# K173904: CATS Tonometer Prism

- Pathway: 510(k) (Traditional)
- Applicant: Cats Tonometer, LLC
- Decided: Mar 9, 2018 after 77 days
- Product code: HKY (Tonometer, Manual)
- Device class: 2
- Regulation: 21 CFR 886.1930
- 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 K981432 (1999). 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)
- K981432: Goldman Manual Tonometer, Golden Vision, Inc. (1999) Summary page 4.

## Most influential descendants
- K234037: CATS-L Tonometer™ Prism (2024), 0 descendants of its own
- K203850: CATS®-D Tonometer Prism (2021), 0 descendants of its own

## Indications for use
The CATS Tonometer™ Prism is intended to be used with Goldmann type tonometers for the measurement of intraocular pressure.

Source page: https://510kreport.com/device/K173904
Methodology: https://510kreport.com/methodology