Effectiveness and safety of external cardiac resuscitation is increased by the use of a small inflatable "pillow" which has a pressure gauge calibrated to read out the downward force or pressure applied to the victim's chest. The device is placed on the victim's chest and force is applied onto the device...http://www.google.com/patents/US4077400?utm_source=gb-gplus-sharePatent US4077400 - External cardiac resuscitation aid
