510(k) · Cleared
ClearedHC604 Cpap Humidifier
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Fisher & Paykel Healthcare, Ltd. · BZD Ventilator, Non-Continuous (Respirator)
Cleared on Aug 31, 2004 as substantially equivalent to K040941 (Fisher & Paykel Healthcare, Ltd., 2004) after a 48-day review. Its family tree reaches back 4 generations to 1995. 74 later devices descend from it.
- Decided
- Aug 31, 2004
- Review
- 48 days
- Class
- Class II
- Product code
- BZD
- Recalls
- None
- Predicates
- 1
Its longest line of descent runs back 4 generations to K952292 (1995). 7 ancestors in all, the oldest K915460 (1993). 74 later devices descend from it, 4 citing it directly.
- Root · 4 generations backK952292 Puritan-Bennett Companion Nasal Cpap SystemPuritan Bennett Corp. · 1995
- 3 generations backK961626 Solo Cpap SystemRespironics, Inc. · 1996
- 2 generations backK973161 Cpap Humidifier (HC 200)Fisher & Paykel Electronics, Ltd. · 1998
- 1 generation backK040941 Cpap Humidifier, Model HC234 (and Related Accessories)Fisher & Paykel Healthcare, Ltd. · 2004
- This deviceK041900 HC604 Cpap HumidifierFisher & Paykel Healthcare, Ltd. · 2004
- Descendant · cites it directly · 33 of its ownK082605 Vpap Auto with Humidaire 3IResmed, Ltd. · 2009
- Descendant · 2 generations on · 31 of its ownK091947 S8 Aspen with H4I PlusResmed, Ltd. · 2009
- Descendant · cites it directly · 30 of its ownK092846 Airvo Series HumidifiersFisher & Paykel Healthcare, Ltd. · 2010
- Descendant · 2 generations on · 25 of its ownK121975 Airvo Humidifier Myairo HumidifierFisher & Paykel Healthcare, Ltd. · 2013
- Descendant · 3 generations on · 24 of its ownK131895 Airvo 2 Humidifier, Myairvo 2 HumidifierFisher & Paykel Healthcare, Ltd. · 2013 · Recalled
Showing 5 of 74 descendants. See all descendants
Descendants cleared per year
Most influential descendants
Showing 5 of 74 · See all- K082605Vpap Auto with Humidaire 3IResmed, Ltd. · 2009 · cites it directly33descendants
- K091947S8 Aspen with H4I PlusResmed, Ltd. · 2009 · 2 generations on31descendants
- K092846Airvo Series HumidifiersFisher & Paykel Healthcare, Ltd. · 2010 · cites it directly30descendants
- K121975Airvo Humidifier Myairo HumidifierFisher & Paykel Healthcare, Ltd. · 2013 · 2 generations on25descendants
- K131895Airvo 2 Humidifier, Myairvo 2 HumidifierFisher & Paykel Healthcare, Ltd. · 2013 · 3 generations on24descendants
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| −4 | K952292 | Puritan-Bennett Companion Nasal Cpap System | Puritan Bennett Corp. | 1995 | — |
| −3 | K961626 | Solo Cpap System | Respironics, Inc. | 1996 | — |
| −2 | K973161 | Cpap Humidifier (HC 200) | Fisher & Paykel Electronics, Ltd. | 1998 | — |
| −1 | K040941 | Cpap Humidifier, Model HC234 (and Related Accessories) | Fisher & Paykel Healthcare, Ltd. | 2004 | — |
| 0 (this device) | K041900 | HC604 Cpap Humidifier | Fisher & Paykel Healthcare, Ltd. | 2004 | — |
| +1 | K082605 | Vpap Auto with Humidaire 3I | Resmed, Ltd. | 2009 | — |
| +2 | K091947 | S8 Aspen with H4I Plus | Resmed, Ltd. | 2009 | — |
| +1 | K092846 | Airvo Series Humidifiers | Fisher & Paykel Healthcare, Ltd. | 2010 | — |
| +2 | K121975 | Airvo Humidifier Myairo Humidifier | Fisher & Paykel Healthcare, Ltd. | 2013 | — |
| +3 | K131895 | Airvo 2 Humidifier, Myairvo 2 Humidifier | Fisher & Paykel Healthcare, Ltd. | 2013 | 2 |
Other ancestors by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1996 | 1 | 0 |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2009 | 2 | 0 |
