A two gram capsule sized medical device was implanted in a 92-year old patient at a hospital in Gurgaon, Haryana. The Micra Transcatheter Pacing System, the smallest pacemaker in the world, was successfully implanted in a 92-year old man at Medanta, The Medicity Hospital. The pacemaker, which is comparable in size to a vitamin capsule, was inserted in the patient's body through a catheter in a 30-minute procedure, which was painless and left no visible signs of a medical device under the skin, doctors said. The new pacemaker weighs just 2 grams, a lot less than the conventional 25 grams other mechanisms weigh.