Endograft Delivery Device Trigger Wire Mechanism
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Solution Overview
Problem
Endovascular delivery devices require significant expertise and experience for successful deployment of endografts, making the process less intuitive and prone to errors due to complex manual operations.
Innovation Solution
A delivery device assembly with a proximal and distal handle system, trigger wires, and a tip assembly slider that allows for controlled release of endografts, simplifying the deployment process by enabling intuitive and foolproof operation through a series of sliding movements and trigger actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional delivery devices are used, then endograft deployment can be achieved, but the operation requires significant expertise and experience, making it complex and prone to errors
Solution Approach 1:
The handle assembly is divided into distinct modular components: outer handle portion, inner handle portion, tip assembly slider, and trigger wire release slider. Each component performs a specific function and can be independently manipulated, reducing cognitive load and improving operational clarity while maintaining deployment reliability
Solution Approach 2:
The trigger wires are pre-configured and connected to the endograft retention mechanism before the procedure. The sliders are pre-positioned to control the sequence of wire release. This preliminary setup eliminates the need for complex real-time decisions during deployment, making the procedure more intuitive and foolproof
2Ease of operation
If manual operations are simplified, then ease of operation improves, but control precision over endograft release may be compromised
Solution Approach 1:
Trigger wires serve as intermediaries between the simple slider movements and the complex endograft release mechanism. The wires transmit the operator's input forces precisely to the retention points, ensuring that intuitive slider operations translate into controlled, accurate endograft deployment without compromising placement precision
Solution Approach 2:
The trigger wire system is designed to automatically engage and disengage at predetermined positions during slider movement. This self-regulating mechanism ensures precise control of endograft release without requiring the operator to make fine adjustments, maintaining both ease of operation and placement accuracy
Data Source
AI summary
An endovascular delivery device comprises an outer handle with a track; an inner handle moveable relative to the outer handle; a tip assembly slider mounted on the track; the tip assembly having a top cap and a retriever, the top cap comprising a mouth receiving a proximal portion of the endograft and closable by the retriever; a connector extending from the tip to the inner handle and including a distal portion slidably engaging the inner handle; a pusher catheter extending from the outer handle assembly; a guidewire catheter; a distal trigger wire operable to release the distal end of the endograft; a proximal trigger wire release slider mounted on the track and movable from an initial to a triggered position, wherein the tip assembly slider engages the trigger wire release slider to prevent distal movement until the trigger wire release slider is moved distally.