DELIVERY CATHETER FOR ENDOVASCULAR DEVICE

• US 20130268048A1
• Filed: 03/15/2013
• Published: 10/10/2013
• Est. Priority Date: 04/06/2012
• Status: Active Grant

• Current Assignee: Endologix
• Original Assignee: Trivascular Incorporated
• Inventors: Watson, James, Li, Cheng, Chobotov, Michael V., Poppe, Carl, Morehous, Reva, Woodson, Teresa
• Granted Patent: US 9,498,363 B2
• Time in Patent Office: Days
• US Class Current: 623/1.11
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/9517 handle assemblies therefor
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2002/077 having means to fill the space between stent-graft and aneurysm wall, e.g. a sleeve
• CPC Class Codes: A61F 2002/9511 the retaining means being filaments or wires
• CPC Class Codes: A61F 2002/9665 with additional retaining means
• CPC Class Codes: A61F 2250/0003 having an inflatable pocket filled with fluid, e.g. liquid or gas
• CPC Class Codes: F04C 2270/0421 Controlled or regulated

Abstract

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.

Claims

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 including a fill tube lumen extending axially within the fill tube;

an endoluminal prosthesis releasably secured to the proximal section of the delivery catheter, the endoluminal prosthesis including an inflatable portion with an interior volume in fluid communication with a inflation port, and a proximal end of the fill tube of the catheter releasably coupled to the inflation port; and

a fill tube retention mechanism that releasably secures the fill tube lumen of the fill tube in fluid communication with the inflation port, comprising;

a tab which is disposed at a distal end of the endoluminal prosthesis in substantially fixed relation to the inflation port and which includes an aperture in the tab which is separated from the inflation port by a predetermined distance,

a fitting secured to a proximal portion of the fill tube of the delivery catheter which extends laterally from the fill tube, which includes at least a portion that is sized to pass through the aperture in the tab, which is disposed a distance from a proximal end of the fill tube that allows the fill tube to be engaged with the inflation port while the fitting is disposed within the aperture, and which has a passage through the fitting, and

a release wire including an outer transverse dimension and axial bending stiffness that allows the release wire to pass through the passage of the fitting and mechanically capture the tab to the fitting with the tab disposed between the release wire and the fill tube and the release wire disposed in the passage.

2. The delivery system of claim 1 wherein the aperture of the tab of the endoluminal prosthesis closely fits an outer transverse surface of the fitting.

3. The delivery system of claim 1 wherein the passage of the fitting comprises an axial passage which is substantially parallel to the lumen of the fill tube.

4. The delivery system of claim 3 wherein the release wire extends proximally from the passage of the fitting into a pocket in a body portion of the endoluminal prosthesis.

5. The delivery system of claim 1 wherein the release wire extends from the passage in the fitting to a release mechanism disposed at a distal section of the delivery catheter which is 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 of the tab.

6. The delivery system of claim 1 wherein the fill tube comprises a plurality of fittings and the tab comprises a plurality of corresponding apertures.

7. The delivery system of claim 1 wherein a body portion of the endoluminal prosthesis comprises PTFE.

8. The delivery system of claim 1 wherein the fill tube comprises a transverse dimension of about 1 mm to about 2 mm.

9. 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.

10. The delivery system of claim 1 wherein the tab comprises an extension of a body portion of the endoluminal prosthesis.

11. The delivery system of claim 1 wherein the tab comprises an extension of a distal self-expanding member of the endoluminal prosthesis.

12. The delivery system of claim 11 wherein the distal self-expanding member and the tab comprises a metal.

13. The delivery system of claim 12 wherein the metal comprises NiTi.

14. A method of releasably securing a fill tube of a delivery catheter to a 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 a 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 the fill tube lumen of the fill tube in fluid communication with the inflation port, comprising;

a flexible tab disposed at a distal end of the endoluminal prosthesis in fixed relation to the inflation port and including an aperture in the tab which is separated from the inflation port by a predetermined distance,

a fitting secured to a proximal portion of the fill tube of the delivery catheter which extends laterally from the fill tube, which includes at least a portion that is sized to pass through the aperture in the tab, which is disposed a distance from a proximal end of the fill tube that allows the fill tube to be engaged with the inflation port while the fitting is disposed within the aperture, and which has a passage through the fitting which is positioned so as to allow the tab to be disposed between the release wire and the fill tube with the release wire disposed in the passage, and

a release wire including an outer transverse dimension and axial bending stiffness that allows the release wire to pass through the passage of the fitting and mechanically capture the tab to the fitting; and

releasing the fitting from the tab by retracting the release wire from the passage such that the tab is no longer mechanically captured over the fitting between the fill tube and the release wire.

15. The method of claim 14 wherein the release wire extends from the fitting to a distal end of the catheter and is coupled to a release mechanism disposed at a distal end of the delivery catheter and further comprising applying axial tension and displacement to the release wire in order to axially retract the release wire and release the fitting from the aperture of the tab.

16. The delivery system of claim 14 wherein the passage of the fitting comprises an axial passage which is substantially parallel to the lumen of the fill tube and further comprising axially retracting the release wire to release the fill tube from the inflation port.

17. A delivery catheter for delivery of an endoluminal prosthesis, comprising:

an elongate shaft with sufficient column strength for percutaneous advancement within a patient'"'"'s body lumen, the elongate shaft including a proximal section and a lumen extending therein;

a plurality of releasable belts disposed on the proximal section of the elongate shaft and configured to releasably constrain a self-expanding member of an endoluminal prosthesis;

a plurality of elongate release members in communication with a distal end of the elongate shaft and including a proximal section configured to releasably secure at least one respective releasable belt while said releasable belt is in a configuration that constrains at least a portion of an endoluminal prosthesis; and

the elongate shaft comprising an elongate release wire sleeve disposed within the lumen extending within the elongate shaft, the elongate release wire sleeve including a low friction material and extending from a distal section to a proximal section of the elongate shaft, said elongate release wire sleeve comprising a separate lumen for each release member.

18. The delivery catheter of claim 17 wherein the low friction material of the elongate release wire sleeve comprises a fluoropolymer.

19. The delivery catheter of claim 18 wherein the fluoropolymer of the elongate release wire sleeve comprises PTFE.

20. The delivery catheter of claim 19 wherein the PTFE of the elongate release wire sleeve comprises a shore hardness of about 40 D to about 70 D

21. The delivery catheter of claim 17 wherein the elongate release member comprises an elongate release wire.

22. The delivery catheter of claim 17 wherein the delivery catheter is configured to deliver an inflatable endovascular prosthesis and wherein the delivery catheter further comprises a fill tube including a fill tube lumen extending axially within the elongate shaft.

23. The delivery catheter of claim 17 wherein the elongate shaft comprises an elongate multi-lumen member extending from a distal section of the elongate shaft to a proximal section of the elongate shaft, the multi-lumen member comprising a guidewire lumen and a lumen within which the release wire sleeve is disposed.