Surbhi Sarna is a partner at Y-Combinator and the author of Without A Doubt. Previously, she was the founder and former CEO of nVision Medical, which sold to Boston Scientific (NYSE: BSX) for $275M. nVision developed a first-in-kind microcatheter for the detection of ovarian cancer. After raising $17M in venture funding, completing three clinical trials, and obtaining two first-in-class FDA approvals, nVision was acquired by Boston Scientific for more than 15X money-in. Surbhi then stayed at Boston Scientific for two years, running the 150+ person commercial organization in preparation for launch. She is now Y-Combinator's only and first partner focused exclusively on healthtech, medical devices, and therapeutics and sits on both private and public company boards.