Section 892.1610 - Diagnostic x-ray beam-limiting device(a)Identification. A diagnostic x-ray beam-limiting device is a device such as a collimator, a cone, or an aperture intended to restrict the dimensions of a diagnostic x-ray field by limiting the size of the primary x-ray beam.(b)Classification. Class II (special controls). The device is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 892.9 .48 FR 53047, Nov. 23, 1983, as amended at 84 FR 71818 , Dec. 30, 2019