Devices descending from K120676
5 later devices reach S-250 Proton Beam Radiation Therapy System through their predicates, nearest generation first.
| Generation | Number | Device | Applicant | Decided | Own descendants | Recalls |
|---|---|---|---|---|---|---|
| +1 | K172848 | MEVION S250i Proton Beam Radiation Therapy Device | Mevion Medical Systems | 2017 | 2 | 5 |
| +1 | K152224 | Proton Therapy System - Proteus 235 (Proteus One, Proteus Plus, Proteus TK2) | Ion Beam Application S.A. | 2016 | 4 | 7 |
| +2 | K250986 | S250-FIT Proton Beam Radiation Therapy Device (S250-FIT) | Mevion Medical Systems, Inc. | 2025 | 1 | — |
| +2 | K163500 | IBA Proton Therapy System- Proteus 235 (Proteus One, Proteus Plus, Proteus TK2, Proteus… | Ion Beam Applications S.A. | 2017 | 0 | 11 |
| +3 | K253406 | S250-FIT Proton Beam Radiation Therapy Device (S250-FIT) | Mevion Medical Systems, Inc. | 2026 | 0 | — |