A powder inhalation device comprising a body (10) having a dispensing orifice (15), a plurality of pre-dosed reservoirs (21) each containing a dose of powder to be dispensed, said plurality of reservoirs (21) being formed on an elongate flexible blister strip (20), comprising a base layer (22) containing the cavities of the reservoirs and a closure layer (23) covering said cavities, the closure layer (23) being peelable from the base layer (22), the base layer portion (22) containing the empty blisters wrapping around a first rotatable receiving member (40) and the peeled closure layer portion (23) of said base layer (22). ) winding around a second rotary receiving member (50), said second rotary receiving member (50) being made of two parts, a first peeling wheel portion (51) and a second tensioning portion (52). ), said tensioner (52) being latched on said peel wheel (51) and rotatable relative to said peel wheel (51) only in a first direction of rotation, said tensioner (52) having a fastener (53) receiving the front end of said layer closure (23), said tensioner (52) rotating together with said peel wheel (51) in said first direction of rotation to wind said closure layer (23) upon each actuation of the device, and said tensioner (52) being rotatable with respect to said peel wheel (51) in said first direction of rotation to tension said closure layer (23) after assembling the blister strip (20) in the body (10).Dispositif d'inhalation de poudre, comportant un corps (10) pourvu d'un orifice de distribution (15), une pluralité de réservoirs prédosés (21) contenant chacun une dose de poudre à distribuer, ladite pluralité de réservoirs (21) étant formée sur une bande de blisters (20) souple allongée, comportant une couche de base (22) contenant les cavités des réservoirs et une couche de fermeture (23) recouvrant lesdites cavités, la couche de fermeture (23) étant pelable de la couche de base (22), la partie de couche de base (22) contenant les blisters vides s'enr
