Patents by Inventor David W. Mortara

David W. Mortara has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20210259636
    Abstract: Systems and methods for monitoring the condition of electrodes used in biological signal measurement are provided. One method includes applying a first test signal having a first frequency to at least one of a plurality of electrodes and applying a second test signal having a second frequency to at least one of the plurality of electrodes. Both frequencies are below a frequency range associated with the biological signal. The method further includes capturing the biological signal while applying the plurality of test signals and generating an output signal that includes both the measured biological signal and the plurality of test signals. The method further includes retrieving an output amplitude for each of the plurality of test signals from the output signal and calculating an estimated impedance for each of the plurality of electrodes based on the retrieved output amplitudes of the plurality of test signals.
    Type: Application
    Filed: May 10, 2021
    Publication date: August 26, 2021
    Inventor: David W. Mortara
  • Patent number: 11000230
    Abstract: Systems and methods for monitoring the condition of electrodes used in biological signal measurement are provided. One method includes applying a first test signal having a first frequency to at least one of a plurality of electrodes and applying a second test signal having a second frequency to at least one of the plurality of electrodes. Both frequencies are below a frequency range associated with the biological signal. The method further includes capturing the biological signal while applying the plurality of test signals and generating an output signal that includes both the measured biological signal and the plurality of test signals. The method further includes retrieving an output amplitude for each of the plurality of test signals from the output signal and calculating an estimated impedance for each of the plurality of electrodes based on the retrieved output amplitudes of the plurality of test signals.
    Type: Grant
    Filed: March 12, 2018
    Date of Patent: May 11, 2021
    Assignee: Welch Allyn, Inc.
    Inventor: David W. Mortara
  • Publication number: 20210059610
    Abstract: This disclosure is directed towards detecting artifacts in an ECG signal. An ECG system may include multiple sensors which can sense an ECG signal when attached to a patient. Bipolar leads connect the sensors, and provide the ECG signal from the sensors to a computing device. The computing device receives respective signals from the bipolar leads, where the respective signals are indicative of the ECG signal. The computing device identifies, based on the respective signals, a potential artifact corresponding to a subset of the plurality of bipolar leads. The computing device determines that each lead of the subset of the plurality of bipolar leads is connected to a common sensor. The computing device may use signals originating from a remainder of the bipolar leads (e.g., the bipolar leads that are not connected to the sensor(s) where the artifact is detected) to detect a condition of the patient.
    Type: Application
    Filed: August 28, 2020
    Publication date: March 4, 2021
    Inventors: David W. Mortara, Patrick J. Noffke, Reyhaneh Sepehr
  • Patent number: 10722135
    Abstract: Systems and methods for measuring signals representative of muscle activity are provided. One method includes detecting an ECG signal through a plurality of electrodes. The ECG signal includes a plurality of ECG sample signals, and each ECG sample signal is a bipolar signal associated with two of the plurality of electrodes and includes a cardiac signal component and a myographic signal component. The method further includes filtering each of the ECG sample signals to remove at least a portion of the cardiac signal component and generate a combined myographic power signal for the two of the plurality of electrodes with which the ECG sample signal is associated. Each combined myographic power signal represents a myographic potential between the two electrodes. The method further includes calculating individual myographic power signals for each of the plurality of electrodes by applying the combined myographic power signals within a covariance matrix.
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: July 28, 2020
    Assignee: Welch Allyn, Inc.
    Inventor: David W. Mortara
  • Publication number: 20180199885
    Abstract: Systems and methods for monitoring the condition of electrodes used in biological signal measurement are provided. One method includes applying a first test signal having a first frequency to at least one of a plurality of electrodes and applying a second test signal having a second frequency to at least one of the plurality of electrodes. Both frequencies are below a frequency range associated with the biological signal. The method further includes capturing the biological signal while applying the plurality of test signals and generating an output signal that includes both the measured biological signal and the plurality of test signals. The method further includes retrieving an output amplitude for each of the plurality of test signals from the output signal and calculating an estimated impedance for each of the plurality of electrodes based on the retrieved output amplitudes of the plurality of test signals.
