Portland Hospital Equipment Rentals-Ziehm Vision C-Arm Rental Oregon Ziehm Surgical C-Arm rentals in Portland, OR. The Ziehm Vision C-Arm Rental is unique in the fact that it offers Ziehm’s new flat panel image intensifier on the Vision FD model, while the Vision R model only has standard image intensifier. KenQuest Medical Equipment Rentals is a distributor of surgical equipment like this C-Arm rental in Portland, Eugene, Salem, Gresham, Hillsboro, Oregon.