公开(公告)号：AU6441194A

公开(公告)日：1994-10-24

申请号：AU6441194

申请日：1994-03-21

Applicant: NELLCOR PURITAN BENNETT INCORPORATED

Inventor： SWEDLOW DAVID B ,  POTRATZ ROBERT S

IPC: G01N21/35 ,  A61B5/00 ,  A61B5/11 ,  A61B5/145 ,  A61B5/1455

Abstract: A pulse oximeter which modifies the alarm condition when motion is detected. Basically, if the lack of a pulse is determined to be as a result of motion artifact, the generation of an alarm is postponed. In addition, the display indicates that motion is present and that the last reading is questionable due to the presence of motion. The invention also determines if motion artifact is present from the pulse oximeter detector signal itself. The ratio of the positive and negative peaks of the derivative of the pulse signal are compared to a motion/blood pulse threshold.