# K923402: Crystal Trace Piezo Respiratory Effort Sensor

- Pathway: 510(k) (Traditional)
- Applicant: Pro-Tech, Inc.
- Decided: Dec 30, 1992 after 173 days
- Product code: BZQ (Monitor, Breathing Frequency)
- Device class: 2
- Regulation: 21 CFR 868.2375
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
No predicates in its family tree.
205 later devices descend from it; 5 cite it directly.
0 of 206 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- None. FDA lists a 510(k) statement for it but has not posted the file, so its predicates are not known.

## Most influential descendants
- K040605: Dymedix Reusable Respiratory Effort Belt Sensor, Model 6015 and Dymedix Reusable Limb Movement Sensor, Model 3100 (2004), 100 descendants of its own
- K061993: Equivital, Model EQ-01 (2006), 99 descendants of its own
- K020607: Sleepflo, Model 101501 (2002), 99 descendants of its own
- K030379: Aplab, Model 801D0030 (2003), 98 descendants of its own
- K113054: Equivital (2012), 71 descendants of its own

Source page: https://510kreport.com/device/K923402
Methodology: https://510kreport.com/methodology