Transcatheter Valve Piston Groove Attachment Tabs
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Solution Overview
Problem
Current transcatheter delivery systems for heart valve prostheses face challenges in efficiently deploying and securing the prosthetic valve at the annulus, particularly in maintaining consistent attachment and smooth release of the valve during deployment.
Innovation Solution
The system incorporates a self-expanding valve prosthesis with attachment tabs that are coupled to a delivery system featuring an annular groove or circumferentially-extending grooves on the piston, allowing for radially collapsed configuration and precise alignment for deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the valve prosthesis is crimped down to a small size for transluminal delivery, then the device can be delivered percutaneously through body lumens, but the complexity of loading and alignment increases during deployment
Solution Approach 1:
The attachment tabs are pre-formed with L-shaped configurations and groove receptacles that are prepared in advance for engagement with the piston grooves. This preliminary preparation of the attachment interface simplifies the loading process by eliminating the need for complex real-time alignment during crimping and delivery.
Solution Approach 2:
The piston with its circumferential grooves acts as an intermediary component that facilitates the attachment of the valve prosthesis to the delivery system. The grooves on the piston interface with the attachment tabs, providing a mechanical mediation that simplifies the coupling process and ensures proper alignment during deployment.
2Ease of operation
If the stent frame is self-expanding for automatic deployment, then the deployment process is simplified, but consistent attachment and smooth release during deployment becomes more difficult to control
Solution Approach 1:
The attachment tabs are designed with flexible L-shaped configurations that allow dynamic adjustment during deployment. The tabs can flex and adapt as the self-expanding frame expands, maintaining consistent attachment to the piston while accommodating the changing geometric constraints during the deployment process.
Solution Approach 2:
The attachment interface utilizes changes in geometric parameters during deployment. As the self-expanding frame transitions from compressed to expanded state, the attachment tabs change their spatial configuration and engagement depth with the piston grooves, ensuring consistent attachment throughout the deployment process while allowing smooth release when needed.
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
This configuration enables secure attachment and consistent release of the valve prosthesis, facilitating efficient deployment and reducing the complexity of loading and alignment during transcatheter procedures.
Implementation Method 1
the frame being self-expanding and including a plurality of attachment tabs extending from a first end of the frame
Data Source
AI summary
A system includes a prosthesis and a delivery system for delivery thereof. The prosthesis includes a self-expanding frame and a plurality of attachment tabs extending from a first end of the frame. The delivery system includes a shaft, a piston disposed over the shaft, and a capsule which is movable relative to the piston. The piston includes an annular groove or a plurality of circumferentially-extending grooves on an outer surface thereof. In a delivery configuration of the delivery system, the plurality of attachment tabs are disposed within the annular groove of the piston, or the plurality of circumferentially-extending grooves of the piston, and the capsule covers and constrains the prosthesis in a radially collapsed configuration, with the capsule extending over the annular groove, or the plurality of circumferentially-extending grooves, of the piston and the attachment tabs received therein.