Vertebral body prosthetic implant with slidably positionable stabilizing member
First Claim
1. A vertebral body prosthetic device for replacing a surgically removed natural vertebral body, comprising:
- a vertebral body prosthesis dimensioned and arranged to be positioned between first and second separated natural vertebral bodies, said vertebral body prosthesis having a first end surface for engaging the first natural vertebral body, a second end surface substantially opposite said first end surface for engaging the second natural vertebral body, an external peripheral surface connecting said first and second surfaces, and at least one axially extending channel formed on said external peripheral surface along a length extending between said first end surface and said second end surface; and
stabilizing means including axially extending plate means dimensioned and arranged to attach to one of said first and second natural vertebral bodies for securing said prosthetic vertebral body to said one of said first and second natural vertebral bodies, said stabilizing means being slidably positionable along said length of said at least one channel.
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Accused Products
Abstract
A spinal stabilization device positionable between neighboring vertebral bodies to provide rigid internal fixation thereof and thus stabilize a spinal column which has been rendered unstable by disease or injury. The device includes a vertebral body prosthesis dimensioned to act as a replacement for a damaged vertebral body and associated discs which have been removed. Once implanted, the prosthesis provides direct mechanical stability and preserves the original spacing between the neighboring vertebral bodies, thereby preventing nerve damage and ensuring proper tensioning of the soft tissue surrounding the implantation site. To facilitate long-lasting bony fixation, the prosthetic implant is fabricated from a rigid, tantalum foam material. The open surface porosity at the interface between the adjacent vertebral bodies and the prosthesis enhances the opportunity for axial bone growth to take place, and ultimately, for fusion of the adjacent vertebral bodies to occur. External axial grooves may also be provided to further accommodate bone ingrowth or adjunct stabilizing members.
426 Citations
20 Claims
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1. A vertebral body prosthetic device for replacing a surgically removed natural vertebral body, comprising:
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a vertebral body prosthesis dimensioned and arranged to be positioned between first and second separated natural vertebral bodies, said vertebral body prosthesis having a first end surface for engaging the first natural vertebral body, a second end surface substantially opposite said first end surface for engaging the second natural vertebral body, an external peripheral surface connecting said first and second surfaces, and at least one axially extending channel formed on said external peripheral surface along a length extending between said first end surface and said second end surface; and stabilizing means including axially extending plate means dimensioned and arranged to attach to one of said first and second natural vertebral bodies for securing said prosthetic vertebral body to said one of said first and second natural vertebral bodies, said stabilizing means being slidably positionable along said length of said at least one channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification