Have you had a the kinked portion of a carmel x-rayed? It should be fairly inexpensive if your vet will work with you. Or you might be able to talk your local x-ray tech program/medical/vet college in to helping out with an x-ray.

I am just curious, if the kink is a crushed portion due to pressure or some other physical factor.

Sounds interesting I can't wait to hear the out come.

Good Luck!