"Under the Radar" is a daily feature that uncovers little-known companies worthy of investors' consideration. Check in at 5 every morning to find out about stocks that tend to beat their bigger brethren.IRVINE, CALIF. ( TheStreet) -- Heart disease is the leading cause of death in the U.S., U.K. and Canada. So our aging baby boomer population needs to improve its cardiovascular health. Here's a mid-cap health-care-equipment specialist that stands to benefit. Irvine, Calif.-based Edwards Lifesciences ( EW) began in 1958 when founder Miles "Lowell" Edwards decided he wanted to build the world's first artificial heart. Edwards was a career engineer with experience in hydraulics and fuel-pump operations and was up to the task of replication. But when he met Dr. Albert Starr, Edwards tempered his ambition. The two decided to narrow their focus and attempt construction of an artificial valve. Just two years after their initial collaboration, the Starr-Edwards mitral valve was successfully implemented in a live patient. Edwards Laboratories was founded soon after in Santa Ana, Calif. Today, the company has an array of devices designed to assist the human heart during normal activity and to aid surgeons performing complex operations. Edwards' focus has made it a leader in cardio devices. About 85% of the company's annual revenue is derived from brands with market-leading positions. Edwards' second-quarter revenue inched up 2% to $335 million, but net income increased 20% to $48 million and earnings per share climbed 21% to 81 cents, helped by a lower share count. The operating margin improved from 16% to 19% and the net margin jumped from 12% to 14%. Although Edwards' net margin is weaker than large-cap peers such as Baxter ( BAX) and Becton-Dickinson ( BDX), its stock receives a superior volatility score.