# K000501: Electrosurgical Generator, Model S1

- Pathway: 510(k) (Traditional)
- Applicant: Somnus Medical Technologies, Inc.
- Decided: Mar 17, 2000 after 31 days
- Product code: GEI (Electrosurgical, Cutting & Coagulation & Accessories)
- Device class: 2
- Regulation: 21 CFR 878.4400
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
No predicates in its family tree.
171 later devices descend from it; 2 cite it directly.
0 of 172 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
- K011722: Atricure Bipolar Coagulation System (2001), 92 descendants of its own
- K020919: Atricure Bipolar System, Models ASU1, ASU2, ASU3, LHP1, LHP2, RHP1 (2002), 90 descendants of its own
- K020067: Gyrus Ent Somnoplasty Generator (2002), 77 descendants of its own
- K021777: Gyrus Ent Cogent 2/G2 System (Generator,Accessories Somnoplasty Electrodes and Plasmacision Electrodes) (2002), 76 descendants of its own
- K034004: Diego RF Powered Dissector and Drill System Console (2004), 50 descendants of its own

Source page: https://510kreport.com/device/K000501
Methodology: https://510kreport.com/methodology