A composite wound dressing apparatus promotes healing of a wound via the use of a micropump system housed within a wound dressing member. The micropump system includes a miniature pump that applies a subatmospheric pressure to the wound to effectively draw wound fluid or exudate away from the wound bed...http://www.google.es/patents/US7838717?utm_source=gb-gplus-sharePatente US7838717 - Self contained wound dressing with micropump
