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1. Create a new sketch, move to one end of the obstruction

2. Use Spline to mimic the artery boundary (just click on the edge of the artery that is visible and follow the dots that show up)

3. Use Offset Curve to create two more curves: one inside and one outside the artery

4. Return to 3D mode

5. Hide the artery

6. Delete the inner portions of the resulting surfaces leaving only the outer ring

7. Unhide the artery

8. Do the same on the other end of the obstruction

9. Hide the artery

10. Use Blend and then control + click the two faces that remain

11. Unhide the artery

12. Ctrl + Click the missing ellipse and fillet and click Fill if you haven’t already (Note, if a curve is made instead, use the stitch tool to combine the surfaces into a surface)

13. Use Combine as before to create three solids

14. Delete or suppress all entities except the artery

15. Use pull to smooth any sharp edges as desired

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