Amputations involving bone loss

An employee was unscrewing fasteners to remove the guarding for a roll former machine to expose two sets of rollers. The employee then placed a flathead screwdriver perpendicular against the edge of one of the wheels in the set furthest away from his position to remove galvanized build-up. During this process, the screwdriver hit the wheel and was pulled into the rollers pinning the employee's left ring finger between the screwdriver handle and the machine. The shaft of the screwdriver then broke, releasing the employee's finger. The employee suffered a soft tissue injury and amputation of the left fourth digit. The machine was powered and operating at the time.