Stent Insertion System With Deflecting Gear For Precision Release
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Solution Overview
Problem
Braided stents experience significant shortening when released, making precise positioning challenging with existing insertion systems, especially in short areas of stenosis, requiring skilled user handling and limited precision.
Innovation Solution
An insertion system with a movable element coupled to the pushing element, allowing simultaneous proximal movement of the tube and distal movement of the pushing element, enabling precise stent release by coupling the tube's retraction with the pushing element's advancement, facilitated by a deflecting gear, ensuring millimeter-precision positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If braided stents are compressed radially for insertion, then they can be introduced into the vessel easily, but they experience significant shortening when released making precise positioning challenging
Solution Approach 1:
The insertion system employs dynamic coupling between the tube and pushing element that adapts during the release process. The movable element converts the tube's proximal movement into distal advancement of the pushing element, creating a dynamic mechanism that compensates for stent shortening in real-time, thereby maintaining positioning precision despite the stent's dimensional changes upon release
Solution Approach 2:
A movable element acts as an intermediary between the tube and pushing element. This intermediary component receives proximal movement from the tube and transforms it into distal movement of the pushing element through a deflecting gear mechanism, enabling precise control of the stent release process and compensating for shortening effects
2Reliability
If the tube is pulled back to release the stent, then the stent can expand, but the pushing element must be precisely controlled to maintain position
Solution Approach 1:
The system merges the functions of tube retraction and pushing element advancement into a single coupled operation. The movable element combines these two movements so that pulling back the tube automatically advances the pushing element, simplifying the release process while maintaining reliability by ensuring coordinated action of both components
Solution Approach 2:
The movable element serves as a mechanical intermediary that translates the simple action of pulling the tube into the coordinated movement needed for reliable stent release. This intermediary mechanism handles the complexity of synchronizing tube retraction with pushing element advancement, reducing the skill level required for reliable operation
3Measurement precision
If a deflecting gear is used to couple movements, then precision is improved, but the device complexity increases
Solution Approach 1:
The deflecting gear is integrated into the movable element which acts as an intermediary between the tube and pushing element. This intermediary approach localizes the mechanical complexity within a single component that performs the movement transformation, achieving millimeter-precision positioning while containing the complexity rather than distributing it throughout the entire system
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
Enables precise positioning of braided stents with minimal user expertise, allowing for accurate placement in short stenosis areas by converting proximal movement into distal advancement, improving handling and precision during stent release.
Implementation Method 1
a movable element, which is guided in the housing of the grip, is coupled to the pushing element in such a way that, by a movement of the movable element in the proximal direction, the pushing element can at the same time be guided in the distal direction
Data Source
AI summary
The present invention relates to a device for inserting a self-expanding stent into a body vessel. The device comprises a tube, a pushing element and a grip having a housing via which the pushing element is secured on the grip. Further, the device comprises a stent carrier and a moveable element, the latter of which is guided in the housing of the grip and is coupled to the pushing element. Moving the movable element in the proximal direction effects a movement of the pushing element in the distal direction and a movement of the tube in the proximal direction.