Normalise heart rate with world's smallest pacemaker
A pacemaker similar to the size of a nickel can be implanted in patients to restore the heart's normal rhythm, when it is unable to pump enough oxygen-rich blood.

The device is the size of a large vitamin, and unlike traditional pacemakers, it does not require cardiac wires (leads) or a surgical "pocket" under the skin to deliver a pacing therapy. Micra TPS was designed with a unique feature that enables it to be permanently turned off so it can remain in the body and a new device can be implanted without risk of electrical interaction.

http://health.economictimes.indiatimes.com/news/medical-devices/normalise-heart-rate-with-worlds-smallest-pacemaker/56997502
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