Research And Implementation Of Key Technologies Of Urodynamic System

With the increasing aging of our country,the number of people with lower urinary tract dysfunction increases accordingly.The demand for high-performance urodynamic analyzer will also increase gradually.Urodynamic analyzers purchased by domestic hospitals are mainly imported from abroad.The operation steps of the instrument are difficult to master.The maintenance cost will be higher.Pressure gauge conduit,connection conduit and other consumables are expensive.Therefore,it is of great significance to develop an urodynamic analyzer with high cost performance.Understanding and comparative analysis of representative urodynamic analyzers at home and abroad are made.Combined with the emergencies encountered in the actual inspection process,the real-time detection function of ECG signal was added.In the event of a heart attack,the patient can be informed and urgently treated by the medical staff.In this paper,the overall design scheme of the urodynamic system is proposed,and two key technologies are analyzed in the design.The whole urodynamic system is mainly composed of urinary flow rate measurement module,ECG signal detection module,bladder pressure measurement module,abdominal pressure measurement module and urethral pressure measurement module.Examination items include free urinary flow rate measurement,bladder pressure-volume measurement during filling period,and pressure-flow rate measurement during voiding period.Wavelet transform is used to deal with noise in ECG signal.Low frequency noise uses wavelet decomposition and reconstruction algorithm.High frequency noise uses non-linear wavelet threshold method.In the wavelet threshold denoising algorithm,the key is the selection of threshold.The improved threshold is selected to make up for the deficiency of the unified threshold.The first derivative of Gauss function is used as the wavelet function for R wave peak detection in ECG signal.The peak position is determined by modulus extremum method.In the simulation experiment of urine flow rate,when the liquid flows into the container,the mass waveform of the liquid will fluctuate due to the impact effect.The wavelet function is used to decompose the quality signal.Wavelet threshold method is used for smoothing,eliminating the impact of shock jitter.The prototype system is built with the selected hardware.The simulation experiments of urinary flow rate,bladder pressure and abdominal pressure were carried out.The data obtained from the corresponding modules are calculated and analyzed,and the measurement error is within the allowable range.The sensitivity of the module can also meet the design requirements.