# K033000: Next Generation Portable Therapeutic Liquid Oxygen System

- Pathway: 510(k) (Traditional)
- Applicant: Essex Cryogenics of Missouri, Inc.
- Decided: Mar 22, 2004 after 179 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
Longest line of descent: 1 generation back to K880183 (1988). 1 ancestor in all.
4 later devices descend from it; 3 cite it directly.
0 of 6 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- K880183: Portable Therapeutic Liquid Oxygen Unit, Essex Cryogenics of Missouri, Inc. (1988) Summary page 1.

## Most influential descendants
- K071581: Backpack Medical Oxygen System (2007), 1 descendant of its own
- K130068: Dismounted Medical & Supplemental Oxygen System (Dmos) (2013), 0 descendants of its own
- K113767: Mounted Medical Oxygen System (2012), 0 descendants of its own
- K101272: Mass Oxygen Distribution System (Mods) Model 10C-0061-3 (2010), 0 descendants of its own

## Indications for use
The NPTLOX is intended to convert liquid oxygen to gaseous oxygen (99.9% based on medical grade liquid oxygen) for delivery at 50 psig nominal for military use settings only.

Source page: https://510kreport.com/device/K033000
Methodology: https://510kreport.com/methodology