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Needle-less injection system

  • US 6,506,177 B2
  • Filed: 10/14/1998
  • Issued: 01/14/2003
  • Est. Priority Date: 10/14/1998
  • Status: Expired due to Fees
First Claim
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1. A needle-less hypodermic jet injection system including a hand-held injection unit and a separate energizing unit, said hand-held injection unit being configured for administering a liquid medication in the form of a hypodermic jet injection, said injection system comprising:

  • a hand-held injection unit including means for mounting thereto an injection cartridge with medication cylinder, injection nozzle, and injection piston;

    said hand-held injection unit also including an injection ram for driving said injection piston, a power unit which is pre-energized prior to each injection to store injection energy to be applied to the injection ram; and

    a trigger mechanism allowing the energy stored in the power unit to be released and applied in driving the injection ram to cause the medication to be ejected via said injection nozzle forming the hypodermic injection jet;

    said trigger mechanism including an outer trigger sleeve outwardly adapted to be manually grasped and movable axially along a portion of said hand-held injection unit, and forward movement of said outer trigger sleeve being effective to release the energy stored in the power unit; and

    a separate energizing unit with which the hand-held injection unit interfaces to be energized to store injection energy so as to subsequently power an injection;

    wherein said outer trigger sleeve outwardly carries a pair of diametrically opposed trigger members, each of said diametrically opposed trigger members extending outwardly relative to said hand-held injection unit, and said trigger members providing manual purchase for effecting forward movement of said outer trigger sleeve to release the energy stored in said power unit; and

    wherein one of said pair of diametrically opposed trigger members pivotally carrying a release member, and said release member being pivotal between a first position interposing a safety member between said trigger sleeve and a stop member, and said safety member in a second position withdrawing said safety member from interposition between said trigger sleeve and said stop member to allow said trigger sleeve to be manually moved forward along said hand-held injection unit.

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