A medical device shaft includes a first longitudinal edge joined to all or a portion of a second longitudinal edge, and an inner surface forming a plurality of lumens separated by a plurality of longitudinal ribs extending along a length of the shaft; wherein a base of each rib is spaced apart from one another and each rib is joined to one another in proximity to a peak of each rib. Each of a plurality of elongated members extends within one of the plurality of lumens of the shaft.

 
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