Stent Delivery Rack and Clip Structure for Accurate Deployment
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Solution Overview
Problem
Existing stent delivery systems face challenges in achieving accurate and efficient deployment due to issues such as deformation of intermediate shafts during sheath retraction, leading to potential misplacement of stents.
Innovation Solution
The stent delivery system incorporates a rack member with varying axial slot widths and a clip mechanism to secure the inner member, reducing deformation of the intermediate shaft and maintaining precise stent positioning through enhanced structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional stent delivery system is used, then the deployment process can be completed, but deformation of the intermediate shaft occurs during sheath retraction leading to misplacement of the stent
Solution Approach 1:
The delivery system is divided into distinct functional segments: an inner member with stent receiving region, an intermediate shaft, a deployment sheath, and a rack member with axial slots. This segmentation allows each component to perform its specific function while maintaining overall system stability during deployment
Solution Approach 2:
The intermediate shaft acts as an intermediary component between the inner member and deployment sheath, providing structural support and maintaining alignment during sheath retraction. The rack member with varying axial slot widths serves as a mediator to control and guide the deployment process, preventing shaft deformation
2Measurement precision
If the axial slot width is reduced to prevent shaft deformation, then stent placement accuracy improves, but the clip mechanism becomes more difficult to assemble
Solution Approach 1:
The axial slot width is made variable rather than constant, with different widths at different positions along the rack member. The slot has a first width in a first region and a second width in a second region, allowing the structure to adapt to different assembly and operational requirements
Solution Approach 2:
Different regions of the axial slot have different widths tailored to specific functions: a wider first region facilitates clip assembly and guidewire insertion, while a narrower second region provides structural support and prevents deformation during deployment
3Stability of the object's composition
If a rigid structure is used to maintain shaft stability, then deformation is reduced, but the device complexity increases
Solution Approach 1:
The intermediate shaft and rack member are designed to perform multiple functions: providing structural support, guiding the deployment sheath, maintaining alignment, and facilitating controlled retraction. This multi-functionality reduces the need for additional components, thereby managing system complexity
Data Source
AI summary
Stent delivery systems as well as methods for making and using stent delivery systems are disclosed. An example stent delivery system may include an elongate shaft including an inner member having a stent receiving region, a deployment sheath slidably disposed along the inner member, and an intermediate shaft disposed between the inner member and the deployment sheath. A handle may be coupled to the elongate shaft. A rack member may be coupled to the deployment sheath. The rack member may have a central bore and an axial slot formed therein. A clip may be coupled to the handle. The clip may have a neck region extending through the axial slot and a cuff region disposed within the central bore. The neck region may have a neck width, the cuff region may have a cuff width, and the neck width may be smaller than the cuff width.