Patents by Inventor Dennis E. Larson

Dennis E. Larson 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).

  • Variable antenna matching network for an implantable antenna
    Patent number: 7409245
    Abstract: An implantable medical device may have an antenna for communication with external devices or other internal devices. Changes in the patient's body position, weight, composition or other factors may change the antenna efficiency and hinder communication. The disclosed circuit may automatically adjust a matching network for an implanted transceiver to dynamically maximize transmission and reception by controlling the selected value of a plurality of capacitors, inductors and resistors.
    Type: Grant
    Filed: January 30, 2007
    Date of Patent: August 5, 2008
    Assignee: Cardiac Pacemakers, Inc.
    Inventors: Dennis E. Larson, Prashant Rawat, Daniel Kollmann
  • VARIABLE ANTENNA MATCHING NETWORK FOR AN IMPLANTABLE ANTENNA
    Publication number: 20080180345
    Abstract: An implantable medical device may have an antenna for communication with external devices or other internal devices. Changes in the patient's body position, weight, composition or other factors may change the antenna efficiency and hinder communication. The disclosed circuit may automatically adjust a matching network for an implanted transceiver to dynamically maximize transmission and reception by controlling the selected value of a plurality of capacitors, inductors and resistors.
    Type: Application
    Filed: January 30, 2007
    Publication date: July 31, 2008
    Inventors: Dennis E. Larson, Prashant Rawat, Daniel Kollmann
  • Minute ventilation sensor with dynamically adjusted excitation current
    Patent number: 7092757
    Abstract: A minute ventilation sensing device in which transthoracic impedance is measured with a excitation current waveform at a specified amplitude and frequency. In order reduce interference with the impedance measurement from external noise sources, a noise detection operation may be performed with the amplitude and/or frequency of the excitation current waveform adjusted accordingly.
    Type: Grant
    Filed: July 12, 2002
    Date of Patent: August 15, 2006
    Assignee: Cardiac Pacemakers, Inc.
    Inventors: Dennis E. Larson, Douglas R. Daum
  • Minute ventilation sensor with automatic high pass filter adjustment
    Patent number: 6868346
    Abstract: A minute ventilation sensing device in which transthoracic impedance is measured to generate an impedance signal from which a ventilation signal is derived, where the ventilation signal is proportional to minute ventilation. An adaptive high pass filter is used to filter the impedance signal into a ventilation band. The pole frequency of the high pass filter is adjusted in accordance with changes in a calculated signal variation parameter.
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: March 15, 2005
    Assignee: Cardiac Pacemakers, Inc.
    Inventors: Dennis E. Larson, Douglas R. Daum
  • MINUTE VENTILATION SENSOR WITH AUTOMATIC HIGH PASS FILTER ADJUSTMENT
    Publication number: 20040102908
    Abstract: A minute ventilation sensing device in which transthoracic impedance is measured to generate an impedance signal from which a ventilation signal is derived, where the ventilation signal is proportional to minute ventilation. An adaptive high pass filter is used to filter the impedance signal into a ventilation band. The pole frequency of the high pass filter is adjusted in accordance with changes in a calculated signal variation parameter.
    Type: Application
    Filed: November 27, 2002
    Publication date: May 27, 2004
    Inventors: Dennis E. Larson, Douglas R. Daum
  • Minute ventilation sensor with dynamically adjusted excitation current
    Publication number: 20040049237
    Abstract: A minute ventilation sensing device in which transthoracic impedance is measured with a excitation current waveform at a specified amplitude and frequency. In order reduce interference with the impedance measurement from external noise sources, a noise detection operation may be performed with the amplitude and/or frequency of the excitation current waveform adjusted accordingly.
    Type: Application
    Filed: July 12, 2002
    Publication date: March 11, 2004
    Inventors: Dennis E. Larson, Douglas R. Daum