Finite Element Modeling of the Left Atrium to Facilitate the Design of an Endoscopic Atrial Retractor

Jernigan, Shaphan R.; Buckner, Gregory D.; Eischen, Jeffrey W.; Cormier, Denis

doi:10.1115/biomed2007-38014

Cited by 4 publications

(13 citation statements)

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“…Partial discrepancies between our findings and the results from Ref. [34] might be attributed to the different measurement techniques. Also, our thickness values represent an average of ten tissue specimens, whereas in Ref.…”

Section: Discussioncontrasting

confidence: 99%

“…Thickness values for the top of the LAA reported in Ref. [34] range from 2.2 mm to 5 mm and are consistent with our results. Partial discrepancies between our findings and the results from Ref.…”

Section: Discussionsupporting

confidence: 93%

“…i-^-RA,and RAA). Jemigan et al [34] obtained local thickness estimates from contrast enhanced MRI scans of an excised porcine left atrium. Thickness values of 4-8 mm and 4 mm were measured in the anatomical regions corresponding to LA^"t and LApost, respectively [34].…”

Section: Discussionmentioning

confidence: 99%

“…Jemigan et al [34] obtained local thickness estimates from contrast enhanced MRI scans of an excised porcine left atrium. Thickness values of 4-8 mm and 4 mm were measured in the anatomical regions corresponding to LA^"t and LApost, respectively [34]. Although our findings confirm that the posterior region of the left atrium in a healthy pig is thinner than the anterior region, our thickness measurements for the body of the left atrium never exceeded 2.7 mm (Table 1).…”

Section: Discussionmentioning

confidence: 99%

“…[31] for a review). Conversely, very limited information is available for the atria in terms of microstructure [32,33] or mechanical properties [34,35].…”

Section: Introductionmentioning

confidence: 99%

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A Mechanical Characterization of the Porcine Atria at the Healthy Stage and After Ventricular Tachypacing

Bellini

Martino

2012

Journal of Biomechanical Engineering

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Atrial fibrillation (AF) is a cardiac arrhythmia that highly increases the risk of stroke and is associated with significant but still unexplored changes in the mechanical behavior of the tissue. Planar biaxial tests were performed on tissue specimens from pigs at the healthy stage and after ventricular tachypacing (VTP), a procedure applied to reproduce the relevant features of AF. The local arrangement of the fiber bundles in the tissue was investigated on specimens from rabbit atria by means of circularly polarized light. Based on this, mechanical data were fitted to two anisotropic constitutive relationships, including a four-parameter Fung-type model and a microstructurally-motivated model. Accounting for the fiber-induced anisotropy brought average R(2) = 0.807 for the microstructurally-motivated model and average R(2) = 0.949 for the Fung model. Validation of the fitted constitutive relationships was performed by means of FEM simulations coupled to FORTRAN routines. The performances of the two material models in predicting the second Piola-Kirchhoff stress were comparable, with average errors <3.1%. However, the Fung model outperformed the other in the prediction of the Green-Lagrange strain, with 9.2% maximum average error. To increase model generality, a proper averaging procedure accounting for nonlinearities was used to obtain average material parameters. In general, a stiffer behavior after VTP was noted.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…[31] for a review). Conversely, very limited information is available for the atria in terms of microstructure [32,33] or mechanical properties [34,35].…”

Section: Introductionmentioning

confidence: 99%

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A Mechanical Characterization of the Porcine Atria at the Healthy Stage and After Ventricular Tachypacing

Bellini

Martino

2012

Journal of Biomechanical Engineering

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Evaluation of a novel atrial retractor for exposure of the mitral valve in a porcine model

Bean

Jernigan

Bolotin

et al. 2008

The Journal of Thoracic and Cardiovascular Surgery

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Objectives To describe a novel atrial retractor and compare 2 methods of intraoperative left atrial retraction (LA) for minimally invasive (MI) mitral valve (MV) repair. Methods Left atrial retraction was performed on 5 swine cadavers to evaluate performance (percent of MV annulus (MVA) accessible), encountered complications, ease of use, and surgical time for the MI atrial retractor (MIAR) and a HeartPort atrial retractor. Results Estimated accessibilities were 93.0 % (SE=3.2) and 92.7 % (SE=3.3), for the HeartPort and MIAR retractors, respectively, with a non-significant difference of 0.3%, (se=2.2%, p=.8832, df=34). Tissue damage occurred in 1 case for the MIAR retractor and 2 cases for the HeartPort retractor. The mean surgical times for retractor placement and MVA exposure were 107.4, and 39.2 seconds, for the HeartPort and MIAR retractors, respectively, with a highly significant difference of 68.2 seconds (p=.0092, df=4). Conclusions The MIAR retractor is a suitable alternative method of atrial retraction compared to standard techniques of retraction. While it provides comparable exposure of the MVA, it is less time consuming to place, provides subjectively more working volume within the LA, and has the advantage of minimal atriotomy incision length and customizable retraction.

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Research and development of a new RF-assisted device for bloodless rapid transection of the liver: Computational modeling and in vivo experiments

et al. 2009

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Background: Efficient and safe transection of biological tissue in liver surgery is strongly dependent on the ability to address both parenchymal division and hemostasis simultaneously. In addition to the conventional clamp crushing or finger fracture methods other techniques based on radiofrequency (RF) currents have been extensively employed to reduce intraoperative blood loss. In this paper we present our broad research plan for a new RF-assisted device for bloodless, rapid resection of the liver.

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Finite Element Modeling of the Left Atrium to Facilitate the Design of an Endoscopic Atrial Retractor

Cited by 4 publications

References 0 publications

A Mechanical Characterization of the Porcine Atria at the Healthy Stage and After Ventricular Tachypacing

A Mechanical Characterization of the Porcine Atria at the Healthy Stage and After Ventricular Tachypacing

Evaluation of a novel atrial retractor for exposure of the mitral valve in a porcine model

Research and development of a new RF-assisted device for bloodless rapid transection of the liver: Computational modeling and in vivo experiments

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