Patents by Inventor Fred A. Lenz

Fred A. Lenz 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).

  • Quantification of muscle tone
    Patent number: 6589190
    Abstract: A method and device for the quantification of muscle tone, particularly the wrist, wherein non-sinusoidal and non ramp trajectories are used to drive the wrist. Equation 1 is utilized determine the stiffness, viscosity and inertial parameters. &tgr;s(t)=KH&thgr;(t)+BH&thgr;(t)+JT&thgr;(t)+&tgr;off  [Eq. 1] wherein where &tgr;s is the total torque, &tgr;off is the offset torque, KH and BH are the angular stiffness and viscosity of the combined flexor and extensor muscle groups that act on the joint, JT is the combined inertia of the oscillating appendage, &thgr; is the angular displacement of the system, and θ . ⁢   ⁢ and ⁢   ⁢ θ ¨ are the velocity and acceleration.
    Type: Grant
    Filed: September 6, 2001
    Date of Patent: July 8, 2003
    Assignee: The John Hopkins University
    Inventors: Sami S. Kanderian, Jr., Randal P. Goldberg, Katrina Rieflin Ubell, Barbara J. De Lateur, Louis L. Whitcomb, Fred A. Lenz
  • Quantification of muscle tone
    Publication number: 20020156399
    Abstract: A method and device for the quantification of muscle tone, particularly the wrist, wherein non-sinusoidal and non ramp trajectories are used to drive the wrist. Equation 1 is utilized determine the stiffness, viscosity and inertial parameters.
    Type: Application
    Filed: September 6, 2001
    Publication date: October 24, 2002
    Inventors: Sami S. Kanderian, Randal P. Goldberg, Katrina Rieflin Obell, Barbara J. de Lateur, Louis L. Whitcomb, Fred A. Lenz