Design And Implementation Of Ventilator Data Acquisition And Analysis System

The ventilator is the most important life support device in the intensive care unit(ICU).Its parameters and waveforms reflect many physiological signs of patients.However,there are two problems in the current use of ventilators.Firstly,most of the ventilators work in a standalone mode,with a low degree of informatization.The medical staff needs to manually record and input the parameters of the ventilators,leading to a huge workload and the procedure is prone to errors.Secondly,the improper settings of the ventilators are frequently observed.The hydrops is not processed in time.These problems will affect the treatment effect on the patient.In consideration of the above problems,this thesis designs a data acquisition and analysis system for ventilator data.First,the system sends instructions according to the ventilator communication protocol to request ventilator data,and transmits the collected ventilator data to the remote host computer server for real-time display.Then,a real-time analysis technique of respiratory waveform is designed,which can automatically determine the occurrence of hydrops in the ventilator tubes and prompt the medical staff to process.The nurses can observe the working condition of all the ventilators in the central station at the same time,and treat the patients with abnormal breathing timely.All ventilator data are electronically realized,which can greatly improve the work efficiency of medical staff,and has a good application prospect in departments such as ICU.The main work and achievements of this thesis are as follows:1.The wireless transmission hardware modules of the system were designed,implemented,and tested.The overall framework design of the system,the circuit diagram design and the optimization of each sub-module were considered.2.By studying the official manual of mainstream ventilators,the communication protocol and data transmission process of current mainstream ventilator were analyzed,and the features of command instruction and response instruction of MEDIBUS communication protocol as well as the encapsulation format of ventilator data were summarized to clarify the communication process of ventilator.A computer program was designed to implement the ventilator communication and the analysis and display of respiratory parameters and waveforms.3.A wavelet transform-based algorithm for determination of hydrops in ventilator tubes was proposed.Firstly,the pressure waveform of the ventilator was decomposed by wavelet.The low-frequency component after decomposition is the characteristic information of the hydrops in the ventilator.A threshold screening method was used to determine the characteristic section of the hydrops in the ventilator.The data collection and analysis system of ventilator designed in this paper implemented the wireless collection and transmission of ventilator data by using Wi-Fi wireless transmission technology,which greatly improves the digitization degree of ventilator use and reduces the workload of medical staff in recording patient data.Based on the wavelet multi-scale decomposition method,the automatic detection algorithm of hydrops in the ventilator pipe was proposed,and the accuracy rate was 97.2% on a clinical dataset.