RETRIEVAL SYSTEMS AND METHODS FOR USE THEREOF

• US 20130325051A1
• Filed: 08/05/2013
• Published: 12/05/2013
• 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.
• Granted Patent: US 8,932,319 B2
• Time in Patent Office: Days
• US Class Current: 606/194
• 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 retrieval system for securing an obstruction within a vessel lumen and for use with a catheter configured to be navigated through the vasculature, the device comprising:

an elongated stent comprising a plurality of struts, the stent being collapsible for positioning in the catheter during delivery and having an expanded profile such that when expanded the struts are configured to engage the obstruction;

a shaft fixedly attached to the elongated stent and having a flexibility to navigate through tortuous anatomy;

a fluid permeable cover having a distal end coupled to a proximal end of the elongated stent a cover wall defining a cavity and extending along the shaft, and a proximal end being moveable relative to the shaft, where the fluid permeable cover is collapsible for positioning in the catheter during delivery and is expandable upon deployment from the catheter such that a portion of the fluid permeable cover is expandable; and

where the fluid permeable cover is axially pliable such that when the device is deployed in the vessel and frictional forces are applied against the fluid permeable cover, proximal movement of the shaft and elongated stent cause inversion of the fluid permeable cover wall such that the fluid permeable cover wall everts over the elongated stent.

2. The medical device of claim 1, where the fluid permeable cover, elongated stent, and shaft are a unitary structure.

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

4. The medical device of claim 1, further comprising a catheter body, where in a delivery configuration, the shaft, capturing structure and eversible cover are located within the catheter body and where the capturing structure is advanceable in and out of a distal end of the catheter body.

5. The medical device of claim 1, where the fluid permeable cover comprises a plurality of layers forming the cover wall.

6. The medical device of claim 1, where the free section of the fluid permeable cover partially restricts about the shaft without being attached to the shaft.

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

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

9. The medical device of claim 1, where the fluid permeable cover is self expanding.

10. The medical device of claim 1, where a portion of the cover at or adjacent to the distal opening comprises a bulbous shape.

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

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

13. The medical device of claim 1, where the fluid permeable 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.

14. A medical device retrieval system for securing an obstruction within a vessel lumen and for use with a catheter configured to be navigated through the vasculature, the device comprising:

a capturing structure configured to engage the obstruction for removal from the vessel lumen;

a shaft fixedly attached to the capturing structure and having a flexibility to navigate through tortuous anatomy;

a fluid permeable cover having a distal end coupled adjacent to a proximal end of the capturing structure, a cover wall defining a cavity and extending along the shaft, and a proximal end being moveable relative to the shaft, where the fluid permeable cover is collapsible for positioning in the catheter during delivery and is expandable upon deployment from the catheter such that a portion of the fluid permeable cover is expandable; and

where the fluid permeable cover is axially pliable such that when the device is deployed in the vessel and frictional forces are applied against the fluid permeable cover, proximal movement of the shaft and capturing structure cause inversion of the fluid permeable cover wall such that the fluid permeable cover wall everts over the capturing structure.

15. The medical device of claim 14, where the capturing structure comprises an elongated stent structure having a plurality of struts, the stent being collapsible for positioning in the catheter during delivery and having an expanded profile such that when expanded the struts.

16. The medical device of claim 14, where the distal end of the fluid permeable cover is coupled directly to the capturing structure.

17. The medical device of claim 14, where the distal end of the fluid permeable cover overlaps a portion of the capturing structure.

18. The medical device of claim 14, where the distal end of the fluid permeable cover is coupled directly to the shaft leaving a gap between the proximal end of the fluid permeable cover and the distal end of the capturing structure.

19. The medical device of claim 14, where the capturing structure comprises a device selected from a group consisting of a filter, an artherectomy device, a rotational cutter, an aspiration device, stent based retrievers, a balloon and retrieval baskets.

20. A method of securing an obstruction within a vessel, the method comprising:

positioning a catheter within a vessel;

advancing a shaft having an obstruction removal device affixed thereto out of the catheter;

advancing an eversible cover out of the catheter such that a fixed end of the eversible cover is adjacent to a proximal end of the obstruction removal device and a free end of the eversible cover is moveable relative to the shaft and obstruction removal device;

expanding at least a portion of the eversible cover against a portion of a wall of the vessel;

allowing the obstruction removal device to become at least partially enmeshed with the obstruction; and

proximally translating the shaft and obstruction removal device with at least a portion of the obstruction affixed thereto such that resistance of the eversible cover against the vessel resists movement of the eversible cover causing the free section of the eversible cover to evert over the proximally translated obstruction removal device.

21. The method of claim 20, further comprising further withdrawing the shaft from the vessel such that during withdrawal the eversible cover forms a protective barrier over the obstruction to lessen shearing forces caused by the vessel and reduce dislodging portions of the obstruction from the obstruction removal device.