The process for creating, administering and operating distribution maps of the radiocommunications traffic is executed by means of an information system storing data representative of geographical maps cut up into pixels according to the way said network is cut up, and data representative of the traffic in the network. The ball nut incudes a radial through slot and an outer surface. A variety of media pack shapes can be used. Closing of the windowed restrictor generally restricts mud flow. The therapeutic drug, such as a thrombolytic or anti-coagulatory drug, may be eluted in response to a captured emboli.