A device for delivering a powder to a target site, said device comprising: - a body (3,5); - a powder storage filled with the powder to be delivered to the target site; - a gas reservoir located within said body to be filled with a gas under pressure; - an outlet nozzle communicating with said powder storage; - a normally closed gas outlet valve located within said body (3,5) between said gas reservoir and said powder storage and being closed to block the flow of gas under pressure from said gas reservoir to said powder storage; and - an activation handle coupled to said normally closed gas outlet valve, said activation handle moving in a first direction relative to said body (3,5) in response to a force applied to said activation handle for causing said normally closed gas outlet valve to open and thereby enable a blast of gas under pressure to be applied from said gas reservoir to said powder storage, whereby at least some of the powder from said powder storage is entrained and delivered to the target site by way of said outlet nozzle characterized in that it further comprises a normally open gas inlet valve (24,25) located within said body (3,5) between said gas reservoir and a source of gas under pressure and being opened to permit said gas reservoir to be filled with the gas under pressure from the source thereof; and in that said activation handle is coupled to said normally open gas inlet valve (24,25) to cause said normally open gas inlet valve (24,25) to close and thereby prevent said gas reservoir from further receiving gas under pressure from said source when said activation handle moves in said first direction relative to said body (3,5) in response to said force applied to said activation handle. - a body (3,5); - a powder storage filled with the powder to be delivered to the target site; - a gas reservoir located within said body to be filled with a gas under pressure; - an outlet nozzle communicating with said powder storage; - a normally closed gas outlet valve located within said body (3,5) between said gas reservoir and said powder storage and being closed to block the flow of gas under pressure from said gas reservoir to said powder storage; and - an activation handle coupled to said normally closed gas outlet valve, said activation handle moving in a first direction relative to said body (3,5) in response to a force applied to said activation handle for causing said normally closed gas outlet valve to open and thereby enable a blast of gas under pressure to be applied from said gas reservoir to said powder storage, whereby at least some of the powder from said powder storage is entrained and delivered to the target site by way of said outlet nozzle characterized in that it further comprises a normally open gas inlet valve (24,25) located within said body (3,5) between said gas reservoir and a source of gas under pressure and being opened to permit said gas reservoir to be filled with the gas under pressure from the source thereof; and in that said activation handle is coupled to said normally open gas inlet valve (24,25) to cause said normally open gas inlet valve (24,25) to close and thereby prevent said gas reservoir from further receiving gas under pressure from said source when said activation handle moves in said first direction relative to said body (3,5) in response to said force applied to said activation handle.