# K020876: Echoscan, Model US-1800

- Pathway: 510(k) (Special)
- Applicant: Nidek, Inc.
- Decided: May 3, 2002 after 46 days
- Product code: IYO (System, Imaging, Pulsed Echo, Ultrasonic)
- Device class: 2
- Regulation: 21 CFR 892.1560
- 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 K903326 (1990). 1 ancestor in all.
2 later devices descend from it; 2 cite it directly.
0 of 4 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- K903326: Nidek US-2000, Nidek, Inc. (1990) Summary page 1.

## Most influential descendants
- K133132: Optical Biometer AL-Scan (2014), 0 descendants of its own
- K042099: Tonopach Ultrasonic Tonometer/Pachymeter Model P-201 (the Tonopach) (2004), 0 descendants of its own

## Indications for use
The Nidek ECHOSCAN Model US-1800 is a diagnostic instrument that is intended for use in the measurement of the axial length of the eye and corneal thickness.

Source page: https://510kreport.com/device/K020876
Methodology: https://510kreport.com/methodology