Guide Wire-Locked Stent Delivery for Precise Endovascular Positioning
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Solution Overview
Problem
Conventional delivery systems for endovascular grafts lack accuracy and efficiency in positioning covered stents, leading to suboptimal deployment and potential complications.
Innovation Solution
A delivery apparatus and system featuring a sheath assembly with a guide wire channel and limiting mechanism, combined with a semi-releasing apparatus and guide wires, ensuring precise control and positioning of the stent during deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional delivery system is used, then the structure is simple, but the positioning accuracy of the covered stent is poor
Solution Approach 1:
The delivery system employs a nested structure where the inner core tube is positioned within the push tube, and the sheath surrounds the push tube. The guide wire runs through the guide wire channel in the push tube, with the limiting mechanism on the tip containing the guide wire end. This nested arrangement allows multiple functional components to be integrated in a compact configuration, improving positioning accuracy without excessive complexity increase.
Solution Approach 2:
The guide wire serves as an intermediary element that connects the limiting mechanism on the tip to the covered stent. The limiting mechanism detachably connects to the guide wire, and the guide wire extends through the guide wire channel in the push tube. This intermediary connection enables precise positioning and control of the stent during delivery while maintaining system manageability.
2Productivity
If a conventional delivery system is used, then the device is easy to operate, but the release speed and accuracy of the covered stent is insufficient
Solution Approach 1:
The delivery system incorporates dynamic components including the sheath that can move axially relative to the push tube, and the limiting mechanism that can detachably connect to and disconnect from the guide wire. These dynamic elements enable rapid stent release when needed, improving productivity while maintaining operational control through the coordinated movement of sheath and push tube components.
Solution Approach 2:
The guide wire is pre-positioned through the guide wire channel in the push tube before stent deployment. The limiting mechanism is pre-configured on the tip to detachably connect to the guide wire. This preliminary arrangement ensures that when deployment is required, the stent can be released quickly and accurately without complex real-time adjustments, balancing speed and ease of operation.
3Measurement precision
If the guide wire is not securely connected, then the device structure is simple, but the guide wire shifts affecting positioning precision
Solution Approach 1:
The limiting mechanism on the tip provides a secure mechanical connection to the guide wire through detachable engagement. This mechanical connection prevents guide wire shifting during delivery while maintaining relative simplicity by using a focused connection mechanism at the tip rather than complex constraints throughout the entire delivery system.
Data Source
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AI summary
A delivery apparatus includes a sheath assembly, a tip, and a handle assembly. The sheath assembly includes an inner core tube, a push tube surrounding and receiving the inner core tube, and a sheath surrounding and receiving the push tube and capable of moving axially relative to the push tube. The tip is connected to the distal end of the inner core tube. The handle assembly is connected to the proximal end of the sheath. A tube cavity channel for the inner core tube to extend through is provided within the push tube. A guide wire channel also is provided in the push tube. A limiting mechanism is provided on the tip and is used for being detachably connected to a guide wire extending through the guide wire channel.