Defect-Closure Device With Elastic Protrusion for Secure Positioning
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Solution Overview
Problem
Existing defect-closure devices for conditions like patent foramen ovale (PFO) face challenges with complex structures, high foreign material area, risk of blood clot adherence, and displacement of anchoring members, leading to incomplete closure and potential tissue deformation during deployment.
Innovation Solution
A defect-closure device with a free enlargement-contraction mechanism, comprising a first member and a second member with a protruded part that elastically contacts the opening edge, ensuring secure positioning and minimal area contact, combined with a delivery apparatus using an operation wire and hooking member for safe deployment without force exertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pair of disk-like membranes is used to close the defect from both sides, then the closure effectiveness is improved, but the structure becomes complicated and the area of foreign material increases, leading to easier blood clot adherence
Solution Approach 1:
The invention extracts only the necessary closure function by using a single disk-like membrane instead of a pair, removing the redundant right atrial side membrane while maintaining effective closure through the protrusion part's elastic contact mechanism
Solution Approach 2:
The device is segmented into functional components: the first disk-like membrane for left atrial closure, the protrusion part for elastic contact and positioning, and the wire rod for structural support, allowing each component to perform its specific function efficiently
2Reliability
If disk-like membranes and wire anchor members are used for indwelling and sandwiching, then the closure capability is improved, but the risk of displacement due to non-fixed position increases
Solution Approach 1:
The protrusion part automatically engages with the opening edge through elastic contact, creating a self-fixing mechanism that stabilizes the device position without requiring additional anchoring structures or complex fixation procedures
Solution Approach 2:
The protrusion part's curved geometry allows it to flexibly contact and engage with the opening edge, providing stable positioning through elastic deformation while maintaining the simplicity of the overall structure
3Ease of operation
If a screw mechanism is used for device release in conventional delivery apparatus, then the delivery function is achieved, but force is exerted on the device causing displacement of indwelling position and tissue deformation
Solution Approach 1:
The invention replaces the screw mechanism with a balloon expansion system, where a balloon is inflated to push the device into the defect and then deflated to release it, eliminating the need for direct mechanical force application that causes tissue deformation
Solution Approach 2:
The balloon acts as an intermediary medium between the delivery apparatus and the closure device, transferring force indirectly through fluid pressure to achieve device positioning and release without direct mechanical contact that would cause tissue damage
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
The solution provides a simple, secure closure of passage-like defects with reduced risk of blood clot generation and tissue deformation, ensuring the device remains fixed at the intended position, and facilitates safe and precise delivery without displacing the closure device.
Implementation Method 1
a protrusion part 7 which protrudes from an opening Ol at the other end in an axis direction of the defect O, wherein the first member 1 is elastically contacted to the opening by elastically contacting the protrusion part 7 of the second member 2 to the inner surface of the opening edge of the opening Ol
Data Source
AI summary
Provided is a defect-closure device which is surely retainable in a predetermined position to close a passage-like defect in a living body. The device may have a free enlargement-contraction first member mounted so as to close an opening at the one end of the defect; and a free enlargement-contraction second member having a protruded member, which extends from a joint part jointed to the first member, and protrudes from an opening at the other end in an axis direction of the defect. The first member is elastically contacted to the opening by elastically contacting a protrusion part of a second member to the inner surface of an edge of the opening.