PRINCIPLES OF CONSTRUCTION OF A THREE-WAVE TWO-CHANNEL LASER PULSE OXIMETER

Abstract

Background. Currently, there are a number of unsolved fundamental scientific problems related to obtaining reliable information when monitoring the treatment of various diseases. The problem of diagnostic medical equipment using optical research methods is particularly relevant. This implies the purpose of the study: to determine the system connections and patterns of interaction between technical systems with complex biological systems (bloodstream) in the process of assessing their condition, and on this basis substantiate the principle of constructing a high-resolution laser pulse oximeter with high accuracy characteristics. Materials and methods. Optical research methods related to the depth of penetration of the optical trace and its adequate perception by the comparison system to obtain reliable signals. Results. The principle of constructing a three-wave two-channel laser pulse oximeter using the third wavelength (λ = 805 ± 0.75 nm) is proposed. The radiation wavelength of 804.25... 805.75 nm is an "isobestic point", at this wavelength the spectral characteristics of hemoglobin and oxyhemoglobin coincide. Conclusions. A three-wave two-channel laser pulse oximeter with improved accuracy characteristics has been proposed, the measurement error of which has been reduced to 5 %, %, compared with other analogues, where the error is up to 30 %.

Keywords

• three-wave laser pulse oximeter
• photoplethysmogram
• isobestic point
• saturation
• hemoglobin
• oxyhemoglobin
• laser sensor
• accelerometer