You could loft between the two circles and then try one of the many options for importing Dynamo geometry into Revit.
One possibility is the built-in DirectShape Node, which unfortunately tessellates your shape.:
The built-in “ImportInstance.ByGeometry” node does better and you can even apply a material from Revit’s Object Style dialog. However it’s very difficult to schedule and document the resulting element:
Another is the custom nodes from Spring Nodes. The SN DirectShape node does not support materials but it produces smooth shapes and performs quickly:
The more recently introduced Brep node supports materials but can’t handle cyclical faces due to API limitations. Therefore you’ll need to hack the face and make it non-cyclic:
And then there’s the “Springs.FamilyInstance.ByGeometry” node, which supports everything but comes at the price of slower performance. This node was actually just added to Dynamo 1.3 as a built-in but by default, it only creates the type, without placing it for you.
