510(k) · Cleared
ClearedPoseidon OCT Spinal Fixation System
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Medyssey USA, Inc. · NKG Posterior Cervical Screw System
Cleared on Jan 5, 2017 as substantially equivalent to K142838 (Synthes USA Products, LLC, 2015) and 1 other predicate after a 205-day review. Its family tree reaches back 3 generations to 1997.
- Decided
- Jan 5, 2017
- Review
- 205 days
- Class
- Class II
- Product code
- NKG
- Recalls
- None
- Predicates
- 2
Its longest line of descent runs back 3 generations to K953076 (1997). 5 ancestors in all. No later device cites it as a predicate yet.
- Root · 3 generations backK953076 Townley Facet/Pedicular Screw Plating SystemSofamor Danek USA,Inc. · 1997
- 2 generations backK062254 Axis Fixation SystemMedtronic Sofamor Danek, Inc. · 2008
- 1 generation backK142838 Synapse Occipital-Cervical-Thoracic (OCT) SystemSynthes USA Products, LLC · 2015 · Recalled
- This deviceK161637 Poseidon OCT Spinal Fixation SystemMedyssey USA, Inc. · 2017
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| −3 | K953076 | Townley Facet/Pedicular Screw Plating System | Sofamor Danek USA,Inc. | 1997 | — |
| −2 | K062254 | Axis Fixation System | Medtronic Sofamor Danek, Inc. | 2008 | — |
| −1 | K142838 | Synapse Occipital-Cervical-Thoracic (OCT) System | Synthes USA Products, LLC | 2015 | 1 |
| 0 (this device) | K161637 | Poseidon OCT Spinal Fixation System | Medyssey USA, Inc. | 2017 | — |
Other ancestors by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2002 | 1 | 0 |
| 2015 | 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 NKG? 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 NKG device
- #1 K252327 CMORE® CT System; CMORE® CT System Navigated…score 19.6 · 22 generations · no Class I recall
- #2 Held for the reportin the report
- #3 Held for the reportin the report
What was it cleared against? (2)
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 |
|---|---|---|---|
| * | K142838 | Synapse Occipital-Cervical-Thoracic (OCT) SystemSummary page 4…es these devices are substantially equivalent to a predicate device previously cleared by FDA. The primary predicate device is the Synapse OCT System from DePuy/Synthes (K142838). One additional predicate device is the Vertex Reconstruction System from Medtronic (K143471). Performance Standards: The pre-c… | 2015 |
| * | K143471 | VERTEX Reconstruction SystemSummary page 4…The primary predicate device is the Synapse OCT System from DePuy/Synthes (K142838). One additional predicate device is the Vertex Reconstruction System from Medtronic (K143471). Performance Standards: The pre-clinical testing was conducted per ASTM F2706 and ASTM F1798. Testing included: • Static an… | 2015 |
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 20 years and passes through 4 companies; a new generation was cleared every 6.6 years on median.
- 1 of the 5 ancestors has a recall of any class.
- 31 other devices also cite its predicate K142838.
How does its category compare?
All NKG devicesNKG Posterior Cervical Screw System: FDA decisions, review times, recalls and adverse event reports over 20 years. 2017, this device’s year, is highlighted.
FDA decisions per year · NKG
6in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · NKG
58in 2025
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · NKG
2in 2020
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · NKG
153in 2025
MAUDE reports naming product code NKG, 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 | 0 | — | 0 | 0 |
| 2009 | 0 | — | 0 | 0 |
| 2010 | 0 | — | 0 | 0 |
| 2011 | 0 | — | 0 | 0 |
| 2012 | 0 | — | 0 | 0 |
| 2013 | 0 | — | 0 | 0 |
| 2014 | 0 | — | 0 | 0 |
| 2015 | 17 | 71 | 0 | 4 |
| 2016 | 16 | 87 | 0 | 73 |
| 2017 | 15 | 108 | 0 | 99 |
| 2018 | 12 | 61 | 1 | 127 |
| 2019 | 8 | 50 | 1 | 214 |
| 2020 | 14 | 59 | 2 | 236 |
| 2021 | 7 | 56 | 0 | 704 |
| 2022 | 7 | 108 | 0 | 175 |
| 2023 | 10 | 58 | 0 | 131 |
| 2024 | 3 | 100 | 0 | 206 |
| 2025 | 6 | 58 | 0 | 153 |
| 2026 | 4 | 169 | 0 | — |
What is it indicated for?
The Poseidon OCT Spinal Fixation System is intended to provide immobilization and stabilization of spinal segments as an adjunct to fusion for the following acute and chronic instabilities of the craniocervical junction, the cervical spine (C1 to C7) and the thoracic spine (T1 to T3): traumatic spinal fractures and/or traumatic dislocations; instability or deformity; failed previous fusions (e.g., pseudoarthrosis); tumors involving the cervical/thoracic…
Read the full statement (175 words)
The Poseidon OCT Spinal Fixation System is intended to provide immobilization and stabilization of spinal segments as an adjunct to fusion for the following acute and chronic instabilities of the craniocervical junction, the cervical spine (C1 to C7) and the thoracic spine (T1 to T3): traumatic spinal fractures and/or traumatic dislocations; instability or deformity; failed previous fusions (e.g., pseudoarthrosis); tumors involving the cervical/thoracic spine; and degenerative disease, including intractable radiculopathy and/or myelopathy, neck and/or arm pain of discogenic origin as confirmed by radiographic studies, and degenerative disease of the facets with instability.
The Poseidon OCT Spinal Fixation System is also intended to restore the integrity of the spinal column even in the absence of fusion for a limited time period in patients with advanced stage tumors involving the cervical spine in whom life expectancy is of insufficient duration to permit achievement of fusion.
In order to achieve additional levels of fixation, the Poseidon OCT Spinal Fixation System may be connected to the Medyssey Zenius, Iliad or Kora Spinal Systems using parallel connectors and taper rods.
Indications for use as stated in the FDA summary.
https://510kreport.com/device/K161637 · printed Nov 6, 2026
Cite this page
510(k) Report. “K161637: Poseidon OCT Spinal Fixation System.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 6, 2026. https://510kreport.com/device/K161637
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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