510(k) · Decided
DecidedLangham Ocular Blood Flow (Obf) Tonograph/Tonometer Model 201
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Langham Ophthalmic Technologies · HKX Tonometer, Ac-Powered
Cleared on Jun 27, 2001 after an 85-day review. FDA’s file for it is a 510(k) statement, which names no predicate. 2 later devices descend from it.
- Decided
- Jun 27, 2001
- Review
- 85 days
- Class
- Class II
- Product code
- HKX
- Recalls
- None
- Predicates
- 0
2 later devices descend from it, 1 citing it directly.
- This deviceK010998 Langham Ocular Blood Flow (Obf) Tonograph/Tonometer Model 201Langham Ophthalmic Technologies · 2001
- Descendant · cites it directly · 1 of its ownK071755 Falck Applanation Tonometer (FAT2)Falck Medical, Inc. · 2008
- Descendant · 2 generations on · 0 of its ownK151491 Falck Medical Multifunction Tonometer, FAT1Falck Medical, Inc. · 2016
Most influential descendants
Showing 2 of 2 · See allView FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| 0 (this device) | K010998 | Langham Ocular Blood Flow (Obf) Tonograph/Tonometer Model 201 | Langham Ophthalmic Technologies | 2001 | — |
| +1 | K071755 | Falck Applanation Tonometer (FAT2) | Falck Medical, Inc. | 2008 | — |
| +2 | K151491 | Falck Medical Multifunction Tonometer, FAT1 | Falck Medical, Inc. | 2016 | — |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2008 | 1 | 0 |
| 2016 | 1 | 0 |
Sources: FDA 510(k) database (decision fields), the FDA 510(k) statement (indications), FDA recall and enforcement reports, and MAUDE; processed by 510(k) Report. Verify on FDA.gov · Methodology and accuracy.
Planning a device in HKX? 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 HKX device
- #1 K253039 Auto Kerato-Refracto Tonometer TRK-3 Omniascore 11.5 · 5 generations · no Class I recall
- #2 Held for the reportin the report
What was it cleared against?
FDA’s file for it is a 510(k) statement, which names no predicate.
What descends from it? (2)
1 later device cites it directly; ranked here by how many devices descend from each in turn.
| Number | Device | Decided | Descendants |
|---|---|---|---|
| K071755 | Falck Applanation Tonometer (FAT2) | 2008 | 1 |
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?
- Of its descendants, K071755 (Falck Medical, Inc., 2008) has gone furthest, with 1 descendant of its own.
How does its category compare?
All HKX devicesHKX Tonometer, Ac-Powered: FDA decisions, review times, recalls and adverse event reports over 20 years.
FDA decisions per year · HKX
1in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · HKX
290in 2019
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · HKX
No recall names HKX since 2007.
Adverse event reports per year · HKX
1in 2015
MAUDE reports naming product code HKX, 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 | 0 | — | 0 | 0 |
| 2008 | 2 | — | 0 | 1 |
| 2009 | 1 | — | 0 | 0 |
| 2010 | 1 | — | 0 | 1 |
| 2011 | 1 | — | 0 | 0 |
| 2012 | 1 | — | 0 | 0 |
| 2013 | 0 | — | 0 | 0 |
| 2014 | 0 | — | 0 | 0 |
| 2015 | 1 | — | 0 | 1 |
| 2016 | 0 | — | 0 | 0 |
| 2017 | 1 | — | 0 | 0 |
| 2018 | 1 | — | 0 | 0 |
| 2019 | 3 | 290 | 0 | 0 |
| 2020 | 0 | — | 0 | 0 |
| 2021 | 0 | — | 0 | 0 |
| 2022 | 0 | — | 0 | 0 |
| 2023 | 1 | — | 0 | 0 |
| 2024 | 0 | — | 0 | 0 |
| 2025 | 1 | — | 0 | 0 |
| 2026 | 0 | — | 0 | — |
What is it indicated for?
The Langham Ocular Blood Flow (OBF) Mqdel 201 measures the intraocular
pressure and the pulse amplitude.
Indications for use read by OCR from a scanned FDA 510(k) statement, so letters may be misread. Check the PDF before quoting it.
https://510kreport.com/device/K010998 · printed Nov 6, 2026
Cite this page
510(k) Report. “K010998: Langham Ocular Blood Flow (Obf) Tonograph/Tonometer Model 201.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 6, 2026. https://510kreport.com/device/K010998
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Record history
- FDA decision record loaded May 2, 2026
- Summary read Oct 30, 2026 (extraction version 2d9447fa9ea4)
- Lineage and recalls computed Nov 3, 2026
- Page last updated Nov 3, 2026