| 摘要 |
Apparatus for diagnostic analysis of patient-installed pacemaker devices. Patient connection is made via standard ECG leads and an electrically floating front end subassembly having means providing precise gain to the paced ECG input signal and conversion thereof to a digital form via very high rate, monobit delta-sigma modulation digitization. The front end also contains special overload indication circuitry, a reciprocal attenuation network to ensure high fidelity of the information being processed by the system and crystal clock controlled calibration means for providing a validity check of virtually the entire system. A pacer pulse sensing network provides as separate outputs in analog form the on-line, real-time, paced ECG and the individual pulses generated by the pacemaker device. A memory/magnification subassembly is also included, operating on the digitized paced ECG information, calibration and clock outputs from the front end, as well as the identified pacer pulses from the pacer pulse sensing network, to selectively provide as outputs, magnified X1000 in time, the calibration waveform and the pacemaker-generated pacer pulses in either digital or analog form. These and the on-line, real-time paced ECG signal are available for recordation locally and for transmission over the telephone.
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