Patent ID: 8617253

Claim:
A vascular wound closure device, comprising: an elongate catheter sized and configured to extend partially through a vascular puncture; an elongate delivery tube disposed about the catheter so that the catheter extends through the delivery tube and a distal end of the delivery tube approximates the catheter, an inner surface of the delivery tube proximal of the distal end being spaced from the catheter so as to define a delivery tube chamber between the catheter and the delivery tube, the delivery tube chamber tapering so that a diameter of the delivery tube chamber decreases moving distally along at least a portion of a length of the chamber; a multi-layer closure portion disposed circumferentially about the elongate catheter, the closure portion being movable distally over the elongate catheter; a first member of the closure portion configured to engage a blood vessel wall and having an outer diameter that is greater than a diameter of the vascular puncture, the first member comprising an aperture having an aperture diameter and an aperture surface; a second member of the closure portion comprising a hemostatic material; and a push member that is movable longitudinally over the catheter, the push member configured to engage and apply an advancement force to at least one of the first and second members so as to move the first and second members distally over the catheter; wherein the closure portion is disposed within the delivery tube chamber at a staging position at which the outer diameter of the first member is substantially the same as the diameter of the tapering delivery tube chamber so that the first member is spaced proximally from a distal end of the delivery tube chamber; and wherein at least part of the first member is arranged distal of the second member, and the elongate catheter extends through the first member aperture so that the aperture surface of the first member engages an outer surface of the elongate catheter, the first member aperture diameter being sized and configured so that the aperture surface slidably engages the outer surface of the elongate catheter sufficient to create a seal between the aperture surface and the catheter outer surface so that the hemostatic material of the second member is prevented from moving distally between the first member and the outer surface of the catheter.