Device for loading a self-expandable prosthesis into a sheath

• US 20090076585A1
• Filed: 09/15/2008
• Published: 03/19/2009
• Est. Priority Date: 09/14/2007
• Status: Active Grant

• Current Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Original Assignee: Cook Incorporated (Cook Group Incorporated), William Cook Europe ApS (Cook Group Incorporated)
• Inventors: Hemmingsen, Allan G., Hendriksen, Per, Clausen, Jacob Lund
• Granted Patent: US 8,220,121 B2
• Time in Patent Office: Days
• US Class Current: 623/1.120
• CPC Class Codes: A61F 2/01 Filters implantable into blood vessels
• CPC Class Codes: A61F 2/0105 Open ended, i.e. legs gathered only at one side
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/9522 Means for mounting a stent or stent-graft onto or into a placement instrument
• CPC Class Codes: Y10T 29/49826 Assembling or joining
• CPC Class Codes: Y10T 29/49863 with prestressing of part
• CPC Class Codes: Y10T 29/53 Means to assemble or disassemble
• CPC Class Codes: Y10T 29/53657 to apply or remove a resilient article [e.g., tube, sleeve, etc.]
• CPC Class Codes: Y10T 29/53913 Aligner or center

Abstract

An assembly comprising: a protective sheath and a loading device for loading a self-expandable prosthesis into said sheath, the loading device having a conical distal section, which radially compresses the prosthesis and an annular lip that engages with the interior of the distal end of said sheath to guide the prosthesis into the sheath whilst protecting the sheath from damage.

Claims

1. Apparatus for loading a self-expandable prosthesis into a protective sheath comprising:

a passageway through said device extending along an axis and having a proximal and a distal end, said passageway comprising;

a distal section and a proximal section adjacent said distal section;

wherein the radius of said distal section decreases with distance from the distal end to a first value adjacent a rim of said loading apparatus, said rim extending axially into said proximal section.

2. Apparatus according to claim 1, wherein said proximal section of said passageway has a radius of a second value greater than the exterior radius of said rim.

3. Apparatus according to claim 1, wherein said rim is annular in shape.

4. Apparatus according to claim 1, wherein the portion of said loading apparatus surrounding the distal section of said passageway is substantially conical.

5. An assembly comprising:

a protective sheath having interior and exterior radii and a distal end; and

a loading device for loading a self-expandable prosthesis into said sheath, the loading device comprising;

a passageway through said device extending along an axis and having a proximal and a distal end, said passageway comprising;

a distal section where the radius decreases with distance from the distal end to a first value at a rim of said loading device, the first value being less than the interior radius of said sheath;

the passageway further comprising a proximal section harbouring said sheath;

said rim extending axially so as to engage with the interior of the distal end of said sheath and prevent distal movement of said sheath relative to said device.

6. Apparatus according to claim 5, wherein said rim prevents said prosthesis from contacting the distal end of said sheath during loading.

7. Apparatus according to claim 5, wherein said proximal section of said passageway has a radius at least equal to the exterior radius of said sheath.

8. Apparatus according to claim 5, wherein said rim is formed as an annular lip having an exterior radius at most equal to the interior radius of said sheath.

9. Apparatus according to claim 5, further comprising a self-expandable prosthesis.

10. Apparatus according to claim 9 contained within hermetically sealed container.

11. An assembly comprising:

a self-expandable prosthesis releasably attached to the distal end of a wire;

a protective sheath having interior and exterior radii and a distal end; and

a loading device for loading a self-expandable prosthesis into said sheath, the loading device comprising;

a passageway through said device extending along an axis and having a proximal and a distal end;

a conical section surrounding a distal portion of said passageway, the conical section narrowing with distance from the distal end of said passageway

a rim extending located proximally to said conical section, the rim extending axially so as to engage with the interior of the distal end of said sheath and prevent distal movement of said sheath relative to said device;

wherein, said wire extends axially through said passageway and along the lumen of said protective sheath and wherein said rim prevents said prosthesis from contacting the distal end of said sheath during loading.

12. Apparatus according to claim 11, wherein said loading device further comprises a tubular section extending along said axis from said conical section, said tubular section radially surrounding said rim.

13. Apparatus according to claim 12, wherein said rim is formed as an annular lip.

14. Apparatus according to claim 13, wherein said rim has an exterior radius at most equal to the interior radius of said sheath.

15. Apparatus according to claim 14, wherein the exterior radius of said rim decreases with distance from the distal end of the passageway so that the radially exterior surface is substantially frustoconical.

16. Apparatus according to claim 11 contained within a hermetically sealed container.

17. A method for loading a self-expandable prosthesis into a protective sheath, the method comprising the steps of:

providing a loading device having a passageway extending along an axis and having a proximal and a distal end, wherein the radius of said passageway decreases with distance from the distal end to a first value adjacent a rim of said loading device;

engaging said rim with the interior of the distal end of said protective sheath;

urging said prosthesis proximally from a distal end of said passageway through said passageway so as to radially compress said prosthesis and into sheath, said rim serves to prevent contact between the prosthesis and the distal end of the sheath.

18. A method according to claim 17, further comprising releasably attaching said prosthesis to the distal end of a wire, the wire passing through said passageway and said sheath;

wherein, said urging is achieved by pulling said wire proximally.

19. A method according to claim 17, wherein said rim prevents said prosthesis from contacting the interior of said sheath during said urging step until the entire length of the prosthesis is within the lumen of the sheath.