Repositionable Endograft with Dynamic Retention Tines
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Solution Overview
Problem
Existing vascular endografts face challenges in achieving a secure seal in irregularly shaped anatomic spaces, often requiring balloon over-dilatation and are not repositionable, leading to high rates of open surgery for aneurysm treatment due to migration and leakage issues.
Innovation Solution
A sealable and repositionable endograft system with elastic proximal and distal ends, circumferential collars, and variable sealing devices that can adjust to fit irregular vessel shapes, along with retractable retention tines and a delivery catheter for precise deployment and post-deployment adaptation, allowing for manual adjustment to accommodate anatomical changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing endograft designs are used to achieve a secure seal, then sealing capability is improved, but the device cannot be repositioned or removed once deployed
Solution Approach 1:
The endograft incorporates a dynamic retention mechanism with movable tines that can transition between engaged and disengaged states. The tines are held in an engaged position during deployment to secure the graft, but can be retracted or disengaged to allow removal or repositioning if needed, providing both initial secure attachment and post-deployment flexibility.
Solution Approach 2:
The design allows for the temporary use of retention tines during deployment that can be discarded or deactivated after proper positioning is achieved. This enables the graft to be securely fixed during the critical sealing phase, then allows for potential removal or adjustment if complications arise, balancing reliability with operational flexibility.
2Reliability
If balloon over-dilatation is used to achieve a secure seal, then sealing capability is improved, but the native anatomy is distorted or altered
Solution Approach 1:
The endograft incorporates self-expanding properties through its memory alloy framework that automatically expands to the correct diameter upon deployment, achieving secure sealing without requiring external balloon over-dilatation. The graft self-adjusts to fit the native vessel anatomy, maintaining the natural geometry while ensuring adequate seal.
Solution Approach 2:
The design utilizes shape memory materials that change their physical parameters (shape, diameter) in response to temperature or stress changes during deployment. This allows the graft to transition from a compressed delivery state to an expanded functional state, achieving secure sealing through controlled parameter changes rather than forceful balloon dilation that would distort the anatomy.
3Reliability
If barbs or hooks are incorporated to prevent migration, then retention is improved, but the device cannot be removed or repositioned
Solution Approach 1:
The retention tines are designed as dynamic elements that can change their engagement state. During deployment, the tines extend to engage with the vessel wall for secure retention. However, the mechanism allows for controlled disengagement or retraction of these tines, enabling removal or repositioning of the endograft if clinical circumstances require it, thus providing both retention and removability.
4Ease of manufacture
If a fixed diameter collar is used to achieve seal, then manufacturing simplicity is improved, but adaptability to irregular vessel shapes is reduced
Solution Approach 1:
The collar incorporates variable diameter capabilities through an expandable framework that can adjust its circumference. The collar starts in a compressed state for easy delivery, then expands to accommodate the specific vessel diameter at the deployment site. This dynamic adjustment allows the same collar design to adapt to various vessel sizes and irregular shapes while maintaining manufacturability.
Solution Approach 2:
The collar design utilizes materials and mechanisms that allow its diameter parameter to change during deployment. The collar can be manufactured at a standard size but will expand or contract to match the native vessel geometry, achieving adaptability to irregular shapes through controlled parameter changes rather than requiring custom-manufactured collars for each anatomical variation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides a secure seal without altering the anatomy, reduces the need for balloon over-dilatation, and allows for repositioning and post-deployment adjustments, enhancing the efficacy of endovascular treatments by minimizing complications and morbidity.
Implementation Method 1
an endograft implant comprises a non-elastic tubular implant body with an elastic proximal ends and an elastic distal end(s)
Data Source
AI summary
A method of implanting a prosthetic medical device at a target implantation site is provided. The method first comprises advancing a first prosthetic medical device through a subject's vasculature to a target implantation site. The first prosthetic medical device comprises a coil having an inflow end portion, an outflow end portion, and a central longitudinal axis extending from the inflow end portion to the outflow end portion. The method further comprises expanding the first prosthetic medical device from a compressed state to an expanded state to engage native vascular tissue at the target implantation site. The method subsequently comprises docking a second prosthetic medical device within the first prosthetic medical device.