# K974310: Nomos Slit Collimator (Beak)

- Pathway: 510(k) (Traditional)
- Applicant: Nomos Corp.
- Decided: Feb 6, 1998 after 81 days
- Product code: IYE (Accelerator, Linear, Medical)
- Device class: 2
- Regulation: 21 CFR 892.5050
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
Longest line of descent: 1 generation back to K923522 (1993). 3 ancestors in all.
No later device cites it as a predicate yet.
0 of 4 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- K953482: Xknife-3, Radionics Software Applications, Inc. (1995) Summary page 1.
- K923522: Linac-Based Sterotactic Radiosurgery, Radionics Software Applications, Inc. (1993) Summary page 1.
- K940145: Compu-Cutter Therapeutic Shielding Cutting Device, Huestis Machine Corp. (1995) Summary page 1.

## Indications for use
The NOMOS Slit Collimator (BEAK™) is intended for use in Radiosurgery/Radiation Therapy to secondarily collimate the width of the radiation beam after it passes through the MIMiC® Multileaf Intensity Modulating Collimator (K940412). Several sizes of collimators will be provided with a slit width, at isocenter, ranging from 1 mm to 8 mm.

Source page: https://510kreport.com/device/K974310
Methodology: https://510kreport.com/methodology