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Oval cannula assembly and method of use

  • US 5,762,629 A
  • Filed: 05/02/1996
  • Issued: 06/09/1998
  • Est. Priority Date: 10/30/1991
  • Status: Expired due to Term
First Claim
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1. A percutaneous surgical disc procedure, comprising the steps of:

  • a) percutaneously entering the back of a patient in a posterolateral position with an obturator having a lumen;

    b) advancing the obturator through a percutaneously created fenestration of the annulus of the disc;

    c) placing a guide containing a generally oval shaped bore over the obturator;

    d) inserting an elongated member through the bore of the guide and into the back of the patient into the percutaneously created fenestration of the annulus of the disc, the elongated member having a cross-sectional shape such that when placed adjacent to the obturator, forms an assembly having an oval cross-section;

    e) removing the guide from the obturator and elongated member assembly;

    f) sliding an oval cannula having a bore with an oval transverse cross-section and proximal and distal ends, downwardly over the obturator and elongated member assembly;

    g) inserting the distal end of the oval cannula into the disc;

    h) removing the obturator and elongated member assembly from the bore of the oval cannula and the disc; and

    i) introducing multiple surgical instruments into the oval cannula to perform the surgical procedure.

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