510(k) · Cleared
ClearedTENS device-EmeTerm 2, Model: YF-ZTY-E2
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Wat Medical Technology, Inc. · GZJ Stimulator, Nerve, Transcutaneous, For Pain Relief
Cleared on Apr 23, 2022 as substantially equivalent to K172478 (Wat Medical Technology (Ningbo) Co., Ltd., 2018) after a 60-day review. Its family tree reaches back 6 generations to 1997.
- Decided
- Apr 23, 2022
- Review
- 60 days
- Class
- Class II
- Product code
- GZJ
- Recalls
- None
- Predicates
- 1
Its longest line of descent runs back 6 generations to K961050 (1997). 8 ancestors in all. No later device cites it as a predicate yet.
- Root · 6 generations backK961050 Reliefband Tens Unit (Modification)Maven Labs, Inc. · 1997
- 5 generations backK980333 ReliefbandWoodside Biomedical, Inc. · 1998
- 4 generations backK982436 Reliefband NST Device, Model #'S WB-2, WB-6 and WB-RWoodside Biomedical, Inc. · 1998
- 3 generations backK994387 Reliefband NST Device, Model WB-2L, WB-6L, WB-RLWoodside Biomedical, Inc. · 2000
- 2 generations backK020180 Reliefband Device, Models RB-DL, RB-EL, RB-RLWoodside Biomedical, Inc. · 2002
- 1 generation backK172478 TENS device-EmeTerm, CinvStopWat Medical Technology (Ningbo) Co., Ltd. · 2018
- This deviceK220503 TENS device-EmeTerm 2, Model: YF-ZTY-E2Wat Medical Technology, Inc. · 2022
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| −6 | K961050 | Reliefband Tens Unit (Modification) | Maven Labs, Inc. | 1997 | — |
| −5 | K980333 | Reliefband | Woodside Biomedical, Inc. | 1998 | — |
| −4 | K982436 | Reliefband NST Device, Model #'S WB-2, WB-6 and WB-R | Woodside Biomedical, Inc. | 1998 | — |
| −3 | K994387 | Reliefband NST Device, Model WB-2L, WB-6L, WB-RL | Woodside Biomedical, Inc. | 2000 | — |
| −2 | K020180 | Reliefband Device, Models RB-DL, RB-EL, RB-RL | Woodside Biomedical, Inc. | 2002 | — |
| −1 | K172478 | TENS device-EmeTerm, CinvStop | Wat Medical Technology (Ningbo) Co., Ltd. | 2018 | — |
| 0 (this device) | K220503 | TENS device-EmeTerm 2, Model: YF-ZTY-E2 | Wat Medical Technology, Inc. | 2022 | — |
Other ancestors by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 1999 | 2 | 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 GZJ? 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 GZJ device
- #1 K252767 actiTENS miniscore 13.1 · 9 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 |
|---|---|---|---|
| * | K172478 | TENS device-EmeTerm, CinvStopSummary page 4…lief Regulation Class: Class II Panel: Neurology Product Code: GZJ 3. Predicate Device 510(K) number: K172478 Device Name: TENS device-EmeTerm Manufacturer: YF-ZTY-E1 Common name Stimulato… | 2018 |
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 25 years and passes through 4 companies; a new generation was cleared every 2.0 years on median.
- None of the 8 ancestors has a recall.
How does its category compare?
All GZJ devicesGZJ Stimulator, Nerve, Transcutaneous, For Pain Relief: FDA decisions, review times, recalls and adverse event reports over 20 years. 2022, this device’s year, is highlighted.
FDA decisions per year · GZJ
1in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · GZJ
207in 2024
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · GZJ
1in 2011
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · GZJ
13in 2025
MAUDE reports naming product code GZJ, 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 | 13 | 223 | 4 | 4 |
| 2008 | 11 | 136 | 1 | 45 |
| 2009 | 16 | 155 | 0 | 17 |
| 2010 | 5 | 232 | 0 | 22 |
| 2011 | 5 | 168 | 1 | 22 |
| 2012 | 12 | 154 | 0 | 20 |
| 2013 | 2 | — | 0 | 10 |
| 2014 | 4 | 344 | 0 | 23 |
| 2015 | 3 | 202 | 0 | 18 |
| 2016 | 3 | 163 | 0 | 32 |
| 2017 | 3 | 113 | 0 | 58 |
| 2018 | 2 | — | 0 | 21 |
| 2019 | 3 | 156 | 0 | 7 |
| 2020 | 4 | 183 | 0 | 10 |
| 2021 | 3 | 231 | 0 | 5 |
| 2022 | 4 | 175 | 0 | 4 |
| 2023 | 1 | — | 0 | 39 |
| 2024 | 3 | 207 | 0 | 12 |
| 2025 | 1 | — | 0 | 13 |
| 2026 | 2 | — | 0 | — |
What is it indicated for?
TENS device-EmeTerm 2 is a wearable device for the treatment of nausea and vomiting caused by motion sickness and pregnancy.
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/K220503 · printed Nov 6, 2026
Cite this page
510(k) Report. “K220503: TENS device-EmeTerm 2, Model: YF-ZTY-E2.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 6, 2026. https://510kreport.com/device/K220503
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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