Sleeve Pull Back Mechanism for Endoluminal Device Delivery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The deployment of delivery sleeves in endoluminal devices often results in overhang, which can obstruct blood flow and facilitate unwanted tissue growth, as conventional imaging technologies may not detect sleeves and radiopaque markers do not reliably indicate sleeve ends.
Innovation Solution
A delivery system with a delivery sleeve configured to be releasably secured in a tubular shape, featuring deployment line sections that allow for the translation of sleeve edges and corners toward a mid-region, reducing or removing overhang by actuating these lines to retract the sleeve material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a delivery sleeve is used to constrain an endoluminal device during delivery, then the device can be delivered in a constrained configuration suitable for endoluminal delivery, but the delivery sleeve may extend beyond the end of the endoluminal device resulting in overhang that can obstruct blood flow and facilitate unwanted tissue growth
Solution Approach 1:
The patent applies preliminary action by incorporating a retraction mechanism that is pre-configured within the delivery system. The deployment lines are预先 routed through the sleeve and attached to the frame structure before delivery, enabling automatic or controlled retraction of the sleeve after device deployment. This preliminary preparation ensures that the sleeve can be quickly and effectively retracted to eliminate overhang without requiring additional manual intervention or complex post-deployment adjustments.
2Difficulty of detecting and measuring
If conventional imaging technologies are used to monitor sleeve position, then imaging can be performed, but the technologies may not detect sleeves themselves or radiopaque markers do not reliably correlate to the ends of sleeves
Solution Approach 1:
The patent applies the color changes principle by incorporating radiopaque markers or imaging-visible features directly onto or within the delivery sleeve material. These features are strategically positioned to correlate with the actual ends and critical regions of the sleeve, enabling conventional imaging technologies to accurately detect and measure sleeve position and extent. This integration of visible markers transforms the previously invisible sleeve into an imageable structure, resolving the detection and measurement difficulties.
3Reliability
If the delivery sleeve is made longer to ensure complete coverage during delivery, then full device coverage is achieved, but greater overhang occurs after deployment affecting blood flow
Solution Approach 1:
The patent applies the dynamics principle by designing the delivery sleeve as a dynamic structure that changes its effective length and position during the deployment process. The sleeve transitions from a static covering during delivery to an actively retracted configuration after deployment. Through the retraction mechanism involving deployment lines and frame attachment, the sleeve dynamically adjusts its position to minimize overhang while maintaining complete device coverage during the critical delivery phase, thus eliminating the trade-off between coverage completeness and overhang reduction.
Data Source
AI summary
Through observation it has been determined that deployment of delivery sleeves may result in one or more portions of the deliver), sleeve extending beyond an end of the endoluminal device resulting in an overhang of material. The overhang may affect blood flow through the endoprosthesis or otherwise impact performance, including facilitating unwanted tissue growth. Various inventive concepts are provided for addressing (reducing or removing) constraining sheath overhang.