Abstract: An apparatus and a method for establishing a static column of gas inside a blood vessel and a system for automatically regulating the delivery and removal of the gas from the target blood vessel. The regulated gas delivery system for use with the gas-column angioscopy procedure comprises a gas reservoir, a pair of syringes operated by computer controlled electromotors, a valve system for directing the flow of gas into and out of the system, and a catheter assembly for establishing the gas-column inside the target vessel and for introducing fiber optic and microsurgical devices into the lumen of the target vessel.

Abstract: The invention relates to a linearly moving or rotated flat armature for motors and pulling magnets, comprising a carrier of plastics or of ceramics and a coil system placed on this carrier. The flat armature according to the invention has a carrier which contains 2 to 50% by weight of a mild magnetic substance distributed therein homogeneously.The flat armature according to the invention makes possible an increase of the efficiency of the motor or of the pulling magnet at identical dimensions.