Texas Instruments automatic external defibrillator (AED) solutions

Most automatic external defibrillator (AED) is a highly complex Microcontroller devices, they can monitor life-threatening heart rhythm, evaluate and treat patients automatically.

It captures for ECG electrodes, run ECG analysis algorithms to identify available electric cardioversion and suggestions operators need defibrillation. Automatic external defibrillator designed programme of key? this article will give you the answer. Most automatic external defibrillator (AED) is a highly complex Microcontroller devices, they can monitor life-threatening heart rhythm, evaluate and treat patients automatically. It captures for ECG electrodes, run ECG analysis algorithms to identify available electric cardioversion and suggestions operators need defibrillation. Basic defibrillator contains high voltage power supplies, storage capacitors, optional inductors and patient electrode. It can produce the storage capacitor to form a potential current charge. The higher the voltage, the electric current may be formed. AED output audio and Visual cues. In a typical sequence, defibrillator AED provides voice prompts to guide users to connect patients with electrodes, and then start getting ECG data. If the ECG in patients with AED analysis and detection to electric cardioversion, capacitor will charge, Wc = 1/2CV ^ 2c; while the capacitor voltage Vc (t) = Vc (0) e-t/RC, R = R (lead) << R (chest). Press the button provides a high-voltage pulse electric shock, current flows through the body will begin to go most of cardiomyocytes, polarizability and reconstruction coordination contraction and normal heart rate. Current by capacitors and physical resistance. Many jurisdictions also require AED on cardiac arrest scene recording for later analysis. All AED shall include a storage and retrieval of patient ECG pattern method. AED front-end signal from placed in the patient's ECG electrodes, which require amp amplifier to its very small amplitude < 10mV). Targeted instrumentation amplifiers would be designed to have:

Induction 0.1mV-10mV minor amplitude signals

Extremely high input impedance (> 5MO)

Very low input leakage current (< 1uA)

Flat frequency response 0.1Hz-100Hz

High common mode rejection ratio (CMRR) (> 100dB) AED of another input is used to record the audio from the microphone of the scene.

ECG and microphone inputs have been digitized and DSP processing. Most of the AED design using 16-bit processor, therefore, can be used with a 16-bit ADC to digital ECG and voice input. Amplification of the ECG signal bandwidth for 0.1Hz-100Hz, you need a minimum of SNR 50dB. Recording/playback signal General bandwidth needs for 8kHz, SNR of minimum 65dB. Microphone input also needs to be enlarged up to programmable gain 40dB. AED has synthetic audio instructions, volume control output is connected to the headset speakers or 8 Ω speakers. TLV320AIC20 simplifies digital process, because the front integrates 2 ADC, DAC, 2, 1 x microphone amplifier, 1 x headphone drive and 1 with a volume control 8 Ω drive; and it can be to seamlessly connect DSP. TI automatic external defibrillator (AED) solution block diagram.