510(k) · Cleared
ClearedVSS, Virtual Simulation System
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Nucletron Corp. · IYE Accelerator, Linear, Medical
Cleared on May 6, 1998 as substantially equivalent to K923851 (Philips Medical Systems (Cleveland), Inc., 1992) and 2 other predicates after a 77-day review. Its family tree reaches back 3 generations to 1992.
- Decided
- May 6, 1998
- Review
- 77 days
- Class
- Class II
- Product code
- IYE
- Recalls
- None
- Predicates
- 3
Its longest line of descent runs back 3 generations to K914926 (1992). 10 ancestors in all, the oldest K894706 (1989). No later device cites it as a predicate yet.
- Root · 3 generations backK914926 Scandiplan - Version 338Scanditronix, Inc. · 1992
- 2 generations backK953391 Treatment Management SystemSiemens Medical Solutions USA, Inc. · 1996
- 1 generation backK964206 Nucletron Plato External Beam Planning RTS V2 and RTS 3D V2Nucletron Corp. · 1997
- This deviceK980629 VSS, Virtual Simulation SystemNucletron Corp. · 1998
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| −3 | K914926 | Scandiplan - Version 338 | Scanditronix, Inc. | 1992 | — |
| −2 | K953391 | Treatment Management System | Siemens Medical Solutions USA, Inc. | 1996 | — |
| −1 | K964206 | Nucletron Plato External Beam Planning RTS V2 and RTS 3D V2 | Nucletron Corp. | 1997 | — |
| 0 (this device) | K980629 | VSS, Virtual Simulation System | Nucletron Corp. | 1998 | — |
Other ancestors by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1992 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
Sources: FDA 510(k) database (decision fields), the FDA summary (predicates and indications), FDA recall and enforcement reports, and MAUDE; processed by 510(k) Report. Verify on FDA.gov · Methodology and accuracy.
Planning a device in IYE? A 510(k) Report weighs predicate choices, recall history and review times for a new device like this one.
Top candidate predicates for a new IYE device
- #1 K252977 Halcyon, Ethos Radiotherapy System (5.0)score 18.8 · 18 generations · no Class I recall
- #2 Held for the reportin the report
- #3 Held for the reportin the report
What was it cleared against? (3)
Devices the submitter claimed this one is substantially equivalent to (*), and reference devices cited for a specific test or feature (†), as written in the FDA summary.
| Type | Number | Device | Decided |
|---|---|---|---|
| * | K923851 | Acqsim Simulator/LocalizerSummary page 1…(s) Our Device is substantially equivalent to the legally marketed predicate devices cited in the table below. Manufacturer Device 510(k) # Picker International ACQSIM K923851 GE Medical Systems Advantage Sim K951830 Nucletron PLATO K964206 Appendix 5, page 2 Nucletron VSS Date : 11, Feb… | 1992 |
| * | K951830 | Advantage SimSummary page 1…nt to the legally marketed predicate devices cited in the table below. Manufacturer Device 510(k) # Picker International ACQSIM K923851 GE Medical Systems Advantage Sim K951830 Nucletron PLATO K964206 Appendix 5, page 2 Nucletron VSS Date : 11, February 1998 d. Description . " \/SS vir… | 1995 |
| * | K964206 | Nucletron Plato External Beam Planning RTS V2 and RTS 3D V2Summary page 1…ed predicate devices cited in the table below. Manufacturer Device 510(k) # Picker International ACQSIM K923851 GE Medical Systems Advantage Sim K951830 Nucletron PLATO K964206 Appendix 5, page 2 Nucletron VSS Date : 11, February 1998 d. Description . " \/SS virtual simulation describe… | 1997 |
What descends from it?
No later submission names this one as a predicate yet.
Has anything in its family been recalled? (0 Class I)
No FDA recall names this device.
No ancestor or descendant has a Class I recall.
What does this lineage say?
- The line of descent spans 6 years and passes through 3 companies; a new generation was cleared every 1.3 years on median.
- 1 of the 10 ancestors has a recall of any class.
- 6 other devices also cite its predicate K923851.
How does its category compare?
All IYE devicesIYE Accelerator, Linear, Medical: FDA decisions, review times, recalls and adverse event reports over 20 years.
FDA decisions per year · IYE
12in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · IYE
170in 2025
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · IYE
1in 2025
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · IYE
101in 2025
MAUDE reports naming product code IYE, not matched to any one device; reports are not rates.
View these four charts as a table
| Year | Decisions | Median 510(k) review, days | Recalls (Class I) | MAUDE reports |
|---|---|---|---|---|
| 2007 | 23 | 44 | 78 | 155 |
| 2008 | 14 | 69 | 49 | 114 |
| 2009 | 20 | 63 | 22 | 174 |
| 2010 | 23 | 74 | 27 | 246 |
| 2011 | 11 | 94 | 73 | 280 |
| 2012 | 28 | 106 | 20 | 128 |
| 2013 | 18 | 88 | 11 | 96 |
| 2014 | 20 | 100 | 14 | 124 |
| 2015 | 20 | 108 | 8 | 100 |
| 2016 | 21 | 97 | 7 | 97 |
| 2017 | 23 | 94 | 7 | 125 |
| 2018 | 21 | 58 | 7 | 85 |
| 2019 | 19 | 83 | 2 | 91 |
| 2020 | 20 | 67 | 4 | 74 |
| 2021 | 19 | 86 | 5 | 68 |
| 2022 | 12 | 172 | 3 | 66 |
| 2023 | 18 | 129 | 7 | 128 |
| 2024 | 9 | 239 | 1 | 81 |
| 2025 | 12 | 170 | 1 | 101 |
| 2026 | 14 | 120 | 4 | — |
What is it indicated for?
Virtual simulation with VSS is intended to be used to prepare geometric and anatomical data relating to a proposed radiation therapy treatment prior to dosimetry planning on a treatment planning system. Complex 3D volumes and field geometries can be visualised for plan preparation. When connected to a Nucletron Simulix radiation therapy simulator, the simulation of the planned treatment fields can be aided by automated set-up on the Simulix simulator.…
Read the full statement (114 words)
Virtual simulation with VSS is intended to be used to prepare geometric and anatomical data relating to a proposed radiation therapy treatment prior to dosimetry planning on a treatment planning system. Complex 3D volumes and field geometries can be visualised for plan preparation.
When connected to a Nucletron Simulix radiation therapy simulator, the simulation of the planned treatment fields can be aided by automated set-up on the Simulix simulator. Adjustments made on the Simulix can be reviewed on the virtual simulation system screen. A direct comparison of the CT-based treatment plan with the actual set-up on the Simulix, prior to patient treatment, can be made to verify the geometric beam parameters and set-up conditions.
Indications for use read by OCR from a scanned FDA summary, so letters may be misread. Check the PDF before quoting it.
https://510kreport.com/device/K980629 · printed Nov 4, 2026
Cite this page
510(k) Report. “K980629: VSS, Virtual Simulation System.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 4, 2026. https://510kreport.com/device/K980629
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Record history
- FDA decision record loaded May 2, 2026
- Summary read Oct 13, 2026 (extraction version 9eaa42aa01ed)
- Lineage and recalls computed Nov 3, 2026
- Page last updated Nov 3, 2026