Reported Reactions

Devices › Stent, metallic, expandable, duodenal

Device brand name · Mum stent metalic expandable duodenal

Evolution Duodenal Controlled-Release Stent - Uncovered: medical device reports filed with FDA

203 reports name it, 2013–2025. Manufacturer given most often on reports: Cook Ireland. Product code MUM.

203
device reports naming the brand
0% of all MAUDE reports · about 15 a year
5
reports, 12 months to August 2026
13 in the 12 months before
52.7%
classified as malfunction
51% across the product code
0.5%
classified as death, as reported
1 reports · not verified by FDA

FDA's MAUDE database holds 203 reports that name the brand "Evolution Duodenal Controlled-Release Stent - Uncovered" (mum stent metalic expandable duodenal), received between January 2013 and December 2025; the manufacturer given most often on reports is Cook Ireland. Spellings of one product vary from report to report.

5 reports arrived in the 12 months to August 2026, down 62% from 13 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 (52.7%), injury (46.8%) and death (0.5%); 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 (14.8%), delivery system failure (10.3%) and break (8.9%). The patient problems coded most often are obstruction/occlusion, perforation and hemorrhage/blood loss/bleeding. 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

0815Sep 2021: 1Oct 2021: 3Nov 2021: 2Dec 2021: 02022Jan 2022: 1Feb 2022: 0Mar 2022: 0Apr 2022: 1May 2022: 0Jun 2022: 0Jul 2022: 0Aug 2022: 0Sep 2022: 0Oct 2022: 0Nov 2022: 0Dec 2022: 22023Jan 2023: 15Feb 2023: 8Mar 2023: 0Apr 2023: 0May 2023: 1Jun 2023: 0Jul 2023: 1Aug 2023: 0Sep 2023: 2Oct 2023: 0Nov 2023: 1Dec 2023: 62024Jan 2024: 0Feb 2024: 0Mar 2024: 1Apr 2024: 1May 2024: 0Jun 2024: 1Jul 2024: 0Aug 2024: 1Sep 2024: 0Oct 2024: 0Nov 2024: 0Dec 2024: 92025Jan 2025: 1Feb 2025: 0Mar 2025: 1Apr 2025: 0May 2025: 0Jun 2025: 1Jul 2025: 0Aug 2025: 1Sep 2025: 0Oct 2025: 1Nov 2025: 1Dec 2025: 32026Jan 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

021422013: 420132014: 62015: 820152016: 52017: 3620172018: 152019: 1220192020: 152021: 4220212022: 42023: 3420232024: 132025: 92025

Event type and report source

Event type, as classified on the report

Death0.5%1
Injury46.8%95
Malfunction52.7%107
Other0%0
Not given0%0

Who filed the report

Manufacturer report92.6%188
Voluntary report0%0
User facility report0%0
Distributor report7.4%15
Not given0%0

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)ReportsShareShare across product code
Activation, positioning or separation problem3014.8%13.8%
Delivery system failure2110.3%2.2%
Breakthe device broke188.9%17.2%
Migrationthe device moved from where it was placed136.4%4.8%
Fracturea broken bone125.9%10.4%
Activation failure115.4%5.9%
Improper or incorrect procedure or method115.4%1%
Partial blockage83.9%3.2%
Material twisted/bent63%0.8%
Off-label use63%0.5%
Complete blockage42%0.4%
Material deformation42%3.2%
Device damaged prior to usethe device was damaged before use31.5%0.4%
Activation problem21%0.2%
Collapse21%0.3%
Deformation due to compressive stress21%0.3%
Detachment of device or device componentpart of the device came off21%1%
Difficult to advance21%0.4%
Material separation21%0.2%
Defective devicethe device was defective10.5%0.3%

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
Obstruction/occlusion3517.2%
Perforation125.9%
Hemorrhage/blood loss/bleeding83.9%
Foreign body in patientpart of a device left in the patient73.4%
Gastrointestinal hemorrhage73.4%
Occlusion63%
Cholangitis52.5%
Inflammationinflammation42%
Pneumonialung infection42%
Aspiration/inhalation31.5%
Abdominal painstomach or belly pain21%
Blood loss21%
Bowel perforation21%
Fever21%
Pancreatitisinflammation of the pancreas21%

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

In context

MeasureEvolution Duodenal Controlled-Release Stent - UncoveredProduct code MUMAll MAUDE reports
Reports20399226,136,888
Share of that pool—20.5%0%
Classified as death, per 1,000 reports5559
Classified as injury46.8%43.1%36.2%
Classified as malfunction52.7%51%62.3%
Filed by the manufacturer92.6%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

BrandReportsLatest 12 monthsClassified as death
WallFlex? Duodenal31864.7%
Wallflex Enteral Duodenal Stent With Anchor Lock Delivery System Mod M0056501017508.6%
Wallstent Enteral Endoprosthesis162010.5%
Wallstent Biliary16150.6%

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 Evolution Duodenal Controlled-Release Stent - Uncovered reports

How many FDA reports name Evolution Duodenal Controlled-Release Stent - Uncovered?

203 medical device reports in the openFDA MAUDE release of 28 Sep 2026, covering reports received through August 2026; 5 in the latest 12 months.

What kinds of events are reported?

malfunction (52.7%), injury (46.8%) and death (0.5%). "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 (14.8%), delivery system failure (10.3%), break (8.9%), migration (6.4%) and fracture (5.9%). These are FDA's device problem codes as entered on the report.

Who files these reports?

manufacturer reports (92.6%) and distributor reports (7.4%). Manufacturers and user facilities are required to report; voluntary reports come from health professionals and the public.

Do these reports show that Evolution Duodenal Controlled-Release Stent - Uncovered 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.