Device malfunction

A device malfunction is the reportable outcome type in which a device failed to perform as intended - one of the three outcomes a medical device report (MDR) can record, alongside injury and death. A malfunction report does not assert patient harm; it asserts the device did not do what it was supposed to do.

In the catalog the term is structural, not descriptive. The openFDA Device Adverse Events (MAUDE) API record describes its coverage as 'covering device malfunctions, injuries and deaths', with one record per adverse event report and nested arrays per device and per patient involved.

Because malfunctions do not require harm, they dominate the volume - and they are the earliest signal.

Malfunction reports are the largest and noisiest part of device safety data, and mishandling them cuts both ways:

• Volume without harm is easy to over-read. A malfunction count is not an injury count; summing all 25.7M MAUDE records inflates apparent risk.

• Filtering to injuries hides signal. The record's tags include 'recalls' and 'device-safety' because malfunctions often trigger them; injuries-only views remove the early warning.

• Event-level records need device-level joins. Coverage is 'one record per adverse event report with per-device detail' - a report can involve multiple devices, so naive row counts misstate device exposure.

Use the report type as your first filter, deliberately:

1. Filter by event type explicitly. The MAUDE record covers malfunctions, injuries and deaths as distinct outcomes; state which your analysis includes before quoting a count against the 25,711,469-record total.
2. Respect the nested structure. One record per adverse event report with arrays per device and per patient means device-level analysis needs array expansion, not row counts.
3. Pair with the recall record. The openFDA Device Recalls API holds the enforcement actions that malfunction clusters often precede - the two together are the surveillance loop.

These entries cover the reporting and enforcement records malfunctions feed into:

• MAUDE - the FDA's Manufacturer and User Facility Device Experience database of adverse event reports, exposed through the openFDA Device Adverse Events API with 25,711,469 records as of the 2026-08-11 data load.
• Medical Device Report (MDR) - the mandatory report filed with the FDA when a device may have caused or contributed to a death, serious injury or malfunction; each MDR is one MAUDE record.
• Device recall - a correction or removal action addressing a violation of FDA law, cataloged in the openFDA Device Recalls API as the enforcement-side counterpart to adverse event reporting.