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Needle assisted jet injection device having reduced trigger force

  • US 10,357,609 B2
  • Filed: 05/16/2016
  • Issued: 07/23/2019
  • Est. Priority Date: 05/07/2012
  • Status: Active Grant
First Claim
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1. An injector, comprising:

  • a trigger mechanism including;

    a floating trigger member having a retaining portion,a ram assembly having a ram configured to pressurize a medicament container for expelling a medicament therefrom, the ram assembly further having a floating trigger engagement member configured to engage the retaining portion of the floating trigger member when the floating trigger member is in a pre-firing condition;

    an energy source associated with the ram for powering the ram to expel the medicament;

    a user-operable firing-initiation member operable for causing movement of the floating trigger member from the pre-firing condition to a firing condition in which the floating trigger engagement member is released from the retaining portion to allow the energy source to fire the ram; and

    an end cap comprising a ram holding member that axially retains the ram assembly in a proximal position against action of the energy source in the pre-firing position, the retaining portion retaining the floating trigger engagement member engaged and held against firing by the ram holding member wherein in the firing condition, the ram is disengaged from the retaining portion, and the energy source overcomes an engagement between the floating trigger engagement member and the ram holding member.

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