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). <EOS>