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Injector with adjustable dosing

  • US 9,144,648 B2
  • Filed: 05/02/2007
  • Issued: 09/29/2015
  • Est. Priority Date: 05/03/2006
  • Status: Active Grant
First Claim
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1. An injector for injecting medicament in a patient, comprising:

  • a container comprising a fluid chamber containing a first volume of a medicament;

    an injection conduit associated with the chamber for defining a fluid pathway therefrom to inject the medicament from the chamber to an injection location;

    a firing mechanism associated with the fluid chamber for expelling the medicament from the chamber through the injection conduit,the firing mechanism comprising;

    a ram positioned along a longitudinal axis of the injector and configured to actuate the fluid chamber, the ram being biased toward a distal end of the injector;

    a trigger having protrusions that are resiliently biased outwardly relative to the longitudinal axis of the injector, the trigger protrusions being in a blocking association with the ram in a protecting position in which the injection conduit is disposed within a retractable guard;

    a slidable latch housing retaining the trigger protrusions in blocking association with the ram in the protecting position and allowing the trigger protrusions to move radially outwardly from the blocking association with ram in an injection position in which a tip of the injection conduit is exposed for injection of the medicament at an injection location;

    the retractable guard positioned at a distal end of the injector, the retractable guard being moveable between the protecting position and the injection position, wherein the retractable guard is associated with the latch housing such that when the retractable guard is retracted from the protecting position to the injection position it causes the latch housing to slide proximately to allow the trigger protrusions to move radially outwardly from the blocking association with the ram, thereby allowing the ram to actuate the fluid chamber; and

    a volume-control mechanism operable by a user to select a fraction of the first volume of medicament that is injected when the firing mechanism is actuated to inject the medicament,wherein the firing mechanism is configured to prevent resetting so as to prevent a subsequent injection of the medicament by the injector, thereby configuring the injector as a single-use injector of medicament.

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