Delivery catheter for endovascular device
View Patent ↗Some embodiments relate in part to endovascular prostheses and delivery catheter systems and methods for deploying same. Embodiments may be directed more specifically to graft bodies having self-expanding members, including inflatable graft bodies, and catheters and methods for deploying same within the body of a patient.
1. A delivery system for an inflatable endoluminal prosthesis, comprising:
a delivery catheter comprising an elongate shaft including a proximal section and a fill tube, the fill tube including a fill tube lumen extending axially therein;
an endoluminal prosthesis releasably secured to the proximal section of the delivery catheter, the endoluminal prosthesis including an inflatable portion having an interior volume in fluid communication with an inflation port, wherein a proximal end of the fill tube is releasably coupled to the inflation port; and
a fill tube retention mechanism that releasably secures the fill tube lumen in fluid communication to the inflation port, comprising:
a tab disposed at a distal end of the endoluminal prosthesis in a substantially fixed relation to the inflation port and which includes an aperture that is separated from the inflation port by a predetermined distance,
a fitting secured to a proximal portion of the fill tube and which extends laterally from the fill tube, at least a portion of the fitting being sized to pass through the aperture such that the aperture closely fits an outer transverse surface of the fitting, the fitting being disposed a distance from a proximal end of the fill tube such that the fill tube may be engaged with the inflation port while the fitting is disposed within the aperture, the fitting having a passage therethrough, and
a release wire having an outer transverse dimension and axial bending stiffness that allows the release wire to pass through the passage and mechanically capture the tab to the fitting such that a portion of the tab is disposed between the release wire and the fill tube, and wherein the release wire may be retracted from the passage to release the portion of the tab.
2. The delivery system of claim 1 wherein the passage comprises an axial passage that is substantially parallel to the fill tube lumen.
3. The delivery system of claim 2 wherein the release wire extends proximally from the passage into a pocket in a body portion of the endoluminal prosthesis.
4. The delivery system of claim 1 wherein the release wire extends from the passage to a release mechanism disposed at a distal section of the delivery catheter, the release mechanism being configured to apply axial tension and displacement to the release wire in order to axially retract the release wire and release the fitting from the aperture.
5. The delivery system of claim 1 wherein the fill tube comprises a plurality of fittings and the tab comprises a plurality of corresponding apertures.
6. The delivery system of claim 1 wherein a body portion of the endoluminal prosthesis comprises PTFE.
7. The delivery system of claim 1 wherein the fill tube comprises a transverse dimension of about 1 mm to about 2 mm.
8. The delivery system of claim 1 wherein an outer transverse dimension of the fill tube is configured to slide within an inner lumen of the inflation port and provide a seal therebetween for viscous fluids.
9. The delivery system of claim 1 wherein the tab comprises an extension of a body portion of the endoluminal prosthesis.
10. The delivery system of claim 1 wherein the tab comprises an extension of a distal self-expanding member of the endoluminal prosthesis.
11. The delivery system of claim 10 wherein the distal self-expanding member and the tab comprise a metal.
12. The delivery system of claim 11 wherein the metal comprises NiTi.
13. A method of releasing a fill tube of a delivery catheter from an inflation port of an inflatable portion of an inflatable endoluminal prosthesis, comprising:
delivering an endoluminal prosthesis to a treatment site, the endoluminal prosthesis being releasably secured to a proximal section of a delivery catheter, the endoluminal prosthesis including an inflatable portion with an interior volume in fluid communication with an inflation port, a proximal end of a fill tube of the delivery catheter being releasably coupled to the inflation port with a fill tube retention mechanism that releasably secures a fill tube lumen of the fill tube in fluid communication with the inflation port, the fill tube retention mechanism comprising:
a tab disposed at a distal end of the endoluminal prosthesis in fixed relation to the inflation port and including an aperture that is separated from the inflation port by a predetermined distance,
a fitting secured to a proximal portion of the fill tube and which extends laterally from the fill tube, at least a portion of the fitting being sized to pass through the aperture such that the aperture closely fits an outer transverse surface of the fitting, the fitting being disposed a distance from the proximal end of the fill tube such that the fill tube may be engaged with the inflation port while the fitting is disposed within the aperture, the fitting having a passage therethrough, and
a release wire having an outer transverse dimension and axial bending stiffness that allows the release wire to pass through the passage and mechanically capture the tab to the fitting such that a portion of the tab is disposed between the release wire and the fill tube, and wherein the release wire may be retracted from the passage to release the portion of the tab; and
releasing the fitting from the tab by retracting the release wire from the passage such that the tab is no longer mechanically captured to the fitting with the portion of the tab disposed between the fill tube and the release wire.
14. The method of claim 13 wherein the release wire extends from the fitting to a distal end of the delivery catheter and is coupled to a release mechanism disposed at the distal end of the delivery catheter and further comprising applying axial tension and displacement to the release wire with the release mechanism in order to axially retract the release wire from the passage and release the fitting from the tab.
15. The delivery system of claim 13 wherein the passage comprises an axial passage that is substantially parallel to the fill tube lumen, and further comprising axially retracting the release wire from the passage to release the fitting from the tab.