Patents by Inventor C. M. Jayashankar

C. M. Jayashankar 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).

  • Acetabular trial
    Patent number: 5879401
    Abstract: An acetabular trial insert is provided in which the appropriate anteversion angle of the acetabular cup of a hip prosthesis may be determined automatically by placing an inner cup within an outer cup and providing a mechanism which will hold the inner cup in position after the trial has been reduced and the hip rotated through an intended range of motion.
    Type: Grant
    Filed: May 17, 1996
    Date of Patent: March 9, 1999
    Assignee: Johnson & Johnson Professional, Inc.
    Inventors: John W. Besemer, Salvatore Caldarise, Frank R. Foley, Allan Ritchie, C. M. Jayashankar, Anthony Sanders
  • Femoral stem with reduced coefficient of friction with respect to bone cement
    Patent number: 5871549
    Abstract: An orthopedic device is provided having a femoral stem with a proximal end, a distal end, and an intermediate portion extending between the proximal end and the distal end. The intermediate portion tapers from a first cross-sectional geometry near the proximal end to a second cross-sectional geometry near the distal end. A surface region of the femoral stem has a coefficient of friction less than 0.3 with respect to a bone cement. The surface region can include a treated metal region integral with the stem, or a friction reducing coating or sheath that coats or covers a portion of the stem. A collar can be provided near the proximal end of the stem that has a greater diameter than the first diameter of the stem.
    Type: Grant
    Filed: December 12, 1996
    Date of Patent: February 16, 1999
    Assignee: Johnson & Johnson Professional, Inc.
    Inventors: C. M. Jayashankar, Frank D. Matthews, III, Jorge A. Ochoa