Research And Design Of Cuff Vital Signs Parameter Monitoring System

In the medical armored vehicle rescue,large medical monitoring instrument is difficult to meet the requirements of vehicle environment.Portable medical equipment has become the mainstream of research.The basic physical parameters include blood pressure,saturation of peripheral oxygen and pulse rate.Accurate real-time physical sign data is of great clinical significance in the rescue process.A suitable automatic monitoring equipment can improve the rescue efficiency and reduce the workload of medical staff.It designs a cuff-type physical parameter monitoring system based on the above background research.The arterial blood pressure signal and fingertip volume pulse wave collection of the human body is completed through the cuff and the medical fingertip cuff.Combine the corresponding algorithm to complete the detection of blood pressure,saturation of peripheral oxygen and pulse rate.The system can display the current detection parameters once.The relevant result data of the detection is transmitted to the computer terminal for storage through the wireless transmission module.For medical staff to refer to and formulate relevant medical care plans in time.It includes hardware design and software algorithm processing.In terms of hardware,the software filtering method is used to replace the discrete component signal processing circuit.In this way,the hardware components are reduced and the overall device volume is reduced.The device uses a low-power,highly integrated blood oxygen signal acquisition module to replace discrete component circuits to improve battery life.In the design of software algorithm preprocessing,the original oscillatory pulse wave signal is filtered by high frequency software.The baseline drift in oscillatory and volumetric pulse waves is mainly corrected by morphological filtering.In the algorithm design,it uses the differential threshold method to locate the peak characteristic sequence.In the algorithm processing,the fundamental wave-based method is used to realize the amplitude contour processing of the oscillating pulse signal.It performs interpolation operations on the positioning peak sequence,effectively reducing the problem of poor amplitude coefficient matching caused by uneven matching of discrete peaks.The systolic and diastolic blood pressure are determined by combining the variable amplitude coefficient judgment criterion in the oscillometric method and the blood pressure signal sequence.It uses volume pulse wave and blood oxygen calibration fitting formula to complete the calculation of pulse rate and blood oxygen.The prototype developed by the experiment has been tested for related function and parameter accuracy.The endurance of the system shall not be less than five hours.It has reached the expected target.The maximum error of a single measurement of systolic blood pressure is 8mm Hg.Its mean error is up to 4.8mm Hg,and the maximum standard deviation is 2.5mm Hg.The maximum error for diastolic blood pressure was 9 mm Hg in a single test.Its mean error is up to 4.3 mm Hg.Its maximum standard deviation error is 2.5 mm Hg.The maximum mean error of saturation of peripheral oxygen is 2.4%,which is less than 3%.The average pulse rate error is 4.3 bpm.It analyzes the consistency between the measurement results and the standard data.It satisfies the confidence interval criterion.Its index accuracy test meets relevant medical standards.