公开(公告)号：US20100204758A1

公开(公告)日：2010-08-12

申请号：US12703427

申请日：2010-02-10

申请人： Scot C. Boon ,  Keith R. Maile ,  William J. Linder ,  Paul Huelskamp ,  Ramprasad Vijayagopal

发明人： Scot C. Boon ,  Keith R. Maile ,  William J. Linder ,  Paul Huelskamp ,  Ramprasad Vijayagopal

IPC分类号： A61N1/08

CPC分类号： A61N1/37217 ,  A61N1/3727 ,  H04B11/00 ,  H04B13/005

摘要： An intra-body ultrasonic signal can be converted into a first electrical signal, a local oscillator signal can be generated in an implantable system. The first electrical signal and the local oscillator signal can be mixed in an implantable system, such as to generate a demodulated signal, processed, such as using a filter. The filtered, demodulated signal can be further processed, such as implantably determining a peak amplitude of the first portion of the demodulated signal received from the filter over a time interval, implantably generating a dynamic tracking threshold that starts at an amplitude proportional the first portion of the demodulated signal and exponentially decays over a time interval, and determining a noise floor in the absence of a received intra-body ultrasonic signal and implantably comparing the peak amplitude and the tracking threshold and generate the digital output based on the difference.

摘要翻译： 体内超声波信号可以转换成第一电信号，在可植入系统中可以产生本地振荡器信号。 第一电信号和本地振荡器信号可以在可植入系统中混合，例如产生经处理的解调信号，例如使用滤波器。 滤波后的解调信号可被进一步处理，诸如可植入地确定在时间间隔上从滤波器接收的解调信号的第一部分的峰值幅度，可植入地产生动态跟踪阈值，该动态跟踪阈值以与第 所述解调信号在时间间隔上指数衰减，以及在没有接收到的体内超声波信号的情况下确定噪声基底，并且可植入地比较所述峰值幅度和跟踪阈值，并且基于所述差异生成所述数字输出。