Patent ID: 9693895
Date: 2017-07-04
CPC Classifications: A61F,A61M

Claim:
1. A hand-held gaseous injector apparatus, comprising: a syringe body with an outlet; a plunger slidably disposed in the syringe body and with the syringe body, defining a first chamber within the syringe body; a metering device, at least partially within the syringe body, configured to control a volume of at least the first chamber when a first fluid is introduced into the first chamber, wherein the metering device comprises a plurality of protrusions disposed inwardly from an inner wall of the metering device and a moveable selector with a protrusion that can be moved between positions in alignment with the plurality of protrusions disposed inwardly from the inner wall of the metering device, wherein each of the plurality of protrusions comprises a surface configured to contact the protrusion of the moveable selector to limit movement of the plunger to one of a plurality of different positions, each different position corresponding to a different volume of the first chamber; and a filling mechanism configured to direct the first fluid into the first chamber of the syringe body so as to move the plunger and expand the first chamber.