curve constrain deformer and bones animation
 

i am using a curve contraint on a spline to make a hose deform with a null that has a point effector on it, until here everything works fine, the hose deform nicely....
but now in addition i want to add bones to my hose in order to animate it and give it a living look..
i tried to use the bones deformation for the spline but it does not affect the curve constrain.....
does anyone have a solution to this?
it is a pretty simple set up but i cannot find to to get through it
Thanks in advance

do have i to use the cloth plug in order to solve this problem?
i would like to avoid the maximun to complicate the scene with this kind of set up and calculations.

i have a strange bug too in the render raytraced, the deformad part get shaded in black instead of keeping it's texture. do someone has ran into this kind of trouble or am i lonely on the earth...

here is a pict
 

to illustrate the problem