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81. 发明授权

US5384544A Method and apparatus for calibrating the energy output of a defibrillator 失效
标题翻译：用于校准除颤器的能量输出的方法和装置
公开(公告)号：US5384544A
公开(公告)日：1995-01-24
申请号：US25295
申请日：1993-03-02
申请人： Ben Flugstad , Judith Cyrus , Daniel J. Powers
发明人： Ben Flugstad , Judith Cyrus , Daniel J. Powers
IPC分类号： A61N1/39 , G01R27/26 , G01R35/00
CPC分类号： A61N1/3937 , G01R27/2605
摘要： A defibfillator has a self healing storage capacitor connected in parallel with a safety resistor, and a microcontroller. Upon receipt of a calibration request, the microcontroller charges the capacitor to a charging voltage greater than a starting voltage, then discharges the capacitor through the safety resistor. As the capacitor is discharging, the microcontroller continuously measures the voltage across the capacitor. When the microcontroller detects that the voltage across the capacitor is less than or equal to a starting voltage, a timer in the microcontroller is started. When the microcontroller detects that the voltage across the capacitor is less than or equal to an ending voltage, the timer in the microcontroller is stopped. The microcontroller then determines an elapsed time between the time the timer was started and stopped. The microcontroller then calculates a capacitance value of the capacitor based on the starting voltage, the ending voltage, and the elapsed time. This capacitance value is stored in memory, and used to calibrate the energy output of the defibrillator by assuring that the self healing storage capacitor has been charged to a voltage level sufficient to deliver the desired amount of energy to a patient.
摘要翻译：除颤器具有与安全电阻并联的自愈保存电容器和微控制器。在接收到校准请求时，微控制器将电容器充电到大于启动电压的充电电压，然后通过安全电阻将电容器放电。当电容器放电时，微控制器连续测量电容器两端的电压。当微控制器检测到电容器两端的电压小于或等于启动电压时，微控制器中的定时器开始。当微控制器检测到电容器两端的电压小于或等于终止电压时，微控制器中的定时器停止。然后，微控制器确定定时器启动和停止的时间之间的经过时间。然后，微控制器基于起始电压，结束电压和经过时间来计算电容器的电容值。该电容值存储在存储器中，用于通过确保自愈保存电容器被充电到足以将期望量的能量输送给患者的电压电平来校准除颤器的能量输出。

82. 发明授权

US5101832A Method and apparatus for making electrical measurements in the presence of periodic electromagnetic fields 失效
标题翻译：在存在周期性电磁场的情况下进行电气测量的方法和装置
公开(公告)号：US5101832A
公开(公告)日：1992-04-07
申请号：US652958
申请日：1991-02-08
申请人： Bruce A. Pritchard , Daniel J. Powers , Jim T. Belesiu
发明人： Bruce A. Pritchard , Daniel J. Powers , Jim T. Belesiu
IPC分类号： A61B5/0428
CPC分类号： A61B5/04282 , Y10S128/901
摘要： A cardiograph has a remote front end which is connected to a host via a cable. The front end includes a clock and an analog-to-digital converter. The converter periodically holds and samples patient ECG signals. Each conversion takes place within the same fixed length of time. A clock signal is transmitted to the host on one of the conductors in the cable while digital words, each of which represents a sampled value of the ECG signal, are serially transmitted on another conductor in the cable. The clock signal synchronizes ac voltages applied to several power supplies with the sampling rate of the converter so that the ECG signal is sampled at the same phase of each ac voltage applied to the power supplies. The sampling thus occurs at the same phase, and thus the same amplitude, of each periodic noise cycle induced by the power supply electromagnetic fields. The periodic noise is thus removed from the sampled signal while a dc offset equal to the amplitude of the periodic noise at the sampling phase is added.
摘要翻译：心电图仪具有通过电缆连接到主机的远程前端。前端包括一个时钟和一个模拟 - 数字转换器。转换器周期性地保存并采样患者ECG信号。每次转换都会在相同的固定时间内进行。时钟信号在电缆中的一根导体上发送到主机，而数字字（每个代表ECG信号的采样值）在电缆中的另一导体上串行传输。时钟信号使施加到几个电源的交流电压与转换器的采样率同步，使得ECG信号在施加到电源的每个交流电压的相同相位被采样。因此，采样因此发生在由电源电磁场引起的每个周期性噪声周期的相同相位，因此发生相同的幅度。因此，从采样信号中去除周期性噪声，同时增加等于采样相位周期噪声振幅的直流偏移。

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