Fuzzy Control of portable ECG monitor design (1).

<P> Present, the ECG signal acquisition, analysis and diagnosis-based ECG monitoring system has been widely used system for heart disease prevention, diagnosis plays a significant role. .But such ECG can only be static in the patient or the patient to be used under special circumstances, the request is too high for heart disease, especially heart disease and early heart disease patients with suspected patients, affecting their normal work .life; while the other, a portable ECG monitor, its 24 hours to care, but it requires a lot of storage space, for the playback of the ECG also requires a lot of time, in view of the above two issues, the paper design based on fuzzy control .Portable ECG monitor. .He overcome these two problems at the same time also broke the previous single-line value in diagnosing a disease treatment, to more accurately determine the ECG is abnormal to achieve the alarm time. .</ P> <P> 1 System President Design </ P> <P> 1.1 design objectives </ P> <P> according to ECG characteristics, and biological signal processing system and modern technology requirements of ECG, the system .SOC C8051F020 MCU used as a high-speed ECG monitor chip to achieve the following main features: </ P> <P> (1) measuring a non-invasive, safe, accurate, repeatable, etc.; </ P> <P> ( .2) easy to operate, simple measurements and does not affect patient care to be a normal life; </ P> <P> (3) real-time analysis of ECG and determine the signal is abnormal, the initial diagnosis of abnormal ECG monitoring of patients .disease; </ P> <P> (4) 16 MB of FLASH memory to store the user's unusual 24-hour signal; </ P> <P> (5) the system error alarm function; </ P> <P> .(6) can be stored through the USB interface, abnormal ECG signal transferred to the PC, for further ECG signal diagnosis. .</ P> <P> 1.2 System hardware components </ P> <P> hardware diagram of the system shown in Figure 1. .</ P> <P> first collection from the electrode circuit under test the weak ECG signal, and then this signal amplification, filtering directly into the master after a chip into the lead off another detection circuit, .C8051F020 then connected with the main chip. .After the signal into the main chip C8051F020, its corresponding treatment, to achieve the alarm, storage, judge, send and other functions. .</ P> <P align=center> </ P> <P> 1.3 overall system flow chart </ P> <P> overall system flow chart shown in Figure 2. .</ P> <P align=center> </ P> <P> 2 fuzzy control section </ P> <P> ECG automatic analysis of the main objectives for arrhythmia diagnosis. .Clinical diagnosis of arrhythmia is a combination of automatic rhythm analysis and waveform morphology analysis, the measured ECG waveform recognition classification, and diagnosis based on pre-determined standards or criteria to make appropriate clinical diagnosis. .Which the design is based on the extracted characteristic value combination of medical knowledge and medical expert system to complete the judge. .</ P> <P> first test based on the following criteria to treat patients with an initial diagnosis: </ P> <P> tachycardia RR interval <0.5 s (120 times / min); </ P> <P .> bradycardia RR interval> 1.5 s (40 times / min); </ P> <P> arrest and ventricular fibrillation without QRS wave in a long time, generally this time> 1.6 s; </ P .> <P> drain pump an RR interval before the average is about 2 times the RR interval and does not appear after a premature beat is detected as a drain pump, if the RR interval is 2 times larger than average but less than 1.5 s, .room to stop as the sinus is detected; </ P> <P> ventricular premature beat ventricular premature beats in pairs (two consecutive ventricular premature beats): ventricular bigeminy (PVCs alternating normal and more than twice); .Office of the Joint Law (normal, normal and room more than twice as early as alternate), are the property of the premature ventricular contractions. .Testing standards complex and require further analysis using fuzzy logic to determine; </ P> <P> R T fell on (R on T) This is the period of ventricular repolarization (T wave) appears in the PVC, the T wave can not be detected .Therefore, only by rhythm analysis; </ P> <P> into premature beat does not stop the premature compensation, roughly equal to the premature of the RR interval of the average RR intervals before the premature; </ P> <P>.