Medtronic, the medical technology company poised to buy the Dublin-based Covidien plc and move here for tax purposes, said its quarterly sales grew 5% as demand rose for its pacemakers and aortic valves. 

Medtronic, the world’s biggest maker of heart-rhythm devices, said fiscal first-quarter sales missed analysts’ estimates on weaker-than-expected demand for defibrillators and the InFuse bone-growth product.