The invention of the implantable cardiac pacemaker broke the barrier of primitive medical technology and has saved millions of lives since it was developed. In 1958, when it was invented, people suffering from certain types of cardiac diseases had no promising treatment options. The external cardiac pacemaker was being developed, but it was painful and forced people to live a sedentary lifestyle. The internal pacemaker controls an irregular heart rhythm allowing cardiac patients to live full and productive lives with few side effects. About one million people receive pacemakers worldwide every year, making it one of the most significant and impactful medical inventions to date.