Patents by Inventor Douglas W. Kohrs

Douglas W. Kohrs 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: 7722621
    Abstract: Spinal fusion implants are laparoscopically placed in a disc space separating two vertebrae. Implant tools, including distraction spacers, boring tools and implants, are passed through a cannula toward the disk space.
    Type: Grant
    Filed: July 19, 2006
    Date of Patent: May 25, 2010
    Assignee: Zimmer Spine, Inc.
    Inventors: Stephen D. Kuslich, Douglas W. Kohrs
  • Patent number: 7267689
    Abstract: A lordotic implant has a frusto-conical shape with external threads. Prior to placement of the implant, vertebrae are distracted in a manner to provide a desired lordosis between the vertebrae. The pre-distracted vertebrae are then tapped to provide a tapped bore having a geometry matching the conical geometry of the implant. The threaded implant is then placed within the pre-tapped conical bore.
    Type: Grant
    Filed: March 23, 2004
    Date of Patent: September 11, 2007
    Assignee: Zimmer Spine, Inc.
    Inventors: Douglas W. Kohrs, Paul M. Sand
  • Patent number: 7135026
    Abstract: Spinal fusion implants are laparoscopically placed in a disk space separating two vertebrae. Implant tools, including distraction spacers, boring tools and implants, are passed through a cannula toward the disk space.
    Type: Grant
    Filed: July 25, 2003
    Date of Patent: November 14, 2006
    Assignee: Zimmer Spine, Inc.
    Inventors: Stephen D. Kuslich, Douglas W. Kohrs
  • Patent number: 6855166
    Abstract: The disclosure provides fusion implants, instruments and methods for insertion of the implants between opposing vertebral bodies to facilitate stabilization or arthrodesis of an intervertebral joint. A cross section through the longitudinal dimension of the implant is substantially configured in an ā€œIā€ shape. In addition to other features, the implants of the invention provide a reduced contact surface area with the interior surface of a bore formed for receiving the implant.
    Type: Grant
    Filed: February 6, 2001
    Date of Patent: February 15, 2005
    Assignee: Zimmer Spine, Inc.
    Inventor: Douglas W. Kohrs
  • Publication number: 20040249460
    Abstract: A lordotic implant has a frusto-conical shape with external threads. Prior to placement of the implant, vertebrae are distracted in a manner to provide a desired lordosis between the vertebrae. The pre-distracted vertebrae are then tapped to provide a tapped bore having a geometry matching the conical geometry of the implant. The threaded implant is then placed within the pre-tapped conical bore.
    Type: Application
    Filed: March 23, 2004
    Publication date: December 9, 2004
    Applicant: Sulzer Spine-Tech Inc.
    Inventors: Douglas W. Kohrs, Paul M. Sand
  • Patent number: 6740091
    Abstract: A lordotic implant has a frusto-conical shape with external threads. Prior to placement of the implant, vertebrae are distracted in a manner to provide a desired lordosis between the vertebrae. The pre-distracted vertebrae are then tapped to provide a tapped bore having a geometry matching the conical geometry of the implant. The threaded implant is then placed within the pre-tapped conical bore.
    Type: Grant
    Filed: October 16, 2002
    Date of Patent: May 25, 2004
    Assignee: Sulzer Spine-Tech Inc.
    Inventors: Douglas W. Kohrs, Paul M. Sand
  • Publication number: 20040015168
    Abstract: A surgical method and apparatus for implanting a spinal fusion implant includes a rigid centering guide having a distal end sized to be inserted into the disc space with the guide extending along a longitudinal axis from a distal end to a proximal end. The guide includes a first external guide surface which extends at least partially between the distal end and the proximal end. The external guide surface is shaped complimentary to an external guided surface of a drill guide. The external guide surface and the guided surface are nested such that the guided surface slides against the external guide surface along a path of travel parallel to the longitudinal axis.
    Type: Application
    Filed: May 13, 2003
    Publication date: January 22, 2004
    Applicant: Sulzer Spine-Tech Inc.
