Research On Non-invasive Monitoring Device Of Cerebral Blood Oxygen

Cerebral blood oxygen is an important parameter that can reflect the oxygenation status of human brain tissue,and can evaluate the activity of brain function.The monitoring of cerebral blood oxygen value is very important for monitoring cerebral hemorrhage and cerebral hypoxia in patients during perioperative period.Significance has gradually become an important indicator of the clinical perioperative period.At present,invasive or indirect measurement methods are often used clinically to monitor the changes of cerebral blood oxygen in patients.False positive or false negative results may occur in the measurement results,and may even cause physical pain to the patient.However,most of the non-invasive monitoring devices for cerebral blood oxygen used in clinical practice have shortcomings such as large individual differences and poor repeatability.In response to the above problems,this article follows the idea of product design,on the basis of sufficient market research,demand analysis and theoretical research,combined with the research background of cerebral blood oxygen equipment,research status at home and abroad and clinical needs,based on near infrared spectroscopy technology(Near-Infrared Spectroscopy,NIRS),from theoretical research,device design,functional testing and other links to research the cerebral blood oxygen non-invasive monitoring device,preliminary completed the cerebral blood oxygen non-invasive monitoring device prototype,and verified its monitoring signal and cerebral blood through experiments Correlation of oxygen changes.The main content of this article is as follows:Based on a more in-depth understanding of the principle of cerebral blood oxygen non-invasive monitoring,combined with the anatomical structure of the human brain,a four-wavelength cerebral blood oxygen non-invasive monitoring sensor probe was designed.A comparative study of model selection,selection of integrated LED chips and photodetectors with specific wavelength ranges,and finally an in-depth study on the arrangement of LED chips and photodetectors and the position of the probe attached to the body surface.(2)According to the results of market research and demand analysis,the system hardware circuit is designed with MSP430F5529 microcontroller as the central measurement and control host module,which realizes the functions of light source driving,signal conditioning,four-channel cerebral blood oxygen data acquisition,data transmission,etc.Electromagnetic compatibility design;based on the IAR Embedded Workbench embedded development platform,it realizes the MSP430F5529microcontroller-based light source drive control,data acquisition,data processing,data transmission and other embedded functions;and based on MATLAB to collect the near-infrared spectrum signal Analyze and process to evaluate the relevance of cerebral blood oxygen information contained in the signal and the feasibility of the acquisition scheme.(3)According to the performance requirements and functional requirements of the product,the prototype was tested for system voltage stability,AD conversion performance,data transmission performance,electrical safety,and radiation immunity.The prototype was also tested for cerebral blood oxygen data collection and data The function test of the transmission initially verified the function of the prototype.