Patents by Inventor John A. Cristion

John A. Cristion 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).

  • Patent number: 7869863
    Abstract: The present invention provides a method and apparatus for monitoring the fetal condition in an objective, quantitative, and non-invasive manner by enabling continuous and highly specific data collection during pre-natal development and the intra-partum period. In an embodiment, monitoring the fetal condition comprises monitoring a fetal heart rate, a fetal heart rate variability, and/or the fetal heart vector orientation of a fetus in a pregnant mother. Automated signal processing techniques are applied to a multiplicity of transducers to select an optimum signal vector to monitor at least one of a fetal heart rate, a fetal heart rate variability, and/or the fetal heart vector orientation of a fetus in a pregnant mother.
    Type: Grant
    Filed: January 10, 2008
    Date of Patent: January 11, 2011
    Assignee: The Johns Hopkins University
    Inventors: Edward J. Moses, John A. Cristion, Susanne M. Daniels, Wayne I. Sternberger, Timothy P. Magnani
  • Publication number: 20090182242
    Abstract: The present invention provides a method and apparatus for monitoring the fetal condition in an objective, quantitative, and non-invasive manner by enabling continuous and highly specific data collection during pre-natal development and the intra-partum period. In an embodiment, monitoring the fetal condition comprises monitoring a fetal heart rate, a fetal heart rate variability, and/or the fetal heart vector orientation of a fetus in a pregnant mother. Automated signal processing techniques are applied to a multiplicity of transducers to select an optimum signal vector to monitor at least one of a fetal heart rate, a fetal heart rate variability, and/or the fetal heart vector orientation of a fetus in a pregnant mother.
    Type: Application
    Filed: January 10, 2008
    Publication date: July 16, 2009
    Inventors: Edward J. Moses, John A. Cristion, Susanne M. Daniels, Wayne I. Sternberger, Timothy P. Magnani
  • Patent number: 5513098
    Abstract: A method of developing a controller for general (nonlinear) discrete-time systems, where the equations governing the system are unknown and where a controller is estimated without building or assuming a model for the system. The controller is constructed through the use of a function approximator (FA) such as a neural network or polynomial. This involves the estimation of the unknown parameters within the FA through the use of a stochastic approximation that is based on a simultaneous perturbation gradient approximation, which requires only system measurements (not a system model).
    Type: Grant
    Filed: December 27, 1994
    Date of Patent: April 30, 1996
    Assignee: The Johns Hopkins University
    Inventors: James C. Spall, John A. Cristion
  • Patent number: 5311876
    Abstract: A patient monitoring system and a method of operating same, including automatically detecting a seizure in the patient, by detecting an electrical discharge in the patient's brain; converting the detected electrical discharge into a digital signal; inputting the digital signal into a microprocessor; detecting a seizure by dividing the digital signals into time segments, preprocessing each time segment including standardizing the signal, reducing the signal in each time segment to a feature, the feature providing information about whether a seizure is occurring using the feature from each time segment; and indicating that a seizure is occurring.
    Type: Grant
    Filed: November 18, 1992
    Date of Patent: May 17, 1994
    Assignee: The Johns Hopkins University
    Inventors: Dale E. Olsen, Ronald P. Lesser, John C. Harris, W. Robert S. Webber, John A. Cristion