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).
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Patent number: 7722621Abstract: 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: GrantFiled: July 19, 2006Date of Patent: May 25, 2010Assignee: Zimmer Spine, Inc.Inventors: Stephen D. Kuslich, Douglas W. Kohrs
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Patent number: 7267689Abstract: 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: GrantFiled: March 23, 2004Date of Patent: September 11, 2007Assignee: Zimmer Spine, Inc.Inventors: Douglas W. Kohrs, Paul M. Sand
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Patent number: 7135026Abstract: 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: GrantFiled: July 25, 2003Date of Patent: November 14, 2006Assignee: Zimmer Spine, Inc.Inventors: Stephen D. Kuslich, Douglas W. Kohrs
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Patent number: 6855166Abstract: 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 āIā 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: GrantFiled: February 6, 2001Date of Patent: February 15, 2005Assignee: Zimmer Spine, Inc.Inventor: Douglas W. Kohrs
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Publication number: 20040249460Abstract: 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: ApplicationFiled: March 23, 2004Publication date: December 9, 2004Applicant: Sulzer Spine-Tech Inc.Inventors: Douglas W. Kohrs, Paul M. Sand
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Patent number: 6740091Abstract: 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: GrantFiled: October 16, 2002Date of Patent: May 25, 2004Assignee: Sulzer Spine-Tech Inc.Inventors: Douglas W. Kohrs, Paul M. Sand
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Publication number: 20040015168Abstract: 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: ApplicationFiled: May 13, 2003Publication date: January 22, 2004Applicant: Sulzer Spine-Tech Inc.Inventors: Kenneth S. Yonemura, Douglas W. Kohrs
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Patent number: 6599320Abstract: 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: GrantFiled: August 6, 1999Date of Patent: July 29, 2003Assignee: Sulzer Spine-Tech Inc.Inventors: Stephen D. Kuslich, Douglas W. Kohrs
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Patent number: 6562041Abstract: 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: GrantFiled: November 21, 2000Date of Patent: May 13, 2003Assignee: Sulzer Spine-Tech Inc.Inventors: Kenneth S. Yonemura, Douglas W. Kohrs
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Publication number: 20030045938Abstract: 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: ApplicationFiled: October 16, 2002Publication date: March 6, 2003Applicant: Sulzer Spine-Tech Inc.Inventors: Douglas W. Kohrs, Paul M. Sand
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Publication number: 20010011191Abstract: 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: ApplicationFiled: February 6, 2001Publication date: August 2, 2001Applicant: Sulzer Spine-Tech Inc.Inventor: Douglas W. Kohrs
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Patent number: 6224631Abstract: 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: GrantFiled: March 20, 1998Date of Patent: May 1, 2001Assignee: Sulzer Spine-Tech Inc.Inventor: Douglas W. Kohrs
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Patent number: 6165219Abstract: 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: GrantFiled: March 6, 1998Date of Patent: December 26, 2000Assignee: Sulzer Spine-Tech Inc.Inventors: Douglas W. Kohrs, Paul M. Sand
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Patent number: 6156040Abstract: 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: GrantFiled: July 30, 1999Date of Patent: December 5, 2000Assignee: Sulzer Spine-Tech Inc.Inventors: Kenneth S. Yonemura, Douglas W. Kohrs
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Patent number: 6120506Abstract: 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: GrantFiled: July 29, 1997Date of Patent: September 19, 2000Assignee: Sulzer Spine-Tech Inc.Inventors: Douglas W. Kohrs, Paul M. Sand
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Patent number: 6086595Abstract: 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: GrantFiled: August 29, 1997Date of Patent: July 11, 2000Assignee: Sulzer Spine-Tech Inc.Inventors: Kenneth S. Yonemura, Douglas W. Kohrs
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Patent number: 6059790Abstract: 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: GrantFiled: July 16, 1998Date of Patent: May 9, 2000Assignee: Sulzer Spine-Tech Inc.Inventors: Paul M. Sand, Douglas W. Kohrs, Richard A. Erickson
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Patent number: 5947971Abstract: 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: GrantFiled: November 21, 1996Date of Patent: September 7, 1999Assignee: Sulzer Spine-Tech Inc.Inventors: Stephen D. Kuslich, Douglas W. Kohrs
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Patent number: 5928242Abstract: 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: GrantFiled: July 10, 1997Date of Patent: July 27, 1999Assignee: Sulzer Spine-Tech Inc.Inventors: Stephen D. Kuslich, Douglas W. Kohrs
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Patent number: RE42863Abstract: 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: GrantFiled: October 4, 2001Date of Patent: October 25, 2011Assignee: Zimmer Spine, Inc.Inventors: Stephen D. Kuslich, Douglas W. Kohrs