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The agency said some of the company's Endotak Reliance defibrillator wires can become calcified, leading to failures in delivering life-saving shocks to the heart, according to the FDA.

Defibrillators are surgically placed in the upper chest, where they monitor irregular heartbeats and use electrical shocks to jolt the heart back to normal.

As of July 24, Boston Scientific has reported 386 serious injuries and 16 deaths associated with this issue, the agency said.

Ten of the deaths were judged to be due to the device failing to function properly, the company said in an email. Four were linked to attempts to surgically remove the devices from patients and two others were deemed unrelated to the implants.

Boston Scientific's wires were distributed between 2002 and 2021 and are no longer available, the company noted in its letter to doctors. Some patients will need to have the devices replaced, though physicians should weigh the risks of the removal procedure.

In a separate notice, the FDA said Boston Scientific recently updated instructions for implanting its Watchman device, which closes a portion of the heart's left atrium to reduce the risk of stroke.

In a letter to physicians, the company noted that there is an increased risk of blockages in the bloodstream depending on the level of anesthesia for patients undergoing the initial implantation procedure. Watchman is an alternative to long-term treatment with blood thinners for patients at increased risk of stroke.

As of July 30, the company has reported 120 serious injuries and 17 deaths related to the issue, the FDA said.

A company investigation concluded that the safety issue “is not associated with the design or manufacture of any component of the Watchman system.

Heart devices, including defibrillators and other implants, are Boston Scientific’s largest business, making up two-thirds of its $5 billion in revenue for the most recent quarter.

Shares of Boston Scientific Corp. fell nearly 1.8 percent Wednesday to close at $102.95 in trading.

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