225 to buckle in a predetermined direction under a sufficient longitudinally compressive load applied to the operative segment as shown in the sequence of drawings in fig1 a 1b and 1c the predetermined direction can be substantially radially outward relative to the longitudinal axis e g axis 120 as shown in fig2 a wire pitch of the operative segment 225 is substantially lower than a wire pitch of one or both of the opposed end portions 231 a b as used herein u201c wire pitch u201d refers to a ratio of a measure of a given wire 39 s circumferential winding to a measure of length in some instances the measure of length can be measured relative to the resulting construct e g a directional mesh 100 200 and in other instances the measure of length can be measured relative to the wire e g a length of the wire 201 as but one example a given wire pitch of a wire extending about half way around a longitudinal axis in one centimeter could be 0 5 windings per centimeter another relatively higher wire pitch could be 2 windings per centimeter in a general sense regions of a woven construct 200 outside the operative segment 225 can be woven to a suitably high pitch e g approaching a u201c solid tubular u201d construct as but one example a 0 041 inch mandrel was used to weave a 0 005 inch.