Patents by Inventor Harold K. Dunn

Harold K. Dunn 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: 4959066
    Abstract: An osteotomy guide assembly for femoral neck osteotomy includes a saddle locator assembly and a saw guide attachment. The saddle locator assembly includes a barrel-shaped locating device that locates the saddle region of the proximal femur. The barrel further includes a transverse support bar extending from the barrel. The barrel is positioned over an intramedullary shaft which is temporarily positioned in and extends from the medullary canal of the femur. A saw guide is used in conjunction with the saddle locator assembly. The saw guide is attached to the support bar by a single locking means which provides for positional adjustment of the saw guide relative to the support bar in two directions, including adjustment in the anterior-posterior direction along the transverse support bar and axially along the femur via a post which extends from the saw guide.
    Type: Grant
    Filed: February 24, 1989
    Date of Patent: September 25, 1990
    Assignee: Zimmer, Inc.
    Inventors: Harold K. Dunn, Mark A. Lazzeri, Jeffrey M. Ondrla
  • Patent number: 4922898
    Abstract: The present invention is in an apparatus and surgical procedure for fitting a hip prosthetic implant to a distal femur in a surgical procedure, replacing the femur neck and ball end. The present process is for testing to verify that a distal femur intramedullary channel is properly prepared to receive, in friction fitting engagement, the prosthetic implant. Which process is practiced utilizing an adapter that is for coupling to a square drive of a torque wrench. In checking for proper intramedullary channel preparation a torsional force is transmitted through the adapter to a rasp seating in the channel, which rasp is used to prepare that intramedullary channel, the torsional force application, to verify proper intramedullary channel preparation, which torque wrench through adapter is also to apply a torsional force to a prosthetic implant seated in that prepared intramedullary channel to verify a proper friction fit thereof.
    Type: Grant
    Filed: October 4, 1988
    Date of Patent: May 8, 1990
    Inventor: Harold K. Dunn
  • Patent number: 4759350
    Abstract: The present invention provides a system of instruments for shaping the distal femur and proximal tibia surfaces to receive components of a knee prosthesis for knee replacement surgery. The system references the femur intramedullary channel with a femoral alignment guide to prepare the distal femur that, in turn, is a reference for several cutting guides for sequential attachment to the femoral alignment guide and prepared bone surfaces whereby the prepared distal femur is prepared to a flat surface that is perpendicular to the patient's mechanical axis with bone surfaces adjacent thereto sectioned to surfaces that are at right angles to that distal femur surface with chamfers therebetween to receive the femur component of a knee prosthesis.
    Type: Grant
    Filed: October 17, 1986
    Date of Patent: July 26, 1988
    Inventors: Harold K. Dunn, Kim C. Bertin
  • Patent number: 4289123
    Abstract: The present invention in an improved orthopedic appliance is for attachment in supporting engagement to a patient's spine, during an anterior surgical procedure thereof. The installed appliance provides for decompression of the contents of the spinal canal and/or is to obtain sufficient fusion mass to provide long-term spinal stability. The appliance incorporates a pair of contoured rocker arm brackets that are each attached to a separated vertebral portions of healthy vertebra, with a damaged or diseased vertebra therebetween. Spacing adjustment and columnar support between the brackets is provided by a single spacing adjustment rod whose ends are threaded oppositely and are turned into appropriately threaded portions of the brackets. A second slide rod is preferably provided that also extends between the brackets and is arranged to slide freely therein but preferably is arranged to accommodate nuts, or the like, turned thereon against the brackets to provide columnar support thereacross.
    Type: Grant
    Filed: March 31, 1980
    Date of Patent: September 15, 1981
    Inventor: Harold K. Dunn