"A study released this week by medical technology firm Covidien could lead to wider use of its tools that cut through blockages in leg arteries. The results showed that atherectomy the practice of trimming away the plaque that causes peripheral artery disease PAD is just as effective at restoring blood flow as traditional angioplasty and stents. The company says this is a major step forward in treating PAD because unlike stents atherectomy leaves no metal behind. A stent is a tiny metal wire mesh tube that props open an artery and is left there permanently. But in leg arteries the active flexing can cause a stent to break. Being able to clear the blockage just as well without stents reduces possible complications and gives greater flexibility to doctors later said Brian Verrier vice president and general manager of peripheral vascular for Covidien. This particular product plays very strongly into where we see the market going he said. The potential is huge. Atherectomy is only used in about  to  percent of PAD cases but Dr. Lawrence Garcia a principal investigator in the study said he expects that to change with these results. I think it has the potential to increase business for Covidien Garcia chief of interventional cardiology and vascular interventions at St. Elizabeths Medical Center in Boston said Thursday. He said he has no financial stake in the company. The study is the largest to look at the effectiveness of atherectomy Covidien said and enrolled  patients at  centers in the U.S. and Europe. Doctors found that Covidiens SilverHawk and TurboHawk devices which are snaked down through a small incision near the groin and basically shave away and remove the plaque performed as well after  months as angioplasty and stenting. The devices had been developed at EV Inc. a Plymouth medtech company that Covidien acquired in . Thomas Gunderson a senior analyst for Piper Jaffray  Co. said the Covidien study could lead to greater use of atherectomy and a bigger market. Its a good opportunity Gunderson said. This will reawaken both the users and the nonusers to say wait a second now we have data. Also of note Garcia said is that the procedure proved as effective at improving blood flow for patients with diabetes as those without diabetes. Its a key finding because patients with diabetes usually suffer from more advanced PAD and the blood vessels reclog faster than for those who do not. Covidien based in Ireland has its U.S. headquarters in Massachusetts. It also has a significant presence in the Twin Cities. In  it acquired EV a maker of technology that treats lower extremity vascular and neurovascular diseases. According to the American Heart Association about  million people in the U.S. are affected by PAD which can lead to heart attack stroke amputation and death. It occurs when arteries in the legs become narrowed or blocked by plaque. Blockages can result in severe pain limited mobility and nonhealing leg ulcers."