Surgery – Truss – Pad
Patent
1989-02-16
1990-07-03
Sykes, Angela D.
Surgery
Truss
Pad
128680, A61B 50225
Patent
active
049382276
ABSTRACT:
A method and apparatus for measuring blood pressure of a subject based on Korotkoff sounds which are produced synchronously with heartbeat of the subject by pressing a body portion of the subject. The method including the steps of detecting the Korotkoff sounds by a microphone, the microphone generating electric signal corresponding to the detected Korotkoff sounds in a whole frequency range thereof; separating from the electric signal a signal component corresponding to the Korotkoff sounds in a comparatively high frequency range out of the whole frequency range; measuring, regarding the signal component, time of occurrence of at least one Korotkoff sound in the comparatively high frequency range; determining at least one time window regarding the electric signal, based on the time of occurrence measured regarding the signal component, the at least one time window consisting of a time interval smaller than a time period of occurrence of the Korotkoff sounds; and collecting a Korotkoff sound occurring in the time interval of each of the at least one time window determined regarding the electric signal, the collected Korotkoff sound being utilized for determining the blood pressure of the subject.
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patent: 4635645 (1987-01-01), Fukushima
Niwa Minoru
Yokoe Hifumi
Colin Electronics Co., Ltd.
Sykes Angela D.
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