Wire Weave Retrieval End for Endovascular Device Capture
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Solution Overview
Problem
Current catheter-based technologies lack the capability to safely and effectively retrieve endovascular devices such as stents or valve prostheses from a subject's body, particularly in cases of misplacement or dislodgement, which can lead to complications requiring emergency surgery.
Innovation Solution
A percutaneous retrieval system comprising an outer sheath and an inner sheath with a distal retrieval end that transitions between compressed and expanded states, allowing for the capture and compression of endovascular devices within the subject's internal body space, utilizing a wire weave structure to transform linear pulling force into radial compressive force for secure removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional catheter-based technologies are used, then device delivery and implantation can be performed, but device retrieval capability is lacking, requiring emergency surgery for removal
Solution Approach 1:
The retrieval device employs a nested structure where an inner sheath containing a retrieval end is inserted within an outer sheath. The retrieval end can be deployed from the inner sheath to capture the misplaced device, and the entire assembly is then withdrawn through the outer sheath. This nested configuration enables retrieval capability while maintaining a manageable system structure that builds functionality incrementally.
Solution Approach 2:
The retrieval system is divided into distinct functional segments: the outer sheath for delivery and protection, the inner sheath for housing the retrieval mechanism, and the retrieval end for actual device capture. This segmentation allows each component to be optimized independently and simplifies the overall system by assigning specific functions to specific parts.
2Ease of operation
If the retrieval end is deployed in expanded state to capture the object, then capture capability is improved, but the retrieval end cannot be withdrawn through the outer sheath lumen
Solution Approach 1:
The retrieval end is designed as a dynamic structure that can transition between an expanded state for capturing objects and a compressed state for withdrawal. The wire weave construction allows the retrieval end to expand when deployed to grasp the misplaced device and then compress when withdrawn through the outer sheath lumen, enabling both capture capability and withdrawability.
Solution Approach 2:
The retrieval end utilizes changes in its physical parameters, specifically its diameter, to perform different functions. When deployed, it expands to a larger diameter to effectively capture and enclose the object. When withdrawal is required, it compresses to a smaller diameter to pass through the outer sheath lumen. This parameter transformation is achieved through the wire weave structure that responds to applied forces.
3Length of moving object
If the retrieval end is made collapsible to fit within outer sheath lumen, then withdrawability is improved, but capture effectiveness may be reduced
Solution Approach 1:
The retrieval end's collapsibility is implemented through its wire weave construction, which allows it to dynamically change its diameter. The structure maintains its shape and expansion capability when forces are applied to capture objects, but can be compressed when withdrawal is needed. This dynamic behavior ensures both effective capture and successful withdrawal without compromising either function.
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
Enables safe and controlled retrieval of endovascular devices, reducing the need for emergency surgery by allowing for the capture, enclosure, and partial collapse of devices, thereby facilitating their removal from the body through a catheter-based approach.
Implementation Method 1
utilizing a wire weave structure to transform linear pulling force into radial compressive force for secure removal
Implementation Method 2
the retrieval end exerts an inward force that at least partially collapses or compresses the object
Data Source
AI summary
Disclosed are systems, methods, and devices for percutaneous retrieval of objects, such as endovascular devices, from an internal body space. The present inventions have vascular, non-vascular (gastrointestinal), and surgical (laproscopic) applications. The inventions include a a wire woven distal end that is formed from wires and includes a substantially cylindrical main body section comprising a leading end, a trailing end, and a middle portion extending between the leading end and the trailing end and defining a longitudinal axis of the main body section, and a flare defining a mouth of the wire woven distal end that projects circumferentially from the leading end of the main body section, wherein when at least a portion of the retrieval end is transitioned to a compressed state following capture of an object, the retrieval end exerts an inward force that at least partially collapses or compresses the object.