How check if a TopoDS_Wire has at least two edges that intersect

Hello
I built a TopoDS_Wire from non sorted edges following this post:
http://www.opencascade.org/org/forum/thread_5072/
But now I need check if at least two edges intersect. I was trying using ShapeAnalysis_Wire but this only let me check the intersection between two adjacent edges. I'll thanks any idea.
Thanks in advanced.