Patents Assigned to Nellcor Puritan Bennett
  • METHODS AND SYSTEMS FOR DETERMINING PHYSIOLOGICAL INFORMATION USING MODULATED SIGNALS
    Publication number: 20140073863
    Abstract: A physiological monitoring system may process a physiological signal such a photoplethysmograph signal from a subject. The system may determine physiological information, such as a physiological rate, from the physiological signal. The system may use search techniques and qualification techniques to determine one or more initialization parameters. The initialization parameters may be used to calculate and qualify a physiological rate. The system may use signal conditioning to reduce noise in the physiological signal and to improve the determination of physiological information. The system may use qualification techniques to confirm determined physiological parameters. The system may also use autocorrelation techniques, cross-correlation techniques, fast start techniques, and/or reference waveforms when processing the physiological signal.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: NELLCOR PURITAN BENNETT LLC
    Inventors: Pirow Engelbrecht, Fernando Rodriguez-Llorente
  • METHODS AND SYSTEMS FOR DETERMINING PHYSIOLOGICAL INFORMATION BASED ON A PEAK OF A CROSS-CORRELATION
    Publication number: 20140073870
    Abstract: A physiological monitoring system may process a physiological signal such a photoplethysmograph signal from a subject. The system may determine physiological information, such as a physiological rate, from the physiological signal. The system may use search techniques and qualification techniques to determine one or more initialization parameters. The initialization parameters may be used to calculate and qualify a physiological rate. The system may use signal conditioning to reduce noise in the physiological signal and to improve the determination of physiological information. The system may use qualification techniques to confirm determined physiological parameters. The system may also use autocorrelation techniques, cross-correlation techniques, fast start techniques, and/or reference waveforms when processing the physiological signal.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: NELLCOR PURITAN BENNETT LLC
    Inventors: Pirow Engelbrecht, Fernando Rodriguez-Llorente, Nicholas James Wooder
  • METHODS AND SYSTEMS FOR CONDITIONING PHYSIOLOGICAL INFORMATION USING A NORMALIZATION TECHNIQUE
    Publication number: 20140073935
    Abstract: A physiological monitoring system may determine physiological information, such as physiological rate information, from a physiological signal. The system may condition the physiological signal to assist in the determination of the physiological information. The system may generate a positive signal and a negative signal based on respective positive and negative values of the physiological signal. The system may filter the positive and negative signals, combine the filtered signals, and modify the physiological signal based on the combined signal. The physiological signal may be modified, for example, by subtracting the combined signal from the physiological signal.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: NELLCOR PURITAN BENNETT LLC
    Inventors: Fernando Rodriguez-Llorente, Pirow Engelbrecht, Nicholas James Wooder
  • METHODS AND SYSTEMS FOR SELECTIVELY FILTERING A PHYSIOLOGICAL SIGNAL
    Publication number: 20140073862
    Abstract: A physiological monitoring system may determine physiological information, such as physiological rate information, from a physiological signal. The system may apply a digital filter to the physiological signal to assist in the determination of the physiological information. The system may determine a metric based on the physiological signal, and selectively apply the digital filter to the physiological signal based on the metric. The digital filter, which may include two or more filter coefficients, may correspond to a weighted sum of the physiological signal and a difference signal corresponding to the physiological signal. The filter coefficients may be adjustable, allowing selectivity in the characteristics of the digital filter between weighting the physiological signal and difference signal.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: NELLCOR PURITAN BENNETT LLC
    Inventors: Fernando Rodriguez-Llorente, Pirow Engelbrecht, Nicholas James Wooder
  • METHODS AND SYSTEMS FOR DETERMINING NOISE INFORMATION FROM A PHYSIOLOGICAL SIGNAL
    Publication number: 20140073874
    Abstract: A physiological monitoring system may determine physiological information, such as physiological rate information, and other information, such as noise information, from a physiological signal. The system may generate a difference signal based on the physiological signal and sort the difference signal to generate a sorted difference signal. The system may determine slope values for multiple segments of the sorted difference signal. The system may determine two end groups of the segments and determine at least one threshold based on the end groups. One or more end data points of the sorted difference signal may be identified as being associated with noise based on the at least one threshold. The system may determine a value indicative of noise based on the identified data points.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: NELLCOR PURITAN BENNETT LLC.
