SINE SATURATION TRANSFORM

• US 20140031650A1
• Filed: 07/29/2013
• Published: 01/30/2014
• Est. Priority Date: 06/29/2001
• Status: Active Grant

• Current Assignee: Masimo Corporation
• Original Assignee: Masimo Corporation
• Inventors: Weber, Walter M., Al-Ali, Ammar, Cazzoli, Lorenzo
• Granted Patent: US 8,892,180 B2
• Time in Patent Office: Days
• US Class Current: 600/323
• CPC Class Codes: A61B 5/024 Detecting, measuring or recording pulse rate or heart rate A61B5/0205, A61B5/021 take precedence
• CPC Class Codes: A61B 5/02433 for infrared radiation
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• 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 5/7282 Event detection, e.g. detecting unique waveforms indicative of a medical condition A61B5/4094, A61B5/4818, A61B5/349, A61B5/0823 take precedence

Abstract

A transform for determining a physiological measurement is disclosed. The transform determines a basis function index from a physiological signal obtained through a physiological sensor. A basis function waveform is generated based on basis function index. The basis function waveform is then used to determine an optimized basis function waveform. The optimized basis function waveform is used to calculate a physiological measurement.

Claims

1. A method of determining of a physiological parameter of a monitored patient attached to a noninvasive optical sensor, the method including electronically processing signals indicative of attenuation by body tissue of the patient, the method comprising:

receiving one or more signals indicative of light attenuated by body tissue of pulsing blood in said monitored patient, said one or more signals usable to determine measurements for one or more physiological parameters of said monitored patient;

electronically determining an initial frequency estimate related to said one or more physiological parameters;

electronically combining at least one sinusoidal waveform with said one or more of said signals to produce a predetermined signal response; and

electronically processing the combined signal to determine an output measurement of one or more of said one or more physiological parameters.