Surgery – Diagnostic testing – Measuring or detecting nonradioactive constituent of body...
Patent
1998-01-12
1999-07-06
O'Connor, Cary
Surgery
Diagnostic testing
Measuring or detecting nonradioactive constituent of body...
600336, A61B 500
Patent
active
059191341
ABSTRACT:
A method and an apparatus measure blood oxygenation in a subject. A first signal source applies a first input signal during a first time interval. A second signal source applies a second input signal during a second time interval. A detector detects a first parametric signal responsive to the first input signal passing through a portion of the subject having blood therein. The detector also detects a second parametric signal responsive to the second input signal passing through the portion of the subject. The detector generates a detector output signal responsive to the first and second parametric signals. A signal processor receives the detector output signal and demodulates the detector output signal by applying a first demodulation signal to a signal responsive to the detector output signal to generate a first output signal responsive to the first parametric signal. The signal processor applies a second demodulation signal to the signal responsive to the detector output signal to generate a second output signal responsive to the second parametric signal. The first demodulation signal and the second demodulation signal both include at least a first component having a first frequency and a first amplitude and a second component having a second frequency and a second amplitude. The second frequency is a harmonic of the first frequency. The second amplitude is related to the first amplitude to minimize crosstalk from the first parametric signal to the second output signal and to minimize crosstalk from the second parametric signal to the first output signal.
REFERENCES:
patent: Re35122 (1995-12-01), Corenman et al.
patent: 3638640 (1972-02-01), Shaw
patent: 3704706 (1972-12-01), Herczfeld et al.
patent: 4407290 (1983-10-01), Wilber
patent: 4773422 (1988-09-01), Isaacson et al.
patent: 4824242 (1989-04-01), Frick et al.
patent: 4848901 (1989-07-01), Hood, Jr.
patent: 4863265 (1989-09-01), Flower et al.
patent: 4867571 (1989-09-01), Frick et al.
patent: 4948248 (1990-08-01), Lehman
patent: 5349952 (1994-09-01), McCarthy et al.
patent: 5555882 (1996-09-01), Richardson et al.
Masimo Corp.
O'Connor Cary
Winakur Eric F.
LandOfFree
Method and apparatus for demodulating signals in a pulse oximetr does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for demodulating signals in a pulse oximetr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for demodulating signals in a pulse oximetr will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-895395