Stent, metallic, expandable, duodenal: medical device reports filed with FDA

992 reports carry this product code, 2005–2026; 5 brands with a page.

Read first · FDA's statement on these data

Adverse event reports submitted to FDA do not undergo extensive validation or verification. Therefore, a causal relationship cannot be established between product and reactions listed in a report. While a suspected relationship may exist, it is not medically validated and should not be the sole source of information for clinical decision making or other assumptions about the safety or efficacy of a product. Additionally, it is important to remember that adverse event reports represent a small percentage of total usage numbers of a product. Common products may have a higher number of adverse events due to the higher total number of people using the product. openFDA, FDA

FDA adds: "Although MDRs are a valuable source of information, this passive surveillance system has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data. In addition, the incidence or prevalence of an event cannot be determined from this reporting system alone due to potential under-reporting of events and lack of information about frequency of device use." And: "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."

Do not rely on openFDA to make decisions regarding medical care. While we make every effort to ensure that data is accurate, you should assume all results are unvalidated.

Not medical advice. This site counts what was reported to FDA. Questions about a medicine or device belong with a pharmacist or clinician.

992
reports with this product code: 0% of all MAUDE reports; 22
reports, 12 months to August 2026: 30 in the 12 months before; 51%
classified as malfunction: 62.3% across all reports; 5.5%
classified as death, as reported: 0.9% across all reports

Product code MUM is FDA's classification for "Stent, metallic, expandable, duodenal" (general, Plastic Surgery panel), a class 2 device. 992 medical device reports carry this product code, 0% of the MAUDE database, from April 2005 to August 2026.

22 reports arrived in the 12 months to August 2026, down 27% from 30 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 (51%), injury (43.1%) and death (5.5%). 5 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

Brand	Reports	Latest 12 months	Classified as death	Classified as malfunction
WallFlex? Duodenal	318	6	4.7%	58.8%
Evolution Duodenal Controlled-Release Stent - Uncovered	194	5	0.5%	52.7%
Wallflex Enteral Duodenal Stent With Anchor Lock Delivery System Mod M00565010	175	0	8.6%	42.9%
Wallstent Enteral Endoprosthesis	19	0	10.5%	23.5%
Wallstent Biliary	7	5	0.6%	72.7%

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
Boston Scientific - Galway	343	34.6%
Cook Ireland	199	20.1%
Boston Scientific Ireland	69	7%

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

Death5.5%55

Injury43.1%428

Malfunction51%506

Other0.1%1

Not given0.2%2

Who filed

Manufacturer report98.3%975

Voluntary report0.3%3

User facility report0%0

Distributor report1%10

Not given0.4%4

Grey bar: all 26,136,888 MAUDE reports.

Device problems coded

Device problem (FDA code)	Reports	Share
Breakthe device broke	171	17.2%
Activation, positioning or separation problem	137	13.8%
Fracturea broken bone	103	10.4%
Positioning failure	70	7.1%
Activation failure	59	5.9%
Positioning problem	59	5.9%
Migration or expulsion of device	53	5.3%
Migrationthe device moved from where it was placed	48	4.8%
Other (for use when an appropriate device code cannot be identified)	43	4.3%
Premature activation	33	3.3%
Delamination	32	3.2%
Material deformation	32	3.2%
Partial blockage	32	3.2%
Difficult to removethe device was hard to remove	23	2.3%
Obstruction of flow	23	2.3%
Delivery system failure	22	2.2%
Difficult or delayed positioning	21	2.1%
Insufficient device problem information	19	1.9%
Kinkedthe tube or line kinked	17	1.7%
Detachment of device component	15	1.5%

Questions about stent, metallic, expandable, duodenal reports

What is product code MUM?

FDA's classification code for "Stent, metallic, expandable, duodenal", class 2, reviewed by the general, Plastic Surgery panel. Every device report carries the product code of the device involved.

How many reports carry this code?

992 reports through August 2026, 22 of them in the latest 12 months.

Which brands appear most often?

WallFlex? Duodenal (318), Evolution Duodenal Controlled-Release Stent - Uncovered (194), Wallflex Enteral Duodenal Stent With Anchor Lock Delivery System Mod M00565010 (175), Wallstent Enteral Endoprosthesis (19) and Wallstent Biliary (7). 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.