A system and method for migrating a managed subscriber device from an incumbent managing server to a new managing server. A single incision may be made in an end of the graft vessel, such that the graft vessel includes a single flap for connection to the target vessel. The first differential comparator circuit receives the positive differential clock signal and a reference voltage, and generates a first output signal. Furthermore, a second information piece having an outer diameter dimension of the sheath tube as an index is on at least one of the introducer sheath and the three-way stopcock portion. The timer circuit is configured to cause an assertion of the first interrupt signal in response to an expiration of the time period.