Reported Reactions

Devices › Humidifier, respiratory gas, (direct patient interface)

Device brand name · Btt

Adult Inspiratory Heated Breathing Circuit: medical device reports filed with FDA

449 reports name it, 2008–2023. Manufacturer given most often on reports: Fisher & Paykel Healthcare. Product code BTT.

449
device reports naming the brand
0% of all MAUDE reports · about 25 a year
0
reports, 12 months to August 2026
0 in the 12 months before
99.1%
classified as malfunction
96.1% across the product code
0.2%
classified as death, as reported
1 reports · not verified by FDA

FDA's MAUDE database holds 449 reports that name the brand "Adult Inspiratory Heated Breathing Circuit" (btt), received between June 2008 and September 2023; the manufacturer given most often on reports is Fisher & Paykel Healthcare. Spellings of one product vary from report to report.

0 reports arrived in the 12 months to August 2026, and none 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 (99.1%), other (0.4%) and death (0.2%); across all humidifier, respiratory gas, (direct patient interface) reports (product code BTT) death is recorded in 0.7% and malfunction in 96.1%. Event type is the reporter's classification of the report, not a verified outcome.

The device problems coded most often are device operates differently than expected (21.4%), leak/splash (11.6%) and air leak (7.8%). The patient problems coded most often are no patient involvement and low oxygen saturation. 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."

Reports by month, five years

023Sep 2021: 2Oct 2021: 2Nov 2021: 2Dec 2021: 12022Jan 2022: 2Feb 2022: 0Mar 2022: 1Apr 2022: 0May 2022: 1Jun 2022: 1Jul 2022: 2Aug 2022: 1Sep 2022: 1Oct 2022: 3Nov 2022: 1Dec 2022: 12023Jan 2023: 3Feb 2023: 1Mar 2023: 1Apr 2023: 0May 2023: 2Jun 2023: 2Jul 2023: 1Aug 2023: 0Sep 2023: 1Oct 2023: 0Nov 2023: 0Dec 2023: 02024Jan 2024: 0Feb 2024: 0Mar 2024: 0Apr 2024: 0May 2024: 0Jun 2024: 0Jul 2024: 0Aug 2024: 0Sep 2024: 0Oct 2024: 0Nov 2024: 0Dec 2024: 02025Jan 2025: 0Feb 2025: 0Mar 2025: 0Apr 2025: 0May 2025: 0Jun 2025: 0Jul 2025: 0Aug 2025: 0Sep 2025: 0Oct 2025: 0Nov 2025: 0Dec 2025: 02026Jan 2026: 0Feb 2026: 0Mar 2026: 0Apr 2026: 0May 2026: 0Jun 2026: 0Jul 2026: 0Aug 2026: 0

Reports by the month FDA received them. FDA releases MAUDE data monthly; reports can arrive months after an event, so the newest months grow in later releases.

By year received

0561122008: 1920082009: 1122010: 6420102011: 302012: 3520122013: 962014: 2620142015: 52017: 620172018: 42020: 1020202021: 172022: 1420222023: 11

Event type and report source

Event type, as classified on the report

Death0.2%1
Injury0.2%1
Malfunction99.1%445
Other0.4%2
Not given0%0

Who filed the report

Manufacturer report100%449
Voluntary report0%0
User facility report0%0
Distributor report0%0
Not given0%0

Grey bar: all 18,530 reports carrying product code BTT. Event type is the filer's classification and is not verified by FDA.

Device problems coded

Device problem (FDA code)ReportsShareShare across product code
Device operates differently than expectedthe device behaved unexpectedly9621.4%2.6%
Leak/splashthe device leaked5211.6%6.2%
Air leak357.8%0.9%
Breakthe device broke327.1%4.3%
Component missing316.9%1.2%
Circuit failure255.6%0.5%
Device displays incorrect message224.9%0.9%
Insufficient heating184%2.6%
Bent163.6%0.8%
Connection problema connection problem153.3%1.7%
Defective devicethe device was defective132.9%0.3%
Fluid/blood leak122.7%5.4%
Hole in material112.4%0.5%
Gas/air leak102.2%1%
Failure of device to self-test92%0.2%
Therapeutic or diagnostic output failure71.6%0.2%
Device alarm system61.3%1.9%
Disconnection61.3%0.9%
Detachment of device component51.1%0.7%
Temperature problem51.1%1.3%

FDA's device problem codes as entered on the report; one report can carry several. Generic codes such as "no apparent adverse event" are left out.

Patient problems coded

Patient problem (FDA code)ReportsShare
No patient involvement14432.1%
Low oxygen saturation30.7%

Patient problem codes are present mainly in reports filed since 2019 and are often blank.

In context

MeasureAdult Inspiratory Heated Breathing CircuitProduct code BTTAll MAUDE reports
Reports44918,53026,136,888
Share of that pool—2.4%0%
Classified as death, per 1,000 reports279
Classified as injury0.2%2.2%36.2%
Classified as malfunction99.1%96.1%62.3%
Filed by the manufacturer100%97%94.9%

Shares are of reports, not of devices in use. 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."

Other brands with product code BTT

BrandReportsLatest 12 monthsClassified as death
Fisher & Paykel Healthcare4,7803,3740.3%
Airvo 2 Humidifier1,97000.6%
Airvo2 Humidifier1,79700.7%
Hudson Concha Neptune1,67900.1%
Vented Autofeed Humidification Chamber80900%
Vented Humidification Chamber49300%
Vented Autofeed Chamber47800%
Respiratory Humidifier44801.8%
Optiflow + Adult Nasal Cannula42342.6%
Myairvo Humidifier34800.3%
Fisher and Paykel Healthcare3331340%
Adult Breathing Circuit29200.7%
Adult Dual Heated Breathing Circuit23200%
Autofeed Humidification Chamber21000%
Myairvo 2 Humidifier19800.5%

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." FDA also states that "common products may have a higher number of adverse events due to the higher total number of people using the product."

Questions about Adult Inspiratory Heated Breathing Circuit reports

How many FDA reports name Adult Inspiratory Heated Breathing Circuit?

449 medical device reports in the openFDA MAUDE release of 28 Sep 2026, covering reports received through August 2026; 0 in the latest 12 months.

What kinds of events are reported?

malfunction (99.1%), other (0.4%) and death (0.2%). "Event type" is how the report was classified when filed: death, injury, malfunction or other.

What device problems are coded?

device operates differently than expected (21.4%), leak/splash (11.6%), air leak (7.8%), break (7.1%) and component missing (6.9%). These are FDA's device problem codes as entered on the report.

Who files these reports?

manufacturer reports (100%). Manufacturers and user facilities are required to report; voluntary reports come from health professionals and the public.

Do these reports show that Adult Inspiratory Heated Breathing Circuit was at fault?

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." FDA adds that "a causal relationship cannot be established between product and reactions listed in a report."

How do I report a problem with a medical device?

Through FDA MedWatch (Form FDA 3500 for health professionals and consumers), or to the manufacturer. See the guide on how to report.

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. A report counts here when any device it lists carries this brand name after punctuation and capitalisation are normalised. 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.