How would a surgically implanted bomb be detonated... GSM or manual detonation? If its a remotely detonated using GSM then retraining the passenger and sending fighter jets up will do nothing.
As a precaution it would probably be wise to remove the passenger from the flight asap. Is it possible to open the doors on an airliner whilst it is in flight? Do passenger jets carry a parachute for such events? Should they not be made mandatory? Imagine the psychological stress a crew would face if forced to disembark someone en-route without a parachute.