Promptus is a Denver, Colorado healthcare technology venture that develops validated medical IP into commercial-ready devices in house. Its first program is Safyr, a wearable cardiovascular sensing platform built on proprietary Vascular Impedance Mapping (VIM) technology, initially in a smart ring form factor. VIM uses a circular multi-sensor electrode array to measure changes in electrical impedance as blood flows through tissue, instead of the optical (PPG) sensing used by most wearables. The company reports a USPTO notice of allowance for the VIM patent in February 2026, an engineering partnership with Swiss research organization CSEM, pilot data in 37 volunteers correlating with cuff-based blood pressure, and a targeted FDA 510(k) submission in Q1 2028.