LAAC Implant Locking Sequence for Atraumatic Ostial Closure

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Solution Overview

Problem

Existing medical devices for left atrial appendage closure face challenges in minimizing the risk of pericardial effusion and LAA rupture during the deployment of the implant, particularly when reshaping and reshaping the LAA and reshaping the LAA, which increases the likelihood of rupture and strain on the LAA, and reshaping the LAA, and reshaping the LAA, and reshaping the LAA, and reshaping the LAA, and reshaping the LAA, which increases the likelihood of LAA puncture, pericardial effusion, and remnant LAA.

Innovation Solution

An occlusive implant with an expandable framework and a lock mechanism that allows for proximal deployment and fixation at the ostial plane, minimizing distal force application, reducing strain on the LAA, and optimizing implant positioning to prevent remnant LAA by twisting the neck of the LAA around the shaft and securing it with a lock at the ostial plane.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the LAA is reshaped and repositioned during implant deployment, then complete LAA obliteration is achieved, but the risk of LAA rupture and pericardial effusion increases

Engineering Contradiction:

Improvecomplete LAA obliterationVSAvoidLAA rupture and pericardial effusion risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The implant is deployed in reverse sequence compared to conventional devices. Instead of expanding the framework first and then applying fixation force, the lock is deployed first to engage the LAA ostium, followed by gradual framework expansion. This inverts the force application timeline, allowing the LAA to be gradually accommodated rather than suddenly reshaped, reducing rupture risk while achieving complete obliteration.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The lock mechanism is deployed and engaged with the LAA ostium before the expandable framework is fully expanded. This preliminary action secures the implant position and begins the gentle reshaping process early, allowing controlled adaptation of the LAA tissue to the implant structure, thereby minimizing sudden strain and reducing the risk of pericardial effusion.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the expandable framework is deployed distally first, then fixation is achieved, but systemic tension and strain on the LAA increase

Engineering Contradiction:

Improveimplant fixationVSAvoidsystemic tension and strain

Core Design Contradiction:

ReliabilityVSForce

Solution Approach 1:

The deployment sequence is inverted: the lock (distal fixation element) is deployed first to engage the LAA ostium, followed by proximal-to-distal expansion of the framework. This reverses the conventional distal-to-proximal deployment, allowing fixation to be established before full expansion, thereby distributing force more evenly and reducing peak systemic tension during the procedure.

Inventive Principle:

Principle #13The other way round (Inversion)

3Reliability

If the LAA neck is twisted around the shaft, then secure fixation and complete obliteration are achieved, but the risk of LAA puncture increases

Engineering Contradiction:

Improvesecure fixationVSAvoidLAA puncture risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The lock mechanism is deployed and engaged with the LAA ostium before the framework expansion and twisting actions are completed. This preliminary engagement provides a stable anchor point that guides and constrains the twisting motion, ensuring controlled rotation around the shaft while minimizing uncontrolled tissue stress that could lead to puncture.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The implant structure incorporates controlled flexibility and progressive engagement characteristics. The framework expands in a controlled manner with changing radial and axial parameters, allowing gradual tissue accommodation. The lock mechanism engages with controlled force parameters, twisting the LAA neck gradually around the shaft rather than abruptly, thereby achieving secure fixation while minimizing puncture risk through parameter-controlled deformation.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250375204A1Atraumatic implantation and closure of reconstructive LAAC device for safety and efficacy

Publication Date: 2025.12.11 BOSTON SCIENTIFIC SCIMED INC

AI summary

An implant for left atrial appendage closure includes an expandable framework with a collar, a shaft, a rod, and a lock. The expandable framework is configured to expand from a collapsed delivery configuration to an expanded deployed configuration. The shaft is disposed within the collar which is axially moveable relative to the shaft. The rod is disposed within the shaft and is coupled to the collar. The lock is coupled to the shaft and includes an engagement member configured to move between a proximally facing constrained configuration and a distally facing radially expanded configuration. The rod is coupled to the collar such that rotation of the rod pulls the collar and expandable framework proximally over the shaft toward the lock, and the expandable framework is configured to rotate and move axially independently of the lock.