US Patent 11986409 Stent delivery under direct visualization

A system includes a deployment catheter having a lumen, a delivery sheath configured for positioning within the lumen of the deployment catheter, and a first measurement instrument configured for positioning within the delivery sheath. The first measurement instrument includes a plurality of expandable members each having a known diameter in an expanded state. The first measurement instrument is configured to determine a diameter of an anatomical lumen based on the known diameter of a most proximal expandable member that fits within the anatomical lumen.