I have not used eheim brand hoses or filters however with clear vinyl (and green for that matter) I have solved it 2 ways:
1. Most effective, replace with a hose that's not kinked to begin with.
2. Do at your own risk of personal and pet safety: Place the kink in very hot water and manipulate the bend or in extreme cases blow in the hose to expand the kink. Be careful, there is much room for error and self inflicted wounds with this method.
Another method, you could cut out the kink and put in a hose splice with clamps.