The Pacemaker

In 1956, Wilson Greatbatch was building a heart rhythm recording device. He reached into a box for a resistor to complete the circuitry, but pulled out the wrong one - it wasn't quite the right size.

He installed the ill-fitting resistor and noticed that the circuit emitted electrical pulses. It made him think of the timing of the heartbeat.
Greatbatch had previously thought that electrical stimulation might be able to stimulate the circuitry of the heart if there was some kind of breakdown there - this new device made him think it might be possible to create a version small enough to actually provide this stimulation.

He began to shrink his device and on May 7, 1958, a version of his pacemaker was successfully inserted into a dog.

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