Correction: Insulin Pumps story

"It is a constant struggle for a patient who is an adolescent to stay in control of any therapy," said Steve Sabicer, a spokesman for Minneapolis-based Medtronic Inc., which makes the top-selling insulin pump. The company stands behind the product's safety and "the many years of clinical evidence that support the benefits of insulin pump therapy," he said.

Other companies with insulin pumps either on the market or in development include Abbott Laboratories, Johnson & Johnson's Animas Corp. and Insulet Corp.