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Illustration of the boundary conditions on the SG models in (a), followed by the global deformed state of RE-UL during 180° bending in (b), stretching condition applied to enforce a 35 mm sepa-
Source publication
Purpose
Inappropriate stent-graft (SG) flexibility has been frequently associated with endovascular aortic repair (EVAR) complications such as endoleaks, kinks, and SG migration, especially in tortuous arteries. Stents derived from auxetic unit cells have shown some potential to address these issues as they offer an optimum trade-off between radial...
Contexts in source publication
Context 1
... Bending (180°) • Each SG model endured a 180° bending operation, where both SG ends were represented as rigid bodies driven by reference points (RP1 and RP2), respectively, as shown in Fig. 2a, where the rotation-controlled boundary conditions were ...
Context 2
... Opposite rotations are applied at the reference points along the X-axis, as shown in Fig. 2a, with translation along the Z-axis only fixed for RP1, but allowed for RP2 to ameliorate the tension across the SG length in this step. Furthermore, out-of-plane rotations and translations along the other axes (Y and Z) were constrained to prevent rigid body motion. B. Adjustment (35 ...
Context 3
... Post-bending, the separation between RP1 and RP2 is regulated to reach a magnitude of 35 mm along the Z-axis using opposite translations at the reference points; thus, an effective visual comparison can be conducted between different SG candidates, as depicted in Fig. 2c. C. Intraluminal Pressurization (0.02 MPa) • Finally, the internal surface of the graft was subjected to a pressure of 150 mmHg (0.02 MPa), as illustrated in Fig. 2d with no other boundary conditions enforced on SG ...
Context 4
... of 35 mm along the Z-axis using opposite translations at the reference points; thus, an effective visual comparison can be conducted between different SG candidates, as depicted in Fig. 2c. C. Intraluminal Pressurization (0.02 MPa) • Finally, the internal surface of the graft was subjected to a pressure of 150 mmHg (0.02 MPa), as illustrated in Fig. 2d with no other boundary conditions enforced on SG ...
