A stent-valve delivery catheter comprises a flexible sub-assembly for transmitting a pushing force from a proximal portion to a distal portion of the catheter. The sub-assembly comprises a tubular support carrying a segmented tube. The segmented tube comprises first segments of a first elastic modulus alternating with second segments of a second elastic modulus. The first segments may be of metal, the second segments of plastics. The sub-assembly combines flexibility provided by the second segments with axial support bearing axial compression force provided by the first segments.
