Smart Cuff.

Hospital-grade hemodynamic monitoring — the kind that decides whether a patient on bypass needs a fluid bolus or a vasopressor — runs on catheters threaded through the chest. Catheters are accurate. They’re also invasive, expensive, and unavailable outside the OR or ICU.

Smart Cuff asks a different question: how much of that information lives in the brachial artery, where a $30 cuff already sits? My answer, after three years of hardware, firmware, signal pipelines, and clinical data: more than the field assumed.

One automatic cuff inflation gives us four physiological windows — the pneumatic pressure trace, an ECG lead, the cuff-coupled respiration signal, and the oscillometric envelope itself. From those four, with the right physics-informed model, the cuff estimates cardiac output, BP, HRV, and respiratory rate — in one shot, no catheter.