Document Type and Number:
Japanese Patent JPS4957686
Kind Code:
A
Abstract:
Apparatus for monitoring the heartbeat rate of a patient comprising deriving, with pulse forming circuitry, electrical signals representative of heartbeat activity on a beat-to-beat data basis, a gating unit for normally passing the electrical signals, a first unit analyzing three successive ones of the electrical signals by a pair of credence checkers each having a preselected frequency tolerance to define a first criterion for distinguishing valid data and artifact and inhibiting operation of the gating unit upon detection of artifact, and a storage unit for receiving and averaging valid data over a period of three successive heartbeats to provide an output indicative of heartbeat rate. A second analyzing unit compares the third one of said signals with the last passed good data to define a second criterion for distinguishing valid data and artifact and upon detection of valid data inhibiting any effect on the gating unit by the first analyzer unit. Passed values are averaged and displayed and a visible indication denotes occurrence of an artifact.
Application Number:
JP7890073A
Publication Date:
June 04, 1974
Filing Date:
July 12, 1973
Export Citation:
International Classes:
A61B5/0245; A61B5/024; A61B8/00; A61B8/02; (IPC1-7): A61B5/02