Product-type taxonomy differentiates stent-grafts by construction rather than indication, shaping hospital contracting, inventory burden, and unit economics. Non-spiral grafts—the conventional laser-cut nitinol or stainless-steel stents sewn to woven polyester—still generate >60% of revenues because their lower cost and long clinical track record fit constrained European and APAC budgets; however, competitive tendering is compressing ASPs 3–5% annually. Spiral grafts, where a helical wire backbone provides higher radial force and kink resistance, have captured ~40% share in North America and premium private systems, commanding a 20–25% price premium justified by lower 30-day re-intervention rates in tortuous aortas. Within each category, oversizing ranges (22–46 mm), proximal bare-stent variants, and tapered configurations further stratify SKUs, while physician preference and country-specific reimbursement lists ultimately determine uptake—evidence that Thoracic Aorta Stent Graft market taxonomy must capture both material science and health-system logistics.