Denver C-Arm System Rentals-OEC 9400 C-Arm Imagining System For Rent In Colorado C-Arm Rentals in Denver, CO. The OEC 9400 C-Arm rental is the oldest model of the OEC line offered, however the system is a great unit for practices with low budgets that need a c-arm capable of performing basic fluoro procedures. Heartland Medical Sales and Service is a distributor of Used and Refurbished C-Arm Imaging System rentals in Denver, Colorado Springs, Aurora, Fort Collins, Colorado