公开(公告)号：AU2005221642A1

公开(公告)日：2005-09-22

申请号：AU2005221642

申请日：2005-03-07

Applicant: NELLCOR PURITAN BENNETT INCORPORATED

Inventor： BAKER CLARK R JR

IPC: A61B5/024

Abstract: A pulse oximeter which determines multiple heart rates, and selects between them based on the metrics of only one of the heart rate calculations. A primary heart rate calculation method is selected, and is used unless its metrics indicate questionable accuracy, in which case an alternative rate calculation is available and is used instead.

公开(公告)号：AU7845794A

公开(公告)日：1995-05-04

申请号：AU7845794

申请日：1994-09-28

Applicant: NELLCOR PURITAN BENNETT INCORPORATED

Inventor： BAKER CLARK R JR

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

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.

公开(公告)号：AU2005221673A1

公开(公告)日：2005-09-22

申请号：AU2005221673

申请日：2005-03-08

Applicant: NELLCOR PURITAN BENNETT INCORPORATED

Inventor： DEBRECZENY MARTIN ,  BAKER CLARK R JR

IPC: A61B5/00 ,  A61B5/024

Abstract: A method and an apparatus for measuring a physiological parameter, functioning based on obtaining a first signal derived from electromagnetic energy transmitted through a tissue portion at a first wavelength, the first signal including a signal portion corresponding with motion-related events and a signal portion corresponding with arterial pulsation events, where at the first wavelength water is a dominant absorber of electromagnetic energy in the tissue portion; obtaining a second signal derived from electromagnetic energy transmitted through a tissue portion at a second wavelength, the second signal including a signal portion corresponding with motion-related events and a signal portion corresponding with arterial pulsation events, where at the second wavelength hemoglobin is a dominant absorber of electromagnetic energy in the tissue portion; and combining the first signal and the second signal to generate a combined plethysmograph signal, such that the combined signal has a signal portion corresponding with motion-related events that is smaller than that present in the first signal or the second signal.

公开(公告)号：AU2005221653A1

公开(公告)日：2005-09-22

申请号：AU2005221653

申请日：2005-03-07

Applicant: NELLCOR PURITAN BENNETT INCORPORATED

Inventor： BAKER CLARK R JR

IPC: A61B5/00

Abstract: A method and device for detecting the presence of mixed venous and arterial blood pulsation in tissue, including receiving first and second electromagnetic radiation signals from a blood perfused tissue portion corresponding to infrared and red wavelengths of light, obtaining a measure of a phase difference between the first and second electromagnetic radiation signals, comparing the measure with a threshold value to form a comparison, and detecting the presence or absence of venous pulsation using the comparison.

公开(公告)号：AU2005221652A1

公开(公告)日：2005-09-22

申请号：AU2005221652

申请日：2005-03-07

Applicant: NELLCOR PURITAN BENNETT INCORPORATED

Inventor： BAKER CLARK R JR

IPC: A61B5/00

Abstract: A method of ensemble averaging signals in a pulse oximeter comprises receving first and second electromagnetic radiation signals from a blood perfused tissue portion corresponding to two different wavelengths of light, obtaining an assessment of the signal quality of said electromagnetic signals, selecting weights for an ensemble averager using said assessment of signal quality, and ensemble averaging said electromagnetic signals using said ensemble averager.

公开(公告)号：AU2005221651A1

公开(公告)日：2005-09-22

申请号：AU2005221651

申请日：2005-03-07

Applicant: NELLCOR PURITAN BENNETT INCORPORATED

Inventor： BAKER CLARK R JR

IPC: A61B5/00 ,  G01N21/31

Abstract: The use of two separate ensemble averagers for processing a detected waveform for use in calculating oxygen saturation and a pulse rate. The ensemble averager used for calculating oxygen saturation operates on a signal which has been normalized, while the ensemble averager for the pulse rate calculation operates on a signal which has not been normalized. The metrics chosen for the two paths through the two ensemble averagers can be varied to optimize the ensemble averaging for oxygen saturation or pulse rate calculations.

公开(公告)号：AU5011899A

公开(公告)日：1999-12-02

申请号：AU5011899

申请日：1999-09-23

Applicant: NELLCOR PURITAN BENNETT INCORPORATED

Inventor： BAKER CLARK R JR

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