Retrieval systems and methods for use thereof

• US 8,795,305 B2
• Filed: 08/05/2013
• Issued: 08/05/2014
• Est. Priority Date: 05/23/2011
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Lazarus Effect, Inc. (Medtronic Plc)
• Inventors: Martin, Brian B., Dieck, Martin S.
• Primary Examiner(s): SHI, KATHERINE MENGLIN
• Application Number:
  US13/959,433
• Publication Number:
  US 20130317589A1
• Time in Patent Office: 365 Days
• Field of Search: 606/108, 606/191, 606/194, 606/198, 606/200, 623/1.11
• US Class Current: 606/159
• CPC Class Codes: A61B 17/22031 Gripping instruments, e.g. forceps, for removing or smashing calculi A61B17/221 takes precedence
• CPC Class Codes: A61B 17/221 Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions surgical snare instruments A61B17/32056
• CPC Class Codes: A61B 17/3207 Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions A61B17/32037 takes precedence; endoscopic cutting instruments A61B17/320016
• CPC Class Codes: A61B 17/320758 with a rotating cutting instrument, e.g. motor driven A61B17/320725, A61B17/32075 and A61B17/320783 take precedence; for removing intra-ocular material A61F9/00763; endoscopic rotatable cutting instruments A61B17/32002
• CPC Class Codes: A61B 2017/22034 for gripping the obstruction or the tissue part from inside
• CPC Class Codes: A61B 2017/3435 using everted sleeves
• CPC Class Codes: A61B 2560/04 Constructional details of apparatus
• CPC Class Codes: A61F 2/01 Filters implantable into blood vessels
• CPC Class Codes: A61F 2/011 Instruments for their placement or removal
• CPC Class Codes: A61F 2/06 Blood vessels
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/962 having an outer sleeve
• CPC Class Codes: A61F 2230/0006 circular
• CPC Class Codes: A61F 2230/0093 Umbrella-shaped, e.g. mushroom-shaped
• CPC Class Codes: A61F 2250/0098 radio-opaque, e.g. radio-opaque markers

Abstract

The devices and methods described herein relate to improved structures for removing obstructions from body lumens. Such devices have applicability in through-out the body, including clearing of blockages within the vasculature, by addressing the frictional resistance on the obstruction prior to attempting to translate and/or mobilize the obstruction within the body lumen.

Claims

1. A medical device for securing a vascular device for removal from a body, the medical device comprising:

a shaft having a flexibility to navigate through tortuous anatomy, the shaft having a distal portion and a proximal portion and a lumen extending therethrough; and

an eversible cover having a fixed section affixed near an end of the distal portion of the shaft, a free section extending in a proximal direction from the fixed section and an eversible cover wall extending from the fixed section to the free section, where on deployment in a vessel the eversible cover wall expands against a vessel wall and is fluid permeable to permit flow therethrough, the eversible cover being axially compliant such that when the vascular device retrieval device is positioned through the shaft lumen and moved in a proximal direction, the friction of the eversible cover against the vessel wall causes the eversible cover to completely evert over the vascular device in a conveyor belt type manner allowing for the free section of the eversible cover to be distal to the vascular device; and

where the eversible cover wall is configured to expand outward upon deployment in the vessel and to collapse inward after everting and compress an obstruction.

2. The medical device of claim 1, the fixed section of the eversible cover is affixed at the end of the distal portion of the shaft.

3. The medical device of claim 1, where at least a portion of the eversible cover wall adjacent to the distal end has a set shape that is everted upon expansion.

4. The medical device of claim 1, where the eversible cover comprises a plurality of layers forming the eversible cover wall.

5. The medical device of claim 1, where a portion of the eversible cover wall extends distally beyond the fixed section when the eversible cover is expanded.

6. The medical device of claim 1, where the fixed section of the eversible cover comprises a pre-set shape to reduce a force required to evert the eversible cover.

7. The medical device of claim 1, where the lumen of the shaft is sized to permit advancement of the shaft over a wire of the vascular device.

8. The medical device of claim 7, where the vascular device comprises an elongated stent structure.

9. The medical device of claim 7, where the vascular device comprises a device selected from a group consisting of a filter, an artherectomy device, a rotational cutter, an aspiration device, stent based retrievers, balloon and retrieval baskets.

