510(k) · Cleared
ClearedMacro-Micro Depth Electrode
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Ad-Tech Medical Instrument Corp · GZL Electrode, Depth
Cleared on Aug 16, 2004 as substantially equivalent to K891920 (Ad-Tech Medical Instrument Corp, 1989) and 2 other predicates after a 63-day review. Its family tree reaches back 4 generations to 1981. 12 later devices descend from it.
- Decided
- Aug 16, 2004
- Review
- 63 days
- Class
- Class II
- Product code
- GZL
- Recalls
- None
- Predicates
- 3
Its longest line of descent runs back 4 generations to K811452 (1981). 9 ancestors in all. 12 later devices descend from it, 2 citing it directly.
- Root · 4 generations backK811452 Brown-Roberts-Wells Stereotaxic SytemTrent Wells, Inc. · 1981
- 3 generations backK961858 Cosgrove Depth Electrode Kit (Cdek)Radionics, Inc. · 1996
- 2 generations backK991522 Microtargeting ElectrodeFHC, Inc. · 2000 · Recalled
- 1 generation backK033173 Micro Targeting ElectrodeFHC, Inc. · 2004
- This deviceK041604 Macro-Micro Depth ElectrodeAd-Tech Medical Instrument Corp · 2004
- Descendant · cites it directly · 11 of its ownK053358 Depth Electrode, Foramen Ovale Depth Electrodes, Wyler Sphenoidal…Ad-Tech Medical Instrument Corp · 2006
- Descendant · 2 generations on · 5 of its ownK170959 DIXI Medical Microdeep Depth ElectrodeDixi Medical · 2017 · Recalled
- Descendant · cites it directly · 5 of its ownK163355 Depth Electrodes, Foramen Ovale Depth Eletrodes, Marco-Micro Depth…Ad-Tech Medical Instrument Corporation · 2017 · Recalled
- Descendant · 3 generations on · 2 of its ownK211367 Evo sEEG SystemNeuroone Medical Technologies Corp. · 2021
- Descendant · 3 generations on · 1 of its ownK213170 SENSOSEEG Depth ElectrodesSensomedical Labs, Ltd. · 2023
Showing 5 of 12 descendants. See all descendants
Descendants cleared per year
Most influential descendants
Showing 5 of 12 · See all- K053358Depth Electrode, Foramen Ovale Depth Electrodes, Wyler Sphenoidal Depth ElectrodesAd-Tech Medical Instrument Corp · 2006 · cites it directly11descendants
- K170959DIXI Medical Microdeep Depth ElectrodeDixi Medical · 2017 · 2 generations on5descendants
- K163355Depth Electrodes, Foramen Ovale Depth Eletrodes, Marco-Micro Depth Electrodes, Spencer…Ad-Tech Medical Instrument Corporation · 2017 · cites it directly5descendants
- K211367Evo sEEG SystemNeuroone Medical Technologies Corp. · 2021 · 3 generations on2descendants
- K213170SENSOSEEG Depth ElectrodesSensomedical Labs, Ltd. · 2023 · 3 generations on1descendant
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| −4 | K811452 | Brown-Roberts-Wells Stereotaxic Sytem | Trent Wells, Inc. | 1981 | — |
| −3 | K961858 | Cosgrove Depth Electrode Kit (Cdek) | Radionics, Inc. | 1996 | — |
| −2 | K991522 | Microtargeting Electrode | FHC, Inc. | 2000 | 3 |
| −1 | K033173 | Micro Targeting Electrode | FHC, Inc. | 2004 | — |
| 0 (this device) | K041604 | Macro-Micro Depth Electrode | Ad-Tech Medical Instrument Corp | 2004 | — |
| +1 | K053358 | Depth Electrode, Foramen Ovale Depth Electrodes, Wyler Sphenoidal Depth… | Ad-Tech Medical Instrument Corp | 2006 | — |
| +2 | K170959 | DIXI Medical Microdeep Depth Electrode | Dixi Medical | 2017 | 9 |
| +1 | K163355 | Depth Electrodes, Foramen Ovale Depth Eletrodes, Marco-Micro Depth Electrodes… | Ad-Tech Medical Instrument Corporation | 2017 | 5 |
| +3 | K211367 | Evo sEEG System | Neuroone Medical Technologies Corp. | 2021 | — |