    Type: Application
    Filed: March 12, 2018
    Publication date: July 19, 2018
    Applicant: Mortara Instrument, Inc.
    Inventor: David W. Mortara
  • Patent number: 9913614
    Abstract: Systems and methods for monitoring the condition of electrodes used in biological signal measurement are provided. One method includes applying a first test signal having a first frequency to at least one of a plurality of electrodes and applying a second test signal having a second frequency to at least one of the plurality of electrodes. Both frequencies are below a frequency range associated with the biological signal. The method further includes capturing the biological signal while applying the plurality of test signals and generating an output signal that includes both the measured biological signal and the plurality of test signals. The method further includes retrieving an output amplitude for each of the plurality of test signals from the output signal and calculating an estimated impedance for each of the plurality of electrodes based on the retrieved output amplitudes of the plurality of test signals.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: March 13, 2018
    Assignee: MORTARA INSTRUMENT, INC.
    Inventor: David W. Mortara
  • Publication number: 20170172449
    Abstract: Systems and methods for measuring signals representative of muscle activity are provided. One method includes detecting an ECG signal through a plurality of electrodes. The ECG signal includes a plurality of ECG sample signals, and each ECG sample signal is a bipolar signal associated with two of the plurality of electrodes and includes a cardiac signal component and a myographic signal component. The method further includes filtering each of the ECG sample signals to remove at least a portion of the cardiac signal component and generate a combined myographic power signal for the two of the plurality of electrodes with which the ECG sample signal is associated. Each combined myographic power signal represents a myographic potential between the two electrodes. The method further includes calculating individual myographic power signals for each of the plurality of electrodes by applying the combined myographic power signals within a covariance matrix.
    Type: Application
    Filed: March 3, 2017
    Publication date: June 22, 2017
    Applicant: Mortara Instrument, Inc.
    Inventor: David W. Mortara
  • Patent number: 9585583
    Abstract: Systems and methods for measuring signals representative of muscle activity are provided. One method includes detecting an ECG signal through a plurality of electrodes. The ECG signal includes a plurality of ECG sample signals, and each ECG sample signal is a bipolar signal associated with two of the plurality of electrodes and includes a cardiac signal component and a myographic signal component. The method further includes filtering each of the ECG sample signals to remove at least a portion of the cardiac signal component and generate a combined myographic power signal for the two of the plurality of electrodes with which the ECG sample signal is associated. Each combined myographic power signal represents a myographic potential between the two electrodes. The method further includes calculating individual myographic power signals for each of the plurality of electrodes by applying the combined myographic power signals within a covariance matrix.
    Type: Grant
    Filed: March 4, 2014
    Date of Patent: March 7, 2017
    Assignee: MORTARA INSTRUMENT, INC.
    Inventor: David W. Mortara
  • Publication number: 20150327811
    Abstract: Systems and methods for monitoring the condition of electrodes used in biological signal measurement are provided. One method includes applying a first test signal having a first frequency to at least one of a plurality of electrodes and applying a second test signal having a second frequency to at least one of the plurality of electrodes. Both frequencies are below a frequency range associated with the biological signal. The method further includes capturing the biological signal while applying the plurality of test signals and generating an output signal that includes both the measured biological signal and the plurality of test signals. The method further includes retrieving an output amplitude for each of the plurality of test signals from the output signal and calculating an estimated impedance for each of the plurality of electrodes based on the retrieved output amplitudes of the plurality of test signals.
    Type: Application
    Filed: July 29, 2015
    Publication date: November 19, 2015
    Applicant: MORTARA INSTRUMENT, INC.
    Inventor: David W. Mortara
  • Patent number: 9113805
    Abstract: Systems and methods for monitoring the condition of electrodes used in biological signal measurement are provided. One method includes applying a first test signal having a first frequency to at least one of a plurality of electrodes and applying a second test signal having a second frequency to at least one of the plurality of electrodes. Both frequencies are below a frequency range associated with the biological signal. The method further includes capturing the biological signal while applying the plurality of test signals and generating an output signal that includes both the measured biological signal and the plurality of test signals. The method further includes retrieving an output amplitude for each of the plurality of test signals from the output signal and calculating an estimated impedance for each of the plurality of electrodes based on the retrieved output amplitudes of the plurality of test signals.
