Approximately 40 lawsuits filed over problems associated with the Mirena intrauterine contraceptive device have been coordinated in multidistrict litigation before a federal judge in New York.

The suits allege that the device, which a doctor implants into a woman during an office visit, can migrate from its original position, tearing the uterine wall and requiring surgery to remove it. Plaintiffs’ lawyers have said in court documents that they expect hundreds, possibly thousands of cases against Bayer Healthcare Pharmaceuticals Inc.