Surgery – Instruments – Orthopedic instrumentation
Reexamination Certificate
1999-06-04
2001-05-01
Mancene, Gene (Department: 3732)
Surgery
Instruments
Orthopedic instrumentation
Reexamination Certificate
active
06224603
ABSTRACT:
BACKGROUND OF THE INVENTION
A major problem when accessing a patient's intervertebral space during spinal surgery is the problem of avoiding sensitive nerves and ligaments during the operative procedure. When accessing the para-spinal space or a specific intra-discal space to perform a discal or intervertebral procedure, the optimal angle of approach to avoid sensitive nerves and ligaments is a posterolateral angle. However, this angle of approach is not practical when accessing the lower vertebrae, specifically the L5/S1 inter-vertebral space, due to the patient's ilium bone which blocks such an angle of approach. Consequently, when performing surgical procedures at L5/S1 it is necessary to enter the intervertebral space from another angle, thus increasing the danger of interfering with the cauda equina and ligaments at such lower vertebrae.
SUMMARY OF THE INVENTION
The present invention provides methods for percutaneously accessing the patient's intervertebral space by creating an access portal through the patient's ilium and into the patient's intervertebral space. The access portal created by the present invention is preferably at a posterolateral angle, (preferably in the range of 40 to 90 degrees to an anterior-posterior axis through the patient), thereby being at the optimal angle of approach to the intervertebral space for these lower L5/S1 vertebrae. Methods are also provided for advancing surgical instruments through the passage and into the intervertebral space.
A system is also provided for conveying and depositing bone wax into bone interstices created by the coring of the ilium, thereby reducing bleeding.
As dual cannulae system of accessing a patient's intervertebral space is also provided.
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Osman, MD, Saidi G. et al.,Endoscopic Transiliac Approach to L5-S1 Disc and Foramen: A Cadaver Study, Spine, 22, 11, pp. 1259-1263 (1997).
Mancene Gene
NuVasive, Inc.
Robert Eduardo C.
Townsend and Townsend / and Crew LLP
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