Stent Delivery System Stepwise Outer Sleeve Tip
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Solution Overview
Problem
Existing stent delivery systems require the stent to be placed in the stent cavity in advance, making it difficult to use immediately and affecting the stent's expansion force due to long-term placement, which can impact surgical effectiveness.
Innovation Solution
A stent delivery system with an outer sleeve tip that decreases in diameter stepwise, allowing the stent to be transferred from the stent accommodating tube to the stent placing tube without pre-placing, and a push tube with a larger diameter than the stent placing tube to increase pushing force and reduce gap, enabling immediate use and preserving stent expansion force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the stent is placed in the stent cavity in advance, then the stent delivery system can be prepared for surgery, but the stent cannot be used immediately and its expansion force is affected due to long-term placement
Solution Approach 1:
The stent delivery system is divided into separate functional modules: the stent accommodating tube for storage/transport and the stent placing tube for deployment. This segmentation allows the stent to remain in the accommodating tube during transport and only be transferred to the placing tube immediately before surgery, eliminating long-term placement issues while maintaining preparation capability
Solution Approach 2:
The stent accommodating tube serves as an intermediary storage device that keeps the stent in a ready state without requiring it to be placed in the final deployment position. The stent can be transferred from the accommodating tube to the placing tube immediately before surgery, acting as a mediator between storage and deployment states
2Device complexity
If the push tube has a smaller diameter to fit in the outer sleeve, then the device can be assembled, but the pushing force is insufficient and the gap between tubes is large
Solution Approach 1:
The system uses dynamic adjustment of tube positions rather than fixed sizing. The push tube can be inserted to different depths, and the stent placing tube can extend beyond the outer sleeve tip. This dynamic configuration allows the push tube to have sufficient diameter for force transmission while maintaining assembly compatibility through controlled insertion depth
Solution Approach 2:
The solution moves from a single-dimension (diameter) constraint to multi-dimensional control by considering both radial dimension (tube diameter) and axial dimension (insertion depth). The push tube diameter can be optimized for force transmission, while the effective pushing length is controlled by insertion depth, separating the force transmission requirement from the assembly compatibility constraint
Data Source
AI summary
A stent delivery system is described. The system includes an outer sleeve assembly with an outer sleeve body, an outer sleeve handle fixed to one end of the outer sleeve body, and an outer sleeve tip connected to an opposing end of the outer sleeve body. The system also includes an inner sleeve assembly, which has a push tube sleeved in the outer sleeve body, an inner sleeve handle fixed to the rear end of the push tube, a stent placing tube connected to the front end of the push tube, and an inner sleeve tip set at the front end of the stent placing tube. The system also includes a snap ring fixed on an outer wall of the push tube and provided between the outer sleeve handle and the inner sleeve handle. The outer sleeve tip includes a stepped surface.