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Abstract
Defibrillation overload recovery performance is one of the most important electrical properties of ECG electrodes, which directly affects the ECG display after the patient is defibrillated, thereby affects the diagnosis and treatment of the patient. A defibrillation overload recovery performance test system for ECG electrodes was developed according to the latest pharmaceutical industry standards and based on the C8051F340 hardware system. With USB protocol data transfer, the detection of defibrillation overload recovery performance parameters (including AC impedance) is implemented on LabVIEW software platform. The system has good electrical isolation control, which can accurately operate the charging and discharging time during test process automatically. Experiment result shows that this system has good performance, and features safe, accurate and easy to operate.
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A new defibrillator with adjustable shock duration and measurable shock energy has been designed. This defibrillator is based on biphasic truncated decaying exponential waveform and can release 1~3 groups of biphasic truncated decaying exponential waveform according to manual setup. The pulse duration and the interval between the pulses of the shock can also be set freely by the operator, and the minimum step is 0.1 ms. The voltages on the energy storage capacitor before and after the shock can be measured, and the accurate practical defibrillation energy also can be calculated from the voltages and the capacitance of the storage capacitor. This defibrillator optimizes the shock waveform to realize low energy defibrillation through adjusting the pulse duration, interval and number of the pulses on the basis of biphasic truncated decaying exponential waveform. The capabilities of the defibrillator are validated through more than 20 animal trial applications.
This paper describes the detailed hardware design of Power regulator in Fluid-power measuring experimental platform which is one kind of power control system. The function of this part mainly is adjusting heating power that based on temperature requirements, and then calculates the new power measurement. The hardware device mainly is composed of two parts, AC power regulator circuit and AC voltage measurement circuit. The former measured output voltage of heater, while the latter measured output current. The heating power can be obtained after sampling them and corresponding treatments for them. Through the analysis of measurement data, the results show that it's reasonable for power measurement with this program and more accurate data can be obtained. Overall, the results fit better with the facts.
The series equivalent resistance R and capacitance C of metal/saline electrode/electrolyte interfaces were measured as a function of frequency (100 Hz-20k Hz) and current density (0.25 to 1000 A m-2) for eight typical electrode metals. For each of the metals tested, R decreased and C increased as the current density was increased above a critical value (with the exception of silver and MP35N at frequencies above 1 kHz for which R increased and C decreased slightly). With the exception of copper, the current density linearity limit (for 10 per cent decrease in R or 10 per cent increase in C) increased with increasing frequency and, in most cases, the current density linearity limit for 10 per cent increase in C was slightly less than that for 10 per cent decrease in R. Among the metals tested, copper and aluminium had the lowest current carrying capability and rhodium had the highest current-carrying capability. The current carrying capabilities of 316 SS, platinum, silver and MP35N, were intermediate and similar. With increasing current density, an increase in the electrode/electrolyte capacitance was the most sensitive indicator of the current-carrying linearity limit.