The above-mentioned problem is solved by an ion pump comprising a casing, a first electrode, a second electrode, a plurality of cylindrical magnets, and a connection part. The reinforcement member has a tapered proximal portion fixed to the proximal shaft and arranged inside the lumen positioned in the intermediate shaft, a tapered distal portion arranged inside the lumen positioned in the distal shaft, and a straight transition portion positioned between the proximal portion and the distal portion. The method can include reusing or extending at least a partial path of an established connection between an initiator and the existing target end device for a connection between the initiator and the next target end device, whereby the existing target end device and the next target end device are locally attached to different expanders.