Patent ID: 8152786

Claim:
A method for collecting flow from a blood vessel comprising: a. selecting a collection member having: i. an elongated, flexible tubular member terminating at a distal end; ii. an annular sealing member secured to said tubular member spaced from said distal end; iii. a collection lumen with a fluid inlet distal to said sealing member; iv. a proximal end adapted to be connected to a source of suction for applying a suction to said collection lumen; b. placing said distal end in a blood vessel with antegrade flow within said vessel flowing in a direction from said distal end toward said sealing member and with said sealing member spaced from opposing surface of said vessel in an absence of a suction applied to said collection lumen; c. applying a suction to said collection lumen in an amount sufficient to draw blood from said vessel through said fluid inlet and into said collection lumen and further sufficient to occlude said vessel by causing said vessel to radially migrate into sealing engagement with said annular sealing member.