    Inventors: Fernando Rodriguez-Llorente, Pirow Engelbrecht, Nicholas James Wooder
  • METHODS AND SYSTEMS FOR DETERMINING PHYSIOLOGICAL INFORMATION BASED ON A COMBINED AUTOCORRELATION SEQUENCE
    Publication number: 20140073960
    Abstract: A physiological monitoring system may process a physiological signal such a photoplethysmograph signal from a subject. The system may determine physiological information, such as a physiological rate, from the physiological signal. The system may use search techniques and qualification techniques to determine one or more initialization parameters. The initialization parameters may be used to calculate and qualify a physiological rate. The system may use signal conditioning to reduce noise in the physiological signal and to improve the determination of physiological information. The system may use qualification techniques to confirm determined physiological parameters. The system may also use autocorrelation techniques, cross-correlation techniques, fast start techniques, and/or reference waveforms when processing the physiological signal.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: NELLCOR PURITAN BENNETT LLC
    Inventors: Fernando Rodriguez-Llorente, Nicholas James Wooder
  • METHODS AND SYSTEMS FOR QUALIFYING A CALCULATED VALUE BASED ON DIFFERENTLY SIZED SORTED DIFFERENCE SIGNALS
    Publication number: 20140073945
    Abstract: A physiological monitoring system may determine physiological information, such as physiological rate information, from a physiological signal. The system may receive a calculated value indicative of a period associated with a physiological rate. The system may generated a first sorted difference signal based on a segment of the physiological signal having a size corresponding to the period. The system may generate second and third sorted difference signals based on segments of the physiological signal having sizes corresponding to a fraction of the period and a multiple of the period. The system may analyze the first, second, and third sorted difference signals, and qualify or disqualify the calculated value based on the analysis.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: Nellcor Puritan Bennett LLC
    Inventors: Fernando Rodriguez-Llorente, Pirow Engelbrecht, Nicholas James Wooder
  • METHODS AND SYSTEMS FOR DETERMINING PHYSIOLOGICAL INFORMATION BASED ON THRESHOLD CROSSINGS OF AN AUTOCORRELATION SEQUENCE
    Publication number: 20140073975
    Abstract: A physiological monitoring system may process a physiological signal such a photoplethysmograph signal from a subject. The system may determine physiological information, such as a physiological rate, from the physiological signal. The system may use search techniques and qualification techniques to determine one or more initialization parameters. The initialization parameters may be used to calculate and qualify a physiological rate. The system may use signal conditioning to reduce noise in the physiological signal and to improve the determination of physiological information. The system may use qualification techniques to confirm determined physiological parameters. The system may also use autocorrelation techniques, cross-correlation techniques, fast start techniques, and/or reference waveforms when processing the physiological signal.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: NELLCOR PURITAN BENNETT LLC
    Inventors: Pirow Engelbrecht, Fernando Rodriguez-Llorente, Nicholas James Wooder
  • METHODS AND SYSTEMS FOR DETERMINING PHYSIOLOGICAL INFORMATION BASED ON A CLASSIFICATION OF A PHYSIOLOGICAL SIGNAL
    Publication number: 20140073955
    Abstract: A physiological monitoring system may process a physiological signal such a photoplethysmograph signal from a subject. The system may determine physiological information, such as a physiological rate, from the physiological signal. The system may use search techniques and qualification techniques to determine one or more initialization parameters. The initialization parameters may be used to calculate and qualify a physiological rate. The system may use signal conditioning to reduce noise in the physiological signal and to improve the determination of physiological information. The system may use qualification techniques to confirm determined physiological parameters. The system may also use autocorrelation techniques, cross-correlation techniques, fast start techniques, and/or reference waveforms when processing the physiological signal.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: NELLCOR PURITAN BENNETT LLC
    Inventors: Pirow Engelbrecht, Fernando Rodriguez-Llorente
  • SYSTEM AND METHOD FOR DETERMINING STROKE VOLUME OF A PATIENT
    Publication number: 20140073962
    Abstract: A PPG system for determining a stroke volume of a patient includes a PPG sensor configured to be secured to an anatomical portion of the patient. The PPG sensor is configured to sense a physiological characteristic of the patient. The PPG system may include a monitor operatively connected to the PPG sensor. The monitor receives a PPG signal from the PPG sensor. The monitor includes a pulse trending module determining a slope transit time of an upslope of a primary peak of the PPG signal. The pulse trending module determines a stroke volume of the patient as a function of the slope transit time.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: Nellcor Puritan Bennett LLC
