510(k) · Cleared
ClearedMasimo O3 Regional Oximeter System
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Masimo Corporation · MUD Oximeter, Tissue Saturation
Cleared on Jun 9, 2016 as substantially equivalent to K133879 (Cas Medical Systems, Inc., 2014) after a 105-day review. Its family tree reaches back 13 generations to 1993. 5 later devices descend from it.
- Decided
- Jun 9, 2016
- Review
- 105 days
- Class
- Class II
- Product code
- MUD
- Recalls
- None
- Predicates
- 1
Its longest line of descent runs back 13 generations to K931154 (1993). 50 ancestors in all, the oldest K850978 (1985). 5 later devices descend from it, 2 citing it directly.
- Root · 13 generations backK931154 Evis 200 SystemOlympus Corp. · 1993
- 9 generations between
- 3 generations backK094030 Fore-Sight Absolute Cerebral and Somatic Oximeter, MC 2000 Series…Cas Medical Systems, Inc. · 2010
- 2 generations backK112820 Fore-Sight Absolute Tissue OximeterCas Medical Systems, Inc. · 2012
- 1 generation backK133879 Fore-Sight Elite Absolute Tissue OximeterCas Medical Systems, Inc. · 2014
- This deviceK160526 Masimo O3 Regional Oximeter SystemMasimo Corporation · 2016
- Descendant · cites it directly · 3 of its ownK182429 Masimo O3 Regional Oximeter SystemMasimo Corporation · 2019
- Descendant · 2 generations on · 2 of its ownK201432 Masimo O3 Regional Oximeter SystemMasimo Corporation · 2020
- Descendant · 3 generations on · 1 of its ownK214072 Masimo O3 Regional Oximeter SystemMasimo Corporation · 2022
- Descendant · 4 generations on · 0 of its ownK243324 Masimo O3 Regional OximeterMasimo Corporation · 2025
- Descendant · cites it directly · 0 of its ownK162603 Masimo O3 Regional Oximeter SystemMasimo Corporation · 2017
Show all 13 generations
- Root · 13 generations backK931154 Evis 200 SystemOlympus Corp. · 1993
- 12 generations backK963033 BF 240/P240/IT240 Bronchovideoscope & AccessoriesOlympus America, Inc. · 1996 · Recalled
- 11 generations backK981543 Olympus LF-TP and LF-DP Tracheal Intubation Fiberscopes, Accessories…The Olympus Optical Co. · 1998 · Recalled
- 10 generations backK002231 LF-DP Gastrointestinal and Sigmoid Fiberscope, Accessories and…Olympus Optical Co., Ltd. · 2001
- 9 generations backK011869 Xenf-DP Rhino-Laryngofiberscope, Its Accessories and Ancillary…The Olympus Optical Co. · 2001
- 8 generations backK040684 T-Stat Microvascular Tissue Oximeter, Model 303Spectros Corporation · 2004
- 7 generations backK051257 Adult Cerebral Oximeter, Model 2040Cas Medical Systems, Inc. · 2005
- 6 generations backK061960 Fore-Sight Cerebral Oximeter Monitor, Model 2040Cas Medical Systems, Inc. · 2006
- 5 generations backK083892 Fore-Sight, Model MC-2000 Series (MC-2000, MC-2010, MC2020, MC2030)Cas Medical Systems, Inc. · 2009
- 4 generations backK091452 Fore-Sight, Model MC-2000 Series (MC 2000, MC2010, MC-2020,MC2030)Cas Medical Systems, Inc. · 2009
- 3 generations backK094030 Fore-Sight Absolute Cerebral and Somatic Oximeter, MC 2000 Series…Cas Medical Systems, Inc. · 2010
- 2 generations backK112820 Fore-Sight Absolute Tissue OximeterCas Medical Systems, Inc. · 2012
- 1 generation backK133879 Fore-Sight Elite Absolute Tissue OximeterCas Medical Systems, Inc. · 2014
- This deviceK160526 Masimo O3 Regional Oximeter SystemMasimo Corporation · 2016
Most influential descendants
Showing 5 of 5 · See all- K182429Masimo O3 Regional Oximeter SystemMasimo Corporation · 2019 · cites it directly3descendants
- K201432Masimo O3 Regional Oximeter SystemMasimo Corporation · 2020 · 2 generations on2descendants
- K214072Masimo O3 Regional Oximeter SystemMasimo Corporation · 2022 · 3 generations on1descendant
- K243324Masimo O3 Regional OximeterMasimo Corporation · 2025 · 4 generations on0descendants
- K162603Masimo O3 Regional Oximeter SystemMasimo Corporation · 2017 · cites it directly0descendants
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| −13 | K931154 | Evis 200 System | Olympus Corp. | 1993 | — |
| −12 | K963033 | BF 240/P240/IT240 Bronchovideoscope & Accessories | Olympus America, Inc. | 1996 | 6 |
| −11 | K981543 | Olympus LF-TP and LF-DP Tracheal Intubation Fiberscopes, Accessories and… | The Olympus Optical Co. | 1998 | 5 |
| −10 | K002231 | LF-DP Gastrointestinal and Sigmoid Fiberscope, Accessories and Ancillary… | Olympus Optical Co., Ltd. | 2001 | — |
| −9 | K011869 | Xenf-DP Rhino-Laryngofiberscope, Its Accessories and Ancillary Equipment | The Olympus Optical Co. | 2001 | — |
| −8 | K040684 | T-Stat Microvascular Tissue Oximeter, Model 303 | Spectros Corporation | 2004 | — |
