Lilly also purchased Cardiac Pacemakers Incorporated, a manufacturer of heart pacemakers in 1977. During these procedures, devices such as heart pumps, pacemakers, or defibrillators might be implanted. Placement of internal pacemakers and defibrillators are done through catheterization as well. Implanted medical devices such as pacemakers could malfunction because of these currents. In some cases, implants contain electronics, e.g. artificial pacemakers and cochlear implants. Further, electroacupuncture should be avoided at the spot of implanted electrical devices (such as pacemakers). Examples of such instruments include scalpels, hypodermic needles, and artificial pacemakers. Electromagnetic energy is theorized to cause interference with heart pacemakers and other medical devices. Solid-state batteries have found use in pacemakers, RFID and wearable devices. Some issues have arisen regarding the use of the data captured by devices like pacemakers. This system was also used to monitor patients with pacemakers in remote areas. Many of these have been made possible by the transition to microprocessor controlled pacemakers. They lack the stability required for long-term medical applications such as in pacemakers. They performed songs by the Beatles, the Searchers, and Gerry and the Pacemakers. Who hits, along with songs from Gerry and the Pacemakers, Bobby Darin and The Platters.