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US6224631: Intervertebral implant with reduced contact area and method

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Filing Information

Inventor(s) Douglas W. Kohrs ·
Assignee(s) Sulzer Spine-Tech Inc. ·
Attorney/Agent(s) Merchant & Gould P.C. ·
Primary Examiner Bruce Snow ·
Application Number US9045213
Filing date 03/20/1998
Issue date 05/01/2001
Predicted expiration date 03/20/2018
U.S. Classifications 623/171.1  ·
International Classifications --
Kind CodeB1
International Classifications 623 17 · 623 16 · 623 1711 · 623 1715 · 623 1716 · 606 61 ·
26 Claims, 9 Drawings


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.

Independent Claims | See all claims (26)

  1. 1. An implant for intervertebral fusion between opposing first and second vertebrae, said implant comprising: a unitary implant body having a leading end and a trailing end spaced apart by a longitudinal dimension of the implant; and a trailing end view of said implant body having a substantially “I” shaped configuration comprising opposing first and second transverse members spaced apart by a central support member; said first transverse member having a first curved bearing surface and said second transverse member having a second curved bearing surface.
  2. 7. A implant for intervertebral fusion between opposing vertebrae, said implant comprising: a unitary implant body having a first end and a second end spaced apart by a longitudinal axis of said implant; said implant body comprising diametrically opposed first and second curved bearing surfaces, said first and second curved bearing surfaces being non-continuous; said first bearing surface having a first inner surface and said second bearing surface having a second inner surface, said first and second bearing surfaces facing away from one another and said first and second inner surfaces facing towards one another; said first and second curved bearing surfaces maintained in spaced apart relation by a central support member attached between said first and second inner surfaces, said central support member passing through a single plane between diametrically opposed regions of said first and second curved bearing surfaces.
  3. 23. An implant for intervertebral fusion between opposing first and second vertebrae, said implant comprising: an implant body having a leading end and a trailing end spaced apart by a longitudinal dimension of the implant; and a trailing end view of said implant body having a substantially “I” shaped configuration comprising opposing first and second transverse members spaced apart by a central support member; said first transverse member having a first curved bearing surface and said second transverse member having a second curved bearing surface; and said first and second curved bearing surfaces each including a portion of a helical thread pattern extending from said leading end to said trailing end of said implant body.

References Cited

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Foreign Patent Documents

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* cited by examiner

Other Publications

Ray Cervical Threaded Fusion Cage,

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