US 11,672,447 B2
Method and apparatus for calibration to reduce coupling between signals in a measurement system
Walter M. Weber, Laguna Hills, CA (US); Ammar Al-Ali, San Juan Capistrano, CA (US); Mohamed K. Diab, Ladera Ranch, CA (US); and Marcelo M. Lamego, Cupertino, CA (US)
Assigned to Masimo Corporation, Irvine, CA (US)
Filed by Masimo Corporation, Irvine, CA (US)
Filed on Aug. 13, 2020, as Appl. No. 16/993,101.
Application 16/993,101 is a continuation of application No. 15/834,965, filed on Dec. 7, 2017, granted, now 10,772,542.
Application 15/834,965 is a continuation of application No. 14/836,635, filed on Aug. 26, 2015, granted, now 9,861,305, issued on Jan. 9, 2018.
Application 14/836,635 is a continuation of application No. 13/526,376, filed on Jun. 18, 2012, abandoned.
Application 13/526,376 is a continuation of application No. 11/871,636, filed on Oct. 12, 2007, abandoned.
Claims priority of provisional application 60/851,112, filed on Oct. 12, 2006.
Prior Publication US 2021/0059576 A1, Mar. 4, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 5/1455 (2006.01); A61B 5/00 (2006.01); A61B 5/1495 (2006.01)
CPC A61B 5/1455 (2013.01) [A61B 5/1495 (2013.01); A61B 5/7228 (2013.01); A61B 2562/0238 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An apparatus for measuring one or more blood constituents in a subject, said apparatus comprising:
a first signal source which applies a first input signal during a first time interval;
a second signal source which applies a second input signal during a second time interval;
a third signal source which applies a third input signal during a third time interval;
a detector which detects a first parametric signal responsive to said first input signal passing through a portion of said subject having blood therein, a second parametric signal responsive to said second input signal passing through said portion of said subject, and a third parametric signal responsive to said third input signal passing through a portion of said subject having blood therein, said detector generating a detector output signal responsive to said first, second, and third parametric signals; and
a signal processor which receives said detector output signal, said signal processor configured to demodulate said detector output signal by applying a first demodulation signal to a signal responsive to said detector output signal to generate a first demodulator output signal, applying a second demodulation signal to said signal responsive to said detector output signal to generate a second demodulator output signal, and applying a third demodulation signal to said signal responsive to said detector output signal to generate a third demodulator output signal, said signal processor configured to select said first demodulation signal, said second demodulation signal and said third demodulation signal to reduce crosstalk between said first, second, and third demodulator signals using, at least in part, first and second calibration data, wherein said first calibration data comprises calibration data wherein said first signal source, said second signal source, and said third signal source are operated singly during a normal operation period, and wherein said second calibration data comprises calibration data wherein said first signal source, said second signal source, and said third signal source are not operated.