Helical Trigger Wire Prosthesis Delivery System
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Solution Overview
Problem
Current endovascular prosthesis delivery systems face challenges in maintaining a low delivery profile, which complicates access and deployment, especially in smaller vascular systems, and increases the risk of complications during procedures.
Innovation Solution
A delivery device system utilizing an inner cannula with a prosthesis secured by helically wound trigger wires that can transition from a radially inwardly contracted low profile configuration to a radially outwardly expanded configuration, allowing for a compact delivery profile and simplified navigation and deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a conventional prosthesis delivery system is used, then the prosthesis can be delivered to the target site, but the delivery profile is large which complicates access and deployment in smaller vascular systems
Solution Approach 1:
The prosthesis is nested within an inner cannula in a radially inwardly contracted configuration, allowing the delivery system to achieve a low delivery profile that can navigate smaller vascular systems while maintaining the capability to deploy the full-sized prosthesis at the target site
2Length of moving object
If the prosthesis is secured in a radially inwardly contracted configuration, then the delivery profile is reduced, but the mechanism to maintain and release this configuration becomes more complex
Solution Approach 1:
The trigger wires are configured to transition between tensioned and relaxed states, dynamically controlling the prosthesis configuration. When tensioned, they maintain the radially inwardly contracted low profile delivery configuration; when released, they allow radial expansion for deployment, providing a simple yet effective mechanism for configuration control
3Length of moving object
If helical trigger wires are used to secure the prosthesis, then the prosthesis can be retained in a low profile configuration, but the wires must be precisely controlled to prevent premature release
Solution Approach 1:
The trigger wires are pre-configured in a tensioned state during delivery, automatically maintaining the prosthesis in the radially inwardly contracted low profile configuration without requiring active control. The tensioned state is maintained throughout the delivery process, ensuring reliable retention until the intended deployment point is reached
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 system enables efficient and safe deployment of endovascular prostheses in smaller vascular systems by maintaining a low delivery profile, reducing complications and improving access, particularly beneficial for patients with smaller vessels or specific populations like children and certain Asian demographics.
Implementation Method 1
a first trigger wire having a tensioned condition and a relaxed condition and extending longitudinally and circumferentially about the prosthesis in a helical configuration from the proximal end of the prosthesis to the distal end of the prosthesis; a second trigger wire having a tensioned condition and a relaxed condition and extending longitudinally and circumferentially about the prosthesis in a helical configuration
Implementation Method 2
wherein when the first and second helical trigger wires are in the tensioned condition, the prosthesis is releasably secured to the inner cannula in the radially inwardly contracted low profile delivery configuration
Implementation Method 3
a first configuration in which the prosthesis is releasably secured to the inner cannula in a radially inwardly contracted low profile delivery configuration and a second configuration in which the prosthesis is at least partially radially outwardly expanded
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A delivery device system for delivering a low profile prosthesis and a method for releasably retaining a prosthesis on the device are described. The delivery device comprises a prosthesis disposed about the proximal end of the inner cannula (108). In a first configuration the prosthesis is releasably secured to the inner cannula (108) in a radially inwardly contracted low profile delivery configuration and in a second configuration the prosthesis is at least partially radially outwardly deployed. First and second trigger wires (142) extend longitudinally and circumferentially about the prosthesis in helical configurations. The first trigger wire (142) is helically wound in a clockwise direction and the second trigger wire (142) is helically wound in a counter-clockwise direction. When the first and second helical trigger wires are in a tensioned condition, the prosthesis is releasably secured to the inner cannula (108) in a radially inwardly contracted low profile delivery configuration.