Material Properties of CorCap Passive Cardiac Support Device

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Presentation transcript:

Material Properties of CorCap Passive Cardiac Support Device Sam Chitsaz, MD, Jonathan F. Wenk, PhD, Liang Ge, PhD, Andrew Wisneski, MD, Aart Mookhoek, MS, Mark B. Ratcliffe, MD, Julius M. Guccione, PhD, Elaine E. Tseng, MD The Annals of Thoracic Surgery Volume 95, Issue 1, Pages 148-154 (January 2013) DOI: 10.1016/j.athoracsur.2012.07.036 Copyright © 2013 The Society of Thoracic Surgeons Terms and Conditions

Fig 1 Three silicone and 6 composite specimens used for biaxial stretching. Composite specimens were cut in different orientations: S1 to S3, silicone specimens; 1 to 9, composite specimens. The Annals of Thoracic Surgery 2013 95, 148-154DOI: (10.1016/j.athoracsur.2012.07.036) Copyright © 2013 The Society of Thoracic Surgeons Terms and Conditions

Fig 2 (A) Representative CSD/silicone composite specimen 4. (B) General definition of fiber angles in constitutive model. d1 and d2 are the vector directions for the fiber sets 1 and 2 respectively. e1 and e2 are the two principal stretching directions. α1 and α2 are the angles between the fiber vector direction and the principal stretching direction 1, for fiber sets 1 and 2 respectively. The Annals of Thoracic Surgery 2013 95, 148-154DOI: (10.1016/j.athoracsur.2012.07.036) Copyright © 2013 The Society of Thoracic Surgeons Terms and Conditions

Fig 3 Cauchy stress/Green strain plots after equibiaxial stretching of the silicone specimens in the 2 orthogonal orientations. (A) Direction 1. (B) Direction 2. The Annals of Thoracic Surgery 2013 95, 148-154DOI: (10.1016/j.athoracsur.2012.07.036) Copyright © 2013 The Society of Thoracic Surgeons Terms and Conditions

Fig 4 Cauchy stress/Green strain plots for all 6 CSD composite specimens after equibiaxial stretching in the 2 orthogonal directions, (A) Direction 1. (B) Direction 2. The Annals of Thoracic Surgery 2013 95, 148-154DOI: (10.1016/j.athoracsur.2012.07.036) Copyright © 2013 The Society of Thoracic Surgeons Terms and Conditions

Fig 5 Experimentally obtained Cauchy stress/Green strain data for representative CSD composite specimen 6 with 1 fiber family aligned with the direction of stretch. The calculated fit curves are shown as solid lines. The Annals of Thoracic Surgery 2013 95, 148-154DOI: (10.1016/j.athoracsur.2012.07.036) Copyright © 2013 The Society of Thoracic Surgeons Terms and Conditions

Fig 6 Representative fit curves based on average coefficients and angles for (A) the composites with 1 fiber set aligned with respect to the stretch axes (ie, composites 1 and 4) and (B) the composites oriented in a way closest to what the CorCap actually looks like when it is implanted (ie, composites 5 and 6). The Annals of Thoracic Surgery 2013 95, 148-154DOI: (10.1016/j.athoracsur.2012.07.036) Copyright © 2013 The Society of Thoracic Surgeons Terms and Conditions