Patents by Inventor Richard J. Wessels

Richard J. Wessels 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).

  • Low-energy atrial cardioversion therapy with controllable pulse-shaped waveforms
    Patent number: 8473051
    Abstract: An implantable therapy generator that includes sensing circuitry that senses cardiac signals representative of atrial activity and ventricular activity; detection circuitry connected to the sensing circuitry; control circuitry that controls generation and selective delivery of a multi-stage atrial cardioversion therapy to implanted electrodes, each stage of the therapy including multiple pulses, each pulse including multiple high-frequency sub-pulses; and therapy circuitry.
    Type: Grant
    Filed: December 29, 2011
    Date of Patent: June 25, 2013
    Assignee: Cardialen, Inc.
    Inventors: Richard J. Wessels, Igor R. Efimov, Wenwen Li
  • Power management system for an implantable device
    Patent number: 5869970
    Abstract: A power management system for an implantable device is disclosed. One application is an implantable cardioverter/defibrillator. Charging circuits for implantable cardioverter/defibrillators require relatively large currents from the power supply. The present power management system provides extended device operation and reduced charge cycle time. The present system monitors both current and voltage drawn from the power supply to prevent a loss of system voltage. Elective replacement indication is performed using charging information provided by the present power management system.
    Type: Grant
    Filed: October 31, 1995
    Date of Patent: February 9, 1999
    Assignee: Cardiac Pacemakers, Inc.
    Inventors: William A. Palm, Lloyd A. Van Hofwegen, Jean-Cheui Hsung, Michael W. Dooley, Keith R. Maile, William J. Linder, David W. Kelly, Jeffrey Laackmann, Richard J. Wessels