    Inventors: Paul Stanley Addison, James Nicholas Watson
  • METHODS AND SYSTEMS FOR QUALIFYING CALCULATED VALUES BASED ON STATE TRANSITIONS
    Publication number: 20140073941
    Abstract: A physiological monitoring system may determine physiological information, such as physiological rate information, from a physiological signal. The system may receive a calculated value indicative of a physiological rate. Based on the value, the system may select pairs of values of the physiological signal that are particularly spaced. The system may determine a state for each pair of values. The state may correspond to a set of criteria such as, for example, equalities, inequalities, logical operators, or other criteria. The system may determine a number of state transitions based on the determined states, and qualify or disqualify the calculated value based on the number of state transitions.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: NELLCOR PURITAN BENNETT LLC
    Inventors: Fernando Rodriguez-Llorente, Pirow Engelbrecht, Nicholas James Wooder
  • METHODS AND SYSTEMS FOR QUALIFYING A CORRELATION LAG VALUE BASED ON SKEWNESS
    Publication number: 20140073942
    Abstract: A physiological monitoring system may determine physiological information, such as physiological rate information, from a physiological signal. The system may determine a skew metric based on the physiological signal. The system may also determine a correlation lag value corresponding to a peak in a correlation sequence derived from the physiological signal. The system may qualify or disqualify the correlation lag value based on the skew metric. The system may, for example, compare the skew metric and the correlation lag value to a reference set of skew metric values and correlation lag values to determine whether to qualify or disqualify the correlation lag value.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: NELLCOR PURITAN BENNETT LLC
    Inventors: Fernando Rodriguez-Llorente, Pirow Engelbrecht, Nicholas James Wooder
  • METHODS AND SYSTEMS FOR QUALIFYING PHYSIOLOGICAL VALUES BASED ON TWO SEGMENTS
    Publication number: 20140073968
    Abstract: A physiological monitoring system may process a physiological signal such a photoplethysmograph signal from a subject. The system may determine physiological information, such as a physiological rate, from the physiological signal. The system may use search techniques and qualification techniques to determine one or more initialization parameters. The initialization parameters may be used to calculate and qualify a physiological rate. The system may use signal conditioning to reduce noise in the physiological signal and to improve the determination of physiological information. The system may use qualification techniques to confirm determined physiological parameters. The system may also use autocorrelation techniques, cross-correlation techniques, fast start techniques, and/or reference waveforms when processing the physiological signal.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: NELLCOR PURITAN BENNETT LLC
    Inventors: Pirow Engelbrecht, Fernando Rodriguez-Llorente, Nicholas James Wooder
  • METHODS AND SYSTEMS FOR DETERMINING PHYSIOLOGICAL INFORMATION USING STATUS INDICATORS
    Publication number: 20140073869
    Abstract: A physiological monitoring system may determine physiological information, such as physiological rate information, from a physiological signal. The system may generate a window of physiological data, and determine the physiological information based on the window of data. The system may use status indicators to determine when the window of data is to be updated with new data. The status indicator may include, for example, a gain change indicator, indicating a change in gain in an amplifier. Based on the status indicator, the system may, for example, set a period of time during which current physiological data is not added to the window of data. The system may smooth the transition of the physiological data before and after the period of time.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: Nellcor Puritan Bennett LLC
    Inventors: Fernando Rodriguez-Llorente, Pirow Engelbrecht, Nicholas James Wooder
  • METHODS AND SYSTEMS FOR DETERMINING PHYSIOLOGICAL INFORMATION BASED ON FAST START PARAMETERS
    Publication number: 20140073864
    Abstract: A physiological monitoring system may process a physiological signal such a photoplethysmograph signal from a subject. The system may determine physiological information, such as a physiological rate, from the physiological signal. The system may use search techniques and qualification techniques to determine one or more initialization parameters. The initialization parameters may be used to calculate and qualify a physiological rate. The system may use signal conditioning to reduce noise in the physiological signal and to improve the determination of physiological information. The system may use qualification techniques to confirm determined physiological parameters. The system may also use autocorrelation techniques, cross-correlation techniques, fast start techniques, and/or reference waveforms when processing the physiological signal.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: NELLCOR PURITAN BENNETT LLC
    Inventors: Pirow Engelbrecht, Fernando James Rodriguez-Llorente, Nicholas James Wooder
  • METHODS AND SYSTEMS FOR DETERMINING PHYSIOLOGICAL INFORMATION BASED ON LOW AND HIGH FREQUENCY COMPONENTS