| +3 | K213170 | SENSOSEEG Depth Electrodes | Sensomedical Labs, Ltd. | 2023 | — |
Other ancestors by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 1989 | 1 | 0 |
| 1995 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2006 | 1 | 0 |
| 2017 | 2 | 0 |
| 2021 | 3 | 0 |
| 2022 | 2 | 0 |
| 2023 | 2 | 0 |
| 2025 | 1 | 0 |
| 2026 | 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 GZL? 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 GZL device
- #1 K253970 Wovyn Depth Electrodescore 13.3 · 8 generations · no Class I recall
- #2 Held for the reportin the report
- #3 Held for the reportin the report
What was it cleared against? (3)
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 |
|---|---|---|---|
| * | K891920 | AD-Tech's Depth ElectrodeSummary page 1…Depth Electrodes Classification Name: 2 1 CFR 882.1330, Depth Electrode Predicate Device(s): 510(k) Number: K89 1920, K964644 Manufacture: AD-TECH Medical Instrument Corporation… | 1989 |
| * | K964644 | AD-Tech's Depth ElectrodeSummary page 1…Depth Electrodes Classification Name: 2 1 CFR 882.1330, Depth Electrode Predicate Device(s): 510(k) Number: K89 1920, K964644 Manufacture: AD-TECH Medical Instrument Corporation Tr… | 1997 |
| * | K033173 | Micro Targeting ElectrodeSummary page 1…Trade Name: Depth Electrode Product Code: GZL 5 10(k) Number: K033 173 ManuifactUre: Fhic, Inc. Trade Name: Micro Targeti… | 2004 |
What descends from it? (12)
See all 122 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 4 companies; a new generation was cleared every 4.0 years on median.
- 2 of the 9 ancestors have a recall of any class.
- Of its descendants, K053358 (Ad-Tech Medical Instrument Corp, 2006) has gone furthest, with 11 descendants of its own.
- 2 other devices also cite its predicate K891920.
How does its category compare?
All GZL devicesGZL Electrode, Depth: FDA decisions, review times, recalls and adverse event reports over 20 years.
FDA decisions per year · GZL
2in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · GZL
206in 2023
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · GZL
3in 2024
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · GZL
12in 2025
MAUDE reports naming product code GZL, 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 | 3 | 166 | 0 | 0 |
| 2008 | 0 | — | 3 | 8 |
| 2009 | 1 | — | 2 | 5 |
| 2010 | 0 | — | 0 | 6 |
| 2011 | 1 | — | 0 | 4 |
| 2012 | 1 | — | 0 | 8 |
| 2013 | 1 | — | 0 | 25 |
| 2014 | 1 | — | 1 | 7 |
| 2015 | 0 | — | 0 | 14 |
| 2016 | 2 | — | 0 | 9 |
| 2017 | 4 | 222 | 0 | 3 |
| 2018 | 3 | 58 | 0 | 2 |
| 2019 | 0 | — | 0 | 13 |
| 2020 | 1 | — | 0 | 24 |
| 2021 | 3 | 262 | 9 | 13 |
| 2022 | 3 | 90 | 0 | 10 |
| 2023 | 3 | 206 | 0 | 30 |
| 2024 | 0 | — | 3 | 16 |
| 2025 | 2 | — | 0 | 12 |
| 2026 | 1 | — | 0 | — |
What is it indicated for?
The Macro-Micro Depth Electrodes are intended for use with recording, monitoring and stimulation equipment for the recording, monitoring and stimulation of electrical signals at the subsurface level of the brain.
Indications for use as stated in the FDA summary.
https://510kreport.com/device/K041604 · printed Nov 5, 2026
Cite this page
510(k) Report. “K041604: Macro-Micro Depth Electrode.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 5, 2026. https://510kreport.com/device/K041604
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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