An apparatus for delivering a powdered agent into a subject's body, the apparatus comprising: a powder chamber housing the powdered agent; a chassis in fluid connection with the powder chamber, wherein the chassis includes: a first passage (110; 122) for receiving a pressurized gas, a second passage (112; 126) for receiving the powdered agent from the powder chamber, a junction in fluid communication with the first passage (110; 122) and the second passage (112; 126), wherein at least a first portion of the pressurized gas is introduced into the powdered agent at the junction to fluidize the powdered agent, a third passage in fluid communication with the junction, wherein the third passage receives the fluidized powdered agent from the junction for exiting the chassis, and characterized in that the chassis includes a fourth passage (108; 124A; 124B) in fluid communication with the first passage (110; 122) and the second passage (112; 126) for directing a second portion of the pressurized gas from the first passage (110; 122) into the second passage (112; 126) to move the powdered agent in the second passage (112; 126) before the powdered agent is directed into the junction from the second passage (112; 126). a powder chamber housing the powdered agent; a chassis in fluid connection with the powder chamber, wherein the chassis includes: a first passage (110; 122) for receiving a pressurized gas, a second passage (112; 126) for receiving the powdered agent from the powder chamber, a junction in fluid communication with the first passage (110; 122) and the second passage (112; 126), wherein at least a first portion of the pressurized gas is introduced into the powdered agent at the junction to fluidize the powdered agent, a third passage in fluid communication with the junction, wherein the third passage receives the fluidized powdered agent from the junction for exiting the chassis, and characterized in that the chassis includes a fourth passage (108; 124A; 124B) in fluid communication with the first passage (110; 122) and the second passage (112; 126) for directing a second portion of the pressurized gas from the first passage (110; 122) into the second passage (112; 126) to move the powdered agent in the second passage (112; 126) before the powdered agent is directed into the junction from the second passage (112; 126). a first passage (110; 122) for receiving a pressurized gas, a second passage (112; 126) for receiving the powdered agent from the powder chamber, a junction in fluid communication with the first passage (110; 122) and the second passage (112; 126), wherein at least a first portion of the pressurized gas is introduced into the powdered agent at the junction to fluidize the powdered agent, a third passage in fluid communication with the junction, wherein the third passage receives the fluidized powdered agent from the junction for exiting the chassis, and characterized in that the chassis includes a fourth passage (108; 124A; 124B) in fluid communication with the first passage (110; 122) and the second passage (112; 126) for directing a second portion of the pressurized gas from the first passage (110; 122) into the second passage (112; 126) to move the powdered agent in the second passage (112; 126) before the powdered agent is directed into the junction from the second passage (112; 126).