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Puncture needle assembly

  • US 4,682,980 A
  • Filed: 08/08/1986
  • Issued: 07/28/1987
  • Est. Priority Date: 08/19/1981
  • Status: Expired due to Term
First Claim
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1. A method for inserting a puncture needle assembly into a relatively deep blood vessel, said puncture needle assembly comprising a puncture needle having a point and being provided with a through bore, a transparent or translucent puncture needle hub fixed to the end of said puncture needle opposite to said point;

  • and an air vent plug adapted to be detachably connected to said puncture needle hub in a liquid-tight manner;

    said air vent plug having a pressing surface at the most distal end surface thereof opposite to said puncture needle and adapted to be engaged by a hand of a user for transmitting a puncture force from a hand of a user in the axial direction of said puncture needle via said pressing surface, said pressing surface being ring-like and defining an opening which is open to the atmosphere, and said air vent plug having a side peripheral wall adjacent said pressing surface;

    said air vent plug including means adapted to form, when it is connected to said puncture needle hub, a passage providing communication between said through bore of said puncture needle and the atmosphere, said passage being opened to the atmosphere through at least one side opening recessed from said pressing surface and opening into the side peripheral wall of said air vent plug, said at least one side opening being sized so as to be left uncovered by any part of the hand of the user when said puncture force is applied by said hand to said pressing surface at said distal end of the air vent plug; and

    an air-permeable blood-tight member disposed in said passage at the upstream side from said at least one side opening, said through bore of said puncture needle being in communication with the atmosphere through said air-permeable blood-tight member and said at least one side opening in said air vent plug;

    said method comprising the steps of;

    holding said puncture needle assembly in the hand of a user;

    putting a portion of the hand of the user on said pressing surface of said air vent plug;

    thrusting, by the user'"'"'s hand, the puncture needle assembly via an applied thrusting force on said air vent plug in the axial direction of said puncture needle assembly to transmit a puncture force from the user'"'"'s hand to said air vent plug and hence to said puncture needle while leaving open and uncovered said at least one side opening of said air vent plug; and

    directing the puncture needle of said puncture needle assembly to puncture the blood vessel responsive to said thrusting by the user.

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