Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1997-02-19
1998-11-17
Kramm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
600515, A61N 136, A61N 1362, A61B 504, A61B 50402
Patent
active
058369821
ABSTRACT:
A system and method of non-linear sampling of an analog signal, and for data compression, to provide overall compressed digital representative of analog signal such as a physiological signal obtained in a battery powered device such as an implantable pacemaker. Non-linear sampling is provided by generating a time varying threshold signal against which the analog signal is compared every clock sample, with the sample being skipped if the input analog signal does not exceed the threshold signal. The threshold signal can be either analog or a plurality of discrete levels, enabling up to a predetermined maximum number of samples to be skipped. The non-linearly sampled data is further compressed, using lossless techniques for compressing both the amplitude data and the data representative of skipped samples, to provide data for decompression. In a specific pacemaker embodiment, the data compression system recognizing a marker channel event, and includes data representative of the time and type of marker channel event.
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Muhlenberg Lambert
Weijand Keon
Jaro Michael J.
Kramm William E.
Layno Carl H.
Medtronic Inc.
Patton Harold
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