Axially activated hemostasis valve with lumen size selection

The present invention generally relates to the field of minimally invasive medicine. More particularly, the present invention relates to those devices, commonly known as y-adapters, which are used to prevent blood from exiting a patient during a minimally invasive procedure. Such procedures include but are not limited to angioplasty, atherectomy, stenting, angiography, venous filtration, liquid infusion, dialysis, and intravascular ultrasound. Those skilled in the art will recognize the benefits of applying the present invention to similar fields not discussed herein. A hemostasis valve which has a varying diameter. The hemostasis valve is actuated by a mechanism which provides mechanical advantage. Actuation of the hemostatis valve provides selective incremental sizing such that the valve will fit a variety of different intravascular devices.