Multi-pivot thrombectomy device

Patent metadata

Field	Value
Publication number	US-9314248-B2
Application number	US-201213669652-A
Country	US
Kind code	B2
Filing date	Nov 6, 2012
Priority date	Nov 6, 2012
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

A device may be used for capturing and retrieving vascular debris. The device may comprise: at least two segments radially expandable from a collapsed state to an expanded state, each of the at least two segments having (a) a waist comprising a radially largest region of the segment and (b) two longitudinal ends; at least one intermediate portion, each of the at least one intermediate portion comprising a pivot that connects adjacent segments, each pivot having a diameter less than a diameter of the waist; a tether attached to a proximalmost of the at least two segments and configured to position the at least two segments; wherein each of the at least two segments comprises at least two struts that extend longitudinally from a proximal end to a distal end of the segment, the at least two struts tapering from the waist radially inward toward a longitudinal axis of the device as the at least two struts approach an adjacent intermediate portion.

First claim

What is claimed is:

1. A device for retrieving vascular debris in a vasculature comprising:
at least three segments radially expandable from a collapsed state to an expanded state, each of the at least three segments having a waist comprising a radially largest region of the segment;
at least one intermediate portion, each of the at least one intermediate portion comprising a pivot that connects adjacent segments, each pivot having a diameter less than a diameter of the waist;
a tether attached to a proximalmost of the at least three segments and configured to position the at least three segments;
wherein each of the at least three segments comprises a proximal end and a distal end that are connected by only struts and sub-struts, the struts and sub-struts extending radially outside the diameter of the pivot, wherein, in each of the at least three segments, at least one strut extends proximally from the distal end and along a first longitudinal region of the segment and divides into at least two sub-struts, the at least two sub-struts being entirely within a second longitudinal region of the segment that is outside the radially largest region of the segment, the struts tapering from the waist radially inwardly toward a longitudinal axis of the device as the struts approach an adjacent intermediate portion;
wherein the at least three segments and the at least one intermediate portion form a single monolithic structure;
wherein a longitudinal length of each intermediate portion is less than a longitudinal length of each of the segments;
wherein each intermediate portion forms a circumferentially continuous hollow cylinder.

2. The device of claim 1 , wherein each of the at least three segments have substantially similar waist dimensions in the expanded state.

3. The device of claim 1 , wherein each of the at least three segments have substantially similar waist dimensions in the collapsed state.

4. The device of claim 1 , wherein each of the at least three segments have the same number of struts.

5. The device of claim 1 , wherein a total number of the sub-struts is double a total number of struts that are connected to proximal sides of the sub-struts and double a total number of the struts that are connected to distal sides of the sub-struts.

6. The device of claim 1 , wherein the diameter of the waist in the expanded state is at least five times larger than the diameter of the pivot.

7. The device of claim 1 , wherein at least one strut is configured to flex along its length, allowing the at least three segments to pivot multiaxially about their respective intermediate portion.

8. A system for retrieving vascular debris in a vasculature comprising:
at least three segments expandable from a collapsed state to an expanded state, each of the at least three segments having a waist comprising a radially largest region of the segment;
at least two intermediate portions, each of the at least two intermediate portions comprising a pivot that connects adjacent segments, each pivot having a diameter less than a diameter of the waist;
a sheath configured to encase the at least three segments in the collapsed state; and
a tether attached to a proximalmost of the at least three segments and configured to position the at least three segments relative to the sheath;
wherein each of the at least three segments comprises, between a proximal end and a distal end thereof, only struts and sub-struts, the struts and sub-struts extending radially outside the diameter of the pivot, wherein, in each of the at least three segments, at least one strut extends proximally from the distal end and along a first longitudinal region of the segment and divides into at least two sub-struts, the at least two sub-struts being entirely within a second longitudinal region of the segment that is outside the radially largest region of the segment;
wherein the at least three segments and the at least two intermediate portions form a single monolithic structure;
wherein a longitudinal length of each intermediate portion is less than a longitudinal length of each of the segments;
wherein each intermediate portion forms a circumferentially continuous hollow cylinder.

9. The system of claim 8 , wherein each of the at least three segments have substantially similar waist dimensions in the expanded state.

10. The system of claim 8 , wherein each of the at least three segments have substantially similar waist dimensions in the collapsed state.

11. The system of claim 8 , wherein each of the at least three segments comprises at least two struts that extend from a proximal end to a distal end of the segment.

12. The system of claim 11 , wherein each of the at least two struts tapers from the waist toward a longitudinal axis as it approaches an adjacent intermediate portion.

13. The system of claim 11 , wherein a total number of the sub-struts is double a total number of struts that are connected to proximal sides of the sub-struts and double a total number of the struts that are connected to distal sides of the sub-struts.

14. The system of claim 8 , wherein the at least three segments comprises at least four segments.

15. A method of retrieving vascular debris from a vasculature comprising:
inserting into the vasculature of a patient at least a portion of a sheath comprising a distal opening and encasing at least two segments expandable from a collapsed state to an expanded state, each of the at least two segments having a waist comprising a radially largest region of the segment and at least one intermediate portion comprising a pivot connecting the segment to an axially adjacent segment, wherein the at least two segments and the at least one intermediate portion form a single monolithic structure, wherein each of the at least two segments comprises, between a proximal end and a distal end thereof, only struts and sub-struts, the struts and sub-struts extending radially outside a diameter of the at least one intermediate portion, wherein, in each of the at least two segments, at least one strut extends proximally from the distal end and along a first longitudinal region of the segment and divides into at least two sub-struts, the at least two sub-struts being entirely within a second longitudinal region of the segment that is outside the radially largest region of the segment, wherein a longitudinal length of each intermediate portion is less than a longitudinal length of each of the segments, wherein each intermediate portion forms a circumferentially continuous hollow cylinder;
expanding at least a portion of the at least two segments into vascular debris; and
retrieving the at least two segments and the vascular debris to within the sheath.

16. The method of claim 15 , wherein the vascular debris is engaged with a proximalmost segment of the at least two segments.

17. The method of claim 15 , further comprising: capturing, within a distal segment, vascular debris dislodged from a proximal segment.

18. The method of claim 15 , wherein the at least a portion of the at least two segments becomes engaged throughout the vascular debris.

19. The method of claim 15 , wherein each of the at least two segments expands to substantially similar outer diameters.

20. The method of claim 15 , wherein each of the at least two segments comprises at least two struts that extend from a proximal end to a distal end of the segment.

21. The method of claim 20 , wherein expanding at least a portion of the at least two segments is performed by retracting

Assignees

• Covidien Lp

Inventors

• Molaei Masoud

Classifications

• A61B17/221 Primary

  Gripping devices in the form of loops or baskets {for gripping calculi or similar types of obstructions (surgical snare instruments A61B17/32056)} · CPC title

• A61B2017/2212

  having a closed distal end, e.g. a loop · CPC title

• A61F2/01

  Filters implantable into blood vessels · CPC title

• A61B2017/22034

  for gripping the obstruction or the tissue part from inside · CPC title

• A61B17/12109 Primary

  in a blood vessel · CPC title