Delivery system with helical shaft

• US 20060155357A1
• Filed: 01/12/2005
• Published: 07/13/2006
• Est. Priority Date: 01/12/2005
• Status: Active Grant

• Current Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Original Assignee: Cook Incorporated (Cook Group Incorporated)
• Inventors: Melsheimer, Jeffry S.
• Granted Patent: US 7,578,838 B2
• Time in Patent Office: Days
• US Class Current: 623/1.110
• 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 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 2002/91575 connected peak to trough
• CPC Class Codes: A61F 2002/9665 with additional retaining means
• CPC Class Codes: A61F 2230/0054 V-shaped

Abstract

A delivery system is provided for releasing a medical device within a body cavity. The delivery system may be used in an intravascular procedure to implant a self-expandable stent. A helical structure on the shaft of the delivery system engages the inner surface of the stent. As a result, the stent may be released by rotating the shaft relative to the stent which pushes the stent forward from the distal end of the shaft.

Claims

1. A delivery system for a medical device, comprising:

a shaft comprising an outer circumference with a helical raised region and an interposed helical recessed region, said helical raised and recessed regions disposed along a distal portion of said shaft;

a sheath comprising an inner circumference with a longitudinal raised region and an interposed longitudinal recessed region, said longitudinal raised and recessed regions disposed along a distal portion of said sheath;

wherein said outer circumference of said shaft is adapted to be disposed within said inner circumference of said sheath, said helical raised region of said shaft having a smaller outer diameter than an inner diameter of said raised longitudinal region of said sheath, said shaft thereby being longitudinally moveable within said sheath without rotating either of said shaft or said sheath; and

wherein a medical device is receivable between said shaft and said sheath, said helical raised and recessed regions of said shaft engaging an inner surface of said medical device and said longitudinal raised and recessed regions of said sleeve engaging an outer surface of said medical device, said medical device thereby being longitudinally moveable relative to said shaft upon relative rotational movement between said shaft and said sheath.

2. The delivery system according to claim 1, further comprising a first handle connected to said sheath and a second handle connected to a rod extending through said first handle, said rod being connected to said shaft.

3. The delivery system according to claim 1, further comprising a first raised portion on said inner surface of said medical device and a second raised portion on said outer surface of said medical device, said first raised portion being engaged by said helical raised and recessed regions of said shaft, and said second raised portion being engaged by said longitudinal raised and recessed regions of said sleeve.

4. The delivery system according to claim 3, wherein said medical device comprises radiopaque markers, said first raised portion and said second raised portion being formed by said radiopaque markers.

5. The delivery system according to claim 1, wherein said medical device is a self-expandable stent, said sheath compressing said stent into a collapsed diameter for intravascular delivery.

6. The delivery system according to claim 5, further comprising first raised portions on said inner surface of said stent and second raised portions on said outer surface of said stent, said first raised portions being engaged by said helical raised and recessed regions of said shaft, and said second raised portions being engaged by said longitudinal raised and recessed regions of said sleeve, said stent comprising at least one of said first raised portions and said second raised portions at each end of said stent.

7. The delivery system according to claim 6, wherein said stent comprises radiopaque markers, said first raised portions and said second raised portions being formed by said radiopaque markers.

8. The delivery system according to claim 6, wherein said stent further comprises at least one of said first raised portions and said second raised portions at an intermediate position between said ends of said stent.

9. The delivery system according to claim 8, wherein said stent comprises radiopaque markers, said first raised portions and said second raised portions being formed by said radiopaque markers.

10. The delivery system according to claim 1, wherein said helical raised and recessed regions of said shaft and said longitudinal raised and recessed regions of said sleeve extend a length of at least two of said medical devices, at least two of said medical devices thereby being receivable between said shaft and said sleeve one after the other.

11. The delivery system according to claim 10, wherein said at least two medical devices are self-expandable stents, said sheath compressing said stents into collapsed diameters for intravascular delivery.

12. The delivery system according to claim 1, wherein said helical recessed region of said shaft comprises at least one groove.

13. The delivery system according to claim 1, wherein said shaft further comprises a lumen extending through said shaft adapted to receive a guidewire.

14. The delivery system according to claim 1, wherein said medical device is a self-expandable stent, said sheath compressing said stent into a collapsed diameter for intravascular delivery;

further comprising a first handle connected to said sheath and a second handle connected to a rod extending through said first handle, said rod being connected to said shaft; and

said shaft further comprising a lumen extending through said shaft adapted to receive a guidewire.

