Securing element for resheathing an intravascular device and associated systems and methods

Patent metadata

Field	Value
Publication number	US-12213690-B2
Application number	US-202218045301-A
Country	US
Kind code	B2
Filing date	Oct 10, 2022
Priority date	Jun 22, 2017
Publication date	Feb 4, 2025
Grant date	Feb 4, 2025

Abstract

Devices and methods for securing a cover of a retrieval device while the retrieval device is resheathed to a more proximal position within a delivery sheath are disclosed herein. A retrieval device may include, for example, a securing element configured to grip the cover when the retrieval device is pulled proximally, to thereby secure the cover. A method of positioning the retrieval device may include, for example: (a) advancing the retrieval device distally through a delivery sheath to a partially deployed state while the securing element is in a first state, and (b) retracting the clot retrieval proximally from the partially deployed state while the securing element is in a second state that grips the cover to secure the cover.

First claim

We claim:

1. A retrieval device deployable through a delivery sheath, the device comprising:
an elongated member;
a mesh coupled to a distal zone of the elongated member, the mesh having a first end portion fixed to the distal zone of the elongated member, a second end portion not fixed to the elongated member, and an intermediate portion extending between the first and second end portions; and
a securing element coupled to the elongated member proximal to the first end portion of the mesh,
wherein, when the mesh is in a delivery state such that at least a portion of the intermediate portion of the mesh and at least a portion of the securing element are positioned within the delivery sheath, moving the elongated member proximally increases an outward force exerted by the securing element against at least a portion of the mesh and an inner surface of the delivery sheath, thereby inhibiting movement of the intermediate portion of the mesh relative to the elongated member.

2. The retrieval device of claim 1 , wherein the mesh extends continuously between the first end portion and the second end portion, and wherein the securing element exerts the outward force against the mesh nearer to the second end portion than the first end portion.

3. The retrieval device of claim 1 , wherein:
the securing element is in a first state when positioned at least partially within the delivery sheath and the retrieval device is moved proximally with respect to the delivery sheath,
the securing element is in a second state when positioned at least partially within the delivery sheath and the retrieval device is moved distally with respect to the delivery sheath, and
the securing element exerts an outward force against the mesh that is less in the second state than in the first state.

4. The retrieval device of claim 1 , wherein:
the securing element is in a first state when positioned at least partially within the delivery sheath and the retrieval device is moved proximally with respect to the delivery sheath,
the securing element is in a second state when positioned at least partially within the delivery sheath and the retrieval device is moved distally with respect to the delivery sheath, and
the securing element has a cross-sectional area that is greater in the first state than in the second state.

5. The retrieval device of claim 1 , wherein the securing element is a braid or stent coupled to the elongated member at a first connector and a second connector, and wherein the first connector is proximal to the second connector along the elongated member.

6. The retrieval device of claim 5 , wherein at least one of the first and second connectors is fixed to the elongated member.

7. The retrieval device of claim 5 , wherein at least one of the first and second connectors is slidably coupled to the elongated member and the other of the first and second connectors is fixed to the elongated member.

8. The retrieval device of claim 5 , wherein the securing element includes a plurality of struts extending from the first connector to the second connector.

9. The retrieval device of claim 1 , wherein the securing element is at least one of a laser cut sphere, a compressible foam or polymer pad, and a braided structure.

10. The retrieval device of claim 1 , wherein the mesh is a braid.

11. The retrieval device of claim 1 , wherein the mesh is a fabric.

12. A system for retrieving vascular material, the system comprising:
a delivery sheath having a distal portion;
a retrieval device including an elongated member, a mesh structure, and a securing element, wherein:
the mesh structure has a fixed portion fixed to a distal zone of the elongated member, and a free end portion,
in a partially deployed state, at least the free end portion of the mesh structure is within the delivery sheath, and the free end portion of the mesh structure is proximal of the fixed portion, and
the securing element is coupled to the elongated member proximal of the fixed portion of the mesh structure, and the securing element is configured to expand when the device is retracted proximally from the partially deployed state such that the securing element grips at least a portion of the mesh structure between the securing element and an inner surface of the delivery sheath, thereby preventing substantial movement of the free end portion of the mesh structure relative to the fixed portion of the mesh structure while the retrieval device is retracted proximally.

13. The system of claim 12 , wherein the securing element exerts the outward force against the mesh structure nearer to the free end portion than the fixed portion.

14. The retrieval device of claim 12 , wherein:
the securing element is in a first state when positioned at least partially within the delivery sheath and the retrieval device is moved proximally with respect to the delivery sheath,
the securing element is in a second state when positioned at least partially within the delivery sheath and the retrieval device is moved distally with respect to the delivery sheath, and
the securing element exerts an outward force against the mesh structure that is less in the second state than in the first state.

15. The retrieval device of claim 12 , wherein:
the securing element is in a first state when positioned at least partially within the delivery sheath and the retrieval device is moved proximally with respect to the delivery sheath,
the securing element is in a second state when positioned at least partially within the delivery sheath and the retrieval device is moved distally with respect to the delivery sheath, and
the securing element has a cross-sectional area that is greater in the first state than in the second state.

16. The retrieval device of claim 12 , wherein the securing element is a braid or stent coupled to the elongated member at a first connector and a second connector, and wherein the first connector is proximal to the second connector along the elongated member.

17. The retrieval device of claim 16 , wherein at least one of the first and second connectors is fixed to the elongated member.

18. The retrieval device of claim 16 , wherein at least one of the first and second connectors is slidably coupled to the elongated member and the other of the first and second connectors is fixed to the elongated member.

19. The retrieval device of claim 12 , wherein the securing element is at least one of a laser cut sphere, a compressible foam or polymer pad, and a braided structure.

20. The retrieval device of claim 12 , wherein the mesh structure is a braid or a fabric.

Assignees

• Covidien Lp

Inventors

• Skillrud Erik
• Deen Daniel
• Epstein Evan

Classifications

• A61B2017/22034

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

• A61B2017/3435

  using everted sleeves · CPC title

• A61B2017/22044

  with a pointed tip · CPC title

• A61B2017/2215

  having an open distal end · CPC title

• A61B2090/3966

  Radiopaque markers visible in an X-ray image · CPC title