Surgery – Diagnostic testing – Respiratory
Patent
1996-06-26
1999-04-20
Kamm, William E.
Surgery
Diagnostic testing
Respiratory
607 42, A61B 502, A61B 508
Patent
active
058953604
ABSTRACT:
A gain control method for providing a gain controlled signal representative of a periodic physiological parameter of a patient includes providing a signal characteristic of the periodic physiological parameter. The periodic physiological parameter includes a plurality of periodic cycles. Gain of the signal is updated only once per periodic cycle following detection of a periodic event. The updating is performed by monitoring an amplitude of the signal between detection of periodic events and comparing the amplitude to a gain control amplitude threshold. Gain of the signal is updated as a function of the comparison. Further, gain is updated following expiration of a predetermined period of time if a periodic event is not detected within the predetermined period of time. The physiological parameter may be respiratory effort. An apparatus for providing such gain control is also provided.
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Christopherson Mark A.
Neisz Johann J.
Forrest Peter
Kamm William E.
Layno Carl H.
Medtronic Inc.
Patton Harold R.
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