= Valsalva graft
{c}
A \b[<Valsalva graft>] is a synthetic <vascular graft> with an expanded root region intended to reproduce the sinus-bearing geometry of the <aortic root>, rather than replacing it with one uniform straight tube. Its shape is relevant to the relationship between the <aortic valve>, <aortic sinuses> and <sinotubular junction>. It is a prosthetic conduit, not a biological valve leaflet.
The original 2000 design report described a modified textile conduit with a locally reoriented corrugation pattern. The modified section could expand circumferentially under pressure to create pseudosinuses, while the adjoining tube retained a different direction of adaptability.<A new aortic Dacron conduit for surgical treatment of aortic root pathology by Ruggero De Paulis and others>[p.457, Abstract; p.458, Methods and Figures 1–2]{ref} The engineering idea is to control where the conduit can expand, not simply to increase every dimension uniformly.
An original geometric illustration replaces a uniform circular tube of radius 1 cm and length 5 cm by one whose radius is 1.5 cm over a 2 cm segment and remains 1 cm elsewhere. The additional lumen volume is
$$
\Delta V=\pi(1.5^2-1^2)(2)=2.5\pi\,\mathrm{cm^3}\approx7.85\,\mathrm{mL}.
$$
The uniform model has volume $5\pi\approx15.71$ mL and the widened model $7.5\pi\approx23.56$ mL. These simplified dimensions are not device specifications or sizing instructions, and a stepped circular tube is not the complete three-sinus shape.
Geometric similarity also does not establish identical wall mechanics. A native root and a synthetic conduit can have different pressure-volume responses even if their outlines look alike. A meaningful physical comparison would record geometry and changes in volume or diameter under stated loading, together with leaflet motion or flow measurements as appropriate.
The Valsalva design thus illustrates why a root replacement is a coupled geometry-and-material problem. The source establishes the design and its initial observations; those facts should be kept separate from a blanket claim that every graft reproduces all native compliance or valve behavior.
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