Abstract: A perfusion shunt device is used in conjunction with balloon catheters to provide blood perfusion across an inflated balloon in a blood vessel. The perfusion shunt device comprises a flexible conduit structure having one or more blood perfusion paths formed from a proximal end to a distal end thereof. The flexible conduit structure is usually attached directly or indirectly to a proximal shaft structure. Discrete anchors or expansible sleeves or cages are provided for locating the conduit structure over the balloon on the catheter. The flexible conduit structure will not be directly attached to the balloon, but rather will be secured at locations distal to an proximal of the balloon. In this way, constriction and distortion of the conduit structure and/or balloon resulting from balloon expansion are minimized. The device may be loaded over a conventional angioplasty balloon catheter within or outside of the blood vessel being treated, either before or after an angioplasty procedure.