A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
73/3, 349/36, 35
A61B 5/02 (2006.01) A61B 5/022 (2006.01) A61B 7/04 (2006.01) G06F 17/00 (2006.01)
Patent
CA 1114638
ABSTRACT This invention relates generally to improvements in methods and apparatus for the measurement of blood pressure and heart rate. Conventional blood pressure measurement procedures are prone to a number of signi- ficant deficiencies. For example, the Korotkoff sounds may be of relatively low and difficult to detect ampli- tudes and are often intermixed and easily confused with ambignous signals generated by artifacts and both inter- nal and external noise. In addition, the determination of the end points for the onset and cessation of the Korotkoff sound pulse train is somewhat subjective. The present invention overcomes these deficiencies of the prior art by providing an electronic method and apparatus for automatically determining systolic and diastolic blood pressures and heart rate. Waveform analysis is first performed upon incoming Korotkoff signal waveforms by an analog prescreening subsystem to initially separate true Korotkoff sound signals from a variety of artifact and noise signals and to provide an output pulse stream correctly indicating Korotkoff sound occurrences in the time and blood pressure domain. The output Korotkoff sound pulse stream is then further analyzed by a digital processing subsystem to additionally remove any noise and artifact signals, to modify and certify the resultant data as either reliable or suspect, to determine heart rate and the most probable values for systolic and diastolic blood pressure levels indicated by the signal stream detected during the measurement cycle.
312855
Georgi Heinz W.
Alaris Medical Systems Inc.
Gowling Lafleur Henderson Llp
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