Significant increase in the useful lifetime of the implantable cardiac pacemaker has been made possible by the development of a radioisotope power source. This paper reports experience with two models, the AEC-ARCO Nu-5 (fixed rate) and the Medtronic Model 9000 (ventricular inhibited demand). Five of the former models were implanted in 1973, and six of the latter more recently. Both types of units have functioned well.
Smyth, Nicholas P. D.; Hernandez, Tomas; and Johnson, Alvin
"Clinical Experience with Radioisotopic Powered Cardiac Pacemakers,"
Henry Ford Hospital Medical Journal
: Vol. 22
Available at: https://scholarlycommons.henryford.com/hfhmedjournal/vol22/iss3/4