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    • 5. 发明授权
    • Method for automatically adjusting the sensitivity of cardiac sense
amplifiers
    • 自动调节心律放大器灵敏度的方法
    • US6112119A
    • 2000-08-29
    • US957908
    • 1997-10-27
    • Robert J. SchuelkeJames W. BusackerJames D. ReinkeKevin L. BrightRussell E. AndersonVirginia De La RivaDavid W. HoffmanRen Zhou
    • Robert J. SchuelkeJames W. BusackerJames D. ReinkeKevin L. BrightRussell E. AndersonVirginia De La RivaDavid W. HoffmanRen Zhou
    • A61N1/37A61N1/362
    • A61N1/3704
    • Two mechanisms work together to adjust two variables independently so that the gain of an input amplifier used to find physiologic signals in an implantable medical device can be automatically adjusted to enhance the signal to noise ratio of the electrical input to said amplifier. The first determines whether there has been too long a time between senses found in the body's electrical input to the amplifier and if true, and no other conditions override that consideration, it adjusts the value of a long term average parameter which is used as a referent parameter to adjust the actual parameter that is used as the referent for making either a threshold level adjustment or gain change, depending on the structure of the particular design's circuitry and/or software. One set of adjustments to the gain referent parameter depends on the relative size of the long term average parameter and the gain referent parameter. The mechanisms preferably employ counting registers, the one which adjusts the gain referent having a process to weight input signals such that those of different types get different weights, and the other mechanism only accepting certain of the input signals. Input signals to the two mechanisms can be either physiologically based or from stimulation pulses issued from an implanted device, such as, for example a pacemaker.
    • 两个机构一起工作以独立地调整两个变量,使得可以自动调整用于在可植入医疗装置中发现生理信号的输入放大器的增益,以增强到所述放大器的电输入的信噪比。 第一个确定在身体对放大器的电输入中发现的感觉之间是否存在太长的时间,如果是真的,并且没有其他条件覆盖该考虑,则它调整用作指示物的长期平均参数的值 参数,以根据特定设计的电路和/或软件的结构来调整用作参考对象的实际参数以进行阈值电平调整或增益改变。 增益参数参数的一组调整取决于长期平均参数和增益指标参数的相对大小。 这些机制优选地采用计数寄存器,调整增益指示器的调试寄存器具有加权输入信号的过程,使得不同类型的信号获得不同的权重,而另一机制仅接受某些输入信号。 对两种机制的输入信号可以是生理学的,也可以是从植入装置(例如起搏器)发出的刺激脉冲。