The National Institutes of Health (NIH), through the National Heart, Lung, and Blood Institute (NHLBI), has announced a funding opportunity titled "Catalyze Product Definition," aimed at supporting the development of medical device prototypes, diagnostic targets, and related research tools for heart, lung, blood, and sleep (HLBS) diseases. This initiative adopts a phased approach (R61/R33) to assist early-stage projects, focusing on preliminary prototype testing in the R61 phase and advancing to extensive development activities in the R33 phase, with a requirement for applicants to demonstrate novelty and a strong biological rationale supported by preliminary data. The program anticipates funding approximately $4.4 million annually from FY 2026 to FY 2028, with up to 24 awards available, and requires applicants to engage with an Accelerator Partner to enhance commercialization expertise. Interested parties can find more information and application guidelines at the NIH grants website, with a submission deadline of December 23, 2027.