System and methods for cervical spinal fusion

• US 6,923,814 B1
• Filed: 10/29/2002
• Issued: 08/02/2005
• Est. Priority Date: 10/30/2001
• Status: Expired due to Term

• Current Assignee: Nuvasive Incorporated
• Original Assignee: Nuvasive Incorporated
• Inventors: Hildebrand, Bryan D., Martinelli, Scot, Miles, Patrick, Woolley, Troy, Kovach, Eric, Curran, Matthew, Arambula, Jared, Castleberry, Jeff
• Primary Examiner(s): Robert, Eduardo C.
• Assistant Examiner(s): COMSTOCK, DAVID C
• Application Number:
  US10/283,429
• Time in Patent Office: 1,008 Days
• Field of Search: 606/99, 606/104, 606/61, 606/205, 606/206, 606/207, 623/17.11, 623/17.16, 600/104, 600/106, 600/137, 243/26, 243/35, 243/50, 245/02, 245/04, 245/05, 245/15, 245/16, 245/18, 269/47, 269/48, 269/49, 269/60, 269/77, 269/78, 269/87.3, 269/91, 269/98, 269/100, 269/108, 269/188, 269/189, 269/217, 269/218, 269/256, 269/261, 269/264
• US Class Current: 606/99
• CPC Class Codes: A61F 2/4455 for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages intervertebral discs A61F2/442
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/2817 Bone stimulation by chemical reactions or by osteogenic or biological products for enhancing ossification, e.g. by bone morphogenetic or morphogenic proteins [BMP] or by transforming growth factors [TGF]
• CPC Class Codes: A61F 2002/2835 Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
• CPC Class Codes: A61F 2002/302 toroidal, e.g. rings
• CPC Class Codes: A61F 2002/30476 locked by an additional locking mechanism
• CPC Class Codes: A61F 2002/30601 telescopic
• CPC Class Codes: A61F 2002/30772 Apertures or holes, e.g. of circular cross section
• CPC Class Codes: A61F 2002/30795 Blind bores, e.g. of circular cross-section
• CPC Class Codes: A61F 2002/30904 serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/4627 with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2230/0065 toroidal, e.g. ring-shaped, doughnut-shaped

Abstract

A system for performing spinal fusion between adjacent cervical vertebrae, including an implant and an introducer system, and related methods.

Claims

1. An implant insertion device for inserting a spinal implant having at least two apertures defining a purchase region therebetween, comprising:

an elongate fork member having a pair of clamping arms extending generally parallel and away from the distal end of an elongate section, each clamping arm having an engagement feature dimensioned to slidably engage said apertures of said spinal implant, a thread feature at the proximal end of the elongate section and a generally cylindrical handling feature further proximal from said thread feature; and

a generally tubular member having a distal end, a bore dimensioned to receive a proximal portion of said elongate fork member therethrough from the distal end but smaller than the outer dimension of said clamping arms of said elongate fork member and a thread feature at the proximal end that is dimensioned to engage said thread feature of said elongate fork member, whereby clockwise rotation of said tubular lock member with respect to said elongate fork member will cause said distal end of said tubular lock member to force said clamping arms of said elongate fork member to displace laterally toward the longitudinal axis of said elongate fork member, the lateral displacement causing said engagement features to displace toward each other securing said spinal implant by creating a compressive force on said purchase region.

2. The implant insertion device of claim 1, wherein said engagement features are generally cylindrical pins mechanically coupled to and generally parallel to said longitudinal axis of said tubular lock member.

3. The implant insertion device of claim 1, further comprising at least two wings protruding radially from the outer surface of said tubular lock member providing a surface to ease rotation of said tubular lock member.

4. The implant insertion device of claim 1, wherein said generally cylindrical handling feature further comprises at least one generally flat facet on said generally cylindrical handling feature, and at least one channel circumscribing said generally cylindrical handling feature.

6. The implant insertion device of claim 1, wherein at least part of the implant insertion device is color-coded to indicate to the surgeon which size implant insertion tool to use depending upon the size of the spinal implant.

5. A method for performing spinal fusion comprising using a spinal implant having at least two apertures and a purchase region therebetween and an implant inserter engaging said spinal implant by slidably engaging said apertures and creating compressive force on said purchase region, comprising:

providing a spinal implant having top and bottom sides, lateral sides, a proximal side and a distal side, said top and bottom sides having a generally polygonal shape, said proximal side being intersected generally perpendicular by at least two apertures creating a purchase region therebetween;

providing a spinal implant insertion device having an elongate fork member and a tubular lock member, said elongate fork member having a pair of clamping arms extending generally parallel and away from the distal end of an elongate section, each clamping arm having an engagement feature dimensioned to slidably engage said apertures of said spinal implant, a thread feature at the proximal end of the elongate section and a handling feature further proximal from said thread feature and said generally tubular lock member having a distal end, a bore dimensioned to receive a proximal portion of said elongate fork member therethrough from the distal end but smaller than the outer dimension of said clamping arms of said elongate fork member and a thread feature at the proximal end that is dimensioned to engage said thread feature of said elongate fork member;

engaging said at least two apertures of said spinal implant with said engagement features of said elongate fork member;

rotating said tubular lock member clockwise with respect to said elongate fork member causing said distal end of said tubular lock member to force said clamping arms of said elongate fork member to displace laterally toward the longitudinal axis of said elongate fork member, the lateral displacement causing said engagement features to displace toward each other securing said spinal implant by creating a compressive force on said purchase region;

introducing said inserter and said secured spinal implant into a prepared intervertebral space;

rotating said tubular lock member counterclockwise with respect to said elongate fork member causing a reduction of said compressive force on said purchase region and allowing said engagement features of said elongate fork member to be slidably disengaged from said spinal implant; and

removing said spinal implant insertion device from said prepared intervertebral space.

7. The method of performing spinal fusion of claim 5, wherein at least part of the implant insertion device is color-coded to indicate to the surgeon which size implant insertion tool to use depending upon the size of the spinal implant.