Methods and apparatus for treating disc herniation and preventing the extrusion of interbody bone graft

Abstract

Methods and apparatus for treating disc herniation provide a conformable device which assumes a first shape associated with insertion and a second shape or expanded shape to occlude the defect which typically follows partial discectomy. The device may take different forms according to the invention, including patches size to cover the defect or plugs adapted to fill the defect. In a preferred embodiment, however, the device is a gel or other liquid or semi-liquid which solidifies to occlude the defect from within the body of the disc itself. In another preferred embodiment, a mesh screen is collapsed into an elongated form for the purposes of insertion, thereby minimizing the size of the requisite incision while avoiding delicate surrounding nerves. Such a configuration also permits the use of instrumentation to install the device, including, for example, a hollow tube or sheath adapted to hold the collapsed screen, and a push rod to expel the collapsed device out of the sheath for use in occluding the disc defect. A device according to the invention may further include one or more anchors to assist in permanently affixing the device with respect to the defect.

Description

REFERENCE TO RELATED APPLICATIONS [0001] This is a continuation of U.S. patent application Ser. No. 10 / 630,445, filed Jul. 30, 2003, which is a continuation of U.S. patent application Ser. No. 09 / 638,241, filed Aug. 14, 2000, which is a continuation-in-part of International Patent Application No. PCT / US00 / 14708, filed May 30, 2000, which is a continuation-in-part of and claims the benefit under 35 USC §119 of U.S. patent application Ser. No. 09 / 322,516, filed May 28, 1999, now U.S. Pat. No. 6,245,107. The '241 application also claims priority from U.S. Provisional Patent Application Ser. No. 60 / 148,913, filed Aug. 13, 1999. The entire content of each application and patent is incorporated herein by reference.FIELD OF THE INVENTION [0002] This invention relates generally to the prosthetic appliances and, in particular, to devices for occluding intervertebral disc defects and instrumentation associated with introducing such devices. BACKGROUND OF THE INVENTION [0003] Several hundred t...

AI Technical Summary

Benefits of technology

[0008] The device is preferably collapsible into some form for the purposes of insertion, thereby minimizing the size of the requisite incision while avoiding delicate surrounding nerves. Such a configuration also permits the use of instrumentation to install the device, including, for example, a hollow tube and a push rod to expel the device or liquefied material out of the sheath for use in occluding the disc defect.

[0009] A device according to the invention may further include one or more anchors to assist in permanently affixing the device with respect to the defect. For example, in the embodiment of a mesh screen, the anchors may assume the form of peripheral hooks configured to engage with the vertebra on either side of the disc. The invention further contemplates a distracting tool used to force the anchors into the vertebra. Such a tool would preferably feature a distal head portion conformal to the expanded shape of the device, enabling the surgeon to exert force on the overall structure, thereby setting the anchors.

Problems solved by technology

This results in pain and further complications, in many cases.

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