Method and apparatus for removing cardiac artifact in impedance

Details Method and apparatus for removing cardiac artifact in impedance Method and apparatus for removing cardiac artifact in impedance

1980-09-18

1983-04-12

Cohen, Lee S.

Surgery

Truss

Pad

128723, A61B 508

Patent

active

043794602

ABSTRACT:
A method of removing cardiac artifact during monitoring of a patient's respiration using impedance plethysmography when the patient has a regular, substantially periodic heartbeat. This method comprises generating an impedance signal responsive to both cardiac and respiration activity in the patient's chest. The signal is filtered by removing the cardiac activity component due to its substantially periodic character. An output signal is produced from the filter apparatus which is a function of substantially only the patient's respiration rate.
An improved impedance plethysmograph carries out the method substantially as described above.

REFERENCES:
patent: 3347223 (1967-10-01), Pacela
patent: 3536062 (1970-10-01), Ham
patent: 3572317 (1971-03-01), Wade
patent: 3587562 (1971-06-01), Williams
patent: 3608542 (1971-09-01), Pacela et al.
patent: 3742936 (1973-07-01), Blanie et al.
patent: 3802419 (1974-04-01), Yates
patent: 3976052 (1976-08-01), Junginger et al.
patent: 4137908 (1979-02-01), Degonde et al.
patent: 4248240 (1981-02-01), Eykern

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