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In-Vitro Modeling of the Dynamic Forces in the Femoropopliteal Artery

Nikanorov, Alexander ; Mach, Albert J. ; Lenaway, Lisa ; Zhao, Hugh ; Schwartz, Lewis B.

Fatigue and Fracture of Medical Metallic Materials and Devices: 2nd Volume, 2010, p.13-22 [Periódico revisado por pares]

100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International

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  • Título:
    In-Vitro Modeling of the Dynamic Forces in the Femoropopliteal Artery
  • Autor: Nikanorov, Alexander ; Mach, Albert J. ; Lenaway, Lisa ; Zhao, Hugh ; Schwartz, Lewis B.
  • Assuntos: Biomechanical Forces ; In-Vitro Model ; Popliteal Artery ; Stents ; Superficial Femoral Artery
  • É parte de: Fatigue and Fracture of Medical Metallic Materials and Devices: 2nd Volume, 2010, p.13-22
  • Notas: 2008-05-07Second International Symposium on Fatigue and Fracture of Medical Metallic Materials and DevicesDenver, CO
  • Descrição: The use of intravascular stents in the femoropopliteal artery (FPA) continues to be controversial due to the potential fractures in the dynamic environment. The purpose of this study was to (1) develop a representative in-vitro model that simulates physiological motion of the FPA during knee and hip flexion and (2) use the model to characterize the types and ranges of stent distortion produced by extremity movement. This model eliminates inconsistencies often observed in cadaveric models and clinical subjects due to individual anatomical differences, and allows testing with large sample sizes in a controlled environment for variable (tubing length, material, diameter, and thickness) modification. A comparative evaluation of axial mechanical property and elasticity was conducted between the tubing intended to simulate arteries and the ex-vivo porcine carotid arteries, favoring the selection of silicone tubing. The model was assessed for its unstented and stented arterial bending and axial compression under three physiological motions: straight leg, walking (knee/hip flexion 70°/20°), and sitting/stair climbing (knee/hip flexion 90°/90°). Self-expanding nitinol stents implanted in the simulated mid-superficial femoral artery and popliteal artery (PA) of the model exhibit axial compression of 4.5±0.3 % and 7±0.3 % (knee/hip flexion 70°/20°), and 8.4±0.7 % and 8±0.2 % (knee/hip flexion 90°/90°). Stents implanted in the simulated PA exhibit bending of 40° and 74° from knee/hip angle changes to 70°/20° and to 90°/90°, respectively. The model demonstrated stent bending and compression as previously observed in cadaver studies. Additional analysis of stent motion (torsion, localized bending, radial compression) may be evaluated with more advanced imaging techniques and additional model development. The data generated in these analyses could support appropriate modes and parameters for stent fatigue testing, and better understanding of vascular device performance in the dynamic FPA.
  • Editor: 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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