Method and apparatus for the endoluminal delivery of intravascular devices
A dual-balloon delivery catheter system includes a carrier segment that is a lead/carrier balloon or mandrel at a distal portion of a catheter. The carrier segment is sequentially arrayed with a more proximally positioned delivery segment, wherein the delivery segment is a delivery balloon or mandrel. The first carrier segment expands the stent-valve a sufficient amount to receive the delivery segment after the carrier segment is moved away from the sent-valve. The delivery segment is then positioned at the target site and the stent-valve is then deployed.
1. A system for treating a native heart valve in a patient using endoluminal delivery through vasculature of a patient to a native heart valve seat, the system comprising:
a stent-valve;
an outer delivery sheath including a distal section, wherein at least a portion of the outer delivery sheath is sized for insertion into the vasculature of the patient, wherein at least a portion of the distal section of the outer delivery sheath is expandable and comprises a plurality of piezo-ceramic elements configured to expand the distal section of the outer delivery sheath upon electrically activating the plurality of piezo-ceramic elements;
a carrier segment located at a distal portion of a catheter shaft, the carrier segment having an outer surface sized to temporarily hold the stent-valve in the distal section of the outer delivery sheath, wherein at least a portion of the catheter shaft is located within and coaxial to the outer delivery sheath; and
a delivery segment located coaxially to the outer delivery sheath, the delivery segment having an outer surface sized to radially fit within the stent-valve after detaching the stent-valve from the carrier segment when the stent-valve resides within the distal section of the outer delivery sheath, wherein the delivery segment is configured to deploy the stent-valve at the location of the native heart valve seat.
2. The system of claim 1 , wherein the distal section includes at least one of an internal projection and a narrowed area extending radially inward from an interior surface of the distal section.
3. The system of claim 1 , wherein a portion of an internal surface of the outer delivery sheath further comprises a guide for retaining at least a portion of a longitudinally extending element configured to selectively manipulate at least a part of the outer delivery sheath or a structure coaxial to the outer delivery sheath.
4. The system of claim 1 , wherein a portion of an internal surface of the outer delivery sheath further comprises a guide, the guide comprising at least one of:
(a) a lumen; and
(b) a grommet;
wherein the guide retains at least one control line for selective retention of the stent-valve.
5. The system of claim 1 , wherein the carrier segment is situated upon the catheter shaft, and wherein the delivery segment is associated with a delivery segment shaft that is coaxial to the catheter shaft and axially moveable relative to the catheter shaft.
6. The system of claim 1 , wherein the carrier segment is an expandable balloon having an expanded diameter smaller than an expanded diameter for the delivery segment.
7. The system of claim 1 , wherein the delivery segment is an expandable balloon having an expanded diameter larger than an expanded diameter for the carrier segment.
8. The system of claim 1 , wherein at least one of the carrier segment and the delivery segment is a mandrel.
9. The system of claim 1 , wherein the mandrel is expandable by mechanical or electromechanical means.
10. The system of claim 1 , wherein the delivery segment is located axially proximal to the carrier segment.
11. The system of claim 1 , wherein the delivery segment includes a magnet to aid in capture and retention of the stent-valve on the delivery segment.