# K954492: Mercury Medical Expiratory Resistance Exerciser, Resistex

- Pathway: 510(k) (Traditional)
- Applicant: Mercury Medical
- Decided: Oct 21, 1996 after 390 days
- Product code: BWF (Spirometer, Therapeutic (Incentive))
- Device class: 2
- Regulation: 21 CFR 868.5690
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
No predicates in its family tree.
9 later devices descend from it; 2 cite it directly.
0 of 10 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- None. The FDA summary names its predicate without a number.
- (no number) Circulaire™ Aerosol Drug Delivery System: named in the summary without a submission number

## Most influential descendants
- K983467: Therapep (1999), 7 descendants of its own
- K991561: Roadrunner, Pep Therapy Device (1999), 5 descendants of its own
- K140772: Aerosure Medic (2014), 1 descendant of its own
- K233855: AllPEP (2024), 0 descendants of its own
- K203378: Pulsehaler (2021), 0 descendants of its own

## Indications for use
PERMITS RESISTANCE BREATHING DURING AEROSOL TREATMENT

Source page: https://510kreport.com/device/K954492
Methodology: https://510kreport.com/methodology