510(k) · Cleared
ClearedLimbus Contour
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Limbus Ai, Inc. · LLZ System, Image Processing, Radiological
Cleared on Aug 13, 2020 as substantially equivalent to K173420 (Microsoft Corp., 2017) after a 98-day review. Its family tree reaches back 10 generations to 1996. 2 later devices descend from it.
- Decided
- Aug 13, 2020
- Review
- 98 days
- Class
- Class II
- Product code
- LLZ
- Recalls
- None
- Predicates
- 1
Its longest line of descent runs back 10 generations to K954874 (1996). 54 ancestors in all, the oldest K885054 (1989). 2 later devices descend from it, 1 citing it directly.
- Root · 10 generations backK954874 Spectef ProtocolGE Medical Systems · 1996
- 6 generations between
- 3 generations backK071964 Mim 4.1 (Seastar)Mimvista Corp. · 2007 · Recalled
- 2 generations backK103576 Mim 5.2 (Brachy)Mim Software, Inc. · 2011
- 1 generation backK173420 Radiomics App v1.0Microsoft Corp. · 2017
- This deviceK201232 Limbus ContourLimbus Ai, Inc. · 2020
- Descendant · cites it directly · 1 of its ownK230575 Limbus ContourLimbus Ai, Inc. · 2023
- Descendant · 2 generations on · 0 of its ownK241837 Limbus ContourLimbus Ai, Inc. · 2024
Show all 10 generations
- Root · 10 generations backK954874 Spectef ProtocolGE Medical Systems · 1996
- 9 generations backK980914 Emory Cardiac Tool BoxEmory University · 1998
- 8 generations backK992450 Emory Cardiac Toolbox* 2.0 Executing on Nuclear Medicine ComputersEmory University · 1999
- 7 generations backK014033 Emory Cardiac Toolbox 2.1 Executing on Nuclear Medicine ComputersSyntermed, Inc. · 2002
- 6 generations backK040141 Emory Cardiac Toolbox Version 2.6Syntermed, Inc. · 2004
- 5 generations backK052379 Mim 3.5 (Circa)Mimvista Corp. · 2005
- 4 generations backK060816 Mim 4.0 (NeuroMimvista Corp. · 2006 · Recalled
- 3 generations backK071964 Mim 4.1 (Seastar)Mimvista Corp. · 2007 · Recalled
- 2 generations backK103576 Mim 5.2 (Brachy)Mim Software, Inc. · 2011
- 1 generation backK173420 Radiomics App v1.0Microsoft Corp. · 2017
- This deviceK201232 Limbus ContourLimbus Ai, Inc. · 2020
Most influential descendants
Showing 2 of 2 · See allView FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| −10 | K954874 | Spectef Protocol | GE Medical Systems | 1996 | — |
| −9 | K980914 | Emory Cardiac Tool Box | Emory University | 1998 | — |
| −8 | K992450 | Emory Cardiac Toolbox* 2.0 Executing on Nuclear Medicine Computers | Emory University | 1999 | — |
| −7 | K014033 | Emory Cardiac Toolbox 2.1 Executing on Nuclear Medicine Computers | Syntermed, Inc. | 2002 | — |
| −6 | K040141 | Emory Cardiac Toolbox Version 2.6 | Syntermed, Inc. | 2004 | — |
| −5 | K052379 | Mim 3.5 (Circa) | Mimvista Corp. | 2005 | — |
| −4 | K060816 | Mim 4.0 (Neuro | Mimvista Corp. | 2006 | 1 |
| −3 | K071964 | Mim 4.1 (Seastar) | Mimvista Corp. | 2007 | 2 |
| −2 | K103576 | Mim 5.2 (Brachy) | Mim Software, Inc. | 2011 | — |
| −1 | K173420 | Radiomics App v1.0 | Microsoft Corp. | 2017 | — |
| 0 (this device) | K201232 | Limbus Contour | Limbus Ai, Inc. | 2020 | — |
| +1 | K230575 | Limbus Contour | Limbus Ai, Inc. | 2023 | — |
| +2 | K241837 | Limbus Contour | Limbus Ai, Inc. | 2024 | — |
Other ancestors by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 4 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 4 | 0 |
| 2001 | 5 | 0 |
| 2002 | 3 | 0 |
| 2003 | 3 | 0 |
| 2004 | 4 | 0 |
| 2005 | 1 | 0 |
| 2006 | 1 | 0 |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2023 | 1 | 0 |
| 2024 | 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 LLZ? 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 LLZ device
- #1 K230955 syngo Application Softwarescore 21.5 · 11 generations · no Class I recall
- #2 Held for the reportin the report
- #3 Held for the reportin the report
What was it cleared against? (1)
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 |
|---|---|---|---|
| * | K173420 | Radiomics App v1.0Summary page 4…PREDICATE DEVICE Predicate Manufacturer: Microsoft Corp. Predicate Trade Name: Radiomics App v1.0 Predicate 510(k): K173420 No reference devices were used in this submission. IV. DEVICE DESCRIPTION Limbus Contour is a stand-alone software medical de… | 2017 |
What descends from it? (2)
1 later device cites it directly; ranked here by how many devices descend from each in turn.
