Vascular wound closure device and method
AssigneeLoma Linda University Medical Center
InventorsYong Hua Zhu, Wolff M. Kirsch
Life of this patent
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Abstract
A method and apparatus for closing a vascular wound includes an apparatus that can be threaded over a guidewire into place at or adjacent the wound. The apparatus includes a chamber that encloses a hemostatic material therein. When the apparatus is positioned adjacent the wound as desired, the hemostatic material is deployed from the chamber. A blocking member distal of the hemostatic material functions as a barrier to prevent the hemostatic material from entering the wound. Blood contacts the hemostatic material, and blood clotting preferably is facilitated by a hemostatic agent within the material. Thus, the vascular puncture wound is sealed by blood clot formation.
Claims17
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.
Dependencies are inferred from the claim text.