類號：

出版年·卷·期（頁碼）：2011·30·1（73-77）

摘要：

針對目前脈搏血氧儀進口成本高、功耗大、抗干擾差、檢測范圍小等問題，本文給出了一種低成本低功耗的數(shù)字脈搏血氧儀設(shè)計方法。采用基于光-頻率轉(zhuǎn)換器的高分辨數(shù)字探頭提高精度和檢測范圍，移植直流跟蹤濾波器去基線漂移提高抗干擾能力，利用上升沿和下降沿檢測脈率算法提高檢測準確率。本設(shè)計在人體小幅運動及手指輕度抖動時，仍能得到穩(wěn)定的脈搏波形和脈率，通過使用Fluke Index2型血氧模擬儀在不同條件下進行重復(fù)實驗，發(fā)現(xiàn)血氧飽和度為35%~100%時精度為1%、弱灌注量小于等于0.2%時精度達到4%；脈率檢測的誤差小于1。表明此設(shè)計在高精度、大范圍、重復(fù)性和抗抖動方面均有所改善,適合于家庭、社區(qū)等醫(yī)用監(jiān)護場合使用。

Due to pulse oximeters have some disadvantages such as high cost of import, high power consumption, poor interference immunization, and small detection range. In this study, we presented a kind of digital pulse oximeter with low cost and power consumption. A digital detector based on light-frequency converter and with high resolution was adopted to improve precision and detection range, A DC tracking filter was used to cancel baseline drift to improve anti-interference ability, and a pulse rate detection algorithm using rising and falling edge was utilized to improve detection accuracy. In this study, stable pulse waveform and pulse rate could still be captured when body moved gently and fingers trembled slightly. After repeating the experiment under different conditions by Fluck Index2 oximeter simulator, we found that the accuracy was 1% when oxygen saturation was 35% to 100 %, the accuracy was 4% when low perfusion was smaller than or equal to 0.2%; and the pulse rate error is less than 1. In this study, the design had been improved in aspects of high precision, large scale, repetitiveness and anti-jitter. It is suitable for families, communities and other medical care occasions.

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