    Inventors: Kenneth S. Yonemura, Douglas W. Kohrs
  • Patent number: 6599320
    Abstract: An alignment guide for placing an intervertebral spinal implant into a disc space includes a body and a pair of parallel pins spaced at a predetermined distance from one another. The body may be x-ray transparent while the pins are made of material that is visible to x-ray, allowing the guide assembly to imaged in the spine using x-ray.
    Type: Grant
    Filed: August 6, 1999
    Date of Patent: July 29, 2003
    Assignee: Sulzer Spine-Tech Inc.
    Inventors: Stephen D. Kuslich, Douglas W. Kohrs
  • Patent number: 6562041
    Abstract: A surgical method and apparatus for implanting a spinal fusion implant includes a rigid centering guide having a distal end sized to be inserted into the disc space with the guide extending along a longitudinal axis from a distal end to a proximal end. The guide includes a first external guide surface which extends at least partially between the distal end and the proximal end. The external guide surface is shaped complimentary to an external guided surface of a drill guide. The external guide surface and the guided surface are nested such that the guided surface slides against the external guide surface along a path of travel parallel to the longitudinal axis.
    Type: Grant
    Filed: November 21, 2000
    Date of Patent: May 13, 2003
    Assignee: Sulzer Spine-Tech Inc.
    Inventors: Kenneth S. Yonemura, Douglas W. Kohrs
  • Publication number: 20030045938
    Abstract: A lordotic implant has a frusto-conical shape with external threads. Prior to placement of the implant, vertebrae are distracted in a manner to provide a desired lordosis between the vertebrae. The pre-distracted vertebrae are then tapped to provide a tapped bore having a geometry matching the conical geometry of the implant. The threaded implant is then placed within the pre-tapped conical bore.
    Type: Application
    Filed: October 16, 2002
    Publication date: March 6, 2003
    Applicant: Sulzer Spine-Tech Inc.
    Inventors: Douglas W. Kohrs, Paul M. Sand
  • Publication number: 20010011191
    Abstract: The disclosure provides fusion implants, instruments and methods for insertion of the implants between opposing vertebral bodies to facilitate stabilization or arthrodesis of an intervertebral joint. A cross section through the longitudinal dimension of the implant is substantially configured in an “I” shape. In addition to other features, the implants of the invention provide a reduced contact surface area with the interior surface of a bore formed for receiving the implant.
    Type: Application
    Filed: February 6, 2001
    Publication date: August 2, 2001
    Applicant: Sulzer Spine-Tech Inc.
    Inventor: Douglas W. Kohrs
  • Patent number: 6224631
    Abstract: The disclosure provides fusion implants, instruments and methods for insertion of the implants between opposing vertebral bodies to facilitate stabilization or arthrodesis of an intervertebral joint. A cross section through the longitudinal dimension of the implant is substantially configured in an “I” shape. In addition to other features, the implants of the invention provide a reduced contact surface area with the interior surface of a bore formed for receiving the implant.
    Type: Grant
    Filed: March 20, 1998
    Date of Patent: May 1, 2001
    Assignee: Sulzer Spine-Tech Inc.
    Inventor: Douglas W. Kohrs
  • Patent number: 6165219
    Abstract: A lordotic implant has a frusto-conical shape with external threads. Prior to placement of the implant, vertebrae are distracted in a manner to provide a desired lordosis between the vertebrae. The pre-distracted vertebrae are then tapped to provide a tapped bore having a geometry matching the conical geometry of the implant. The threaded implant is then placed within the pre-tapped conical bore.
    Type: Grant
    Filed: March 6, 1998
    Date of Patent: December 26, 2000
    Assignee: Sulzer Spine-Tech Inc.
    Inventors: Douglas W. Kohrs, Paul M. Sand
  • Patent number: 6156040
    Abstract: A surgical method and apparatus for implanting a spinal fusion implant includes a rigid centering guide having a distal end sized to be inserted into the disc space with the guide extending along a longitudinal axis from a distal end to a proximal end. The guide includes a first external guide surface which extends at least partially between the distal end and the proximal end. The external guide surface is shaped complimentary to an external guided surface of a drill guide. The external guide surface and the guided surface are nested such that the guided surface slides against the external guide surface along a path of travel parallel to the longitudinal axis.
