Abstract
Arteriovenous prosthetic grafts are used in hemodialysis. Stenosis in the venous anastomosis is the main cause of occlusion and the role of local hemodynamics in this is considered significant. A new spiral graft design has been proposed to stabilize the flow phenomena in the host vein. Cross-flow vortical structures in the outflow of this graft were compared with those from a control device. Both grafts were integrated in identical in-house ultrasound-compatible flow phantoms with realistic surgical configurations. Constant flow rates were applied. In-plane 2-D velocity and vorticity mapping was developed using a vector Doppler technique. One or two vortices were detected for the spiral graft and two to four for the control, along with reduced stagnation points for the former. The in-plane peak velocity and circulation were calculated and found to be greater for the spiral device, implying increased in-plane mixing, which is believed to inhibit thrombosis and neo-intimal hyperplasia.
| Original language | English |
|---|---|
| Pages (from-to) | 760-774 |
| Number of pages | 15 |
| Journal | Ultrasound in Medicine and Biology |
| Volume | 41 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Mar 2015 |
Keywords
- Arteriovenous prosthetic grafts
- Circulation
- Color Doppler
- Flow mixing and stagnation
- Flow phantom
- Spiral flow
- Vector Doppler ultrasound
- Velocity
- Vortical structures
- Vorticity
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging
- Radiological and Ultrasound Technology
- Biophysics
