Surgery – Truss – Pad
Patent
1991-01-23
1992-12-15
Smith, Ruth S.
Surgery
Truss
Pad
128696, 128723, 128734, A61B 508
Patent
active
051707942
ABSTRACT:
A method for deriving a respiration signal and/or a cardiac artifact signal from a physiological signal, in particular an impedance pneumography signal, includes detection of a heartbeat moment, storing the amplitude of the physiological signal at the heartbeat moment, and calculating and storing a learning signal, the learning signal being a function of a previous learning signal and the difference between the instantaneous amplitude of the physiological signal and the stored amplitude thereof. The learning signal is either read out starting each time with the particular heartbeat moment, for deriving the cardiac artifact signal, or subtracted from the physiological signal at each heartbeat moment for deriving the respiration signal.
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patent: 3976052 (1976-08-01), Junginger et al.
patent: 4379460 (1983-04-01), Judell
patent: 4422458 (1983-12-01), Kravath
patent: 4582068 (1986-04-01), Phillipps et al.
patent: 4781201 (1988-11-01), Wright et al.
"Methods of filtering the heart-beat artifact from the breathing waveform of infants obtained by impedance pneumography," Wilson et al, Medical & Biological Engineering & Computing, May 1982.
Hewlett--Packard Company
Nasser Jr. Robert L.
Smith Ruth S.
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