최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0842128 (2007-08-20) |
등록번호 | US-8180420 (2012-05-15) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 | 피인용 횟수 : 244 인용 특허 : 329 |
A method and an apparatus to analyze two measured signals that are modeled as containing desired and undesired portions such as noise, FM and AM modulation. Coefficients relate the two signals according to a model defined in accordance with the present invention. In one embodiment, a transformation
A method and an apparatus to analyze two measured signals that are modeled as containing desired and undesired portions such as noise, FM and AM modulation. Coefficients relate the two signals according to a model defined in accordance with the present invention. In one embodiment, a transformation is used to evaluate a ratio of the two measured signals in order to find appropriate coefficients. The measured signals are then fed into a signal scrubber which uses the coefficients to remove the unwanted portions. The signal scrubbing is performed in either the time domain or in the frequency domain. The method and apparatus are particularly advantageous to blood oximetry and pulserate measurements. In another embodiment, an estimate of the pulserate is obtained by applying a set of rules to a spectral transform of the scrubbed signal. In another embodiment, an estimate of the pulserate is obtained by transforming the scrubbed signal from a first spectral domain into a second spectral domain. The pulserate is found by identifying the largest spectral peak in the second spectral domain.
1. A noninvasive physiological monitor comprising: a signal processor communicating with a detector responsive to light attenuated by body tissue, said detector producing a detector output waveform, said signal processor receiving said detector output waveform and configured to transform said detect
1. A noninvasive physiological monitor comprising: a signal processor communicating with a detector responsive to light attenuated by body tissue, said detector producing a detector output waveform, said signal processor receiving said detector output waveform and configured to transform said detector output waveform into spectral data, said signal processor further configured to identify spectral peaks and frequencies corresponding to said spectral peaks from said spectral data, and configured to apply a plurality of rules to said spectral peaks and said corresponding frequencies in order to determine pulse rate estimate. 2. The noninvasive physiological monitor of claim 1, further comprising sorting said series of spectral peaks by amplitude. 3. The noninvasive physiological monitor of claim 1, wherein at least one of said plurality of rules comprises identifying the three largest peaks by amplitude. 4. The noninvasive physiological monitor of claim 1, wherein at least one of said plurality of rules compares amplitude information and frequency information about said spectral peaks. 5. The noninvasive physiological monitor of claim 1, wherein at least one of said plurality of rules determines whether one or more of the spectral peaks are harmonics of others of the spectral peaks. 6. The noninvasive physiological monitor of claim 1, wherein at least one of said plurality of rules determines whether at least one of the spectral peaks falls within a predetermined range. 7. The noninvasive physiological monitor of claim 1, wherein at least one of said plurality of rules determines whether a frequency corresponding to at least one of the spectral peaks falls within a predetermined range. 8. A method of electronically calculating a physiological parameter in a patient comprising the steps of: transmitting light through tissue having flowing blood;detecting said light after it has passed through said tissue;generating an output signal indicative of the intensity of said light after attenuation;transforming the output signal into spectral data;identifying spectral peaks and frequencies corresponding the spectral peaks from the spectral data; andcalculating an estimate of pulse rate by applying a plurality of rules to the spectral peaks and the corresponding frequencies. 9. The method of electronically calculating a physiological parameter of claim 8 wherein the first wavelength is in a red light spectrum. 10. The method of electronically calculating a physiological parameter of claim 8 wherein the second wavelength is in an infrared light spectrum.
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