Devices descending from K101294
10 later devices reach PT2 Varian Proton Therapy System through their predicates, nearest generation first.
| Generation | Number | Device | Applicant | Decided | Own descendants | Recalls |
|---|---|---|---|---|---|---|
| +1 | K133191 | Probeam Proton Therapy System | Varian Medical Systems | 2014 | 3 | 1 |
| +1 | K120676 | S-250 Proton Beam Radiation Therapy System | Mevion Medical Systems | 2012 | 5 | 12 |
| +2 | K221791 | ProBeam 360° Proton Therapy System | Varian Medical Systems, Inc. | 2022 | 2 | — |
| +2 | K172848 | MEVION S250i Proton Beam Radiation Therapy Device | Mevion Medical Systems | 2017 | 2 | 5 |
| +2 | K152224 | Proton Therapy System - Proteus 235 (Proteus One, Proteus Plus, Proteus TK2) | Ion Beam Application S.A. | 2016 | 4 | 7 |
| +3 | K252815 | ProBeam 360 Proton Therapy System v3.0 | Varian Medical Systems, Inc. | 2026 | 0 | — |
| +3 | K250986 | S250-FIT Proton Beam Radiation Therapy Device (S250-FIT) | Mevion Medical Systems, Inc. | 2025 | 1 | — |
| +3 | K231863 | ProBeam 360° Proton Therapy System v2.0 (Multiroom) | Varian Medical Systems, Inc. | 2023 | 1 | — |
| +3 | K163500 | IBA Proton Therapy System- Proteus 235 (Proteus One, Proteus Plus, Proteus TK2, Proteus… | Ion Beam Applications S.A. | 2017 | 0 | 11 |
| +4 | K253406 | S250-FIT Proton Beam Radiation Therapy Device (S250-FIT) | Mevion Medical Systems, Inc. | 2026 | 0 | — |