Patents by Inventor Ludwig Zichner

Ludwig Zichner 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: 5425778
    Abstract: The actabular socket supporting ring has a modular construction and is formed of a supporting ring having two securing straps for a cement-free attachment in and on the corresponding bone portions, of a socket cup which is pivotably adjustable in the supporting ring and attachable to the supporting ring by a securing element without the use of bone cement, and of an insert receiving the joint head. The modular construction, and in particular, the pivotable arrangement of the socket cup in the supporting ring, allows a biomechanically optimal alignment of the socket cup, and thus, of the insert receiving the joint ball, and the securing of the socket cup to the supporting ring by a securing element allows an entirely cement-free anchorage of all components.
    Type: Grant
    Filed: October 7, 1993
    Date of Patent: June 20, 1995
    Assignee: Oscobal AG
    Inventors: Ludwig Zichner, Thomas Wahl, Beat Leu
  • Patent number: 4662889
    Abstract: A knee joint prosthesis includes a C-shaped femur cap to be fitted onto a resected femur condyle. The C-shaped femur cap is made up of two arch-shaped parts spaced apart and connected by a relatively flat third part. Each of the arch-shaped parts has a different radius. The arch-shaped part with the larger radius has an oblong hole extending in the circumferential direction of the part. A shaft can be placed through the oblong hole from the femur into the tibia. In addition, a tibia cap can be fitted onto the plateau of the tibia.
    Type: Grant
    Filed: April 26, 1984
    Date of Patent: May 5, 1987
    Assignee: Feldmuhle Aktiengesellschaft
    Inventors: Ludwig Zichner, Erhard Dorre, Peter Prussner, Horst von Borries
  • Patent number: 4538306
    Abstract: An implantable elbow joint for connecting the upper arm and the forearm includes an axially extending sleeve of C-shape transverse cross-section, a cylindrical member engageable within the sleeve, and a connecting member implantable in the ulna and engageable with the cylindrical member in the sleeve. The sleeve embraces the trochlea of the humerus through an angle of more than about the sleeve axis and also serves as the abutment for supporting the radius. The sleeve has a slot extending in the radial and the circumferential directions. At least in the region of the slot, the internal surface of the sleeve is formed by a cylindrically shaped surface. A cylindrically shaped sliding member is supported in the sleeve in the region of the slot. An elongated shaft is arranged to be inserted into the ulna with one end projecting out of the ulna and extending through the slot into the sliding member.
    Type: Grant
    Filed: June 22, 1983
    Date of Patent: September 3, 1985
    Assignee: Feldmuhle Aktiengesellschaft
    Inventors: Erhard Dorre, Peter Prussner, Ludwig Zichner
  • Patent number: 4312079
    Abstract: A femur head cap for endoprosthesis possessing a spherical shape and having a recess for partially receiving the femur head, the recess being open toward the neck of the femur. The cap is advantageous in that it can be firmly anchored to avoid rotation and tilting without the use of bone cement and further allows for simple resection to be performed so that supply of blood to the bone is not impaired.
    Type: Grant
    Filed: March 31, 1980
    Date of Patent: January 26, 1982
    Assignee: Feldmuhle Aktiengesellschaft
    Inventors: Erhard Dorre, Peter Prussner, Ludwig Zichner