Patent ID: 7377931

Claim:
A system for treating a vascular condition, comprising: a catheter having at least one lumen extending therethrough; a stem received within a distal portion of the catheter lumen, the stem including a proximal body portion, a sealing portion distal to the body portion, and a shoulder portion distal to the sealing portion; a sealing member positioned on the stem, wherein the sealing member is movable with hydrodynamic force from an initial air-release position on the proximal body portion of the stem to a sealed position on the sealing portion of the stem wherein in the air-release position the sealing member allows air in the at least one lumen to be purged out of the distal portion of the lumen and in the sealed position the sealing member prevents air from re-entering the distal portion of the lumen; and an inflatable balloon operably attached to a distal portion of the catheter.