Method Implementation Of Hemodynamic Parameters From Monitoring Arterial Pressure And Pulse Signal Of Fingertip

The detection of hemodynamic parameters is an important indicator for evaluating cardiac function and an important basis for evaluating cardiovascular disease.The central output is one of the key parameters that reflect the pumping function of the heart.For diagnosis,disease evaluation or guidance development,the clinical output of cardiac output is mostly invasive or minimally invasive.Obtaining hemodynamic parameters from non-invasive blood pressure waveforms is a non-invasive detection method that has attracted much attention,but traditional blood pressure measurement methods cannot extract continuous dynamic blood pressure waveforms.In response to this problem,the research group proposes a noninvasive hemodynamic parameter monitoring method based on the principle of vascular unloading,which extracts hemodynamic parameters from finger-tip pressure pulse signals.However,the introduction of the principle of vascular unloading will affect the recording of photoelectric volume pulse waveform data.To solve this problem,the pressure pulse signal is introduced to counteract the interference received during the recording of the photoelectric volume pulse waveform.In order to further improve the measurement accuracy,this paper proposes a pressure follower method to achieve a quick search for the average arterial pressure,and corrects the continuous finger-tip pulse pressure by monitoring the static brachial artery blood pressure data,so as to accurately calculate the cardiac output parameters.Below is a summary of the major research work of this paper:(1)With the joint efforts of the members of the research group,the hardware and software joint debugging for the monitoring system was finished.Based on the prototype hardware device,a design plan to acquire finger-tip pulse pressure signals was designed.These signals require precision pressure control devices together with control algorithms and the principle of vascular unloading to be acquired.The design plan realizes quick response to the beating of finger-tip arteriole.(2)Extraction algorithm of cardiac output parameters.Firstly,the acquired pressure and pulse signals are processed,and then the pulse wave feature points are marked and identified.By designing the cardiac output parameter model,the human cardiac output parameters and other parameter indexes are calculated through signal correction.(3)Software design of cardiac output parameter monitoring system.The application program design of the hemodynamic parameter monitoring system is realized by using QT language.The main function is to realize the calculation and display of blood pressure waveform curve and hemodynamic related parameters.The software module includes pulse signal processing,parameter calculation and analysis,and UI interface for instrument interaction.(4)Construct a simulation experiment test device.Since the laboratory does not yet have the conditions for standard commercial hemodynamic parameter monitoring instruments to evaluate the experimental system,this paper builds an experimental device that simulates extracorporeal blood circulation,which is feasible and accurate for the designed hemodynamic monitoring system Sex verification.Experimental results suggest that the cardiac output monitoring and analysis method proposed in this paper can accurately reflect the changing trend of human cardiac output and meet the expected design goals and task requirements.