A steering device for use in a body lumen of a patient, which comprises a flexible tube； a plurality of spaced-apart elements positioned along at least a portion of the tube； wherein the plurality of spaced-apart elements and the tube form a single integrated unit； and at least two steering wires having at least a portion passing through the spaced-apart elements and at least a portion passing within the tube. According to another broad aspect, there is provided a steering device for use in a body lumen of a patient, comprising: a flexible tube； at least two steering wires having at least a portion passing within the flexible tube； at least two spring-like sleeves； each spring-like sleeve at least partially enclosing a steering wire respectively； wherein the spring-like sleeve has a variable pitch along its length； such that the flexible tube comprises at least two portions having different bending properties.
