Patents Assigned to Exactech, Inc.
  • Patent number: 5846244
    Abstract: A counter-balanced oscillating surgical saw for use in surgical procedures is described which greatly reduces the vibrations caused when the saw blades contact the patient's anatomy. The reduction of vibration is achieved by the present saw which uses two oscillating blades to counter the kinetic energy typically lost when only one blade is used. The preferred embodiment of the present invention includes at least two cutting blades mounted on at least two actuator blocks. The actuator blocks are preferably mounted on at least two shafts which extend from the top of the saw handle: a pivot shaft and a rotatable shaft which is rotated by an electric motor. At least two eccentric bearings are mounted to the rotatable shaft (one bearing for each actuator block) such that the bearings orbit about the rotatable shaft 180.degree. out-of-phase with respect to one another.
    Type: Grant
    Filed: September 5, 1997
    Date of Patent: December 8, 1998
    Assignee: Exactech, Inc.
    Inventor: Phil Cripe
  • Patent number: 5725580
    Abstract: An apparatus and method of use directed towards protective and supportive hole caps for prosthetic implant devices are disclosed. The present hole cap supports a prosthesis and provides a physical barrier between the prosthesis and underlying bone matter. In a preferred embodiment, the hole cap includes at least one compression spring formed along the perimeter of the cap. The compression spring maintains the hole cap within a counter-bored hole after the hole cap is inserted within the counter-bored hole. In accordance with the present invention, the compression spring deflects slightly towards the center of the hole cap when the cap is inserted within the counter-bored hole. The compression spring provides sufficient compression force against the sidewalls of the counter-bored hole to thereby hold the hole cap in place within the hole. The counter-bored hole is preferably shaped to snugly receive the outer perimeter of the hole cap.
    Type: Grant
    Filed: July 11, 1996
    Date of Patent: March 10, 1998
    Assignee: Exactech, Inc.
    Inventors: Raymond J. Cloutier, Cary M. Mauldin
  • Patent number: 5688281
    Abstract: An intramedullary alignment guide and method for use thereof are disclosed for accurately preparing and shaping the distal femur end surface to receive a knee prosthesis for securement thereto. The guide references the femur intramedullary canal to ensure that a distal femoral resector is properly positioned at a selected angle with respect to a patient's mechanical axis. In the preferred embodiment, the intramedullary alignment guide includes an opening for inserting an intramedullary rod therethrough and into the intramedullary canal of a patient. The present guide includes an adjustment mechanism which allows a surgeon to quickly and easily deflect an attached distal femoral resector into a desired angular displacement with respect to intramedullary canal. In accordance with the preferred method, the distal femoral resector angled with respect to the intramedullary canal so that a cut can be made in a patient's distal femur end which is perpendicular with the patient's mechanical axis.
    Type: Grant
    Filed: October 9, 1996
    Date of Patent: November 18, 1997
    Assignee: Exactech, Inc.
    Inventors: Phil Cripe, Cary M. Mauldin
  • Patent number: 5263988
    Abstract: A bipolar endoprosthesis assembly which provides for a wide-range of motion between a bone and a socket (e.g., a femur and an acetabular socket), comprising a metal outer shell element, a ultra-high molecular weight, low-friction insert formed to fit within the shell element, and a locking ring designed to lock the assembly together with a femoral head prosthesis. The outer shell has a generally spherical shape on its outer surface to be received by a human socket such as the acetabulum. The inner surface of the outer shell is faceted to inhibit rotation of a correspondingly shaped inner insert. The insert has an outside surface shaped to mate with the inside surface of the outer shell element. The locking ring is slotted to facilitate insertion of a femoral head prosthesis. The locking ring also has dual sets of locking barbs shaped to mate with recesses on the inner surface of the outer shell element.
    Type: Grant
    Filed: December 29, 1992
    Date of Patent: November 23, 1993
    Assignee: Exactech, Inc.
    Inventor: Randall Huebner
  • Patent number: 5190549
    Abstract: A locking surgical tool handle system. The invention includes a surgical tool handle that has an elongated body portion with a pistol-type grip. The front end of the handle body has a tool retaining structure comprising a contoured engagement face and a movable tension bar with an engagement end. Projections on the engagement end of the tension bar fit within a receiving channel of a surgical tool, such as a broach or rasp. A locking mechanism is provided within the handle body, and is implemented with pivotable links attached to the tension bar. The locking mechanism has an unlocked position in which the engagement end of the tension bar is spaced away from the engagement face of the handle body, and an over-center locked position in which the engagement end of the tension bar is retracted toward the handle body. When the tool handle is placed in its locked position, the engagement end of the tension bar pulls an attached tool into tight contact with the engagement face of the handle body.
    Type: Grant
    Filed: August 2, 1990
    Date of Patent: March 2, 1993
    Assignee: Exactech, Inc.
    Inventors: Gary J. Miller, Matthew Lyons
  • Patent number: 5190550
    Abstract: A locking surgical tool handle system. The invention includes a surgical tool handle that has an elongated body portion with a pistol-type grip. The front end of the handle body has a tool retaining structure comprising a contoured engagement face and a moveable tension bar with an engagement end. Projections on the engagement end of the tension bar fit within a receiving channel of a surgical tool, such as a broach or rasp. A locking mechanism is provided within the handle body, and is implemented with pivotable links attached to the tension bar. The locking mechanism has an unlocked position in which the engagement end of the tension bar is spaced away from the engagement face of the handle body, and an over-center locked position in which the engagement end of the tension bar is retracted toward the handle body. When the tool handle is placed in its locked position, the engagement end of the tension bar pulls an attached tool into tight contact with the engagement face of the handle body.
    Type: Grant
    Filed: May 12, 1992
    Date of Patent: March 2, 1993
    Assignee: Exactech, Inc.
    Inventors: Gary J. Miller, Matthew Lyons
  • Patent number: 5152799
    Abstract: A femoral stem prosthesis including a stem tapering from a proximal end to a distal end, and having a primary zone of taper and a secondary zone of taper. The secondary zone of taper, located at the distal end of the stem, has a larger angle of taper than that of the primary zone of taper, but substantially less than the taper in prior art stems. In the secondary zone of taper, the stem gradually tapers away from the femoral bone to avoid a sudden change in stress level in the bone at the distal stem tip, thus avoiding the incidence of thigh pain. The stem of the inventive prosthesis preferably includes longitudinal channels to increase its flexibility and preferably has a trapezoidal cross-sectional geometry to resist rotational forces and to provide multi-plane stability within the femur, thereby providing effective stress transfer to the femur.
    Type: Grant
    Filed: October 4, 1991
    Date of Patent: October 6, 1992
    Assignee: Exactech, Inc.
    Inventor: Matthew Lyons