    Type: Grant
    Filed: March 4, 2013
    Date of Patent: August 25, 2015
    Assignee: MORTARA INSTRUMENT, INC.
    Inventor: David W. Mortara
  • Publication number: 20140247058
    Abstract: Systems and methods for monitoring the condition of electrodes used in biological signal measurement are provided. One method includes applying a first test signal having a first frequency to at least one of a plurality of electrodes and applying a second test signal having a second frequency to at least one of the plurality of electrodes. Both frequencies are below a frequency range associated with the biological signal. The method further includes capturing the biological signal while applying the plurality of test signals and generating an output signal that includes both the measured biological signal and the plurality of test signals. The method further includes retrieving an output amplitude for each of the plurality of test signals from the output signal and calculating an estimated impedance for each of the plurality of electrodes based on the retrieved output amplitudes of the plurality of test signals.
    Type: Application
    Filed: March 4, 2013
    Publication date: September 4, 2014
    Applicant: MORTARA INSTRUMENT, INC.
    Inventor: David W. Mortara
  • Patent number: 6850796
    Abstract: A method of identifying and measuring altemans in an electrocardiographic (ECG) signal representative of the electric activity of a heart of a patient. The ECG signals from the patient are divided into individual cardiac cycles and the amplitude of four segments of the repolarization portion and the depolarization portion of each cardiac cycle are measured. The amplitude for each of the repolarization segments are measured from a reference baseline that is determined by a first base segment occurring immediately prior to the repolarization portion of the present cardiac cycle and a second base segment occurring immediately before the depolarization portion of the next cardiac cycle in the sequence. Based upon the amplitude measurements over the repolarization and the depolarization portions of each cardiac cycle, digital signal processing is applied to the measurements to generate eigenvariables.
    Type: Grant
    Filed: August 8, 2000
    Date of Patent: February 1, 2005
    Inventor: David W. Mortara
  • Publication number: 20040176696
    Abstract: A method of identifying and measuring alternans in an electrocardiographic (ECG) signal representative of the electric activity of a heart of a patient. The ECG signals from the patient are divided into individual cardiac cycles and the amplitude of four segments of the repolarization portion and the depolarization portion of each cardiac cycle are measured. The amplitude for each of the repolarization segments are measured from a reference baseline that is determined by a first base segment occurring immediately prior to the repolarization portion of the present cardiac cycle and a second base segment occurring immediately before the depolarization portion of the next cardiac cycle in the sequence. Based upon the amplitude measurements over the repolarization and the depolarization portions of each cardiac cycle, digital signal processing is applied to the measurements to generate eigenvariables.
    Type: Application
    Filed: March 8, 2004
    Publication date: September 9, 2004
    Inventor: David W. Mortara
  • Patent number: 6697655
    Abstract: A low power pulse oximeter includes an input stage for amplifying a signal received from a light detector that is switchably connected to the power supply that powers the amplifier. The oximeter also includes an output stage with an LED driver circuit that is switchably connected to the power supply that powers the LED driver circuit. The input and output stages are switchably connected to the power supply when measurements need to be taken. When measurements do not need to be taken, they are switched off to reduce the power consumption of the oximeter.
    Type: Grant
    Filed: October 5, 2001
    Date of Patent: February 24, 2004
    Assignee: Mortara Instrument, Inc.
    Inventors: Brian E. Sueppel, David W. Mortara
  • Patent number: 6564077
    Abstract: An apparatus for determining the oxygenation of blood. The apparatus includes a detector that is configured to sense a first signal of a first wavelength, the first signal having a first arterial blood component and a first noise component. The detector is also configured to sense a second signal of a second wavelength, the second signal having a second arterial blood component and a second noise component. The first arterial blood component is related to the second arterial blood component by an arterial blood absorption ratio and the first noise component is related to the second noise component by a noise absorption ratio. The apparatus also includes a controller that is configured to determine a value of the noise absorption ratio that maximizes the magnitude of an autocorrelation function. The controller is further configured to determine the oxygenation of blood from the noise absorption ratio.