| −7 | K051257 | Adult Cerebral Oximeter, Model 2040 | Cas Medical Systems, Inc. | 2005 | — |
| −6 | K061960 | Fore-Sight Cerebral Oximeter Monitor, Model 2040 | Cas Medical Systems, Inc. | 2006 | — |
| −5 | K083892 | Fore-Sight, Model MC-2000 Series (MC-2000, MC-2010, MC2020, MC2030) | Cas Medical Systems, Inc. | 2009 | — |
| −4 | K091452 | Fore-Sight, Model MC-2000 Series (MC 2000, MC2010, MC-2020,MC2030) | Cas Medical Systems, Inc. | 2009 | — |
| −3 | K094030 | Fore-Sight Absolute Cerebral and Somatic Oximeter, MC 2000 Series, Models… | Cas Medical Systems, Inc. | 2010 | — |
| −2 | K112820 | Fore-Sight Absolute Tissue Oximeter | Cas Medical Systems, Inc. | 2012 | — |
| −1 | K133879 | Fore-Sight Elite Absolute Tissue Oximeter | Cas Medical Systems, Inc. | 2014 | — |
| 0 (this device) | K160526 | Masimo O3 Regional Oximeter System | Masimo Corporation | 2016 | — |
| +1 | K182429 | Masimo O3 Regional Oximeter System | Masimo Corporation | 2019 | — |
| +2 | K201432 | Masimo O3 Regional Oximeter System | Masimo Corporation | 2020 | — |
| +3 | K214072 | Masimo O3 Regional Oximeter System | Masimo Corporation | 2022 | — |
| +4 | K243324 | Masimo O3 Regional Oximeter | Masimo Corporation | 2025 | — |
| +1 | K162603 | Masimo O3 Regional Oximeter System | Masimo Corporation | 2017 | — |
Other ancestors by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1988 | 1 | 0 |
| 1990 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 3 | 0 |
| 2003 | 1 | 0 |
| 2004 | 2 | 0 |
| 2005 | 1 | 0 |
| 2006 | 2 | 0 |
| 2008 | 3 | 0 |
| 2009 | 3 | 0 |
| 2010 | 2 | 0 |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2017 | 1 | 0 |
| 2019 | 1 | 0 |
| 2020 | 1 | 0 |
| 2022 | 1 | 0 |
| 2025 | 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 MUD? 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 MUD device
- #1 K223651 Cerebral Adaptive Index (CAI) Algorithmscore 19.8 · 29 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 |
|---|---|---|---|
| * | K133879 | Fore-Sight Elite Absolute Tissue OximeterSummary page 4…t Class Establishment Registration 2031172 Number: Reason for Premarket New Device Notification: Predicate Devices: K133879 – Fore-Sight Elite Absolute Tissue Oximeter Performance Standards No performance standards for the above device have bee… | 2014 |
What descends from it? (5)
2 later devices cite it directly; ranked here by how many devices descend from each in turn.
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 23 years and passes through 7 companies; a new generation was cleared every 1.7 years on median.
- 8 of the 50 ancestors have a recall of any class.
- Of its descendants, K182429 (Masimo Corporation, 2019) has gone furthest, with 3 descendants of its own.
- 1 other device also cites its predicate K133879.
How does its category compare?
All MUD devicesMUD Oximeter, Tissue Saturation: FDA decisions, review times, recalls and adverse event reports over 20 years. 2016, this device’s year, is highlighted.
FDA decisions per year · MUD
2in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · MUD
124in 2024
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · MUD
1in 2023
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · MUD
131in 2025
MAUDE reports naming product code MUD, 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 | 0 | — | 0 | 0 |
| 2008 | 4 | 72 | 0 | 2 |
| 2009 | 4 | 96 | 1 | 7 |
| 2010 | 4 | 59 | 0 | 1 |
| 2011 | 2 | — | 0 | 2 |
| 2012 | 6 | 211 | 0 | 3 |
| 2013 | 2 | — | 0 | 8 |
| 2014 | 5 | 109 | 0 | 4 |
| 2015 | 3 | 107 | 0 | 0 |
| 2016 | 4 | 167 | 0 | 9 |
| 2017 | 3 | 249 | 0 | 24 |
| 2018 | 3 | 128 | 0 | 38 |
| 2019 | 7 | 88 | 0 | 107 |
| 2020 | 2 | — | 0 | 50 |
| 2021 | 2 | — | 0 | 27 |
| 2022 | 2 | — | 2 | 52 |
| 2023 | 2 | — | 1 | 73 |
| 2024 | 5 | 124 | 0 | 140 |
| 2025 | 2 | — | 0 | 131 |
| 2026 | 1 | — | 1 | — |
What is it indicated for?
The noninvasive Masimo O3 Regional Oximeter System and accessories are intended for use as an adjunct monitor of absolute and trended regional hemoglobin oxygen saturation of blood (rSO2) in the cerebral region under the sensors. The Masimo O3 Regional Oximeter System and accessories are indicated for use on adults ≥ 40 kg in healthcare environments.
Indications for use as stated in the FDA summary.
https://510kreport.com/device/K160526 · printed Nov 6, 2026
Cite this page
510(k) Report. “K160526: Masimo O3 Regional Oximeter System.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 6, 2026. https://510kreport.com/device/K160526
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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