Reported Reactions

Devices › Sensor, glucose, invasive

Device brand name · Sensor glucose invasive

Transmitter Mmt-7731 Gst3b Replacement: medical device reports filed with FDA

1,147 reports name it, 2017–2024. Manufacturer given most often on reports: Medtronic Minimed. Product code MDS.

1,147
device reports naming the brand
0% of all MAUDE reports · about 129 a year
0
reports, 12 months to August 2026
3 in the 12 months before
100%
classified as malfunction
94.9% across the product code
0%
classified as death, as reported
0 reports · not verified by FDA

FDA's MAUDE database holds 1,147 reports that name the brand "Transmitter Mmt-7731 Gst3b Replacement" (sensor glucose invasive), received between August 2017 and December 2024; the manufacturer given most often on reports is Medtronic Minimed. Spellings of one product vary from report to report.

0 reports arrived in the 12 months to August 2026, against 3 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 (100%); across all sensor, glucose, invasive reports (product code MDS) death is recorded in 0.1% and malfunction in 94.9%. Event type is the reporter's classification of the report, not a verified outcome.

The device problems coded most often are wireless communication problem (60.9%), communication or transmission problem (32.6%) and battery problem (17.2%). The patient problems coded most often are hyperglycemia, hypoglycemia and discomfort. 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

0185369Sep 2021: 0Oct 2021: 0Nov 2021: 0Dec 2021: 02022Jan 2022: 0Feb 2022: 0Mar 2022: 234Apr 2022: 4May 2022: 15Jun 2022: 3Jul 2022: 25Aug 2022: 22Sep 2022: 40Oct 2022: 7Nov 2022: 21Dec 2022: 302023Jan 2023: 261Feb 2023: 369Mar 2023: 15Apr 2023: 20May 2023: 11Jun 2023: 6Jul 2023: 9Aug 2023: 5Sep 2023: 4Oct 2023: 2Nov 2023: 9Dec 2023: 42024Jan 2024: 11Feb 2024: 4Mar 2024: 7Apr 2024: 0May 2024: 0Jun 2024: 1Jul 2024: 1Aug 2024: 1Sep 2024: 1Oct 2024: 1Nov 2024: 0Dec 2024: 12025Jan 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

03587152017: 320172022: 40120222023: 71520232024: 282024

Event type and report source

Event type, as classified on the report

Death0%0
Injury0%0
Malfunction100%1,147
Other0%0
Not given0%0

Who filed the report

Manufacturer report100%1,147
Voluntary report0%0
User facility report0%0
Distributor report0%0
Not given0%0

Grey bar: all 282,102 reports carrying product code MDS. Event type is the filer's classification and is not verified by FDA.

Device problems coded

Device problem (FDA code)ReportsShareShare across product code
Wireless communication problema wireless connection problem69960.9%21.3%
Communication or transmission problemthe device could not communicate or transmit37432.6%2.7%
Battery problema problem with the battery19717.2%1.5%
Display or visual feedback problem958.3%0.6%
Failure of device to self-test262.3%0.1%
Breakthe device broke191.7%0.8%
Calibration problem131.1%0.3%
Incorrect, inadequate or imprecise result or readings131.1%0.6%
Inappropriate or unexpected reset40.3%1.1%
Computer software problema software problem30.3%1.2%
Device markings/labelling problema problem with the device markings or label20.2%0%
Manufacturing, packaging or shipping problem10.1%0%

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
Hyperglycemiahigh blood sugar100.9%
Hypoglycemialow blood sugar30.3%
Discomfortdiscomfort10.1%

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

In context

MeasureTransmitter Mmt-7731 Gst3b ReplacementProduct code MDSAll MAUDE reports
Reports1,147282,10226,136,888
Share of that pool—0.4%0%
Classified as death, per 1,000 reports019
Classified as injury0%4.8%36.2%
Classified as malfunction100%94.9%62.3%
Filed by the manufacturer100%99.6%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 MDS

BrandReportsLatest 12 monthsClassified as death
Dexcom G5 Mobile Continuous Glucose Monitoring System332,49260%
Dexcom G4 Platinum Continuous Glucose Monitoring System53,68100.1%
G4 Platinum Continuous Glucose Monitoring System48,90600.1%
Dexcom G4 Platinum Continuous Glucose Monitoring System Dexcom Share System17,71700.1%
Xmtr MMT-7811NA GST3C Lockout17,012650%
Animas Vibe88,70300%
Paradigm Real-Time Insulin Infusion Pump126,28200.3%
Unknown XMTR4,4312,0270%
Carelink Personal Mmt-73333,6802330%
Guardian Link 3 OUS6,6637330%
Ni32,9391,5871.8%
Dexcom G4 Platinum Continuous Monitoring System Dexcom Share System2,29300.3%
Paradigm Real-Time Revel Insulin Infusion Pump178,69100.6%
Transmitter Mmt-7841zw Gst5g Ous31,57212,3510%
Xmtr Mmt-7821lna Gst4c Replacement1,685130%

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 Transmitter Mmt-7731 Gst3b Replacement reports

How many FDA reports name Transmitter Mmt-7731 Gst3b Replacement?

1,147 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 (100%). "Event type" is how the report was classified when filed: death, injury, malfunction or other.

What device problems are coded?

wireless communication problem (60.9%), communication or transmission problem (32.6%), battery problem (17.2%), display or visual feedback problem (8.3%) and failure of device to self-test (2.3%). 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 Transmitter Mmt-7731 Gst3b Replacement 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.