公开(公告)号：WO1995010222A1

公开(公告)日：1995-04-20

申请号：PCT/US1994010979

申请日：1994-09-28

Applicant: NELLCOR INCORPORATED

Inventor： NELLCOR INCORPORATED ,  BAKER, Clark, R., Jr.

IPC: A61B05/00

CPC classification number: A61B5/14551 ,  A61B5/7207 ,  A61B5/7239

Abstract: The present invention provides an improved method and apparatus for more accurately calculating and measuring vital information such as oxygen saturation and pulse rate when an ECG signal is not available. Instead of using an ECG R-wave as a trigger to overlay optical pulses, a virtual trigger is generated based on the heart rate and used to overlay optical pulse data. The optical information from a number of periods is added together, with the beginning of each period being determined by the issuance of the virtual trigger. In this way, the maximum and minimum of the optical signal should be lined up with each other in each period and added together to give a cumulative maximum and minimum. This enables precise identification of the maximum and minimum of the signal, and thus allows calculation of the oxygen saturation at that point.

Abstract translation: 本发明提供了一种改进的方法和装置，用于在ECG信号不可用时更准确地计算和测量诸如氧饱和度和脉搏率之类的重要信息。 代替使用ECG R波作为覆盖光脉冲的触发器，基于心率产生虚拟触发并用于覆盖光脉冲数据。 来自多个周期的光学信息被加在一起，每个周期的开始由虚拟触发的发出确定。 以这种方式，光信号的最大和最小值应在每个周期内相互排列，并加在一起以给出累积最大值和最小值。 这使得能够精确地识别信号的最大和最小值，因此允许在该点计算氧饱和度。