clear minibuffer text wehn open a file

[tomer]

when load file I want to clear minibuffer text without killing to ring.

I use this code:
global-set-key [(control ?7)] 'tl-delete-line)
(defun tl-delete-line()
(interactive)
(beginning-of-line)
(kill-line)
(insert "/vobs/aaa/DV")
)


I use kill-line which add to the ring.I want to clear the line without saving 
to ring.
Is is possible ?

Thanks
Tomer