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

Volume

54

Issue

9

fYear

2007

Firstpage

1722

Lastpage

1724

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;

fLanguage

English

Journal_Title

Biomedical Engineering, IEEE Transactions on

Publisher

ieee

ISSN

0018-9294

Type

jour

DOI

10.1109/TBME.2007.892927

Filename

4291667