Evaluation of a shape memory alloy reinforced annuloplasty band for minimally invasive mitral valve repair
Purser, M. F., Richards, A. L., Cook, R. C., Osborne, J. A., Cormier, D. R., & Buckner, G. D. (2009). Evaluation of a shape memory alloy reinforced annuloplasty band for minimally invasive mitral valve repair. Annals of Thoracic Surgery, 88(4), 1312-1316. DOI: 10.1016/j.athoracsur.2009.04.133
Purpose. An in vitro study using explanted porcine hearts was conducted to evaluate a novel annuloplasty band, reinforced with a two-phase, shape memory alloy, designed specifically for minimally invasive mitral valve repair.
Description. In its rigid (austenitic) phase, this band provides the same mechanical properties as the commercial semi-rigid bands. In its compliant (martensitic) phase, this band is flexible enough to be introduced through an 8-mm trocar and is easily manipulated within the heart.
Evaluation. In its rigid phase, the prototype band displayed similar mechanical properties to commercially available semi-rigid rings. Dynamic flow testing demonstrated no statistical differences in the reduction of mitral valve regurgitation. In its flexible phase, the band was easily deployed through an 8-mm trocar, robotically manipulated and sutured into place.
Conclusions. Experimental results suggest that the shape memory alloy reinforced band could be a viable alternative to flexible and semi-rigid bands in minimally invasive mitral valve repair. (Ann Thorac Surg 2009; 88: 1312-6) (C) 2009 by The Society of Thoracic Surgeons