A high-frequency miniature pressure ventilator system including a variable volume pressure chamber arranged to surround a portion of the thoracic cavity of a body so as to isolate the portion of the body from atmospheric pressure. A pump assembly is operable for varying the pressure within the chamber...http://www.google.fr/patents/US5871008?utm_source=gb-gplus-shareBrevet US5871008 - Miniature high-frequency ventilator
