PHYSIOLOGICAL PARAMETER TRACKING SYSTEM

• US 20130274572A1
• Filed: 02/26/2013
• Published: 10/17/2013
• Est. Priority Date: 08/28/2003
• Status: Active Grant

• Current Assignee: Masimo Corporation
• Original Assignee: Masimo Corporation
• Inventors: Al-Ali, Ammar, Diab, Mohamed K., Weber, Walter M.
• Granted Patent: US 9,788,768 B2
• Time in Patent Office: Days
• US Class Current: 600/328
• CPC Class Codes: A61B 2560/0204 of power management
• CPC Class Codes: A61B 5/1455 using optical sensors, e.g. spectral photometrical oximeters
• CPC Class Codes: A61B 5/14551 for measuring blood gases
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/72 Signal processing specially adapted for physiological signals or for diagnostic purposes character recognition, recognising digital ink, document-oriented image-based pattern recognition G06V30/00; recognition or understanding of postal images G06V30/424

Abstract

A physiological parameter tracking system has a reference parameter calculator configured to provide a reference parameter responsive to a physiological signal input. A physiological measurement output is a physiological parameter derived from the physiological signal input during a favorable condition and an estimate of the physiological parameter according to the reference parameter during an unfavorable condition.

Claims

1. A physiological parameter tracking method comprising the steps of:

providing a noninvasive physiological sensor that detects light of at least first and second wavelengths transmitted through body tissue carrying pulsing blood;

inputting a physiological signal from the physiological sensor;

calculating a reference parameter responsive to the physiological signal;

calculating an ancillary parameter responsive to the physiological signal;

calculating a slow parameter based at least in part on the reference parameter and the ancillary parameter, wherein the slow parameter varies slowly in time relative to the reference parameter and the ancillary parameter; and

determining a physiological measurement responsive to the reference parameter and the slow parameter.

2. The method of claim 1, wherein the calculating said ancillary parameter comprises determining whether a calculation of the ancillary parameter is favorable, wherein the duration of an unfavorable calculation corresponds to a first time interval and the duration of a favorable calculation corresponds to a second time interval.

3. The method of claim 2, wherein the determining said physiological measurement further comprises calculating the physiological measurement as a function of the reference parameter and the slow parameter during the first time interval.

4. The method of claim 2, wherein the determining said physiological measurement further comprises outputting the ancillary parameter during the second time interval.

5. The method of claim 1, wherein the calculating said slow parameter further comprises generating a measure of the concentration of abnormal hemoglobin.

6. The method of claim 1, further comprising asserting an update command wherein, upon assertion, a value of the slow parameter is repeatedly generated.

7. The method of claim 1, further comprising asserting an update command wherein, upon assertion, a value of the slow parameter is held for a predetermined duration.

8. The method of claim 1, wherein the calculating said ancillary parameter further comprises repeatedly calculating venous oxygen saturation.