510(k) · Cleared
ClearedSOZO
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
ImpediMed Limited · OBH Monitor, Extracellular Fluid, Lymphedema, Extremity
Cleared on Aug 11, 2017 as substantially equivalent to K130338 (ImpediMed Limited, 2013) after a 29-day review. Its family tree reaches back 5 generations to 1991. 2 later devices descend from it.
- Decided
- Aug 11, 2017
- Review
- 29 days
- Class
- Class II
- Product code
- OBH
- Recalls
- None
- Predicates
- 1
Its longest line of descent runs back 5 generations to K904109 (1991). 7 ancestors in all. 2 later devices descend from it, 1 citing it directly.
- Root · 5 generations backK904109 Bio-Impedance AnalyzerXitron Technologies, Inc. · 1991
- 4 generations backK052319 Impedimed - Body Composition Analyzer, Model Imp SFB7Impedimed Pty, Ltd. · 2006
- 3 generations backK080825 Impedimed Extra Cellular Fluid Analysis, Model L-Dex U400Impedimed Pty, Ltd. · 2008
- 2 generations backK100811 Impedimed - Extracellular Fluid Analyzer Model: L-Dex U400ImpediMed Limited · 2011
- 1 generation backK130338 Impedimed - Bis Extra Cellular Fluid AnalysisImpediMed Limited · 2013
- This deviceK172122 SOZOImpediMed Limited · 2017
- Descendant · cites it directly · 1 of its ownK180126 SOZOImpediMed Limited · 2018 · Recalled
- Descendant · 2 generations on · 0 of its ownK230530 SOZO ProImpediMed Limited · 2023
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 |
|---|---|---|---|---|---|
| −5 | K904109 | Bio-Impedance Analyzer | Xitron Technologies, Inc. | 1991 | — |
| −4 | K052319 | Impedimed - Body Composition Analyzer, Model Imp SFB7 | Impedimed Pty, Ltd. | 2006 | — |
| −3 | K080825 | Impedimed Extra Cellular Fluid Analysis, Model L-Dex U400 | Impedimed Pty, Ltd. | 2008 | — |
| −2 | K100811 | Impedimed - Extracellular Fluid Analyzer Model: L-Dex U400 | ImpediMed Limited | 2011 | — |
| −1 | K130338 | Impedimed - Bis Extra Cellular Fluid Analysis | ImpediMed Limited | 2013 | — |
| 0 (this device) | K172122 | SOZO | ImpediMed Limited | 2017 | — |
| +1 | K180126 | SOZO | ImpediMed Limited | 2018 | 1 |
| +2 | K230530 | SOZO Pro | ImpediMed Limited | 2023 | — |
Other ancestors by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2001 | 1 | 0 |
| 2007 | 1 | 0 |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2018 | 1 | 0 |
| 2023 | 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 OBH? 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 OBH device
- #1 K253224 MySOZO Software version 6.0.1.2 (SW version…score 13.5 · 10 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 |
|---|---|---|---|
| * | K130338 | Impedimed - Bis Extra Cellular Fluid AnalysisSummary page 4…thysmograph Regulatory Class: 21 CFR 820.2770 Product Code: OBH Predicate Devices ImpediMed Limited’s L-Dex® U400 (K130338) Device Description The SOZO system consists of a connected hand and footplate with built-in stainless steel electrodes… | 2013 |
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 |
|---|---|---|---|
| K180126 | SOZO | 2018 | 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 26 years and passes through 3 companies; a new generation was cleared every 3.1 years on median.
- None of the 7 ancestors has a recall.
- Of its descendants, K180126 (ImpediMed Limited, 2018) has gone furthest, with 1 descendant of its own.
- 1 other device also cites its predicate K130338.
How does its category compare?
All OBH devicesOBH Monitor, Extracellular Fluid, Lymphedema, Extremity: FDA decisions, review times, recalls and adverse event reports over 20 years. 2017, this device’s year, is highlighted.
FDA decisions per year · OBH
1in 2023
2026 to Oct 25, outlined.
Median 510(k) review, days · OBH
Too few OBH 510(k)s in any year since 2007 to give a median.
Recalls per year · OBH
1in 2023
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · OBH
No MAUDE report names OBH since 2007.
View these four charts as a table
| Year | Decisions | Median 510(k) review, days | Recalls (Class I) | MAUDE reports |
|---|---|---|---|---|
| 2007 | 1 | — | 0 | 0 |
| 2008 | 1 | — | 0 | 0 |
| 2009 | 0 | — | 0 | 0 |
| 2010 | 0 | — | 0 | 0 |
| 2011 | 1 | — | 0 | 0 |
| 2012 | 0 | — | 0 | 0 |
| 2013 | 1 | — | 0 | 0 |
| 2014 | 0 | — | 0 | 0 |
| 2015 | 1 | — | 0 | 0 |
| 2016 | 0 | — | 0 | 0 |
| 2017 | 1 | — | 0 | 0 |
| 2018 | 1 | — | 0 | 0 |
| 2019 | 0 | — | 0 | 0 |
| 2020 | 0 | — | 0 | 0 |
| 2021 | 0 | — | 0 | 0 |
| 2022 | 1 | — | 0 | 0 |
| 2023 | 1 | — | 1 | 0 |
| 2024 | 0 | — | 0 | 0 |
| 2025 | 0 | — | 0 | 0 |
| 2026 | 1 | — | 0 | — |
What is it indicated for?
A bioimpedance spectroscopy device for use on adult human patients, utilizing impedance ratios that are displayed as an L-Dex ratio that supports the measurement of extracellular fluid volume differences between the limbs and is presented to the clinician on an L-Dex scale as an aid to their clinical assessment of unilateral lymphedema of the arm and leg in women and the leg in men. The device is only indicated for patients who will have or who have had…
Read the full statement (128 words)
A bioimpedance spectroscopy device for use on adult human patients, utilizing impedance ratios that are displayed as an L-Dex ratio that supports the measurement of extracellular fluid volume differences between the limbs and is presented to the clinician on an L-Dex scale as an aid to their clinical assessment of unilateral lymphedema of the arm and leg in women and the leg in men.
The device is only indicated for patients who will have or who have had lymph nodes, from the axillary and pelvic regions, either removed, damaged or irradiated.
SOZOhub PC software — a PC software package that is intended to be used only with the ImpediMed SOZO device for uploading data on to the PC from the SOZO device, processing and analyzing of bioimpedance measurements.
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/K172122 · printed Nov 4, 2026
Cite this page
510(k) Report. “K172122: SOZO.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 4, 2026. https://510kreport.com/device/K172122
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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