Surgery – Truss – Pad
Patent
1991-02-08
1992-04-07
Kamm, William E.
Surgery
Truss
Pad
128901, 324 99D, A61B 50428
Patent
active
051018322
ABSTRACT:
A cardiograph has a remote front end which is connected to a host via a cable. The front end includes a clock and an analog-to-digital converter. The converter periodically holds and samples patient ECG signals. Each conversion takes place within the same fixed length of time. A clock signal is transmitted to the host on one of the conductors in the cable while digital words, each of which represents a sampled value of the ECG signal, are serially transmitted on another conductor in the cable. The clock signal synchronizes ac voltages applied to several power supplies with the sampling rate of the converter so that the ECG signal is sampled at the same phase of each ac voltage applied to the power supplies. The sampling thus occurs at the same phase, and thus the same amplitude, of each periodic noise cycle induced by the power supply electromagnetic fields. The periodic noise is thus removed from the sampled signal while a dc offset equal to the amplitude of the periodic noise at the sampling phase is added.
REFERENCES:
patent: 3354453 (1967-11-01), Hibbits et al.
patent: 3480949 (1969-11-01), Charbonnier
patent: 4243045 (1981-01-01), Maas
patent: 5010887 (1991-04-01), Thornander
Belesiu Jim T.
Powers Daniel J.
Pritchard Bruce A.
Hewlett--Packard Company
Jastrzab Jeffrey R.
Kamm William E.
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