IP Library › Granted Patent US 12,256,938
Granted Patent B2
US 12,256,938 · App. 18/486,974 · Granted Mar 25, 2025

Devices and methods for excluding the left atrial appendage

Inventors: David A. Melanson (Hudson, NH); Andy H. Levine (Newton Highlands, MA); James H. Loper (Wales, MA); Michael T. Radford (Nashua, NH); Carol Devellian (Topsfield, MA); Aaron V. Kaplan (Norwich, VT); Ronald B. Lamport (Pelham, NH)
Assignee: Conformal Medical, Inc.
A61B17/12122A61B17/12031A61B17/12131A61B17/12145A61B17/1215A61B17/12172A61B17/12177A61B17/12181A61M29/00A61B2017/00004A61B2017/00022A61B2017/00221A61B17/00491A61B2017/00526A61B2017/00853A61B2017/00893A61B2017/00898A61B2017/00951A61B17/12036A61B2017/1205A61B2017/12054A61B17/12136A61B17/1219A61B2017/320069A61B2018/0016A61B2018/0022A61B2018/00577A61B18/1492A61B2090/064A61B2090/3966A61M2205/04A61M2205/3331A61N1/395A61N1/39622A61N7/022
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Quick Facts
Patent No.
US 12,256,938
App. No.
18/486,974
Granted
Mar 25, 2025
Kind
B2
Abstract

Devices and methods are described for occluding the left atrial appendage (LAA). The device excludes the LAA from blood flow to prevent blood from clotting within the LAA and subsequently embolizing, particularly in patients with atrial fibrillation. The implantable device is delivered via transcatheter delivery into the LAA and secured within the LAA. The implant comprises an expandable and compliant frame and an expandable and conformable tubular foam body carried by the frame. The device may have a thromboresistant cover at a proximal end and a thromboresistant coating on the foam body. The frame may have recapture struts inclining radially outwardly in the distal direction from a central hub. The frame may have axially extending side wall struts, with adjacent pairs of side wall struts joined at one or more apexes. Anchors extend from the frame to engage tissue. The anchors can also be reversible to allow retraction of the anchors and repositioning or retrieval of the device.

Claims (25)

1. A left atrial appendage occlusion system, comprising:

a left atrial appendage occlusion device comprising:

a foam body having a closed proximal end, and

an expandable frame;

a delivery catheter configured to carry the left atrial appendage occlusion device for delivery to the left atrial appendage; and

a tether extending through the delivery catheter and through the proximal end of the foam body and engaged with a pin of the expandable frame, the pin having a longitudinal axis with first and second opposed pin sides transverse to the pin longitudinal axis, wherein the tether is configured to extend distally from the delivery catheter on the first pin side, wrap around the pin, and extend back proximally into the delivery catheter on the second pin side.

2. The left atrial appendage occlusion system of claim 1 , wherein the pin is located within a proximal hub of the expandable frame on a distal side of the proximal end of the foam body.

3. The left atrial appendage occlusion system of claim 1 , wherein a distal end of the foam body comprises one or more radiopaque markers.

4. The left atrial appendage occlusion system of claim 1 , wherein the tether comprises an ultra-high molecular weight polyethylene.

5. The left atrial appendage occlusion system of claim 1 , wherein the pin extends laterally across a central lumen of the expandable frame.

6. The left atrial appendage occlusion system of claim 1 , wherein the tether is configured to engage the expandable frame distal to the closed proximal end.

7. The left atrial appendage occlusion system of claim 6 , wherein the tether is further configured to penetrate the closed proximal end.

8. The left atrial appendage occlusion system of claim 1 , wherein the tether is further configured to be cut thereby disengaging the tether from a pin of the expandable frame.

9. The left atrial appendage occlusion system of claim 1 , wherein the delivery catheter further comprises a sheath, the sheath configured to be retracted to deliver the left atrial appendage occlusion device.

10. The left atrial appendage occlusion system of claim 9 , wherein the tether is further configured to be pulled proximally to re-sheath the left atrial appendage occlusion device.

11. The left atrial appendage occlusion system of claim 1 , wherein the left atrial appendage device is configured to be implanted such that a central longitudinal axis of the device is oriented non-parallel to a primary longitudinal axis of the left atrial appendage when the left atrial appendage device is deployed in the left atrial appendage.

12. The left atrial appendage occlusion system of claim 11 , wherein the central longitudinal axis of the left atrial appendage occlusion device is configured to form an angle with the primary longitudinal axis of the left atrial appendage of at least about 15 degrees.

13. The left atrial appendage occlusion system of claim 1 , wherein the left atrial appendage occlusion device in an unconstrained state has an axial length (L) and an outer diameter (D), and wherein a ratio L/D is less than 1.

14. The left atrial appendage occlusion system of claim 1 , wherein the left atrial appendage occlusion device further comprises a thromboresistant coating or layer on a proximal end of the foam body.

15. The left atrial appendage occlusion system of claim 14 , wherein the thromboresistant coating or layer comprises Polytetrafluoroethylene (ePTFE).

16. The left atrial appendage occlusion system of claim 14 , wherein the thromboresistant coating or layer is substantially occlusive to blood flow.

17. The left atrial appendage occlusion system of claim 1 , wherein the expandable frame further comprises:

plurality of reentry struts configured to extend radially outwardly from a central hub and a tubular body configured to extend distally from radially-outer ends of the reentry struts, and

a plurality of anchors extending radially outwardly from the tubular body and penetrating the foam body.

18. The left atrial appendage occlusion system of claim 1 , wherein the foam body of the left atrial appendage occlusion device comprises a foam side wall that extends distally beyond a distal end of the frame to form a distal, atraumatic bumper.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 18, 2025
From: MELANSON, DAVID A.; LEVINE, ANDY H.; LOPER, JAMES H.; RADFORD, MICHAEL T.; DEVELLIAN, CAROL; KAPLAN, AARON V.
To: CONFORMAL MEDICAL, INC.
Reel/Frame 070247/0430 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 18, 2025
From: LAMPORT, RONALD B.
To: CONFORMAL MEDICAL, INC.
Reel/Frame 070252/0411 →
Continuity (5)
Division 17338520 · Jun 3, 2021
Continuation 15795083 · Oct 26, 2017
Provisional Application 62459503 · Feb 15, 2017
Provisional Application 62413632 · Oct 27, 2016
Related Publication 20240148385A1 · May 9, 2024
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