The pouring spout includes a first tube detachably connectable to a liquid-storage container, a second tube slideably connected to the first tube, and a liquid outlet duct and an air inlet duct. The method and apparatus are particularly useful in preparation of conduits such as veins and arteries during grafting procedures. An impeller is mounted in a blower casing, and is coupled to an impeller driving shaft which is rotated with the transmission shaft by means of an endless drive transmission member such that the dust falling in the dust passageway can be drawn into the blower casing for discharge through a discharge port. The walking supporter is also appropriate for patients or the elderly who may not have enough arm-strength because it is possible to walk by pushing the walking supporter on the ground with a part of the bottom frame being in contact with the ground.