| 2010 | 3 | 0 |
| 2011 | 5 | 0 |
| 2012 | 5 | 0 |
| 2013 | 5 | 0 |
| 2014 | 7 | 0 |
| 2016 | 4 | 0 |
| 2017 | 1 | 0 |
| 2018 | 3 | 0 |
| 2019 | 1 | 0 |
| 2020 | 4 | 0 |
| 2021 | 4 | 0 |
| 2022 | 4 | 0 |
| 2023 | 5 | 0 |
| 2024 | 10 | 0 |
| 2025 | 7 | 0 |
| 2026 | 4 | 0 |
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 BZD? 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 BZD device
- #1 K250624 myAirscore 15.7 · 12 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 |
|---|---|---|---|
| * | K040941 | Cpap Humidifier, Model HC234 (and Related Accessories)Summary page 1…Anesthesiology Devices, 21 CFR §868.5905 (Class 1I) Predicate Devices: Fisher & Paykel Healthcare, HC234 CPAP Humidifier, K(040941 This summary of 510(k) safety and effectiveness in formation is being submitted in accordance with the requirements of 21 CER §8… | 2004 |
What descends from it? (74)
See all 744 later devices cite it directly; ranked here by how many devices descend from each in turn.
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 9 years and passes through 4 companies; a new generation was cleared every 2.0 years on median.
- None of the 7 ancestors has a recall.
- Of its descendants, K082605 (Resmed, Ltd., 2009) has gone furthest, with 33 descendants of its own.
- 3 other devices also cite its predicate K040941.
How does its category compare?
All BZD devicesBZD Ventilator, Non-Continuous (Respirator): FDA decisions, review times, recalls and adverse event reports over 20 years.
FDA decisions per year · BZD
7in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · BZD
189in 2025
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · BZD
8in 2023
Class I (13 since 2007) Class II/III not classified
Adverse event reports per year · BZD
60,279in 2025
MAUDE reports naming product code BZD, 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 | 21 | 83 | 29 | 65 |
| 2008 | 17 | 108 | 2 | 67 |
| 2009 | 23 | 90 | 1 | 147 |
| 2010 | 12 | 122 | 0 | 143 |
| 2011 | 23 | 125 | 1 | 189 |
| 2012 | 21 | 133 | 0 | 139 |
| 2013 | 23 | 127 | 0 | 82 |
| 2014 | 14 | 172 | 0 | 86 |
| 2015 | 11 | 224 | 0 | 114 |
| 2016 | 12 | 217 | 0 | 118 |
| 2017 | 5 | 221 | 0 | 148 |
| 2018 | 5 | 280 | 0 | 101 |
| 2019 | 6 | 231 | 4 (4) | 188 |
| 2020 | 6 | 137 | 0 | 126 |
| 2021 | 6 | 192 | 0 | 6,066 |
| 2022 | 4 | 253 | 0 | 90,768 |
| 2023 | 5 | 204 | 8 (7) | 27,987 |
| 2024 | 10 | 132 | 0 | 68,262 |
| 2025 | 7 | 189 | 0 | 60,279 |
| 2026 | 10 | 214 | 2 (2) | — |
What is it indicated for?
The HC604 CPAP Humidifier is used to assist with patient breathing while sleeping, for the purpose of treating Obstructive Sleep Apnea (OSA). This is by the delivery of Continuous Positive Airway Pressure (CPAP) in order to prevent airway obstruction. The addition of heated respiratory humidification to this therapy relieves the drying and irritating effects on the patient airways, which may arise from use of a CPAP system.
The HC604 CPAP Humidifier is for use on adult, spontaneously breathing (non-ventilator dependant) patients at home or in the sleep laboratory.
Indications for use as stated in the FDA summary.
https://510kreport.com/device/K041900 · printed Nov 6, 2026
Cite this page
510(k) Report. “K041900: HC604 Cpap Humidifier.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 6, 2026. https://510kreport.com/device/K041900
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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