Stent Delivery Device Push-Pull Mechanism for Challenging Anatomy
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Solution Overview
Problem
Current medical delivery devices for stent deployment in challenging anatomy, such as small spaces or narrow lumens, often rely solely on retraction mechanisms, which can lead to incorrect placement angles, deployment too far proximally, or deployment within the wrong channel.
Innovation Solution
The delivery device incorporates a handle housing, a handle actuator, a puller member, a pusher member, an inner member, and an outer sheath, allowing for both distal push and proximal pull mechanisms to deploy the stent, providing more precise control and placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If solely retraction mechanism is used to deploy stent, then device complexity is reduced, but placement precision deteriorates
Solution Approach 1:
The delivery device is segmented into multiple independent components: an outer sheath for proximal retraction, an inner shaft for distal advancement, and a stent positioned between them. This segmentation allows independent control of each component, enabling precise stent deployment at the target location while maintaining manageable device complexity through modular design
Solution Approach 2:
The delivery device transitions from a static retraction-only mechanism to a dynamic system capable of both proximal retraction and distal advancement. The inner shaft can be advanced distally to push the stent into position, while the outer sheath can be retracted to expose the stent. This dynamic capability provides precise control over stent placement angle and position, resolving the contradiction between simplicity and precision
2Ease of operation
If retraction-only mechanism is used, then ease of operation is improved, but adaptability to challenging anatomy deteriorates
Solution Approach 1:
The device incorporates dynamic movement capabilities where the inner shaft can be advanced distally to reach challenging anatomical locations and push the stent into position. The outer sheath can be retracted to expose the stent. This dynamic operation allows the device to adapt to various anatomical configurations including narrow lumens, small spaces, and complex angles while maintaining ease of operation through straightforward push-and-retract motions
Solution Approach 2:
The delivery device is designed with multi-functionality to handle diverse anatomical challenges. The same basic device can access different body lumens and anatomical regions by adjusting the relative positions of the inner shaft and outer sheath. This universal design enables deployment in challenging anatomy such as the gastrointestinal tract, urinary tract, and other narrow or angular passages
Data Source
AI summary
Delivery devices, systems and procedures are disclosed, for delivering an implant, such as a stent, including an outer sheath, an inner member slideably disposed within the outer sheath, a handle housing and a handle actuator slideably disposed within the handle housing, a pusher member with inner member attached that is pushable distally relative to the handle actuator to extend the inner member relative to the outer sheath, and a puller member with outer sheath attached pullable proximally relative to the handle actuator to retract the outer sheath relative to the outer sheath.