Stabilizing Rail Handle for Prosthesis Delivery Torque Control
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Solution Overview
Problem
Existing endovascular prosthesis delivery devices face challenges in providing a stable and precise mechanism for manipulating and deploying stent grafts within vessel lumens, often resulting in inaccurate placement due to torque accumulation and lack of precise control during deployment.
Innovation Solution
A handle assembly with a proximal gripping portion and a stationary gripping portion, featuring a rail system that allows longitudinal movement and prevents independent axial rotation, ensuring a 1:1 ratio of handle rotation to prosthesis rotation, thereby stabilizing the device and facilitating precise placement and deployment of the stent graft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the handle is made sturdy and stable to resist twisting and torque, then manipulation precision is improved, but device complexity increases
Solution Approach 1:
The handle is divided into two separate gripping portions (proximal and distal) that can rotate independently. This segmentation allows each portion to serve a specific function: the distal portion provides stable anchoring while the proximal portion enables precise manipulation, resolving the contradiction between stability and precision without requiring a monolithic complex structure.
Solution Approach 2:
A rail mechanism acts as an intermediary between the two gripping portions. The rail constrains the relative movement between portions to pure rotation along a defined axis, preventing unwanted twisting and torque accumulation while maintaining the simplicity of the overall structure. This intermediary component enables precise control without requiring complex stabilization mechanisms.
2Ease of operation
If the proximal gripping portion is made movable along the longitudinal axis, then deployment control is improved, but structural stability deteriorates
Solution Approach 1:
The proximal gripping portion is designed to be movable along the longitudinal axis of the delivery device, transitioning from a static to a dynamic structure. This allows the operator to control the deployment sequence by moving the proximal portion relative to the distal portion, enabling precise deployment control while maintaining structural integrity through the constrained motion path provided by the rail mechanism.
Data Source
AI summary
A handle assembly for a prosthesis delivery device is disclosed. The handle assembly has a proximal gripping portion and a stationary gripping portion. At least one rail extends distally from the proximal gripping portion through the stationary gripping portion. The proximal gripping portion is distally moveable along a longitudinal axis towards the stationary gripping portion from a first pre-deployment position to a second position. The at least one rail extends proximally from the stationary gripping portion when the proximal gripping portion is in a first pre-deployment position and distally from the stationary gripping portion when the proximal gripping portion is in a second position. The at least one rail is configured to prevent the build-up of torque along the length of the delivery device as well as prevent the build-up of torque among the various components of the handle assembly including the proximal gripping portion and the stationary gripping portion.