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Needle having multiple electrodes

  • US 7,283,866 B2
  • Filed: 05/17/2005
  • Issued: 10/16/2007
  • Est. Priority Date: 05/18/2004
  • Status: Active Grant
First Claim
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1. An electromyopraphic needle comprising:

  • a shaft having a distal sharpened tip portion;

    first, second and third concentrically arranged electrodes;

    first and second insulation layers for separating the first and second electrodes and the second and third electrodes, respectively; and

    wherein the shaft has a substantially constant outer diameter proximally of and adjacent to the distal tip portion of the needle and wherein the third electrode is distanced from the distal tip portion and at least partly defines the outer diameter of the shaft proximally of and adjacent to the distal tip portion.

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