Patent ID: 7416557

Claim:
A catheter for use in forming a unidirectional valve in a vein, the catheter comprising: a catheter shaft; at least two expandable balloons positioned on the catheter shaft; an expandable support member, the expandable support member being disposed about one of the balloons in a reduced state, the expandable support member being expandable from the reduced state to an expanded state; and an expandable saddle member, the expandable saddle member including a first biasing region, a second biasing region and at least one end region, the expandable saddle member having a reduced state, a partially expanded state and a fully expanded state, where in the reduced state for the expandable saddle member the first biasing region, the second biasing region and at least one end region are engaged to the catheter shaft, in the partially expanded state the first biasing region and the second biasing region are free to expand radially outward from the catheter shaft but the at least one end region remains engaged to the catheter shaft, and in the fully expanded state the first biasing region, the second biasing region and the at least one end region are all free to expand radially outward from the catheter shaft.