# K933930: Puritan-Bennett Companion 550 Liquid Oxygen Portable Unit

- Pathway: 510(k) (Traditional)
- Applicant: Puritan Bennett Corp.
- Decided: Mar 21, 1994 after 222 days
- Product code: BYJ (Unit, Liquid-Oxygen, Portable)
- Device class: 2
- Regulation: 21 CFR 868.5655
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
No predicates in its family tree.
79 later devices descend from it; 1 cites it directly.
19 of 80 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
- K993220: Puritan-Bennett Helios Portable Liquid Oxygen System (1999), 78 descendants of its own
- K041122: Precision Liquid Oxygen System (2004), 65 descendants of its own
- K062710: GE Datex-Ohmeda Engstrom Carestation (2006), 47 descendants of its own
- K081842: Engstrom Carestation, Engstrom Pro (2008), 37 descendants of its own
- K093886: Engstrom Carestation, Engstrom Pro (2010), 21 descendants of its own

Source page: https://510kreport.com/device/K933930
Methodology: https://510kreport.com/methodology