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FDA product code BTT · class 2 · Anesthesiology
Humidifier, respiratory gas, (direct patient interface): medical device reports filed with FDA
18,530 reports carry this product code, 1992–2026; 30 brands with a page.
- 18,530
- reports with this product code
- 0.1% of all MAUDE reports
- 3,797
- reports, 12 months to August 2026
- 663 in the 12 months before
- 96.1%
- classified as malfunction
- 62.3% across all reports
- 0.7%
- classified as death, as reported
- 0.9% across all reports
Product code BTT is FDA's classification for "Humidifier, respiratory gas, (direct patient interface)" (anesthesiology panel), a class 2 device. 18,530 medical device reports carry this product code, 0.1% of the MAUDE database, from August 1992 to August 2026.
3,797 reports arrived in the 12 months to August 2026, up 473% from 663 in the 12 months before. FDA releases MAUDE data monthly; reports can arrive months after an event, so the newest months grow in later releases. The event types recorded are malfunction (96.1%), injury (2.2%) and death (0.7%). 30 brand names with a page on this site carry this code; the brands table is ordered by report count for navigation only. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data."
Brands with this product code
Ordered by report count for navigation only. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data."
Manufacturers named
| Manufacturer (as written on reports) | Reports | Share |
|---|---|---|
| Fisher & Paykel Healthcare | 13,030 | 70.3% |
| Teleflex Medical | 1,489 | 8% |
| Teleflex | 209 | 1.1% |
| Respironics | 158 | 0.9% |
| Vyaire Medical | 40 | 0.2% |
| Hamilton Medical | 29 | 0.2% |
| Resmed | 8 | 0% |
| Cardinal Health | 7 | 0% |
| Smiths Medical Asd | 7 | 0% |
| Invacare Florida Operations | 4 | 0% |
| Allegiance Healthcare | 2 | 0% |
| Baxter Healthcare | 1 | 0% |
| Datex-Ohmeda | 1 | 0% |
| Draeger Medical | 1 | 0% |
| Lifescan | 1 | 0% |
Reports by month, five years
FDA releases MAUDE data monthly; reports can arrive months after an event, so the newest months grow in later releases.
Event type and report source
Event type
Who filed
Grey bar: all 26,136,888 MAUDE reports.
Device problems coded
| Device problem (FDA code) | Reports | Share |
|---|---|---|
| No audible alarm | 4,665 | 25.2% |
| Defective alarm | 2,901 | 15.7% |
| Leak/splashthe device leaked | 1,147 | 6.2% |
| Fluid/blood leak | 1,004 | 5.4% |
| Crackthe device cracked | 886 | 4.8% |
| Breakthe device broke | 798 | 4.3% |
| Material split, cut or torn | 677 | 3.7% |
| Detachment of device or device componentpart of the device came off | 546 | 2.9% |
| Insufficient heating | 490 | 2.6% |
| Device operates differently than expectedthe device behaved unexpectedly | 483 | 2.6% |
| Failure to power up | 446 | 2.4% |
| Device alarm system | 352 | 1.9% |
| Connection problema connection problem | 317 | 1.7% |
| Power problem | 302 | 1.6% |
| Melted | 283 | 1.5% |
| Temperature problem | 238 | 1.3% |
| Component missing | 229 | 1.2% |
| Overfill | 219 | 1.2% |
| Overheating of device | 206 | 1.1% |
| Gas/air leak | 192 | 1% |
Questions about humidifier, respiratory gas, (direct patient interface) reports
What is product code BTT?
FDA's classification code for "Humidifier, respiratory gas, (direct patient interface)", class 2, reviewed by the anesthesiology panel. Every device report carries the product code of the device involved.
How many reports carry this code?
18,530 reports through August 2026, 3,797 of them in the latest 12 months.
Which brands appear most often?
Fisher & Paykel Healthcare (3,843), Airvo 2 Humidifier (1,970), Airvo2 Humidifier (1,797), Hudson Concha Neptune (1,655) and Vented Autofeed Humidification Chamber (809). Widely used products collect more reports because more people use them.
Can the brands table be used to rank the devices?
No. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data." Brands differ in how many are in use, how long they have been sold and how reports are collected.
Where this comes from. Counts are built from the openFDA Device Adverse Event (MAUDE) bulk export released 28 Sep 2026, which holds reports FDA received through 31 Aug 2026. Brand, generic and manufacturer names are as written on the reports; product code names come from FDA's device classification. No report narrative, lot number, patient detail or reporter identity is published. See the methodology and sources; FDA's record is authoritative, and corrections are handled within five working days.
Drug data (FAERS) through 30 Jun 2026; device data (MAUDE) through 31 Aug 2026. Not medical advice.