A liquid infusion device comprises a bladder assembly and a flow-regulating portion. The bladder assembly comprises a tubular outer shaft, an inner shaft slidably received within the outer shaft and a bladder covering the outer and inner shafts. The bladder can inflate in both its radial and axial directions...http://www.google.fr/patents/US4909790?utm_source=gb-gplus-shareBrevet US4909790 - Liquid infusion device
