A medical balloon catheter, comprising: an elongate non-interlaced swaged stainless steel multifilar tube, said tube comprising a proximal multifilar tube end, a distal multifilar tube end; an outer diameter of about 0.51-2.54 mm (20-100 mil) of the multifilar tube exclusive of the connecting tube element, and an inner diameter of about 0.51-2.03 mm (20-80 mil), where the inner diameter is less than the outer diameter; a polymer barrier coating, the polymer barrier comprising a polyether block amide material, and wherein a fluid-patent longitudinal multifilar tube lumen portion extends from the proximal multifilar tube end; a dual-lumen polymer tube comprising a proximal polymer tube end attached directly to a roughened surface adjacent the distal multifilar tube end, a distal polymer tube end, a first lumen configured as a fluid-patent polymer tube inflation lumen that extends distally from, and is in patent fluid communication with, the multifilar tube lumen, and a second lumen configured as a wire guide lumen extending parallel to the first lumen with a wire guide aperture immediately adjacent the proximal polymer tube end; an inflatable balloon directly attached to the distal polymer tube end such that a lumen of the balloon is in patent fluid communication with the first lumen; where the multifilar tube lumen and the first lumen together comprise a substantially patent path of fluid communication between the multifilar tube end and the balloon lumen; and where the second lumen forms a fluid-patent path of mechanical communication for a wire guide, which extends from a wire guide aperture near the proximal polymer tube end through the balloon lumen to a distal end of the balloon; characterised in that there extends from the distal multifilar tube end a connecting tube element having a smaller outer diameter than the distal multifilar tube end, the polymer barrier thermoformed around the multifilar tube and the connecting tube element, where the polymer barrier coating extends distally beyond the distal multifilar tube end and the connecting tube element, said fluid-patent longitudinal multifilar tube lumen portion extends to a distal end of the connecting tube element, and said proximal polymer tube end is configured to receive the connecting tube element. an elongate non-interlaced swaged stainless steel multifilar tube, said tube comprising a proximal multifilar tube end, a distal multifilar tube end; an outer diameter of about 0.51-2.54 mm (20-100 mil) of the multifilar tube exclusive of the connecting tube element, and an inner diameter of about 0.51-2.03 mm (20-80 mil), where the inner diameter is less than the outer diameter; a polymer barrier coating, the polymer barrier comprising a polyether block amide material, and wherein a fluid-patent longitudinal multifilar tube lumen portion extends from the proximal multifilar tube end; a dual-lumen polymer tube comprising a proximal polymer tube end attached directly to a roughened surface adjacent the distal multifilar tube end, a distal polymer tube end, a first lumen configured as a fluid-patent polymer tube inflation lumen that extends distally from, and is in patent fluid communication with, the multifilar tube lumen, and a second lumen configured as a wire guide lumen extending parallel to the first lumen with a wire guide aperture immediately adjacent the proximal polymer tube end; an inflatable balloon directly attached to the distal polymer tube end such that a lumen of the balloon is in patent fluid communication with the first lumen; where the multifilar tube lumen and the first lumen together comprise a substantially patent path of fluid communication between the multifilar tube end and the balloon lumen; and where the second lumen forms a fluid-patent path of mechanical communication for a wire guide, which extends from a wire guide aperture near the proximal polymer tube end through the balloon lumen to a distal end of the balloon; characterised in that there extends from the distal multifilar tube end a connecting tube element having a smaller outer diameter than the distal multifilar tube end, the polymer barrier thermoformed around the multifilar tube and the connecting tube element, where the polymer barrier coating extends distally beyond the distal multifilar tube end and the connecting tube element, said fluid-patent longitudinal multifilar tube lumen portion extends to a distal end of the connecting tube element, and said proximal polymer tube end is configured to receive the connecting tube element.