| 摘要 |
A gaseous injector apparatus includes a syringe body, a plunger disposed in the syringe body, a metering device, and a filling mechanism. The hand-held gaseous injector can further include a first chamber within the syringe body defined by the plunger with the syringe body. The metering device can be configured to control a volume of the first chamber when a gas is introduced into the chamber. The filling mechanism can be configured to direct the gas into the first chamber so as to move the plunger and expand the first chamber. |
