Like penicillin, this is another 
accidental invention that has saved so many lives to this day. An American engineer, Wilson Greatbatch, working with equipment that records an irregular heartbeat when he inserts a resistor of the wrong type into the invention.Circuit pulsed, then a pause, then pulsed again, pushing Greatbatch to compare this reaction with human heart and use it on as the first pacemaker implanted in the world could or implanted into the human body.
Prior versions may be used in humans implanted after 1960, pacemakers have been based on external model invented by Paul Zoll in 1952. This appliance is sized with a television and distributing electric shocks adjusted to the patient's body, which often cause skin burns. Greatbatch also developed his invention by using iodid lithium battery cells to move his heart pacemaker.
