# K190783: Health Expert Electronic Stimulator (model: AST-300L)

- Pathway: 510(k) (Traditional)
- Applicant: Shenzhen Osto Technology Company Limited
- Decided: Mar 14, 2020 after 353 days
- Product code: NUH (Stimulator, Nerve, Transcutaneous, Over-The-Counter)
- Device class: 2
- Regulation: 21 CFR 882.5890
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
Longest line of descent: 7 generations back to K940301 (1994). 15 ancestors in all.
6 later devices descend from it; 5 cite it directly.
0 of 22 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- K133929: Health Expert Elctronic Stimulator, Shenzhen Osto Technology Company Limited (2014) Summary page 5.
- K160115: Heat Pain Pro, Omron Healthcare, Inc. (2016) Summary page 5.

## Most influential descendants
- K211942: Heating Lumbar Therapy Cushion (Model: AST-622, AST-622B, AST-623, AST-623B) (2021), 1 descendant of its own
- K210756: Neck Care Therapy, Model: AST-905A, AST-905D, AST-905H (2021), 1 descendant of its own
- K223428: Electronic Stimulator (Models: uLumb-9530A, uLumb-9531A, uLumb-9532A, uLumb-9533A, LQ-9525B, uNeck-9512A, uNeck-9515A, uNeck-9517B, uNeck-9518A, uNeck-9519A, uNeck-9521A, uNeck-9529A, LQ-9535A) (2023), 0 descendants of its own
- K221092: Transcutaneous Electrical Nerve Stimulator Model: ST-304 (2022), 0 descendants of its own
- K221251: Ems Foot Stimulator (model: HK701, HK701A, HK701B, HK701C) (2022), 0 descendants of its own

## Indications for use
PMS (Mode 1~8) It is intended to stimulate healthy muscles in order to improve and facilitate muscle performance. TENS (Mode 9~25) To be used for temporary relief of pain associated with sore and aching muscles in the shoulder, waist, back, back of the neck, arm, leg, and foot due to strain from exercise or normal household work activities by applying current to stimulate nerve.

Source page: https://510kreport.com/device/K190783
Methodology: https://510kreport.com/methodology