Device for loading a self-expandable prosthesis into a sheath

• US 8,220,121 B2
• Filed: 09/15/2008
• Issued: 07/17/2012
• Est. Priority Date: 09/14/2007
• Status: Active Grant

• Current Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Original Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Inventors: Hendriksen, Per, Hemmingsen, Allan G., Clausen, Jacob Lund
• Primary Examiner(s): Wilson, Lee D
• Application Number:
  US12/283,718
• Publication Number:
  US 20090076585A1
• Time in Patent Office: 1,401 Days
• Field of Search: 292/35, 292/55, 292/63, 292/71, 292/80, 254/134.3 FT
• US Class Current: 29/235
• 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 while protecting the sheath from damage.

Claims

1. An apparatus for loading a self-expandable prosthesis into a protective sheath having an interior sheath radius, the apparatus comprising:

a passageway through the apparatus extending along an axis and having a proximal and a distal end, the passageway comprising;

a distal section and a proximal section adjacent the distal section;

wherein the distal section has an interior radius that decreases with distance from the distal end to a first value adjacent a rim of the loading apparatus, at least one portion of the rim having an exterior radius that is smaller than the interior sheath radius, the rim extending axially into the proximal section with the at least one portion.

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

3. The apparatus according to claim 1, wherein the rim is annular in shape.

4. The apparatus according to claim 1, wherein the portion of the loading apparatus surrounding the distal section of the 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 the sheath, the loading device comprising;

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

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

the passageway further comprising a proximal section harboring the sheath;

the rim extending axially so as to engage with the interior of the distal end of the sheath with a portion of the rim having an exterior radius smaller than the interior radius of the sheath and prevent distal movement of the sheath relative to the device.

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

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

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

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

10. The assembly according to claim 9, further comprising a hermetically sealed container sealing the distal end of the loading device.

11. A system for loading a self-expandable prosthesis into a protective sheath, the system 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 the sheath, the loading device comprising;

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

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

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

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

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

13. The system according to claim 12, wherein the rim is formed as an annular lip.

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

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

16. The system according to claim 11 further comprising a hermetically sealed container sealing the distal end of the loading device.