15. The delivery system according to claim 14, further comprising first raised portions on said inner surface of said stent and second raised portions on said outer surface of said stent, said first raised portions being engaged by said helical raised and recessed regions of said shaft, and said second raised portions being engaged by said longitudinal raised and recessed regions of said sleeve, said stent comprising at least one of said first raised portions and said second raised portions at each end of said stent and at an intermediate position between said ends of said stent;

wherein said stent comprises radiopaque markers, said first raised portions and said second raised portions being formed by said radiopaque markers;

said helical raised and recessed regions of said shaft and said longitudinal raised and recessed regions of said sleeve extend a length of at least two of said medical devices, at least two of said medical devices thereby being receivable between said shaft and said sleeve one after the other; and

said helical recessed region of said shaft comprises at least one groove.

16. A delivery system for a medical device, comprising:

a shaft comprising an outer circumference with a helical raised region and an interposed helical recessed region, said helical raised and recessed regions disposed along a distal portion of said shaft;

a sheath comprising an inner circumference disposed along a distal portion of said sheath; and

wherein said outer circumference of said shaft is adapted to be disposed within said inner circumference of said sheath, a medical device thereby being receivable between said shaft and said sheath, said helical raised and recessed regions of said shaft engaging an inner surface of said medical device, and said medical device being longitudinally moveable relative to said sleeve upon relative movement between said shaft and said sheath.

17. The delivery system according to claim 16, further comprising a first handle connected to said sheath and a second handle connected to a rod extending through said first handle, said rod being connected to said shaft.

18. The delivery system according to claim 16, further comprising a first raised portion on an inner surface of said medical device and a second raised portion on an outer surface of said medical device, said first raised portion being engaged by said helical raised and recessed regions of said shaft, and said second raised portion being engaged by longitudinal raised and recessed regions disposed along said inner circumference of said sleeve.

19. The delivery system according to claim 18, wherein said medical device comprises radiopaque markers, said first raised portion and said second raised portion being formed by said radiopaque markers.

20. The delivery system according to claim 16, wherein said medical device is a self-expandable stent, said sheath compressing said stent into a collapsed diameter for intravascular delivery.

21. The delivery system according to claim 20, further comprising first raised portions on said inner surface of said stent and second raised portions on an outer surface of said stent, said first raised portions being engaged by said helical raised and recessed regions of said shaft, and said second raised portions being engaged by longitudinal raised and recessed regions disposed along said inner circumference of said sleeve, said stent comprising at least one of said first raised portions and said second raised portions at each end of said stent.

22. The delivery system according to claim 21, wherein said stent comprises radiopaque markers, said first raised portions and said second raised portions being formed by said radiopaque markers.

23. The delivery system according to claim 21, wherein said stent further comprises at least one of said first raised portions and said second raised portions at an intermediate position between said ends of said stent.

24. The delivery system according to claim 23, wherein said stent comprises radiopaque markers, said first raised portions and said second raised portions being formed by said radiopaque markers.

25. The delivery system according to claim 16, wherein said helical raised and recessed regions of said shaft extend a length of at least two of said medical devices, at least two of said medical devices thereby being receivable between said shaft and said sleeve one after the other.

26. The delivery system according to claim 25, wherein said at least two medical devices are self-expandable stents, said sheath compressing said stents into collapsed diameters for intravascular delivery.

27. The delivery system according to claim 16, wherein said helical recessed region of said shaft comprises at least one groove.

28. The delivery system according to claim 16, wherein said shaft further comprises a lumen extending through said shaft adapted to receive a guidewire.

29. The delivery system according to claim 16, wherein said medical device is a self-expandable stent, said sheath compressing said stent into a collapsed diameter for intravascular delivery;

further comprising a first handle connected to said sheath and a second handle connected to a rod extending through said first handle, said rod being connected to said shaft; and

said shaft further comprising a lumen extending through said shaft adapted to receive a guidewire.

30. The delivery system according to claim 29, further comprising first raised portions on said inner surface of said stent and second raised portions on an outer surface of said stent, said first raised portions being engaged by said helical raised and recessed regions of said shaft, and said second raised portions being engaged by longitudinal raised and recessed regions disposed along said inner circumference of said sleeve, said stent comprising at least one of said first raised portions and said second raised portions at each end of said stent and at an intermediate position between said ends of said stent;

wherein said stent comprises radiopaque markers, said first raised portions and said second raised portions being formed by said radiopaque markers;

said helical raised and recessed regions of said shaft and said longitudinal raised and recessed regions of said sleeve extend a length of at least two of said medical devices, at least two of said medical devices thereby being receivable between said shaft and said sleeve one after the other; and

said helical recessed region of said shaft comprises at least one groove.