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Nanostim’s Mini Wireless Pacemaker Shows Promise in Study

Nanostim Inc.’s miniaturized pacemaker, a device the size of a AAA battery placed entirely in the heart, appeared promising in its first human trials.

The device from Nanostim, a closely held company that St. Jude Medical has said it will acquire by year’s end, doesn’t have the wires typical of a pacemaker. Wires carry an electrical charge from a battery-powered generator in the chest to the ventricle to prompt a regular heartbeat. Nanostim’s device, threaded through the femoral artery into the heart, is powered by a built-in battery that can last eight to 17 years.