Patent ID: 9180259
Filing Date: 2015-11-10
Classification: A61M

Abstract:
1. A jet injector, comprising: a prefilled syringe comprising: 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.