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Prefilled syringe jet injector

  • US 9,180,259 B2
  • Filed: 02/05/2014
  • Issued: 11/10/2015
  • Est. Priority Date: 01/24/2005
  • Status: Active Grant
First Claim
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1. A jet injector, comprising:

  • a prefilled syringe comprising;

    a container portion defining a fluid chamber containing a medicament,an injection-assisting needle disposed at a distal end of the fluid chamber, the injection-assisting needle having an injection tip configured for piercing an insertion location, and defining a fluid pathway in fluid communication with the fluid chamber for injecting the medicament from the fluid chamber into an injection site,wherein the injection-assisting needle is adhered to the container portion,a syringe body that includes a flange and a wall and hub of unitary construction, anda plunger movable within the fluid chamber;

    a housing that houses the prefilled syringe and is configured for allowing insertion of the injection-assisting needle at the injection location to an insertion point that is at a penetration depth below a surface at the insertion location, wherein the housing comprises a retractable guard that is movable between;

    a protecting position in which the injection-assisting needle is disposed within the guard; and

    an injecting position in which the tip of the injection-assisting needle is exposed for insertion to the insertion point;

    a syringe support supportively mounting the prefilled syringe to the housing;

    a syringe cushion associated with the syringe support and prefilled syringe and made of an elastomeric material to compensate for shape irregularities of the pre-filled syringe;

    an energy source configured for biasing the plunger with a force selected to produce an injecting pressure in the medicament in the fluid chamber that substantially remains below 500 p.s.i. during the injection of the medicament to jet inject the medicament from the fluid chamber through the injection-assisting needle to the injection site; and

    a trigger mechanism operably associated with the energy source for activating the energy source to jet inject the medicament, wherein the trigger mechanism is configured for activating the energy source after the retractable guard is retracted from the protecting position,wherein the penetration depth and injecting pressure are sufficient to substantially prevent backflow of the injected medicament.

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