According to Reuters, the FDA is "investigating safety concerns raised by a former Medtronic Inc. employee about a wireless device used to treat heart failure."

"The Concerto device, approved by the FDA in May 2006, sends tiny electrical impulses to the heart to resynchronize the contractions of its lower chambers and can deliver a shock to correct a dangerously abnormal heart rhythm," the article states, noting that more than 11,000 of the devices have already been implanted in patients.

Former Medtronic employee Christopher Fuller says the company ignored his concerns about the stability of the device's wireless monitoring system. According to WebMD's Shelley Wood, "Fuller has suggested that the Concerto's long-distance telemetry is subject to instability and that this instability can cause excessive battery depletion, 'burn up' other circuitry in the device, or prevent it from working properly."

I'm a big fan of wireless technology myself, but I can't say I'd be too thrilled about counting on it to keep my heart beating...

More here from the St. Paul Pioneer Press, and here from CNN Money.