Devices › Stent, metallic, expandable, duodenal
Device brand name · Stent metallic expandable duodenal
WallFlex? Duodenal: medical device reports filed with FDA
318 reports name it, 2011–2026. Manufacturer given most often on reports: Boston Scientific - Galway. Product code MUM.
- 318
- device reports naming the brand
- 0% of all MAUDE reports · about 21 a year
- 6
- reports, 12 months to August 2026
- 9 in the 12 months before
- 58.8%
- classified as malfunction
- 51% across the product code
- 4.7%
- classified as death, as reported
- 15 reports · not verified by FDA
FDA's MAUDE database holds 318 reports that name the brand "WallFlex? Duodenal" (stent metallic expandable duodenal), received between June 2011 and August 2026; the manufacturer given most often on reports is Boston Scientific - Galway. Spellings of one product vary from report to report.
6 reports arrived in the 12 months to August 2026, down 33% from 9 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 (58.8%), injury (36.5%) and death (4.7%); across all stent, metallic, expandable, duodenal reports (product code MUM) death is recorded in 5.5% and malfunction in 51%. Event type is the reporter's classification of the report, not a verified outcome.
The device problems coded most often are activation, positioning or separation problem (24.8%), positioning problem (11%) and delamination (10.1%). The patient problems coded most often are perforation, death and abdominal pain. 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
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
Event type and report source
Event type, as classified on the report
Who filed the report
Grey bar: all 992 reports carrying product code MUM. Event type is the filer's classification and is not verified by FDA.
Device problems coded
| Device problem (FDA code) | Reports | Share | Share across product code |
|---|---|---|---|
| Activation, positioning or separation problem | 79 | 24.8% | 13.8% |
| Positioning problem | 35 | 11% | 5.9% |
| Delamination | 32 | 10.1% | 3.2% |
| Premature activation | 28 | 8.8% | 3.3% |
| Breakthe device broke | 24 | 7.5% | 17.2% |
| Activation failure | 23 | 7.2% | 5.9% |
| Material deformation | 19 | 6% | 3.2% |
| Difficult to removethe device was hard to remove | 18 | 5.7% | 2.3% |
| Positioning failure | 11 | 3.5% | 7.1% |
| Partial blockage | 10 | 3.1% | 3.2% |
| Migrationthe device moved from where it was placed | 7 | 2.2% | 4.8% |
| Detachment of device or device componentpart of the device came off | 5 | 1.6% | 1% |
| Device stenosis | 4 | 1.3% | 0.5% |
| Migration or expulsion of device | 4 | 1.3% | 5.3% |
| Difficult or delayed positioning | 3 | 0.9% | 2.1% |
| Defective devicethe device was defective | 2 | 0.6% | 0.3% |
| Detachment of device component | 2 | 0.6% | 1.5% |
| Difficult to advance | 2 | 0.6% | 0.4% |
| Failure to advance | 2 | 0.6% | 0.6% |
| Activation problem | 1 | 0.3% | 0.2% |
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) | Reports | Share |
|---|---|---|
| Perforation | 28 | 8.8% |
| Deaththe patient died; cause not stated by this term | 9 | 2.8% |
| Abdominal painstomach or belly pain | 5 | 1.6% |
| Vomitingbeing sick | 5 | 1.6% |
| Hemorrhage/blood loss/bleeding | 4 | 1.3% |
| Painpain, site not specified | 4 | 1.3% |
| Aspiration/inhalation | 2 | 0.6% |
| Bowel perforation | 2 | 0.6% |
| Discomfortdiscomfort | 2 | 0.6% |
| Erosion | 2 | 0.6% |
| Fever | 2 | 0.6% |
| Obstruction/occlusion | 2 | 0.6% |
| Peritonitis | 2 | 0.6% |
| Thrombosis/thrombus | 2 | 0.6% |
| Airway obstruction | 1 | 0.3% |
Patient problem codes are present mainly in reports filed since 2019 and are often blank.
In context
| Measure | WallFlex? Duodenal | Product code MUM | All MAUDE reports |
|---|---|---|---|
| Reports | 318 | 992 | 26,136,888 |
| Share of that pool | — | 32.1% | 0% |
| Classified as death, per 1,000 reports | 47 | 55 | 9 |
| Classified as injury | 36.5% | 43.1% | 36.2% |
| Classified as malfunction | 58.8% | 51% | 62.3% |
| Filed by the manufacturer | 99.7% | 98.3% | 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 MUM
| Brand | Reports | Latest 12 months | Classified as death |
|---|---|---|---|
| Evolution Duodenal Controlled-Release Stent - Uncovered | 203 | 5 | 0.5% |
| Wallflex Enteral Duodenal Stent With Anchor Lock Delivery System Mod M00565010 | 175 | 0 | 8.6% |
| Wallstent Enteral Endoprosthesis | 162 | 0 | 10.5% |
| Wallstent Biliary | 161 | 5 | 0.6% |
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 WallFlex? Duodenal reports
How many FDA reports name WallFlex? Duodenal?
318 medical device reports in the openFDA MAUDE release of 28 Sep 2026, covering reports received through August 2026; 6 in the latest 12 months.
What kinds of events are reported?
malfunction (58.8%), injury (36.5%) and death (4.7%). "Event type" is how the report was classified when filed: death, injury, malfunction or other.
What device problems are coded?
activation, positioning or separation problem (24.8%), positioning problem (11%), delamination (10.1%), premature activation (8.8%) and break (7.5%). These are FDA's device problem codes as entered on the report.
Who files these reports?
manufacturer reports (99.7%). Manufacturers and user facilities are required to report; voluntary reports come from health professionals and the public.
Do these reports show that WallFlex? Duodenal 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.