Anterior spinal instrumentation and method for implantation and revision
First Claim
1. An apparatus for removal of a fusion implant in the disc space between adjacent vertebrae, comprising:
- a guide member having an elongated shaft and an engagement end having means for engaging the fusion implant within the disc space to permit removal of the implant from the disc space by the guide member; and
a cylindrical trephine concentrically disposed about said guide member, said trephine having a cutting end adjacent said engagement end of said guide member, said cutting end defining teeth for cutting a core of bone from the the adjacent vertebrae surrounding the fusion implant.
2 Assignments
0 Petitions
Accused Products
Abstract
A system and method for anterior fixation of the spine utilizes a cylindrical implant engaged in the intradiscal space at the cephalad and caudal ends of the construct. The implants are cylindrical fusion devices (10) filled with bone material to promote bone ingrowth and fusion of the disc space. An attachment member (40) is connected to each of the fusion devices (10) and a spinal rod (50) is connected to each of the attachment members using an eyebolt assembly (53, 54, 55). In a further inventive method, a revision of the construct is achieved by removing the fusion devices. Each fusion device is engaged by an elongated guide member (62) over which a cylindrical trephine (70) is advanced. The trephine (70) is used to extract a core (84) of bone material around the fusion implant, while the guide member (62) is used to remove the bone core (84) containing the fusion implant (10). In another aspect of the invention, a removal insert (90, 90'"'"') is provided that engages an implanted fusion device (10). The removal insert (90, 90'"'"') can be used to guide the trephine (70) around the fusion device, and is connected to a removal tool (100) once the bone core is created. The removal tool (100) includes a shaft (101) attached to the removal insert (90, 90'"'"'), and a slap hammer (104) slidably mounted on the shaft.
142 Citations
15 Claims
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1. An apparatus for removal of a fusion implant in the disc space between adjacent vertebrae, comprising:
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a guide member having an elongated shaft and an engagement end having means for engaging the fusion implant within the disc space to permit removal of the implant from the disc space by the guide member; and a cylindrical trephine concentrically disposed about said guide member, said trephine having a cutting end adjacent said engagement end of said guide member, said cutting end defining teeth for cutting a core of bone from the the adjacent vertebrae surrounding the fusion implant. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for removal of a device disposed within bone, comprising:
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a guide member having a body with conical portion at one end and an engagement portion at an opposite end configured to engage the device disposed within bone to permit removal of the device from the bone by the guide member; cylindrical trephine concentrically disposed about said guide member, said trephine having a cutting end adjacent said engagement end of said guide, member, said cutting end defining teeth for cutting a core of bone surrounding the device. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A removal insert for engagement between a device disposed within bone and a removal tool, said insert comprising:
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a body having a substantially cylindrical portion with a first end and an opposite second end; a conical portion attached to said body at said first end; and an engagement portion attached to said body at said second end, said engagement portion configured to engage the device disposed within bone. - View Dependent Claims (13, 14, 15)
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Specification