Lumen Stent Delivery System Fixing Anchor Grooves
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Solution Overview
Problem
Current lumen stent delivery systems face challenges in safely withdrawing the stent after it has been released, as the delivery system can hook the released stent, leading to movement and increased operational risk during interventional procedures for treating aortic aneurysms and dissections.
Innovation Solution
A delivery system featuring a fixing anchor and barrel-shaped fixing cap with positioning grooves and limiting members that securely restrain the connection parts of the lumen stent, preventing hooking and ensuring safe withdrawal by maintaining radial and axial restraint until the stent is fully released and expanded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the delivery system uses connection parts to fix the lumen stent during release, then the stent stability during release is improved, but the delivery system may hook the released stent during withdrawal
Solution Approach 1:
The delivery system performs preliminary actions by maintaining the connection parts engaged with the stent during the release process, ensuring complete expansion and stabilization before detachment. This preliminary engagement prevents premature disengagement and ensures the stent is fully deployed before the delivery system withdraws, eliminating the hooking problem.
Solution Approach 2:
The design incorporates a controlled detachment mechanism that prepares for safe separation in advance. The connection parts are designed to disengage smoothly after the stent is fully expanded, preventing sudden movements or hooking during withdrawal. This beforehand preparation ensures a safe transition from the engaged to detached state.
2Stability of the object's composition
If the connection parts are fixed in the delivery system during release, then movement during release is prevented, but operational risk increases during withdrawal
Solution Approach 1:
The connection parts transition from a fixed, constrained state during delivery and release to a detached, free state after expansion. This dynamic change allows the system to maintain stability when needed (during release) while enabling safe withdrawal afterward. The connection mechanism is designed to be temporarily engaged during critical phases and then smoothly disengage.
Solution Approach 2:
The delivery system maintains the connection parts engaged during the release process to ensure complete stent expansion and stabilization before detachment. This preliminary engagement phase ensures the stent is fully deployed and stable before the connection parts are released, preventing movement during withdrawal while maintaining operational reliability.
3Manufacturing precision
If the lumen stent is released before connection parts are separated, then complete expansion is achieved, but delivery system withdrawal becomes unsafe
Solution Approach 1:
The system ensures the lumen stent is completely expanded and stabilized while the connection parts remain engaged with the delivery system. Only after this preliminary expansion phase is complete does the detachment occur, ensuring full deployment before withdrawal begins. This sequence prevents incomplete expansion while maintaining withdrawal safety.
Solution Approach 2:
The design incorporates a controlled detachment mechanism that prepares for safe separation after complete expansion. The connection parts are designed to disengage smoothly only after the stent is fully expanded, preventing sudden movements or hooking during withdrawal. This beforehand preparation ensures complete expansion is achieved while maintaining withdrawal safety.
Data Source
AI summary
A delivery system (200) for delivering a lumen stent (100). The delivery system (200) comprises a fixing anchor (270) and a fixing cap (260) which is cylindrical and has an opening at a proximal end, the fixing anchor (270) comprising a hollow insertion part (271) and an abutment part (273) connected to the insertion part (271); parts of the side surface of the insertion part (271) are recessed towards the interior of the insertion part (271) to form a plurality of positioning grooves (2711) that extend to a proximal end surface of the insertion part (271), a separator (2713) being formed between every adjacent two positioning grooves (2711); the abutment part (273) comprises a carrier (2731) and a plurality of first position-limiting pieces (2733) provided on a side of the carrier (2731), a distal end of each first position-limiting piece (2733) being provided to correspond to an open side of a positioning groove (2711) adjacent to the abutment part (273); distal end surfaces of the plurality of first position-limiting pieces (2733), a distal end surface of the carrier (2731) and proximal end surfaces of the separators (2713) are coplanar. When the fixing anchor (270) and the fixing cap (260) are joined, the insertion part (271) is inserted into the fixing cap (260), and the distal end surfaces of the first position-limiting pieces (2733) abut the proximal end surface of the fixing cap (260). Further disclosed is a lumen stent system. The delivery system (200) can be smoothly and safely withdrawn out of the human body.