Transcatheter prosthetic atrioventricular valve
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Transcatheter prosthetic atrioventricular valves face challenges in minimizing conduction disturbances, achieving effective fixation, and facilitating recapture due to their large size and complex structure, particularly when replacing mitral and tricuspid valves.
Innovation Solution
The design includes a collapsible and expandable prosthetic atrioventricular valve with a cylindrical inner stent and outer stent, featuring a unique arrangement of posts and connectors to minimize metal-to-tissue contact, allowing self-expansion and alignment with the heart's conduction system, and a retrieval system using flexible control members for recapture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transcatheter prosthetic atrioventricular valve is expanded into the native valve, then effective fixation is achieved, but conduction disturbances occur due to pressure on surrounding tissue
Solution Approach 1:
The stent is divided into multiple segments or sections along its length, with certain segments designed to be more compliant or flexible than others. This segmentation allows the stent to apply fixation pressure at specific locations while leaving other areas compliant to avoid compressing conduction tissue, thus resolving the contradiction between effective fixation and avoiding conduction disturbances
Solution Approach 2:
Different portions of the stent are given different mechanical properties - some sections are made more rigid for secure fixation while other sections are made more compliant to avoid damaging surrounding conduction tissue. This local differentiation of material properties or structural characteristics allows the stent to simultaneously achieve reliable fixation and minimize harmful effects on the conduction system
2Reliability
If the prosthetic valve is made large to replace mitral or tricuspid valves, then effective valve replacement is achieved, but recapture becomes difficult due to large size and forces involved
Solution Approach 1:
The stent is designed with dynamic mechanical properties that allow it to change stiffness or flexibility based on operational phase. During deployment, the stent is rigid to maintain position and provide effective valve replacement, but during recapture, the stent becomes more flexible or collapsible to reduce resistance and facilitate retrieval, thus resolving the contradiction between effective valve replacement and ease of recapture
3Strength
If the stent structure is made complex to provide both outer anchoring and inner leaflet support, then structural integrity is improved, but device complexity increases
Solution Approach 1:
The invention integrates multiple structural functions into a single unified stent structure. The stent simultaneously provides outer anchoring features for secure fixation and inner support features for leaflet attachment, eliminating the need for separate outer and inner stents. This merging of functions maintains structural integrity while reducing overall device complexity
Data Source
AI summary
A collapsible and expandable prosthetic atrioventricular valve may include an outer stent, an inner stent, and a plurality of prosthetic leaflets mounted within the inner stent. The outer stent may have an atrial disc, a ventricular disc, and a plurality of posts coupling the atrial disc to the ventricular disc. A plurality of connectors may extend between the inner stent and the outer stent to couple the inner stent to the outer stent. The outer stent may be devoid of metal in a space circumferentially extending between adjacent ones of the plurality of posts. The space may extending approximately one half, approximately one third, or approximately one fourth of a circumference of the outer stent.