ENDOGRAFT INTRODUCER AND A CAPSULE ASSEMBLY FOR AN ENDOGRAFT INTRODUCER

• US 20150216694A1
• Filed: 02/03/2015
• Published: 08/06/2015
• Est. Priority Date: 02/05/2014
• Status: Active Grant

• Current Assignee: Cook Medical Technologies, LLC (Cook Group Incorporated)
• Original Assignee: Cook Medical Technologies, LLC (Cook Group Incorporated)
• Inventors: Ducke, Werner D., Hartley, David Ernest, Roeder, Blayne A., O'Brien, David Sean
• Granted Patent: US 9,867,729 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
• CPC Class Codes: A61F 2002/9665 with additional retaining means

Abstract

A capsule assembly for an endograft introducer is disclosed. The assembly comprises: a capsule retriever having a plug portion and a tail portion, the plug portion having a lead-in surface, the tail portion having an elongate body extending proximally from the plug portion to an end stop feature receiver; a capsule tube having an end stop feature at a proximal end thereof and terminating in a distal end, the end stop feature and the end stop receiver arranged such that proximal movement of the capsule tube relative to the plug portion is limited; and a capsule cavity inside the capsule tube, a proximal end of a prosthesis being receivable in the cavity. The capsule tube is slidably movable with respect to the capsule retriever to a position in which the distal end of the capsule tube is adjacent to the lead-in surface of the plug portion.

Claims

1. A capsule assembly for an endograft introducer, the capsule assembly comprising:

a capsule retriever having a plug portion and a tail portion, the plug portion having a lead-in surface, the tail portion having an elongate body extending proximally from the plug portion to an end stop feature receiver;

a capsule tube having an end stop feature at a proximal end thereof and terminating in a distal end; and

a capsule cavity inside the capsule tube, a proximal end of a prosthesis being receivable in the cavity,

wherein the capsule tube is slidably movable with respect to the capsule retriever from a first position in which the distal end of the capsule tube surrounds an opening into the capsule cavity to a second position in which the distal end of the capsule tube is adjacent to the lead-in surface of the plug portion and the end stop feature and end stop feature receiver are engaged.

2. The capsule assembly as claimed in claim 1, wherein the end stop feature comprises a capsule wall, the capsule wall defining a wall aperture.

3. The capsule assembly as claimed in claim 1, wherein the lead-in surface includes a frusto-conical portion.

4. The capsule assembly as claimed in claim 1, wherein the plug portion comprises a landing surface proximally adjacent to the lead-in surface, the landing surface slidably engaging the capsule tube.

5. The capsule assembly as claimed in claim 1, wherein the tail portion comprises a tail lock, the tail lock arranged to prevent the lead-in surface of the capsule plug portion re-entering the capsule tube from the second position.

6. The capsule assembly as claimed in claim 5, wherein the tail lock comprises a barb, the barb extending proximally from the elongate body and terminating with a barb abutment surface, the barb abutment surface resiliently moveable from a relaxed position to a deflected position, the deflected position enabling the abutment surface to pass through the wall aperture.

7. The capsule assembly as claimed in claim 6 wherein, when the capsule tube is in the second position, the abutment surface is prevented from re-entering the wall aperture by abutment of the abutment surface against the end wall.

8. The capsule assembly as claimed in claim 7, wherein the tail portion comprises a tail tube, the tail tube defining a tail lumen.

9. The capsule assembly as claimed in claim 8, wherein the tail tube comprises a pair of opposed resiliently flexible tabs, each tab forming a said barb.

10. The capsule assembly as claimed in claim 9, wherein the tail tube comprises a pair of opposed flanges, the flanges forming said end stop receiver.

11. The capsule assembly as claimed in claim 10, wherein the barbs and the flanges and the tube are a unitary assembly.

22. An endograft introducer comprising a nose cone dilator and a capsule assembly at a proximal end, a guide wire catheter extending distally from the nose cone dilator though the capsule assembly, a sheath and a handle, to a distal end, the capsule assembly as defined by claim 1.

12. A system for delivering and deploying an expandable prosthesis, the system comprising:

a sheath having a lumen;

a delivery catheter including a longitudinally extending guide wire catheter, the delivery catheter slidably disposed within the lumen of the sheath;

an expandable prosthesis disposed on a proximal portion of the delivery catheter;

a haemostatic device sealingly engaging the delivery catheter; and

a capsule assembly at the proximal portion of the delivery catheter, the capsule assembly comprising;

a capsule retriever having a plug portion and a tail portion, the plug portion having a lead-in surface, the tail portion having an elongate body extending proximally from the plug portion to an end stop feature receiver;

a capsule tube having an end stop feature at a proximal end thereof and terminating in a distal end; and

a capsule cavity inside the capsule tube, a proximal end of a prosthesis being receivable in the cavity,

wherein the capsule tube is slidably movable with respect to the capsule retriever from an first position in which the distal end of the capsule tube surrounds an opening into the capsule cavity to a second position in which the distal end of the capsule tube is adjacent to the lead-in surface of the plug portion and the end stop feature and end stop feature receiver are engaged.

13. The system as claimed in claim 12 comprising a plug sleeve joined to the capsule plug portion and mounted coaxially around the guide wire catheter, the guide wire catheter slidably movable with respect to the plug sleeve and the capsule plug portion from the first′

position to the second position.

14. The capsule assembly as claimed in claim 12, wherein the end stop feature comprises a capsule wall, the capsule wall defining a wall aperture.

15. The capsule assembly as claimed in claim 12, wherein the tail portion comprises a tail lock, the tail lock arranged to prevent the lead-in surface of the capsule plug portion re-entering the capsule tube from the second position.

16. The capsule assembly as claimed in claim 15, wherein the tail lock comprises a barb, the barb extending proximally from the elongate body and terminating with a barb abutment surface, the barb abutment surface resiliently moveable from a relaxed position to a deflected position, the deflected position enabling the abutment surface to pass through the wall aperture.

17. The capsule assembly as claimed in claim 16 wherein, when the capsule tube is in the second position, the abutment surface is prevented from re-entering the wall aperture by abutment of the abutment surface against the end wall.

18. The capsule assembly as claimed in claim 17, wherein the tail portion comprises a tail tube, the tail tube defining a tail lumen.

19. The capsule assembly as claimed in claim 18, wherein the tail tube comprises a pair of opposed resiliently flexible tabs, each tab forming a said barb.

20. The capsule assembly as claimed in claim 19, wherein the tail tube comprises a pair of opposed flanges, the flanges forming said end stop receiver.

21. A system for delivering and deploying an expandable prosthesis, the system comprising:

a sheath having a lumen;

a delivery catheter including a longitudinally extending guide wire catheter, the delivery catheter slidably disposed within the lumen of the sheath;

an expandable prosthesis disposed on a proximal portion of the delivery catheter;

a haemostatic device sealingly engaging the delivery catheter; and

a capsule assembly at the proximal portion of the delivery catheter, the capsule assembly comprising;

a capsule tube terminating in a distal end;

a proximal capsule end wall, the end wall defining a wall aperture and an end stop feature;

a capsule cavity generally bounded by the capsule tube and the proximal capsule end wall, a proximal end of a prosthesis being receivable in the cavity; and

a capsule retriever having a plug portion and a tail portion, the plug portion having a lead-in surface, the tail portion having an elongate body extending proximally from the plug portion through the wall aperture and having an end stop feature receiver, the end stop feature and end stop feature receiver mutually engagable.