<p>Dr. Erik Kulstad, an ER Doctor at Christ Medical Center and the CEO of Advanced Cooling Technologies, poses with his invention, the Esophageal Cooling Device, at Garrett Technologies in Northbrook, Illinois on August 19, 2014.  Manuel Martinez/Crain's Chicago Business</p>

Dr. Erik Kulstad, an ER Doctor at Christ Medical Center and the CEO of Advanced Cooling Technologies, poses with his invention, the Esophageal Cooling Device, at Garrett Technologies in Northbrook, Illinois on August 19, 2014. Manuel Martinez/Crain's Chicago Business

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