发明名称 |
High resoution bio-impedance device |
摘要 |
A method and apparatus for the non-invasive measurement of cardiac function. A signal is applied between a pair of electrodes on a patient. The signal delivers a constant alternating current at multiple simultaneous frequencies. A second pair of electrodes measures a voltage signal. The impedance at each frequency is obtained by demodulating the current signal and the voltage signal using techniques such as Fast Fourier Transform (FFT). The FFT gives a phase and amplitude which is converted to an impedance value. The impedance values are fitted to a theoretical frequency dependent impedance locus and the locus is extrapolated to obtain a value at zero frequency. The steps are repeated to obtain a time-varying plot of impedance and measures of cardiac function are calculated from the time-varying plot.
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申请公布号 |
US2006247543(A1) |
申请公布日期 |
2006.11.02 |
申请号 |
US20030530860 |
申请日期 |
2003.10.09 |
申请人 |
CORNISH BRUCE;THOMAS BRIAN;CHETHAM SCOTT |
发明人 |
CORNISH BRUCE;THOMAS BRIAN;CHETHAM SCOTT |
分类号 |
A61B5/02;A61B5/029;A61B5/053 |
主分类号 |
A61B5/02 |
代理机构 |
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地址 |
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