Control Handle Trigger Ratcheting for Precise Prosthesis Deployment
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Solution Overview
Problem
Current push-pull delivery devices for self-expanding prostheses lack control and accuracy during deployment, often resulting in premature deployment in incorrect positions within the body lumen, and require two hands for operation, limiting the physician's ability to perform other tasks during the procedure.
Innovation Solution
A delivery device with a control handle that allows incremental and controlled retraction of the outer sheath using a trigger mechanism with ratcheted engagement, enabling one-handed operation and precise deployment of the prosthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional push-pull delivery device is used, then the prosthesis can be deployed, but the physician cannot precisely control the deployment position and may inadvertently pull back too far causing premature deployment
Solution Approach 1:
The delivery device is segmented into an inner catheter and an outer catheter that can move independently relative to each other. The prosthesis is positioned between these two catheters, allowing the outer catheter to be retracted independently to deploy the prosthesis at a precise location while the inner catheter remains stationary for support.
Solution Approach 2:
The device incorporates a ratcheting mechanism that provides tactile feedback to the physician during outer catheter retraction. The ratchet teeth engage with each other to prevent the outer catheter from being pulled back too far, giving the physician feedback on the deployment position and preventing premature deployment.
2Ease of operation
If manual retraction of the outer catheter is used, then the prosthesis can be deployed, but the retraction is coarse and difficult to control precisely
Solution Approach 1:
The outer catheter is designed to be dynamically retractable relative to the inner catheter. The ratcheting mechanism allows the outer catheter to move freely in the retraction direction while preventing unwanted movement in the opposite direction, providing dynamic control that is both easy to operate and precise.
3Ease of operation
If two hands are used to operate the push-pull mechanism, then the prosthesis can be deployed, but the physician cannot perform another task simultaneously
Solution Approach 1:
The inner and outer catheters are merged into a single integrated delivery device structure. The inner catheter provides a stable base while the outer catheter handles the deployment function, allowing the physician to operate the device with one hand while performing other tasks with the other hand, thereby improving procedural efficiency.
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
The solution provides increased control and accuracy in deploying the prosthesis, allowing for precise placement and reducing the risk of premature deployment, while enabling single-handed operation to facilitate more efficient procedural workflows.
Implementation Method 1
The movable member is ratchedly engaged to the trigger rack and the stationary rack. The ratcheted engagement of the movable member with the trigger and the stationary racks is configured to proximally retract the elongate sheath.
Data Source
AI summary
A delivery device for deploying an expandable prosthesis and method of use are described. The delivery device comprises a handle that comprises a trigger. Activation of the trigger enables incremental retraction of an outer sheath to expose a self-expanding prosthesis. Activation and subsequent deactivation of the trigger causes a movable member to ratchedly engage with a stationary rack and a trigger rack.