Evaluation of Stress Strain Patterns in a Stentless Aortic Valve and Its Leaflets
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Abstract
Objective: To design a new trileaflet aortic valve and investigate its mechanical behavior using finite ele- ment methods. Background: Quantification of aortic valve deformation during cardiac cycle is essential in understanding normal and pathological valvular function and eventually in the design of valves. We have designed and analyzed a new tissue valve model to investigate the mechanics of the valve and its components. Methods: Steps involves in 3D CAD based geometric modeling of a trileaflet aortic valve and the effects of different component dimensions on the mechanical behavior of valve is presented in this paper. Conceptual designing of individual components was used to build the total geometric model. Different physiological pressures were applied on the valve model and its deformation patterns were studied. Results: A new geometric model of a trileaflet aortic valve was designed. Its mechanical behavior was studied. Geometric analysis and simulation of these models enhanced the designer to optimize the geometry suitable for performance during and after implantation. Conclusion: The geometry-based model presented here allows determining quickly if the new set of valve component dimensions results in a functional valve. This is of great interest to designers of new prosthetic heart valve models, as well as to surgeons involved in valve- sparing surgery.
- D. Berdajs, P. Lajos and M. Turina, “The Anatomy of the Aortic Root,” Cardiovascular Surgery, Vol. 10, No. 4, 2002, pp. 320-327. doi:10.1016/S0967-2109(02)00018-2
- S. J. Choo, G. McRae, J. P. Olomon, G. St George, W. Davis, C. L. Burleson-Bowles, D. Pang, H. H. Luo, D. Vavra, D. T. Cheung, J. H. Oury and C. M. Duran “Aortic Root Geometry: Pattern of Differences between Leaflets and Sinuses of Valsalva,” The Journal of Heart Valve Disease, Vol. 8, No. 4, 1999, pp. 407-415.
- P. Dagum, R. Green, F. J. Nistal, et al., “Deformational Dynamics of the Aortic Root—Modes and physiology determinants,” Circulation 100 (Suppl II), II-54-II-62. 1999.
- T. E. David, “Aortic Valve-Sparing Operations,” The Annals of Thoracic Surgery, Vol. 73, No. 4, 2002, pp. 1029-1030. doi:10.1016/S0003-4975(02)03487-2
- K. Furukawa, H. Ohteki, Z.-L. Cao, K. Doi, Y. Narita, N. Minato and T. Itoh, “Does Dilatation of the Sinotubular Junction Cause Aortic Regurgitation?” The Annals of Thoracic Surgery, Vol. 68, No. 3, 1999, pp. 949-954. doi:10.1016/S0003-4975(99)00698-0
- K. S. Kunzelman, K. J. Grande, T. E. David, et al., “Aortic Root and Valve Relationships,” Journal of Thoracic Cardiovascular Surgery, Vol. 107, No. 6, 1994, pp. 162-170.
- E. Lansac, H. S. Lim, Y. Shomura, et al., “A Four-Dimensional Study of the Aortic Root Dynamics,” European Journal of Cardiothoracic Surgery, Vol. 22, No. 4, 2002, pp. 497-503. doi:10.1016/S1010-7940(02)00405-0
- K. J. Lockie, M. Butterfield, J. Fisher, et al., “Geometry of Homograft Valve Leaflets: Effects of Dilatation of the Aorta and of the Aortic Root,” The Annals of Thoracic Surgery, Vol. 60, 1993, pp. S384-S390.
- J. L. Mercer, M. Benedicty and H. T. Bahnson, “The Geometry and Construction of the Aortic Leaflet,” Journal of Thoracic Cardiovascular Surgery, Vol. 65, No. 4, 1973, pp. 511-518.
- W. M. Swanson and R. E. Clark, “Dimensions and Geometric Relationships of the Human Aortic Valve as a Function of Pressure,” Circulation Research, Vol. 35, No. 6, 1974, pp. 871-882.
- M. J. Thubrikar, “The Aortic Valve,” CRC Press, Boca Raton, 1990.
- M. J. Thubrikar, F. Robicsek, G. G. Gong and B. L. Fowler, “A New Aortic Root Prosthesis with Compliant Sinuses for Valvesparing Operations,” The Annals of Thoracic Surgery, Vol. 71, 2001, pp. S318-S322. doi:10.1016/S0003-4975(01)02541-3
- M. Trenkner, S. Raczynski and R. Gutkowski, “Optimal Diameter of the Stent for Aortic Valvular Grafts. I-Studies on Valve Function and Geometry,” Journal of Thoracic Cardiovascular Surgery, Vol. 72, No. 4, 1976, pp. 613-617.