Multi-component obstruction removal system and method

• US 9,833,252 B2
• Filed: 03/12/2014
• Issued: 12/05/2017
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Microvention Incorporated (Terumo Corporation)
• Original Assignee: Microvention Incorporated (Terumo Corporation)
• Inventors: Sepetka, Ivan, Bowman, Heath
• Primary Examiner(s): Eastwood, David C
• Application Number:
  US14/207,331
• Publication Number:
  US 20140277013A1
• Time in Patent Office: 1,364 Days
• 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 17/320725 with radially expandable cutting or abrading elements A61B17/32075 takes precedence
• CPC Class Codes: A61B 17/32075 Pullback cutting; combined forward and pullback cutting, e.g. with cutters at both sides of the plaque
• 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 18/1492 having a flexible, catheter-like structure, e.g. for heart ablation A61B18/1477 takes precedence
• CPC Class Codes: A61B 2017/22034 for gripping the obstruction or the tissue part from inside
• CPC Class Codes: A61B 2017/2212 having a closed distal end, e.g. a loop
• CPC Class Codes: A61B 2017/2215 having an open distal end
• CPC Class Codes: A61B 2017/320716 comprising means for preventing embolism by dislodged material
• CPC Class Codes: A61B 2017/320741 for stripping the intima or the internal plaque from a blood vessel, e.g. for endarterectomy
• CPC Class Codes: A61B 2018/0041 Removal of thrombosis
• CPC Class Codes: A61B 2018/00422 Angioplasty
• CPC Class Codes: A61B 2018/1435 Spiral

Abstract

An obstruction removal device is described having a retrieval component used to engage an obstruction within the vasculature and a sheath component that is capable of inverting to fold over the obstruction and the retrieval component. The sheath component helps contain the obstruction and minimizes trauma to the blood vessel during the removal process.

Claims

1. An obstruction removal device comprising:

a delivery device;

a retriever slidably disposed within said delivery device and extendable out of a distal end thereof, said retriever including a plurality of engaging members arranged end-to-end and connected together such that said engaging members are able to rotate independently of each other;

a pusher connected to said retriever and usable to slide said retriever through said delivery device;

a self-expanding sheath positioned on an outside surface of said delivery device such that, after said retriever has captured an obstruction, said sheath is invertible over said retriever and said obstruction; and

,

wherein said delivery device includes a restraining element that sits over a proximal end of said sheath, preventing said sheath from inversion until said restraining element is retracted and said sheath is released.

2. The obstruction device of claim 1 wherein said sheath has a distal end connected to said delivery device.

3. A method of removing an obstruction from a body lumen comprising:

navigating an obstruction retriever, and a sheath on an outside of a delivery device containing said obstruction retriever, through and distal of an obstruction, said sheath having a proximal end held to said delivery device with a restraining element, and said obstruction retriever including a plurality of engaging members arranged end-to-end and connected together such that said engaging members are able to rotate independently of each other;

capturing said obstruction with said retriever by releasing said sheath from said restraining element and retracting said delivery device back through said obstruction, thereby causing said sheath to invert;

and,

removing said obstruction trapped between said sheath and said obstruction retriever from said body lumen.

4. The method of claim 3 wherein navigating the obstruction retriever comprises navigating the delivery device containing said obstruction retriever in a collapsed configuration to said obstruction.

5. The method of claim 4 wherein capturing said obstruction with said retriever comprises retracting said delivery device relative to said retriever thereby allowing said retriever to expand.

6. The method of claim 5 wherein allowing said retriever to expand comprises allowing said retriever to expand distal of said obstruction.

7. The method of claim 4 wherein capturing said obstruction with said retriever comprises retracting said delivery device relative to said retriever thereby allowing said retriever to expand distal of said obstruction and pulling said retriever through said obstruction.

8. The method of claim 3 wherein the distal end of the sheath is attached to the delivery device.

9. An obstruction removal device comprising:

a first component having a plurality of expandable engaging members arranged end-to-end and able to rotate independently of each other and advanceable through a catheter; and

,

a flexible second component;

a pusher; and

,

a restraining element releasably restraining said flexible second component to said catheter;

wherein said second component is self-expanding and associated with said first component such that said second component can be distally inverted over said first component.

10. The obstruction removal device of claim 9 further comprising:

a delivery device slidably containing at least said first component.

11. The obstruction removal device of claim 9 wherein said second component has a distal end fixed to a distal end of said catheter.

12. The obstruction removal device of claim 9 wherein said second component comprises a mesh.