公开(公告)号：AU4666397A

公开(公告)日：1998-05-05

申请号：AU4666397

申请日：1997-10-02

Applicant: NELLCOR PURITAN BENNETT INCORPORATED

Inventor： CHIN RODNEY ,  MANNHEIMER PAUL ,  FLEWELLING ROSS

IPC: A61B5/145 ,  A61B5/00 ,  A61B5/1455 ,  A61B5/1464 ,  A61B5/1495

Abstract: A non-invasive optical sensor which uses the motion signal to calculate the physiological characteristic being measured. For pulse oximetry, a least squares or a ratio-of-ratios technique can be applied to the motion signal itself. This is made possible by selecting a site on the patient where variations in motion produce signals of two wavelengths which are sufficiently correlated. In particular, it has been determined that a sensor placed on a nail, in particular a thumbnail, exhibits the characteristics of having the red and infrared signals correlated when used for pulse oximetry, and the resulting signals correlate to arterial oxygen saturation.