Braided Retrieval Device for Embolic Filter Capture
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Solution Overview
Problem
Current retrieval devices for embolic protection filters face challenges in effectively capturing and removing filters and emboli due to limitations in size and profile, which can hinder their delivery and retrieval through the body.
Innovation Solution
A retrieval device with an elongated shaft and a braided member that radially expands to encapsulate the filter, combined with an elastomeric jacket for flexibility and visibility, allowing for axial compression and suction-assisted emboli aspiration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a catheter or sheath is used to retrieve the embolic protection filter, then the filter and emboli can be captured, but the device profile becomes large making delivery through the body difficult
Solution Approach 1:
The retrieval device is divided into multiple functional segments: an elongated shaft for delivery, a collapsible braided member for filter capture, and an elastomeric jacket for encapsulation. Each segment serves a specific function, allowing the device to maintain a low profile during delivery while expanding capture capacity at the target site.
Solution Approach 2:
The braided member is nested within the elastomeric jacket, which itself is contained within the elongated shaft during delivery. This nested configuration allows the device to maintain a compact profile for delivery while enabling sequential deployment of capture and encapsulation functions at the target site.
2Reliability
If the braided member is made larger to effectively trap the filter and emboli, then capture effectiveness improves, but the device complexity increases
Solution Approach 1:
The braided member is constructed as a flexible, collapsible structure that can be compressed axially to radially expand and trap the filter. This flexible shell design provides effective filter capture without requiring a complex rigid structure, maintaining simplicity while achieving the desired trapping capability.
Solution Approach 2:
The braided member utilizes axial compression to induce radial expansion, changing its geometric parameters dynamically. This parameter transformation allows the device to transition from a compact delivery state to an expanded capture state, effectively trapping the filter without requiring a permanently large or complex structure.
3Strength
If the elastomeric jacket is added to encase the filaments, then structural integrity is maintained, but the device profile increases
Solution Approach 1:
The elastomeric jacket serves as a flexible encapsulation layer that maintains structural integrity of the braided member during retrieval. Its elastic properties allow it to conform to the compressed filter while providing necessary mechanical support, achieving strength enhancement without significant profile increase.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the ability to capture and remove embolic protection filters and emboli efficiently, maintaining structural integrity for delivery and retrieval while minimizing profile interference.
Implementation Method 1
The braided member may include a number of filaments configured to radially expand when axially compressed
Implementation Method 2
An elastomeric jacket disposed about at least a portion of the braided member may be used to encase the filaments
Implementation Method 3
A suction force may be applied to the distal end of the retrieval device to aspirate the embolic protection filter and captured emboli into the retrieval device
Data Source
AI summary
A device for retrieving an intravascular device from a body lumen is disclosed. A retrieval device in accordance with an exemplary embodiment of the present invention includes a braided member coupled to an elongated shaft member. The braided member may include a number of filaments defining a radially expandable inner lumen configured to receive and encapsulate the intravascular device therein. An elastomeric jacket disposed about at least a portion of the braided member may encase the filaments.