Magnetic Retrieval Components for Misaligned Implanted Devices
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Solution Overview
Problem
Current methods for retrieving implanted medical devices, such as IVC filters and stents, are challenging due to misalignment and require high operator skill, leading to prolonged procedures and increased risk, especially in automated systems.
Innovation Solution
Magnetic tipped wires, magnetic sheaths/catheters, and external magnets are used to locate, reposition, and retrieve medical devices by magnetically coupling with ferromagnetic components, allowing for precise alignment and retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical engagement methods (snares, forceps) are used to retrieve implanted devices, then retrieval can be performed with conventional tools, but alignment precision deteriorates when devices are misaligned or tilted
Solution Approach 1:
The patent replaces mechanical engagement methods (snares, forceps) with magnetic field-based manipulation. Magnetic components are integrated into the retrieval device to generate magnetic fields that interact with ferromagnetic materials in the implanted device, enabling alignment and retrieval without direct mechanical contact. This substitution eliminates the need for precise mechanical engagement while maintaining retrieval effectiveness.
2Productivity
If conventional mechanical retrieval tools are used, then device retrieval can be attempted, but procedure time increases when devices are misaligned or difficult to engage
Solution Approach 1:
The patent incorporates magnetic alignment features that automatically guide the retrieval device toward the implanted device before mechanical engagement is attempted. The magnetic field pre-aligns the components, ensuring that when mechanical engagement occurs, it is already in the correct position and orientation. This preliminary magnetic alignment action prevents failed engagement attempts and reduces overall procedure time.
3Extent of automation
If automated robotic systems are used for medical procedures, then automation level increases, but alignment capability deteriorates due to lack of operator expertise
Solution Approach 1:
The patent enables the robotic system to perform self-alignment through magnetic field interactions. The magnetic components in the robotic retrieval device automatically orient and position themselves relative to the implanted device without requiring complex sensor feedback or operator intervention for alignment. This self-aligning capability allows automated systems to achieve precision previously requiring expert operator skill.
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 magnetic devices improve alignment precision, reduce procedure time, and decrease the skill required for complex interventions, enhancing patient outcomes and reducing radiation exposure.
Implementation Method 1
at least one magnetic element disposed at a distal portion of the body... an external magnetic device configured to generate a magnetic field detectable within a body of a subject
Implementation Method 2
magnetically coupling the guidewire to the ferromagnetic component of implanted medical device
Implementation Method 3
applying an external magnetic field to influence the position or orientation of at least one of the catheter, the guidewire, or the implanted medical device
Data Source
AI summary
Provided herein are medical devices with magnetic components that allow for locating, repositioning, and/or retrieving medical devices within a subject. In particular, a magnetically-tipped wire and/or an external magnet are provided, for example, as components of system with other medical devices and/or for use in medical procedures, such as in the field of interventional radiology (IR).