Patents by Inventor David Ritscher

David Ritscher 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: 20060247547
    Abstract: A method and apparatus for detecting atrial arrhythmias and discriminating atrial fibrillation (AF) and organized atrial tachycardia (OAT) that includes defining a threshold detection criteria for a cluster signature evidence metric corresponding to a Lorenz distribution of ventricular cycle lengths representative of AF or OAT. Using a signal containing VCL information, a number of consecutive ventricular cycle lengths are determined during a selected time interval for generating a one-dimensional or a two-dimensional histogram as a numerical representation of a Lorenz plot of VCLs. A number of cluster signature metrics are computed using the stored ventricular cycle length information, and a cluster signature evidence metric is computed from the cluster signature metrics. AF or OAT is detected if a comparative analysis of a corresponding cluster signature evidence metric meets a respective threshold detection criteria.
    Type: Application
    Filed: December 29, 2005
    Publication date: November 2, 2006
    Inventors: Shantanu Sarkar, David Ritscher
  • Publication number: 20060247548
    Abstract: A multi-layer method for detecting atrial arrhythmias using ventricular cycle length information that includes performing a base layer algorithm for detecting the onset and offset of an atrial tachyarrhythmia. The multi-layer method further includes one or more higher layer algorithms executed in response to a base layer detection to confirm or reject the base layer detection. The base layer is designed to operate with high sensitivity to atrial fibrillation and/or organized atrial tachycardia and the higher layer is designed to operate with high sensitivity and high specificity to atrial fibrillation and/or organized atrial tachycardia.
    Type: Application
    Filed: December 29, 2005
    Publication date: November 2, 2006
    Inventors: Shantanu Sarkar, David Ritscher
  • Publication number: 20050159783
    Abstract: Control of defibrillation therapy delivered by implantable medical devices (IMDS) using hemodynamic sensor feedback is disclosed. The hemodynamic sensor feedback allows for increased control over application of atrial defibrillation therapy. Specifically, the therapy is delivered when a fibrillation episode results in a discrete loss of hemodynamic function. Defibrillation therapy is thus withheld for hemodynamically benign arrhythmias.
    Type: Application
    Filed: January 16, 2004
    Publication date: July 21, 2005
    Inventors: Douglas Hettrick, David Euler, Eduardo Warman, Michael Ujhelyi, Rahul Mehra, Paul Ziegler, Shailesh Kumar Musley, Charles Distad, David Ritscher
  • Patent number: 6876880
    Abstract: The invention relates to the use of atrial pacing therapies to treat atrial tachycardia (AT). When an AT episode is detected, an implantable medical device applies an ATP therapy. If the AT episode persists, the ATP therapy may be automatically reapplied at a later time during the course of the same AT episode. In particular, previously used ATP therapies are reapplied when episodic conditions, such as cycle length or cycle regularity, change. Although a particular ATP therapy initially may be unsuccessful in terminating the AT, it may prove successful when the cycle length or regularity of the atrial rhythm changes. As the rhythm slows down, the AT may be more responsive to ATP therapies that were previously unsuccessful. As a result, potentially efficacious ATP therapies can be reapplied to terminate AT episodes, and reduce the number of episodes that require more aggressive termination by painful, atrial shocks.
    Type: Grant
    Filed: December 20, 2001
    Date of Patent: April 5, 2005
    Assignee: Medtronic, Inc.
    Inventors: Michael F. Hess, Rahul Mehra, Eduardo N. Warman, Nirav V. Sheth, Mark L. Brown, David Ritscher