The Design And Implementation Of Breathsounds Monitoring System In Surgery

During the operation, if the patient’s respiratory system has lesionsorrespiratory organ has lesions, they will affectthe respiratory center when theyhave gradual deteriorate.When the mutation occurs in internal organ of human, italso involves the respiratory system. Respiratory failures will cause othervisceral failures. They are reciprocal causation, so we must attach greatimportance to the respiratory monitoring and managementin patients’operation.An internationally recognized intraoperative patient respiratoryfunction standardization monitoring is very important to prevent respiratoryadverse reactions or accidents and ensure patient safety.Breath sound is a kind of important means in patients’respiratory functiondetection. The patients’ tidal volume, lung function, lung volume, respiratorymechanics, gas exchange function and blood gas analysis can be reflected bybreath sounds, so it has irreplaceable advantages.However, the traditionalmonitor for respiratory sound mainly uses stethoscope to auscultate lungs, thedoctor to make subjective judgments, there exist many deficiencies.Use avisualized waveform to display, extract the characteristic parameters afterprocessing, establish characteristic parameter library to characterize respiratoryfunction in order to realize respiratory sound monitor, it will have a greatpractical value in the respiratory condition monitoringin operation.Based on the analysis of the current domestic and international respiratoryfunction monitoring system, by using digital signal processing technology, thispaperhas designed a system of patient breathing sound signal real-timemonitoring display, storage and operation analysis in operation based on DSP.The hardware design of the system first used the respiration sensor HKY-06F to collect patient’s breath sound signalduring operation, TMS320VC5509Aas the main control chip, AIC23control chip for signal analog-to-digital and digital-to-analog conversions.The data after processed by DSP will be deliveredinto the KM12864LCD display module for display. SD card with4G storagemodule is designed for data storage, mobile storage function.Finally, the chipTL16C550is used to extend the serial communication module, and a GUIapplication program can easily extracted for display or analysis of breath sounds.The software part is finished by C language program in CCS3.3development environment, it makes the main control chip and modules work innormal operation, it also finishes the completion of FIR filter processing, tidalvolume, frequency, the average energy and other parts of respiratory soundfeature extraction.Finally, debugging and analysis of results has been conducted to this breathsound monitoring system. This monitoring system has completed the followingfunctions: real-time monitoring of the patient s’ breath sound signal based oninitial graphic liquid crystal display, storage of data of SD card andserialcommunication function. The system has achieved the purposes ofrespiratoryfunction monitoring during operation and can be used in the auxiliary operationto ensure the life safety of patients.