Adjustable Occluder for PFO with Long Overlap
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Solution Overview
Problem
Traditional PFO occluders are inadequate for treating PFOs with long overlaps between the septum primum and septum secundum, leading to residual diffluence and thrombosis risks, as they cannot adjust to the anatomical structure of the oval foramen, necessitating long-term anticoagulant therapy and risking embolism.
Innovation Solution
An occluder system comprising two occluding disks and an adjustable tightening thread that passes through the defect, allowing for adjustable length between the disks to adapt to the anatomical structure, reducing residual diffluence and improving attachment to the surrounding tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional PFO occluder with fixed distance between occlusion surfaces is used, then the device structure is simple, but it cannot adjust to the anatomical structure of the oval foramen, leading to residual diffluence in PFOs with long overlap
Solution Approach 1:
The patent applies the dynamics principle by making the distance between occlusion surfaces adjustable rather than fixed. The tightening element allows the occlusion surfaces to be positioned at variable distances apart, enabling the device to adapt to different anatomical structures of the oval foramen, particularly addressing PFOs with long overlap where traditional fixed-distance designs fail to provide adequate occlusion
Solution Approach 2:
The patent implements parameter changes by allowing the distance parameter between occlusion surfaces to be variable. Through the tightening element mechanism, the distance between occlusion surfaces can be adjusted to match the specific anatomical requirements of different patients, transforming a static design into a dynamic parameter-adjustable system
2Reliability
If a traditional PFO occluder is used for PFO with long overlap, then the device structure remains simple, but residual diffluence occurs causing thrombosis risk and requiring long-term anticoagulant therapy
Solution Approach 1:
The adjustable distance mechanism allows the occlusion surfaces to be dynamically positioned to achieve complete occlusion of PFOs with long overlap, eliminating residual diffluence and the associated thrombosis risk that occurs with traditional fixed-distance designs
3Adaptability or versatility
If the distance between occlusion surfaces is fixed in a traditional occluder, then manufacturing is easier, but it is impossible to adjust the length of the waist according to the structure of the oval foramen
Solution Approach 1:
The tightening element is divided into multiple sections including a first section, second section, locking section, and adjusting section. This segmentation allows the tightening element to be manufactured as a modular component with specific functional zones, enabling length adjustment capability while maintaining manageable manufacturing complexity through standardized modular production
Data Source
AI summary
Disclosed is an occluder for occluding a defect in a vasculature. The occluder includes: two occluding disks and a tightening element. The two occluding disks is configured for covering different openings of the defect; wherein the tightening element includes a tightening thread, the tightening thread passing through the defect and being connected to the two occluding disks, the tightening thread has a length between the two occluding disks and the length is adjustable by means of a free end of the tightening thread. Further provided are an occluding system provided with the occluder, a knotting method for the tightening element of the occluder and a method for occluding an oval foramen with the occluder.