# K891920: AD-Tech's Depth Electrode

- Pathway: 510(k) (Traditional)
- Applicant: Ad-Tech Medical Instrument Corp
- Decided: Jul 27, 1989 after 122 days
- Product code: GZL (Electrode, Depth)
- Device class: 2
- Regulation: 21 CFR 882.1330
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
No predicates in its family tree.
14 later devices descend from it; 3 cite it directly.
0 of 15 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- None. FDA has not posted a summary or statement for it, so its predicates are not known.

## Most influential descendants
- K041604: Macro-Micro Depth Electrode (2004), 12 descendants of its own
- K990788: AD-Tech's Foramen Ovale Electrode (1999), 12 descendants of its own
- K053358: Depth Electrode, Foramen Ovale Depth Electrodes, Wyler Sphenoidal Depth Electrodes (2006), 11 descendants of its own
- K170959: DIXI Medical Microdeep Depth Electrode (2017), 5 descendants of its own
- K163355: Depth Electrodes, Foramen Ovale Depth Eletrodes, Marco-Micro Depth Electrodes, Spencer Probe Depth Electrodes (2017), 5 descendants of its own

Source page: https://510kreport.com/device/K891920
Methodology: https://510kreport.com/methodology