A few months ago David Navazio, founder and CEO of medical supply company Gentell, had never heard of the Strait of Hormuz . But now, the narrow waterway thousands of miles away from the company's headquarters in Yardley, Pennsylvania, is impacting the company's operations in more ways than one. Chief among them is price, with Gentell under pressure from multiple angles. The company relies on derivatives from oil and gas production to manufacture its products, which includes medical dressings.