A surgical instrument for use in connection with a pneumatically powered tool. IN various embodiments, the instrument include a drive system that is configured to apply at least one actuation motion to the pneumatically powered tool upon receipt of a flow of gas under pressure. The instrument may further comprise a material storage member that is fluidically coupled to the drive system. The material storage member may contain a material in a first non-gaseous state that selectively vaporizes into the gas under pressure upon actuation of the drive system. A power source for a gas driven device is also disclosed. In various embodiments, the power source comprises a material storage member that is fluidically coupled to the gas driven device. The material storage member contains a material having a first non-gaseous state and which selectively vaporizes into a gas under pressure upon actuation of the gas driven device.
