Medical Snare With Capture And Threader Loops For Lead Retrieval
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Solution Overview
Problem
Existing medical snares lack precision in deploying and manipulating components for capturing medical devices like pacemaker and defibrillator leads, prolonging retrieval procedures without significantly improving patient outcomes.
Innovation Solution
The development of a snare with an outer sheath, an elongate member, a capture member with a throat region and perpendicular loop, and a threader member, allowing for precise capture and retrieval of medical devices through a handle with a plunger and control mechanism, enabling efficient navigation and retrieval within the body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing snare designs are used, then the retrieval procedure can be completed, but the precision in deployment and manipulation of components is insufficient
Solution Approach 1:
The snare is divided into distinct functional components: an outer sheath, an inner elongate member, a capture member with a loop, and a threader member with a loop. Each component can be independently deployed and manipulated through separate lumens, allowing precise control over the capture mechanism while maintaining efficient retrieval operations.
Solution Approach 2:
The capture member and threader member are designed to be axially movable within the elongate member lumen, enabling dynamic adjustment of their positions and configurations. This allows the loops to be deployed at precise locations and manipulated to capture devices accurately, while the entire assembly can be retracted efficiently for retrieval.
2Manufacturing precision
If existing snare designs are used, then retrieval can be performed, but the manipulation precision of capture components is inadequate
Solution Approach 1:
The capture member and threader member are nested within the elongate member, which itself is within the outer sheath. This nested arrangement allows each component to be independently positioned and manipulated through its own lumen while maintaining a compact structure, enhancing both precision of capture and ease of operation during retrieval.
Solution Approach 2:
The elongate member acts as an intermediary structure that contains and guides both the capture member and threader member. Its lumens provide controlled pathways for deploying and manipulating these components, enabling precise capture operations while simplifying the overall operation through a unified structural framework.
3Productivity
If existing snare designs are used, then medical devices can be retrieved, but the overall efficiency is reduced
Solution Approach 1:
The snare components are pre-configured within the outer sheath in a ready-to-deploy arrangement. The capture member and threader member can be quickly advanced through the elongate member lumens to their target positions before capture is needed, and the entire assembly can be rapidly retracted for removal, significantly reducing procedural time while maintaining high efficiency.
Data Source
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Figure 3A~4B
Figure 5A~6B
AI summary
Snares for retrieval of medical devices from the body of an animal, medical assemblies, kits, and methods of retrieving a medical device from the body of an animal are described. An example snare comprises an outer sheath defining an outer sheath lumen; an elongate member disposed in the outer sheath lumen and having a longitudinal axis and at least one elongate member lumen; a capture member disposed and axially movable within the at least one elongate member lumen, the capture member defining a capture loop having a throat region and a portion extending along a plane that is perpendicular to the longitudinal axis of the elongate member; and a threader member disposed and axially movable within the at least one elongate member lumen, the threader member defining a threader loop. A handle includes a rotatable control member for deflecting a distal end of the outer sheath.