Four medical device companies reeled in more than $70 million in recent weeks, to develop technologies including a laser scalpel for minimally invasive surgeries, a peripheral vessel stapler, a thermal ablation system and a biliary stent.

Cambridge, Mass.-based OmniGuide led the charge with a $35 million round from Orbimed Advisors. OmniGuide chairman Yoel Fink told MassDevice.com in 2010 that the device uses the mirror technology he pioneered at the Mass. Institute of Technology in the 1990s.