    Type: Grant
    Filed: October 10, 2001
    Date of Patent: May 13, 2003
    Assignee: Mortara Instrument, Inc.
    Inventor: David W. Mortara
  • Publication number: 20030069487
    Abstract: An apparatus for determining the oxygenation of blood. The apparatus includes a detector that is configured to sense a first signal of a first wavelength, the first signal having a first arterial blood component and a first noise component. The detector is also configured to sense a second signal of a second wavelength, the second signal having a second arterial blood component and a second noise component. The first arterial blood component is related to the second arterial blood component by an arterial blood absorption ratio and the first noise component is related to the second noise component by a noise absorption ratio. The apparatus also includes a controller that is configured to determine a value of the noise absorption ratio that maximizes the magnitude of an autocorrelation function. The controller is further configured to determine the oxygenation of blood from the noise absorption ratio.
    Type: Application
    Filed: October 10, 2001
    Publication date: April 10, 2003
    Applicant: Mortara Instrument, Inc.
    Inventor: David W. Mortara
  • Publication number: 20030069486
    Abstract: A low power pulse oximeter includes an input stage for amplifying a signal received from a light detector that is switchably connected to the power supply that powers the amplifier. The oximeter also includes an output stage with an LED driver circuit that is switchably connected to the power supply that powers the LED driver circuit. The input and output stages are switchably connected to the power supply when measurements need to be taken. When measurements do not need to be taken, they are switched off to reduce the power consumption of the oximeter.
    Type: Application
    Filed: October 5, 2001
    Publication date: April 10, 2003
    Applicant: MORTARA INSTRUMENT, INC.
    Inventors: Brian E. Sueppel, David W. Mortara
  • Patent number: 5704351
    Abstract: A digital telemetry transmitter for transmitting eight channels of diagnostic quality electrocardiographic data has input circuitry for receiving analog EKG signals originating at electrodes on the patient. The input circuitry includes a circuit for ascertaining the impedance of the electrode connection to the patient and to indicate an electrode fault. EKG signals from the input circuit are provided to a digital/analog converter for converting the analog signals into corresponding digital signals. The analog/digital converter may comprise an eight channel, 20-bit converter, sampling the input signals at a frequency of 10 KHz and providing a digital output signal having a frequency of 500 Hz. The output of the analog/digital converter is provided to a microprocessor control which provides a digital EKG modulating output signal. The output signal is periodically inverted to avoid stationarity in the transmitted data.
    Type: Grant
    Filed: February 28, 1995
    Date of Patent: January 6, 1998
    Assignee: Mortara Instrument, Inc.
    Inventors: David W. Mortara, Brian E. Sueppel
  • Patent number: 5546950
    Abstract: An electrocardiographic patient lead cable apparatus comprises an elongated cable part and a connector. The cable part has a plurality of connecting wires with connectors for the electrodes. The connecting wires are joined together for varying portions of their length to form a flat common portion of the cable part. The common portion is connected at one end to the connector. The connecting wires separate from the common portion at the selected locations along the extension of the common part from the end connected to the connector to form relatively short separated connecting wires. The lead cable apparatus so formed facilitates correct connection of electrodes positioned at various locations on the body of the patient and reduces or eliminates tangling of the connecting wires. The connector is of compact, lightweight construction.
    Type: Grant
    Filed: July 6, 1994
    Date of Patent: August 20, 1996
    Assignee: Mortara Instrument, Inc.
    Inventors: Kurt P. Schoeckert, David W. Mortara
  • Patent number: 5490515
    Abstract: An apparatus and method directed to an adaptive noise filtering arrangement. The arrangement has the ability to estimate a first set of data for a first time-dependent variable based upon at least two sets of data for two time-dependent variables related to the first time-dependent variable. Additionally, the arrangement has the ability to filter an actual set of data for the first time-dependent variable based upon the first set of data and the actual set of data. The estimated first set of data and filtered actual set of data can be printed or displayed in a graphical format for analysis.
    Type: Grant
    Filed: August 29, 1994
    Date of Patent: February 13, 1996
    Assignee: Mortara Instrument, Inc.
    Inventor: David W. Mortara