In the hot rod world, they sell a conduit that looks like a spring and goes from jamb to door. Looking at my RB's Obsolete 2005 Issue #32 catalog, they can be found on page 205. Also as part of their power window kit. http://www.rbsauto.com/product.asp?Product_id=222685

More description at the Specialty Power Windows web site, the manufacturer of the product. http://www.specialtypowerwindows.com/powerwindow-wiperaccessories.htm

No personal experience with this product although I've seen them in use and the product has been on the market for ten or more years.