In an interview with The New York Times, Dr. Hooman Noorchashm, whose wife, Dr. Amy Reed, was harmed by the device, confirmed that they had spoken a number of times to an F.B.I. agent from Newark. A retired pathologist from Pennsylvania, Dr. Robert W. Lamparter, also said he had spoken to investigators. Both men declined to give any details about whom they spoke with, saying they had been warned that disclosing too much information could interfere with the investigation.

Dr. Reed, 42, an anesthesiologist, had a hysterectomy because of fibroid tumors in her uterus in October 2013 at Brigham and Women’s Hospital in Boston. Fibroids are benign, but they sometimes hide cancer. A biopsy after Dr. Reed’s surgery found a hidden sarcoma, an aggressive type of cancer. The tumor spread, resulting in advanced Stage 4 cancer. Dr. Reed underwent numerous rounds of chemotherapy and radical surgery, but the cancer recurred in March of this year, near her spine, requiring still more surgery.

The couple, who have six children, have conducted a ceaseless nationwide campaign to ban morcellation. Gynecology groups have resisted, saying that sarcomas are uncommon and that morcellation makes surgery less invasive and safer for the majority of women.

In November, the Food and Drug Administration said that morcellators should no longer be used in “the vast majority” of women. But the agency did not take the devices off the market or ban their use.

Dr. Noorchashm said he contacted an agent from the Newark F.B.I. office last fall, because he suspected that morcellator manufacturers and some doctors and hospitals using the devices had violated a federal law requiring that adverse events be reported to the F.D.A. He said that he and his wife spoke with the agent a number of times over a few months, and that the F.B.I. seemed increasingly interested.