# K921991: Plato Radiation Therapy Planning System

- Pathway: 510(k) (Traditional)
- Applicant: Nucletron-Oldelft Corp.
- Decided: Nov 27, 1992 after 213 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
No predicates in its family tree.
68 later devices descend from it; 3 cite it directly.
0 of 69 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- None. FDA has not posted a summary or statement for it, so its predicates are not known.

## Most influential descendants
- K970236: Theraplan Plus Version 1.2 (1997), 65 descendants of its own
- K031349: OTP 1.2 (2003), 59 descendants of its own
- K081281: Ocentra Masterplan 3.1 (Ocentra Brachy) (2008), 54 descendants of its own
- K092132: Xio RTP System (2009), 34 descendants of its own
- K083264: Rayautoplan 1.0 (2009), 31 descendants of its own

Source page: https://510kreport.com/device/K921991
Methodology: https://510kreport.com/methodology