Oval cannula assembly and method of use
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United States of America Patent
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Jun 9, 1998
Issued Date -
N/A
app pub date -
May 2, 1996
filing date -
Oct 30, 1991
priority date (Note) -
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Abstract
The present invention os a method and apparatus for performing percutaneous surgical disc procedures. The method includes percutaneously entering the back of a patient in a posterolateral position with an obturator and advancing the obturator through a percutaneously created fenestration of the annulus of the disc. A guide containing an oval shaped bore is placed over the obturator. An elongated member, having a cross-sectional shape such that when placed adjacent to the obturator forms an assembly having an oval cross-section, is inserted through the bore of guide and into the back of the patient and the fenestration of the annulus of the disc, The guide is removed and an oval cannula having a bore with an oval transverse cross-section and a proximal and distal end, is slid downwardly over the obturator and elongated member assembly. The distal end of the oval cannula is inserted into the disc. The obturator and the elongated member assembly are removed from the bore of the oval cannula and multiple surgical instruments are introduced into the oval cannula to perform the surgical procedure.
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