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Method of indwelling a needle assembly

  • US 9,265,915 B2
  • Filed: 09/26/2014
  • Issued: 02/23/2016
  • Est. Priority Date: 03/26/2010
  • Status: Active Grant
First Claim
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1. A method of indwelling a needle assembly comprising:

  • providing an assembled indwelling needle assembly including;

    an inner needle having a sharp needlepoint at a distal end;

    an inner needle hub fixed to a proximal portion of the inner needle;

    a hollow outer needle in which the inner needle is inserted;

    an outer needle hub fixed to a proximal portion of the outer needle; and

    a pressing member, which presses an intermediate portion of the outer needle between a proximal end and a distal end;

    arranging the indwelling needle assembly into a first position wherein the pressing member is disposed along an axis of the outer needle;

    moving a distal portion of the indwelling needle assembly to puncture a blood vessel of the patient with the sharp needlepoint of the inner needle with the pressing member contacting the intermediate portion of the outer needle;

    advancing the outer needle in a distal direction along the inner needle such that the intermediate portion of the outer needle is inserted into the blood vessel and a distal portion of the outer needle is inserted to a target position in the blood vessel; and

    holding the outer needle or the outer needle hub such that the outer needle is maintained indwelling in the blood vessel while simultaneously pulling the inner needle hub in a proximal direction such that the inner needle is pulled out from and entirely removed from the outer needle;

    wherein the advancing step includes first pushing the pressing member so as to advance the outer needle a minute distance and then, while holding the inner needle hub in a fixed position, gripping the outer needle hub and pushing the outer needle hub in a distal direction, thereby further advancing the outer needle along the inner needle.

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