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Devices and methods for percutaneous surgery

  • US 6,162,170 A
  • Filed: 01/20/1999
  • Issued: 12/19/2000
  • Est. Priority Date: 03/22/1996
  • Status: Expired due to Term
First Claim
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1. A method for manufacturing an apparatus for use in percutaneous surgery on the spine of a patient, comprising the steps of:

  • (a) measuring a distance from the lamina of a spinal vertebra to the skin of the patient;

    (b) determining a first portion of a length of a cannula to be less than the distance measured in step (a), the first portion for introduction into the patient;

    (c) determining a second portion of the length of the cannula to be about one-fourth (1/4) of the length of the first portion, the second portion external to the patient; and

    (d) providing the cannula having the length determined according to steps (b) and (c).

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