p>No CAT Scan, MRI or Cancer drugs would have been invented without patents to give the inventors time to make their years of investment back by a period of exclusivity.
Really? Most fundamental medical advances are created in academia, mostly with public money. Many companies just take the relatively small step to a commercial product. William H. Oldendorf would have done his pioneering work on the CAT scan, whether there was a patent system or not. Indeed, looking at his wikipedia biography, he worked in public institutions for most of his life.
Most of the companies are LLC partnerships developed by the faculties at the Universities who then hire business staff to help run their inventions. It's a synergy of public/private cooperation. Get it? The OP talking about MRI can however thank Particle Physics and Particle Accelerators for the reason MRI, CAT Scans, and the like along with thousands of other advances needed as building blocks to solve a big science idea, for their existence.