510(k) · Cleared
ClearedRadioactive Cesium-131 Seeds/Sources
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Best Industries · KXK Source, Brachytherapy, Radionuclide
Cleared on Jun 4, 1993 after a 284-day review. FDA lists a 510(k) statement for it but has not posted the file, so its predicates are not known. 9 later devices descend from it.
- Decided
- Jun 4, 1993
- Review
- 284 days
- Class
- Class II
- Product code
- KXK
- Recalls
- None
- Predicates
- 0
9 later devices descend from it, 1 citing it directly.
- This deviceK924261 Radioactive Cesium-131 Seeds/SourcesBest Industries · 1993
- Descendant · cites it directly · 8 of its ownK030162 Lawrence Cserion, Model CS-1Isoray, Inc. · 2003
- Descendant · 2 generations on · 7 of its ownK062384 Cesium-131 Strand, Strand Preload, Preload, S-CartridgeIsoray, Inc. · 2006
- Descendant · 3 generations on · 4 of its ownK092136 Proxcelan CS-131 Preloaded Braided Strands, Model: PL-5Isoray Medical, Inc. · 2009
- Descendant · 4 generations on · 3 of its ownK180515 GammaTileIsoray Medical, Inc. · 2018
- Descendant · 5 generations on · 2 of its ownK190296 GammaTileGt Medical Technologies · 2019
Showing 5 of 9 descendants. See all descendants
Descendants cleared per year
Most influential descendants
Showing 5 of 9 · See all- K030162Lawrence Cserion, Model CS-1Isoray, Inc. · 2003 · cites it directly8descendants
- K062384Cesium-131 Strand, Strand Preload, Preload, S-CartridgeIsoray, Inc. · 2006 · 2 generations on7descendants
- K092136Proxcelan CS-131 Preloaded Braided Strands, Model: PL-5Isoray Medical, Inc. · 2009 · 3 generations on4descendants
- K180515GammaTileIsoray Medical, Inc. · 2018 · 4 generations on3descendants
- K190296GammaTileGt Medical Technologies · 2019 · 5 generations on2descendants
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| 0 (this device) | K924261 | Radioactive Cesium-131 Seeds/Sources | Best Industries | 1993 | — |
| +1 | K030162 | Lawrence Cserion, Model CS-1 | Isoray, Inc. | 2003 | — |
| +2 | K062384 | Cesium-131 Strand, Strand Preload, Preload, S-Cartridge | Isoray, Inc. | 2006 | — |
| +3 | K092136 | Proxcelan CS-131 Preloaded Braided Strands, Model: PL-5 | Isoray Medical, Inc. | 2009 | — |
| +4 | K180515 | GammaTile | Isoray Medical, Inc. | 2018 | — |
| +5 | K190296 | GammaTile | Gt Medical Technologies | 2019 | — |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2003 | 1 | 0 |
| 2006 | 1 | 0 |
| 2009 | 2 | 0 |
| 2018 | 1 | 0 |
| 2019 | 1 | 0 |
| 2020 | 2 | 0 |
| 2022 | 1 | 0 |
Sources: FDA 510(k) database (decision fields), FDA recall and enforcement reports, and MAUDE; processed by 510(k) Report. Verify on FDA.gov · Methodology and accuracy.
Planning a device in KXK? 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 KXK device
- #1 K242818 IsoSpherescore 10.9 · 5 generations · no Class I recall
- #2 Held for the reportin the report
- #3 Held for the reportin the report
What was it cleared against?
FDA lists a 510(k) statement for it but has not posted the file, so its predicates are not known.
What descends from it? (9)
1 later device cites it directly; ranked here by how many devices descend from each in turn.
| Number | Device | Decided | Descendants |
|---|---|---|---|
| K030162 | Lawrence Cserion, Model CS-1 | 2003 | 8 |
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?
- Of its descendants, K030162 (Isoray, Inc., 2003) has gone furthest, with 8 descendants of its own.
How does its category compare?
All KXK devicesKXK Source, Brachytherapy, Radionuclide: FDA decisions, review times, recalls and adverse event reports over 20 years.
FDA decisions per year · KXK
2in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · KXK
158in 2020
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · KXK
1in 2016
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · KXK
7in 2025
MAUDE reports naming product code KXK, 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 | 5 | 42 | 0 | 9 |
| 2008 | 1 | — | 1 | 15 |
| 2009 | 7 | 63 | 0 | 10 |
| 2010 | 1 | — | 0 | 0 |
| 2011 | 5 | 94 | 1 | 35 |
| 2012 | 3 | 109 | 1 | 4 |
| 2013 | 3 | 127 | 0 | 29 |
| 2014 | 8 | 96 | 0 | 13 |
| 2015 | 2 | — | 0 | 6 |
| 2016 | 4 | 49 | 1 | 40 |
| 2017 | 2 | — | 0 | 41 |
| 2018 | 1 | — | 0 | 28 |
| 2019 | 2 | — | 0 | 10 |
| 2020 | 3 | 158 | 0 | 15 |
| 2021 | 0 | — | 0 | 62 |
| 2022 | 1 | — | 0 | 26 |
| 2023 | 1 | — | 0 | 9 |
| 2024 | 0 | — | 0 | 15 |
| 2025 | 2 | — | 0 | 7 |
| 2026 | 0 | — | 0 | — |
https://510kreport.com/device/K924261 · printed Nov 5, 2026
Cite this page
510(k) Report. “K924261: Radioactive Cesium-131 Seeds/Sources.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 5, 2026. https://510kreport.com/device/K924261
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Record history
- FDA decision record loaded May 2, 2026
- Lineage and recalls computed Nov 3, 2026
- Page last updated Nov 3, 2026