Using a 3D printer, scientists have made an elastic membrane that closely mimics the outer layer of the heart's wall. The new membrane, which was described Tuesday (Feb. 25) in the journal Nature Communications, contains tiny sensors that can track the heart's temperature, pH, and level of strain. The device could one day be used to treat patients with rhythm disorders in the lower chambers of the heart, as well as the rhythm disorder atrial fibrillation, the researchers said... more