    Publication number: 20140073967
    Abstract: A physiological monitoring system may process a physiological signal such a photoplethysmograph signal from a subject. The system may determine physiological information, such as a physiological rate, from the physiological signal. The system may use search techniques and qualification techniques to determine one or more initialization parameters. The initialization parameters may be used to calculate and qualify a physiological rate. The system may use signal conditioning to reduce noise in the physiological signal and to improve the determination of physiological information. The system may use qualification techniques to confirm determined physiological parameters. The system may also use autocorrelation techniques, cross-correlation techniques, fast start techniques, and/or reference waveforms when processing the physiological signal.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: NELLCOR PURITAN BENNETT LLC
    Inventors: Pirow Engelbrecht, Fernando James Rodriguez-Llorente, Nicholas James Wooder
  • METHODS AND SYSTEMS FOR CONDITIONING PHYSIOLOGICAL INFORMATION USING A NORMALIZATION TECHNIQUE
    Publication number: 20140073937
    Abstract: A physiological monitoring system may determine physiological information, such as physiological rate information, from a physiological signal. The system may condition the physiological signal to assist in the determination of the physiological information. The system may generate absolute values of the physiological signal, filter the absolute values, and modify the physiological signal based on the filtered signal. The filtered signal may be shifted in amplitude prior to modifying the physiological signal. The modification may include dividing the physiological signal by the filtered signal to normalize the physiological signal.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: NELLCOR PURITAN BENNETT LLC
    Inventors: Fernando Rodriguez-Llorente, Pirow Engelbrecht, Nicholas James Wooder
  • SYSTEMS AND METHODS FOR DETERMINING FLUID RESPONSIVENESS
    Publication number: 20140073889
    Abstract: A system is provided including a ventilator detection module, a circulatory detection module, and an analysis module. The ventilator detection module is configured to detect ventilator information representative of a ventilation activity. The circulatory detection module is configured to detect circulatory information representative of the circulation of the patient. The analysis module is configured to obtain a ventilator waveform based at least in part on the ventilator information, obtain a circulatory waveform based at least in part on the circulatory information, combine the ventilator waveform and the circulatory waveform to provide a mixed waveform, and isolate a portion of the mixed waveform to identify a ventilator responsiveness waveform representative of an effect of the ventilator.
    Type: Application
    Filed: September 12, 2012
    Publication date: March 13, 2014
    Applicant: Nellcor Puritan Bennett LLC
    Inventors: Mark Su, Bo Chen
  • METHODS AND SYSTEMS FOR DETERMINING PHYSIOLOGICAL INFORMATION BASED ON FAILURE INFORMATION
    Publication number: 20140073949
    Abstract: A physiological monitoring system may process a physiological signal such a photoplethysmograph signal from a subject. The system may determine physiological information, such as a physiological rate, from the physiological signal. The system may use search techniques and qualification techniques to determine one or more initialization parameters. The initialization parameters may be used to calculate and qualify a physiological rate. The system may use signal conditioning to reduce noise in the physiological signal and to improve the determination of physiological information. The system may use qualification techniques to confirm determined physiological parameters. The system may also use autocorrelation techniques, cross-correlation techniques, fast start techniques, and/or reference waveforms when processing the physiological signal.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: NELLCOR PURITAN BENNETT LLC
    Inventors: Pirow Engelbrecht, Fernando Rodriguez-Llorente, Nicholas James Wooder
  • METHODS AND SYSTEMS FOR QUALIFYING CALCULATED VALUES BASED ON MULTIPLE DIFFERENCE SIGNALS
    Publication number: 20140073943
    Abstract: A physiological monitoring system may determine physiological information, such as physiological rate information, from a physiological signal. The system may receive a calculated value indicative of a physiological rate. The system may generate and sort multiple difference signals based on the physiological signal. The system may analyze a first sorted difference signal and a second sorted difference signal to determine at least one first metric, and analyze a third sorted difference signal and a fourth sorted difference signal to determine at least one second metric. The system may qualify or disqualify the calculated value based on the at least one first and second metrics. The segments used to generate the third and fourth sorted difference signals may, for example, be subsets of the segments used to generate the first and second sorted difference signals.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: NELLCOR PURITAN BENNETT LLC
    Inventors: Fernando Rodriguez-Llorente, Pirow Engelbrecht, Nicholas James Wooder