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1. 发明授权

US06522111B2 Linear voltage regulator using adaptive biasing 失效
公开(公告)号：US06522111B2
公开(公告)日：2003-02-18
申请号：US09941408
申请日：2001-08-28
申请人： Ali Enayat Zadeh , Yung-I Chang
发明人： Ali Enayat Zadeh , Yung-I Chang
IPC分类号： G05F1573
CPC分类号： G05F1/575
摘要： A linear voltage regulator, such as a low-dropout regulator, supplies power to one or more digital circuits within a computer system. The low-dropout regulator provides a substantially constant output voltage independent of loading conditions. The low-dropout regulator is biased at a relatively low operating current for steady-state operation to improve power efficiency of the low-dropout regulator. During a loading condition change, an adaptive biasing circuit senses the loading condition change and provides additional biasing current to momentarily increase the operating current of the low-dropout regulator to improve transient response.

2. 发明授权

US5769873A Meter for measuring battery charge delivered in an implantable device 失效
标题翻译：用于测量在可植入设备中提供的电池电量的仪表
公开(公告)号：US5769873A
公开(公告)日：1998-06-23
申请号：US730262
申请日：1996-10-15
申请人： Ali Enayat Zadeh
发明人： Ali Enayat Zadeh
IPC分类号： A61N1/37 , A61N1/378
CPC分类号： A61N1/3708
摘要： An improved apparatus and method are described for providing a measurement of the charge depleted from a battery used in an implantable device such as a cardiac pacemaker. The measurement is provided not by measuring the voltage level or impedance of the battery, but rather by continuously measuring the electrical current drawn from the battery and integrating that measured current over an integration time period. A precision current-sensing resistor provides a sense signal having a voltage that varies according to the magnitude of current being drawn, and this sense signal is integrated using a voltage-controlled oscillator circuit and counter, which are implemented using CMOS circuitry arranged in a switched-capacitor topology.
摘要翻译：描述了一种改进的装置和方法，用于提供从诸如心脏起搏器的可植入装置中使用的电池中耗尽的电荷的测量。测量不是通过测量电池的电压电平或阻抗来提供的，而是通过连续地测量从电池中抽出的电流并在积分时间段内积分测得的电流。精密电流检测电阻器提供具有根据所绘制的电流的大小而变化的电压的感测信号，并且该感测信号使用压控振荡器电路和计数器来集成，其使用布置在开关中的CMOS电路电容拓扑。

3. 发明授权

US06658294B1 Implantable cardiac device having an impedance monitoring circuit and method 失效
标题翻译：具有阻抗监测电路和方法的可植入心脏装置
公开(公告)号：US06658294B1
公开(公告)日：2003-12-02
申请号：US09943145
申请日：2001-08-29
申请人： Ali Enayat Zadeh , Dro Darbidian , George I. Isaac
发明人： Ali Enayat Zadeh , Dro Darbidian , George I. Isaac
IPC分类号： A61N118
CPC分类号： A61N1/3925 , A61N1/3686 , A61N1/37 , A61N2001/083
摘要： A circuit within an implantable cardiac stimulation device monitors impedance of an electrode configuration including first and second electrodes in electrical contact with a heart. The circuit is within the implantable cardiac stimulation device which applies stimulation pulses having a current and a voltage magnitude across the electrode configuration. The circuit that monitors impedance of an electrode configuration provides an impedance digital output proportional to the ratio of a stimulation pulse voltage and current.
摘要翻译：可植入心脏刺激装置内的电路监测包括与心脏电接触的第一和第二电极的电极配置的阻抗。该电路在可植入的心脏刺激装置内，其施加在电极构型上具有电流和电压幅度的刺激脉冲。监测电极配置阻抗的电路提供与刺激脉冲电压和电流的比例成比例的阻抗数字输出。

4. 发明授权

US5810739A Methods and apparatus for classifying cardiac events with an implantable cardiac device 失效
标题翻译：用可植入心脏装置分类心脏事件的方法和装置
公开(公告)号：US5810739A
公开(公告)日：1998-09-22
申请号：US770767
申请日：1996-12-19
申请人： Gene A. Bornzin , Alan B. Vogel , Ali Enayat Zadeh , Jonathan A. Kleks , Raymond J. Wilson
发明人： Gene A. Bornzin , Alan B. Vogel , Ali Enayat Zadeh , Jonathan A. Kleks , Raymond J. Wilson
IPC分类号： A61N1/37 , A61N5/0452
CPC分类号： A61N1/3702
摘要： Methods and apparatus are provided for classifying cardiac events with an implantable cardiac device. Cardiac signals are stored in a buffer. When a significant cardiac event is confirmed, a corresponding segment of the stored cardiac signals is processed to generate a set of feature values. The set of feature values is compared to various sets of reference values. Each set of reference values preferably corresponds to a separate type of cardiac event, so that the cardiac device may classify the significant cardiac event by matching its set of feature values to a set of reference values. Feature values include the maximum positive and negative slew rates exhibited by the cardiac signal during the segment, the maximum positive and negative signal amplitudes, the times to reach the maximum positive and negative signal amplitudes, the area under the cardiac signal curve, the area under the cardiac signal curve above zero as compared to the area below zero, and the number of zero crossings made by the cardiac signal. Additional feature values are generated by simultaneously processing the cardiac signals measured along two different vector directions in the heart.
摘要翻译：提供了用可植入式心脏装置对心脏事件进行分类的方法和装置。心脏信号存储在缓冲区中。当确定重要的心脏事件时，处理存储的心脏信号的对应段以产生一组特征值。将特征值集合与各种参考值集进行比较。每组参考值优选对应于单独类型的心脏事件，使得心脏设备可以通过将其特征值集合与一组参考值相匹配来对重要心脏事件进行分类。特征值包括段内心脏信号显示的最大正负压摆率，最大正负信号幅度，达到最大正和负信号幅度的时间，心脏信号曲线下的面积，与零度以下的区域相比，零点以上的心脏信号曲线以及由心脏信号产生的过零点数。通过同时处理在心脏中沿着两个不同矢量方向测量的心脏信号来产生附加特征值。

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