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Injection needle assembly and drug injection device

  • US 9,302,051 B2
  • Filed: 03/02/2011
  • Issued: 04/05/2016
  • Est. Priority Date: 03/31/2010
  • Status: Active Grant
First Claim
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1. A drug administration device comprising:

  • a tubular section having a fluid chamber capable of accommodating a drug therein and a tubular discharge section formed at a tip end thereof;

    a pusher section having a gasket slidably movable within said fluid chamber and a plunger which is connected to said gasket and part of which is exposed outside from a base end of said tubular section;

    a tubular grip section disposed outside of said tubular section and kept away from said tubular section; and

    a connection section connecting said tubular section and said grip section; and

    said tubular section includes a first tubular portion wherein said fluid chamber is formed and a second tubular portion disposed contiguously from a base end of said first tubular portion, said grip section is disposed not to cover said first tubular portion but to cover at least part of said second tubular portion,said tubular section, said grip section and said connection section are integrally molded, andsaid first tubular portion has on the inner surface thereof a stopping portion for stopping said gasket, and said stopping portion is disposed in the vicinity of said connection section,said stopping portion for stopping the gasket is disposed in the vicinity of a boundary between a covered section of said first tubular portion where said grip section does not cover and an exposed section of said second tubular portion where said grip covers, and is disposed at a side of the exposed section, so that when said drug is filled in said fluid chamber, it is inhibited to withdraw said pusher section from said first tubular portion.

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