Prosthesis deployment system retention device

• US 20050085890A1
• Filed: 10/12/2004
• Published: 04/21/2005
• Est. Priority Date: 10/15/2003
• Status: Active Grant

• Current Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Original Assignee: Cook Incorporated (Cook Group Incorporated)
• Inventors: Rasmussen, Erik E., Ohlenschlaeger, Bent, Schultz, Jens Vejby
• Granted Patent: US 7,666,219 B2
• Time in Patent Office: Days
• US Class Current: 623/1.110
• 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 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
• CPC Class Codes: A61F 2002/9505 having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument
• CPC Class Codes: A61F 2002/9511 the retaining means being filaments or wires
• CPC Class Codes: A61F 2002/9665 with additional retaining means

Abstract

An introducer for an expandable endovascular prosthesis having a self a self-expanding stent includes a proximal prosthesis positioning mechanism that has a retention device to retain the self-expanding stent and a control member to selectively release the retention device from the prosthesis. The retention device includes an opening forming a tapered cavity. The control member includes a plurality of loops coupled to the prosthesis and a trigger wire. The trigger wire passes through a first aperture of the retention device, through the plurality of loops, and through and a second aperture of the retention device to retain the loops.

Claims

1. An introducer for an expandable endovascular prosthesis having a proximal portion, a distal portion, and self-expanding stent, the introducer comprising:

a distal prosthesis positioning mechanism including a distal retention section and a first control member to selectively release the distal retention section from the prosthesis; and

a proximal prosthesis positioning mechanism including a retention device to retain the self-expanding stent and a second control member to selectively release the retention device from the prosthesis;

wherein the retention device includes an opening that extends longitudinally to form the surface of a cavity, the cavity having a first width at the opening and a second width at a longitudinal distance along the surface from the opening, the first width being greater than the second width.

2. The introducer of claim 1, wherein the surface has a linear cross section.

3. The introducer of claim 1, wherein the surface has a parabolic cross section.

4. The introducer of claim 1, wherein the surface has a circular cross section.

5. The introducer of claim 1, wherein first width is at least five percent greater than the second width.

6. The introducer of claim 1, wherein first width is at least ten percent greater than the second width.

7. The introducer of claim 1, further comprising a control arrangement for controlling the length of the prosthesis.

8. The introducer of claim 1, further comprising a rotational control arrangement by which the relative angular orientation of the proximal and distal portions of the prosthesis can be adjusted.

9. The introducer of claim 1, wherein the second control member includes a plurality of loops coupled to the prosthesis and a trigger wire that passes through a first aperture of the retention device, through the plurality of loops, and through a second aperture of the retention device to retain the loops between the trigger wire and the retention device.

10. An introducer for an expandable endovascular prosthesis having a proximal portion, a distal portion, and self-expanding stent, the introducer comprising:

a control section to be maintained external to the patient;

a proximal prosthesis positioning mechanism including a retention device to retain the self-expanding stent until the prosthesis is positioned at a desired site in a lumen; and

a control member to selectively release the retention device from the prosthesis, the control member comprising a plurality of loops coupled to the prosthesis and a trigger wire coupled to the control section that passes through a first aperture of the retention device, through the plurality of loops, and through a second aperture of the retention device to retain the loops between the trigger wire and the retention device until the prosthesis is suitably positioned.

11. The introducer of claim 10, wherein the loops comprise suture material.

12. The introducer of claim 10, wherein a cross-section of the prosthesis is circular, and the loops are separated by an angle of at least about 30 degrees.

13. The introducer of claim 10, wherein a cross-section of the prosthesis is circular, and the loops are separated by an angle of at least about 60 degrees.

14. The introducer of claim 10, wherein a cross-section of the prosthesis is circular, and the loops are separated by an angle of at least about 90 degrees.

15. The introducer of claim 10, wherein a cross-section of the prosthesis is circular, and the loops are separated by an angle of at least about 120 degrees.

16. The introducer of claim 10, further comprising a control arrangement for controlling a deployed length of the prosthesis.

17. The introducer of claim 10, further comprising a rotational control arrangement by which the relative angular orientation of the proximal and distal portions of the prosthesis can be adjusted.

18. The introducer of claim 10, further comprising a distal prosthesis positioning mechanism coupled between the control section and the proximal prosthesis positioning mechanism.

19. The introducer of claim 10, wherein the distal prosthesis positioning mechanism includes a distal attachment section, the control section comprises a tube, and the distal attachment section is coupled to the tube.

20. A method of placing a prosthesis into an internal lumen by means of an insertion assembly, the method including the steps of:

a. inserting the insertion assembly including the prosthesis into the internal lumen;

b. withdrawing a sheath from the insertion assembly to expose the prosthesis;

c. retaining a stent of the prosthesis in a retention device with a plurality of loops coupled to the prosthesis and a trigger wire that passes through a first aperture of the retention device, through the plurality of loops, and through a second aperture of the retention device to retain the loops between the trigger wire and the retention device;

d. removing the trigger wire;

e. moving the retention device proximally away from the prosthesis to release the stent from the retention device;

f. replacing the sheath onto the insertion assembly; and

g. retracting the insertion assembly.