Create a tube with any desired bend using the Sweep function.
If your tube is contained in only one plane, then create the datum plane.
Next, create a datum curve with the desired bend, as this will be the trajectory.
Now create a sweep that will follow the trajectory.
The datum curve can be modified, length, angle, etc., if the tube needs to be edited.
If the tube requires more than one plane, create them as needed and create the trajectory.