An artificial respirator includes an atomospheric opening, a corset for enclosing a patient's thorax, an inspiration tube connected at one end thereof to the corset, a suction pump, a switching device for connecting the other end of the inspiration tube to either the suction pump or to the atmospheric...http://www.google.co.uk/patents/US5101808?utm_source=gb-gplus-sharePatent US5101808 - Outside-of-thorax type negative pressure artificial respirator