    Type: Grant
    Filed: July 30, 1999
    Date of Patent: December 5, 2000
    Assignee: Sulzer Spine-Tech Inc.
    Inventors: Kenneth S. Yonemura, Douglas W. Kohrs
  • Patent number: 6120506
    Abstract: A lordotic implant has a frusto-conical shape with external threads. Prior to placement of the implant, vertebrae are distracted in a manner to provide a desired lordosis between the vertebrae. The pre-distracted vertebrae are then tapped to provide a tapped bore having a geometry matching the conical geometry of the implant. The threaded implant is then placed within the pre-tapped conical bore.
    Type: Grant
    Filed: July 29, 1997
    Date of Patent: September 19, 2000
    Assignee: Sulzer Spine-Tech Inc.
    Inventors: Douglas W. Kohrs, Paul M. Sand
  • Patent number: 6086595
    Abstract: A surgical method and apparatus for implanting a spinal fusion implant includes a rigid centering guide having a distal end sized to be inserted into the disc space with the guide extending along a longitudinal axis from a distal end to a proximal end. The guide includes a first external guide surface which extends at least partially between the distal end and the proximal end. The external guide surface is shaped complimentary to an external guided surface of a drill guide. The external guide surface and the guided surface are nested such that the guided surface slides against the external guide surface along a path of travel parallel to the longitudinal axis.
    Type: Grant
    Filed: August 29, 1997
    Date of Patent: July 11, 2000
    Assignee: Sulzer Spine-Tech Inc.
    Inventors: Kenneth S. Yonemura, Douglas W. Kohrs
  • Patent number: 6059790
    Abstract: The disclosure provides a surgical method and apparatus for implanting a spinal fusion implant into an intervertebral disc space. In one embodiment, the invention includes an alignment guide having a distal end sized to be inserted into the disc space with the guide extending along a longitudinal axis from a distal end to a proximal end and a multi-lumen drill tube that can be passed over the alignment guide. Other tools and methods of use are disclosed.
    Type: Grant
    Filed: July 16, 1998
    Date of Patent: May 9, 2000
    Assignee: Sulzer Spine-Tech Inc.
    Inventors: Paul M. Sand, Douglas W. Kohrs, Richard A. Erickson
  • Patent number: 5947971
    Abstract: Spinal fusion implants are inserted into a disc space of disc material separating first and second vertebrae by forming bores between the vertebrae. A distraction spacer is temporarily put in place on one side of the vertebrae while a bore is being formed on an opposite of the vertebrae.
    Type: Grant
    Filed: November 21, 1996
    Date of Patent: September 7, 1999
    Assignee: Sulzer Spine-Tech Inc.
    Inventors: Stephen D. Kuslich, Douglas W. Kohrs
  • Patent number: 5928242
    Abstract: Spinal fusion implants are laparoscopically placed in a disc space separating two vertebrae. Implant tools, including distraction spacers, boring tools and implants are passed through a hollow tube having exposed teeth and including a blunt sleeve slidably placed over the hollow tube.
    Type: Grant
    Filed: July 10, 1997
    Date of Patent: July 27, 1999
    Assignee: Sulzer Spine-Tech Inc.
    Inventors: Stephen D. Kuslich, Douglas W. Kohrs
  • Patent number: RE42863
    Abstract: Spinal fusion implants are inserted into a disc space of disc material separating first and second vertebrae by forming bores between the vertebrae. A distraction spacer is temporarily put in place on one side of the vertebrae while a bore is being formed on an opposite side of the vertebrae.
    Type: Grant
    Filed: October 4, 2001
    Date of Patent: October 25, 2011
    Assignee: Zimmer Spine, Inc.
    Inventors: Stephen D. Kuslich, Douglas W. Kohrs