Leaflet Modification Tools for Prosthetic Heart Valve Implantation
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Solution Overview
Problem
Existing methods for implanting prosthetic heart valves face challenges such as coronary artery obstruction and improper mounting due to the geometry of native or previously implanted valves, particularly in cases of abnormal aortic valves, which can lead to reduced hemodynamic performance and increased risk of complications like aortic insufficiency and vascular occlusion.
Innovation Solution
The development of tools and methods to modify existing valvular structures by piercing, lacerating, or cutting leaflets or commissures of native or prosthetic heart valves to ensure proper blood flow to coronary arteries and facilitate the installation of new prosthetic valves, using tools with filters to trap debris and accommodate non-circular geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If lacerating existing leaflets is performed to facilitate prosthetic valve implantation, then ease of manufacture is improved, but reliability deteriorates due to increased risk of aortic insufficiency and vascular occlusion
Solution Approach 1:
A cutting tool with a filter system acts as an intermediary device between the cutting action and the bloodstream. The filter captures debris generated during leaflet laceration, preventing it from entering the bloodstream and causing vascular occlusion or stroke, while still allowing the necessary cutting action to proceed
Solution Approach 2:
The cutting tool converts the potentially harmful action of lacerating calcified leaflets (which could release debris) into a beneficial procedure by simultaneously filtering the debris. The harmful debris generation is transformed into a controllable process where debris is captured and prevented from causing harm
2Manufacturing precision
If high spatial precision is required for lacerating leaflets, then manufacturing precision is improved, but device complexity increases due to the need for high surgical skill
Solution Approach 1:
The cutting tool includes self-positioning features such as a positioning member that engages with the valve frame or annulus to automatically locate the correct cutting position. This self-service mechanism reduces the burden on the surgeon to manually achieve precise positioning, thereby reducing the skill requirement while maintaining manufacturing precision
Solution Approach 2:
The tool replaces complex manual mechanical positioning with a simplified mechanical guidance system. The positioning member and guide structures provide automatic alignment, substituting the need for complex surgeon skill with a straightforward mechanical guidance mechanism
3Adaptability or versatility
If prosthetic valve is implanted within non-circular BAV geometry, then adaptability is improved, but reliability deteriorates due to increased risk of annular rupture and reduced hemodynamic performance
Solution Approach 1:
The cutting tool employs asymmetric cutting patterns that adapt to the non-circular geometry of bicuspid aortic valves. By making asymmetric modifications to the leaflets rather than uniform circular cuts, the tool accommodates the natural asymmetric geometry of BAV while maintaining structural integrity and preventing annular rupture
Solution Approach 2:
The cutting tool applies localized modifications at specific positions on the leaflets rather than uniform treatment. This local quality approach allows the procedure to adapt to the specific non-circular geometry of each BAV case, making cuts where they are most needed while preserving structural strength in critical areas
4Ease of operation
If existing leaflets are lacerated to allow coronary access, then ease of operation is improved, but object-generated harmful factors increase due to debris release into bloodstream
Solution Approach 1:
The filter system acts as an intermediary between the cutting action and the bloodstream, capturing debris generated during leaflet laceration. This intermediary structure allows coronary access to be achieved through leaflet modification while preventing the harmful debris from entering the bloodstream and causing vascular occlusion or stroke
Data Source
AI summary
Methods and tools for implanting prosthetic heart valves and modifying leaflets of an existing valvular structure in a subject are disclosed herein. Prior to or during implantation of the prosthetic heart valve within the existing valvular structure, each tool can be provided in the ascending aorta (or equivalent thereof) of a subject and can be used to pierce, lacerate, slice, tear, cut or otherwise modify a leaflet or commissure of the existing valvular structure. The existing valvular structure can be a native aortic valve or other native heart valve, or a previously-implanted prosthetic heart valve. The modification can avoid, or at least reduce the likelihood of, issues that leaflets of the existing valvular structure might otherwise cause once the prosthetic heart valve has been fully installed, for example, obstruction of blood flow to the coronary arteries and/or improper valve mounting due to a non-circular cross-section.