A device insertable in the ear canal for substance delivery to and/or extraction from the tympanic cavity is described that includes a stationary body having a distal surface, a proximal surface a movable body having a distal surface and a proximal surface, disposed within the stationary body and free to move relative to the stationary body in response to a pressure difference created in the ear canal and at least one piercing element having a distal end and a proximal end, disposed in the movable body.
