Harvey is also notable for having used numerous methods to kill, such as arsenic; cyanide; insulin; suffocation; miscellaneous poisons; morphine; turning off ventilators; administration of fluid tainted with hepatitis B and/or HIV (which resulted in a hepatitis infection, but no HIV infection, and illness rather than death); insertion of a coat hanger into a catheter, causing an abdominal puncture and subsequent peritonitis.
Instead, all that is heard is the sound of Christopher's ventilator and the electrocardiogram machine.
Harvard Apparatus also developed first volume controlled- and then pressure controlled ventilators, pulsatile blood pumps, transducers, amplifiers, recorders, glassware and many other specialized bioscience research products.
After Hurricane Katrina, dedicated staff "bagged" patients in New Orleans hospitals for days with simple bag valve units attached to endotracheal tubes, a "ventilator" system which can be used with no definite time limit.
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In 1952, Roger Manley of the Westminster Hospital, London, developed a ventilator which was entirely gas driven, and became the most popular model used in Europe.
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