Surgery – Diagnostic testing – Cardiovascular
Patent
1997-06-18
1999-04-06
Kamm, William E.
Surgery
Diagnostic testing
Cardiovascular
128901, A61B 50456
Patent
active
058910484
ABSTRACT:
A signal detector for detecting a biosignal with approximately known morpogy in a complex input signal (ECG), in particular for the detection of QRS complexes in an electrocardiogram. The detector has circuitry for detecting the maximum amplitude (PEAK) of the detected signal complex within a predetermined time window, with a threshold value discriminator, a detector parameter preselection circuit for determining an initial value for the detector parameter characterizing the detector sensitivity, which parameter determines the detector threshold value when responding to a detection signal in dependence on the maximum amplitude and a detector parameter timing circuit for adjusting a predetermined time dependence of the detector parameter and thus the detection threshold value. The predetermined time dependence has at least in a first time domain a step-by-step reduction of the detection threshold value up to a lower limit value that is determined in dependence on the maximum amplitude and/or in a second time domain a step-by-step increase with preset steps (STEPS) up to an upper limit value determined in dependence on the maximum amplitude.
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Nigam Indra B.
Schaldach Max
Biotronik Mess -und Therapiegeraete GmbH & Co. Ingenieurbuero Be
Evaniswo George R.
Kamm William E.
Spencer George H.
Voorhees Catherine M.
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