Patent ID: 8657845

Claim:
A medical balloon catheter device configured for use with a wire guide, the catheter comprising: an elongate monolayer multifilar tube comprising a plurality of generally longitudinally parallel wires twisted together having a longitudinal central lumen, said tube comprising a length from a proximal tube end to a distal tube end, wherein the longitudinal central lumen has a substantially constant inner diameter along substantially the entire multifilar tube length and extending from the proximal tube end to the distal tube end; an inflatable balloon comprising an expandable balloon lumen attached near the distal tube end such that the expandable balloon lumen is in fluid communication with the longitudinal central lumen and the distal tube end extends to the expandable balloon lumen; and a dual-lumen sleeve extending proximally from and contacting a proximal portion of the balloon, the dual-lumen sleeve constructed as a continuously integral figure-eight cross-section for at least a lengthwise portion thereof, where the dual-lumen sleeve includes a first sleeve lumen configured as a tube-surrounding lumen through which a distal portion of the multifilar tube is disposed and a second sleeve lumen constructed as a wire guide lumen structure comprising a longitudinal wire guide lumen, the wire guide lumen structure being disposed adjacent and wholly external of the distal tube end and extending distally beyond the distal tube end, a proximal end of the wire guide lumen structure comprising an aperture open to a proximal end of the wire guide lumen, said aperture configured to allow passage of a wire guide therethrough; wherein the dual lumen sleeve substantially prevents fluid communication between the longitudinal central lumen and the wire guide lumen; wherein the tube is configured such that a coated proximal tube portion provides a substantially patent path of fluid communication between the proximal tube end and the expandable balloon lumen; and wherein the tube further comprises a barrier sleeve around its outer circumference along a lengthwise region immediately adjacent the aperture of the wire guide lumen structure, said barrier sleeve configured to prevent fluid communication between the longitudinal central lumen and the wire guide lumen.