# K903633: Advance Laser Flowmeter, Alf 21

- Pathway: 510(k) (Traditional)
- Applicant: Transonic Systems, Inc.
- Decided: Oct 9, 1990 after 60 days
- Product code: DPW (Flowmeter, Blood, Cardiovascular)
- Device class: 2
- Regulation: 21 CFR 870.2100
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
No predicates in its family tree.
2 later devices descend from it; 2 cite it directly.
0 of 3 devices in its family (counting itself) have a Class I recall.

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

## Most influential descendants
- K140740: Transonic Tissue Perfusion Monitor (2015), 0 descendants of its own
- K013376: Qflow 500 Perfusion Monitoring System (2002), 0 descendants of its own

Source page: https://510kreport.com/device/K903633
Methodology: https://510kreport.com/methodology