Abstract: A device to aid in establishing intravenous access by means of a sequential trapping and displacing of the venous blood in a top to bottom action down an extremity, resulting in a localized increase in the diameter of the veins, due to increased, trapped blood volume. The resulting distention of the vessels produces a stabilizing effect, thereby decreasing vascular mobility and rolling. The combination of vessel distention and stabilization greatly facilitates the obtaining of a patent I.V. The sequential trapping and milking of venous blood toward the extremity is accomplished via a specialized inflatable bladder.

Abstract: The present invention involves a network polling protocol which treats the network as a logical ring or linear sequence of nodes linked together so that a polling request is simply propagated down or around the network one node at a time until a complete inventory of active nodes is achieved. The protocols also includes procedures for curing or repairing breaks in the linking protocol and for adding new nodes to the linking protocol. The linking protocol can also be used to establish hierarchal linked networks where top level hierarchies includes addresses to a permanent member of a linked network and bottom level hierarchies are a given linked network.