Method and apparatus for storing signals in an implantable medic

Details Method and apparatus for storing signals in an implantable medic Method and apparatus for storing signals in an implantable medic

1997-03-03

1998-11-17

Kamm, William E.

Surgery

Diagnostic testing

Cardiovascular

600515, 607 9, A61B 504, G01D 112

Patent

active

058368892

ABSTRACT:
A method of storing signals having a course over time in an implantable medical device, and/or transmitting the signals out of the device and out of the patient's body, with the course over time being detected in the device, particularly at predetermined time intervals with a constant sampling interval, and a sequence of signal samples being obtained therefrom, of which a partial quantity is stored and/or transmitted as the result of a selection made with a predetermined selection criterion, with the selection criterion being the first derivation of the course over time of the signals according to time, and with the selection being made such that the first derivation of the straight-line connection between an nth and the (n-1)th signal sample is determined and compared to the first derivation of the straight-line connection between the (n-1)th signal sample and the last-stored and/or last-transmitted signal sample, and the nth signal sample is then stored and/or transmitted as the new last signal sample exactly when these first derivations differ by more than a predetermined value.

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S.M. Blanchard et al.: "Comparison of methods for adaptive sampling of caa electrograms and electrocardiograms". In: Medical & Biological Engineering & Computing; Jul. 1985; pp. 377-386.

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