# K842223: J4 Myo-Monitor

- Pathway: 510(k) (Traditional)
- Applicant: Myo-Tronics Research, Inc.
- Decided: Nov 19, 1984 after 167 days
- Product code: NUW (Stimulator, Muscle, Powered, Dental)
- Device class: 2
- Regulation: 21 CFR 890.5850
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
No predicates in its family tree.
8 later devices descend from it; 2 cite it directly.
0 of 9 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
- K031998: Model J-5 Mvo-Monitor (2003), 7 descendants of its own
- K092675: Grindcare (2010), 2 descendants of its own
- K203525: D function (2021), 1 descendant of its own
- K243290: BTL-785MJ (2025), 0 descendants of its own
- K163448: GrindCare System (2017), 0 descendants of its own

Source page: https://510kreport.com/device/K842223
Methodology: https://510kreport.com/methodology