Purpose: We describe a new prosthetic graft aiming to restore normal valve configuration in systemic circulation. In vitro evaluation data and first clinical results are presented. Description: The aortic valve consists of three separate leaflets and sinuses of Valsalva interconnected through three straight interleaflet triangles. This shape has important implications on valve function. Evaluation: In vitro tests showed nearly normal hemodynamics, although root distensibility was decreased and bending deformation of the leaflets was increased due to the nonflexibility of the graft material. However, the anatomical shape of the aortic root was well preserved in vitro and also in vivo without contact of leaflets to the prosthesis wall. Conclusions: This new sinus prosthesis maintains normal configuration of the aortic root with three distinct sinuses of Valsalva and straight commissural pillars in systemic circulation. The noncompliant material induces abnormal leaflet bending during systole, but leaflets do not collide with the wall of prosthesis.