Sine saturation transform

• US 20080045810A1
• Filed: 08/20/2007
• Published: 02/21/2008
• Est. Priority Date: 06/29/2001
• Status: Active Grant

• Current Assignee: Ammar Al-All, Lorenzo Cazzoll, Walter Weber
• Original Assignee: Ammar Al-All, Lorenzo Cazzoll, Walter Weber
• Inventors: Al-All, Ammar, Weber, Walter, Cazzoll, Lorenzo
• Granted Patent: US 7,467,002 B2
• Time in Patent Office: Days
• US Class Current: 600/300
• 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 sine saturation transform method for filtering a physiological signal to improve a calculation of a physiological parameter, the sine saturation transform method comprising:

obtaining a signal comprising pulse rate information;

determining at least one sinusoidal wave that upon combination produces a predetermined response;

filtering the signal based on a frequency of the at least one sinusoidal wave; and

calculating a physiological parameter from the filtered signal.

2. The method of claim 1, comprising generating one or more sinusoidal waves.

3. The method of claim 2, comprising individually canceling the generated sinusoidal waves from the signal.

4. The method of claim 1, comprising determining a frequency corresponding to the sinusoidal wave which produces an extrema.

5. The method of claim 1, wherein the physiological parameter comprises one or more of blood oxygen saturation, blood glucose, carboxyhemoglobin, and blood pressure.

6. The method of claim 1, comprising segmenting the signal into at least one pulse rate cycle.