Patent ID: 7247151
Filing Date: 2007-07-24
Classification: A61M

Abstract:
1. An injector device comprising: a body having a syringe cavity and incorporating a syringe, the syringe comprising: a barrel defining a reservoir for an injectable medicament; an injection needle in communication with the reservoir such that the medicament content in the reservoir can be expelled from the reservoir via the needle; an internal piston which can be moved longitudinally only in an injecting direction along inside the barrel toward the needle to inject the medicament content through the needle, the needle having a point, and the syringe being slidably moveable within the syringe cavity in the body between a first configuration in which the needle has its point shielded, and a second configuration in which the needle is exposed for use for an injection to be administered; a plunger cavity; guide channels that extend along the sides of the plunger cavity; a plunger shaft located in the plunger cavity for moving the internal piston in the injecting direction, the plunger shaft having a head part with protrusions that are slidably received in the guide channels; and a snap-off cap that is attached to the body by a frangible link to close the plunger cavity and which must be removed to expose the head part of the plunger shaft prior to the injector device being used; wherein the plunger shaft is slidably moveable within the plunger cavity by a manual urging force applied to the head part by a user thereto toward the syringe to urge the syringe toward the second configuration and to urge the internal piston in the injecting direction; and wherein the syringe is biased to be returned toward its first configuration after the manual urging force has been removed.