| Flow directed | Over the wire catheters |
|---|---|
| extremely light and supple distal end so that they are carried by anterograde blood flow to target positron | These are pushed over a guide wire to the objective. |
| works best when blood flows is up. e.g. arterio-venous shunts | Used when blood flows is slower. |
| size limits the use of liquids and very small particles. | combination of guide wire + a stiffer catheters makes navigation easier. e.g. Head and neck tumour |
| Large lumen allows delivery of both particles and coils. |
Protection