Patents by Inventor David J. Yonce

David J. Yonce 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: 20030083584
    Abstract: A “leads-off indicator” for an ECG apparatus for indicating that one or more of a plurality of ECG electrodes is not properly affixed to a patient and that that obviates the need for a conventional high frequency drive signal, but instead, employs common mode input noise as a drive signal to a reference electrode such that if one of the electrodes defining an ECG vector is not properly affixed, an increase in the ambient noise on an ECG vector associated with the detached electrode occurs as a detectable event. A first algorithm is used to identify whether or not the reference electrode itself is properly affixed to the patient's right leg and, if so, the common mode signal presented to the remaining limb electrodes becomes unbalanced should one of the limb electrodes not be properly connected to the patient. An impedance balancing circuit is provided for developing signals allowing identification of a lose electrode when the ECG system does not utilize a right leg electrode as a reference.
    Type: Application
    Filed: December 10, 2002
    Publication date: May 1, 2003
    Applicant: Cardiac Pacemakers, Inc.
    Inventor: David J. Yonce
  • Publication number: 20030083710
    Abstract: An apparatus and method for verifying capture by a pacing pulse in which a test depolarization waveform recorded during a pacing event is compared with a template waveform representing capture by the pacing pulse. Capture verification in this manner may be used in pacemakers having multiple pacing channels for the atrial and/or ventricles where the multiple paces can interfere with conventional sensing of evoked responses in order to verify capture.
    Type: Application
    Filed: October 26, 2001
    Publication date: May 1, 2003
    Inventors: David Ternes, David J. Yonce
  • Publication number: 20030083707
    Abstract: The ability of an ecg apparatus to detect and display pacing pulses from the surface electrodes on a patient in whom a minute ventilation-based rate adaptive pacemaker is implanted is improved by providing the ecg apparatus with a minute ventilation detection circuit capable of indicating the time of occurrence and repetition rate of bursts of AC carrier signals which the implanted pacemaker generates in deriving a minute ventilation related control signal for the implanted pacemaker. In addition to improving the ability of the ecg system to detect and record paced events, the incorporation of the MV detection into the ecg system accommodates leads-off detection by coordinating the generation of the leads-off drive signal with the MV carrier signal generated by the implanted pacer.
    Type: Application
    Filed: October 25, 2001
    Publication date: May 1, 2003
    Applicant: Cardiac Pacemakers, Inc.
    Inventor: David J. Yonce
  • Publication number: 20030073916
    Abstract: A voltage sensing system includes input impedance balancing for electrocardiogram (ECG) sensing or other applications, providing immunity to common-mode noise signals while capable of use with two electrodes. Signals are received at first and second electrodes having associated impedances. An impedance circuit includes a feedback controller that adjusts an effective impedance associated with the second electrode based on a difference signal, a common mode signal, a phase-shifted (e.g., quadrature common mode) signal, and an impedance associated with the first electrode. As a result, signals associated with each electrode undergo a similar degree of gain/attenuation and/or phase-shift. This reduces common mode noise and enhances the signal-to-noise characteristics of a desired ECG or other output signal, without requiring the use of more than two electrodes.
    Type: Application
    Filed: December 17, 2002
    Publication date: April 17, 2003
    Applicant: Cardiac Pacemakers, Inc.
    Inventor: David J. Yonce
  • Publication number: 20030055349
    Abstract: To enhance the ability to visualize P-waves in surface ECG data, an algorithm is presented in which the ECG data is selectively passed through first and second signal processing channels where one of the channels includes signal processing elements for enhancing P-waves and the other channel provides a delayed version of the original data. Upon detection of an atrial pace event, the filtered or filtered and amplified data is inserted into the data stream in place of the raw input signal for a predetermined time interval sufficiently long to ensure the occurrence of an atrial depolarization signal.
    Type: Application
    Filed: September 20, 2001
    Publication date: March 20, 2003
    Applicant: Cardiac Pacemakers, Inc.
    Inventor: David J. Yonce
  • Publication number: 20030023176
    Abstract: A system and method for detecting pacing pulses generated by a cardiac pacemaker within an ECG signal. The method involves decomposing the ECG signal into high and low-frequency components that represent the energy of the input signal in high and low-frequency bands. The timing of energy pulses detected within the high and low-frequency bands are then used to determine whether the pulses may represent a pacing pulse.
    Type: Application
    Filed: September 19, 2002
    Publication date: January 30, 2003
    Applicant: Cardiac Pacemakers, Inc.
    Inventors: David J. Yonce, Peter John Ormsby
  • Patent number: 6496721
    Abstract: A voltage sensing system includes input impedance balancing for electrocardiogram (ECG) sensing or other applications, providing immunity to common-mode noise signals while capable of use with two electrodes. Signals are received at first and second electrodes having associated impedances. An impedance circuit includes a feedback controller that adjusts an effective impedance associated with the second electrode based on a difference signal, a common mode signal, a phase-shifted (e.g., quadrature common mode) signal, and an impedance associated with the first electrode. As a result, signals associated with each electrode undergo a similar degree of gain/attenuation and/or phase-shift. This reduces common mode noise and enhances the signal-to-noise characteristics of a desired ECG or other output signal, without requiring the use of more than two electrodes.
    Type: Grant
    Filed: April 28, 2000
    Date of Patent: December 17, 2002
    Assignee: Cardiac Pacemakers, Inc.
