An apparatus for joining high pressure ducts has a first and second bar secured to adjacent to be joined ducts. An embodiment of the method includes a method for harvesting a vessel for subsequent use in a grafting procedure, such as, for example, saphenous vein graft harvesting for a coronary bypass surgical operation. In some embodiments the ends of the sling are attached to an anatomical support structure. In one embodiment, the improved data input multiplexer is provided on two of four data input terminals of the function generator, enabling the implementation of an 8-to-1 multiplexer using only a single function generator. Sensed current and voltage signals are produced from the current sensor signal.