Title :
A Shape Memory Polymer Dialysis Needle Adapter for the Reduction of Hemodynamic Stress Within Arteriovenous Grafts
Author :
Ortega, Jason M. ; Small, Ward, IV ; Wilson, Thomas S. ; Benett, William J. ; Loge, Jeffrey M. ; Maitland, Duncan J.
Author_Institution :
Lawrence Livermore Nat. Lab., Livermore
Abstract :
A deployable, shape memory polymer adapter is investigated for reducing the hemodynamic stress caused by dialysis needle flow impingement within an arteriovenous graft. Computational fluid dynamics simulations of dialysis sessions with and without the adapter demonstrate that the adapter provides a significant decrease in the wall shear stress. Preliminary in vitro flow visualization measurements are made within a graft model following delivery and actuation of a prototype shape memory polymer adapter. Both the simulations and the qualitative flow visualization measurements demonstrate that the adapter reduces the severity of the dialysis needle flow impingement on the vascular access graft.
Keywords :
biomedical materials; computational fluid dynamics; flow visualisation; haemodynamics; intelligent materials; polymer blends; shape memory effects; arteriovenous grafts; computational fluid dynamics; dialysis needle adapter; flow visualization; hemodynamic stress; shape memory polymer; wall shear stress; Computational fluid dynamics; Computational modeling; Fluid flow measurement; Hemodynamics; In vitro; Needles; Polymers; Shape measurement; Stress; Visualization; Computational fluid dynamics; dialysis needle; shape memory polymer; wall shear stress; Anastomosis, Surgical; Biocompatible Materials; Blood Pressure; Blood Vessel Prosthesis; Dialysis; Elasticity; Equipment Design; Equipment Failure Analysis; Needles; Polymers; Stress, Mechanical;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
DOI :
10.1109/TBME.2007.892927
