Stent Release Assembly for Accurate Endovascular Positioning
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Solution Overview
Problem
The challenge of accurately positioning a vascular stent during endovascular repair due to unstable instrument operations and complex vascular structures often results in the stent being released at an inaccurate position, leading to release failure.
Innovation Solution
A stent delivery and release device with a stent proximal end release assembly and a control member that allows for repeated folding and release of the stent, ensuring accurate positioning by adjusting the axial length of the control member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the stent is delivered via a delivery system through complex vascular structures, then the stent can reach the lesion site, but the stent may be released at an inaccurate position due to unstable instrument operations
Solution Approach 1:
The delivery system incorporates imaging devices that provide real-time feedback on stent position during delivery. The system allows the surgeon to monitor the stent's location and make adjustments before release, ensuring accurate positioning. The feedback mechanism includes visual confirmation of stent placement relative to the lesion site, enabling precise control over where the stent is released.
Solution Approach 2:
The system performs preliminary positioning and verification of stent location before the actual release. The stent is delivered to the target area and held in place by the delivery system, allowing time for imaging verification and positional adjustment. Only after confirming accurate positioning does the system proceed with stent release, preventing premature or inaccurate deployment.
2Ease of operation
If the delivery system is designed for minimally invasive insertion via femoral artery, then patient trauma is reduced, but the surgical field becomes narrow making precise control difficult
Solution Approach 1:
The delivery system is divided into multiple functional segments: the catheter for arterial access, the guide wire for navigation, the stent delivery mechanism, and the release mechanism. Each segment can be independently controlled and positioned, allowing precise manipulation despite the narrow access route. The segmented design enables the stent to be delivered through the femoral artery while maintaining control over its final placement position.
3Productivity
If the stent is released prematurely due to unstable operations, then the procedure can be completed, but the stent is implanted at an inaccurate position causing subsequent problems
Solution Approach 1:
The system requires preliminary verification of stent position using imaging devices before allowing release. The stent is delivered to the target area and held in a controlled manner, giving the surgeon time to verify positioning accuracy. The system prevents premature release by maintaining mechanical control until positioning is confirmed, ensuring accurate implantation while still enabling procedure completion.
Solution Approach 2:
Real-time imaging feedback allows the surgeon to verify stent position before release. The system provides visual confirmation that the stent is correctly positioned at the lesion site, preventing premature or inaccurate implantation. This feedback mechanism ensures that the procedure can be completed successfully with accurate stent placement.
Data Source
AI summary
Disclosed are a stent delivery and release device and a stent delivery and release system. The stent delivery and release device (20) includes a stent proximal end release assembly provided at a proximal end of the stent delivery and release device, a guide head provided at a distal end of the stent delivery and release device, and a control member, wherein an external stent is configured to be loaded between the guide head and the stent proximal end release assembly; a proximal end of the control member is connected to the stent proximal end release assembly, and at least part of a distal end of the control member is wound around the stent and is detachably connected to the guide head; and the stent proximal end release assembly folds or releases the stent by controlling the axial length of the control member.