AUTOINJECTOR HAVING AN END-OF-DOSE VISUAL INDICATOR

摘要

An autoinjector that automatically retracts a needle contained therein includes an injection assembly, having a plunger and a movable piston coupled to the plunger, a retraction assembly coupled to the injection assembly, and an end-of-dose visual indicator disposed within the retraction assembly. The retraction assembly includes an opaque section, a transparent or translucent section coupled to the opaque section, and a drug container having a hypodermic needle. The end-of-dose visual indicator is disposed within the retraction assembly such that the indicator moves upwardly from the opaque section of the retraction assembly to the transparent or translucent section of the retraction assembly upon full administration of a drug solution or medicine contained within the drug container. The end-of-dose visual indicator may be configured according to many preferred embodiments, among which may include a hollow cylinder, a split indicator ring, a co-extruded ring, and a multi-faceted polygonal cylinder.

主权项

1. An auto-injector, comprising:
an injection assembly, including a plunger and a movable piston coupled to the plunger; a retraction assembly coupled to the injection assembly, the retraction assembly comprising an opaque section and a transparent or translucent section coupled to the opaque section; an injectable drug container having a proximal end and a distal end, the distal end being configured to receive an end-of-dose visual indicator; and an end-of-dose visual indicator disposed within the retraction assembly and configured to cooperate with the distal end of the drug container and move in concert with the drug container from within the opaque section of the retraction assembly into the transparent or translucent section of the retraction assembly upon completion of administration of the drug solution or medicine contained within the drug container and retraction of the drug container.