    Inventor: David J. Yonce
  • Publication number: 20020183635
    Abstract: A voltage sensing system includes input impedance balancing for electrocardiogram (ECG) sensing or other applications, providing immunity to common-mode noise signals while capable of use with two electrodes. Signals are received at first and second electrodes having associated impedances. An impedance circuit includes a feedback controller that adjusts an effective impedance associated with the second electrode based on a difference signal, a common mode signal, a phase-shifted (e.g., quadrature common mode) signal, and an impedance associated with the first electrode. As a result, signals associated with each electrode undergo a similar degree of gain/attenuation and/or phase-shift. This reduces common mode noise and enhances the signal-to-noise characteristics of a desired ECG or other output signal, without requiring the use of more than two electrodes.
    Type: Application
    Filed: July 18, 2002
    Publication date: December 5, 2002
    Applicant: Cardiac Pacemakers, Inc.
    Inventor: David J. Yonce
  • Patent number: 6477404
    Abstract: A system and method for detecting pacing pulses generated by a cardiac pacemaker within an ECG signal. The method involves decomposing the ECG signal into high and low-frequency components that represent the energy of the input signal in high and low-frequency bands. The timing of energy pulses detected within the high and low-frequency bands are then used to determine whether the pulses may represent a pacing pulse.
    Type: Grant
    Filed: March 1, 2000
    Date of Patent: November 5, 2002
    Assignee: Cardiac Pacemakers, Inc.
    Inventors: David J. Yonce, Peter John Ormsby
  • Patent number: 6438406
    Abstract: A voltage sensing system includes input impedance balancing for electrocardiogram (ECG) sensing or other applications, providing immunity to common-mode noise signals while capable of use with two electrodes. Signals are received at first and second electrodes having associated impedances. An impedance circuit includes a feedback controller that adjusts an effective impedance associated with the second electrode based on a difference signal, a common mode signal, a phase-shifted (e.g., quadrature common mode) signal, and an impedance associated with the first electrode. As a result, signals associated with each electrode undergo a similar degree of gain/attenuation and/or phase-shift. This reduces common mode noise and enhances the signal-to-noise characteristics of a desired ECG or other output signal, without requiring the use of more than two electrodes.
    Type: Grant
    Filed: January 18, 2001
    Date of Patent: August 20, 2002
    Assignee: Cardiac Pacemakers, Inc.
    Inventor: David J. Yonce
  • Patent number: 6407931
    Abstract: A DC to DC converter having a flange attached to the housing. The flange configured to electrically isolate, insulate and shield the DC to DC converter from an underlying circuit board. The flange may be further configured to meet creepage distances and air clearances required by various regulatory and certification agencies.
    Type: Grant
    Filed: July 11, 2000
    Date of Patent: June 18, 2002
    Assignee: Cardiac Pacemakers, Inc.
    Inventors: David J. Yonce, Scott T. Mazar, Scott R. Vanderlinde
  • Publication number: 20010021813
    Abstract: A voltage sensing system includes input impedance balancing for electrocardiogram (ECG) sensing or other applications, providing immunity to common-mode noise signals while capable of use with two electrodes. Signals are received at first and second electrodes having associated impedances. An impedance circuit includes a feedback controller that adjusts an effective impedance associated with the second electrode based on a difference signal, a common mode signal, a phase-shifted (e.g., quadrature common mode) signal, and an impedance associated with the first electrode. As a result, signals associated with each electrode undergo a similar degree of gain/attenuation and/or phase-shift. This reduces common mode noise and enhances the signal-to-noise characteristics of a desired ECG or other output signal, without requiring the use of more than two electrodes.
    Type: Application
    Filed: January 18, 2001
    Publication date: September 13, 2001
    Applicant: Cardiac Pacemakers, Inc.
    Inventor: David J. Yonce
  • Patent number: 6208888
    Abstract: A voltage sensing system includes input impedance balancing for electrocardiogram (ECG) sensing or other applications, providing immunity to common-mode noise signals while capable of use with two electrodes. Signals are received at first and second electrodes having associated impedances. An impedance circuit includes a feedback controller that adjusts an effective impedance associated with the second electrode based on a difference signal, a common mode signal, a phase-shifted (e.g., quadrature common mode) signal, and an impedance associated with the first electrode. As a result, signals associated with each electrode undergo a similar degree of gain/attenuation and/or phase-shift. This reduces common mode noise and enhances the signal-to-noise characteristics of a desired ECG or other output signal, without requiring the use of more than two electrodes.
    Type: Grant
    Filed: February 3, 1999
    Date of Patent: March 27, 2001
    Assignee: Cardiac Pacemakers, Inc.
    Inventor: David J. Yonce
  • Patent number: 5461322
    Abstract: A feedback operated DC bridge circuit for monitoring the voltage variations in a voltage divider circuit using a voltage controlled resistance component to reach a null balance across the bridge. Amplification is provided at higher accuracy near the null point when the voltage difference across the bridge is zero. The feedback bridge circuit includes an integrator which directly drives the controlling component to the value of the resistance in an unknown branch to force the null condition. The voltage controlled component (configured as a discrete metal oxide semiconductor device or bipolar junction transistor) and the balancing scheme are suitable for microfabrication and provides noise-rejection enhancement. The interconnected integral feedback of the autonulling DC bridge enables both a neural network for pre-processing sensor input in a spatial domain as well as general analog computation that mimics a first order differential equation in the form of the system state equation.
    Type: Grant
    Filed: August 6, 1993
    Date of Patent: October 24, 1995
    Assignees: Geo-Centers, Inc., Naval Research Laboratory
    Inventors: Paul P. Bey, Jr., Thomas L. Fare, David J. Yonce