| Number | Device | Decided | Descendants |
|---|---|---|---|
| K230575 | Limbus Contour | 2023 | 1 |
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 24 years and passes through 7 companies; a new generation was cleared every 2.3 years on median.
- 12 of the 54 ancestors have a recall of any class.
- Of its descendants, K230575 (Limbus Ai, Inc., 2023) has gone furthest, with 1 descendant of its own.
- 1 other device also cites its predicate K173420.
How does its category compare?
All LLZ devicesLLZ System, Image Processing, Radiological: FDA decisions, review times, recalls and adverse event reports over 20 years. 2020, this device’s year, is highlighted.
FDA decisions per year · LLZ
58in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · LLZ
173in 2025
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · LLZ
11in 2025
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · LLZ
116in 2025
MAUDE reports naming product code LLZ, 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 | 76 | 36 | 20 | 152 |
| 2008 | 94 | 52 | 32 | 154 |
| 2009 | 70 | 62 | 21 | 145 |
| 2010 | 51 | 98 | 17 | 145 |
| 2011 | 106 | 79 | 30 | 454 |
| 2012 | 82 | 87 | 12 | 266 |
| 2013 | 95 | 84 | 64 | 1,130 |
| 2014 | 78 | 89 | 6 | 15,631 |
| 2015 | 64 | 90 | 16 | 211 |
| 2016 | 82 | 90 | 12 | 290 |
| 2017 | 78 | 107 | 5 | 104 |
| 2018 | 104 | 105 | 7 | 72 |
| 2019 | 74 | 107 | 2 | 88 |
| 2020 | 81 | 115 | 6 | 82 |
| 2021 | 83 | 116 | 3 | 70 |
| 2022 | 65 | 137 | 4 | 28 |
| 2023 | 87 | 157 | 8 | 26 |
| 2024 | 62 | 131 | 6 | 42 |
| 2025 | 58 | 173 | 11 | 116 |
| 2026 | 45 | 110 | 14 | — |
What is it indicated for?
Limbus Contour is a software-only medical device intended for use by trained radiation oncologists, dosimetrists and physicists to derive optimal contours for input to radiation treatment planning. Supported image modalities are Computed Tomography and Magnetic Resonance. The Limbus Contour Software assists in the following scenarios: • Operates in conjunction with radiation treatment planning systems or DICOM viewing systems to load, save, and display…
Read the full statement (135 words)
Limbus Contour is a software-only medical device intended for use by trained radiation oncologists, dosimetrists and physicists to derive optimal contours for input to radiation treatment planning. Supported image modalities are Computed Tomography and Magnetic Resonance. The Limbus Contour Software assists in the following scenarios:
• Operates in conjunction with radiation treatment planning systems or DICOM viewing systems to load, save, and display medical images and contours for treatment evaluation and treatment planning.
• Creation, transformation, and modification of contours for applications including, but not limited to: transferring contours to radiotherapy treatment planning systems, aiding adaptive therapy and archiving contours for patient follow-up.
• Localization and definition of healthy anatomical structures.
Limbus Contour is not intended for use with digital mammography.
Limbus Contour is not intended to automatically contour tumors or tumor clinical target volumes.
Indications for use as stated in the FDA summary.
https://510kreport.com/device/K201232 · printed Nov 6, 2026
Cite this page
510(k) Report. “K201232: Limbus Contour.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 6, 2026. https://510kreport.com/device/K201232
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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