10. The medical device of claim 1, where the eversible cover is self expanding.

11. The medical device of claim 1, where a portion of the eversible cover at or adjacent to the free section of the eversible cover comprises a bulbous shape.

12. The medical device of claim 1, where the eversible cover comprises a mesh material.

13. The medical device of claim 12, where the mesh material comprises a single continuous wire.

14. The medical device of claim 1, where the eversible cover comprises an inner braided layer and an outer braided layer, where the outer braided layer is relatively more compliant than the inner braided layer.

15. The medical device of claim 1, where the eversible cover is configured to taper or collapse towards the free end after everting.

16. A medical device for securing a vascular device for removal from a body, the medical device comprising:

a shaft having a distal portion and a proximal portion and a lumen extending therethrough; and

an eversible cover having a fixed section affixed near an end of the distal portion of the shaft, a free section extending in a proximal direction from the fixed section and an eversible cover wall extending from the fixed section to the free section, where on deployment in a vessel the eversible cover wall expands against a vessel wall, the eversible cover being axially compliant such that when the vascular device is positioned through the shaft lumen distally to the eversible cover and moved in a proximal direction, the friction of the eversible cover against the vessel wall and the axial compliance of the eversible cover allows the eversible cover to secure the vascular device by movement of the fixed section of the eversible cover proximally, allowing the eversible cover to completely evert over the vascular device such that the free section of the eversible cover moves distal to the vascular device; and

where the eversible cover wall is configured to expand outward upon deployment in the vessel and to collapse inward after everting and compress the obstruction.

17. The medical device of claim 16, the fixed section of the eversible cover is affixed at the end of the distal portion of the shaft.

18. The medical device of claim 16, where at least a portion of the eversible cover wall adjacent to the distal end has a set shape that is everted upon expansion.

19. The medical device of claim 16, where the eversible cover comprises a plurality of layers forming the eversible cover wall.

20. The medical device of claim 16, where a portion of the eversible cover wall extends distally beyond the fixed section when the eversible cover is expanded.

21. The medical device of claim 16, where the fixed section of the eversible cover comprises a pre-set shape to reduce a force required to evert the eversible cover.

22. The medical device of claim 16, where the lumen of the shaft is sized to permit advancement of the shaft over a wire of the vascular device.

23. The medical device of claim 22, where the vascular device comprises an elongated stent structure.

24. The medical device of claim 22, where the vascular device comprises a device selected from a group consisting of a filter, an artherectomy device, a rotational cutter, an aspiration device, stent based retrievers, balloon and retrieval baskets.

25. The medical device of claim 16, where a portion of the eversible cover at or adjacent to the free section of the eversible cover comprises a bulbous shape.

26. The medical device of claim 16, where the eversible cover comprises a mesh material.

27. The medical device of claim 26, where the mesh material comprises a single continuous wire.

28. The medical device of claim 16, where the eversible cover comprises an inner braided layer and an outer braided layer, where the outer braided layer is relatively more compliant than the inner braided layer.

29. The medical device of claim 16, where the eversible cover is configured to taper or collapse towards the free end after everting.

30. A medical device for securing a vascular device for removal from a body, the medical device comprising:

a shaft having a flexibility to navigate through tortuous anatomy, the shaft having a distal portion and a proximal portion and a lumen extending therethrough; and

an eversible cover having a fixed section affixed near an end of the distal portion of the shaft, a free section extending in a proximal direction from the fixed section and an eversible cover wall extending from the fixed section to the free section, where on deployment in a vessel the eversible cover wall expands against a vessel wall and is fluid permeable to permit flow therethrough, the eversible cover being axially compliant such that the friction of the eversible cover against the vessel wall and the axial compliance of the eversible cover allows the eversible cover to secure the vascular device by movement of the fixed section of the eversible cover proximally causing the eversible cover to evert over the vascular device to move the free section of the eversible cover distal to the vascular device; and

where the eversible cover wall is configured to expand outward upon deployment in the vessel and to collapse inward after everting and compress the obstruction.