There are many types of pacemaker with some helping assist the sinus node by pacing the heart’s top chambers...
Evolution of Pacemaker Implant
Pacemakers are electronic devices that help stimulate the heart to increase heart rates. The first pacemakers were made in the 1920s. These were large machines that were powered with a hand-crank. In the early 1950s, pacemakers were still very large and were powered by plugging into an outlet. It was in 1957 that the first battery powered pacemaker was produced. Early battery powered pacemakers were external with the device outside the body connected to wires in the heart. Devices evolved to pacemakers that were implantable, but were often placed in the abdomen due to their large size. As devices became smaller, they are now implanted on the chest wall through a small incision with wires placed in the heart through a small hole made in the blood vessels in the chest. The newest generation of pacemakers have no wires and are self contained. These are implanted through a small hole made in the blood vessel in the groin (femoral vein).