Patent ID: 8002742

Claim:
An occlusion device for sealing a puncture through tissue, comprising: an elongate tubular member comprising a proximal end, a distal end sized for insertion into a puncture, a lumen extending at least partially between the proximal and distal ends, and an expandable occlusion element carried on a distal region of the tubular member, the occlusion element having an interior communicating with a distal opening in the lumen, the lumen having a substantially uniform diameter between the proximal end and the distal region; and an elongate piston member comprising a distal end disposed within the lumen and spaced proximally from the occlusion member, the piston member distal end movable within the lumen of the tubular member from a proximal position to a distal position adjacent the distal region for delivering fluid within the lumen beyond the piston member distal end into, and from the distal position towards the proximal position for drawing fluid out of, the interior of the occlusion element to thereby expand and collapse the occlusion element, respectively, a fluid-tight seal being provided between the piston member and the tubular member to substantially seal the lumen such that fluid within the lumen does not leak between the tubular member and the piston member when the piston member is moved between the proximal and distal positions, the piston member having a proximal end extending from a proximal opening of the tubular member lumen.