Stent Delivery System with Positioning Mark for Accurate Placement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current stent delivery systems face challenges in accurately positioning stents due to issues of stent length, leading to incomplete coverage of lesions or interference with bifurcated vessels, resulting in inaccurate distal positioning and potential occlusion of bifurcated vessels.
Innovation Solution
A stent delivery system comprising a movable and fixed sheathing canal with a guide wire, stent length buckle, and contrast side holes, allowing for precise positioning of the stent by preventing excessive shortening or lengthening during deployment, ensuring complete coverage of lesions without affecting bifurcated vessels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the stent is loaded into the delivery sheathing canal by segment-by-segment extrusion, then the stent can be delivered through the artery, but the stent radially shrinks and shortens in the axial direction, leading to inaccurate positioning
Solution Approach 1:
The patent applies preliminary action by pre-marking the sheathing canal at a distance equal to the stent length from the front end. This marking is created before stent deployment, establishing a reference point that will indicate the correct release position. When the marked position reaches the target lesion location, the stent is released, ensuring accurate positioning despite the stent's axial shortening during compression and deployment.
2Adaptability or versatility
If the stent is compressed to fit the delivery canal, then the stent can be loaded and delivered, but the stent length changes, causing incomplete coverage or interference with bifurcated vessels
Solution Approach 1:
The patent uses the sheathing canal as an intermediary measuring tool. The canal is marked at a specific distance from its front end, equal to the stent's uncompressed length. This marking serves as a mediator between the stent's compressed state in the delivery system and its final deployed position, allowing operators to accurately determine when to release the stent to achieve complete lesion coverage without affecting bifurcated vessels.
3Ease of operation
If the stent release position is not accurately controlled, then the delivery process is simple, but the stent may be too long or too short, affecting surgical effectiveness
Solution Approach 1:
The patent employs visual marking (a form of color/contrast change) on the sheathing canal to indicate the precise release position. The marked position on the sheathing canal corresponds to the stent's front end when the stent is fully compressed. This visual indicator allows operators to easily identify the correct release point, ensuring accurate stent placement while maintaining simple delivery operations.
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 accurate positioning of the stent, preventing incomplete coverage or interference with bifurcated vessels, thereby enhancing surgical effectiveness and ensuring smooth withdrawal of the sheath after stent release.
Implementation Method 1
the nickel-titanium alloy stent itself has a shape memory function, the stent is loaded into the outer sheathing canal by segment-by-segment extrusion, in this process, the stent radially shrinks to the same size as the lumen of the delivery sheathing canal
Data Source
AI summary
The invention discloses a stent delivery system capable of accurately positioning. The system comprises a movable sheathing canal, a fixed sheathing canal and a stent, the fixed sheathing canal is used for fixing stent, the movable sheathing canal comprises a handle, a stent length buckle, an inner sheathing canal, a sheathing canal inclined part, an outer sheathing canal and an outer sheathing positioning marking part, and the sheathing canal inclined part and the outer sheathing canal are integrally formed, and are arranged at front end of inner sheathing canal. The invention provides an accurate-positioning proximal end pre-release stent delivery system and method, which is simple in structure and convenient to use. The invention can realize accurate positioning of the proximal-end of the stent, that is, the invention can prevent stent from being too long or too short due to proximal-end inaccurate release of the stent through proximal-end accurate positioning.