510(k) · Cleared
ClearedCATS®-D Tonometer Prism
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Cats Tonometer, LLC · HKY Tonometer, Manual
Cleared on Jun 14, 2021 as substantially equivalent to K173904 (Cats Tonometer, LLC, 2018) after a 165-day review. Its family tree reaches back 2 generations to 1999.
- Decided
- Jun 14, 2021
- Review
- 165 days
- Class
- Class II
- Product code
- HKY
- Recalls
- None
- Predicates
- 1
Its longest line of descent runs back 2 generations to K981432 (1999). No later device cites it as a predicate yet.
View FIG. 1 as a table
Line of descent and top descendants
Sources: FDA 510(k) database (decision fields), the FDA summary (predicates and indications), FDA recall and enforcement reports, and MAUDE; processed by 510(k) Report. Verify on FDA.gov · Methodology and accuracy.
Planning a device in HKY? A 510(k) Report weighs predicate choices, recall history and review times for a new device like this one.
Top candidate predicates for a new HKY device
- #1 K241447 iCare ST500 (TA04)score 9.6 · 6 generations · no Class I recall
- #2 Held for the reportin the report
- #3 Held for the reportin the report
What was it cleared against? (1)
Devices the submitter claimed this one is substantially equivalent to (*), and reference devices cited for a specific test or feature (†), as written in the FDA summary.
| Type | Number | Device | Decided |
|---|---|---|---|
| * | K173904 | CATS Tonometer PrismSummary page 4…es: The CATS®-D Tonometer Prism is substantially equivalent in terms of intended use and technological characteristics to the CATS® Reusable Tonometer prism (K173904). 5.6 Device Description: The CATS®-D Tonometer Prism is used as an optical image prism for Goldmann applanation s… | 2018 |
What descends from it?
No later submission names this one as a predicate yet.
Has anything in its family been recalled? (0 Class I)
No FDA recall names this device.
No ancestor or descendant has a Class I recall.
What does this lineage say?
- The line of descent spans 22 years and passes through 2 companies; a new generation was cleared every 19.2 years on median.
- None of the 2 ancestors has a recall.
- 1 other device also cites its predicate K173904.
How does its category compare?
All HKY devicesHKY Tonometer, Manual: FDA decisions, review times, recalls and adverse event reports over 20 years. 2021, this device’s year, is highlighted.
FDA decisions per year · HKY
3in 2024
2026 to Oct 25, outlined.
Median 510(k) review, days · HKY
128in 2024
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · HKY
2in 2014
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · HKY
1in 2019
MAUDE reports naming product code HKY, not matched to any one device; reports are not rates.
View these four charts as a table
| Year | Decisions | Median 510(k) review, days | Recalls (Class I) | MAUDE reports |
|---|---|---|---|---|
| 2007 | 2 | — | 0 | 0 |
| 2008 | 1 | — | 0 | 0 |
| 2009 | 0 | — | 0 | 0 |
| 2010 | 1 | — | 0 | 2 |
| 2011 | 0 | — | 0 | 0 |
| 2012 | 0 | — | 0 | 0 |
| 2013 | 1 | — | 0 | 1 |
| 2014 | 3 | 123 | 2 | 3 |
| 2015 | 2 | — | 0 | 1 |
| 2016 | 3 | 226 | 0 | 2 |
| 2017 | 2 | — | 0 | 0 |
| 2018 | 3 | 77 | 0 | 0 |
| 2019 | 1 | — | 0 | 1 |
| 2020 | 2 | — | 0 | 0 |
| 2021 | 1 | — | 0 | 0 |
| 2022 | 2 | — | 0 | 0 |
| 2023 | 1 | — | 0 | 0 |
| 2024 | 3 | 128 | 0 | 0 |
| 2025 | 0 | — | 0 | 0 |
| 2026 | 0 | — | 0 | — |
What is it indicated for?
The CATS®-D Tonometer Prism is intended to be used with Goldmann type tonometers for the measurement of intraocular pressure of the human eye.
Indications for use as stated in the FDA summary.
https://510kreport.com/device/K203850 · printed Nov 6, 2026
Cite this page
510(k) Report. “K203850: CATS®-D Tonometer Prism.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 6, 2026. https://510kreport.com/device/K203850
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Record history
- FDA decision record loaded May 2, 2026
- Summary read Oct 13, 2026 (extraction version 9eaa42aa01ed)
- Lineage and recalls computed Nov 3, 2026
- Page last updated Nov 3, 2026