Patents by Inventor Andy Wonyong Choi

Andy Wonyong Choi 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: 7981161
    Abstract: The system to implant a prosthetic device in a long bone such as a femur or a humerus includes a stem implant having a recess. The system of present invention also includes a broach to prepare the long bone that may receive the stem implant. The broach also has a recess that is similar to the recess in the stem implant. An adapter of a generally rectangular shape similar to the recess fits snugly in the recess in the stem implant. A trial neck that fits snugly in the recess formed in the adapter is also provided. A trial head may be assembled on the trial neck. A neck similar to the trial neck can be inserted in place of trial neck. A head may be assembled on the proximal end of the neck. A system for implantation of a prosthetic device in a long bone may be made available as a kit that includes at least two stems having the adapter inserted in each of the stem, at least two trial necks, at least two trial heads, at least two necks and at least two heads.
    Type: Grant
    Filed: August 17, 2007
    Date of Patent: July 19, 2011
    Assignee: Howmedica Osteonics Corp.
    Inventors: Andy Wonyong Choi, Philip Bryan, Michael Bausch, Scott Kennard
  • Patent number: 7849766
    Abstract: A screwdriver is disclosed including a handle, a shaft, and a gearbox disposed between the handle and the shaft. The gearbox is structured and arranged to cause rotational motion of the shaft at a first rate due to rotational motion imparted on the handle at a second rate. In an embodiment, the first rate is greater than the second rate.
    Type: Grant
    Filed: May 14, 2008
    Date of Patent: December 14, 2010
    Assignee: Stryker Spine
    Inventors: Amir Ali Sharifi-Mehr, Andy Wonyong Choi, Steven Krause
  • Publication number: 20090048682
    Abstract: The system to implant a prosthetic device in a long bone such as a femur or a humerus includes a stem implant having a recess. The system of present invention also includes a broach to prepare the long bone that may receive the stem implant. The broach also has a recess that is similar to the recess in the stem implant. An adapter of a generally rectangular shape similar to the recess fits snugly in the recess in the stem implant. A trial neck that fits snugly in the recess formed in the adapter is also provided. A trial head may be assembled on the trial neck. A neck similar to the trial neck can be inserted in place of trial neck. A head may be assembled on the proximal end of the neck. A system for implantation of a prosthetic device in a long bone may be made available as a kit that includes at least two stems having the adapter inserted in each of the stem, at least two trial necks, at least two trial heads, at least two necks and at least two heads.
    Type: Application
    Filed: August 17, 2007
    Publication date: February 19, 2009
    Applicant: Howmedica Osteonics Corp.
    Inventors: Andy Wonyong Choi, Philip Bryan, Michael Bausch, Scott Kennard
  • Publication number: 20080294206
    Abstract: An instrument for spinal rotation that aligns and holds direct vertebral rotation (DVR) lever arms relative to each other to achieve an initial axial alignment of a segment of vertebrae and allows the final DVR rotation by rotating the instrument and lever arms together. A method of direct vertebral rotation that allows rotating the vertebrae to be aligned relative to each other, and collectively rotating the vertebrae to be aligned relative to adjacent spinal segments by rotating the direct vertebral rotation instrument. A system for direct vertebral rotation having at least two pedicle screws. The system also includes at least two levers attachable to the pedicle screws and a clamping instrument configured to clamp the levers.
    Type: Application
    Filed: May 16, 2008
    Publication date: November 27, 2008
    Applicant: Stryker Spine
    Inventors: Andy Wonyong Choi, Michael L. Schmitz, Se-Il Suk
  • Publication number: 20080282846
    Abstract: A screwdriver is disclosed including a handle, a shaft, and a gearbox disposed between the handle and the shaft. The gearbox is structured and arranged to cause rotational motion of the shaft at a first rate due to rotational motion imparted on the handle at a second rate. In an embodiment, the first rate is greater than the second rate.
    Type: Application
    Filed: May 14, 2008
    Publication date: November 20, 2008
    Applicant: Stryker Spine
    Inventors: Amir Ali Sharifi-Mehr, Andy Wonyong Choi, Steven Krause
  • Publication number: 20080221583
    Abstract: A polyaxial screwdriver for inserting a bone screw in a vertebra. A polyaxial bone screw assembly includes a coupling element. When a screw engaging end of the polyaxial screwdriver is lowered on the head of the bone screw, the complimentary surfaces of the screw engaging end of the screwdriver and the head of the screw self-align. A ratchet mechanism formed in the screwdriver provides progressive and automatic locking of the polyaxial screwdriver to the coupling element and prevents the accidental unthreading from the coupling element. In another embodiment of the polyaxial screwdriver, a collet slides over the outside surface of the upper end of the coupling element and locks on to the coupling element. In yet another embodiment of a polyaxial screwdriver, the outer sleeve of the polyaxial screwdriver has a split end that securely engages the coupling element.
    Type: Application
    Filed: January 15, 2008
    Publication date: September 11, 2008
    Inventors: Amir Ali Sharifi-Mehr, Ernie Corrao, Andy Wonyong Choi