Boston Scientific Lead Recall Shows What FDA's MAUDE Reports Can and Cannot Show

The FDA said on Sept. 3 that Boston Scientific has recommended removing all unused Infinion CX leads, a component of its spinal cord stimulator systems, from where they are used or sold. In a MedWatch bulletin, the agency said that "as of May 27, 2026, Boston Scientific has reported 1,081 serious injuries and no deaths associated with this issue," and that the action does not affect leads already implanted.

The FDA's recall database entry lists it as a Class I recall, number Z-2879-2026, initiated by the company on June 17 and posted on Aug. 5. MedTech Dive reported that, according to the FDA notice, mechanical stress at the lead's anchor site may result in high impedance measurements or lead fractures. Boston Scientific told MedTech Dive that an event can be categorized as a serious injury under FDA reporting requirements when medical or surgical intervention is required.

The notice does not break the figure down. But the injury reports that manufacturers file under FDA's medical device reporting rules are the raw material of the agency's public Manufacturer and User Facility Device Experience database, known as MAUDE, and the rules behind it explain what such counts mean.

Who has to report

Federal rules in 21 CFR Part 803 set the obligations. A manufacturer must report to FDA no later than 30 calendar days after it learns of information that reasonably suggests a device it markets "may have caused or contributed to a death or serious injury," or has malfunctioned in a way that would be likely to cause or contribute to one if it recurred. Hospitals and other user facilities must report deaths to FDA and the manufacturer, and serious injuries to the manufacturer, within 10 work days. MAUDE also holds voluntary reports, which FDA identifies with numbers beginning "MW."

The definitions are broad. A serious injury includes one that "necessitates medical or surgical intervention to preclude permanent impairment of a body function or permanent damage to a body structure." "Caused or contributed" covers events that were or may have been attributed to a device, including through failure, malfunction or inadequate design.

What the database shows

FDA's MAUDE page says the database contains medical device reports of adverse events and is updated monthly with reports received through the end of the previous month. Each record can include the brand name, the product code, the type of reportable event (death, serious injury or malfunction), coded device and patient problems, and a narrative from the reporter and manufacturer. Some text is redacted, such as trade secrets or a patient's date of birth.

Follow-up reports are folded into the original record, and some reports summarize several events at once, which FDA marks with a field for the number of events summarized.

What it cannot show

FDA is direct about the limits. Its MAUDE page says the data "is not intended to be used either to evaluate rates of adverse events, evaluate a change in event rates over time, or to compare adverse event occurrence rates across devices." It adds that "the submission of an MDR itself does not necessarily demonstrate that the device caused or contributed to the adverse outcome or event."

The agency calls MAUDE a passive surveillance system and lists the reasons: under-reporting of events, inaccuracies in reports, lack of verification that the device caused the reported event, and lack of information about how often a device is used. Without that last number, a count of reports cannot be turned into a rate. The regulations also say a report does not necessarily reflect a conclusion by the reporter or by FDA that the device caused the event.

FDA says it reviews all reports in the context of other information about a device. In the Infinion CX case, the agency's notice paired the reported injury count with the company's removal of unused leads and a recommendation of no extra monitoring for implanted patients beyond routine follow-up, according to MedTech Dive.