Modelling entry and exit tear for 2D aortic dissection
 

Hey,
I am trying to carry forward 2D analysis fir aortic dissection with dimension specified in the image attached. I am trying to introduce an entry and exit tear of 2mm width and zero thickness in the Design Modeller but when I generate a surface, the openings are not at all visible. I know I am doing something wrong, but can someone tell me as to how I can rectify this error?
Cheers.

https://drive.google.com/file/d/0B_a...ew?usp=sharing