# Medical Devices; Neurological Devices; Classification of the Diagnostic Neurosurgical Microscope Filter
> **Food and Drug Administration** · Final amendment; final order. · Published 2021-12-29 · Effective 2021-12-29 · 86 FR 73971
## Document
- **Document number:** 2021-28160
- **Category:** fda-device
- **Sub-agency:** Food and Drug Administration
- **Federal Register citation:** 86 FR 73971
- **CFR reference:** 21 CFR 882
- **Publication date:** 2021-12-29
- **Effective date:** 2021-12-29
- **HHS docket:** Docket No. FDA-2021-N-0573
## Abstract

The Food and Drug Administration (FDA or we) is classifying the diagnostic neurosurgical microscope filter into class II (special controls). The special controls that apply to the device type are identified in this order and will be part of the codified language for the diagnostic neurosurgical microscope filter's classification. We are taking this action because we have determined that classifying the device into class II (special controls) will provide a reasonable assurance of safety and effectiveness of the device. We believe this action will also enhance patients' access to beneficial innovative devices.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/12/29/2021-28160/medical-devices-neurological-devices-classification-of-the-diagnostic-neurosurgical-microscope)
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