Stretchable stent and delivery

• US 9,962,274 B2
• Filed: 07/13/2012
• Issued: 05/08/2018
• Est. Priority Date: 04/09/2007
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Kusleika, Rich, Duchon, Doug, Tatalovich, Joe
• Primary Examiner(s): MILES, JONATHAN WADE
• Application Number:
  US13/548,428
• Publication Number:
  US 20130006348A1
• Time in Patent Office: 2,125 Days
• Field of Search: 623 115, 623 116, 623 118, 623 119, 623 12, 623 121
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• 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 2002/91525 within the whole structure different bands showing different meander characteristics, e.g. frequency or amplitude
• CPC Class Codes: A61F 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2210/0057 stretchable
• CPC Class Codes: A61F 2220/005 using adhesives
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• CPC Class Codes: A61F 2230/0054 V-shaped

Abstract

An implant delivery catheter enables permanent modification of the implant length in the vicinity of the treatment site prior to radial expansion thereof. The implant is releasable carried between inner and outer tubular members of the delivery catheter which, upon repositioning relative to one another using an actuator mechanism, impart any of tensile, compressile or torquing forces to the implant causing permanent modification of the implant length. In one embodiment, the circumference of the implant is substantially similar both before and after modification of the implant length. In another embodiment, the implant includes a plurality of strut sections interconnected by bridges which are capable of the deformation along the longitudinal axis of the implant.

Claims

1. An implant for insertion into a body lumen comprising:

an implant member including a plurality of cells at least partially defined by a plurality of struts and a plurality of bridges, selected of the cells disposed at proximal and distal ends of the implant and having terminal ends attached thereto, and the implant member having an initial length L1 extending along a longitudinal axis and an initial circumference C1 extending circumferentially about the longitudinal axis, wherein the implant member assumes a deformation circumference C2 having a value within 0% to 10% of a value of the initial circumference C1 following application of a deformation force substantially to the terminal ends thereof, wherein the deformation force substantially to the terminal ends results in the implant member assuming a permanent deformation length L2.

2. The implant of claim 1 wherein the deformation length L2 has a value between 3% to 50% greater than a value of the initial length L1.

3. The implant of claim 1, wherein the implant member is dimensioned to assume the deformation circumference C2 following application of the deformation force, the deformation force being substantially parallel to the longitudinal axis.

4. The implant of claim 1 wherein the deformation length L2 has a value between 10% to 50% greater than a value of the initial length L1.

5. The implant of claim 1 wherein the deformation circumference C2 has a value within 0% to 5% of a value for the initial circumference C1.

6. The implant of claim 1 wherein the implant member is a balloon-expandable stent.

7. The implant of claim 1 wherein two adjacent struts define a pair of struts, and wherein a first pair of struts is radially offset with respect to a second pair of struts, and wherein a bending region interconnects one strut from the first pair of struts and one strut from the second pair of struts.

8. The implant of claim 7 wherein a portion of the bending region is longitudinally aligned with a portion of at least one bridge.

9. The implant of claim 1 wherein a percentage of metal coverage of the implant at its initial length L1 is about 14%, and the percentage of metal coverage of the implant at its deformation length L2 is about 18%.

10. An implant for insertion into a body lumen comprising:

a tubular body extending for an initial length L1 along a longitudinal axis and having an initial circumference C1 about the longitudinal axis, the tubular body comprising a plurality of strut structures and a plurality of bridge structures collectively defining a plurality of cells, selected of the plurality of cells being disposed at proximal and distal ends of the tubular body and having terminal ends attached thereto, one of the plurality of strut structures and bridge structures being capable of deformation in a direction tending toward the longitudinal axis of the tubular body when a force substantially parallel to the longitudinal axis is applied to the terminal ends, wherein the application of one of tensile and compressive forces to the terminal ends results in the tubular body assuming a permanent deformation length L2 and a deformation circumference C2, and wherein the deformation circumference C2 has a value within 0% to 10% of a value for the initial circumference C1.

11. The implant of claim 10 wherein the deformation length L2 has a value between 3% to 50% greater than a value of the initial length L1.

12. The implant of claim 11 wherein the deformation length L2 has a value between about 10% to 50% greater than a value of the initial length L1.

13. The implant of claim 10 wherein the deformation length L2 has a value between about 20% to about 50% greater than a value of the initial length L1.

14. The implant of claim 10 wherein the deformation circumference C2 has a value within 0% to 5% of a value for the initial circumference C1.

15. The implant of claim 10 wherein the deformation circumference C2 has a value within 0% to 3% of a value for the initial circumference C1.

16. The implant of claim 10, wherein the circumference C2 is substantially equal to the circumference C1.

17. The implant of claim 10 wherein a yield force of the plurality of bridge structures normal to the longitudinal axis is less than a yield force of the plurality of strut structures normal to the longitudinal axis.

18. The implant of claim 10 wherein a yield force of the plurality of bridge structures normal to the longitudinal axis is less than a yield force of the terminal ends normal to the longitudinal axis.

19. The implant of claim 10 wherein a cross sectional area of the plurality of bridge structures normal to the longitudinal axis is less than a cross sectional area of the plurality of strut structures normal to the longitudinal axis.

20. The implant of claim 10 wherein a cross sectional area of the plurality of bridge structures normal to the longitudinal axis is less than a cross sectional area of the plurality of terminal ends normal to the longitudinal axis.

21. The implant of claim 10 wherein the tubular body is a stent.

22. The implant of claim 21 wherein the stent is self expandable.

23. The implant of claim 21 wherein the stent is balloon expandable.

24. The implant of claim 10 wherein two adjacent struts define a pair of struts, and wherein a first pair of struts is radially offset with respect to a second pair of struts, and wherein a bending region interconnects one strut from the first pair of struts and one strut from the second pair of struts.

25. The implant of claim 24 wherein a portion of the bending region is longitudinally aligned with a portion of at least one bridge.

26. The implant of claim 10 wherein a percentage of metal coverage of the implant at its initial length L1 is about 14%, and the percentage of metal coverage of the implant at its deformation length L2 is about 18%.